# Patent

## Title
Low polyunsaturated fatty acid oils and uses thereof

## Abstract

Provided are microalgal oils having a low polyunsaturated fatty acid profile and derivatives of the oils, including acids, esters, epoxides, hydroxylated acids and esters, urethanes, amides, and polymers thereof. Also provided are compositions comprising the oils and their derivatives and their uses in foodstuffs and in industrial and material applications. The compositions include flexible polyurethane foams prepared from the microalgal oils.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Patent Application Nos.: 61/816,648, filed Apr. 26, 2013; 61/831,571, filed Jun. 5, 2013; 61/887,278, filed Oct. 4, 2013; and 61/942,524, filed Feb. 20, 2014. Each of these applications is incorporated herein by reference in its entirety for all purposes.


REFERENCE TO A SEQUENCE LISTING
This application includes an electronic sequence listing in a file named “445247-Substitute-Sequence.txt”, creanted on Aug. 11, 2014 and containing 342,709 bytes, which is hereby incorporated by reference in its entirety for all purposes.
FIELD
Embodiments of the present invention relate to oils/fats, fuels, foods, and oleochemicals and their production from cultures of genetically engineered cells. Specific embodiments relate to oils with a high content of triglycerides bearing fatty acyl groups upon the glycerol backbone in particular regiospecific patterns, highly stable oils, oils with high levels of oleic or mid-chain fatty acids, and products produced from such oils.
BACKGROUND
Polyunsaturated fatty acids (PUFAs) are often present in sizable amounts in high oleic oils and high oleic oil derivatives that are used in foodstuffs and as oleochemicals in industrial and material applications. Many of these oils are obtained from plants and plant seeds, where PUFAs serve as important metabolic compounds necessary for growth and survival. The table below shows the approximate fatty acid content of major commercial vegetable oils having a high oleic acid variety.















Oil
C18:1
PUFAs









Soybean Oil
30%
60%



High Oleic Soybean Oil
75%
13%



Canola Oil
60%
35%



High Oleic Canola Oil
70%
15%



Mid Oleic Sunflower Oil
65%
25%



High Oleic Sunflower Oil
80%
10%



Safflower Oil
15%
75%



High Oleic Safflower Oil
75%
15%










Soybean, canola, and safflower oils show considerable amounts of PUFAs, and their high oleic versions still show appreciable amounts of PUFAs. Purification of the oils to remove the PUFAs is difficult and costly and thus not feasible on a commercial scale.
Unlike oleic acid which contains a single double bond, PUFAs contain more than one double bond in a fatty acid chain. This increase in unsaturation causes the PUFAs to be susceptible to autoxidation, polymerization, and other chemical reactions. Particularly when exposed to heat, light, and oxidative conditions, the increased reactivity of the PUFAs leads to unwanted side products that contaminate the oil. In foodstuffs such side products can negatively affect taste and smell. As oleochemicals in industrial and material applications, the side products can result in a decrease in the stability and desired performance characteristics of the oleochemical or material.
SUMMARY OF THE DISCLOSURE
The present invention provides, in one aspect, microalgal oils having a low polyunsaturated fatty acid profile. The fatty acid profile can further contain a high oleic or high midchain content. The oils can be used as starting materials for the preparation of derivatives such as but not limited to acids, esters, epoxides, hydroxylated acids and esters, urethanes, amides, and polymers thereof, including polyesters, polyurethanes, and polyamides. In some aspects, the oils and their derivatives find use in foodstuffs and in industrial and material applications.
In one aspect, the present invention provides a composition comprising a microalgal oil, wherein the composition is selected from the group consisting of a spray oil, a heat transfer fluid, a release agent, and a hydraulic fluid, the microalgal oil having a fatty acid profile of at least 70% oleic acid and less than 7% polyunsaturated fatty acids.
In some cases, the spray oil is applied to human or animal food. In some cases, the food is fruit, dried fruit, vegetable, dried vegetable, baked product, nuts, candy, or seeds.
In some cases, the release agent optionally comprises one or more of an antioxidant, a metal chelator, an oxygen scavenger, an anti-microbial agent, a lubricating additive, or a high viscosity petroleum hydrocarbon oil. In some cases, the release agent is for releasing concrete, food, paper, plastics, or rubber from a mold.
In some cases, the heat transfer fluid optionally comprises one or more of an antioxidant, a metal chelator, an oxygen scavenger, an anti-microbial agent, a pour point depressant, a moisture scavenger, or a colorant. In some cases, the heat transfer fluid is a dielectric fluid. In some cases, the heat transfer fluid is a computer coolant fluid.
In some cases, the hydraulic fluid optionally comprises one or more of an antioxidant, a metal chelator, an anti-corrosion agent, a wear protection agent, or an anti-foaming agent. In some cases, the hydraulic fluid optionally comprises a phosphate ester. In some cases, the phosphate ester is an alkyl phosphate ester, an aryl phosphate ester, or a mixed alkyl/aryl phosphate ester. In some cases, the phosphate ester is tributyl phosphate, dibutyl phenyl phosphate, tris-iso-propylphenyl phosphate, tris-tert-butylphosphate, dioctyl phenyl phosphate, and octyl diphenyl phosphate. In some cases, the hydraulic fluid is an elevator hydraulic fluid, a construction equipment hydraulic fluid, or a fire resistant hydraulic fluid. In a preferred embodiment, the hydraulic fluid is an elevator hydraulic fluid. In some cases, the hydraulic fluid is used in an aircraft, a steel mill, a die casting machine, a hydroelectric turbine, a hydraulic press, or a compressor.
In any of the foregoing compositions, the fatty acid profile has at least 75%, 80%, or 85% oleic acid. In some cases, the fatty acid profile has less than 6%, 5%, 4%, 3%, 2%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the present invention provides a lubricant comprising a microalgal oil and optionally one or more of an antioxidant, a corrosion inhibitor, a metal deactivator, a lubricity additive, a viscosity index improver, a pour point depressant, an anti-foaming agent, an anti-wear agent, or an extreme pressure resistance additive, and the microalgal oil has a fatty acid profile of at least 70% oleic acid and less than 7% polyunsaturated fatty acids. In some cases, the lubricant is a railroad lubricant, food grade lubricant, gear lubricant, metal working fluid, textile lubricant, combustion engine lubricant, or an electric motor lubricant. In some cases, the microalgal oil of the lubricant has a fatty acid profile of at least 75%, 80%, or 85% oleic acid. In some cases, the fatty acid profile has less than 6%, 5%, 4%, 3%, 2%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the present invention provides a surfactant comprising a microalgal oil and optionally one or more of a quaternary amine, an alkyl polyglycoside, a betaine, a sulfosuccinate, an ethyl ester sulfonate, or a methyl ester sulfonate, and the microalgal oil has a fatty acid profile of at least 70% oleic acid and less than 7% polyunsaturated fatty acids. In some cases, the fatty acid profile has at least 75%, 80%, or 85% oleic acid. In some cases, the fatty acid profile has less than 6%, 5%, 4%, 3%, 2%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the present invention provides a personal care product comprising a microalgal oil, in which the microalgal oil has a fatty acid profile of at least 70% oleic acid and less than 7% polyunsaturated fatty acids. In some cases, the fatty acid profile has at least 75%, 80%, or 85% oleic acid. In some cases, the fatty acid profile has less than 6%, 5%, 4%, 3%, 2%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the present invention provides a composition comprising a derivative of a triacylglyceride, wherein the triacylglyceride is obtained from a microalgal oil having a fatty acid profile of at least 70% oleic acid and less than 7% polyunsaturated fatty acids. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In some cases, the derivative has a hydroxyl substituted fatty acid moiety or ester thereof. In some cases, the derivative has a urethane substituted fatty acid moiety or ester thereof. In some cases, the derivative is a polyurethane. In some cases, the derivative has an epoxide substituted fatty acid moiety or ester thereof. In some cases, the epoxidized oleic acid is polymerized and the composition is a coating. In some cases, the derivative has an ethoxylated fatty acid moiety, a sulfonated fatty acid moiety, or a sulfated fatty acid moiety. In some cases, the derivative is a C36 dimer acid, an alkenyl cross metathesis product, an estolide, azalaic acid, or pelergonic acid. In some cases, the azelaic acid or pelergonic acid is prepared by performing ozonolysis of the microalgal oil. In some cases, the derivative is an oleic ester, wherein the ester is a methyl, ethyl, butyl, tert-butyl, propyl, iso-propyl, or an (ethyl)hexyl ester. In some cases, the derivative is an anhydride ester.
In another aspect, the present invention provides a solvent comprising an oleic acid ester prepared from a microalgal oil having a fatty acid profile of at least 70% oleic acids and less than 1% polyunsaturated acids. In some cases, the ester is a methyl, ethyl, butyl, tert-butyl, propyl, iso-propyl, or an (ethyl)hexyl ester. In some cases, the microalgal oil has a fatty acid profile of at least 75%, 80%, or 85% oleic fatty acids. In some cases, the microalgal oil has less than 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids. In some cases, the solvent has a VOC (volatile organic compound) as measured by EPA method 24 of less than 20%, a Kauri Butanol value as measured by ASTM D1133 of greater than 50%, a kinematic viscosity at 40° C. of less than 5 centistokes, and a flash point of greater than 100° C. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the present invention provides a cleaning formulation comprising a solvent as discussed above, and an emulsifier, a non-ionic surfactant, and water. In some cases, the emulsifier is Videt ME 80. In some cases, the non-ionic surfactant is Stephan BioSoft N91-8. In some cases, the water is deionized. In some cases, the cleaning formulation further comprises limonene, methyl soyate, or methyl ricinoleate. In some cases, the microalgal oil comprises one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol; and the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In another aspect, the solvents provided herein are used as a printing ink remover, oil rig and mud wash, industrial parts washer, paint and adhesive remover, and/or as a waterless hand cleaner.
In another aspect, the present invention provides a cross-linkable or cross-linked rubber composition, the composition comprising per one hundred parts by weight of rubber (phr): one or more diene elastomers; from 5 phr to 35 phr of at least one hydrocarbon plasticizing resin having a glass transition temperature (Tg) of between 10° C. to 150° C. and an average molecular weight of between 400 g/mol and 2000 g/mol; and from 5 phr to 60 phr of an oleaginous microbial oil.
In some cases, the rubber composition further comprises a reinforcing filler. In some cases, the reinforcing filler comprises an inorganic filler, carbon black, or a blend thereof. In some cases, the inorganic filler is silica. In some cases, the reinforcing filler is in an amount from 40 to 200 phr.
In some cases, the diene elastomer comprises from 25 to 100 phr of a majority diene elastomer and from 0 to 75 phr of a minority diene elastomer. In some cases, the majority diene elastomer is selected from the group consisting of a copolymer of styrene and butadiene prepared in solution, copolymer of styrene and butadiene prepared in emulsion, copolymer of styrene, and isopropene prepared in solution, terpolymer of styrene, butadiene, and isopropene prepared in solution, natural polyisoprenes, synthetic polyisoprenes having a cis-1,4 linkage content greater than 95%, and mixtures thereof, and the minority diene elastomer is selected from a polybutadiene having a cis-1,4 linkage content greater than 90%. In some cases, the majority diene elastomer has a Tg of from −65° C. to −10° C. and the minority diene elastomer has a Tg of from −110° C. to −75° C. In some cases, the majority diene elastomer is a copolymer of styrene and butadiene prepared in solution. In some cases, the majority diene elastomer has a glass transition temperature of from −50° C. to −15° C. and greater than 50% trans-1,4 butadiene linkage content. In some cases, the majority diene elastomer is a copolymer of styrene and butadiene prepared in emulsion. In some cases, the majority diene elastomer copolymer has a glass transition temperature of from −55° C. to −30° C.
In some cases, the hydrocarbon plasticizing resin has a glass transition temperature of from 30° C. to 120° C., a number-average molecular weight of between 400 and 1000 g/mol, and a polymolecularity index less than 2. In some cases, the resin is comprised of units resulting from the polymerization of a monocyclic or bicyclic unsaturated terpene. In some cases, the resin has a glass transition temperature of from 60° C. to 100° C. In some cases, the unsaturated terpene is a monocyclic unsaturated terpene, which in some cases is limonene or dipentene.
In some cases, the resin further comprises one or more units resulting from at least one hydrocarbon monomer selected from the group consisting of bicyclic unsaturated terpenes, monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, cyclic dienes and conjugated dienes. In some cases, the at least one hydrocarbon monomer is selected from the group consisting of α-pinene, styrene, alkyl styrene, dicyclopentadiene and isoprene. In some cases, the resin comprises units resulting from the polymerization of vinylcyclohexene. In some cases, the resin further comprises one or more other units at least one of which has resulted from the polymerization of a hydrocarbon selected from the group consisting of monocyclic unsaturated terpenes, bicyclic unsaturated terpenes, monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, cyclic dienes and conjugated dienes.
In some cases, the rubber composition further comprises from 0 phr to 30 phr of one or more plasticizing oils extracted from petroleum of paraffinic, aromatic or naphthenic type. In some cases, the rubber composition is devoid of plasticizing oil extracted from petroleum. In some cases, the rubber composition comprises from 10 phr to 25 phr of the hydrocarbon plasticizing resin, and from 15 phr to 30 phr of the plasticizing oil extracted from petroleum.
In some cases, the microbial oil is a microalgal oil comprising C29 and C28 sterols, wherein the amount of C28 sterols is greater than C29 sterols.
In some cases, the microbial oil is a microalgal oil comprising one or more of: at least 10% ergosterol; ergosterol and β-sitosterol, wherein the ratio of ergosterol to β-sitosterol is greater than 25:1; ergosterol and brassicasterol; ergosterol, brassicasterol, and poriferasterol, and wherein the oil is optionally free from one or more of β-sitosterol, campesterol, and stigmasterol.
In some cases, the microbial oil is a microalgal oil obtained from heterotrophic oleaginous microalgae. In some cases, the microalgal oil is obtained from microalgae cultivated with sugar from corn, sorghum, sugar cane, sugar beet, or molasses as a carbon source. In some cases, the microalgal oil is obtained from microalgae cultivated on sucrose.
In some cases, the microalgae are Parachlorella, Prototheca, or Chlorella. In some cases, the microalgae are Prototheca moriformis. 
In some cases, the microalgal oil is obtained from recombinant heterotrophic oleaginous microalgae. In some cases, the microalgal oil has a fatty acid profile having at least 75%, 80%, or 85% oleic acid. In some cases, the microalgal oil has a fatty acid profile of at least 50% combined total amount of C10, C12, and C14. In some cases, the microalgal oil has a fatty acid profile having less than 6%, 5%, 4%, 3%, 2%, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0.05%, or 0.01% polyunsaturated fatty acids.
In another aspect, the present invention provides a tire tread comprising a rubber composition as discussed above or herein.
In another aspect, the present invention provides a tire comprising a tire tread as discussed above.
These and other aspects and embodiments of the invention are described and/or exemplified in the accompanying drawings, a brief description of which immediately follows, the detailed description of the invention, and in the examples. Any or all of the features discussed above and throughout the application can be combined in various embodiments of the present invention.



BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-14 show fatty acid profiles and melting curves of refined, bleached and deodorized oils from genetically engineered Prototheca moriformis strains, as discussed in Example 4;
FIG. 15 shows the stability of different oils as a function of antioxidant concentration, as discussed in Example 5;
FIG. 16 shows various properties of natural oils with very low levels of polyunsaturated fatty acids in accordance with an embodiment of the invention; and
FIG. 17 shows a plot of percent solid fat content for various oils as follows: (a) P. moriformis RBD oil without lipid pathway engineering; (b) Brazilian cocoa butter +25% milk fat; (c) three replicates of P. moriformis RBD oil from a strain expressing hairpin nucleic acids that reduce levels of a SAD allele thus reducing oleic acid and increasing stearic acid in the TAG profile; (d) P. moriformis RBD oil from a strain overexpressing an endogenous OTE (oleoyl acyl-ACP thioesterase, see Example 45); (e) Malaysian cocoa butter +25% milk fat; and (f) Malaysian cocoa butter. The cocoa butter and cocoa butter milk fat values are literature values (Bailey's Industrial Oils and Fat Products, 6th ed.).
FIG. 18 shows the results of thermal stability testing performed on methylated oil prepared from high-oleic (HO) and high-stability high-oleic (HSAO) triglyceride oils prepared from heterotrophically grown oleaginous microalgae, in comparison to a soya methyl ester control sample.
FIG. 19 shows various properties of high-oleic and high-stability high-oleic algal oils.
FIG. 20 shows TAG composition of strain K-4, strain AU and strain AV oils from flask and fermenter biomass. La=laurate (C12:0), M=myristate (C14:0), P=palmitate (C16:0), Po=palmitoleate (C16:1), S=stearate (C18:0), O=oleate (C18:1), L=linoleate (C18:2), Ln=α-linolenate (C18:3), A=arachidate (C20:0), B=behenate (C22:0), Lg=lignocerate (C24:0), Hx=hexacosanoate (C26:0) S—S—S refers to the sum of TAGs in which all three fatty acids are saturated. In each block of bars, the strains are shown in the order illustrated at the bottom of the figure.
FIG. 21 shows TAG composition of strain AW, strain AX and strain AY oils from shake flask biomass. La=laurate (C12:0), M=myristate (C14:0), P=palmitate (C16:0), Po =palmitoleate (C16:1), S=stearate (C18:0), O=oleate (C18:1), L=linoleate (C18:2), Ln=α-linolenate (C18:3), A=arachidate (C20:0), B=behenate (C22:0), Lg=lignocerate (C24:0), Hx=hexacosanoate (C26:0). S—S—S refers to the sum of TAGs in which all three fatty acids are saturated. In each block of bars, the strains are shown in the order illustrated at the bottom of the figure.
FIG. 22 shows the fatty acid profile and solid fat content of a refined, bleached and deodorized myristate rich oil from a genetically engineered Prototheca moriformis strain as discussed in Example 52.
FIG. 23 shows the pairwise alignment of heterologous FAE proteins expressed in STRAIN Z.
FIG. 24 shows percentage of VOC (volatile organic compounds) as measured by EPA Method 24. Fatty acid methyl ester prepared from a high oleic triacylglyceride of example 49 was found to have 0.13 g/g (13%) VOC as compared to 0.95 g/g for limonene and greater than 0.95 g/g for mineral spirits and tolulene.
FIG. 25 shows the density results of the foams of Example 64.
FIG. 26 shows the resilience results of the foams of Example 64.
FIG. 27 shows the tensile strength results of the foams of Example 64.
FIG. 28 shows the elongation results of the foams of Example 64.
FIG. 29 shows the compression force deflection results of the foams of Example 64.
FIG. 30 shows the compression set results of the foams of Example 64.
FIG. 31 shows the hysteresis loss results of the foams of Example 64.



DETAILED DESCRIPTION
I. Definitions
An “allele” is any of one or more alternative forms of a gene which relate to one trait or characteristic.
“Antioxidant” refers to a molecule that is capable of inhibiting the oxidation of other molecules. Antioxidants are frequently added to industrial products. A common use is as stabilizers in fuels and lubricants to prevent oxidation, and in gasolines to prevent the polymerization that leads to the formation of engine-fouling residues. They are also widely used to prevent the oxidative degradation of polymers such as rubbers, plastics and adhesives that causes a loss of strength and flexibility in these materials.
“Anti-hydrolysis compound” refers to a molecule that inhibits the decomposition of a chemical compound by reaction with water. Carbodiimides, for example, can be employed as anti-hydrolysis compounds. Anti-hydrolysis compounds are commercially available, e.g., from SpecialChem, among others.
“Anti-wear additive” refers to an additive to a fluid (e.g., a lubricating oil) that results in longer machine life due to higher wear and score resistance of the components. Anti-wear additives prevent direct metal-to-metal contact between the machine parts when the oil film is broken down. Typically, the additive reacts with the metal on the part surface and forms a film, which may slide over the friction surface. Anti-wear additives typically contain zinc and phosphorus compounds. Examples of anti-wear additives include zinc dithiophosphate (ZDP), zinc dialkyl dithio phosphate (ZDDP, also acts as a corrosion inhibitor and antioxidant), tricresyl phosphate (TCP, used for high-temperature operation), halocarbons (chlorinated paraffins, for extreme pressure operations), glycerol mono-oleate, stearic acid (which adheres to surfaces via reversible adsorption process under 150° C., useful for mild contact conditions.
A “natural oil” or “natural fat” shall mean a predominantly triglyceride oil obtained from an organism, where the oil has not undergone blending with another natural or synthetic oil, or fractionation so as to substantially alter the fatty acid profile of the triglyceride. In connection with an oil comprising triglycerides of a particular regiospecificity, the natural oil or natural fat has not been subjected to interesterification or other synthetic process to obtain that regiospecific triglyceride profile, rather the regiospecificity is produced naturally, by a cell or population of cells. In connection with a natural oil or natural fat, and as used generally throughout the present disclosure, the terms oil and fat are used interchangeably, except where otherwise noted. Thus, an “oil” or a “fat” can be liquid, solid, or partially solid at room temperature, depending on the makeup of the substance and other conditions. Here, the term “fractionation” means removing material from the oil in a way that changes its fatty acid profile relative to the profile produced by the organism, however accomplished. The terms “natural oil” and “natural fat” encompass such oils obtained from an organism, where the oil has undergone minimal processing, including refining, bleaching and/or degumming, that does not substantially change its triglyceride profile. A natural oil can also be a “noninteresterified natural oil”, which means that the natural oil has not undergone a process in which fatty acids have been redistributed in their acyl linkages to glycerol and remain essentially in the same configuration as when recovered from the organism.
“Exogenous gene” shall mean a nucleic acid that codes for the expression of an RNA and/or protein that has been introduced into a cell (e.g. by transformation/transfection), and is also referred to as a “transgene”. A cell comprising an exogenous gene may be referred to as a recombinant cell, into which additional exogenous gene(s) may be introduced. The exogenous gene may be from a different species (and so heterologous), or from the same species (and so homologous), relative to the cell being transformed. Thus, an exogenous gene can include a homologous gene that occupies a different location in the genome of the cell or is under different control, relative to the endogenous copy of the gene. An exogenous gene may be present in more than one copy in the cell. An exogenous gene may be maintained in a cell as an insertion into the genome (nuclear or plastid) or as an episomal molecule.
“Fatty acids” shall mean free fatty acids, fatty acid salts, or fatty acyl moieties in a glycerolipid. It will be understood that fatty acyl groups of glycerolipids can be described in terms of the carboxylic acid or anion of a carboxylic acid that is produced when the triglyceride is hydrolyzed or saponified.
“Fixed carbon source” is a molecule(s) containing carbon, typically an organic molecule that is present at ambient temperature and pressure in solid or liquid form in a culture media that can be utilized by a microorganism cultured therein. Accordingly, carbon dioxide is not a fixed carbon source.
“In operable linkage” is a functional linkage between two nucleic acid sequences, such a control sequence (typically a promoter) and the linked sequence (typically a sequence that encodes a protein, also called a coding sequence). A promoter is in operable linkage with an exogenous gene if it can mediate transcription of the gene.
“Microalgae” are eukaryotic microbial organisms that contain a chloroplast or other plastid, and optionally that is capable of performing photosynthesis, or a prokaryotic microbial organism capable of performing photosynthesis. Microalgae include obligate photoautotrophs, which cannot metabolize a fixed carbon source as energy, as well as heterotrophs, which can live solely off of a fixed carbon source. Microalgae include unicellular organisms that separate from sister cells shortly after cell division, such as Chlamydomonas, as well as microbes such as, for example, Volvox, which is a simple multicellular photosynthetic microbe of two distinct cell types. Microalgae include cells such as Chlorella, Dunaliella, and Prototheca. Microalgae also include other microbial photosynthetic organisms that exhibit cell-cell adhesion, such as Agmenellum, Anabaena, and Pyrobotrys. Microalgae also include obligate heterotrophic microorganisms that have lost the ability to perform photosynthesis, such as certain dinoflagellate algae species and species of the genus Prototheca. 
In connection with a recombinant cell, the term knockdown refers to a gene that has been partially suppressed (e.g., by about 1-95%) in terms of the production or activity of a protein encoded by the gene.
Also, in connection with a recombinant cell, the term knockout refers to a gene that has been completely or nearly completely (e.g., >95%) suppressed in terms of the production or activity of a protein encoded by the gene. Knockouts can be prepared by homologous recombination of a noncoding sequence into a coding sequence, gene deletion, mutation or other method.
An “oleaginous” cell is a cell capable of producing at least 20% lipid by dry cell weight, naturally or through recombinant or classical strain improvement. An “oleaginous microbe” or “oleaginous microorganism” is a microbe, including a microalga that is oleaginous. An oleaginous cell also encompasses a cell that has had some or all of its lipid or other content removed, and both live and dead cells.
An “ordered oil” or “ordered fat” is one that forms crystals that are primarily of a given polymorphic structure. For example, an ordered oil or ordered fat can have crystals that are greater than 50%, 60%, 70%, 80%, or 90% of the β or β′ polymorphic form.
In connection with a natural oil, a “profile” is the distribution of particular species or triglycerides or fatty acyl groups within the oil. A “fatty acid profile” is the distribution of fatty acyl groups in the triglycerides of the oil without reference to attachment to a glycerol backbone. Fatty acid profiles are typically determined by conversion to a fatty acid methyl ester (FAME), followed by gas chromatography (GC) analysis with flame ionization detection (FID) as in Example 1. The fatty acid profile can be expressed as one or more percent of a fatty acid in the total fatty acid signal determined from the area under the curve for that fatty acid. FAME-GC-FID measurement approximate weight percentages of the fatty acids. A “sn-2 profile” is the distribution of fatty acids found at the sn-2 position of the triacylglycerides in the oil. A “regiospecific profile” is the distribution of triglycerides with reference to the positioning of acyl group attachment to the glycerol backbone without reference to stereospecificity. In other words, a regiospecific profile describes acyl group attachment at sn-1/3 vs. sn-2. Thus, in a regiospecific profile, POS (palmitate-oleate-stearate) and SOP (stearate-oleate-palmitate) are treated identically. A “stereospecific profile” describes the attachment of acyl groups at sn-1, sn-2 and sn-3. Unless otherwise indicated, triglycerides such as SOP and POS are to be considered equivalent. A “TAG profile” is the distribution of fatty acids found in the triglycerides with reference to connection to the glycerol backbone, but without reference to the regiospecific nature of the connections. Thus, in a TAG profile, the percent of SSO in the oil is the sum of SSO and SOS, while in a regiospecific profile, the percent of SSO is calculated without inclusion of SOS species in the oil. In contrast to the weight percentages of the FAME-GC-FID analysis, triglyceride percentages are typically given as mole percentages; that is the percent of a given TAG molecule in a TAG mixture.
The term “percent sequence identity,” in the context of two or more amino acid or nucleic acid sequences, refers to two or more sequences or subsequences that are the same or have a specified percentage of amino acid residues or nucleotides that are the same, when compared and aligned for maximum correspondence, as measured using a sequence comparison algorithm or by visual inspection. For sequence comparison to determine percent nucleotide or amino acid identity, typically one sequence acts as a reference sequence, to which test sequences are compared. When using a sequence comparison algorithm, test and reference sequences are input into a computer, subsequence coordinates are designated, if necessary, and sequence algorithm program parameters are designated. The sequence comparison algorithm then calculates the percent sequence identity for the test sequence(s) relative to the reference sequence, based on the designated program parameters. Optimal alignment of sequences for comparison can be conducted using the NCBI BLAST software (ncbi.nlm.nih.gov/BLAST/) set to default parameters. For example, to compare two nucleic acid sequences, one may use blastn with the “BLAST 2 Sequences” tool Version 2.0.12 (Apr. 21, 2000) set at the following default parameters: Matrix: BLOSUM62; Reward for match: 1; Penalty for mismatch: −2; Open Gap: 5 and Extension Gap: 2 penalties; Gap×drop-off: 50; Expect: 10; Word Size: 11; Filter: on. For a pairwise comparison of two amino acid sequences, one may use the “BLAST 2 Sequences” tool Version 2.0.12 (Apr. 21, 2000) with blastp set, for example, at the following default parameters: Matrix: BLOSUM62; Open Gap: 11 and Extension Gap: 1 penalties; Gap×drop-off 50; Expect: 10; Word Size: 3; Filter: on.
“Recombinant” is a cell, nucleic acid, protein or vector that has been modified due to the introduction of an exogenous nucleic acid or the alteration of a native nucleic acid. Thus, e.g., recombinant cells can express genes that are not found within the native (non-recombinant) form of the cell or express native genes differently than those genes are expressed by a non-recombinant cell. Recombinant cells can, without limitation, include recombinant nucleic acids that encode for a gene product or for suppression elements such as mutations, knockouts, antisense, interfering RNA (RNAi) or dsRNA that reduce the levels of active gene product in a cell. A “recombinant nucleic acid” is a nucleic acid originally formed in vitro, in general, by the manipulation of nucleic acid, e.g., using polymerases, ligases, exonucleases, and endonucleases, using chemical synthesis, or otherwise is in a form not normally found in nature. Recombinant nucleic acids may be produced, for example, to place two or more nucleic acids in operable linkage. Thus, an isolated nucleic acid or an expression vector formed in vitro by ligating DNA molecules that are not normally joined in nature, are both considered recombinant for the purposes of this invention. Once a recombinant nucleic acid is made and introduced into a host cell or organism, it may replicate using the in vivo cellular machinery of the host cell; however, such nucleic acids, once produced recombinantly, although subsequently replicated intracellularly, are still considered recombinant for purposes of this invention. Similarly, a “recombinant protein” is a protein made using recombinant techniques, i.e., through the expression of a recombinant nucleic acid.
The terms “triglyceride”, “triacylglyceride” and “TAG” are used interchangeably as is known in the art.
II. General
Illustrative embodiments of the present invention feature oleaginous cells that produce altered fatty acid profiles and/or altered regiospecific distribution of fatty acids in glycerolipids, and products produced from the cells. Examples of oleaginous cells include microbial cells having a type II fatty acid biosynthetic pathway, including plastidic oleaginous cells such as those of oleaginous algae. Specific examples of cells include heterotrophic or obligate heterotrophic microalgae of the phylum Chlorophtya, the class Trebouxiophytae, the order Chlorellales, or the family Chlorellacae. Examples of oleaginous microalgae and methods of cultivation are also provided in Published PCT Patent Applications WO2008/151149, WO2010/06032, WO2011/150410, WO2011/150411, WO2012/061647, and WO2012/106560, including species of Chlorella and Prototheca, a genus comprising obligate heterotrophs. The oleaginous cells can be, for example, capable of producing 25, 30, 40, 50, 60, 70, 80, 85, or about 90% oil by cell weight, ±5%. Optionally, the oils produced can be low in highly unsaturated fatty acids such as DHA or EPA fatty acids. For example, the oils can comprise less than 5%, 2%, or 1% DHA and/or EPA. In some cases, the microalgal oils have a high oleic and low polyunsaturated fatty acid profile and derivatives of the oils, including acids, esters, epoxides, hydroxylated acids and esters, urethanes, amides, and polymers can be prepared with the same attributes for use in foodstuffs and in industrial and material applications. The above-mentioned publications also disclose methods for cultivating such cells and extracting oil, especially from microalgal cells; such methods are applicable to the cells disclosed herein and incorporated by reference for these teachings. When microalgal cells are used they can be cultivated autotrophically (unless an obligate heterotroph) or in the dark using a sugar (e.g., glucose, fructose and/or sucrose) In any of the embodiments described herein, the cells can be heterotrophic cells comprising an exogenous invertase gene so as to allow the cells to produce oil from a sucrose feedstock. Alternately, or in addition, the cells can metabolize xylose from cellulosic feedstocks. For example, the cells can be genetically engineered to express one or more xylose metabolism genes such as those encoding an active xylose transporter, a xylulose-5-phosphate transporter, a xylose isomerase, a xylulokinase, a xylitol dehydrogenase and a xylose reductase. See WO2012/154626, “GENETICALLY ENGINEERED MICROORGANISMS THAT METABOLIZE XYLOSE”, published Nov. 15, 2012.
The oleaginous cells may, optionally, be cultivated in a bioreactor/fermenter. For example, heterotrophic oleaginous microalgal cells can be cultivated on a sugar-containing nutrient broth. Optionally, cultivation can proceed in two stages: a seed stage and a lipid-production stage. In the seed stage, the number of cells is increased from s starter culture. Thus, the seeds stage typically includes a nutrient rich, nitrogen replete, media designed to encourage rapid cell division. After the seeds stage, the cells may be fed sugar under nutrient-limiting (e.g. nitrogen sparse) conditions so that the sugar will be converted into triglycerides. For example, the rate of cell division in the lipid-production stage can be decreased by 50%, 80% or more relative to the seed stage. Additionally, variation in the media between the seed stage and the lipid-production stage can induce the recombinant cell to express different lipid-synthesis genes and thereby alter the triglycerides being produced. For example, as discussed below, nitrogen and/or pH sensitive promoters can be placed in front of endogenous or exogenous genes. This is especially useful when an oil is to be produced in the lipid-production phase that does not support optimal growth of the cells in the seed stage. In an example below, a cell has a fatty acid desaturase with a pH sensitive promoter so than an oil that is low in linoleic acid is produced in the lipid production stage while an oil that has adequate linoleic acid for cell division is produced during the seed stage. The resulting low linoleic oil has exceptional oxidative stability.
The oleaginous cells express one or more exogenous genes encoding fatty acid biosynthesis enzymes. As a result, some embodiments feature natural oils that were not obtainable from a non-plant or non-seed oil, or not obtainable at all.
The oleaginous cells produce a storage oil, which is primarily triacylglyceride and may be stored in storage bodies of the cell. A raw oil may be obtained from the cells by disrupting the cells and isolating the oil. The raw oil may comprise sterols produced by the cells. WO2008/151149, WO2010/06032, WO2011/150410, WO2011/1504 WO2012/061647, and WO2012/106560 disclose heterotrophic cultivation and oil isolation techniques. For example, oil may be obtained by providing or cultivating, drying and pressing the cells. The oils produced may be refined, bleached and deodorized (RBD) as known in the art or as described in WO2010/120939. The raw or RBD oils may be used in a variety of food, chemical, and industrial products or processes. Even after such processing, the oil may retain a sterol profile characteristic of the source. Microalgal sterol profiles are disclosed below. See especially Section XII of this patent application. After recovery of the oil, a valuable residual biomass remains. Uses for the residual biomass include the production of paper, plastics, absorbents, adsorbents, drilling fluids, as animal feed, for human nutrition, or for fertilizer.
Where a fatty acid profile of a triglyceride (also referred to as a “triacylglyceride” or “TAG”) cell oil is given here, it will be understood that this refers to a nonfractionated sample of the storage oil extracted from the cell analyzed under conditions in which phospholipids have been removed or with an analysis method that is substantially insensitive to the fatty acids of the phospholipids (e.g. using chromatography and mass spectrometry). The oil may be subjected to an RBD process to remove phospholipids, free fatty acids and odors yet have only minor or negligible changes to the fatty acid profile of the triglycerides in the oil. Because the cells are oleaginous, in some cases the storage oil will constitute the bulk of all the TAGs in the cell. Examples 1, 2, and 8 below give analytical methods for determining TAG fatty acid composition and regiospecific structure.
Broadly categorized, certain embodiments provided herein include (i) auxotrophs of particular fatty acids; (ii) cells that produce oils having low concentrations of polyunsaturated fatty acids, including cells that are auxotrophic for unsaturated fatty acids; (iii) cells producing oils having high concentrations of particular fatty acids due to expression of one or more exogenous genes encoding enzymes that transfer fatty acids to glycerol or a glycerol ester; (iv) cells producing regiospecific oils, and (v) genetic constructs or cells encoding a newly discovered gene encoding an LPAAT enzyme from Cuphea PSR23 (see Example 43). The embodiments also encompass the oils made by such cells, the residual biomass from such cells after oil extraction, oleochemicals, fuels and food products made from the oils and methods of cultivating the cells.
In any of the embodiments below, the cells used are optionally cells having a type II fatty acid biosynthetic pathway such as microalgal cells including heterotrophic or obligate heterotrophic microalgal cells, including cells classified as Chlorophyta, Trebouxiophyceae, Chlorellales, Chlorellaceae, or Chlorophyceae, or cells engineered to have a type II fatty acid biosynthetic pathway using the tools of synthetic biology (i.e., transplanting the genetic machinery for a type II fatty acid biosynthesis into an organism lacking such a pathway). In specific embodiments, the cell is of the species Prototheca moriformis, Prototheca krugani, Prototheca stagnora or Prototheca zopfii or has a 23S rRNA sequence with at least 65, 70, 75, 80, 85, 90 or 95% nucleotide identity SEQ ID NO: 76. By cultivating in the dark or using an obligate heterotroph, the natural oil produced can be low in chlorophyll or other colorants. For example, the natural oil can have less than 100, 50, 10, 5, 1, 0.0.5 ppm of chlorophyll without substantial purification.
The stable carbon isotope value δ13C is an expression of the ratio of 13C/12C relative to a standard (e.g. PDB, carbonite of fossil skeleton of Belemnite americana from Peedee formation of South Carolina). The stable carbon isotope value δ13C (‰) of the oils can be related to the δ13C value of the feedstock used. In some embodiments the oils are derived from oleaginous organisms heterotrophically grown on sugar derived from a C4 plant such as corn or sugarcane. In some embodiments the δ13C (‰) of the oil is from −10 to −17‰ or from −13 to −16‰.
In specific embodiments and examples discussed below, one or more fatty acid synthesis genes (e.g., encoding an acyl-ACP thioesterase, a keto-acyl ACP synthase, an LPAAT, a stearoyl ACP desaturase, or others described herein) is incorporated into a microalga. It has been found that for certain microalga, a plant fatty acid synthesis gene product is functional in the absence of the corresponding plant acyl carrier protein (ACP), even when the gene product is an enzyme, such as an acyl-ACP thioesterase, that requires binding of ACP to function. Thus, optionally, the microalgal cells can utilize such genes to make a desired oil without co-expression of the plant ACP gene.
III. Fatty Acid Auxotrophs/Reducing Fatty Acid Levels to Growth Inhibitory Conditions During an Oil Production Phase
In an embodiment, the cell is genetically engineered so that all alleles of a lipid pathway gene are knocked out. Alternately, the amount or activity of the gene products of the alleles is knocked down so as to require supplementation with fatty acids. A first transformation construct can be generated bearing donor sequences homologous to one or more of the alleles of the gene. This first transformation construct may be introduced and selection methods followed to obtain an isolated strain characterized by one or more allelic disruptions. Alternatively, a first strain may be created that is engineered to express a selectable marker from an insertion into a first allele, thereby inactivating the first allele. This strain may be used as the host for still further genetic engineering to knockout or knockdown the remaining allele(s) of the lipid pathway gene. Complementation of the endogenous gene can be achieved through engineered expression of an additional transformation construct bearing the endogenous gene whose activity was originally ablated, or through the expression of a suitable heterologous gene. The expression of the complementing gene can either be regulated constitutively or through regulatable control, thereby allowing for tuning of expression to the desired level so as to permit growth or create an auxotrophic condition at will. In an embodiment, a population of the fatty acid auxotroph cells are used to screen or select for complementing genes; e.g., by transformation with particular gene candidates for exogenous fatty acid synthesis enzymes, or a nucleic acid library believed to contain such candidates.
Knockout of all alleles of the desired gene and complementation of the knocked-out gene need not be carried out sequentially. The disruption of an endogenous gene of interest and its complementation either by constitutive or inducible expression of a suitable complementing gene can be carried out in several ways. In one method, this can be achieved by co-transformation of suitable constructs, one disrupting the gene of interest and the second providing complementation at a suitable, alternative locus. In another method, ablation of the target gene can be effected through the direct replacement of the target gene by a suitable gene under control of an inducible promoter. In this way, expression of the targeted gene is now put under the control of a regulatable promoter. An additional approach is to replace the endogenous regulatory elements of a gene with an exogenous, inducible gene expression system. Under such a regime, the gene of interest can now be turned on or off depending upon the particular needs. A still further method is to create a first strain to express an exogenous gene capable of complementing the gene of interest, then to knockout out or knockdown all alleles of the gene of interest in this first strain. The approach of multiple allelic knockdown or knockout and complementation with exogenous genes may be used to alter the fatty acid profile, regiospecific profile, sn-2 profile, or the TAG profile of the engineered cell.
In a specific embodiment, the recombinant cell comprises nucleic acids operable to reduce the activity of an endogenous acyl-ACP thioesterase; for example a FatA or FatB acyl-ACP thioesterase having a preference for hydrolyzing fatty acyl-ACP chains of length C18 (e.g., stearate (C18:0) or oleate (C18:1), or C8:0-C16:0 fatty acids. The activity of an endogenous acyl-ACP thioesterase may be reduced by knockout or knockdown approaches. Knockdown may be achieved, for example, through the use of one or more RNA hairpin constructs, by promoter hijacking (substitution of a lower activity or inducible promoter for the native promoter of an endogenous gene), or by a gene knockout combined with introduction of a similar or identical gene under the control of an inducible promoter. Example 34 describes the engineering of a Prototheca strain in which two alleles of the endogenous fatty acyl-ACP thioesterase (FATA1) have been knocked out. The activity of the Prototheca moriformis FATA1 was complemented by the expression of an exogenous FatA or FatB acyl-ACP thioesterase. Example 36 details the use of RNA hairpin constructs to reduce the expression of FATA in Prototheca, which resulted in an altered fatty acid profile having less palmitic acid and more oleic acid.
Accordingly, oleaginous cells, including those of organisms with a type II fatty acid biosynthetic pathway can have knockouts or knockdowns of acyl-ACP-thioesterase encoding alleles to such a degree as to eliminate or severely limit viability of the cells in the absence of fatty acid supplementation or genetic complementations. These strains can be used to select for transformants expressing acyl-ACP-thioesterase transgenes. Alternately, or in addition, the strains can be used to completely transplant exogenous acyl-ACP-thioesterases to give dramatically different fatty acid profiles of natural oils produced by such cells. For example, FATA expression can be completely or nearly completely eliminated and replaced with FATB genes that produce mid-chain fatty acids. In certain specific embodiments, these transformants produce natural oils with more than 50, 60, 70, 80, or 90% caprylic, capric, lauric, myristic, or palmitic acid, or total fatty acids of chain length less than 18 carbons. Such cells may require supplementation with longer chain fatty acids such as stearic or oleic acid or switching of environmental conditions between growth permissive and restrictive states in the case of an inducible promoter regulating a FatA gene.
In an embodiment the oleaginous cells are cultured (e.g., in a bioreactor). The cells are fully auxotrophic or partially auxotrophic (i.e., lethality or synthetic sickness) with respect to one or more types of fatty acid. The cells are cultured with supplementation of the fatty acid(s) so as to increase the cell number, then allowing the cells to accumulate oil (e.g. to at least 40% by dry cell weight). Alternatively, the cells comprise a regulatable fatty acid synthesis gene that can be switched in activity based on environmental conditions and the environmental conditions during a first, cell division, phase favor production of the fatty acid and the environmental conditions during a second, oil accumulation, phase disfavor production of the fatty acid. In the case of an inducible gene, the regulation of the inducible gene can be mediated, without limitation, via environmental pH (for example, by using the AMT3 promoter as described in the Examples).
As a result of applying either of these supplementation or regulation methods, a cell oil may be obtained from the cell that has low amounts of one or more fatty acids essential for optimal cell propagation. Specific examples of oils that can be obtained include those low in stearic, linoleic and/or linolenic acids.
These cells and methods are illustrated in connection with low polyunsaturated oils in the section immediately below and in Example 6 (fatty acid desaturase auxotroph) in connection with oils low in polyunsaturated fatty acids and in Example 34 (acyl-ACP thioesterase auxotroph).
Likewise, fatty acid auxotrophs can be made in other fatty acid synthesis genes including those encoding a SAD, FAD, KASIII, KASI, KASII, KCS, elongase, GPAT, LPAAT, DGAT or AGPAT or PAP. These auxotrophs can also be used to select for complement genes or to eliminate native expression of these genes in favor of desired exogenous genes in order to alter the fatty acid profile, regiospecific profile, or TAG profile of natural oils produced by oleaginous cells.
Accordingly, in an embodiment of the invention, there is a method for producing an oil/fat. The method comprises cultivating a recombinant oleaginous cell in a growth phase under a first set of conditions that is permissive to cell division so as to increase the number of cells due to the presence of a fatty acid, cultivating the cell in an oil production phase under a second set of conditions that is restrictive to cell division but permissive to production of an oil that is depleted in the fatty acid, and extracting the oil from the cell, wherein the cell has a mutation or exogenous nucleic acids operable to suppress the activity of a fatty acid synthesis enzyme, the enzyme optionally being a stearoyl-ACP desaturase, delta 12 fatty acid desaturase, or a ketoacyl-ACP synthase. The oil produced by the cell can be depleted in the fatty acid by at least 50, 60, 70, 80, or 90%. The cell can be cultivated heterotrophically. The cell can be a microalgal cell cultivated heterotrophically or autotrophically and may produce at least 40, 50, 60, 70, 80, or 90% oil by dry cell weight.
IV. Low Polyunsaturated Natural Oils
In an embodiment of the present invention, the natural oil produced by the cell has very low levels of polyunsaturated fatty acids. As a result, the natural oil can have improved stability, including oxidative stability. The natural oil can be a liquid or solid at room temperature, or a blend of liquid and solid oils, including the regiospecific or stereospecific oils, high stearate oils, or high mid-chain oils described infra. Oxidative stability can be measured by the Rancimat method using the AOCS Cd 12b-92 standard test at a defined temperature. For example, the OSI (oxidative stability index) test may be run at temperatures between 110° C. and 140° C. The oil is produced by cultivating cells (e.g., any of the plastidic microbial cells mentioned above or elsewhere herein) that are genetically engineered to reduce the activity of one or more fatty acid desaturase. For example, the cells may be genetically engineered to reduce the activity of one or more fatty acyl Δ12 desaturase(s) responsible for converting oleic acid (18:1) into linoleic acid (18:2) and/or one or more fatty acyl Δ15 desaturase(s) responsible for converting linoleic acid (18:2) into linolenic acid (18:3). Various methods may be used to inhibit the desaturase including knockout or mutation of one or more alleles of the gene encoding the desaturase in the coding or regulatory regions, inhibition of RNA transcription, or translation of the enzyme, including RNAi, siRNA, miRNA, dsRNA, antisense, and hairpin RNA techniques. Other techniques known in the art can also be used including introducing an exogenous gene that produces an inhibitory protein or other substance that is specific for the desaturase.
In a specific embodiment, fatty acid desaturase (e.g., Δ12 fatty acid desaturase) activity in the cell is reduced to such a degree that the cell is unable to be cultivated or is difficult to cultivate (e.g., the cell division rate is decreased more than 10, 20, 30, 40, 50, 60, 70, 80, 90, 95, 97 or 99%). Achieving such conditions may involve knockout, or effective suppression of the activity of multiple gene copies (e.g. 2, 3, 4 or more) of the desaturase or their gene products. A specific embodiment includes the cultivation in cell culture of a full or partial fatty acid auxotroph with supplementation of the fatty acid or a mixture of fatty acids so as to increase the cell number, then allowing the cells to accumulate oil (e.g. to at least 40% by cell weight). Alternatively, the cells comprise a regulatable fatty acid synthesis gene that can be switched in activity. For example, the regulation can be based on environmental conditions and the environmental conditions during a first, cell division, phase favor production of the fatty acid and the environmental conditions during a second, oil accumulation, phase disfavor production of the oil. For example, culture media pH and/or nitrogen levels can be used as an environmental control to switch expression of a lipid pathway gene to produce a state of high or low synthetic enzyme activity. Examples of such cells are described in Example 7.
In a specific embodiment, a cell is cultivated using a modulation of linoleic acid levels within the cell. In particular, the natural oil is produced by cultivating the cells under a first condition that is permissive to an increase in cell number due to the presence of linoleic acid and then cultivating the cells under a second condition that is characterized by linoleic acid starvation and thus is inhibitory to cell division, yet permissive of oil accumulation. For example, a seed culture of the cells may be produced in the presence of linoleic acid added to the culture medium. For example, the addition of linoleic acid to 0.25 g/L in the seed culture of a Prototheca strain deficient in linoleic acid production due to ablation of two alleles of a fatty acyl Δ12 desaturase (i.e., a linoleic auxotroph) was sufficient to support cell division to a level comparable to that of wild type cells. Optionally, the linoleic acid can then be consumed by the cells, or otherwise removed or diluted. The cells are then switched into an oil producing phase (e.g., supplying sugar under nitrogen limiting conditions such as described in WO2010/063032). Surprisingly, oil production has been found to occur even in the absence of linoleic acid production or supplementation, as demonstrated in the obligate heterotroph oleaginous microalgae Prototheca but generally applicable to other oleaginous microalgae, microorganisms, or even multicellular organisms (e.g., cultured plant cells). Under these conditions, the oil content of the cell can increase to about 10, 20, 30, 40, 50, 60, 70, 80, 90%, or more by dry cell weight, while the oil produced can have polyunsaturated fatty acid (e.g.; linoleic+linolenic) profile with 5%, 4%, 3%, 2%, 1%, 0.5%, 0.3%, 0.2%, 0.1%, 0.05% or less, as a percent of total triacylglycerol fatty acids in the oil. For example, the oil content of the cell can be 50% or more by dry cell weight and the triglyceride of the oil produced less than 3% polyunsaturated fatty acids.
These oils can also be produced without the need (or reduced need) to supplement the culture with linoleic acid by using cell machinery to produce the linoleic acid, during the cell division phase, but less or no linoleic acid in the lipid production phase. The linoleic-producing cell machinery may be regulatable so as to produce substantially less linoleic acid during the oil producing phase. The regulation may be via modulation of transcription of the desaturase gene(s) or modulation of production of an inhibitor substance (e.g., regulated production of hairpin RNA/RNAi). For example, the majority, and preferably all, of the fatty acid Δ12 desaturase activity can be placed under a regulatable promoter regulated to express the desaturase in the cell division phase, but to be reduced or turned off during the oil accumulation phase. The regulation can be linked to a cell culture condition such as pH, and/or nitrogen level, as described in the examples herein, or other environmental condition. In practice, the condition may be manipulated by adding or removing a substance (e.g., protons via addition of acid or base) or by allowing the cells to consume a substance (e.g, nitrogen-supplying nutrients) to effect the desired switch in regulation of the desaturase activity.
Other genetic or non-genetic methods for regulating the desaturase activity can also be used. For example, an inhibitor of the desaturase can be added to the culture medium in a manner that is effective to inhibit polyunsaturated fatty acids from being produced during the oil production phase.
Accordingly, in a specific embodiment of the invention, there is a method comprising providing a recombinant cell having a regulatable delta 12 fatty acid desaturase gene, under control of a recombinant regulatory element via an environmental condition. The cell is cultivated under conditions that favor cell multiplication. Upon reaching a given cell density, the cell media is altered to switch the cells to lipid production mode by nutrient limitation (e.g. reduction of available nitrogen). During the lipid production phase, the environmental condition is such that the activity of the delta 12 fatty acid desaturase is downregulated. The cells are then harvested and, optionally, the oil extracted. Due to the low level of delta 12 fatty acid desaturase during the lipid production phase, the oil has less polyunsaturated fatty acids and has improved oxidative stability. Optionally the cells are cultivated heterotrophically and optionally microalgal cells.
Using one or more of these desaturase regulation methods, it is possible to obtain a natural oil that it is believed has been previously unobtainable, especially in large scale cultivation in a bioreactor (e.g., more than 1000 L). The oil can have polyunsaturated fatty acid levels that are 5%, 4%, 3%, 2%, 1%, 0.5%, 0.3%, 0.2%, or less, as an area percent of total triacylglycerol fatty acids in the oil.
One consequence of having such low levels of polyunsaturates is that oils are exceptionally stable to oxidation. Indeed, in some cases the oils may be more stable than any previously known natural cell oil. In specific embodiments, the oil is stable, without added antioxidants, at 110° C. so that the inflection point in conductance is not yet reached by 10 hours, 15 hours, 20 hours, 30 hours, 40, hours, 50 hours, 60 hours, or 70 hours under conditions of the AOCS Cd 12b-92. Rancimat test, noting that for very stable oils, replenishment of water may be required in such a test due to evaporation that occurs with such long testing periods (see Example 5). For example the oil can have and OSI value of 40-50 hours or 41-46 hours at 110° C. without added antioxidants. When antioxidants (suitable for foods or otherwise) are added, the OSI value measured may be further increased. For example, with added tocopherol (100 ppm) and ascorbyl palmitate (500 ppm) or PANA and ascorbyl palmitate, such an oil can have an oxidative stability index (OSI value) at 110° C. in excess 100 or 200 hours, as measured by the Rancimat test. In another example, 1050 ppm of mixed tocopherols and 500 pm of ascorbyl palmitate are added to an oil comprising less than 1% linoleic acid or less than 1% linoleic+linolenic acids; as a result, the oil is stable at 110° C. for 1, 2, 3, 4, 5, 6, 7, 8, or 9, 10, 11, 12, 13, 14, 15, or 16, 20, 30, 40 or 50 days, 5 to 15 days, 6 to 14 days, 7 to 13 days, 8 to 12 days, 9 to 11 days, about 10 days, or about 20 days. The oil can also be stable at 130° C. for 1, 2, 3, 4, 5, 6, 7, 8, or 9, 10, 11, 12, 13, 14, 15, or 16, 20, 30, 40 or 50 days, 5 to 15 days, 6 to 14 days, 7 to 13 days, 8 to 12 days, 9 to 11 days, about 10 days, or about 20 days. In a specific example, such an oil was found to be stable for greater than 100 hours (about 128 hours as observed). In a further embodiment, the OSI value of the natural oil without added antioxidants at 120° C. is greater than 15 hours or 20 hours or is in the range of 10-15, 15-20, 20-25, or 25-50 hours, or 50-100 hours.
In an example, using these methods, the oil content of a microalgal cell is between 40 and about 85% by dry cell weight and the polyunsaturated fatty acids in the fatty acid profile of the oil is between 0.001% and 3% in the fatty acid profile of the oil and optionally yields a natural oil having an OSI induction time of at least 20 hours at 110° C. without the addition of antioxidants. In yet another example, there is a natural oil produced by RBD treatment of a natural oil from an oleaginous cell, the oil comprises between 0.001% and 2% polyunsaturated fatty acids and has an OSI induction time exceeding 30 hours at 11° C. without the addition of antioxidants. In yet another example, there is a natural oil produced by RBD treatment of a natural oil from an oleaginous cell, the oil comprises between 0.001% and 1% polyunsaturated fatty acids and has an OSI induction time exceeding 30 hours at 110° C. without the addition of antioxidants.
In another specific embodiment there is an oil with reduced polyunsaturate levels produced by the above-described methods. The oil is combined with antioxidants such as PANA and ascorbyl palmitate. For example, it was found that when such an oil was combined with 0.5% PANA and 500 ppm of ascorbyl palmitate the oil had an OSI value of about 5 days at 130° C. or 21 days at 110° C. These remarkable results suggest that not only is the oil exceptionally stable, but these two antioxidants are exceptionally potent stabilizers of triglyceride oils and the combination of these antioxidants may have general applicability including in producing stable biodegradable lubricants (e.g., jet engine lubricants). In specific embodiments, the genetic manipulation of fatty acyl Δ12 desaturase results in a 2 to 30, or 5 to 25, or 10 to 20 fold increase in OSI (e.g., at 110° C.) relative to a strain without the manipulation. The oil can be produced by suppressing desaturase activity in a cell, including as described above.
Antioxidants suitable for use with the oils of the present invention include alpha, delta, and gamma tocopherol (vitamin E), tocotrienol, ascorbic acid (vitamin C), glutathione, lipoic acid, uric acid, β-carotene, lycopene, lutein, retinol (vitamin A), ubiquinol (coenzyme Q), melatonin, resveratrol, flavonoids, rosemary extract, propyl gallate (PG), tertiary butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA), and butylated hydroxytoluene (BHT), N,N′-di-2-butyl-1,4-phenylenediamine, 2,6-di-tert-butyl-4-methylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butylphenol, and phenyl-alpha-naphthylamine (PANA).
In addition to the desaturase modifications, in a related embodiment other genetic modifications may be made to further tailor the properties of the oil, as described throughout, including introduction or substitution of acyl-ACP thioesterases having altered chain length specificity and/or overexpression of an endogenous or exogenous gene encoding a KAS, SAD, LPAAT, or DGAT gene. For example, a strain that produces elevated oleic levels may also produce low levels of polyunsaturates. Such genetic modifications can include increasing the activity of stearoyl-ACP desaturase (SAD) by introducing an exogenous SAD gene, increasing elongase activity by introducing an exogenous KASII gene, and/or knocking down or knocking out a FATA gene.
In a specific embodiment, a high oleic natural oil with low polyunsaturates may be produced. For example, the oil may have a fatty acid profile with greater than 60, 70, 80, 90, or 95% oleic acid and less than 5, 4, 3, 2, or 1% polyunsaturates. In related embodiments, a natural oil is produced by a cell having recombinant nucleic acids operable to decrease fatty acid Δ12 desaturase activity and optionally fatty acid Δ15 desaturase so as to produce an oil having less than or equal to 3% polyunsaturated fatty acids with greater than 60% oleic acid, less than 2% polyunsaturated fatty acids and greater than 70% oleic acid, less than 1% polyunsaturated fatty acids and greater than 80% oleic acid, or less than 0.5% polyunsaturated fatty acids and greater than 90% oleic acid. It has been found that one way to increase oleic acid is to use recombinant nucleic acids operable to decrease expression of a FATA acyl-ACP thioesterase and optionally overexpress a KAS II gene; such a cell can produce an oil with greater than or equal to 75% oleic acid. Alternately, overexpression of KASII can be used without the FATA knockout or knockdown. Oleic acid levels can be further increased by reduction of delta 12 fatty acid desaturase activity using the methods above, thereby decreasing the amount of oleic acid the is converted into the unsaturates linoleic acid and linolenic acid. Thus, the oil produced can have a fatty acid profile with at least 75% oleic and at most 3%, 2%, 1%, or 0.5% linoleic acid. In a related example, the oil has between 80 to 95% oleic acid and about 0.001 to 2% linoleic acid, 0.01 to 2% linoleic acid, or 0.1 to 2% linoleic acid. Such oils will have a low freezing point, with excellent stability and are useful in foods, for frying, fuels, or in chemical applications. Further, these oils may exhibit a reduced propensity to change color over time. In an illustrative chemical application, the high oleic oil is used to produce a chemical. The oleic acid double bonds of the oleic acid groups of the triglycerides in the oil can be epoxidized or hydroxylated to make a polyol. The epoxidized or hydroxylated oil can be used in a variety of applications. One such application is the production of polyurethane (including polyurethane foam) via condensation of the hydroxylated triglyceride with an isocyanate, as has been practiced with hydroxylated soybean oil or castor oil. See, e.g. US2005/0239915, US2009/0176904, US2005/0176839, US2009/0270520, and U.S. Pat. No. 4,264,743 and Zlatanic, et al, Biomacromolecules 2002, 3, 1048-1056 (2002) for examples of hydroxylation and polyurethane condensation chemistries. Suitable hydroxyl forming reactions include epoxidation of one or more double bonds of a fatty acid followed by acid catalyzed epoxide ring opening with water (to form a diol), alcohol (to form a hydroxyl ether), or an acid (to form a hydroxyl ester). There are multiple advantages of using the high-oleic/low polyunsaturated oil in producing a bio-based polyurethane: (1) the shelf-life, color or odor, of polyurethane foams may be improved; (2) the reproducibility of the product may be improved due to lack of unwanted side reactions resulting from polyunsaturates; (3) a greater degree of hydroxylation reaction may occur due to lack of polyunsaturates and the structural characteristics of the polyurethane product can be improved accordingly.
The low polyunsaturated or high oleic/low polyunsaturated oils described here may be advantageously used in chemical applications where yellowing is undesirable. For example, yellowing can be undesirable in paints or coatings made from the triglycerides fatty acids derived from the triglycerides. Yellowing may be caused by reactions involving polyunsaturated fatty acids and tocotrienols and/or tocopherols. Thus, producing the high stability oil in an oleaginous microbe with low levels of tocotrienols can be advantageous in elevating high color stability a chemical composition made using the oil. In contrast to commonly used plant oils, through appropriate choice of oleaginous microbe, the natural oils of these embodiments can have tocopherols and tocotrienols levels of 1 g/L or less. In a specific embodiment, a natural oil has a fatty acid profile with less than 2% with polyunsaturated fatty acids and less than 1 g/L for tocopherols, tocotrienols or the sum of tocopherols and tocotrienols. In another specific embodiment, the natural oil has a fatty acid profile with less than 1% with polyunsaturated fatty acids and less than 0.5 g/L for tocopherols, tocotrienols or the sum of tocopherols and tocotrienols
Any of the high-stability (low-polyunsaturate) natural oils or derivatives thereof can be used to formulate foods, drugs, vitamins, nutraceuticals, personal care or other products, and are especially useful for oxidatively sensitive products. For example, the high-stability natural oil (e.g., less than or equal to 3%, 2% or 1% polyunsaturates) can be used to formulate a sunscreen (e.g. a composition having one or more of avobenzone, homosalate, octisalate, octocrylene or oxybenzone) or retinoid face cream with an increased shelf life due to the absence of free-radical reactions associated with polyunsaturated fatty acids. For example, the shelf-life can be increased in terms of color, odor, organoleptic properties or % active compound remaining after accelerated degradation for 4 weeks at 54° C. The high stability oil can also be used as a lubricant with excellent high-temperature stability. In addition to stability, the oils can be biodegradable, which is a rare combination of properties.
In another related embodiment, the fatty acid profile of a natural oil is elevated in C8 to C16 fatty acids through additional genetic modification, e.g. through overexpression of a short-chain to mid chain preferring acyl-ACP thioesterase or other modifications described here. A low polyunsaturated oil in accordance with these embodiments can be used for various industrial, food, or consumer products, including those requiring improved oxidative stability. In food applications, the oils may be used for frying with extended life at high temperature, or extended shelf life.
Where the oil is used for frying, the high stability of the oil may allow for frying without the addition of antioxidant and/or defoamers (e.g. silicone). As a result of omitting defoamers, fried foods may absorb less oil. Where used in fuel applications, either as a triglyceride or processed into biodiesel or renewable diesel (see, e.g., WO2008/151149 WO2010/063032, and WO2011/150410), the high stability can promote storage for long periods, or allow use at elevated temperatures. For example, the fuel made from the high stability oil can be stored for use in a backup generator for more than a year or more than 5 years. The frying oil can have a smoke point of greater than 200° C., and free fatty acids of less than 0.1% (either as a natural oil or after refining).
The low polyunsaturated oils may be blended with food oils, including structuring fats such as those that form beta or beta prime crystals, including those produced as described below. These oils can also be blended with liquid oils. If mixed with an oil having linoleic acid, such as corn oil, the linoleic acid level of the blend may approximate that of high oleic plant oils such as high oleic sunflower oils (e.g., about 80% oleic and 8% linoleic).
Blends of the low polyunsaturated natural oil can be interesterified with other oils. For example, the oil can be chemically or enzymatically interesterified. In a specific embodiment, a low polyunsaturated oil according to an embodiment of the invention has at least 10% oleic acid in its fatty acid profile and less than 5% polyunsaturates and is enzymatically interesterified with a high saturate oil (e.g. hydrogenated soybean oil or other oil with high stearate levels) using an enzyme that is specific for sn-1 and sn-2 triacylglycerol positions. The result is an oil that includes a stearate-oleate-stearate (SOS). Methods for interesterification are known in the art; see for example, “Enzymes in Lipid Modification,” Uwe T. Bomschuer, ed., Wiley_VCH, 2000, ISBN 3-527-30176-3.
High stability oils can be used as spray oils. For example, dried fruits such as raisins can be sprayed with a high stability oil having less than 5, 4, 3, 2, or 1% polyunsaturates. As a result, the spray nozzle used will become clogged less frequently due to polymerization or oxidation product buildup in the nozzle that might otherwise result from the presence of polyunsaturates.
In a further embodiment, an oil that is high is SOS, such as those described below can be improved in stability by knockdown or regulation of delta 12 fatty acid desaturase.
Oils that contain high amounts of polyunsaturated fatty acids, e.g., 7% or higher, are less stable than oils with lower amounts of PUFAs. Polyunsaturated fatty acids contain two or more double bonds. PUFAs are more susceptible to oxidative degradation and/or polymerization than PUFAs that contain only one double bond and are also more susceptible to oxidative degradation and/or polymerization than fully saturated fatty acids. Oils with lower amounts of PUFAs are more robust and consequently are more desirable in applications where stability is a concern. Such applications include those were the oil is exposed to high and/or prolonged heat, light, and oxidative conditions.
Spray oils comprising the high oleic, low PUFA oils of the invention are applied to various products including human and animal foods. As an oil moves through the orifice during the spraying process, oils that have PUFAs polymerize and form a film, thereby clogging the orifice. Oils that comprise more than 7% PUFAs polymerize more readily than oils that contain less than 7% PUFAs. The high oleic, low PUFA oils of the present invention reduce clogging of the orifices that the oil is sprayed from. The spraying device therefor can operate for longer periods between maintenance cycles.
A release agent comprising the high oleic, low PUFA oils of the invention are used during manufacturing of a product to facilitate release of the product from the mold. During the manufacturing process, oils that have PUFAs degrade and/or polymerize to form a film. The degradation products and film formed from the PUFAs inhibit the release of the product from the mold. The degradation products and film formed from the PUFAs also adversely impact the finished product by discoloring the product or imparting an unacceptable odor. Oils that comprise more than 7% PUFAs degrade and/or polymerize more readily than oils that contain less than 7% PUFAs. The high oleic, low PUFA oils of the present invention minimizes the discoloration and odor imparted to the product as compared to a release agent comprising more than 7% PUFAs.
A heat transfer fluid comprising the high oleic, low PUFA oils of the invention provide longer service life than a heat transfer fluid comprising conventional triglyceride oils that contain higher amounts of PUFA (e.g., vegetable oil or a high oleic vegetable oil). The longer service life results from the low amounts of PUFAs. As a heat transfer fluid dissipates heat generated during the operation of the device for example, a dielectric fluid in a high voltage transformer or a computer server coolant, the PUFAs oxidize and form degradation products, and/or the PUFAs polymerize forming films. Conventional triglyceride oils that comprise more than 7% PUFAs degrade and/or polymerize more readily than oils that contain less than 7% PUFAs. The heat transfer fluids comprising high oleic, low PUFA oils are more resistant to oxidation and polymerization during the service life of the fluid. Heat transfer fluids comprising high oleic, low PUFA oils of the present invention provide longer service life as compared to a heat transfer fluids comprising triglyceride oils that contain more than 7% PUFAs.
A hydraulic fluid comprising the high oleic, low PUFA oils of the invention provide longer service life than a hydraulic fluid comprising conventional triglyceride oils. During use, lubricants that comprising PUFAs degrade and/or polymerize to form a film. The degradation products and film formed from the PUFAs decreases the lubricity of the lubricant. Conventional oils that comprise more than 7% PUFAs degrade and/or polymerize more readily than oils that contain less than 7% PUFAs. The high oleic, low PUFA oils of the present invention provides longer service life as compared to a lubricant comprising more than 7% PUFAs.
A hydraulic fluid comprising the high oleic, low PUFA oils of the invention provide longer service life than a hydraulic fluid comprising conventional triglyceride oils. During use, lubricants that comprising PUFAs degrade and/or polymerize to form a film. The degradation products and film formed from the PUFAs decreases the lubricity of the lubricant. Conventional oils that comprise more than 7% PUFAs degrade and/or polymerize more readily than oils that contain less than 7% PUFAs. The high oleic, low PUFA oils of the present invention provides longer service life as compared to a lubricant comprising more than 7% PUFAs.
A lubricant comprising the high oleic, low PUFA oils of the invention provide longer service life than a lubricant comprising conventional triglyceride oils that contain higher amounts of PUFA (e.g., vegetable oil or a high oleic vegetable oil). During use, lubricants that comprising PUFAs degrade and/or polymerize to form a film. The degradation products and film formed from the PUFAs decreases the lubricity of the lubricant. Conventional triglyceride oils that comprise more than 7% PUFAs degrade and/or polymerize more readily than oils that contain less than 7% PUFAs. Lubricants comprising high oleic, low PUFA oils of the present invention provide longer service life as compared to a lubricant comprising triglyceride oils that contain more than 7% PUFAs.
A polyurethane is a compound that comprises a carbamate (urethane) linkage. In some embodiments the polyurethane is a polymer of organic units. The polymer is prepared by the reaction of a first organic unit comprising an isocyanate moiety (e.g., C(O)N—R1—NC(O)) and a second organic unit comprising a hydroxyl group (e.g., HO—R2—OH) or an epoxide group (e.g., (—CH(O)CH—R2—CH(O)HC—). A polyurethane can be represented as —[C(O)NH—R1—NHC(O)—O—R2—O]m-, wherein the subscript m is a number that denotes the number of monomers contained in the polymer. R1 and R2 can be the same or different, but are typically different. Polyurethanes are used in many different applications including both flexible and rigid materials. Polyurethanes are used in shoes, automobiles, airplanes, bushings, gaskets, adhesives, carpeting, spandex fibers, housing for electronics and the like.
In yet another embodiment provided is a composition prepared by reacting a hydroxylated oil, an epoxidated oil and/or a hydroxylated fatty acid, or epoxidated fatty acid with a compound that contains an isocyanate moiety to form a polyurethane
In one embodiment provided is a composition prepared by reacting a polyol (e.g., hydroxylated oil and/or a hydroxylated fatty acid) or an epoxidated oil or expoxidated fatty acid with a compound that contains an isocyanate moiety. The unsaturated portions of the fatty acid or oil are hydroxylated or epoxidated first by well-known chemistries prior to reaction with an isocyanate. Polyurethanes using castor oil and an isocyanate have been produced. Polyurethanes are ubiquitous in the products we use today. Polyurethanes are found in automobiles, toys, atheletic equipment, consumer electronics, shoes, mattresses, cushions, adhesives, construction materials, and the like. Currently, polyurethanes made with castor oil are commercially available from BASF, Itoh Oil and others. Polyurethanes made with hydroxylated soybean oil are commercially available from Cargill, Dow, Bayer and others.
In various embodiments, the compositions provided herein include one or more additive(s), such as an antioxidant, a metal ion deactivator, a corrosion inhibitor, moisture scavenger, a demulsifier, an anti-wear additive, a pour point depressant, or an anti-hydrolysis compound.
In various embodiments the compositions provided herein further comprise one or more of (a) an antioxidant, including but not limited to tocopherols, BHT and other phenols; (b) a deactivator of metal ions such as Cu, Zn, and the like, including but not limited to a benzotriazole; (c) corrosion inhibitors, including but not limited to ester sulfonates and succinic acid esters; (d) demulsifiers; (e) anti-wear additives, including but not limited to zinc dithiophosphate; (f) additives to depress the pour point, including but not limited to malan styrene copolymers and poly(alkyl)acrylates, including but not limited to polymethacrylates; and (g) compounds that protect against hydrolysis, including but not limited to carbodiimides, (h) a pour point depressant, including but not limited to VISCOPLEX® 10-310 or 1-133 (Rohmax-Evonik Additives GmbH), or other poly(alkyl)acrylates and poly(methyl)acrylates such as INFINEUM® V-351 (Infineum UK limited), PMA-D110 and PMA D; (i) a carbodiimide; (j) a synthetic ester; (k) poly alpha olefins (PAO); or (k) ester of estolides.
Optionally, other additives for increasing the oxidative stability of the isolated lipids can be admixed with the microbial oil, lubricant, or dielectric fluid produced by these methods. Examples of such additives include antioxidants such as tocopherols (vitamin E, e.g., alpha-, beta- and/or delta-tocopherol), ascorbic acid (vitamin C). Suitable antioxidants are commercially available. The BASF company markets a line of suitable phenol based and amine based antioxidants under the brand name IRGANOX®. IRGANOX L109, IRGANOX L64, IRGANOX L57, other IRGANOX antioxidants, and other phenol based and amine based compounds are suitable as antioxidant additives to the oils and products including dielectric fluids. Other nonlimiting examples of antioxidants include butylated hydroxy anisole (BHA), butylated hydroxy toluene (BHT), mono-tertiary butyl hydro quinone (TBHQ), butylated hydroanisole, tetrahydrobutrophenone, ascorbyl palmitate, and propyl gallate. In certain embodiments, a microbial oil-based product, e.g., a dielectric fluid, additionally includes an antioxidant at 0.1% to 5% by weight, and preferably at 0.5% to 2%.
Useful oxygen scavenging compounds include those commonly employed in the food packaging industry. Representative of the oxygen scavenging compounds useful in the practice of the invention include the following: sodium sulfite; copper sulfate pentahydrate; a combination of carbon and activated iron powder; mixtures of hydrosulfite, calcium hydroxide, sodium bicarbonate and activated carbon; a metal halide powder coated on the surface of a metal powder; and combinations of alkali compounds, such as calcium hydroxide, with sodium carbonate or sodium bicarbonate. Mixtures and combinations of one or more of the above compositions are also considered useful. Also useful as oxygen scavenging compounds are those compositions provided according to U.S. Pat. No. 2,825,651, which is incorporated by reference, including an oxygen remover composition comprising an intermixing of a sulfite salt and an accelerator such as hydrated copper sulfate, stannous chloride, or cobaltous oxide. Another useful class of oxygen scavenging compounds includes those compositions comprising a salt of manganese, iron, cobalt or nickel, an alkali compound, and a sulfite or deliquescent compound, such as disclosed by U.S. Pat. No. 4,384,972, which also is incorporated by reference. Preferred oxygen scavenging compounds include (or include as their base component) at least one basic iron oxide, such as a ferrous iron oxide, or are made of mixtures of iron oxide materials. Useful iron oxide-containing compositions are available commercially, for example, under the “Ageless” trade name from the Mitsubishi Gas Chemical Company of Duncan, S.C. and under the “Freshmax” trade name from Multisorb Technologies, Inc. of Buffalo, N.Y. Also useful are oxygen absorbing agents comprising a mixture of ferrous salts and an oxidation modifier and/or a metallic sulfite or sulfate compound.
Other additives that can be optionally added to the lipids for use as products such as spray oil, dielectric fluid, heat transfer fluid, release agent, lubricant, hydraulic fluid, surfactant, solvent, architectural coating, or a personal care product are deactivators for metal ions, corrosion inhibitors, anti-wear additives, and/or hydrolysis protectants. Some widely used additives are described in Schneider, 2006, J Science Food and Agriculture; 86: 1769-1780.). Metal ion deactivators (e.g., metal chelators) have two main functions. They suppress chemical attack on the surface of the metal and they also passivate the metal surface to suppress any residues that may act as catalysts for radical (unpaired electron) formation. Metal deactivators are commercially available. For example, the BASF company provides a line of metal deactivators, including the IRGAMET® line of metal deactivators. The RTVANDERBILT company sells the CUVAN® line of metal deactivators. Other examples of metal deactivators include derivatized triazoles including 1-(di-isooctylaminomethyl)-1,2,4-triazole, 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole, 1-(1-cyclohexyloxybutyl)tolyltriazole, 1-[bis(2-ethylhexyl)aminomethyl-4-methylbenzotriazole, derivatized borons including triethyl borate, tripropyl borate, triisopropyl borate, tributyl borate, tripentyl borate, trihexyl borate, tricyclohexyl borate, trioctyl borate, triisooctyl borate, and other derivatized hydrazine metal deactivator, e.g., 2′,3-bis[[3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyl]]proponiohydrazine, and the like. In certain embodiments, a microbial oil-based product of the present invention including spray oil, dielectric fluid, heat transfer fluid, release agent, lubricant, hydraulic fluid, surfactant, solvent, architectural coating, or a personal care product additionally includes one or more metal deactivators at 0.1% to 5% by weight, and preferably at 0.5% to 2%.
V. Cells with Exogenous Acyltransferases
In various embodiments of the present invention, one or more genes encoding an acyltransferase (an enzyme responsible for the condensation of a fatty acid with glycerol or a glycerol derivative to form an acylglyceride) can be introduced into an oleaginous cell (e.g., a plastidic microalgal cell) so as to alter the fatty acid composition of a natural oil produced by the cell. The genes may encode one or more of a glycerol-3-phosphate acyltransferase (GPAT), lysophosphatidic acid acyltransferase (LPAAT), also known as 1-acylglycerol-3-phosphate acyltransferase (AGPAT), phosphatidic acid phosphatase (PAP), or diacylglycerol acyltransferase (DGAT) that transfers an acyl group to the sn-3 position of DAG, thereby producing a TAG.
Recombinant nucleic acids may be integrated into a plasmid or chromosome of the cell. Alternately, the gene encodes an enzyme of a lipid pathway that generates TAG precursor molecules through fatty acyl-CoA-independent routes separate from that above. Acyl-ACPs may be substrates for plastidial GPAT and LPAAT enzymes and/or mitochondrial GPAT and LPAAT enzymes. Among further enzymes capable of incorporating acyl groups (e.g., from membrane phospholipids) to produce TAGs is phospholipid diacylglycerol acyltransferase (PDAT). Still further acyltransferases, including lysophosphosphatidylcholine acyltransferase (LPCAT), lysophosphosphatidylserine acyltransferase (LPSAT), lysophosphosphatidylethanolamine acyltransferase (LPEAT), and lysophosphosphatidylinositol acyltransferase (LPIAT), are involved in phospholipid synthesis and remodeling that may impact triglyceride composition.
The exogenous gene can encode an acyltransferase enzyme having preferential specificity for transferring an acyl substrate comprising a specific number of carbon atoms and/or a specific degree of saturation is introduced into a oleaginous cell so as to produce an oil enriched in a given regiospecific triglyceride. For example, the coconut (Cocos nucifera) lysophosphatidic acid acyltransferase has been demonstrated to prefer C12:0-CoA substrates over other acyl-CoA substrates (Knutzon et al., Plant Physiology, Vol. 120, 1999, pp 739-746), whereas the 1-acyl-sn-3-glycerol-3-phosphate acyltransferase of maturing safflower seeds shows preference for linoleoyl-CoA and oleoyl-CoA substrates over other acyl-CoA substrates, including stearoyl-CoA (Ichihara et al., European Journal of Biochemistry, Vol. 167, 1989, pp 339-347). Furthermore, acyltransferase proteins may demonstrate preferential specificity for one or more short-chain, medium-chain, or long-chain acyl-CoA or acyl-ACP substrates, but the preference may only be encountered where a particular, e.g. medium-chain, acyl group is present in the sn-1 or sn-3 position of the lysophosphatidic acid donor substrate. As a result of the exogenous gene, a TAG oil can be produced by the cell in which a particular fatty acid is found at the sn-2 position in greater than 20, 30, 40, 50, 60, 70, 90, or 90% of the TAG molecules.
In some embodiments of the invention, the cell makes an oil rich in saturated-unsaturated-saturated (sat-unsat-sat) TAGs. Sat-unsat-sat TAGS include 1,3-dihexadecanoyl-2-(9Z-octadecenoyl)-glycerol (referred to as 1-palmitoyl-2-oleyl-glycero-3-palmitoyl), 1,3-dioctadecanoyl-2-(9Z-octadecenoyl)-glycerol (referred to as 1-stearoyl-2-oleyl-glycero-3-stearoyl), and 1-hexadecanoyl-2-(9Z-octadecenoyl)-3-octadecanoy-glycerol (referred to as 1-palmitoyl-2-oleyl-glycero-3-stearoyl). These molecules are more commonly referred to as POP, SOS, and POS, respectively, where ‘P’ represents palmitic acid, ‘S’ represents stearic acid, and ‘O’ represents oleic acid. Further examples of saturated-unsaturated-saturated TAGs include MOM, LOL, MOL, COC and COL, where ‘M’ represents myristic acid, ‘L’ represents lauric acid, and ‘C’ represents capric acid (C8:0). Trisaturates, triglycerides with three saturated fatty acyl groups, are commonly sought for use in food applications for their greater rate of crystallization than other types of triglycerides. Examples of trisaturates include PPM, PPP, LLL, SSS, CCC, PPS, PPL, PPM, LLP, and LLS. In addition, the regiospecific distribution of fatty acids in a TAG is an important determinant of the metabolic fate of dietary fat during digestion and absorption.
According to certain embodiments of the present invention, oleaginous cells are transformed with recombinant nucleic acids so as to produce natural oils that comprise an elevated amount of a specified regiospecific triglyceride, for example 1-acyl-2-oleyl-glycero-3-acyl, or 1-acyl-2-lauric-glycero-3-acyl where oleic or lauric acid respectively is at the sn-2 position, as a result of introduced recombinant nucleic acids. Alternately, caprylic, capric, myristic, or palmitic acid may be at the sn-2 position. The amount of the specified regiospecific triglyceride present in the natural oil may be increased by greater than 5%, greater than 10%, greater than 15%, greater than 20%, greater than 25%, greater than 30%, greater than 35%, greater than 40%, greater than 50%, greater than 60%, greater than 70%, greater than 80%, greater than 90%, greater than 100-500%, or greater than 500% than in the natural oil produced by the microorganism without the recombinant nucleic acids. As a result, the sn-2 profile of the cell triglyceride may have greater than 10, 20, 30, 40, 50, 60, 70, 80, or 90% of the particular fatty acid.
The identity of the acyl chains located at the distinct stereospecific or regiospecific positions in a glycerolipid can be evaluated through one or more analytical methods known in the art (see Luddy et al., J. Am. Oil Chem. Soc., 41, 693-696 (1964), Brockerhoff, J. Lipid Res., 6, 10-15 (1965), Angers and Aryl, J. Am. Oil Chem. Soc., Vol. 76:4, (1999), Buchgraber et al., Eur. J. Lipid Sci. Technol., 106, 621-648 (2004)), or in accordance with Examples 1, 2, and 8 given below.
The positional distribution of fatty acids in a triglyceride molecule can be influenced by the substrate specificity of acyltransferases and by the concentration and type of available acyl moieties substrate pool. Nonlimiting examples of enzymes suitable for altering the regiospecificity of a triglyceride produced in a recombinant microorganism are listed in Tables 1-4. One of skill in the art may identify additional suitable proteins.







TABLE 1





Glycerol-3-phosphate acyltransferases and GenBank accession numbers.

















glycerol-3-phosphate acyltransferase
Arabidopsis
BAA00575



thaliana


glycerol-3-phosphate acyltransferase
Chlamydomonas
EDP02129



reinhardtii


glycerol-3-phosphate acyltransferase
Chlamydomonas
Q886Q7



reinhardtii


acyl-(acyl-carrier-protein):
Cucurbita moschata
BAB39688


glycerol-3-phosphate acyltransferase


glycerol-3-phosphate acyltransferase
Elaeis guineensis
AAF64066


glycerol-3-phosphate acyltransferase
Garcina
ABS86942



mangostana


glycerol-3-phosphate acyltransferase
Gossypium hirsutum
ADK23938


glycerol-3-phosphate acyltransferase
Jatropha curcas
ADV77219


plastid glycerol-3-phosphate
Jatropha curcas
ACR61638


acyltransferase


plastidial glycerol-phosphate
Ricinus communis
EEF43526


acyltransferase


glycerol-3-phosphate acyltransferase
Vica faba
AAD05164


glycerol-3-phosphate acyltransferase
Zea mays
ACG45812









Lysophosphatidic acid acyltransferases suitable for use with the microbes and methods of the invention include, without limitation, those listed in Table 2.







TABLE 2





Lysophosphatidic acid acyltransferases and GenBank accession numbers.

















1-acyl-sn-glycerol-3-
Arabidopsis thaliana
AEE85783


phosphate acyltransferase


1-acyl-sn-glycerol-3-
Brassica juncea
ABQ42862


phosphate acyltransferase


1-acyl-sn-glycerol-3-phosphate
Brassica juncea
ABM92334


acyltransferase


1-acyl-sn-glycerol-3-phosphate
Brassica napus
CAB09138


acyltransferase


lysophosphatidic acid
Chlamydomonas
EDP02300


acyltransferase
reinhardtii


lysophosphatidic acid
Limnanthes alba
AAC49185


acyltransferase


1-acyl-sn-glycerol-3-phosphate
Limnanthes douglasii
CAA88620


acyltransferase (putative)


acyl-CoA:sn-1-acylglycerol-3-
Limnanthes douglasii
ABD62751


phosphate acyltransferase


1-acylglycerol-3-phosphate
Limnanthes douglasii
CAA58239


O-acyltransferase


1-acyl-sn-glycerol-3-phosphate
Ricinus communis
EEF39377


acyltransferase









Diacylglycerol acyltransferases suitable for use with the microbes and methods of the invention include, without limitation, those listed in Table 3.







TABLE 3





Diacylglycerol acyltransferases and GenBank accession numbers.

















diacylglycerol acyltransferase
Arabidopsis
CAB45373



thaliana


diacylglycerol acyltransferase
Brassica juncea
AAY40784


putative diacylglycerol acyltransferase
Elaeis guineensis
AEQ94187


putative diacylglycerol acyltransferase
Elaeis guineensis
AEQ94186


acyl CoA:diacylglycerol acyltransferase
Glycine max
AAT73629


diacylglycerol acyltransferase
Helianthus annus
ABX61081


acyl-CoA:diacylglycerol
Olea europaea
AAS01606


acyltransferase 1


diacylglycerol acyltransferase
Ricinus communis
AAR11479









Phospholipid diacylglycerol acyltransferases suitable for use with the microbes and methods of the invention include, without limitation, those listed in Table 4.







TABLE 4





Phospholipid diacylglycerol acyltransferases and


GenBank accession numbers.

















phospholipid:diacylglycerol
Arabidopsis
AED91921


acyltransferase
thaliana


Putative phospholipid:diacylglycerol
Elaeis
AEQ94116


acyltransferase
guineensis


phospholipid:diacylglycerol
Glycine max
XP_003541296


acyltransferase 1-like


phospholipid:diacylglycerol
Jatropha
AEZ56255


acyltransferase
curcas


phospholipid:diacylglycerol
Ricinus
ADK92410


acyltransferase
communis


phospholipid:diacylglycerol
Ricinus
AEW99982


acyltransferase
communis









In an embodiment of the invention, known or novel LPAAT genes are transformed into the oleaginous cells so as to alter the fatty acid profile of triglycerides produced by those cells, most notably by altering the sn-2 profile of the triglycerides. For example, by virtue of expressing an exogenous active LPAAT in an oleaginous cell, the percent of unsaturated fatty acid at the sn-2 position is increased by 10, 20, 30, 40, 50, 60, 70, 80, 90% or more. For example, a cell may produce triglycerides with 30% unsaturates (which may be primarily 18:1 and 18:2 and 18:3 fatty acids) at the sn-2 position. In this example, introduction of the LPAAT activity increases the unsaturates at the sn-2 position by 20% so that 36% of the triglycerides comprise unsaturates at the sn-2 position. Alternately, an exogenous LPAAT can be used to increase mid-chain fatty acids including saturated mid-chains such as C8:0, C10:0, C12:0, C14:0 or C16:0 moieties at the sn-2 position. As a result, mid-chain levels in the overall fatty acid profile may be increased. Examples 43 and 44 describe altering the sn-2 and fatty acid profiles in an oleaginous microbe. As can be seen from those examples, the choice of LPAAT gene is important in that different LPAATs can cause a shift in the sn-2 and fatty acid profiles toward different acyl group chain-lengths or saturation levels. For example, the LPAAT of Example 43 increases C10-C14 fatty acids and the LPAAT of Example 44 causes an increase in C16 and C18 fatty acids. As in these examples, introduction of an exogenous LPAAT can be combined with introduction of exogenous acyl-ACP thioesterase. Combining a mid-chain preferring LPAAT and a mid-chain preferring FatB was found to give an additive effect; the fatty acid profile was shifted more toward the mid-chain fatty acids when both an exogenous LPAAT and FatB gene was present than when only an exogenous FatB gene was present. In a specific embodiment, the oil produced by a cell comprising an exogenous mid-chain specific LPAAT and (optionally) an exogenous FatB acyl-ACP thioesterase gene can have a fatty acid profile with 40, 50, 60, 70, 80% or more of C8:0, C10:0, C12:0, C14:0, or C16:0 fatty acids (separately or in sum).
Specific embodiments of the invention are a nucleic acid construct, a cell comprising the nucleic acid construct, a method of cultivating the cell to produce a triglyceride, and the triglyceride oil produced where the nucleic acid construct has a promoter operably linked to a novel LPAAT coding sequence. The coding sequence can have an initiation codon upstream and a termination codon downstream followed by a 3′ UTR sequence. In a specific embodiment, the LPAAT gene has LPAAT activity and a coding sequence have at least 75, 80, 85, 90, 95, 96, 97, 98 or 98% sequence identity to any of the cDNAs of SEQ ID NOs: 80 to 85 or a functional fragment thereof including equivalent sequences by virtue of degeneracy of the genetic code. Introns can be inserted into the sequence as well. Alternately, the LPAAT gene codes for the amino acid sequence of SEQ ID NOs 77-79 or functional fragments thereof, or a protein having at least 75, 80, 85, 90, 95, 96, 97, 98, or 99% amino acid sequence identity. Plants expressing the novel LPAAT are expressly included in the embodiments and can be produced using known genetic engineering techniques.
VI. Cells with Exogenous Elongases or Elongase Complex Enzymes
In various embodiments of the present invention, one or more genes encoding elongases or components of the fatty acyl-CoA elongation complex can be introduced into an oleaginous cell (e.g., a plastidic microalgal cell) so as to alter the fatty acid composition of the cell or of a natural oil produced by the cell. The genes may encode a beta-ketoacyl-CoA synthase (also referred to as 3-ketoacyl synthase, beta-ketoacyl synthase or KCS), a ketoacyl-CoA reductase, a hydroxyacyl-CoA dehydratase, enoyl-CoA reductase, or elongase. The enzymes encoded by these genes are active in the elongation of acyl-coA molecules liberated by acyl-ACP thioesterases. Recombinant nucleic acids may be integrated into a plasmid or chromosome of the cell. In a specific embodiment, the cell is of Chlorophyta, including heterotrophic cells such as those of the genus Prototheca. 
Beta-Ketoacyl-CoA synthase and elongase enzymes suitable for use with the microbes and methods of the invention include, without limitation, those listed in Table 5.
Table 5. Beta-Ketoacyl-CoA synthases and elongases listed with GenBank accession numbers.
Trypanosoma brucei elongase 3 (GenBank Accession No. AAX70673), Marchanita polymorpha (GenBank Accession No. AAP74370), Trypanosoma cruzi fatty acid elongase, putative (GenBank Accession No. EFZ33366), Nannochloropsis oculata fatty acid elongase (GenBank Accession No. ACV21066.1), Leishmania donovani fatty acid elongase, putative (GenBank Accession No. CBZ32733.1), Glycine max 3-ketoacyl-CoA synthase 11-like (GenBank Accession No. XP—003524525.1), Medicago truncatula beta-ketoacyl-CoA synthase (GenBank Accession No. XP—003609222), Zea mays fatty acid elongase (GenBank Accession No. ACG36525), Gossypium hirsutum beta-ketoacyl-CoA synthase (GenBank Accession No. ABV60087), Helianthus annuus beta-ketoacyl-CoA synthase (GenBank Accession No. ACC60973.1), Saccharomyces cerevisiae ELO1 (GenBank Accession No. P39540), Simmondsia chinensis beta-ketoacyl-CoA synthase (GenBank Accession No. AAC49186), Tropaeolum majus putative fatty acid elongase (GenBank Accession No. AAL99199, Brassica napus fatty acid elongase (GenBank Accession No. AAA96054)
In an embodiment of the invention, an exogenous gene encoding a beta-ketoacyl-CoA synthase or elongase enzyme having preferential specificity for elongating an acyl substrate comprising a specific number of carbon atoms and/or a specific degree of acyl chain saturation is introduced into a oleaginous cell so as to produce a cell or an oil enriched in fatty acids of specified chain length and/or saturation. Example 40 describes engineering of Prototheca strains in which exogenous fatty acid elongases with preferences for extending midchain fatty acyl-CoAs have been overexpressed to increase the concentration of stearate. Examples 42 and 54 describe engineering of Prototheca in which exogenous elongases or beta-ketoacyl-CoA synthases with preferences for extending monounsaturated and saturated C18- and C20-CoA substrates are overexpressed to increase the concentration of erucic acid.
In specific embodiments, the oleaginous cell produces an oil comprising greater than 0.5, 1, 2, 5, 10, 20, 30, 40, 50, 60 70, or 80% erucic and/or eicosenoic acid. Alternately, the cell produces an oil comprising 0.5-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, or 90-99% erucic or eicosenoic acid. The cell may comprise recombinant acids described above in connection with high-oleic oils with a further introduction of an exogenous beta-ketoacyl-CoA synthase that is active in elongating oleoyl-CoA. As a result of the expression of the exogenous beta-ketoacyl-CoA synthase, the natural production of erucic or eicosenoic acid by the cell can be increased by more than 2, 3, 4, 5, 10, 20, 30, 40, 50, 70, 100, 130, 170 or 200 fold. The high erucic and/or eicosenoic oil can also be a high stability oil; e.g., one comprising less than 5, 4, 3, 2, or 1% polyunsaturates and/or having the OSI values described in Section IV of this application and accompanying Examples. In a specific embodiment, the cell is a microalgal cell, optionally cultivated heterotrophically. As in the other embodiments, the oil/fat can be produced by genetic engineering of a plastidic cell, including heterotrophic microalgae of the phylum Chlorophyta, the class Trebouxiophytae, the order Chlorellales, or the family Chlorellacae. Preferably, the cell is oleaginous and capable of accumulating at least 40% oil by dry cell weight. The cell can be an obligate heterotroph, such as a species of Prototheca, including Prototheca moriformis or Prototheca zopfii. 
VII. Regiospecific and Stereospecific Oils/Fats
In an embodiment, a recombinant cell produces a natural fat or oil having a given regiospecific makeup. As a result, the cell can produce triglyceride fats having a tendency to form crystals of a given polymorphic form; e.g., when heated to above melting temperature and then cooled to below melting temperature of the fat. For example, the fat may tend to form crystal polymorphs of the β or β′ form (e.g., as determined by X-ray diffraction analysis), either with or without tempering. The fats may be ordered fats. In specific embodiments, the fat may directly from either β or β′ crystals upon cooling; alternatively, the fat can proceed through a β form to a β′ form. Such fats can be used as structuring laminating or coating fats for food applications. The natural fats can be incorporated into candy, dark or white chocolate, chocolate flavored confections, ice cream, margarines or other spreads, cream fillings, pastries, or other food products. Optionally, the fats can be semi-solid (at room temperature) yet free of artificially produced trans-fatty acids. Such fats can also be useful in skin care and other consumer or industrial products. PCT/US2013/037261 describes regiospecific triglycerides and their production.
As in the other embodiments, the fat can be produced by genetic engineering of a plastidic cell, including heterotrophic eukaryotic microalgae of the phylum Chlorophyta, the class Trebouxiophytae, the order Chlorellales, or the family Chlorellacae. Preferably, the cell is oleaginous and capable of accumulating at least 40% oil by dry cell weight. The cell can be an obligate heterotroph, such as a species of Prototheca, including Prototheca moriformis or Prototheca zopfii. The fats can also be produced in autotrophic algae or plants. Optionally, the cell is capable of using sucrose to produce oil and a recombinant invertase gene may be introduced to allow metabolism of sucrose, as described in PCT Publications WO2008/151149, WO2010/06032, WO2011/150410, WO2011/150411, and international patent application PCT/US12/23696. The invertase may be codon optimized and integrated into a chromosome of the cell, as may all of the genes mentioned here.
In an embodiment, the natural fat has at least 30, 40, 50, 60, 70, 80, or 90% fat of the general structure [saturated fatty acid (sn-1)-unsaturated fatty acid(sn-2)-saturated fatty acid(sn-3)]. This is denoted below as Sat-Unsat-Sat fat. In a specific embodiment, the saturated fatty acid in this structure is preferably stearate or palmitate and the unsaturated fatty acid is preferably oleate. As a result, the fat can form primarily β or β′ polymorphic crystals, or a mixture of these, and have corresponding physical properties, including those desirable for use in foods or personal care products. For example, the fat can melt at mouth temperature for a food product or skin temperature for a cream, lotion or other personal care product (e.g., a melting temperature of 30 to 40, or 32 to 35° C.). Optionally, the fats can have a 2 L or 3 L lamellar structure (e.g., as determined by X-ray diffraction analysis). Optionally, the fat can form this polymorphic form without tempering.
In a specific related embodiment, a natural fat triglyceride has a high concentration of SOS (i.e. triglyceride with stearate at the terminal sn-1 and sn-3 positions, with oleate at the sn-2 position of the glycerol backbone). For example, the fat can have triglycerides comprising at least 50, 60, 70, 80 or 90% SOS. In an embodiment, the fat has triglyceride of at least 80% SOS. Optionally, at least 50, 60, 70, 80 or 90% of the sn-2 linked fatty acids are unsaturated fatty acids. In a specific embodiment, at least 95% of the sn-2 linked fatty acids are unsaturated fatty acids. In addition, the SSS (tri-stearate) level can be less than 20, 10 or 5% and/or the C20:0 fatty acid (arachidic acid) level may be less than 6%, and optionally greater than 1% (e.g., from 1 to 5%). For example, in a specific embodiment, a natural fat produced by a recombinant cell has at least 70% SOS triglyceride with at least 80% sn-2 unsaturated fatty acyl moieties. In another specific embodiment, a natural fat produced by a recombinant cell has TAGs with at least 80% SOS triglyceride and with at least 95% sn-2 unsaturated fatty acyl moieties. In yet another specific embodiment, a natural fat produced by a recombinant cell has TAGs with at least 80% SOS, with at least 95% sn-2 unsaturated fatty acyl moieties, and between 1 to 6% C20 fatty acids.
In yet another specific embodiment, the sum of the percent stearate and palmitate in the fatty acid profile of the natural fat is twice the percentage of oleate, ±10, 20, 30 or 40% [e.g., (% P+% S) % O=2.0±20%]. Optionally, the sn-2 profile of this fat is at least 40%, and preferably at least 50, 60, 70, or 80% oleate (at the sn-2 position). Also optionally, this fat may be at least 40, 50, 60, 70, 80, or 90% SOS. Optionally, the fat comprises between 1 to 6% C20 fatty acids.
In any of these embodiments, the high SatUnsatSat fat may tend to form β′ polymorphic crystals. Unlike previously available plant fats like cocoa butter, the SatUnsatSat fat produced by the cell may form β′ polymorphic crystals without tempering. In an embodiment, the polymorph forms upon heating to above melting temperature and cooling to less that the melting temperature for 3, 2, 1, or 0.5 hours. In a related embodiment, the polymorph forms upon heating to above 60° C. and cooling to 10° C. for 3, 2, 1, or 0.5 hours.
In various embodiments the fat forms polymorphs of the β form, β′ form, or both, when heated above melting temperature and the cooled to below melting temperature, and optionally proceeding to at least 50% of polymorphic equilibrium within 5, 4, 3, 2, 1, 0.5 hours or less when heated to above melting temperature and then cooled at 10° C. The fat may form β′ crystals at a rate faster than that of cocoa butter.
Optionally, any of these fats can have less than 2 mole % diacylglycerol, or less than 2 mole % mono and diacylglycerols, in sum.
In an embodiment, the fat may have a melting temperature of between 30-60° C., 30-40° C., 32 to 37° C., 40 to 60° C. or 45 to 55° C. In another embodiment, the fat can have a solid fat content (SFC) of 40 to 50%, 15 to 25%, or less than 15% at 20° C. and/or have an SFC of less than 15% at 35° C.
The cell used to make the fat may include recombinant nucleic acids operable to modify the saturate to unsaturate ratio of the fatty acids in the cell triglyceride in order to favor the formation of SatUnsatSat fat. For example, a knock-out or knock-down of stearoyl-ACP desaturase (SAD) gene can be used to favor the formation of stearate over oleate or expression of an exogenous mid-chain-preferring acyl-ACP thioesterase can increase the levels mid-chain saturates. Alternately a gene encoding a SAD enzyme can be overexpressed to increase unsaturates.
In a specific embodiment, the cell has recombinant nucleic acids operable to elevate the level of stearate in the cell. As a result, the concentration of SOS may be increased. Example 9 demonstrates that the regiospecific profile of the recombinant microbe is enriched for the SatUnsatSat triglycerides POP, POS, and SOS as a result of overexpressing a Brassica napus C18:0-preferring thioesterase. An additional way to increase the stearate of a cell is to decrease oleate levels. For cells having high oleate levels (e.g., in excess of one half the stearate levels) one can also employ recombinant nucleic acids or classical genetic mutations operable to decrease oleate levels. For example, the cell can have a knockout, knockdown, or mutation in one or more FATA alleles, which encode an oleate liberating acyl-ACP thioesterase, and/or one or more alleles encoding a stearoyl ACP desaturase (SAD). Example 35 describes the inhibition of SAD2 gene product expression using hairpin RNA to produce a fatty acid profile of 37% stearate in Prototheca moriformis (UTEX 1435), whereas the wildtype strain produced less than 4% stearate, a more than 9-fold improvement. Moreover, while the strains of Example 35 are engineered to reduce SAD activity, sufficient SAD activity remains to produce enough oleate to make SOS, POP, and POS. See the TAG profiles of Example 47. In specific examples, one of multiple SAD encoding alleles may be knocked out and/or one or more alleles are downregulated using inhibition techniques such as antisense, RNAi, or siRNA, hairpin RNA or a combination thereof. In various embodiments, the cell can produce TAGs that have 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, or 90 to about 100% stearate. In other embodiments, the cells can produce TAGs that are 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, or 90 to about 100% SOS. Optionally, or in addition to genetic modification, stearoyl ACP desaturase can be inhibited chemically; e.g., by addition of sterculic acid to the cell culture during oil production.
Surprisingly, knockout of a single FATA allele has been found to increase the presence of C18 fatty acids produced in microalgae. By knocking out one allele, or otherwise suppressing the activity of the FATA gene product (e.g., using hairpin RNA), while also suppressing the activity of stearoyl-ACP desaturase (using techniques disclosed herein), stearate levels in the cell can be increased.
Another genetic modification to increase stearate levels includes increasing a ketoacyl ACP synthase (KAS) activity in the cell so as to increase the rate of stearate production. It has been found that in microalgae, increasing KASII activity is effective in increasing C18 synthesis and particularly effective in elevating stearate levels in cell triglyceride in combination with recombinant DNA effective in decreasing SAD activity. Recombinant nucleic acids operable to increase KASII (e.g., an exogenous KasII gene) can be also be combined with a knockout or knockdown of a FatA gene, or with knockouts or knockdowns of both a FatA gene and a SAD gene).
Optionally, the cell can include an exogenous stearate liberating acyl-ACP thioesterase, either as a sole modification or in combination with one or more other stearate-increasing genetic modifications. For example the cell may be engineered to overexpress an acyl-ACP thioesterase with preference for cleaving C18:0-ACPs. Example 9 describes the expression of exogenous C18:0-preferring acyl-ACP thioesterases to increase stearate in the fatty acid profile of the microalgae Prototheca moriformis (UTEX 1435) from about 3.7% to about 30.4% (over 8-fold). Example 41 provides additional examples of C18:0-preferring acyl-ACP thioesterases function to elevate C18:0 levels in Prototheca. Introduction of the acyl-ACP thioesterase can be combined with a knockout or knockdown of one or more endogenous acyl-ACP thioesterase alleles. Introduction of the thioesterase can also be combined with overexpression of an elonagase (KCS) or beta-ketoacyl-CoA synthase. In addition, one or more exogenous genes (e.g., encoding SAD or KASII) can be regulated via an environmental condition (e.g., by placement in operable linkage with a regulatable promoter). In a specific example, pH and/or nitrogen level is used to regulate an amt03 promoter. The environmental condition may then be modulated to tune the cell to produce the desired amount of stearate appearing in cell triglycerides (e.g., to twice the oleate concentration). As a result of these manipulations, the cell may exhibit an increase in stearate of at least 5, 10, 15, or 20 fold.
As a further modification alone or in combination with the other stearate increasing modifications, the cell can comprise recombinant nucleic acids operable to express an elongase or a beta-ketoacyl-CoA synthase. For example, overexpression of a C18:0-preferring acyl-ACP thioesterases may be combined with overexpression of a midchain-extending elongase or KCS to increase the production of stearate in the recombinant cell. One or more of the exogenous genes (e.g., enoding a thioesterase, elongase, or KCS) can be regulated via an environmental condition (e.g., by placement in operable linkage with a regulatable promoter). In a specific example, pH and/or nitrogen level is used to regulate an amt03 promoter. The environmental condition may then be modulated to tune the cell to produce the desired amount of stearate appearing in cell triglycerides (e.g., to twice the oleate concentration). As a result of these manipulations, the cell may exhibit an increase in stearate of at least 5, 10, 15, or 20 fold. In addition to stearate, arachidic, behenic, lignoceric, and cerotic acids may also be produced.
In specific embodiments, due to the genetic manipulations of the cell to increase stearate levels, the ratio of stearate to oleate in the oil produced by the cell is 3:1±30% (i.e., in the range of 2.7:1 to 3.3:1), 3:1±20% or 3:1±10%.
Alternately, the cell can be engineered to favor formation of SatUnsatSat where Sat is palmitate or a mixture of palmitate and stearate. In this case introduction of an exogenous palmitate liberating acyl-ACP thioesterase can promote palmitate formation. In this embodiment, the cell can produce triglycerides, that are at least 30, 40, 50, 60, 70, or 80% POP, or triglycerides in which the sum of POP, SOS, and POS is at least 30, 40, 50, 60, 70, 80, or 90% of cell triglycerides. In other related embodiments, the POS level is at least 30, 40, 50, 60, 70, 80, or 90% of the triglycerides produced by the cell.
In a specific embodiment, the melting temperature of the oil is similar to that of cocoa butter (about 30-32° C.). The POP, POS and SOS levels can approximate cocoa butter at about 16, 38, and 23% respectively. For example, POP can be 16%±20%, POS can be 38%±20%, and SOS can be 23%±20%. Or, POP can be 16%±15%, POS can be 38%±15%, an SOS can be 23%±15%. Or, POP can be 16%±10%, POS can be 38%±10%, an SOS can be 23%±10%.
As a result of the recombinant nucleic acids that increase stearate, a proportion of the fatty acid profile may be arachidic acid. For example, the fatty acid profile can be 0.01% to 5%, 0.1 to 4%, or 1 to 3% arachidic acid. Furthermore, the regiospecific profile may have 0.01% to 4%, 0.05% to 3%, or 0.07% to 2% AOS, or may have 0.01% to 4%, 0.05% to 3%, or 0.07% to 2% AOA. It is believed that AOS and AOA may reduce blooming and fat migration in confection comprising the fats of the present invention, among other potential benefits.
In addition to the manipulations designed to increase stearate and/or palmitate, and to modify the SatUnsatSat levels, the levels of polyunsaturates may be suppressed, including as described above by reducing delta 12 fatty acid desaturase activity (e.g., as encoded by a Fad gene) and optionally supplementing the growth medium or regulating FAD expression. It has been discovered that, in microalgae (as evidenced by work in Prototheca strains), polyunsaturates are preferentially added to the sn-2 position. Thus, to elevate the percent of triglycerides with oleate at the sn-2 position, production of linoleic acid by the cell may be suppressed. The techniques described herein, in connection with highly oxidatively stable oils, for inhibiting or ablating fatty acid desaturase (FAD) genes or gene products may be applied with good effect toward producing SatUnsatSat oils by reducing polyunsaturates at the sn-2 position. As an added benefit, such oils can have improved oxidatively stability. As also described herein, the fats may be produced in two stages with polyunsaturates supplied or produced by the cell in the first stage with a deficit of polyunsaturates during the fat producing stage. The fat produced may have a fatty acid profile having less than or equal to 15, 10, 7, 5, 4, 3, 2, 1, or 0.5% polyunsaturates. In a specific embodiment, the oil/fat produced by the cell has greater than 50% SatUnsatSat, and optionally greater than 50% SOS, yet has less than 3% polyunsaturates. Optionally, polyunsaturates can be approximated by the sum of linoleic and linolenic acid area % in the fatty acid profile.
In an embodiment, the natural fat is a Shea stearin substitute having 65% to 95% SOS and optionally 0.001 to 5% SSS. In a related embodiment, the fat has 65% to 95% SOS, 0.001 to 5% SSS, and optionally 0.1 to 8% arachidic acid containing triglycerides. In another related embodiment, the fat has 65% to 95% SOS and the sum of SSS and SSO is less than 10% or less than 5%.
The cell's regiospecific preference can be learned using the analytical method described below (Examples 1-2, 8). Despite balancing the saturates and unsaturates as describe above, it is possible that the cell enzymes do not place the unsaturated fatty acid at the sn-2 position. In this case, genetic manipulations can confer the desired regiospecificity by (i) reducing the activity of endogenous sn-2 specific acyl transferases (e.g., LPAAT) and/or (ii) introducing an exogenous LPAAT with the desired specificity (i.e., introduction of oleate at sn-2). Where an exogenous LPAAT is introduced, preferably the gene encoding the LPAAT is integrated into a host chromosome and is targeted to the endoplasmic reticulum. In some cases, the host cell may have both specific and non-specific LPAAT alleles and suppressing the activity of one of these alleles (e.g., with a gene knockout) will confer the desired specificity. For example, genes encoding the LPAATs of SEQ ID NO: 78 and SEQ ID NO: 79 or an LPAAT comprising at least 90, 95, 98, or 99% amino acid identity to either of these sequences, or a functional fragment thereof, can be used to add oleate to the sn-2 position in order to boost the levels of SatUnsatSat TAGs. The genes can have at least 80, 85, 90, 95, 96, 97, 98, or 99% nucleotide identity to any of SEQ ID NOs: 80 to 85 or equivalent sequences by virtue of the degeneracy of the genetic code. These genes can be manifest as recombinant nucleic acid constructs, vectors, chromosomes or host cells comprising these sequences or functional fragments thereof, which can be found by systematic deletion of nucleic acid from the sequences using known techniques. As a result of expression of the genes, the amount of sat-unsat-sat TAGs such as SOS, POS, POP, or triglycerides with C8 to C16 fatty acids at the sn-2 position can be increased in a host cell.
In an embodiment, fats produced by cells according to the invention are used to produce a confection, candy coating, or other food product. As a result, a food product like a chocolate or candy bar may have the “snap” (e.g., when broken) of a similar product produced using cocoa butter. The fat used may be in a beta polymorphic form or tend to a beta polymorphic form. In an embodiment, a method includes adding such a fat to a confection. Optionally, the fat can be a cocoa butter equivalent per EEC regulations, having greater than 65% SOS, less than 45% unsaturated fatty acid, less than 5% polyunsaturated fatty acids, less than 1% lauric acid, and less than 2% trans fatty acid. The fats can also be used as cocoa butter extenders, improvers, replacers, or anti-blooming agents, or as Shea butter replacers, including in food and personal care products. High SOS fats produced using the cells and methods disclosed here can be used in any application or formulation that calls for Shea butter or Shea fraction. However, unlike Shea butter, fats produced by the embodiments of the invention can have low amounts of unsaponifiables; e.g. less than 7, 5, 3, or 2% unsaponifiables. In addition, Shea butter tends to degrade quickly due to the presence of diacylglycerides whereas fats produced by the embodiments of the invention can have low amounts of diacylglycerides; e.g., less than 5, 4, 3, 2, 1, or 0.5% diacylglycerides.
In an embodiment of the invention there is a natural fat suitable as a shortening, and in particular, as a roll-in shortening. Thus, the shortening may be used to make pastries or other multi-laminate foods. The shortening can be produced using methods disclosed herein for producing engineered organisms and especially heterotrophic microalgae. In an embodiment, the shortening has a melting temperature of between 40 to 60° C. and preferably between 45-55° C. and can have a triglyceride profile with 15 to 20% medium chain fatty acids (C8 to C14), 45-50% long chain saturated fatty acids (C16 and higher), and 30-35% unsaturated fatty acids (preferably with more oleic than linoleic). The shortening may form β′ polymorphic crystals, optionally without passing through the β polymorphic form. The shortening may be thixotropic. The shortening may have a solid fat content of less than 15% at 35° C. In a specific embodiment, there is a natural oil suitable as a roll-in shortening produced by a recombinant microalga, where the oil has a yield stress between 400 and 700 or 500 and 600 Pa and a storage modulus of greater than 1×105 Pa or 1×106 Pa. (see Example 46)
A structured solid-liquid fat system can be produced using the structuring oils by blending them with an oil that is a liquid at room temperature (e.g., an oil high in tristearin or triolein). The blended system may be suitable for use in a food spread, mayonnaise, dressing, shortening; i.e. by forming an oil-water-oil emulsion. The structuring fats according to the embodiments described here, and especially those high in SOS, can be blended with other oils/fats to make a cocoa butter equivalent, replacer, or extender. For example, a natural fat having greater than 65% SOS can be blended with palm mid-fraction to make a cocoa butter equivalent.
In general, such high Sat-Unsat-Sat fats or fat systems can be used in a variety of other products including whipped toppings, margarines, spreads, salad dressings, baked goods (e.g. breads, cookies, crackers muffins, and pastries), cheeses, cream cheese, mayonnaise, etc.
In a specific embodiment, a Sat-Unsat-Sat fat described above is used to produce a margarine, spread, or the like. For example, a margarine can be made from the fat using any of the recipes or methods found in U.S. Pat. Nos. 7,118,773, 6,171,636, 4,447,462, 5,690,985, 5,888,575, 5,972,412, 6,171,636, or international patent publications WO9108677A1.
In an embodiment, a fat comprises a natural (e.g., from microalgal cells) fat optionally blended with another fat and is useful for producing a spread or margarine or other food product is produced by the genetically engineered cell and has glycerides derived from fatty acids which comprises:

    
    
        (a) at least 10 weight % of C18 to C24 saturated fatty acids,
        (b) which comprise stearic and/or arachidic and/or behenic and/or lignoceric acid and
        (c) oleic and/or linoleic acid, while
        (d) the ratio of saturated C18 acid/saturated (C20+C22+C24)-acids ≧1, preferably ≧5, more preferably ≧10, which glycerides contain:
        (e) ≦5 weight % of linolenic acid calculated on total fatty acid weight
        (f) ≦5 weight % of trans fatty acids calculated on total fatty acid weight
        (g) ≦75 weight %, preferably <60 weight % of oleic acid at the sn-2 position: which glycerides contain calculated on total glycerides weight
        (h) ≧8 weight % HOH+HHO triglycerides
        (i) ≦5 weight % of trisaturated triglycerides, and optionally one or more of the following properties:
        (j) a solid fat content of >10% at 10° C.
        (k) a solid fat content ≦15% at 35° C.,
        (l) a solid fat content of >15% at 10° C. and a solid fat content <25% at 35° C.,
        (m) the ratio of (HOH+HHO) and (HLH+HHL) triglycerides is >1, and preferably >2,
        
            where H stands for C18-C24 saturated fatty acid, O for oleic acid, and L for linoleic acid.
        
        
    
    


Optionally, the solid content of the fat (% SFC) is 11 to 30 at 10° C., 4 to 15 at 20° C., 0.5 to 8 at 30° C., and 0 to 4 at 35° C. Alternately, the % SFC of the fat is 20 to 45 at 10° C., 14 to 25 at 20° C., 2 to 12 at 30° C., and 0 to 5 at 35° C. In related embodiment, the % SFC of the fat is 30 to 60 at 10° C., 20 to 55 at 20° C., 5 to 35 at 30° C., and 0 to 15 at 35° C. The C12-C16 fatty acid content can be ≦15 weight %. The fat can have ≦5 weight % disaturated diglycerides.
In related embodiments there is a spread, margarine or other food product made with the natural oil or natural oil blend. For example, the natural fat can be used to make an edible W/O (water/oil) emulsion spread comprising 70-20 wt. % of an aqueous phase dispersed in 30-80 wt. % of a fat phase which fat phase is a mixture of 50-99 wt. % of a vegetable triglyceride oil A and 1-50 wt. % of a structuring triglyceride fat B, which fat consists of 5-100 wt. % of a hardstock fat C and up to 95 wt. % of a fat D, where at least 45 wt. % of the hardstock fat C triglycerides consist of SatOSat triglycerides and where Sat denotes a fatty acid residue with a saturated C18-C24 carbon chain and O denotes an oleic acid residue and with the proviso that any hardstock fat C which has been obtained by fractionation, hydrogenation, esterification or interesterification of the fat is excluded. The hardstock fat can be a natural fat produced by a cell according to the methods disclosed herein. Accordingly, the hardstock fat can be a fat having a regiospecific profile having at least 50, 60, 70, 80, or 90% SOS. The W/O emulsion can be prepared to methods known in the art including in U.S. Pat. No. 7,118,773.
In related embodiment, the cell also expresses an endogenous hydrolyase enzyme that produces ricinoleic acid. As a result, the oil (e.g., a liquid oil or structured fat) produced may be more easily emulsified into a margarine, spread, or other food product or non-food product. For example, the oil produced may be emulsified using no added emulsifiers or using lower amounts of such emulsifiers. The U.S. patent application Ser. No. 13/365,253 discloses methods for expressing such hydroxylases in microalgae and other cells. In specific embodiments, a natural oil comprises at least 1, 2, or 5% SRS, where S is stearate and R is ricinoleic acid.
In an alternate embodiment, a natural oil that is a cocoa butter mimetic as described above can be fractionated to remove trisaturates (e.g., tristearin and tripalmitin, SSP, and PPS). For example, it has been found that microalgae engineered to decrease SAD activity to increase SOS concentration make an oil that can be fractionated to remove trisaturated. See Example 47. In specific embodiments, the melting temperature of the fractionated natural oil is similar to that of cocoa butter (about 30-32° C.). The POP, POS and SOS levels can approximate cocoa butter at about 16, 38, and 23% respectively. For example, POP can be 16%±20%, POS can be 38%±20%, an SOS can be 23%±20%. Or, POP can be 16%±15%, POS can be 38%±15%, an SOS can be 23%±15%. Or, POP can be 16%±10%, POS can be 38%±10%, an SOS can be 23%±10%. In addition, the tristearin levels can be less than 5% of the triacylglycerides.
VIII. High Mid-Chain Oils
In an embodiment of the present invention, the cell has recombinant nucleic acids operable to elevate the level of midchain fatty acids (e.g., C8:0, C10:0, C12:0, C14:0, or C16:0 fatty acids) in the cell or in the oil of the cell. One way to increase the levels of midchain fatty acids in the cell or in the oil of the cell is to engineer a cell to express an exogenous acyl-ACP thioesterase that has activity towards midchain fatty acyl-ACP substrates (e.g., one encoded by a FatB gene), either as a sole modification or in combination with one or more other genetic modifications. An additional genetic modification to increase the level of midchain fatty acids in the cell or oil of the cell is the expression of an exogenous lysophosphatidic acid acyltransferase gene encoding an active lysophosphatidic acid acyltransferase (LPAAT) that catalyzes the transfer of a mid-chain fatty-acyl group to the sn-2 position of a substituted acylglyceroester. In a specific related embodiment, both an exogenous acyl-ACP thioesterase and LPAAT are stably expressed in the cell. In an embodiment, recombinant nucleic acids are introduced into an oleaginous cell (and especially into a plastidic microbial cell) that cause expression of an exogenous mid-chain-specific thioesterase and an exogenous LPAAT that catalyzes the transfer of a mid-chain fatty-acyl group to the sn-2 position of a substituted acylglyceroester. As a result, the cell can be made to increase the percent of a midchain fatty acid in the TAGs that it produces by 10, 20 30, 40, 50, 60, 70, 80, 90-fold, or more. Introduction of the exogenous LPAAT can increase midchain fatty acids at the sn-2 position by 1.2, 1.5, 1.7, 2, 3, 4 fold or more compared to introducing an exogenous mid-chain preferring acyl-ACP thioesterase alone. In an embodiment, the mid-chain fatty acid is greater than 30, 40, 50 60, 70, 80, or 90% of the TAG fatty acids produced by the cell. In various embodiments, the mid-chain fatty acid is lauric, myristic, or palmitic. Examples 3, 43, and 44 describe expression of plant LPAATs in microalgal cells with resulting alterations in fatty acid profiles. As in the examples, the cells can also express an exogenous acyl-ACP thioesterase (which can also be from a plant) with a preference for a given fatty acyl-ACP chain length. For example, a microalgal cell can comprise exogenous genes encoding a LPAAT and an acyl-ACP thioesterase that preferentially cleave C8, C10, C12, C14, C8-C12, or C8-C10 fatty acids. In a specific embodiment, such a cell is capable of producing a natural oil with a fatty acid profile comprising 10-20, 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, or 90-99%, >20%, >30%, >40%, >50%, >60%, >70%, >80% or >90% C8, C10, C12, C14, C8-C12, or C8-C10 fatty acids. Other LPAATs can preferentially cleave C16 or C18 fatty acids (see Example 44). Further genetic manipulation of the fatty acid desaturase pathway (e.g., as described infra) can increase the stability of the oils.
Any of these natural oils can be interesterified. Interesterification can, for example, be used to lower the melting temperature or pour-point of the oil. In a specific embodiment, the natural oil comprises at least 50% of the sum of caprylic and capric acids and may be interesterified to reduce the pour point and/or kinematic viscosity. Such an oil (natural or interesterified) can optionally be a high stability oil comprising, for example, less than 2% polyunsaturated fatty acids.
Alternately, or in addition to expression of an exogenous LPAAT, the cell may comprise recombinant nucleic acids that are operable to express an exogenous KASI or KASIV enzyme and optionally to decrease or eliminate the activity of a KASII, which is particularly advantageous when a mid-chain-preferring acyl-ACP thioesterase is expressed. Example 37 describes the engineering of Prototheca cells to overexpress KASI or KASIV enzymes in conjunction with a mid-chain preferring acyl-ACP thioesterase to generate strains in which production of C10-C12 fatty acids is about 59% of total fatty acids. Mid-chain production can also be increased by suppressing the activity of KASI and/or KASII (e.g., using a knockout or knockdown). Example 38 details the chromosomal knockout of different alleles of Prototheca moriformis (UTEX 1435) KASI in conjunction with overexpression of a mid-chain preferring acyl-ACP thioesterase to achieve fatty acid profiles that are about 76% or 84% C10-C14 fatty acids. Example 39 provides recombinant cells and oils characterized by elevated midchain fatty acids as a result of expression of KASI RNA hairpin polynucleotides. In addition to any of these modifications, unsaturated or polyunsaturated fatty acid production can be suppressed (e.g., by knockout or knockdown) of a SAD or FAD enzyme.
In a particular embodiment, a recombinant cell produces TAG having 40% lauric acid or more. In another related embodiment, a recombinant cell produces TAG having a fatty acid profile of 40% or more of myristic, caprylic, capric, or palmitic acid. For example, an oleaginous recombinant clorophyte cell can produce 40% lauric or myristic acid in an oil that makes up 40, 50, or 60% or more of the cell's dry weight.
In a specific embodiment, a recombinant cell comprises nucleic acids operable to express a product of an exogenous gene encoding a lysophosphatidic acid acyltransferase that catalyzes the transfer of a mid-chain fatty-acyl group to the sn-2 position of a substituted acylglyceroester and nucleic acids operable to express a product of an acyl-ACP thioesterase exogenous gene encoding an active acyl-ACP thioesterase that catalyzes the cleavage of mid-chain fatty acids from ACP. As a result, in one embodiment, the oil produced can be characterized by a fatty acid profile elevated in C10 and C12 fatty acids and reduced in C16, C18, and C18:1 fatty acids as a result of the recombinant nucleic acids. See Example 3, in which overexpression of a Cuphea wrightii acyl-ACP thioesterase and a Cocos nucifera LPAAT gene increased the percentage of C12 fatty acids from about 0.04% in the untransformed cells to about 46% and increased the percentage of C10 fatty acids from about 0.01% in the untransformed cells to about 11%. In related embodiments, the increase in midchain fatty acid production is greater than 70%, from 75-85%, from 70-90%, from 90-200%, from 200-300%, from 300-400%, from 400-500%, or greater than 500%.
Average chain length can also be reduced by overexpression of a C18-specific acyl-ACP thioesterase. Recombinant nucleic acids operable to overexpress a C18 or other acyl-ACP thioesterase may be used alone or in combination with the other constructs described here to further reduce average chain length. Among other uses, the oils produced can be used as cocoa-butter/milk fat substitute. See Example 45 and the discussion of FIG. 17. In an embodiment, one of the above described high mid-chain producing cells is further engineered to produce a low polyunsaturated oil by knocking out or knocking down one or more fatty acyl desaturases, as described above in section IV. Accordingly, the oil produced can have the high stability characteristic mentioned in that section or in corresponding Examples. In a specific embodiment, the cell produces an oil comprising greater than 30% midchain fatty acids and 5% or less polyunsaturates. In a related embodiment, the cell produces an oil comprising greater than 40% midchain fatty acids and 4% or less polyunsaturates. In a further related embodiment, the cell produces an oil comprising greater than 50% midchain fatty acids and 3% or less polyunsaturates.
The high mid-chain oils or fatty acids derived from hydrolysis of these oils may be particularly useful in food, fuel and oleochemical applications including the production of lubricants and surfactants. For example, fatty acids derived from the cells can be esterified, cracked, reduced to an aldehyde or alcohol, aminated, sulfated, sulfonated, or subjected to other chemical process known in the art.
In some embodiments, the natural oil is interesterified and the kinematic viscosity of the interesterified natural oil is less than 30, 20, 15, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1 centiStokes at 40° C. In some embodiments, the kinematic viscosity is less than 3 centiStokes at 40° C. In some embodiments, the pour point of an interesterified natural oil is less than, 5° C., 0° C., −10° C., −12° C., −15° C., −20° C., −25° C., −30° C., −35° C., −40° C., −45° C., or −50° C. In some embodiments, the pour point is less than −10° C. In some embodiments, the pour point is less than −20° C.
Example 53 describes the use of a plant FatB gene in algae to produce oils in microalgae with greater than 60% myristate. In an embodiment, a gene encoding a protein having at least 90, 95, 96, 97, 98, or 99% amino acid identity to SEQ ID NO:87 or SEQ ID NO:89 is used, optionally in combination with a mid-chain preferred LPAAT as described above.
IX. High Oleic/Palmitic Oil
In another embodiment, there is a high oleic oil with about 60% oleic acid, 25% palmitic acid and optionally 5% polyunsaturates or less. The high oleic oil can be produced using the methods disclosed in U.S. patent application Ser. No. 13/365,253, which is incorporated by reference in relevant part. For example, the cell can have nucleic acids operable to suppress an acyl-ACP thioesterase (e.g., knockout or knockdown of a gene encoding FATA) while also expressing an gene that increases KASII activity. The cell can have further modifications to inhibit expression of delta 12 fatty acid desaturase, including regulation of gene expression as described above. As a result, the polyunsaturates can be less than or equal to 5, 4, 3, 2, or 1 area %.
X. Low Saturate Oil
In an embodiment, a natural oil is produced from a recombinant cell. The oil produced has a fatty acid profile that has less that 4%, 3%, 2%, or 1% (area %), saturated fatty acids. In a specific embodiment, the oil has 0.1 to 3.5% saturated fatty acids. Certain of such oils can be used to produce a food with negligible amounts of saturated fatty acids. Optionally, these oils can have fatty acid profiles comprising at least 90% oleic acid or at least 90% oleic acid with at least 3% polyunsaturated fatty acids. In an embodiment, a natural oil produced by a recombinant cell comprises at least 90% oleic acid, at least 3% of the sum of linoleic and linolenic acid and has less than 3.5% saturated fatty acids. In a related embodiment, a natural oil produced by a recombinant cell comprises at least 90% oleic acid, at least 3% of the sum of linoleic and linolenic acid and has less than 3.5% saturated fatty acids, the majority of the saturated fatty acids being comprised of chain length 10 to 16. These oils may be produced by recombinant oleaginous cells including but not limited to those described here and in U.S. patent application Ser. No. 13/365,253. For example, overexpression of a KASII enzyme in a cell with a highly active SAD can produce a high oleic oil with less than or equal to 3.5% saturates. Optionally, an oleate-specific acyl-ACP thioesterase is also overexpressed and/or an endogenous thioesterase having a propensity to hydrolyze acyl chains of less than C18 knocked out or suppressed. The oleate-specific acyl-ACP thioesterase may be a transgene with low activity toward ACP-palmitate and ACP-stearate so that the ratio of oleic acid relative to the sum of palmitic acid and stearic acid in the fatty acid profile of the oil produced is greater than 3, 5, 7, or 10. Alternately, or in addition, a FATA gene may be knocked out or knocked down, as in Example 36 below. A FATA gene may be knocked out or knocked down and an exogenous KASII overexpressed. Another optional modification is to increase KASI and/or KASIII activity, which can further suppress the formation of shorter chain saturates. Optionally, one or more acyltransferases (e.g., an LPAAT) having specificity for transferring unsaturated fatty acyl moieties to a substituted glycerol is also overexpressed and/or an endogenous acyltransferase is knocked out or attenuated. An additional optional modification is to increase the activity of KCS enzymes having specificity for elongating unsaturated fatty acids and/or an endogenous KCS having specificity for elongating saturated fatty acids is knocked out or attenuated. Optionally, oleate is increased at the expense of linoleate production by knockout or knockdown of a delta 12 fatty acid desaturase; e.g., using the techniques of Section IV of this patent application. Optionally, the exogenous genes used can be plant genes; e.g., obtained from cDNA derived from mRNA found in oil seeds.
As described in Example 51, levels of saturated fats may also be reduced by introduction of an exogenous gene (e.g. a plant gene) that desaturates palmitic acid to palmitoleic acid. Examples of suitable genes for use in the oleaginous cells are found in the plants, including Macfadyena unguis (Cat's claw), Macadamia integrifolia (Macadamia nut) and Hippophae rhamnoides (sea buckthorn). Variant exogenous or endogenous SADs that desaturate palmitoyl-ACP can also be used and are further discussed in Example 51. Optionally, the PAD or SAD gene has at least 95% amino acid sequence identity to the gene product described in Example 51. This modification can be used alone, or in combination with oleate-increasing modifications such as those described immediately above, in section 1× and in the Examples, including knockout or knockdown of one or more endogenous FATA alleles and/or overexpression of KASII. In one embodiment, an oleaginous cell such as an oleaginous microalgae has a combination of (i) a FATA knockout or knockdown with (ii) expression of an exogenous PAD gene (this could also be a variant SAD with PAD activity, see Example 55) and/or a mutation in an endogenous SAD gene to give PAD activity. Such as cell may further comprise an overexpressed endogenous or exogenous KASII gene. In accordance with any of these embodiments of the invention, the oleaginous cell produces an oil having a fatty acid profile with 1-2, 2-3, 3-4, 5-6, 7-8, 9-10, 10-15, 15-20, 20-30, 30-40, 40-60, 60-70, 70-80, 80-90, or 90-100 area percent palmitoleic acid. In a specific embodiment, the cell produces greater than 50% oleic acid, greater than 1% palmitoleic acid, and 3.5 area % or less of saturated fatty acids.
In addition to the above genetic modifications, the low saturate oil can be a high-stability oil by virtue of low amounts of polyunsaturated fatty acids. Methods and characterizations of high-stability, low-polyunsaturated oils are described in the section above entitled Low Polyunsaturated Oils, including method to reduce the activity of endogenous 412 fatty acid desaturase. In a specific embodiment, an oil is produced by a oleaginous microbial cell having a type II fatty acid synthetic pathway and has no more than 3.5% saturated fatty acids and also has no more than 3% polyunsaturated fatty acids. In another specific embodiment, the oil has no more than 3% saturated fatty acids and also has no more than 2% polyunsaturated fatty acids. In another specific embodiment, the oil has no more than 3% saturated fatty acids and also has no more than 1% polyunsaturated fatty acids.
The low saturate and low saturate/high stability oil can be blended with less expensive oils to reach a targeted saturated fatty acid level at less expense. For example, an oil with 1% saturated fat can be blended with an oil having 7% saturated fat (e.g. high-oleic sunflower oil) to give an oil having 3-5% or less saturated fat.
Oils produced according to embodiments of the present invention can be used in the transportation fuel, oleochemical, and/or food and cosmetic industries, among other applications. For example, transesterification of lipids can yield long-chain fatty acid esters useful as biodiesel. Other enzymatic and chemical processes can be tailored to yield fatty acids, aldehydes, alcohols, alkanes, and alkenes. In some applications, renewable diesel, jet fuel, or other hydrocarbon compounds are produced. The present disclosure also provides methods of cultivating microalgae for increased productivity and increased lipid yield, and/or for more cost-effective production of the compositions described herein. The methods described here allow for the production of oils from plastidic cell cultures at large scale; e.g., 1000, 10,000, 100,000 liters or more.
In an embodiment, an oil extracted from the cell has 3.5%, 3%, 2.5%, or 2% saturated fat or less and is incorporated into a food product. The finished food product has 3.5, 3, 2.5, or 2% saturated fat or less.
XI. Cocoa Butter/Milk-Fat Blend Mimetics
In certain embodiments, the cell produces a natural oil that has a temperature-dependent solid fat content (“SFC-curve”) that approximates a blend of cocoa butter and milk fat. Such oils may be used where the cocoa butter/milk fat blend could be used; for example, in chocolates other confections, ice cream or other frozen desserts, pastries, or dough, including for quickbreads, or other baked goods. The oils may inhibit blooming, enhance flavor, enhance texture, or reduce costs. In a specific example, the natural oil approximates. Accordingly, an embodiment of the invention is using a natural oil from a recombinant microalgal cell to replace a cocoa butter/milfat blend in a recipe. In a related embodiment,
FIG. 17 shows a plot of % solid fat content for various oils as follows (a) P. moriformis RBD oil without lipid pathway engineering, (b) Brazilian cocoa butter +25% milk fat, (c) three replicates of P. moriformis RBD oil from a strain expressing hairpin nucleic acids that reduce levels of a SAD allele thus reducing oleic acid and increasing stearic acid in the TAG profile, (d) P. moriformis RBD oil from a strain overexpressing an endogenous OTE (oleoyl acyl-ACP thioesterase, see Example 45), (e) Malaysian cocoa butter +25% milk fat, and (f) Malaysian cocoa butter. The cocoa butter and cocoa butter milk fat values are literature values (Bailey's Industrial Oils and Fat Products, 6th ed.)
In an embodiment of the present invention, a natural oil that is similar in thermal properties to a 75% cocoa butter/25% milk fat blend is produced by a microalgal or other cell described above. The cell comprises recombinant nucleic acids operable to alter the fatty acid profile of triglycerides produced by the cell so as that the oil has a solid fat content (e.g., as determined by NMR) of 38%±30% at 20° C., 32%±30% at 25° C., 17%±30% at 30° C., and less than 5%±30% at 35° C. For the sake of clarity, ±10% refers to percent of the percent SFC (e.g., 30% of 5% SFC is 1.5% SFC so the range is 3.5 to 6.5% SFC at 35° C.). In related embodiments, the oil has a solid fat content (e.g., as determined by NMR) of 38%±20% at 20° C., 32%±20% at 25° C., 17%±20% at 30° C., and less than 5%±20% at 35° C. or the oil has a solid fat content (e.g., as determined by NMR) of 38%±10% at 20° C., 32%±10% at 25° C., 17%±10% at 30° C., and less than 5%±10% at 35° C.
XII. Minor Oil Components
The oils produced according to the above methods in some cases are made using a microalgal host cell. As described above, the microalga can be, without limitation, fall in the classification of Chlorophyta, Trebouxiophyceae, Chlorellales, Chlorellaceae, or Chlorophyceae. It has been found that microalgae of Trebouxiophyceae can be distinguished from vegetable oils based on their sterol profiles. Oil produced by Chlorella protothecoides was found to produce sterols that appeared to be brassicasterol, ergosterol, campesterol, stigmasterol, and β-sitosterol, when detected by GC-MS. This method of detection generally does not distinguish between the two possible stereoisomers at C-24 in the absence of special conditions. However, sterols produced by green algae (e.g. Chlorophyta and specifically Chlorella) have a C24β stereochemistry (J. K. Volkman, Appl. Microbiotechnol. “Sterols in Microorganisms”, 2003, 60:495-506). Thus, molecules detected as campesterol, stigmasterol, and β-sitosterol, are actually their C24 epimers 22,23-dihydrobrassicasterol, poriferasterol and clionasterol, respectively.













Stereoisomer



Sterol
(common name)
Systematic name*







24-methylcholest-
Campesterol
(24R)-24-methylcholest-




5-en-3β-ol


5-en-3-ol
22,23-dihydrobrassicasterol
(24S)-24-methylcholest-



(Δ5-ergostenol)
5-en-3β-ol


24-ethylcholest-
β-Sitosterol
(24R)-24-ethylcholest-




5-en-3β-ol


5-en-3-ol
Clionasterol
(24S)-24-ethylcholest-




5-en-3β-ol


5,22-
Stigmasterol
(24S)-24-ethylcholesta-


cholestadien-

5,22-dien-3β-ol


24-ethyl-3-ol
Poriferasterol
(24R)-24-ethylcholesta-




5,22-dien-3β-ol





*In the nomenclature, 24α = 24(R) and 24β = 24(S) when side chain is saturated; 24α = 24(S) and 24β = 24(R) when side chain contains a Δ22 double bond.






Thus, the oils produced by the microalgae described above can be distinguished from plant oils by the presence of sterols with C24β stereochemistry and the absence of C24α stereochemistry in the sterols present. For example, the oils produced may contain 22, 23-dihydrobrassicasterol while lacking campesterol; contain clionasterol, while lacking in β-sitosterol, and/or contain poriferasterol while lacking stigmasterol. Alternately, or in addition, the oils may contain significant amounts of Δ7-poriferasterol.

In one embodiment, the oils provided herein are not vegetable oils. Vegetable oils are oils extracted from plants and plant seeds. Vegetable oils can be distinguished from the non-plant oils provided herein on the basis of their oil content. A variety of methods for analyzing the oil content can be employed to determine the source of the oil or whether adulteration of an oil provided herein with an oil of a different (e.g. plant) origin has occurred. The determination can be made on the basis of one or a combination of the analytical methods. These tests include but are not limited to analysis of one or more of free fatty acids, fatty acid profile, total triacylglycerol content, diacylglycerol content, peroxide values, spectroscopic properties (e.g. UV absorption), sterol profile, sterol degradation products, antioxidants (e.g. tocopherols), pigments (e.g. chlorophyll), d13C values and sensory analysis (e.g. taste, odor, and mouth feel). Many such tests have been standardized for commercial oils such as the Codex Alimentarius standards for edible fats and oils.
Sterols contain from 27 to 29 carbon atoms (C27 to C29) and are found in all eukaryotes. Animals exclusively make C27 sterols as they lack the ability to further modify the C27 sterols to produce C28 and C29 sterols. Plants, however, are able to synthesize C28 and C29 sterols, and C28/C29 plant sterols are often referred to as phytosterols. The sterol profile of a given plant is high in C29 sterols, and the primary sterols in plants are typically the C29 sterols β-sitosterol and stigmasterol. In contrast, the sterol profile of non-plant organisms contains greater percentages of C27 and C28 sterols. For example, the sterols in fungi and in many microalgae are principally C28 sterols. The sterol profile and particularly the striking predominance of C29 sterols over C28 sterols in plants has been exploited for determining the proportion of plant and marine matter in soil samples (Huang, Wen-Yen, Meinschein W. G., “Sterols as ecological indicators”; Geochimica et Cosmochimia Acta. Vol 43. pp 739-745).
Sterol profile analysis is a particularly well-known method for determining the biological source of organic matter. Campesterol, β-sitosterol, and stigmasterol are common plant sterols, with β-sitosterol being a principle plant sterol. For example, β-sitosterol was found to be in greatest abundance in an analysis of certain seed oils, approximately 64% in corn, 29% in rapeseed, 64% in sunflower, 74% in cottonseed, 26% in soybean, and 79% in olive oil (Gul et al. J. Cell and Molecular Biology 5:71-79, 2006).
Oil isolated from Prototheca moriformis strain UTEX1435 were separately clarified (CL), refined and bleached (RB), or refined, bleached and deodorized (RBD) and were tested for sterol content according to the procedure described in JAOCS vol. 60, no. 8, August 1983. Results of the analysis are shown below (units in mg/100 g):





















Refined,






Refined &
bleached, &



Sterol
Crude
Clarified
bleached
deodorized





















1
Ergosterol
384  
398  
293  
302  




 (56%)
 (55%)
 (50%)
 (50%)


2
5,22-cholestadien-
14.6
18.8
14  
15.2



24-methyl-3-ol
(2.1%)
(2.6%)
(2.4%)
(2.5%)



(Brassicasterol)


3
24-methylcholest-5-
10.7
11.9
10.9
10.8



en-3-ol
(1.6%)
(1.6%)
(1.8%)
(1.8%)



(Campesterol



or 22,23-di-



hydrobrassicasterol)


4
5,22-cholestadien-
57.7
59.2
46.8
49.9



24-ethyl-3-ol
(8.4%)
(8.2%)
(7.9%)
(8.3%)



(Stigmasterol



or poriferasterol)


5
24-ethylcholest-5-
 9.64
 9.92
 9.26
10.2



en-3-ol (β-Sitosterol
(1.4%)
(1.4%)
(1.6%)
(1.7%)



or clionasterol)


6
Other sterols
209  
221  
216  
213  



Total sterols
685.64
718.82
589.96
601.1 









These results show three striking features. First, ergosterol was found to be the most abundant of all the sterols, accounting for about 50% or more of the total sterols. The amount of ergosterol is greater than that of campesterol, β-sitosterol, and stigamsterol combined. Ergosterol is steroid commonly found in fungus and not commonly found in plants, and its presence particularly in significant amounts serves as a useful marker for non-plant oils. Secondly, the oil was found to contain brassicasterol. With the exception of rapeseed oil, brassicasterol is not commonly found in plant based oils. Thirdly, less than 2% β-sitosterol (or clionasterol) was found to be present. β-sitosterol is a prominent plant sterol not commonly found in microalgae, and its presence particularly in significant amounts serves as a useful marker for oils of plant origin. As the specific stereoisomer of 24-ethylcholest-5-en-3-ol was not confirmed, this sterol was most likely clionosterol and not β-sitosterol in view of the current understanding of the sterols of the green algae (J. K. Volkman, Appl. Microbiotechnol. “Sterols in Microorganisms”, 2003, 60:495-506). In summary, Prototheca moriformis strain UTEX1435 has been found to contain both significant amounts of ergosterol and only trace amounts of 24-ethylcholest-5-en-3-ol (as β-sitosterol or clionasterol) as a percentage of total sterol content. Accordingly, the ratio of ergosterol:β-sitosterol (or clionasterol) and/or in combination with the presence of brassicasterol can be used to distinguish this oil from plant oils.
In some embodiments, the oil content of an oil provided herein contains, as a percentage of total sterols, less than 20%, 15%, 10%, 5%, 4%, 3%, 2%, or 1% β-sitosterol and/or clionasterol.
In some embodiments, the oil is free from one or more of β-sitosterol, campesterol, or stigmasterol. In some embodiments the oil is free from β-sitosterol. In some embodiments the oil is free from campesterol. In some embodiments the oil is free from stigmasterol.
In some embodiments, the oil content of an oil provided herein comprises, as a percentage of total sterols, less than 20%, 15%, 10%, 5%, 4%, 3%, 2%, or 1% 24-ethylcholest-5-en-3-ol. In some embodiments, the 24-ethylcholest-5-en-3-ol is clionasterol. In some embodiments, the oil content of an oil provided herein comprises, as a percentage of total sterols, at least 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% clionasterol.
In some embodiments, the oil content of an oil provided herein contains, as a percentage of total sterols, less than 20%, 15%, 10%, 5%, 4%, 3%, 2%, or 1% 24-methylcholest-5-en-3-ol. In some embodiments, the 24-methylcholest-5-en-3-ol is 22,23-dihydrobrassicasterol. In some embodiments, the oil content of an oil provided herein comprises, as a percentage of total sterols, at least 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% 22,23-dihydrobrassicasterol.
In some embodiments, the oil content of an oil provided herein contains, as a percentage of total sterols, less than 20%, 15%, 10%, 5%, 4%, 3%, 2%, or 1% 5,22-cholestadien-24-ethyl-3-ol. In some embodiments, the 5,22-cholestadien-24-ethyl-3-ol is poriferasterol. In some embodiments, the oil content of an oil provided herein comprises, as a percentage of total sterols, at least 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% poriferasterol.
In some embodiments, the oil content of an oil provided herein contains ergosterol or brassicasterol or a combination of the two. In some embodiments, the oil content contains, as a percentage of total sterols, at least 5%, 10%, 20%, 25%, 35%, 40%, 45%, 50%, 55%, 60%, or 65% ergosterol. In some embodiments, the oil content contains, as a percentage of total sterols, at least 25% ergosterol. In some embodiments, the oil content contains, as a percentage of total sterols, at least 40% ergosterol. In some embodiments, the oil content contains, as a percentage of total sterols, at least 5%, 10%, 20%, 25%, 35%, 40%, 45%, 50%, 55%, 60%, or 65% of a combination of ergosterol and brassicasterol.
In some embodiments, the oil content contains, as a percentage of total sterols, at least 1%, 2%, 3%, 4% or 5% brassicasterol. In some embodiments, the oil content contains, as a percentage of total sterols less than 10%, 9%, 8%, 7%, 6%, or 5% brassicasterol.
In some embodiments the ratio of ergosterol to brassicasterol is at least 5:1, 10:1, 15:1, or 20:1.
In some embodiments, the oil content contains, as a percentage of total sterols, at least 5%, 10%, 20%, 25%, 35%, 40%, 45%, 50%, 55%, 60%, or 65% ergosterol and less than 20%, 15%, 10%, 5%, 4%, 3%, 2%, or 1% β-sitosterol. In some embodiments, the oil content contains, as a percentage of total sterols, at least 25% ergosterol and less than 5% β-sitosterol. In some embodiments, the oil content further comprises brassicasterol.
In some embodiments the primary sterols in the microalgal oils provided herein are sterols other than β-sitosterol and stigmasterol. In some embodiments of the microalgal oils, C29 sterols make up less than 50%, 40%, 30%, 20%, 10%, or 5% by weight of the total sterol content.
In some embodiments the microalgal oils provided herein contain C28 sterols in excess of C29 sterols. In some embodiments of the microalgal oils, C28 sterols make up greater than 50%, 60%, 70%, 80%, 90%, or 95% by weight of the total sterol content. In some embodiments the C28 sterol is ergosterol. In some embodiments the C28 sterol is brassicasterol.
XIII. Fuels and Chemicals
The oils discussed above alone or in combination are useful in the production of foods, fuels and chemicals (including plastics, foams, films, etc). The oils, triglycerides, fatty acids from the oils may be subjected to C—H activation, hydroamino methylation, methoxy-carbonation, ozonolysis, enzymatic transformations, epoxidation, methylation, dimerization, thiolation, metathesis, hydro-alkylation, lactonization, or other chemical processes.
The oils can be converted to alkanes (e.g., renewable diesel) or esters (e.g., methyl or ethyl esters for biodisesel produced by transesterification). The alkanes or esters may be used as fuel, as solvents or lubricants, or as a chemical feedstock. Methods for production of renewable diesel and biodiesel are well established in the art. See, for example, WO2011/150411.
In a specific embodiment of the present invention, a high-oleic or high-oleic-high stability oil described above is esterified. For example, the oils can be transesterified with methanol to an oil that is rich in methyl oleate. As described in Example 49, such formulations have been found to compare favorably with methyl oleate from soybean oil.
In another specific example, the oil is converted to C36 diacids or products of C36 diacids. Fatty acids produced from the oil can be polymerized to give a composition rich in C36 dimer acids. In a specific example, high-oleic oil is split to give a high-oleic fatty acid material which is polymerized to give a composition rich in C36-dimer acids. Optionally, the oil is high oleic high stability oil (e.g., greater than 60% oleic acid with less than 3% polyunsaturates, greater than 70% oleic acid with less than 2% polyunsaturates, or greater than 80% oleic acid with less than 1% polyunsaturates). It is believed that using a high oleic, high stability, starting material will give lower amounts of cyclic products, which may be desirable in some cases. After hydrolyzing the oil, one obtains a high concentration of oleic acid. In the process of making dimer acids, a high oleic acid stream will convert to a “cleaner” C36 dimer acid and not produce trimers acids (C54) and other more complex cyclic by-products which are obtained due to presence of C18:2 and C18:3 acids. For example, the oil can be hydrolyzed to fatty acids and the fatty acids purified and dimerized at 250° C. in the presence of montmorillonite clay. See SRI Natural Fatty Acid, March 2009. A product rich in C36 dimers of oleic acid is recovered.
Further, the C36 dimer acids can be esterified and hydrogenated to give diols. The diols can be polymerized by catalytic dehydration. Polymers can also be produced by transesterification of dimerdiols with dimethyl carbonate.
For the production of fuel in accordance with the methods of the invention lipids produced by cells of the invention are harvested, or otherwise collected, by any convenient means. Lipids can be isolated by whole cell extraction. The cells are first disrupted, and then intracellular and cell membrane/cell wall-associated lipids as well as extracellular hydrocarbons can be separated from the cell mass, such as by use of centrifugation. Intracellular lipids produced in oleaginous cells are, in some embodiments, extracted after lysing the cells. Once extracted, the lipids are further refined to produce oils, fuels, or oleochemicals.
Various methods are available for separating lipids from cellular lysates. For example, lipids and lipid derivatives such as fatty aldehydes, fatty alcohols, and hydrocarbons such as alkanes can be extracted with a hydrophobic solvent such as hexane (see Frenz et al. 1989, Enzyme Microb. Technol., 11:717). Lipids and lipid derivatives can also be extracted using liquefaction (see for example Sawayama et al. 1999, Biomass and Bioenergy 17:33-39 and Inoue et al. 1993, Biomass Bioenergy 6(4):269-274); oil liquefaction (see for example Minowa et al. 1995, Fuel 74(12):1735-1738); and supercritical CO2 extraction (see for example Mendes et al. 2003, Inorganica Chimica Acta 356:328-334). Miao and Wu describe a protocol of the recovery of microalgal lipid from a culture of Chlorella protothecoides in which the cells were harvested by centrifugation, washed with distilled water and dried by freeze drying. The resulting cell powder was pulverized in a mortar and then extracted with n-hexane. Miao and Wu, Biosource Technology (2006) 97:841-846.
Lipids and lipid derivatives can be recovered by extraction with an organic solvent. In some cases, the preferred organic solvent is hexane. Typically, the organic solvent is added directly to the lysate without prior separation of the lysate components. In one embodiment, the lysate generated by one or more of the methods described above is contacted with an organic solvent for a period of time sufficient to allow the lipid and/or hydrocarbon components to form a solution with the organic solvent. In some cases, the solution can then be further refined to recover specific desired lipid or hydrocarbon components. Hexane extraction methods are well known in the art.
Lipids produced by cells in vivo, or enzymatically modified in vitro, as described herein can be optionally further processed by conventional means. The processing can include “cracking” to reduce the size, and thus increase the hydrogen:carbon ratio, of hydrocarbon molecules. Catalytic and thermal cracking methods are routinely used in hydrocarbon and triglyceride oil processing. Catalytic methods involve the use of a catalyst, such as a solid acid catalyst. The catalyst can be silica-alumina or a zeolite, which result in the heterolytic, or asymmetric, breakage of a carbon-carbon bond to result in a carbocation and a hydride anion. These reactive intermediates then undergo either rearrangement or hydride transfer with another hydrocarbon. The reactions can thus regenerate the intermediates to result in a self-propagating chain mechanism. Hydrocarbons can also be processed to reduce, optionally to zero, the number of carbon-carbon double, or triple, bonds therein. Hydrocarbons can also be processed to remove or eliminate a ring or cyclic structure therein. Hydrocarbons can also be processed to increase the hydrogen:carbon ratio. This can include the addition of hydrogen (“hydrogenation”) and/or the “cracking” of hydrocarbons into smaller hydrocarbons.
Thermal methods involve the use of elevated temperature and pressure to reduce hydrocarbon size. An elevated temperature of about 800° C. and pressure of about 700 kPa can be used. These conditions generate “light,” a term that is sometimes used to refer to hydrogen-rich hydrocarbon molecules (as distinguished from photon flux), while also generating, by condensation, heavier hydrocarbon molecules which are relatively depleted of hydrogen. The methodology provides homolytic, or symmetrical, breakage and produces alkenes, which may be optionally enzymatically saturated as described above.
Catalytic and thermal methods are standard in plants for hydrocarbon processing and oil refining. Thus hydrocarbons produced by cells as described herein can be collected and processed or refined via conventional means. See Hillen et al. (Biotechnology and Bioengineering, Vol. XXIV:193-205 (1982)) for a report on hydrocracking of microalgae-produced hydrocarbons. In alternative embodiments, the fraction is treated with another catalyst, such as an organic compound, heat, and/or an inorganic compound. For processing of lipids into biodiesel, a transesterification process is used as described below in this Section.
Hydrocarbons produced via methods of the present invention are useful in a variety of industrial applications. For example, the production of linear alkylbenzene sulfonate (LAS), an anionic surfactant used in nearly all types of detergents and cleaning preparations, utilizes hydrocarbons generally comprising a chain of 10-14 carbon atoms. See, for example, U.S. Pat. Nos. 6,946,430; 5,506,201; 6,692,730; 6,268,517; 6,020,509; 6,140,302; 5,080,848; and 5,567,359. Surfactants, such as LAS, can be used in the manufacture of personal care compositions and detergents, such as those described in U.S. Pat. Nos. 5,942,479; 6,086,903; 5,833,999; 6,468,955; and 6,407,044.
Increasing interest is directed to the use of hydrocarbon components of biological origin in fuels, such as biodiesel, renewable diesel, and jet fuel, since renewable biological starting materials that may replace starting materials derived from fossil fuels are available, and the use thereof is desirable. There is an urgent need for methods for producing hydrocarbon components from biological materials. The present invention fulfills this need by providing methods for production of biodiesel, renewable diesel, and jet fuel using the lipids generated by the methods described herein as a biological material to produce biodiesel, renewable diesel, and jet fuel.
Traditional diesel fuels are petroleum distillates rich in paraffinic hydrocarbons. They have boiling ranges as broad as 370° to 780° F., which are suitable for combustion in a compression ignition engine, such as a diesel engine vehicle. The American Society of Testing and Materials (ASTM) establishes the grade of diesel according to the boiling range, along with allowable ranges of other fuel properties, such as cetane number, cloud point, flash point, viscosity, aniline point, sulfur content, water content, ash content, copper strip corrosion, and carbon residue. Technically, any hydrocarbon distillate material derived from biomass or otherwise that meets the appropriate ASTM specification can be defined as diesel fuel (ASTM D975), jet fuel (ASTM D1655), or as biodiesel if it is a fatty acid methyl ester (ASTM D6751).
After extraction, lipid and/or hydrocarbon components recovered from the microbial biomass described herein can be subjected to chemical treatment to manufacture a fuel for use in diesel vehicles and jet engines.
Biodiesel is a liquid which varies in color—between golden and dark brown—depending on the production feedstock. It is practically immiscible with water, has a high boiling point and low vapor pressure. Biodiesel refers to a diesel-equivalent processed fuel for use in diesel-engine vehicles. Biodiesel is biodegradable and non-toxic. An additional benefit of biodiesel over conventional diesel fuel is lower engine wear. Typically, biodiesel comprises C14-C18 alkyl esters. Various processes convert biomass or a lipid produced and isolated as described herein to diesel fuels. A preferred method to produce biodiesel is by transesterification of a lipid as described herein. A preferred alkyl ester for use as biodiesel is a methyl ester or ethyl ester.
Biodiesel produced by a method described herein can be used alone or blended with conventional diesel fuel at any concentration in most modern diesel-engine vehicles. When blended with conventional diesel fuel (petroleum diesel), biodiesel may be present from about 0.1% to about 99.9%. Much of the world uses a system known as the “B” factor to state the amount of biodiesel in any fuel mix. For example, fuel containing 20% biodiesel is labeled B20. Pure biodiesel is referred to as B100.
Biodiesel can be produced by transesterification of triglycerides contained in oil-rich biomass. Thus, in another aspect of the present invention a method for producing biodiesel is provided. In a preferred embodiment, the method for producing biodiesel comprises the steps of (a) cultivating a lipid-containing microorganism using methods disclosed herein (b) lysing a lipid-containing microorganism to produce a lysate, (c) isolating lipid from the lysed microorganism, and (d) transesterifying the lipid composition, whereby biodiesel is produced. Methods for growth of a microorganism, lysing a microorganism to produce a lysate, treating the lysate in a medium comprising an organic solvent to form a heterogeneous mixture and separating the treated lysate into a lipid composition have been described above and can also be used in the method of producing biodiesel. The lipid profile of the biodiesel is usually highly similar to the lipid profile of the feedstock oil.
Lipid compositions can be subjected to transesterification to yield long-chain fatty acid esters useful as biodiesel. Preferred transesterification reactions are outlined below and include base catalyzed transesterification and transesterification using recombinant lipases. In a base-catalyzed transesterification process, the triacylglycerides are reacted with an alcohol, such as methanol or ethanol, in the presence of an alkaline catalyst, typically potassium hydroxide. This reaction forms methyl or ethyl esters and glycerin (glycerol) as a byproduct.
Transesterification has also been carried out, as discussed above, using an enzyme, such as a lipase instead of a base. Lipase-catalyzed transesterification can be carried out, for example, at a temperature between the room temperature and 80° C., and a mole ratio of the TAG to the lower alcohol of greater than 1:1, preferably about 3:1. Lipases suitable for use in transesterification include, but are not limited to, those listed in Table 9. Other examples of lipases useful for transesterification are found in, e.g., U.S. Pat. Nos. 4,798,793; 4,940,845 5,156,963; 5,342,768; 5,776,741 and WO89/01032. Such lipases include, but are not limited to, lipases produced by microorganisms of Rhizopus, Aspergillus, Candida, Mucor, Pseudomonas, Rhizomucor, Candida, and Humicola and pancreas lipase.
Subsequent processes may also be used if the biodiesel will be used in particularly cold temperatures. Such processes include winterization and fractionation. Both processes are designed to improve the cold flow and winter performance of the fuel by lowering the cloud point (the temperature at which the biodiesel starts to crystallize). There are several approaches to winterizing biodiesel. One approach is to blend the biodiesel with petroleum diesel. Another approach is to use additives that can lower the cloud point of biodiesel. Another approach is to remove saturated methyl esters indiscriminately by mixing in additives and allowing for the crystallization of saturates and then filtering out the crystals. Fractionation selectively separates methyl esters into individual components or fractions, allowing for the removal or inclusion of specific methyl esters. Fractionation methods include urea fractionation, solvent fractionation and thermal distillation.
Another valuable fuel provided by the methods of the present invention is renewable diesel, which comprises alkanes, such as C10:0, C12:0, C14:0, C16:0 and C18:0 and thus, are distinguishable from biodiesel. High quality renewable diesel conforms to the ASTM D975 standard. The lipids produced by the methods of the present invention can serve as feedstock to produce renewable diesel. Thus, in another aspect of the present invention, a method for producing renewable diesel is provided. Renewable diesel can be produced by at least three processes: hydrothermal processing (hydrotreating); hydroprocessing; and indirect liquefaction. These processes yield non-ester distillates. During these processes, triacylglycerides produced and isolated as described herein, are converted to alkanes.
In one embodiment, the method for producing renewable diesel comprises (a) cultivating a lipid-containing microorganism using methods disclosed herein (b) lysing the microorganism to produce a lysate, (c) isolating lipid from the lysed microorganism, and (d) deoxygenating and hydrotreating the lipid to produce an alkane, whereby renewable diesel is produced. Lipids suitable for manufacturing renewable diesel can be obtained via extraction from microbial biomass using an organic solvent such as hexane, or via other methods, such as those described in U.S. Pat. No. 5,928,696. Some suitable methods may include mechanical pressing and centrifuging.
In some methods, the microbial lipid is first cracked in conjunction with hydrotreating to reduce carbon chain length and saturate double bonds, respectively. The material is then isomerized, also in conjunction with hydrotreating. The naptha fraction can then be removed through distillation, followed by additional distillation to vaporize and distill components desired in the diesel fuel to meet an ASTM D975 standard while leaving components that are heavier than desired for meeting the D975 standard. Hydrotreating, hydrocracking, deoxygenation and isomerization methods of chemically modifying oils, including triglyceride oils, are well known in the art. See for example European patent applications EP1741768 (A1); EP1741767 (A1); EP1682466 (A1); EP1640437 (A1); EP1681337 (A1); EP1795576 (A1); and U.S. Pat. Nos. 7,238,277; 6,630,066; 6,596,155; 6,977,322; 7,041,866; 6,217,746; 5,885,440; 6,881,873.
In one embodiment of the method for producing renewable diesel, treating the lipid to produce an alkane is performed by hydrotreating of the lipid composition. In hydrothermal processing, typically, biomass is reacted in water at an elevated temperature and pressure to form oils and residual solids. Conversion temperatures are typically 300° to 660° F., with pressure sufficient to keep the water primarily as a liquid, 100 to 170 standard atmosphere (atm). Reaction times are on the order of 15 to 30 minutes. After the reaction is completed, the organics are separated from the water. Thereby a distillate suitable for diesel is produced.
In some methods of making renewable diesel, the first step of treating a triglyceride is hydroprocessing to saturate double bonds, followed by deoxygenation at elevated temperature in the presence of hydrogen and a catalyst. In some methods, hydrogenation and deoxygenation occur in the same reaction. In other methods deoxygenation occurs before hydrogenation. Isomerization is then optionally performed, also in the presence of hydrogen and a catalyst. Naphtha components are preferably removed through distillation. For examples, see U.S. Pat. No. 5,475,160 (hydrogenation of triglycerides); U.S. Pat. No. 5,091,116 (deoxygenation, hydrogenation and gas removal); U.S. Pat. No. 6,391,815 (hydrogenation); and U.S. Pat. No. 5,888,947 (isomerization).
One suitable method for the hydrogenation of triglycerides includes preparing an aqueous solution of copper, zinc, magnesium and lanthanum salts and another solution of alkali metal or preferably, ammonium carbonate. The two solutions may be heated to a temperature of about 20° C. to about 85° C. and metered together into a precipitation container at rates such that the pH in the precipitation container is maintained between 5.5 and 7.5 in order to form a catalyst. Additional water may be used either initially in the precipitation container or added concurrently with the salt solution and precipitation solution. The resulting precipitate may then be thoroughly washed, dried, calcined at about 300° C. and activated in hydrogen at temperatures ranging from about 100° C. to about 400° C. One or more triglycerides may then be contacted and reacted with hydrogen in the presence of the above-described catalyst in a reactor. The reactor may be a trickle bed reactor, fixed bed gas-solid reactor, packed bubble column reactor, continuously stirred tank reactor, a slurry phase reactor, or any other suitable reactor type known in the art. The process may be carried out either batchwise or in continuous fashion. Reaction temperatures are typically in the range of from about 170° C. to about 250° C. while reaction pressures are typically in the range of from about 300 psig to about 2000 psig. Moreover, the molar ratio of hydrogen to triglyceride in the process of the present invention is typically in the range of from about 20:1 to about 700:1. The process is typically carried out at a weight hourly space velocity (WHSV) in the range of from about 0.1 hr−1 to about 5 hr−4. One skilled in the art will recognize that the time period required for reaction will vary according to the temperature used, the molar ratio of hydrogen to triglyceride, and the partial pressure of hydrogen. The products produced by the such hydrogenation processes include fatty alcohols, glycerol, traces of paraffins and unreacted triglycerides. These products are typically separated by conventional means such as, for example, distillation, extraction, filtration, crystallization, and the like.
Petroleum refiners use hydroprocessing to remove impurities by treating feeds with hydrogen. Hydroprocessing conversion temperatures are typically 300° to 700° F. Pressures are typically 40 to 100 atm. The reaction times are typically on the order of 10 to 60 minutes. Solid catalysts are employed to increase certain reaction rates, improve selectivity for certain products, and optimize hydrogen consumption.
Suitable methods for the deoxygenation of an oil includes heating an oil to a temperature in the range of from about 350° F. to about 550° F. and continuously contacting the heated oil with nitrogen under at least pressure ranging from about atmospheric to above for at least about 5 minutes.
Suitable methods for isomerization include using alkali isomerization and other oil isomerization known in the art.
Hydrotreating and hydroprocessing ultimately lead to a reduction in the molecular weight of the triglyceride feed. The triglyceride molecule is reduced to four hydrocarbon molecules under hydroprocessing conditions: a propane molecule and three heavier hydrocarbon molecules, typically in the C8 to C18 range.
Thus, in one embodiment, the product of one or more chemical reaction(s) performed on lipid compositions of the invention is an alkane mixture that comprises ASTM D975 renewable diesel. Production of hydrocarbons by microorganisms is reviewed by Metzger et al. Appl Microbiol Biotechnol (2005) 66: 486-496 and A Look Back at the U.S. Department of Energy's Aquatic Species Program: Biodiesel from Algae, NREL/TP-580-24190, John Sheehan, Terri Dunahay, John Benemann and Paul Roessler (1998).
The distillation properties of a diesel fuel is described in terms of T10-T90 (temperature at 10% and 90%, respectively, volume distilled). The T10-T90 of the material produced in Example 13 was 57.9° C. Methods of hydrotreating, isomerization, and other covalent modification of oils disclosed herein, as well as methods of distillation and fractionation (such as cold filtration) disclosed herein, can be employed to generate renewable diesel compositions with other T10-T90 ranges, such as 20, 25, 30, 35, 40, 45, 50, 60 and 65° C. using triglyceride oils produced according to the methods disclosed herein.
Methods of hydrotreating, isomerization, and other covalent modification of oils disclosed herein, as well as methods of distillation and fractionation (such as cold filtration) disclosed herein, can be employed to generate renewable diesel compositions with other T10 values, such as T10 between 180 and 295, between 190 and 270, between 210 and 250, between 225 and 245, and at least 290.
Methods of hydrotreating, isomerization, and other covalent modification of oils disclosed herein, as well as methods of distillation and fractionation (such as cold filtration) disclosed herein can be employed to generate renewable diesel compositions with certain T90 values, such as T90 between 280 and 380, between 290 and 360, between 300 and 350, between 310 and 340, and at least 290.
The FBP of the material produced in Example 13 was 300° C. Methods of hydrotreating, isomerization, and other covalent modification of oils disclosed herein, as well as methods of distillation and fractionation (such as cold filtration) disclosed herein, can be employed to generate renewable diesel compositions with other FBP values, such as FBP between 290 and 400, between 300 and 385, between 310 and 370, between 315 and 360, and at least 300.
Other oils provided by the methods and compositions of the invention can be subjected to combinations of hydrotreating, isomerization, and other covalent modification including oils with lipid profiles including (a) at least 1%-5%, preferably at least 4%, C8-C14; (b) at least 0.25%-1%, preferably at least 0.3%, C8; (c) at least 1%-5%, preferably at least 2%, C10; (d) at least 1%-5%, preferably at least 2%, C12; and (3) at least 20%-40%, preferably at least 30% C8-C14.
A traditional ultra-low sulfur diesel can be produced from any form of biomass by a two-step process. First, the biomass is converted to a syngas, a gaseous mixture rich in hydrogen and carbon monoxide. Then, the syngas is catalytically converted to liquids. Typically, the production of liquids is accomplished using Fischer-Tropsch (FT) synthesis. This technology applies to coal, natural gas, and heavy oils. Thus, in yet another preferred embodiment of the method for producing renewable diesel, treating the lipid composition to produce an alkane is performed by indirect liquefaction of the lipid composition.
The present invention also provides methods to produce jet fuel. Jet fuel is clear to straw colored. The most common fuel is an unleaded/paraffin oil-based fuel classified as Aeroplane A-1, which is produced to an internationally standardized set of specifications. Jet fuel is a mixture of a large number of different hydrocarbons, possibly as many as a thousand or more. The range of their sizes (molecular weights or carbon numbers) is restricted by the requirements for the product, for example, freezing point or smoke point. Kerosone-type Aeroplane fuel (including Jet A and Jet A-1) has a carbon number distribution between about 8 and 16 carbon numbers. Wide-cut or naphtha-type Aeroplane fuel (including Jet B) typically has a carbon number distribution between about 5 and 15 carbons.
In one embodiment of the invention, a jet fuel is produced by blending algal fuels with existing jet fuel. The lipids produced by the methods of the present invention can serve as feedstock to produce jet fuel. Thus, in another aspect of the present invention, a method for producing jet fuel is provided. Herewith two methods for producing jet fuel from the lipids produced by the methods of the present invention are provided: fluid catalytic cracking (FCC); and hydrodeoxygenation (HDO).
Fluid Catalytic Cracking (FCC) is one method which is used to produce olefins, especially propylene from heavy crude fractions. The lipids produced by the method of the present invention can be converted to olefins. The process involves flowing the lipids produced through an FCC zone and collecting a product stream comprised of olefins, which is useful as a jet fuel. The lipids produced are contacted with a cracking catalyst at cracking conditions to provide a product stream comprising olefins and hydrocarbons useful as jet fuel.
In one embodiment, the method for producing jet fuel comprises (a) cultivating a lipid-containing microorganism using methods disclosed herein, (b) lysing the lipid-containing microorganism to produce a lysate, (c) isolating lipid from the lysate, and (d) treating the lipid composition, whereby jet fuel is produced. In one embodiment of the method for producing a jet fuel, the lipid composition can be flowed through a fluid catalytic cracking zone, which, in one embodiment, may comprise contacting the lipid composition with a cracking catalyst at cracking conditions to provide a product stream comprising C2-C5 olefins.
In certain embodiments of this method, it may be desirable to remove any contaminants that may be present in the lipid composition. Thus, prior to flowing the lipid composition through a fluid catalytic cracking zone, the lipid composition is pretreated. Pretreatment may involve contacting the lipid composition with an ion-exchange resin. The ion exchange resin is an acidic ion exchange resin, such as AmberlystTM-15 and can be used as a bed in a reactor through which the lipid composition is flowed, either upflow or downflow. Other pretreatments may include mild acid washes by contacting the lipid composition with an acid, such as sulfuric, acetic, nitric, or hydrochloric acid. Contacting is done with a dilute acid solution usually at ambient temperature and atmospheric pressure.
The lipid composition, optionally pretreated, is flowed to an FCC zone where the hydrocarbonaceous components are cracked to olefins. Catalytic cracking is accomplished by contacting the lipid composition in a reaction zone with a catalyst composed of finely divided particulate material. The reaction is catalytic cracking, as opposed to hydrocracking, and is carried out in the absence of added hydrogen or the consumption of hydrogen. As the cracking reaction proceeds, substantial amounts of coke are deposited on the catalyst. The catalyst is regenerated at high temperatures by burning coke from the catalyst in a regeneration zone. Coke-containing catalyst, referred to herein as “coked catalyst”, is continually transported from the reaction zone to the regeneration zone to be regenerated and replaced by essentially coke-free regenerated catalyst from the regeneration zone. Fluidization of the catalyst particles by various gaseous streams allows the transport of catalyst between the reaction zone and regeneration zone. Methods for cracking hydrocarbons, such as those of the lipid composition described herein, in a fluidized stream of catalyst, transporting catalyst between reaction and regeneration zones, and combusting coke in the regenerator are well known by those skilled in the art of FCC processes. Exemplary FCC applications and catalysts useful for cracking the lipid composition to produce C2-C5 olefins are described in U.S. Pat. Nos. 6,538,169, 7,288,685, which are incorporated in their entirety by reference.
Suitable FCC catalysts generally comprise at least two components that may or may not be on the same matrix. In some embodiments, both two components may be circulated throughout the entire reaction vessel. The first component generally includes any of the well-known catalysts that are used in the art of fluidized catalytic cracking, such as an active amorphous clay-type catalyst and/or a high activity, crystalline molecular sieve. Molecular sieve catalysts may be preferred over amorphous catalysts because of their much-improved selectivity to desired products. In some preferred embodiments, zeolites may be used as the molecular sieve in the FCC processes. Preferably, the first catalyst component comprises a large pore zeolite, such as a Y-type zeolite, an active alumina material, a binder material, comprising either silica or alumina and an inert filler such as kaolin.
In one embodiment, cracking the lipid composition of the present invention, takes place in the riser section or, alternatively, the lift section, of the FCC zone. The lipid composition is introduced into the riser by a nozzle resulting in the rapid vaporization of the lipid composition. Before contacting the catalyst, the lipid composition will ordinarily have a temperature of about 149° C. to about 316° C. (300° F. to 600° F.). The catalyst is flowed from a blending vessel to the riser where it contacts the lipid composition for a time of abort 2 seconds or less.
The blended catalyst and reacted lipid composition vapors are then discharged from the top of the riser through an outlet and separated into a cracked product vapor stream including olefins and a collection of catalyst particles covered with substantial quantities of coke and generally referred to as “coked catalyst.” In an effort to minimize the contact time of the lipid composition and the catalyst which may promote further conversion of desired products to undesirable other products, any arrangement of separators such as a swirl arm arrangement can be used to remove coked catalyst from the product stream quickly. The separator, e.g. swirl arm separator, is located in an upper portion of a chamber with a stripping zone situated in the lower portion of the chamber. Catalyst separated by the swirl arm arrangement drops down into the stripping zone. The cracked product vapor stream comprising cracked hydrocarbons including light olefins and some catalyst exit the chamber via a conduit which is in communication with cyclones. The cyclones remove remaining catalyst particles from the product vapor stream to reduce particle concentrations to very low levels. The product vapor stream then exits the top of the separating vessel. Catalyst separated by the cyclones is returned to the separating vessel and then to the stripping zone. The stripping zone removes adsorbed hydrocarbons from the surface of the catalyst by counter-current contact with steam.
Low hydrocarbon partial pressure operates to favor the production of light olefins. Accordingly, the riser pressure is set at about 172 to 241 kPa (25 to 35 psia) with a hydrocarbon partial pressure of about 35 to 172 kPa (5 to 25 psia), with a preferred hydrocarbon partial pressure of about 69 to 138 kPa (10 to 20 psia). This relatively low partial pressure for hydrocarbon is achieved by using steam as a diluent to the extent that the diluent is 10 to 55 wt-% of lipid composition and preferably about 15 wt-% of lipid composition. Other diluents such as dry gas can be used to reach equivalent hydrocarbon partial pressures.
The temperature of the cracked stream at the riser outlet will be about 510° C. to 621° C. (950° F. to 1150° F.). However, riser outlet temperatures above 566° C. (1050° F.) make more dry gas and more olefins. Whereas, riser outlet temperatures below 566° C. (1050° F.) make less ethylene and propylene. Accordingly, it is preferred to run the FCC process at a preferred temperature of about 566° C. to about 630° C., preferred pressure of about 138 kPa to about 240 kPa (20 to 35 psia). Another condition for the process is the catalyst to lipid composition ratio which can vary from about 5 to about 20 and preferably from about 10 to about 15.
In one embodiment of the method for producing a jet fuel, the lipid composition is introduced into the lift section of an FCC reactor. The temperature in the lift section will be very hot and range from about 700° C. (1292° F.) to about 760° C. (1400° F.) with a catalyst to lipid composition ratio of about 100 to about 150. It is anticipated that introducing the lipid composition into the lift section will produce considerable amounts of propylene and ethylene.
In another embodiment of the method for producing a jet fuel using the lipid composition or the lipids produced as described herein, the structure of the lipid composition or the lipids is broken by a process referred to as hydrodeoxygenation (HDO). HDO means removal of oxygen by means of hydrogen, that is, oxygen is removed while breaking the structure of the material. Olefinic double bonds are hydrogenated and any sulfur and nitrogen compounds are removed. Sulfur removal is called hydrodesulphurization (HDS). Pretreatment and purity of the raw materials (lipid composition or the lipids) contribute to the service life of the catalyst.
Generally in the HDO/HDS step, hydrogen is mixed with the feed stock (lipid composition or the lipids) and then the mixture is passed through a catalyst bed as a co-current flow, either as a single phase or a two phase feed stock. After the HDO/MDS step, the product fraction is separated and passed to a separate isomerization reactor. An isomerization reactor for biological starting material is described in the literature (FI 100 248) as a co-current reactor.
The process for producing a fuel by hydrogenating a hydrocarbon feed, e.g., the lipid composition or the lipids herein, can also be performed by passing the lipid composition or the lipids as a co-current flow with hydrogen gas through a first hydrogenation zone, and thereafter the hydrocarbon effluent is further hydrogenated in a second hydrogenation zone by passing hydrogen gas to the second hydrogenation zone as a counter-current flow relative to the hydrocarbon effluent. Exemplary HDO applications and catalysts useful for cracking the lipid composition to produce C2-C5 olefins are described in U.S. Pat. No. 7,232,935, which is incorporated in its entirety by reference.
Typically, in the hydrodeoxygenation step, the structure of the biological component, such as the lipid composition or lipids herein, is decomposed, oxygen, nitrogen, phosphorus and sulfur compounds, and light hydrocarbons as gas are removed, and the olefinic bonds are hydrogenated. In the second step of the process, i.e. in the so-called isomerization step, isomerization is carried out for branching the hydrocarbon chain and improving the performance of the paraffin at low temperatures.
In the first step, i.e. HDO step, of the cracking process, hydrogen gas and the lipid composition or lipids herein which are to be hydrogenated are passed to a HDO catalyst bed system either as co-current or counter-current flows, said catalyst bed system comprising one or more catalyst bed(s), preferably 1-3 catalyst beds. The HDO step is typically operated in a co-current manner. In case of a HDO catalyst bed system comprising two or more catalyst beds, one or more of the beds may be operated using the counter-current flow principle. In the HDO step, the pressure varies between 20 and 150 bar, preferably between 50 and 100 bar, and the temperature varies between 200 and 500° C., preferably in the range of 300-400° C. In the HDO step, known hydrogenation catalysts containing metals from Group VII and/or VIB of the Periodic System may be used. Preferably, the hydrogenation catalysts are supported Pd, Pt, Ni, NiMo or a CoMo catalysts, the support being alumina and/or silica. Typically, NiMo/Al2O3 and CoMo/Al2O3 catalysts are used.
Prior to the HDO step, the lipid composition or lipids herein may optionally be treated by prehydrogenation under milder conditions thus avoiding side reactions of the double bonds. Such prehydrogenation is carried out in the presence of a prehydrogenation catalyst at temperatures of 50-400° C. and at hydrogen pressures of 1-200 bar, preferably at a temperature between 150 and 250° C. and at a hydrogen pressure between 10 and 100 bar. The catalyst may contain metals from Group VIII and/or VIB of the Periodic System. Preferably, the prehydrogenation catalyst is a supported Pd, Pt, Ni, NiMo or a CoMo catalyst, the support being alumina and/or silica.
A gaseous stream from the HDO step containing hydrogen is cooled and then carbon monoxide, carbon dioxide, nitrogen, phosphorus and sulfur compounds, gaseous light hydrocarbons and other impurities are removed therefrom. After compressing, the purified hydrogen or recycled hydrogen is returned back to the first catalyst bed and/or between the catalyst beds to make up for the withdrawn gas stream. Water is removed from the condensed liquid. The liquid is passed to the first catalyst bed or between the catalyst beds.
After the HDO step, the product is subjected to an isomerization step. It is substantial for the process that the impurities are removed as completely as possible before the hydrocarbons are contacted with the isomerization catalyst. The isomerization step comprises an optional stripping step, wherein the reaction product from the HDO step may be purified by stripping with water vapor or a suitable gas such as light hydrocarbon, nitrogen or hydrogen. The optional stripping step is carried out in counter-current manner in a unit upstream of the isomerization catalyst, wherein the gas and liquid are contacted with each other, or before the actual isomerization reactor in a separate stripping unit utilizing counter-current principle.
After the stripping step the hydrogen gas and the hydrogenated lipid composition or lipids herein, and optionally an n-paraffin mixture, are passed to a reactive isomerization unit comprising one or several catalyst bed(s). The catalyst beds of the isomerization step may operate either in co-current or counter-current manner.
It is important for the process that the counter-current flow principle is applied in the isomerization step. In the isomerization step this is done by carrying out either the optional stripping step or the isomerization reaction step or both in counter-current manner. In the isomerization step, the pressure varies in the range of 20-150 bar, preferably in the range of 20-100 bar, the temperature being between 200 and 500° C., preferably between 300 and 400° C. In the isomerization step, isomerization catalysts known in the art may be used. Suitable isomerization catalysts contain molecular sieve and/or a metal from Group VII and/or a carrier. Preferably, the isomerization catalyst contains SAPO-11 or SAPO41 or ZSM-22 or ZSM-23 or ferrierite and Pt, Pd or Ni and Al2O3 or SiO2. Typical isomerization catalysts are, for example, Pt/SAPO-11/Al2O3, Pt/ZSM-22/Al2O3, Pt/ZSM-23/Al2O3 and Pt/SAPO-11/SiO2. The isomerization step and the HDO step may be carried out in the same pressure vessel or in separate pressure vessels. Optional prehydrogenation may be carried out in a separate pressure vessel or in the same pressure vessel as the HDO and isomerization steps.
Thus, in one embodiment, the product of one or more chemical reactions is an alkane mixture that comprises HRJ-5. In another embodiment, the product of the one or more chemical reactions is an alkane mixture that comprises ASTM D1655 jet fuel. In some embodiments, the composition comforming to the specification of ASTM 1655 jet fuel has a sulfur content that is less than 10 ppm. In other embodiments, the composition conforming to the specification of ASTM 1655 jet fuel has a T10 value of the distillation curve of less than 205° C. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a final boiling point (FBP) of less than 300° C. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a flash point of at least 38° C. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a density between 775K/M3 and 840K/M3. In yet another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a freezing point that is below −47° C. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a net Heat of Combustion that is at least 42.8 MJ/K. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a hydrogen content that is at least 13.4 mass %. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has a thermal stability, as tested by quantitative gravimetric JFTOT at 260° C., which is below 3 mm of Hg. In another embodiment, the composition conforming to the specification of ASTM 1655 jet fuel has an existent gum that is below 7 mg/dl.
Thus, the present invention discloses a variety of methods in which chemical modification of microalgal lipid is undertaken to yield products useful in a variety of industrial and other applications. Examples of processes for modifying oil produced by the methods disclosed herein include, but are not limited to, hydrolysis of the oil, hydroprocessing of the oil, and esterification of the oil. Other chemical modification of microalgal lipid include, without limitation, epoxidation, oxidation, hydrolysis, sulfations, sulfonation, ethoxylation, propoxylation, amidation, and saponification. The modification of the microalgal oil produces basic oleochemicals that can be further modified into selected derivative oleochemicals for a desired function. In a manner similar to that described above with reference to fuel producing processes, these chemical modifications can also be performed on oils generated from the microbial cultures described herein. Examples of basic oleochemicals include, but are not limited to, soaps, fatty acids, fatty esters, fatty alcohols, fatty nitrogen compounds including fatty amides, fatty acid methyl esters, and glycerol. Examples of derivative oleochemicals include, but are not limited to, fatty nitriles, esters, dimer acids, quats, surfactants, fatty alkanolamides, fatty alcohol sulfates, resins, emulsifiers, fatty alcohols, olefins, drilling muds, polyols, polyurethanes, polyacrylates, rubber, candles, cosmetics, metallic soaps, soaps, alpha-sulphonated methyl esters, fatty alcohol sulfates, fatty alcohol ethoxylates, fatty alcohol ether sulfates, imidazolines, surfactants, detergents, esters, quats, ozonolysis products, fatty amines, fatty alkanolamides, ethoxysulfates, monoglycerides, diglycerides, triglycerides (including medium chain triglycerides), lubricants, hydraulic fluids, greases, dielectric fluids, mold release agents, metal working fluids, heat transfer fluids, other functional fluids, industrial chemicals (e.g., cleaners, textile processing aids, plasticizers, stabilizers, additives), surface coatings, paints and lacquers, electrical wiring insulation, and higher alkanes. Rubber compositions comprising microbial oils (e.g., microalgal oil) can be used in, e.g., the manfacture of tire treads and/or tires. Elastomers and additives for use in preparation of the rubber compositions disclosed herein are described in U.S. Pat. Nos. 7,253,225, 7,335,692, 8,324,310, and US 2013/0096248, which are hereby incorporated by reference in their entirety.
Hydrolysis of the fatty acid constituents from the glycerolipids produced by the methods of the invention yields free fatty acids that can be derivatized to produce other useful chemicals. Hydrolysis occurs in the presence of water and a catalyst which may be either an acid or a base. The liberated free fatty acids can be derivatized to yield a variety of products, as reported in the following: U.S. Pat. No. 5,304,664 (Highly sulfated fatty acids); U.S. Pat. No. 7,262,158 (Cleansing compositions); U.S. Pat. No. 7,115,173 (Fabric softener compositions); U.S. Pat. No. 6,342,208 (Emulsions for treating skin); U.S. Pat. No. 7,264,886 (Water repellant compositions); U.S. Pat. No. 6,924,333 (Paint additives); U.S. Pat. No. 6,596,768 (Lipid-enriched ruminant feedstock); and U.S. Pat. No. 6,380,410 (Surfactants for detergents and cleaners).
In some methods, the first step of chemical modification may be hydroprocessing to saturate double bonds, followed by deoxygenation at elevated temperature in the presence of hydrogen and a catalyst. In other methods, hydrogenation and deoxygenation may occur in the same reaction. In still other methods deoxygenation occurs before hydrogenation. Isomerization may then be optionally performed, also in the presence of hydrogen and a catalyst. Finally, gases and naphtha components can be removed if desired. For example, see U.S. Pat. No. 5,475,160 (hydrogenation of triglycerides); U.S. Pat. No. 5,091,116 (deoxygenation, hydrogenation and gas removal); U.S. Pat. No. 6,391,815 (hydrogenation); and U.S. Pat. No. 5,888,947 (isomerization).
In some embodiments of the invention, the triglyceride oils are partially or completely deoxygenated. The deoxygenation reactions form desired products, including, but not limited to, fatty acids, fatty alcohols, polyols, ketones, and aldehydes. In general, without being limited by any particular theory, the deoxygenation reactions involve a combination of various different reaction pathways, including without limitation: hydrogenolysis, hydrogenation, consecutive hydrogenation-hydrogenolysis, consecutive hydrogenolysis-hydrogenation, and combined hydrogenation-hydrogenolysis reactions, resulting in at least the partial removal of oxygen from the fatty acid or fatty acid ester to produce reaction products, such as fatty alcohols, that can be easily converted to the desired chemicals by further processing. For example, in one embodiment, a fatty alcohol may be converted to olefins through FCC reaction or to higher alkanes through a condensation reaction.
One such chemical modification is hydrogenation, which is the addition of hydrogen to double bonds in the fatty acid constituents of glycerolipids or of free fatty acids. The hydrogenation process permits the transformation of liquid oils into semi-solid or solid fats, which may be more suitable for specific applications.
Hydrogenation of oil produced by the methods described herein can be performed in conjunction with one or more of the methods and/or materials provided herein, as reported in the following: U.S. Pat. No. 7,288,278 (Food additives or medicaments); U.S. Pat. No. 5,346,724 (Lubrication products); U.S. Pat. No. 5,475,160 (Fatty alcohols); U.S. Pat. No. 5,091,116 (Edible oils); U.S. Pat. No. 6,808,737 (Structural fats for margarine and spreads); U.S. Pat. No. 5,298,637 (Reduced-calorie fat substitutes); U.S. Pat. No. 6,391,815 (Hydrogenation catalyst and sulfur adsorbent); U.S. Pat. No. 5,233,099 and U.S. Pat. No. 5,233,100 (Fatty alcohols); U.S. Pat. No. 4,584,139 (Hydrogenation catalysts); U.S. Pat. No. 6,057,375 (Foam suppressing agents); and U.S. Pat. No. 7,118,773 (Edible emulsion spreads).
One skilled in the art will recognize that various processes may be used to hydrogenate carbohydrates. One suitable method includes contacting the carbohydrate with hydrogen or hydrogen mixed with a suitable gas and a catalyst under conditions sufficient in a hydrogenation reactor to form a hydrogenated product. The hydrogenation catalyst generally can include Cu, Re, Ni, Fe, Co, Ru, Pd, Rh, Pt, Os, Ir, and alloys or any combination thereof, either alone or with promoters such as W, Mo, Au, Ag, Cr, Zn, Mn, Sn, B, P, Bi, and alloys or any combination thereof. Other effective hydrogenation catalyst materials include either supported nickel or ruthenium modified with rhenium. In an embodiment, the hydrogenation catalyst also includes any one of the supports, depending on the desired functionality of the catalyst. The hydrogenation catalysts may be prepared by methods known to those of ordinary skill in the art.
In some embodiments the hydrogenation catalyst includes a supported Group VIII metal catalyst and a metal sponge material (e.g., a sponge nickel catalyst). Raney nickel provides an example of an activated sponge nickel catalyst suitable for use in this invention. In other embodiment, the hydrogenation reaction in the invention is performed using a catalyst comprising a nickel-rhenium catalyst or a tungsten-modified nickel catalyst. One example of a suitable catalyst for the hydrogenation reaction of the invention is a carbon-supported nickel-rhenium catalyst.
In an embodiment, a suitable Raney nickel catalyst may be prepared by treating an alloy of approximately equal amounts by weight of nickel and aluminum with an aqueous alkali solution, e.g., containing about 25 weight % of sodium hydroxide. The aluminum is selectively dissolved by the aqueous alkali solution resulting in a sponge shaped material comprising mostly nickel with minor amounts of aluminum. The initial alloy includes promoter metals (i.e., molybdenum or chromium) in the amount such that about 1 to 2 weight % remains in the formed sponge nickel catalyst. In another embodiment, the hydrogenation catalyst is prepared using a solution of ruthenium (III) nitrosylnitrate, ruthenium (III) chloride in water to impregnate a suitable support material. The solution is then dried to form a solid having a water content of less than about 1% by weight. The solid may then be reduced at atmospheric pressure in a hydrogen stream at 300° C. (uncalcined) or 400° C. (calcined) in a rotary ball furnace for 4 hours. After cooling and rendering the catalyst inert with nitrogen, 5% by volume of oxygen in nitrogen is passed over the catalyst for 2 hours.
In certain embodiments, the catalyst described includes a catalyst support. The catalyst support stabilizes and supports the catalyst. The type of catalyst support used depends on the chosen catalyst and the reaction conditions. Suitable supports for the invention include, but are not limited to, carbon, silica, silica-alumina, zirconia, titania, ceria, vanadia, nitride, boron nitride, heteropolyacids, hydroxyapatite, zinc oxide, chromia, zeolites, carbon nanotubes, carbon fullerene and any combination thereof.
The catalysts used in this invention can be prepared using conventional methods known to those in the art. Suitable methods may include, but are not limited to, incipient wetting, evaporative impregnation, chemical vapor deposition, wash-coating, magnetron sputtering techniques, and the like.
The conditions for which to carry out the hydrogenation reaction will vary based on the type of starting material and the desired products. One of ordinary skill in the art, with the benefit of this disclosure, will recognize the appropriate reaction conditions. In general, the hydrogenation reaction is conducted at temperatures of 80° C. to 250° C., and preferably at 90° C. to 200° C., and most preferably at 100° C. to 150° C. In some embodiments, the hydrogenation reaction is conducted at pressures from 500 KPa to 14000 KPa.
The hydrogen used in the hydrogenolysis reaction of the current invention may include external hydrogen, recycled hydrogen, in situ generated hydrogen, and any combination thereof. As used herein, the term “external hydrogen” refers to hydrogen that does not originate from the biomass reaction itself, but rather is added to the system from another source.
In some embodiments of the invention, it is desirable to convert the starting carbohydrate to a smaller molecule that will be more readily converted to desired higher hydrocarbons. One suitable method for this conversion is through a hydrogenolysis reaction. Various processes are known for performing hydrogenolysis of carbohydrates. One suitable method includes contacting a carbohydrate with hydrogen or hydrogen mixed with a suitable gas and a hydrogenolysis catalyst in a hydrogenolysis reactor under conditions sufficient to form a reaction product comprising smaller molecules or polyols. As used herein, the term “smaller molecules or polyols” includes any molecule that has a smaller molecular weight, which can include a smaller number of carbon atoms or oxygen atoms than the starting carbohydrate. In an embodiment, the reaction products include smaller molecules that include polyols and alcohols. Someone of ordinary skill in the art would be able to choose the appropriate method by which to carry out the hydrogenolysis reaction.
In some embodiments, a 5 and/or 6 carbon sugar or sugar alcohol may be converted to propylene glycol, ethylene glycol, and glycerol using a hydrogenolysis catalyst. The hydrogenolysis catalyst may include Cr, Mo, W, Re, Mn, Cu, Cd, Fe, Co, Ni, Pt, Pd, Rh, Ru, Ir, Os, and alloys or any combination thereof, either alone or with promoters such as Au, Ag, Cr, Zn, Mn, Sn, Bi, B, O, and alloys or any combination thereof. The hydrogenolysis catalyst may also include a carbonaceous pyropolymer catalyst containing transition metals (e.g., chromium, molybdemum, tungsten, rhenium, manganese, copper, cadmium) or Group VIII metals (e.g., iron, cobalt, nickel, platinum, palladium, rhodium, ruthenium, iridium, and osmium). In certain embodiments, the hydrogenolysis catalyst may include any of the above metals combined with an alkaline earth metal oxide or adhered to a catalytically active support. In certain embodiments, the catalyst described in the hydrogenolysis reaction may include a catalyst support as described above for the hydrogenation reaction.
The conditions for which to carry out the hydrogenolysis reaction will vary based on the type of starting material and the desired products. One of ordinary skill in the art, with the benefit of this disclosure, will recognize the appropriate conditions to use to carry out the reaction. In general, they hydrogenolysis reaction is conducted at temperatures of 110° C. to 300° C., and preferably at 170° C. to 220° C., and most preferably at 200° C. to 225° C. In some embodiments, the hydrogenolysis reaction is conducted under basic conditions, preferably at a pH of 8 to 13, and even more preferably at a pH of 10 to 12. In some embodiments, the hydrogenolysis reaction is conducted at pressures in a range between 60 KPa and 16500 KPa, and preferably in a range between 1700 KPa and 14000 KPa, and even more preferably between 4800 KPa and 11000 KPa.
The hydrogen used in the hydrogenolysis reaction of the current invention can include external hydrogen, recycled hydrogen, in situ generated hydrogen, and any combination thereof.
In some embodiments, the reaction products discussed above may be converted into higher hydrocarbons through a condensation reaction in a condensation reactor. In such embodiments, condensation of the reaction products occurs in the presence of a catalyst capable of forming higher hydrocarbons. While not intending to be limited by theory, it is believed that the production of higher hydrocarbons proceeds through a stepwise addition reaction including the formation of carbon-carbon, or carbon-oxygen bond. The resulting reaction products include any number of compounds containing these moieties, as described in more detail below.
In certain embodiments, suitable condensation catalysts include an acid catalyst, a base catalyst, or an acid/base catalyst. As used herein, the term “acid/base catalyst” refers to a catalyst that has both an acid and a base functionality. In some embodiments the condensation catalyst can include, without limitation, zeolites, carbides, nitrides, zirconia, alumina, silica, aluminosilicates, phosphates, titanium oxides, zinc oxides, vanadium oxides, lanthanum oxides, yttrium oxides, scandium oxides, magnesium oxides, cerium oxides, barium oxides, calcium oxides, hydroxides, heteropolyacids, inorganic acids, acid modified resins, base modified resins, and any combination thereof. In some embodiments, the condensation catalyst can also include a modifier. Suitable modifiers include La, Y, Sc, P, B, Bi, Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, and any combination thereof. In some embodiments, the condensation catalyst can also include a metal. Suitable metals include Cu, Ag, Au, Pt, Ni, Fe, Co, Ru, Zn, Cd, Ga, In, Rh, Pd, Ir, Re, Mn, Cr, Mo, W, Sn, Os, alloys, and any combination thereof.
In certain embodiments, the catalyst described in the condensation reaction may include a catalyst support as described above for the hydrogenation reaction. In certain embodiments, the condensation catalyst is self-supporting. As used herein, the term “self-supporting” means that the catalyst does not need another material to serve as support. In other embodiments, the condensation catalyst in used in conjunction with a separate support suitable for suspending the catalyst. In an embodiment, the condensation catalyst support is silica.
The conditions under which the condensation reaction occurs will vary based on the type of starting material and the desired products. One of ordinary skill in the art, with the benefit of this disclosure, will recognize the appropriate conditions to use to carry out the reaction. In some embodiments, the condensation reaction is carried out at a temperature at which thermodynamics for the proposed reaction are favorable. The temperature for the condensation reaction will vary depending on the specific starting polyol or alcohol. In some embodiments, the temperature for the condensation reaction is in a range from 80° C. to 500° C., and preferably from 125° C. to 450° C., and most preferably from 125° C. to 250° C. In some embodiments, the condensation reaction is conducted at pressures in a range between 0 Kpa to 9000 KPa, and preferably in a range between 0 KPa and 7000 KPa, and even more preferably between 0 KPa and 5000 KPa.
The higher alkanes formed by the invention include, but are not limited to, branched or straight chain alkanes that have from 4 to 30 carbon atoms, branched or straight chain alkenes that have from 4 to 30 carbon atoms, cycloalkanes that have from 5 to 30 carbon atoms, cycloalkenes that have from 5 to 30 carbon atoms, aryls, fused aryls, alcohols, and ketones. Suitable alkanes include, but are not limited to, butane, pentane, pentene, 2-methylbutane, hexane, hexene, 2-methylpentane, 3-methylpentane, 2,2,-dimethylbutane, 2,3-dimethylbutane, heptane, heptene, octane, octene, 2,2,4-trimethylpentane, 2,3-dimethyl hexane, 2,3,4-trimethylpentane, 2,3-dimethylpentane, nonane, nonene, decane, decene, undecane, undecene, dodecane, dodecene, tridecane, tridecene, tetradecane, tetradecene, pentadecane, pentadecene, nonyldecane, nonyldecene, eicosane, eicosene, uneicosane, uneicosene, doeicosane, doeicosene, trieicosane, trieicosene, tetraeicosane, tetraeicosene, and isomers thereof. Some of these products may be suitable for use as fuels.
In some embodiments, the cycloalkanes and the cycloalkenes are unsubstituted. In other embodiments, the cycloalkanes and cycloalkenes are mono-substituted. In still other embodiments, the cycloalkanes and cycloalkenes are multi-substituted. In the embodiments comprising the substituted cycloalkanes and cycloalkenes, the substituted group includes, without limitation, a branched or straight chain alkyl having 1 to 12 carbon atoms, a branched or straight chain alkylene having 1 to 12 carbon atoms, a phenyl, and any combination thereof. Suitable cycloalkanes and cycloalkenes include, but are not limited to, cyclopentane, cyclopentene, cyclohexane, cyclohexene, methyl-cyclopentane, methyl-cyclopentene, ethyl-cyclopentane, ethyl-cyclopentene, ethyl-cyclohexane, ethyl-cyclohexene, isomers and any combination thereof.
In some embodiments, the aryls formed are unsubstituted. In another embodiment, the aryls formed are mono-substituted. In the embodiments comprising the substituted aryls, the substituted group includes, without limitation, a branched or straight chain alkyl having 1 to 12 carbon atoms, a branched or straight chain alkylene having 1 to 12 carbon atoms, a phenyl, and any combination thereof. Suitable aryls for the invention include, but are not limited to, benzene, toluene, xylene, ethyl benzene, para xylene, meta xylene, and any combination thereof.
The alcohols produced in the invention have from 4 to 30 carbon atoms. In some embodiments, the alcohols are cyclic. In other embodiments, the alcohols are branched. In another embodiment, the alcohols are straight chained. Suitable alcohols for the invention include, but are not limited to, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptyldecanol, octyldecanol, nonyldecanol, eicosanol, uneicosanol, doeicosanol, trieicosanol, tetraeicosanol, and isomers thereof.
The ketones produced in the invention have from 4 to 30 carbon atoms. In an embodiment, the ketones are cyclic. In another embodiment, the ketones are branched. In another embodiment, the ketones are straight chained. Suitable ketones for the invention include, but are not limited to, butanone, pentanone, hexanone, heptanone, octanone, nonanone, decanone, undecanone, dodecanone, tridecanone, tetradecanone, pentadecanone, hexadecanone, heptyldecanone, octyldecanone, nonyldecanone, eicosanone, uneicosanone, doeicosanone, trieicosanone, tetraeicosanone, and isomers thereof.
Another such chemical modification is interesterification. Naturally produced glycerolipids do not have a uniform distribution of fatty acid constituents. In the context of oils, interesterification refers to the exchange of acyl radicals between two esters of different glycerolipids. The interesterification process provides a mechanism by which the fatty acid constituents of a mixture of glycerolipids can be rearranged to modify the distribution pattern. Interesterification is a well-known chemical process, and generally comprises heating (to about 200° C.) a mixture of oils for a period (e.g, 30 minutes) in the presence of a catalyst, such as an alkali metal or alkali metal alkylate (e.g., sodium methoxide). This process can be used to randomize the distribution pattern of the fatty acid constituents of an oil mixture, or can be directed to produce a desired distribution pattern. This method of chemical modification of lipids can be performed on materials provided herein, such as microbial biomass with a percentage of dry cell weight as lipid at least 20%.
Directed interesterification, in which a specific distribution pattern of fatty acids is sought, can be performed by maintaining the oil mixture at a temperature below the melting point of some TAGs which might occur. This results in selective crystallization of these TAGs, which effectively removes them from the reaction mixture as they crystallize. The process can be continued until most of the fatty acids in the oil have precipitated, for example. A directed interesterification process can be used, for example, to produce a product with a lower calorie content via the substitution of longer-chain fatty acids with shorter-chain counterparts. Directed interesterification can also be used to produce a product with a mixture of fats that can provide desired melting characteristics and structural features sought in food additives or products (e.g., margarine) without resorting to hydrogenation, which can produce unwanted trans isomers.
Interesterification of oils produced by the methods described herein can be performed in conjunction with one or more of the methods and/or materials, or to produce products, as reported in the following: U.S. Pat. No. 6,080,853 (Nondigestible fat substitutes); U.S. Pat. No. 4,288,378 (Peanut butter stabilizer); U.S. Pat. No. 5,391,383 (Edible spray oil); U.S. Pat. No. 6,022,577 (Edible fats for food products); U.S. Pat. No. 5,434,278 (Edible fats for food products); U.S. Pat. No. 5,268,192 (Low calorie nut products); U.S. Pat. No. 5,258,197 (Reduce calorie edible compositions); U.S. Pat. No. 4,335,156 (Edible fat product); U.S. Pat. No. 7,288,278 (Food additives or medicaments); U.S. Pat. No. 7,115,760 (Fractionation process); U.S. Pat. No. 6,808,737 (Structural fats); U.S. Pat. No. 5,888,947 (Engine lubricants); U.S. Pat. No. 5,686,131 (Edible oil mixtures); and U.S. Pat. No. 4,603,188 (Curable urethane compositions).
In one embodiment in accordance with the invention, transesterification of the oil, as described above, is followed by reaction of the transesterified product with polyol, as reported in U.S. Pat. No. 6,465,642, to produce polyol fatty acid polyesters. Such an esterification and separation process may comprise the steps as follows: reacting a lower alkyl ester with polyol in the presence of soap; removing residual soap from the product mixture; water-washing and drying the product mixture to remove impurities; bleaching the product mixture for refinement; separating at least a portion of the unreacted lower alkyl ester from the polyol fatty acid polyester in the product mixture; and recycling the separated unreacted lower alkyl ester.
Transesterification can also be performed on microbial biomass with short chain fatty acid esters, as reported in U.S. Pat. No. 6,278,006. In general, transesterification may be performed by adding a short chain fatty acid ester to an oil in the presence of a suitable catalyst and heating the mixture. In some embodiments, the oil comprises about 5% to about 90% of the reaction mixture by weight. In some embodiments, the short chain fatty acid esters can be about 10% to about 50% of the reaction mixture by weight. Nonlimiting examples of catalysts include base catalysts, sodium methoxide, acid catalysts including inorganic acids such as sulfuric acid and acidified clays, organic acids such as methane sulfonic acid, benzenesulfonic acid, and toluenesulfonic acid, and acidic resins such as Amberlyst 15. Metals such as sodium and magnesium, and metal hydrides also are useful catalysts.
Another such chemical modification is hydroxylation, which involves the addition of water to a double bond resulting in saturation and the incorporation of a hydroxyl moiety. The hydroxylation process provides a mechanism for converting one or more fatty acid constituents of a glycerolipid to a hydroxy fatty acid. Hydroxylation can be performed, for example, via the method reported in U.S. Pat. No. 5,576,027. Hydroxylated fatty acids, including castor oil and its derivatives, are useful as components in several industrial applications, including food additives, surfactants, pigment wetting agents, defoaming agents, water proofing additives, plasticizing agents, cosmetic emulsifying and/or deodorant agents, as well as in electronics, pharmaceuticals, paints, inks, adhesives, and lubricants. One example of how the hydroxylation of a glyceride may be performed is as follows: fat may be heated, preferably to about 30-50° C. combined with heptane and maintained at temperature for thirty minutes or more; acetic acid may then be added to the mixture followed by an aqueous solution of sulfuric acid followed by an aqueous hydrogen peroxide solution which is added in small increments to the mixture over one hour; after the aqueous hydrogen peroxide, the temperature may then be increased to at least about 60° C. and stirred for at least six hours; after the stirring, the mixture is allowed to settle and a lower aqueous layer formed by the reaction may be removed while the upper heptane layer formed by the reaction may be washed with hot water having a temperature of about 60° C.; the washed heptane layer may then be neutralized with an aqueous potassium hydroxide solution to a pH of about 5 to 7 and then removed by distillation under vacuum; the reaction product may then be dried under vacuum at 100° C. and the dried product steam-deodorized under vacuum conditions and filtered at about 50° to 60° C. using diatomaceous earth.
Hydroxylation of microbial oils produced by the methods described herein can be performed in conjunction with one or more of the methods and/or materials, or to produce products, as reported in the following: U.S. Pat. No. 6,590,113 (Oil-based coatings and ink); U.S. Pat. No. 4,049,724 (Hydroxylation process); U.S. Pat. No. 6,113,971 (Olive oil butter); U.S. Pat. No. 4,992,189 (Lubricants and lube additives); U.S. Pat. No. 5,576,027 (Hydroxylated milk); and U.S. Pat. No. 6,869,597 (Cosmetics).
Hydroxylated glycerolipids can be converted to estolides. Estolides consist of a glycerolipid in which a hydroxylated fatty acid constituent has been esterified to another fatty acid molecule. Conversion of hydroxylated glycerolipids to estolides can be carried out by warming a mixture of glycerolipids and fatty acids and contacting the mixture with a mineral acid, as described by Isbell et al., JAOCS 71(2):169-174 (1994). Estolides are useful in a variety of applications, including without limitation those reported in the following: U.S. Pat. No. 7,196,124 (Elastomeric materials and floor coverings); U.S. Pat. No. 5,458,795 (Thickened oils for high-temperature applications); U.S. Pat. No. 5,451,332 (Fluids for industrial applications); U.S. Pat. No. 5,427,704 (Fuel additives); and U.S. Pat. No. 5,380,894 (Lubricants, greases, plasticizers, and printing inks).
Another such chemical modification is olefin metathesis. In olefin metathesis, a catalyst severs the alkylidene carbons in an alkene (olefin) and forms new alkenes by pairing each of them with different alkylidine carbons. The olefin metathesis reaction provides a mechanism for processes such as truncating unsaturated fatty acid alkyl chains at alkenes by ethenolysis, cross-linking fatty acids through alkene linkages by self-metathesis, and incorporating new functional groups on fatty acids by cross-metathesis with derivatized alkenes.
In conjunction with other reactions, such as transesterification and hydrogenation, olefin metathesis can transform unsaturated glycerolipids into diverse end products. These products include glycerolipid oligomers for waxes; short-chain glycerolipids for lubricants; homo- and hetero-bifunctional alkyl chains for chemicals and polymers; short-chain esters for biofuel; and short-chain hydrocarbons for jet fuel. Olefin metathesis can be performed on triacylglycerols and fatty acid derivatives, for example, using the catalysts and methods reported in U.S. Pat. No. 7,119,216, US Patent Pub. No. 2010/0160506, and U.S. Patent Pub. No. 2010/0145086.
Olefin metathesis of bio-oils generally comprises adding a solution of Ru catalyst at a loading of about 10 to 250 ppm under inert conditions to unsaturated fatty acid esters in the presence (cross-metathesis) or absence (self-metathesis) of other alkenes. The reactions are typically allowed to proceed from hours to days and ultimately yield a distribution of alkene products. One example of how olefin metathesis may be performed on a fatty acid derivative is as follows: A solution of the first generation Grubbs Catalyst (dichloro[2(1-methylethoxy-α-O)phenyl]methylene-α-C] (tricyclohexyl-phosphine) in toluene at a catalyst loading of 222 ppm may be added to a vessel containing degassed and dried methyl oleate. Then the vessel may be pressurized with about 60 psig of ethylene gas and maintained at or below about 30° C. for 3 hours, whereby approximately a 50% yield of methyl 9-decenoate may be produced.
Olefin metathesis of oils produced by the methods described herein can be performed in conjunction with one or more of the methods and/or materials, or to produce products, as reported in the following: Patent App. PCT/US07/081,427 (α-olefin fatty acids) and U.S. patent application Ser. No. 12/281,938 (petroleum creams), Ser. No. 12/281,931 (paintball gun capsules), Ser. No. 12/653,742 (plasticizers and lubricants), Ser. No. 12/422,096 (bifunctional organic compounds), and Ser. No. 11/795,052 (candle wax).
Other chemical reactions that can be performed on microbial oils include reacting triacylglycerols with a cyclopropanating agent to enhance fluidity and/or oxidative stability, as reported in U.S. Pat. No. 6,051,539; manufacturing of waxes from triacylglycerols, as reported in U.S. Pat. No. 6,770,104; and epoxidation of triacylglycerols, as reported in “The effect of fatty acid composition on the acrylation kinetics of epoxidized triacylglycerols”, Journal of the American Oil Chemists' Society, 79:1, 59-63, (2001) and Free Radical Biology and Medicine, 37:1, 104-114 (2004).
The generation of oil-bearing microbial biomass for fuel and chemical products as described above results in the production of delipidated biomass meal. Delipidated meal is a byproduct of preparing algal oil and is useful as animal feed for farm animals, e.g., ruminants, poultry, swine and aquaculture. The resulting meal, although of reduced oil content, still contains high quality proteins, carbohydrates, fiber, ash, residual oil and other nutrients appropriate for an animal feed. Because the cells are predominantly lysed by the oil separation process, the delipidated meal is easily digestible by such animals. Delipidated meal can optionally be combined with other ingredients, such as grain, in an animal feed. Because delipidated meal has a powdery consistency, it can be pressed into pellets using an extruder or expander or another type of machine, which are commercially available.
The triglyceride oils provided herein also find use in the preparation of fexible foam polyurethanes.
In one embodiment, provided is a method for preparing a polyurethane foam, the method comprising:

    
    
        a) providing a microalgal oil comprising triacylglycerides having a fatty acid profile of at least 80% 18:1 fatty acids and less than 4% 18:2 fatty acids, the triglycerides further having an iodine value of 75 or less and/or is non-hydrogenated;
        b) subjecting the triacylglycerides to an epoxidation reaction to form epoxides;
        c) subjecting the epoxides to a ring opening reaction to form microalgal derived polyols, wherein the microalgal derived polyols are liquids at room temperature;
        d) blending the microalgal derived polyols with petroleum derived polyols to form blended polyols; and
        e) subjecting the blended polyols to an isocyanate condensation reaction to form the polyurethane foam.
    
    


In some embodiments, the polyurethane foam has less than 25% loss in thickness after being compressed to 75% thickness at 70° C. and 5% relative humidity for 22 hours in accordance with American Society for Testing and Materials standard ASTM D-3574. In some embodiments, the loss in thickness is less than a 20%. In other embodiments, the loss in thickness is less than a 15%.
In some embodiments, the polyurethane foam is resistant to yellowing. In some embodiments, the polyurethane foam maintains a yellowness index of 31 or less after being exposed to ambient light for 18 weeks in accordance with American Society for Testing and Materials standard ASTM D-E313.
In some embodiments, the triacylglycerides have an iodine value of 70-75. In some embodiments, the triacylglycerides have an iodine value of 74-75. The iodine value provides a measure of the degree of unsaturation, and is the amount of grams of iodine that will react with 100 grams of sample.
In some embodiments, the polyurethane foam is prepared from the triacylglycerides having a fatty acid profile of have less than 1%, less than 0.1%, or less than 0.01% trans fatty acids or wherein the triacylglyceride is non-hydrogenated.
In some embodiments, the triacylglycerides have a fatty acid profile of less than 3%, 2%, less than 1%, less than 0.1%, less than 0.01%, or less than 0.001% 18:2 fatty acids. In some embodiments, the polyurethane foam is prepared from the triacylglycerides having a fatty acid profile of have less than 0.01% trans fatty acids and less than 0.1% or less than 0.01% 18:2 fatty acids.
In some embodiments, the triacylglycerides have a fatty acid profile of less than 15%, less than 14%, less than 13%, less than 12%, less than 11%, or less than 10% saturated fatty acids.
In some embodiments, the triacylglycerides have a fatty acid profile of less than 5%, less than 4%, less than 3%, or less than 2% 18:0 fatty acids.
In some embodiments, the polyurethane foam is prepared from the triacylglycerides having a fatty acid profile of at least 85% 18:1 fatty acids.
In some embodiments, the triacylglycerides having a fatty acid profile of at least 85% 18:1 fatty acids and 1% or less 18:2 fatty acids.
In some embodiments, the triacylglycerides having a fatty acid profile of at least 85% 18:1 fatty acids and 0.1% or less 18:2 fatty acids.
In some embodiments, microalgal oil is obtained from microalgae cultivated under heterotrophic conditions. In some embodiments the microalgal oil comprises C29 and C28 sterols, wherein the amount of C28 sterols is greater than C29 sterols. In some embodiments the microalgal is Parachlorella, Prototheca, or Chlorella. In some embodiments the microalgae is Prototheca. In some embodiments the microalgae is Prototheca moriformis. In some embodiments, the microalgal oil is obtained from a microalgae comprising recombinant nucleic acids operable to reduce the activity a Δ12 fatty acid desaturase. In other embodiments the microalgae further comprises recombinant nucleic acids operable to reduce the activity a FATA thioesterase.
In some embodiments, the polyurethane foam is prepared by subjecting triacylglycerides provided herein to an epoxidation reaction to form epoxides; subjecting the epoxides to an epoxide ring opening reaction to form polyol intermediates that are substantially free from solids at room temperature; and subjecting the polyol intermediates to a condensation reaction with an isocyanate to form polyurethanes. In some embodiments, the epoxide ring opening reaction comprises treatment of the epoxides with methanol.
In the epoxidation reactions the triacylglycerides are exposed to an oxidant such as a peroxyacid or hydroperoxide. Examples of peroxyacid that may be used include peroxyformic acid, peroxyacetic acid, trifluoroperoxyacetic acid, benzyloxyperoxyformic acid, 3,5-dinitroperoxybenzoic acid, m-chloroperoxybenzoic acid, and combinations thereof. The peroxy acid may be added directly to the reaction, or may be formed in-situ by reacting a hydroperoxide compound with an acid such as formic acid, benzoic acid, acetic acid or fatty acids such as oleic acid. Examples of typical hydroperoxides that may be utilized include hydrogen peroxide, tert-butylhydroperoxide, triphenysilylhydroperoxide, cumylhydroperoxide, and combinations thereof. Most preferably hydrogen peroxide will be used. Preferably, the amount of acid used to form the peroxyacid is from about 0.25 to about 1.0 moles of acid per mole of carbon-carbon double bonds in the oil, and more preferably from about 0.45 to about 0.55 moles of acid per mole of carbon-carbon double bonds in the oil. Preferably, the amount of hydroperoxide used to form the peroxy acid is 0.5 to 1.5 moles of hydroperoxide per mole of double bonds in the oil, and more preferably 0.8 to 1.2 moles of hydroperoxide per mole of double bonds in the oil.
The fully-epoxidized oil is reacted with a ring opener under suitable conditions to provide a polyol. A ring-opening catalyst is typically utilized. The ring-opening catalyst preferably is an acid catalyst. Representative examples of ring-opening acid catalysts include Lewis acids and Bronsted acids. Examples of Bronsted acids include hydrofluoroboric acid (HBF4), trifluoroacetic acid, sulfuric acid, hydrochloric acid phosphoric acid, phosphorous acid, hypophosphorous acid, boronic acids, sulfonic acids (for example, para-toluene sulfonic acid, methanesulfonic acid, and trifluoromethane sulfonic acid), and carboxylic acids (for example, formic acid and acetic acid). Other examples of acids include fluoroboric acid (tetrafluoroboric acid, H3OBF4) and copper tetrafluoroborate. Examples of Lewis acids include phosphorous trichloride and boron halides (for example, boron trifluoride). Ion exchange resins in the protic form may also be used. The ring-opening catalyst is typically present in an amount ranging from 0.01 wt % to 0.3 wt %, preferably from about 0.05 wt % to 0.15 wt %, based on the total weight of the reaction mixture.
The ring-opener may include alcohols, water, and other compounds having one or more nucleophilic groups. Combinations of ring-openers may be used. Exemplary ring openers include C1-C4 monohydric alcohols, monoalkyl ethers of ethylene glycol (e.g. methyl cellosolve, butyl cellosolve, and the like). Preferably, monohydric alcohols having between one and six carbon atoms are utilized, more preferably one to four carbon atoms, further more preferably methanol, ethanol, or propanol, most preferably methanol. Also, mono- and di-carboxylic acids may be used. For example, mono-carboxylic acids, such as formic acid, acetic acid, proprionic acid, and butyric acid. Also, polyols may be utilized as the ring opener. Polyols having two or less hydroxyl groups per molecule are preferred. Examples of preferable polyols include ethylene glycol, propylene glycol, 1,3 propanediol, buylene-glycol, 1,4-butane diol, 1,5-pentanediol, 1,6-hexanediol, polyethylene glycol and polypropylene glycol, and vegetable oil-based polyols (for example, polyols as described in U.S. Pat. No. 6,433,121). Also, during the ring opening reaction the polyols created during the ring opening reaction will react with each other to polymerize and form oligomers.
In some embodiments the microalgal derived polyols are non-hazy liquids substantially free from solids. In some embodiments the microalgal derived polyols comprise at least 20% by weight of the blended polyols. In some embodiments the microalgal derived polyols comprise 20 to 50% by weight of the blended polyols.
In some embodiments, the petroleum derived polyols are polyether polyols. Petroleum-derived polyols include polyether polyols and polyester polyols. Polyether polyols and polyester polyols are known to one of skill in the art. Polyether polyols are preferably utilized. Examples of polyether polyols include polyols sold under the marks JEFFOL (available from Huntsman), VORANOL (available from The Dow Chemical Company), PLURACOL and PLURACEL (available from BASF), ARCOL, HYPERLITE, MUTRANOL, ULTRACEL, SOFTCELL, and ACCLAIM (available from the Bayer Corporation), and CARADOL (available from Shell Chemicals).
In some embodiments, the polyols are mixed with a catalyst prior to the isocyanate condensation reaction. Exemplary catalysts include tertiary amine compounds and organometallic compounds. Specific examples of useful tertiary amine compounds include triethylenediamine, N-methylmorpholine, N-ethylmorpholine, diethyl ethanolamine, N-coco morpholine, 1-methyl-4-dimethylaminoethyl piperazine, 3-methoxy-N-dimethylpropylamine, N,N-diethyl-3diethylaminopropylamine, dimethylbenzyl amine, bis(2-dimethylaminoethyl)ether, and the like. Tertiary amine catalysts are advantageously used in an amount from 0.01 to 5 parts, preferably from 0.05 to 2 parts per hundred (100) parts by weight of the active hydrogen-containing composition in the formulation. Specific examples of useful organometallic catalysts include organic salts of metals such as tin, bismuth, iron, zinc, and the like. Organotin catalysts are preferred. Examples of organotin catalysts include dimethyltindilaurate, dibutyltindilaurate, and stannous octoate. Other preferred catalyst include those disclosed in U.S. Pat. No. 2,846,408, which is hereby incorporated by reference for its teachings regarding organometallic catalysts useful for polyurethane reactions. Preferably, 0.001 to 1.0 parts by weight of an organometallic catalyst is used per hundred (100) parts by weight of the active hydrogen-containing composition in the formulation. In some embodiments, the catalyst is an amine catalyst. In some embodiments, the amine catalyst is a diethanolamine catalyst. In some embodiments, the mole ratio of the amine catalyst to the microalgal polyol is greater than 3:1.
The polyurethanes provided herein can also be prepared with and/or contain additives, alcohols, blowing agents, and surfactants. Additives include release agents, antioxidants, flame retardant additives, cell size control agents, cell opening agents, colorants, preservatives, static dissipative agents, plasticizers, and crosslinking agents. Blowing agents include low temperature boiling point solvents (e.g. low molecular weight organic compounds such as halogenated alkanes, acetone, and isopentane) for generating gases to expand the polyurethane foam during its synthesis. In some embodiments the surfactant is a silicon surfactant.
Methods and components for forming polyurethanes can also be found in US 2005/0282921.
In some embodiments, the polyurethanes provided herein contain fillers to increase foam density. Suitable fillers include inorganic materials such as barium sulfate, sand, or clay.
In some embodiments, the polyurethane foams provided herein are flexible slabstock foam.
In some embodiments, provided is an article comprising a polyurethane foam provided herein. In some embodiments the article is a support or safety application selected from seat cushion, seat backing, headrest, armrest, automotive headliner, automotive soft instrument panel, mattress, pillow, carpet backing, packaging, sports equipment, and helmet liner.
In some embodiments, the polyurethane foams provided herein find use as seat cushions and in automotive applications.
The invention, having been described in detail above, is exemplified in the following examples, which are offered to illustrate, but not to limit, the claimed invention.
XIV. Examples
Example 1
Fatty Acid Analysis by Fatty Acid Methyl Ester Detection
Lipid samples were prepared from dried biomass. 20-40 mg of dried biomass was resuspended in 2 mL of 5% H2SO4 in MeOH, and 200 ul of toluene containing an appropriate amount of a suitable internal standard (C19:0) was added. The mixture was sonicated briefly to disperse the biomass, then heated at 70-75° C. for 3.5 hours. 2 mL of heptane was added to extract the fatty acid methyl esters, followed by addition of 2 mL of 6% K2CO3 (aq) to neutralize the acid. The mixture was agitated vigorously, and a portion of the upper layer was transferred to a vial containing Na2SO4 (anhydrous) for gas chromatography analysis using standard FAME GC/FID (fatty acid methyl ester gas chromatography flame ionization detection) methods. Fatty acid profiles reported below were determined by this method.
Example 2
Triacylglyceride Purification from Oil and Methods for Triacylglyceride Lipase Digestion
The triacylglyceride (TAG) fraction of each oil sample was isolated by dissolving  ̃10 mg of oil in dichloromethane and loading it onto a Bond-Elut aminopropyl solid-phase extraction cartridge (500 mg) preconditioned with heptane. TAGs were eluted with dicholoromethane-MeOH (1:1) into a collection tube, while polar lipids were retained on the column. The solvent was removed with a stream of nitrogen gas. Tris buffer and 2 mg porcine pancreatic lipase (Type II, Sigma, 100-400 units/mg) were added to the TAG fraction, followed by addition of bile salt and calcium chloride solutions. The porcine pancreatic lipase cleaves sn-1 and sn-3 fatty acids, thereby generating 2-monoacylglycerides and free fatty acids. This mixture was heated with agitation at 40° C. for three minutes, cooled briefly, then quenched with 6 N HCl. The mixture was then extracted with diethyl ether and the ether layer was washed with water then dried over sodium sulfate. The solvent was removed with a stream of nitrogen. To isolate the monoacylglyceride (MAG) fraction, the residue was dissolved in heptane and loaded onto a second aminopropyl solid phase extraction cartridge pretreated with heptane. Residual TAGs were eluted with diethyl ether-dichloromethane-heptane (1:9:40), diacylglycerides (DAGs) were eluted with ethyl acetate-heptane (1:4), and MAGs were eluted from the cartridge with dichloromethane-methanol (2:1). The resulting MAG, DAG, and TAG fractions were then concentrated to dryness with a stream of nitrogen and subjected to routine direct transesterification method of GC/FID analysis as described in Example 1.
Example 3
Engineering Microorganisms for Fatty Acid and Sn-2 Profiles Increased in Lauric Acid Through Exogenous LPAAT Expression
This example describes the use of recombinant polynucleotides that encode a C. nucifera 1-acyl-sn-glycerol-3-phosphate acyltransferase (Cn LPAAT) enzyme to engineer a microorganism in which the fatty acid profile and the sn-2 profile of the transformed microorganism has been enriched in lauric acid.
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain A, was initially transformed with the plasmid construct pSZ1283 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. pSZ1283, described in PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696 hereby incorporated by reference, comprised the coding sequence of the Cuphea wrightii FATB2 (CwTE2) thioesterase (SEQ ID NO: 10), 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4), to express the protein sequence given in SEQ ID NO: 3, under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. The CwTE2 protein coding sequence to express the protein sequence given in SEQ ID NO: 11, was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR. The protein coding regions of CwTE2 and suc2 were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Upon transformation of pSZ1283 into Strain A, positive clones were selected on agar plates with sucrose as the sole carbon source. Primary transformants were then clonally purified and a single transformant, Strain B, was selected for further genetic modification. This genetically engineered strain was transformed with plasmid construct pSZ2046 to interrupt the pLoop genomic locus of Strain B. Construct pSZ2046 comprised the coding sequence of the C. nucifera 1-acyl-sn-glycerol-3-phosphate acyltransferase (Cn LPAAT) enzyme (SEQ ID NO: 12), 5′ (SEQ ID NO: 13) and 3′ (SEQ ID NO: 14) homologous recombination targeting sequences (flanking the construct) to the pLoop genomic region for integration into the nuclear genome, and a neomycin resistance protein-coding sequence under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5), and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This NeoR expression cassette is listed as SEQ ID NO: 15 and served as a selectable marker. The Cn LPAAT protein coding sequence was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR. The protein coding regions of Cn LPAAT and NeoR were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. The amino acid sequence of Cn LPAAT is provided as SEQ ID NO: 16.
Upon transformation of pSZ2046 into Strain B, thereby generating Strain C, positive clones were selected on agar plates comprising G418 (Geneticin). Individual transformants were clonally purified and grown at pH 7.0 under conditions suitable for lipid production as detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass from each transformant and fatty acid profiles from these samples were analyzed using standard fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis UTEX 1435 (U1) grown on glucose as a sole carbon source, untransformed Strain B and five pSZ2046 positive transformants (Strain C, 1-5) are presented in Table 6.







TABLE 6







Effect of LPAAT expression on fatty acid profiles of transformed


Prototheca moriformis (UTEX 1435) comprising a mid-chain preferring thioesterase.














Area %


Strain 
Strain 
Strain 
Strain 
Strain 


Fatty acid
U1
Strain B
C-1
C-2
C-3
C-4
C-5

















C10:0
0.01
5.53
11.37
11.47
10.84
11.13
11.12


C12:0
0.04
31.04
46.63
46.47
45.84
45.80
45.67


C14:0
1.27
15.99
15.14
15.12
15.20
15.19
15.07


C16:0
27.20
12.49
7.05
7.03
7.30
7.20
7.19


C18:0
3.85
1.30
0.71
0.72
0.74
0.74
0.74


C18:1
58.70
24.39
10.26
10.41
10.95
11.31
11.45


C18:2
7.18
7.79
7.05
6.93
7.30
6.88
7.01


C10-C12
0.50
36.57
58.00
57.94
56.68
56.93
56.79









As shown in Table 6, the fatty acid profile of Strain B expressing CwTE2 showed increased composition of C10:0, C12:0, and C14:0 fatty acids and a decrease in C16:0, C18:0, and C18:1 fatty acids relative to the fatty acid profile of the untransformed UTEX 1435 strain. The impact of additional genetic modification on the fatty acid profile of the transformed strains, namely the expression of CnLPAAT in Strain B, is a still further increase in the composition of C10:0 and C12:0 fatty acids, a still further decrease in C16:0, C18:0, and C18:1 fatty acids, but no significant effect on the C14:0 fatty acid composition. These data indicate that the CnLPAAT shows substrate preference in the context of a microbial host organism.
The untransformed P. moriformis Strain A is characterized by a fatty acid profile comprising less than 0.5% C12 fatty acids and less than 1% C10-C12 fatty acids. In contrast, the fatty acid profile of Strain B expressing a C. wrightii thioesterase comprised 31% C12:0 fatty acids, with C10-C12 fatty acids comprising greater than 36% of the total fatty acids. Further, fatty acid profiles of Strain C, expressing a higher plant thioesterase and a CnLPAAT enzyme, comprised between 45.67% and 46.63% C12:0 fatty acids, with C10-C12% fatty acids comprising between 71 and 73% of total fatty acids. The result of expressing an exogenous thioesterase was a 62-fold increase in the percentage of C12 fatty acid present in the engineered microbe. The result of expressing an exogenous thioesterase and exogenous LPAAT was a 92-fold increase in the percentage of C12 fatty acids present in the engineered microbe.
The TAG fraction of oil samples extracted from Strains A, B, and C were analyzed for the sn-2 profile of their triacylglycerides. The TAGs were extracted and processed as described in Example 2 and analyzed as in Examples 1 and 2. The fatty acid composition and the sn-2 profiles of the TAG fraction of oil extracted from Strains A, B, and C (expressed as Area % of total fatty acids) are presented in Table 7. Values not reported are indicated as “n.r.”







TABLE 7







Effect of LPAAT expression on the fatty acid composition and the sn-2


profile of TAGs produced from transformed Prototheca moriformis (UTEX 1435) 


comprising a mid-chain preferring thioesterase.










Strain
Strain A
Strain B
Strain C


Area %
(untransformed)
(pSZ1500)
(pSZ1500 + pSZ2046)













fatty acid
FA
sn-2 profile
FA
sn-2 profile
FA
sn-2 profile
















C10:0
n.r.
n.r.
11.9
14.2
12.4
7.1


C12:0
n.r.
n.r.
42.4
25
47.9
52.8


C14:0
1.0
0.6
12
10.4
13.9
9.1


C16:0
23.9
1.6
7.2
1.3
6.1
0.9


C18:0
3.7
0.3
n.r
n.r.
0.8
0.3


C18:1
64.3
90.5
18.3
36.6
9.9
17.5


C18:2
4.5
5.8
5.8
10.8
6.5
10


C18:3
n.r.
n.r.
n.r.
n.r.
1.1
1.6









As shown in Table 7, the fatty acid composition of triglycerides (TAGs) isolated from Strain B expressing CwTE2 was increased for C10:0, C12:0, and C14:0 fatty acids and decrease in C16:0 and C18:1 fatty acids relative to the fatty acid profile of TAGs isolated from untransformed Strain A. The impact of additional genetic modification on the fatty acid profile of the transformed strains, namely the expression of CnLPAAT, was a still further increase in the composition of C10:0 and C12:0 fatty acids, a still further decrease in C16:0, C18:0, and C18:1 fatty acids, but no significant effect on the C14:0 fatty acid composition. These data indicate that expression of the exogenous CnLPAAT improves the midchain fatty acid profile of transformed microbes.
The untransformed P. moriformis Strain A is characterized by an sn-2 profile of about 0.6% C14, about 1.6% C16:0, about 0.3% C18:0, about 90% C18:1, and about 5.8% C18:2. In contrast to Strain A, Strain B, expressing a C. wrightii thioesterase is characterized by an sn-2 profile that is higher in midchain fatty acids and lower in long chain fatty acids. C12 fatty acids comprised 25% of the sn-2 profile of Strain B. The impact of additional genetic modification on the sn-2 profile of the transformed strains, namely the expression of CnLPAAT, was still a further increase in C12 fatty acids (from 25% to 52.8%), a decrease in C18:1 fatty acids (from 36.6% to 17.5%), and a decrease in C10:0 fatty acids. (The sn-2 profile composition of C14:0 and C16:0 fatty acids was relatively similar for Strains B and C.)
These data demonstrate the utility and effectiveness of polynucleotides permitting exogenous LPAAT expression to alter the fatty acid profile of engineered microorganisms, and in particular in increasing the concentration of C10:0 and C12:0 fatty acids in microbial cells. These data further demonstrate the utility and effectiveness of polynucleotides permitting exogenous thioesterase and exogenous LPAAT expression to alter the sn-2 profile of TAGs produced by microbial cells, in particular in increasing the C12 composition of sn-2 profiles and decreasing the C18:1 composition of sn-2 profiles.
Example 4
Thermal Behavior of Oils Produced from Recombinant Microalgae
FIGS. 1-14 include fatty acid profiles and melting curves of refined, bleached and deodorized oils from genetically engineered Prototheca moriformis strains. In some cases, modifications of the melting curves are obtained via genetic engineering. For example, some of the oils produced have shallower or sharper melting transitions relative to control microalgal oils (i.e., those produced from strains lacking a given genetic modification) or relative to widely available plant oils. In addition, FIG. 12 shows scanning calorimetry for a high palmitic oil when tempered by holding at room temperature for several days (lower trace) and for the same oil after performing the first scan (upper trace). The scans ranged from −60° C. to +50° C. with a heating rate of 10° C./minute. The differences between the two traces suggests that tempering of the oil caused a change in crystal structure within the oil.
Also of note, FIGS. 10 and 11 show stability testing of RBD-5 and RBD 6. Remarkably, RBD-6, an oil with less than 0.1% 18:2 and 18:3 fatty acids was substantially stable as measured by the oxidative stability index (AOCS Method Cd 12b-92) even after 36 hours of heating at 110° C.
Table 8, below, gives details of the genetic engineering of the strains identified in FIGS. 1-13.







TABLE 8





Genetically engineered strains.
















RB Z
Ulmus Americana thioesterase


RBD-1
Cuphea wrightii FATB2 thioesterase driven by amt03


RBD-2
Ulmus americana thioesterase


RBD-3
Native C. hookeriana C16:0-specific thioesterase with



amt03 promoter


RBD Y
Ulmus Americana thioesterase with Btub promoter


RBD X
SAD2B knockout with native C wrightii FAT2B thioesterase,



amt03 promoter


RBD W
SAD2B KO with Native C. wrightii FATB2 driven by amt03



at insertion site


RBD-4
control strain


RBD-5
FATA-1 knockout with Carthamus oleate sp. TE driven by



amt03 promoter at insertion site


RBD-6
FADc knockout with Carthamus tinctorius oleoyl thioesterase









Example 5
Characteristics of Processed Oil Produced from Engineered Microorganisms
Methods and effects of transforming Prototheca moriformis (UTEX 1435) with transformation vector pSZ1500 (SEQ ID NO: 17) have been previously described in PCT Application Nos. PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
A classically mutagenized (for higher oil production) derivative of Prototheca moriformis (UTEX 1435), Strain A, was transformed with pSZ1500 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. pSZ1500 comprised nucleotide sequence of the Carthamus tinctorius oleyl-thioesterase (CtOTE) gene, codon-optimized for expression in P. moriformis UTEX 1435. The pSZ1500 expression construct included 5′ (SEQ ID NO: 18) and 3′ (SEQ ID NO: 19) homologous recombination targeting sequences (flanking the construct) to the FADc genomic region for integration into the nuclear genome and a S. cerevisiae suc2 sucrose invertase coding region under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selection marker. The CtOTE coding region was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR, and the native transit peptide was replaced with the C. protothecoides stearoyl-ACP desaturase transit peptide (SEQ ID NO: 9). The protein coding regions of CtOTE and suc2 were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Primary pSZ1500 transformants of Strain A were selected on agar plates containing sucrose as a sole carbon source, clonally purified, and a single engineered line, Strain D was selected for analysis. Strain D was grown as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Hexane extraction of the oil from the generated biomass was then performed using standard methods, and the resulting triglyceride oil was determined to be free of residual hexane. Other methods of extraction of oil from microalgae using an expeller press are described in PCT Application No. PCT/US2010/031108 and are hereby incorporated by reference.
Different lots of oil extracted from biomass of Strain D were refined, bleached, and deodorized using standard vegetable oil processing methods. These procedures generated oil samples RBD437, RBD469, RBD501, RBD 502, RBD503, and RBD529, which were subjected to analytical testing protocols according to methods defined through the American Oil Chemists' Society, the American Society for Testing and Materials, and the International Organization for Standardization. The results of these analyses are summarized below in Tables 9-14.







TABLE 9







Analytical results for oil sample RBD469.










Method Number
Test Description
Results
Units













AOCS Ca 3a-46
Insoluble impurities
<0.01
%


AOCS Ca 5a-40
Free Fatty Acids (Oleic)
0.02
%


AOCS Ca 5a-40
Acid Value
0.04
mg





KOH/g


AOCS CA 9f-57
Neutral oil
98.9
%


D97
Cloud Point
−15
deg C.


D97
Pour Point
−18
deg C.



Karl Fischer Moisture
0.01
%


AOCS Cc 13d-55
Chlorophyll
<0.01
ppm


(modified)



Iodine Value
78.3
g I2/100 g


AOCS Cd 8b-90
Peroxide Value
0.31
meq/kg


ISO 6885
p-Anisidine Value
0.65


AOCS Cc 18-80
Dropping Melting point
6.2
deg C.



(Mettler)


AOCS Cd 11d-96
Triglycerides
98.6
%


AOCS Cd 11d-96
Monoglyceride
<0.01
%


AOCS Cd 11d-96
Diglycerides
0.68
%


AOCS Cd 20-91
Total Polar Compounds
2.62
%


IUPAC, 2.507 and
Oxidized & Polymerized
17.62
%


2.508
Triacylglycerides


AOCS Cc 9b-55
Flash Point
244
deg C.


AOCS Cc 9a-48
Smoke Point
232
deg C.


AOCS Cd 12b-92
Oxidative Stability Index
31.6
hours



Rancimat (110° C.)


AOCS Ca 6a-40
Unsaponified Matter
2.28
%









RBD469 oil was analyzed for trace element content, solid fat content, and Lovibond color according to AOCS methods. Results of these analyses are presented below in Table 10, Table 10, and Table 11.







TABLE 10







ICP Elemental Analysis of RBD469 oil.













Results in



Method Number
Test Description
ppm















AOCS Ca 20-99 and
Phosphorus
1.09



AOCS Ca 17-01
Calcium
0.1



(modified)
Magnesium
0.04




Iron
<0.02




Sulfur
28.8




Copper
<0.05




Potassium
<0.50




Sodium
<0.50




Silicon
0.51




Boron
0.06




Aluminum
<0.20




Lead
<0.20




Lithium
<0.02




Nickel
<0.20




Vanadium
<0.05




Zinc
<0.02




Arsenic
<0.20




Mercury
<0.20




Cadmium
<0.03




Chromium
<0.02




Manganese
<0.05




Silver
<0.05




Titanium
<0.05




Selenium
<0.50



UOP779
Chloride organic
<1



UOP779
Chloride inorganic
7.24



AOCS Ba 4e-93
Nitrogen
6.7

















TABLE 11







Solid Fat Content of RBD469 Oil











Method Number
Solid Fat Content
Result







AOCS Cd 12b-93
Solid Fat Content 10° C.
0.13%



AOCS Cd 12b-93
Solid Fat Content 15° C.
0.13%



AOCS Cd 12b-93
Solid Fat Content 20° C.
0.28%



AOCS Cd 12b-93
Solid Fat Content 25° C.
0.14%



AOCS Cd 12b-93
Solid Fat Content 30° C.
0.08%



AOCS Cd 12b-93
Solid Fat Content 35° C.
0.25%

















TABLE 12







Lovibond Color of RBD469 Oil












Method Number
Color
Result
Unit
















AOCS Cc 13j-97
red
2
Unit



AOCS Cc 13j-97
yellow
27
Unit










RBD469 oil was subjected to transesterification to produce fatty acid methyl esters (FAMEs). The resulting FAME profile of RBD469 is shown in Table 12.







TABLE 13







FAME Profile of RBD469 Oil










Fatty Acid
Area %














C10
0.01



C12:0
0.04



C14:0
0.64



C15:0
0.08



C16:0
8.17



C16:1 iso
0.39



C16:1
0.77



C17:0
0.08



C18:0
1.93



C18:1
35.88



C18:1 iso
0.05



C18:2
0.05



C20:0
0.3



C20:1
0.06



C20:1
0.44



C22:0
0.11



C23:0
0.03



C24:0
0.1



Total FAMES Identified
99.13










The oil stability indexes (OSI) of 6 RBD oil samples without supplemented antioxidants and 3 RBD oil samples supplemented with antioxidants were analyzed according to the Oil Stability Index AOCS Method Cd 12b-92. Shown in Table 14 are the results of OSI AOCS Cd 12b-92 tests, conducted at 110° C., performed using a Metrohm 873 Biodiesel Rancimat. Results, except where indicated with an asterisks (*), are the average of multiple OSI runs. Those samples not analyzed are indicated (NA).







TABLE 14







Oil Stability Index at 110° C. of RBD oil samples with and without


antioxidants.









Antioxidant
Antioxidant
OSI (hours) for each RBD Sample














added
Concentration
RBD437
RBD469
RBD502
RBD501
RBD503
RBD529

















None
0
65.41
38.33
72.10
50.32
63.04
26.68















Tocopherol &
35
ppm/
77.72
48.60
82.67
NA
NA
NA


Ascorbyl
16.7
ppm








Palmitate










Tocopherol &
140
ppm/
130.27 
81.54*
211.49*
NA
NA
NA


Ascorbyl
66.7
ppm








Palmitate










Tocopherol &
1050
ppm/
>157*  
>144
242.5*
NA
NA
NA


Ascorbyl
500
ppm








Palmitate










Tocopherol
50
ppm
NA
46.97
NA
NA
NA
NA


TBHQ
20
ppm
63.37
37.4
NA
NA
NA
NA









The untransformed P. moriformis (UTEX 1435) acid profile comprises less than 60% C18:1 fatty acids and greater than 7% C18:2 fatty acids. In contrast, Strain D (comprising pSZ1500) exhibited fatty acid profiles with an increased composition of C18:1 fatty acids (to above 85%) and a decrease in C18:2 fatty acids (to less than 0.06%). Upon refining, bleaching, and degumming, RBD oils samples prepared from the oil made from strain E exhibited OSI values >26 hrs. With addition of antioxidants, the OSI of RBD oils prepared from oils of Strain D increased from 48.60 hours to greater than 242 hours. In other experiments, OSI values of over 400 hours were achieved. Additional properties of a low polyunsaturated oil according to embodiments of the invention are given in FIG. 16.
Example 6
Improving the Levels of Oleic Acid of Engineered Microbes Through Allelic Disruption of a Fatty Acid Desaturase and an Acyl-Acp Thioesterase
This example describes the use of a transformation vector to disrupt a FATA locus of a Prototheca moriformis strain previously engineered for high oleic acid and low linoleic acid production. The transformation cassette used in this example comprised a selectable marker and nucleotide sequences encoding a P. moriformis KASII enzyme to engineer microorganisms in which the fatty acid profile of the transformed microorganism has been altered for further increased oleic acid and lowered palmitic acid levels.
Strain D, described in Example 5 and in PCT/US2012/023696, is a classically mutagenized (for higher oil production) derivative of P. moriformis (UTEX 1435) subsequently transformed with the transformation construct pSZ1500 (SEQ ID NO: 17) according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. This strain was used as the host for transformation with construct pSZ2276 to increase expression of a KASII enzyme while concomitantly ablating an endogenous acyl-ACP thioesterase genetic locus to generate Strain E. The pSZ2276 transformation construct included 5′ (SEQ ID NO: 20) and 3′ (SEQ ID NO: 21) homologous recombination targeting sequences (flanking the construct) to the FATA1 genomic region for integration into the P. moriformis nuclear genome, an A. thaliana THIC protein coding region under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This AtTHIC expression cassette is listed as SEQ ID NO: 23 and served as a selection marker. The P. moriformis KASII protein coding region was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR, and the native transit peptide of the KASII enzyme was replaced with the C. protothecoides stearoyl-ACP desaturase transit peptide (SEQ ID NO: 9). The codon-optimized sequence of PmKASII comprising a C. protothecoides S106 stearoyl-ACP desaturase transit peptide is provided the sequence listings as SEQ ID NO: 24. SEQ ID NO: 25 provides the protein translation of SEQ ID NO: 24. The protein coding regions of PmKASII and suc2 were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Primary pSZ2276 transformants of Strain D were selected on agar plates lacking thiamine, clonally purified, and a single engineered line, strain E was selected for analysis. Strain E was cultivated under heterotrophic lipid production conditions at pH5.0 and pH7.0 as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass from each transformant and fatty acid profiles from these samples were analyzed using standard fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. The fatty acid profiles (expressed as Area % of total fatty acids) from the transgenic line arising from transformation with pSZ2276 into Strain D are shown in Table 15.







TABLE 15







Fatty acid profiles of Prototheca moriformis (UTEX 1435) Strains A, D,


and E engineered for increased oleic acid and lowered linoleic acid levels.











Transformation

Area % Fatty Acid














Strain
Construct(s)
pH
C16:0
C18:0
C18:1
C18:2
C20:1

















Strain A
None
pH 5
26.6
3.3
60.5
6.7
0.07


Strain A
None
pH 7
28.3
4.1
58
6.5
0.06


Strain D
pSZ1500
pH 5
17
3.6
77.1
0.01
0.14


Strain D
pSZ1500
pH 7
19.5
5.3
72.6
0.01
0.09


Strain E
pSZ1500 +
pH 5
4.1
2.36
88.5
0.04
3.1



pSZ2276








Strain E
pSZ1500 +
pH 7
2.1
7.8
87.9
0.01
0.5



pSZ2276















As shown in Table 15, targeted interruption of FADc alleles with a CtOTE expression cassette impacted the fatty acid profiles of transformed microorganisms. Fatty acid profiles of Strain D (comprising the pSZ1500 transformation vector) showed increased composition of C18:1 fatty acids with a concomitant decrease in C16:0 and C18:2 fatty acids relative to Strain A. Subsequent transformation of Strain D with pSZ2276 to overexpress a P. moriformis (UTEX 1435) KASII protein while concomitantly ablating a FATA genetic locus (thereby generating Strain E) resulted in still further impact on the fatty acid profiles of the transformed microorganisms. Fatty acid profiles of Strain E showed increased composition of C18:1 fatty acids, with a further decrease in C16:0 fatty acids relative to Strains A and D. Propagation of Strain E in culture conditions at pH 7, to induce expression from the Amt03 promoter, resulted in a fatty acid profile that was higher in C18:0 and C18:1 fatty acids and lower in C16:0 fatty acids, relative to the same strain cultured at pH 5.
These data demonstrate the utility of multiple genetic modifications to impact the fatty acid profile of a host organism for increased levels of oleic acid with concomitant decreased levels of linoleic acid and palmitic acid. Further, this example illustrates the use of recombinant polynucleotides to target gene interruption of an endogenous FATA allele with a cassette comprising a pH-regulatable promoter to control expression of an exogenous KASII protein-coding region in order to alter the fatty acid profile of a host microbe.
Example 7
Conditional Expression of a Fatty Acid Desaturase
This example describes the use of a transformation vector to conditionally express a delta 12 fatty acid desaturase (FADs) in a Prototheca moriformis strain previously engineered for high oleic acid and very low linoleic acid production in both seed and lipid productivity stages of propagation. Very low linoleic acid levels in natural oils are sought for use in certain applications. However, absence of linoleic acid during cell division phase (“seed stage”) of a host microbe is disadvantageous. Linoleic acid may be supplemented to the seed medium to hasten cell division and not added during lipid production, but this addition imposes unwanted costs. To overcome this challenge, a transformation cassette was constructed for regulated expression of a FAD2 enzyme such that levels of linoleic acids sufficient for cell division could be achieved and oil with very low levels of linoleic acids could be produced during the oil production phase of culture of a microorganism. The transformation cassette used in this example comprised a selectable marker, a pH-regulatable promoter, and nucleotide sequences encoding a P. moriformis FAD2 enzyme to engineer microorganisms in which the fatty acid profile of the transformed microorganism has been altered for increased oleic acid production and regulatable linoleic acid production.
Strain D, described in Examples 5, 6, and in PCT/US2012/023696, is a classically mutagenized (for higher oil production) derivative of P. moriformis (UTEX 1435) subsequently transformed with the transformation construct pSZ1500 (SEQ ID NO: 17) according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. This strain was used as the host for transformation with construct pSZ2413 to introduce a pH-driven promoter for regulation of a P. moriformis FAD2 enzyme. The pSZ2413 transformation construct included 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the P. moriformis nuclear genome, an A. thaliana THIC protein coding region under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This AtTHIC expression cassette is listed as SEQ ID NO: 23 and served as a selection marker. The P. moriformis FAD2 protein coding region was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR. The codon-optimized sequence of PmFAD2 is provided the sequence listings as SEQ ID NO: 26. SEQ ID NO: 27 provides the protein translation of SEQ ID NO: 26. The protein coding regions of PmFAD2 and suc2 were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Primary pSZ2413 transformants of Strain D were selected on agar plates lacking thiamine, clonally purified, and isolates of the engineered line, Strain F were selected for analysis. These isolates were cultivated under heterotrophic lipid production conditions at pH7.0 (to activate expression of FAD2 from the PmAmt03 promoter) and at pH5.0, as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass from each transformant and fatty acid profiles from these samples were analyzed using standard fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. The resulting profile of C18:2 fatty acids (expressed in Area %) from nine representative isolates of transgenic Strain F (F-1 through F-9) arising from transformation with pSZ2413 into Strain D are shown in Table 16.







TABLE 16







C18:2 fatty acid profiles of Prototheca moriformis (UTEX 1435) Strains


A, D, and F.












Area %




Transformation
C18:2












Strain
Construct (s)
5.0
7.0







A
None
07
26



D
pSZ1500
01
01



F-1
pSZ1500 + pSZ2413
37
29



F-2
pSZ1500 + pSZ2413
45
87



F-3
pSZ1500 + pSZ2413
50
79



F-4
pSZ1500 + pSZ2413
57
06



F-5
pSZ1500 + pSZ2413
57
58



F-6
pSZ1500 + pSZ2413
60
88



F-7
pSZ1500 + pSZ2413
62
52



F-8
pSZ1500 + pSZ2413
63
79



F-9
pSZ1500 + pSZ2413
77
53










As shown in Table 16 the impact of regulated expression of the PmFAD2 enzyme, effected though strain culture at different pH levels, is a clear increase in the composition of C18:2 fatty acids in the transformed microorganism. Linoleic acid comprises about 6% to about 7.3% of fatty acids of Strain A. In contrast, Strain D (comprising the pSZ1500 transformation vector to ablate both FAD2 alleles) is characterized by a fatty acid profile of 0.01% linoleic acid. Transformation of Strain D with pSZ2413 to generate Strain F results in a recombinant microbe in which the production of linoleic acid is regulated by the Amt03 promoter. Propagation of Strain F isolates in culture conditions at pH 7, to induce FAD2 expression from the Amt03 promoter, resulted in a fatty acid profile characterized by about 4.5% to about 7.5% linoleic acid. In contrast, propagation of Strain F isolates in culture conditions at pH 5 resulted in a fatty acid profile characterized by about 0.33 to about 0.77% linoleic acid.
These data demonstrate the utility of and effectiveness of recombinant polynucleotides permitting conditional expression of a FAD2 enzyme to alter the fatty acid profile of engineered microorganisms, and in particular in regulating the production of C18:2 fatty acids in microbial cells.
Example 8
Analysis of Regiospecific Profile
LC/MS TAG distribution analyses were carried out using a Shimadzu Nexera ultra high performance liquid chromatography system that included a SIL-30AC autosampler, two LC-30AD pumps, a DGU-20A5 in-line degasser, and a CTO-20A column oven, coupled to a Shimadzu LCMS 8030 triple quadrupole mass spectrometer equipped with an APCI source. Data was acquired using a Q3 scan of m/z 350-1050 at a scan speed of 1428 u/sec in positive ion mode with the CID gas (argon) pressure set to 230 kPa. The APCI, desolvation line, and heat block temperatures were set to 300, 250, and 200° C., respecitvely, the flow rates of the nebulizing and drying gases were 3.0 L/min and 5.0 L/min, respectively, and the interface voltage was 4500 V. Oil samples were dissolved in dichloromethane-methanol (1:1) to a concentration of 5 mg/mL, and 0.8 μL of sample was injected onto Shimadzu Shim-pack XR-ODS III (2.2 μm, 2.0×200 mm) maintained at 30° C. A linear gradient from 30% dichloromethane-2-propanol (1:1)/acetonitrile to 51% dichloromethane-2-propanol (1:1)/acetonitrile over 27 minutes at 0.48 mL/min was used for chromatographic separations.
Example 9
Engineering Microbes for Increased Production of SOS, POP, and POS Triacylglycerides
This example describes the use of recombinant polynucleotides that encode a C18:0-preferring Brassica napus thioesterase (BnOTE) enzyme to engineer a microorganism in which the triacylglyceride distribution of the transformed microorganism has been enriched in SOS, POS, and POP triacylglycerides.
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain A, was initially transformed with the plasmid construct pSZ1358 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. pSZ1358, described in PCT/US2012/023696, hereby incorporated by reference, comprised the coding sequence of the Brassica napus thioesterase (BnOTE) thioesterase (SEQ ID NO: 28), 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4), to express the protein sequence given in SEQ ID NO: 3, under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. The BnOTE protein coding sequence to express the protein sequence given in SEQ ID NO: 29, was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′UTR. The protein coding regions of BnOTE and suc2 were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Primary pSZ1358 transformants of Strain A were selected on agar plates containing sucrose as a sole carbon source, clonally purified, and single engineered line, Strain G was selected for analysis. Strain G was cultivated under heterotrophic lipid production conditions at pH7.0 (to activate expression of BnOTE from the PmAmt03 promoter) as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Oil samples obtained from Strain A and Strain G were analyzed for fatty acid composition using methods described in Examples 1 and 2, and, using the methods described in Example 8, for the regiospecificity of triacylglycerides in the oil. Fatty acid profiles of TAGs isolated from Strain A and G are shown in Table 17. Table 18 presents the regiospecificity profile of POP, POS, and SOS TAGs present in oil samples from Strain A and G.







TABLE 17







Effect of BnOTE expression on the fatty acid composition and the sn-2


profile of TAGs produced from transformed Prototheca moriformis.













Strain G



Area %
Strain A
(pSZ1358)



Fatty
FA
FA



acid
profile
profile















C10:0
n.r.
0.5



C12:0
n.r.
0.5



C14:0
1.0
1.3



C16:0
23.9
25.8



C18:0
3.7
30.4



C18:1
64.3
30.2



C18:2
4.5
8.8



C18:3 α
n.r.
0.4

















TABLE 18







Effect of BnOTE expression on the regiospecific profile of POP, POS,


and SOS TAGs produced from transformed Prototheca moriformis.











Strain A
Strain G




(untransformed)
(pSZ1358)
Cocoa Butter














Area
Normalized
Area 
Normalized
Area
Normalized


TAG
%
Area %
%
Area %
%
Area %
















POP
13.09
76.8
10.6
23.5
17.9
22.1


POS
3.51
20.5
21.0
46.6
39.2
48.4


SOS
0.45
2.6
13.5
29.9
23.9
29.5


total
17.05
100
45.0
100
81.1
100









As shown in Table 17, the fatty acid composition of TAGs isolated from Strain G expressing BnOTE was markedly increased for C18:0 fatty acids (from 3.7% to 30.4%) and decreased in C18:1 fatty acids (from 64.3% to 30.2%) relative to the fatty acid profile of TAGs isolated from untransformed Strain A. The fatty acid composition of TAGs isolated from Strain A was characterized by about 23.9% palmitic acid, 3.7% stearic acid, and 64.3% oleic acid, a ratio for P:S:O of about 6.5:1:17.4. In contrast, the fatty acid composition of TAGs isolated from Strain G was characterized by about 25.8% palmitic acid, 30.4% stearic acid, and 30.2% oleic acid, a ratio for P:O:S of about 1:1.18:1.17.
The impact of expression of a C18:0 preferring thioesterease on the regiospecific profile of POP, POS, and SOS TAGs of oils produced from the transformed microorganism was an increase in all three TAGs as a proportion of the total TAGs present in the oil. As shown in Table 18, the sum of POP+POS+SOS TAGs accounted for 45% of the TAGs produced by Strain G, whereas POP, POS, and SOS TAGs summed to only about 17% of TAGs produced in Strain A. The percentages of POP, POS and SOS of strain G are compared to Cocoa butter in Table 18. As can be seen, ratios of POP, POS and SOS of Strain G are very similar to the ratios observed in cocoa butter.
These data demonstrate the utility and effectiveness of polynucleotides permitting exogenous thioesterase expression to alter the fatty acid and regiospecific profiles of TAGs of engineered microorganisms, in particular to increase the distribution of POP, POS, and SOS TAGs.
Examples 10-33
Engineering of Microorganisms
Examples 10-33 below describe the engineering of various microorganisms in accordance with the present invention. To alter the fatty acid profile of a microorganism, microorganisms can be genetically modified wherein endogenous or exogenous lipid biosynthesis pathway enzymes are expressed, overexpressed, or attenuated. Steps to genetically engineer a microbe to alter its fatty acid profile as to the degree of fatty acid unsaturation and to decrease or increase fatty acid chain length comprise the design and construction of a transformation vector (e.g., a plasmid), transformation of the microbe with one or more vectors, selection of transformed microbes (transformants), growth of the transformed microbe, and analysis of the fatty acid profile of the lipids produced by the engineered microbe.
Transgenes that alter the fatty acid profiles of host organisms can be expressed in numerous eukaryotic microbes. Examples of expression of transgenes in eukaryotic microbes including Chlamydomonas reinhardtii, Chlorella ellipsoidea, Chlorella saccarophila, Chlorella vulgaris, Chlorella kessleri, Chlorella sorokiniana, Haematococcus pluvialis, Gonium pectorale, Volvox carteri, Dunaliella tertiolecta, Dunaliella viridis, Dunaliella salina, Closterium peracerosum-strigosum-littorale complex, Nannochloropsis sp., Thalassiosira pseudonana, Phaeodactylum tricornutum, Navicula saprophila, Cylindrotheca fusiformis, Cyclotella cryptica, Symbiodinium microadriacticum, Amphidinium sp., Chaetoceros sp., Mortierella alpina, and Yarrowia lipolytica can be found in the scientific literature. These expression techniques can be combined with the teachings of the present invention to produce engineered microorganisms with altered fatty acid profiles.
Transgenes that alter the fatty acid profiles of host organisms or alter the regiospecific distribution of glycerolipids produced by host organisms can also be expressed in numerous prokaryotic microbes. Examples of expression of transgenes in oleaginous microbes including Rhodococcus opacus can be found in the literature. These expression techniques can be combined with the teachings of the present invention to produce engineered microorganisms with altered fatty acid profiles.







TABLES 19A-D





Codon preference listing.























Amino

Chlorella
Chlorella
Chlorella
Chlorella
Dunaliella
Volvox
Haematococcus


Acid
Codon
sorokiniana
vulgaris
ellipsoidea
kessleri
tertiolecta
carteri
pluvialis





Ala
GCG
0.20
0.25
0.15
0.14
0.09
0.25
0.21


Ala
GCA
0.05
0.24
0.32
0.10
0.17
0.13
0.27


Ala
GCT
0.12
0.16
0.26
0.18
0.31
0.26
0.17


Ala
GCC
0.63
0.35
0.27
0.58
0.43
0.36
0.35


Arg
AGG
0.03
0.09
0.10
0.09
0.26
0.08
0.14


Arg
AGA
0.04
0.05
0.14
0.01
0.09
0.03
0.05


Arg
CGG
0.06
0.19
0.09
0.06
0.06
0.17
0.15


Arg
CGA
0.00
0.10
0.08
0.00
0.08
0.08
0.10


Arg
CGT
0.06
0.09
0.37
0.14
0.12
0.22
0.13


Arg
CGC
0.81
0.48
0.22
0.71
0.40
0.43
0.42


Asn
AAT
0.04
0.16
0.43
0.06
0.27
0.23
0.21


Asn
AAC
0.96
0.84
0.57
0.94
0.73
0.77
0.79


Asp
GAT
0.13
0.25
0.47
0.12
0.40
0.35
0.27


Asp
GAC
0.87
0.75
0.53
0.88
0.60
0.65
0.73


Cys
TGT
0.06
0.13
0.43
0.09
0.20
0.17
0.27


Cys
TGC
0.94
0.87
0.57
0.91
0.80
0.83
0.64


End
TGA
0.00
0.72
0.14
0.14
0.36
0.24
0.70


End
TAG
0.33
0.11
0.29
0.00
0.00
0.18
0.22


End
TAA
0.67
0.17
4.00
0.86
0.64
0.59
0.09


Gln
CAG
0.42
0.40
0.15
0.40
0.27
0.29
0.33


Gln
CAA
0.04
0.04
0.21
0.40
0.27
0.07
0.10


Glu
GAG
0.53
0.50
0.33
0.40
0.27
0.53
0.49


Glu
GAA
0.02
0.06
0.31
0.40
0.27
0.11
0.07


Gly
GGG
0.04
0.16
0.19
0.08
0.10
0.12
0.22


Gly
GGA
0.02
0.11
0.13
0.07
0.13
0.12
0.11


Gly
GGT
0.03
0.12
0.39
0.24
0.25
0.23
0.15


Gly
GGC
0.91
0.61
0.29
0.96
0.51
0.53
0.52


His
CAT
0.14
0.16
0.30
0.08
0.25
0.35
0.27


His
CAC
0.86
0.84
0.70
0.93
0.75
0.65
0.73


Ile
ATA
0.00
0.04
0.07
0.01
0.04
0.08
0.09


Ile
ATT
0.15
0.30
0.63
0.29
0.31
0.35
0.29


Ile
ATC
0.85
0.66
0.65
0.69
0.65
0.57
0.62


Leu
TTG
0.03
0.07
0.03
0.05
0.14
0.14
0.16


Leu
TTA
0.00
0.01
0.32
0.00
0.02
0.03
0.02


Leu
CTG
0.72
0.61
0.34
0.61
0.60
0.45
0.53


Leu
CTA
0.01
0.03
0.03
0.04
0.04
0.07
0.07


Leu
CTT
0.04
0.08
0.16
0.06
0.06
0.14
0.09


Leu
CTC
0.20
0.20
0.12
0.24
0.14
0.17
0.13


Lys
AAG
0.98
0.94
0.54
0.98
0.90
0.90
0.84


Lys
AAA
0.02
0.06
0.46
0.02
0.10
0.10
0.16


Met
ATG
1.00
1.00
1.00
1.00
1.00
1.00
1.00


Phe
TTT
0.28
0.32
0.42
0.31
0.24
0.27
0.35


Phe
TTC
0.72
0.68
0.58
0.69
0.76
0.73
0.65


Pro
CCG
0.18
0.31
0.09
0.07
0.04
0.34
0.15


Pro
CCA
0.06
0.17
0.36
0.07
0.04
0.20
0.24


Pro
CCT
0.10
0.14
0.25
0.17
0.04
0.19
0.29


Pro
CCC
0.66
0.38
0.29
0.69
0.04
0.27
0.32


Ser
AGT
0.03
0.04
0.14
0.02
0.08
0.08
0.07


Ser
AGC
0.27
0.38
0.18
0.18
0.31
0.27
0.31


Ser
TCG
0.12
0.14
0.08
0.10
0.02
0.19
0.10


Ser
TCA
0.03
0.08
0.14
0.08
0.09
0.09
0.14


Ser
TCT
0.09
0.11
0.26
0.18
0.19
0.14
0.13


Ser
TCC
0.47
0.24
0.20
0.44
0.30
0.24
0.24


Thr
ACG
0.11
0.20
0.13
0.05
0.12
0.27
0.19


Thr
ACA
0.01
0.20
0.32
0.07
0.20
0.12
0.23


Thr
ACT
0.12
0.13
0.29
0.12
0.24
0.20
0.18


Thr
ACC
0.76
0.47
0.26
0.76
0.44
0.41
0.40


Trp
TGG
1.00
1.00
1.00
1.00
1.00
1.00
1.00


Tyr
TAT
0.07
0.15
0.43
0.27
0.28
0.24
0.19


Tyr
TAC
0.93
0.85
0.57
0.73
0.72
0.76
0.81


Val
GTG
0.71
0.54
0.37
0.60
0.54
0.46
0.62


Val
GTA
0.00
0.05
0.25
0.03
0.09
0.07
0.09


Val
GTT
0.11
0.14
0.24
0.09
0.14
0.17
0.09


Val
GTC
0.18
0.27
0.14
0.28
0.23
0.30
0.21



















Closterium









peracerosum-









strigosum-







Amino

littorale
Dunaliella
Dunaliella
Gonium
Phaeodactylum
Chaetoceros


Acid
Codon
complex
viridis
salina
pectorale
tricornutum
compressum





Ala
GCG
0.48
0.13
0.15
0.43
0.15
0.08


Ala
GCA
0.10
0.27
0.20
0.09
0.10
0.37


Ala
GCT
0.15
0.25
0.27
0.08
0.23
0.36


Ala
GCC
0.26
0.35
0.39
0.41
0.52
0.18


Arg
AGG
0.04
0.25
0.22
0.13
0.02
0.14


Arg
AGA
0.00
0.06
0.05
0.00
0.04
0.29


Arg
CGG
0.18
0.08
0.12
0.40
0.10
0.00


Arg
CGA
0.00
0.06
0.06
0.05
0.12
0.19


Arg
CGT
0.13
0.15
0.13
0.08
0.41
0.38


Arg
CGC
0.64
0.39
0.43
0.35
0.31
0.00


Asn
AAT
0.04
0.17
0.23
0.07
0.30
0.58


Asn
AAC
0.96
0.83
0.77
0.93
0.65
0.42


Asp
GAT
0.30
0.38
0.40
0.11
0.41
0.53


Asp
GAC
0.70
0.62
0.60
0.89
0.59
0.47


Cys
TGT
0.06
0.24
0.17
0.20
0.39
0.44


Cys
TGC
0.94
0.76
0.83
0.90
0.61
0.56


End
TGA
0.75
0.31
0.37
0.50
0.06
0.50


End
TAG
0.00
0.15
0.14
0.00
0.13
0.00


End
TAA
0.25
0.54
0.49
0.50
0.81
0.50


Gln
CAG
0.53
0.36
0.32
0.31
0.23
0.16


Gln
CAA
0.09
0.12
0.08
0.07
0.14
0.19


Glu
GAG
0.31
0.44
0.51
0.56
0.21
0.28


Glu
GAA
0.06
0.09
0.09
0.07
0.42
0.37


Gly
GGG
0.31
0.14
0.10
0.18
0.08
0.12


Gly
GGA
0.06
0.11
0.12
0.09
0.34
0.33


Gly
GGT
0.09
0.22
0.22
0.07
0.30
0.39


Gly
GGC
0.53
0.54
0.56
0.65
0.28
0.16


His
CAT
0.33
0.25
0.25
0.43
0.28
0.84


His
CAC
0.67
0.75
0.75
0.57
0.72
0.16


Ile
ATA
0.03
0.03
0.03
0.07
0.03
0.12


Ile
ATT
0.23
0.25
0.31
0.33
0.51
0.65


Ile
ATC
0.74
0.72
0.66
0.59
0.46
0.23


Leu
TTG
0.04
0.11
0.12
0.04
0.26
0.11


Leu
TTA
0.00
0.01
0.01
0.00
0.02
0.14


Leu
CTG
0.31
0.60
0.61
0.64
0.15
0.05


Leu
CTA
0.01
0.05
0.04
0.01
0.05
0.08


Leu
CTT
0.04
0.07
0.08
0.05
0.18
0.51


Leu
CTC
0.60
0.16
0.14
0.26
0.34
0.11


Lys
AAG
0.86
0.87
0.89
0.93
0.75
0.52


Lys
AAA
0.14
0.13
0.11
0.07
0.25
0.48


Met
ATG
1.00
1.00
1.00
1.00
1.00
1.00


Phe
TTT
0.09
0.25
0.29
0.10
0.44
0.65


Phe
TTC
0.91
0.75
0.71
0.90
0.56
0.35


Pro
CCG
0.28
0.10
0.08
0.53
0.29
0.05


Pro
CCA
0.15
0.10
0.17
0.09
0.12
0.45


Pro
CCT
0.12
0.10
0.30
0.04
0.20
0.33


Pro
CCC
0.44
0.10
0.45
0.34
0.40
0.17


Ser
AGT
0.04
0.09
0.06
0.02
0.12
0.14


Ser
AGC
0.05
0.31
0.32
0.20
0.12
0.07


Ser
TCG
0.22
0.04
0.06
0.42
0.19
0.08


Ser
TCA
0.16
0.08
0.10
0.09
0.06
0.31


Ser
TCT
0.05
0.17
0.15
0.07
0.15
0.23


Ser
TCC
0.47
0.31
0.30
0.20
0.35
0.18


Thr
ACG
0.30
0.16
0.13
0.42
0.23
0.10


Thr
ACA
0.06
0.21
0.18
0.03
0.13
0.38


Thr
ACT
0.22
0.18
0.23
0.08
0.19
0.27


Thr
ACC
0.42
0.46
0.46
0.47
0.45
0.25


Trp
TGG
1.00
1.00
1.00
1.00
1.00
1.00


Tyr
TAT
0.07
0.16
0.21
0.12
0.18
0.67


Tyr
TAC
0.93
0.84
0.79
0.88
0.82
0.33


Val
GTG
0.50
0.64
0.62
0.57
0.22
0.30


Val
GTA
0.02
0.03
0.05
0.04
0.09
0.27


Val
GTT
0.06
0.11
0.11
0.04
0.22
0.10


Val
GTC
0.42
0.22
0.23
0.35
0.47
0.33























Symbiodinium
Nanno-






Amino

Cylindrotheca
Amphidinium
micro-
chloropsis
Cyclotella
Navicula
Thalassiosira
C.


Acid
Codon
fusiformis
carterae
adriacticum
sp
cryptica
pelliculosa
pseudonana
reinhardtii





Ala
GCG
0.07
0.17
0.22
0.24
0.11
0.00
0.11
0.35


Ala
GCA
0.14
0.33
0.26
0.10
0.16
0.13
0.25
0.08


Ala
GCT
0.35
0.29
0.20
0.17
0.45
0.44
0.33
0.13


Ala
GCC
0.43
0.20
0.32
0.48
0.27
0.44
0.30
0.43


Arg
AGG
0.09
0.15
0.27
0.00
0.09
0.05
0.18
0.05


Arg
AGA
0.14
0.03
0.27
0.00
0.05
0.10
0.17
0.01


Arg
CGG
0.06
0.08
0.09
0.00
0.04
0.05
0.06
0.20


Arg
CGA
0.16
0.18
0.09
0.29
0.08
0.35
0.11
0.04


Arg
CGT
0.34
0.18
0.09
0.14
0.47
0.20
0.34
0.09


Arg
CGC
0.22
0.40
0.18
0.57
0.28
0.25
0.15
0.62


Asn
AAT
0.42
0.37
0.21
0.00
0.25
0.47
0.43
0.09


Asn
AAC
0.58
0.63
0.79
1.00
0.75
0.53
0.57
0.91


Asp
GAT
0.54
0.54
0.50
0.20
0.52
0.20
0.56
0.14


Asp
GAC
0.46
0.46
0.50
0.80
0.48
0.80
0.44
0.86


Cys
TGT
0.44
0.75
0.50
0.00
0.29
0.10
0.54
0.10


Cys
TGC
0.56
0.25
0.50
1.00
0.71
0.90
0.46
0.90


End
TGA
0.13
0.50
1.00
0.00
0.10
0.00
0.31
0.27


End
TAG
0.10
0.00
0.00
0.00
0.00
0.00
0.38
0.22


End
TAA
0.77
0.50
0.00
1.00
0.90
1.00
0.31
0.52


Gln
CAG
0.12
0.33
0.28
0.41
0.19
0.21
0.16
0.38


Gln
CAA
0.25
0.15
0.17
0.00
0.17
0.28
0.19
0.04


Glu
GAG
0.23
0.41
0.50
0.59
0.38
0.17
0.40
0.55


Glu
GAA
0.39
0.10
0.06
0.00
0.26
0.34
0.26
0.03


Gly
GGG
0.06
0.19
0.32
0.10
0.10
0.03
0.12
0.11


Gly
GGA
0.47
0.10
0.12
0.05
0.45
0.28
0.51
0.06


Gly
GGT
0.35
0.34
0.16
0.25
0.22
0.13
0.23
0.11


Gly
GGC
0.12
0.37
0.40
0.60
0.24
0.56
0.14
0.72


His
CAT
0.39
0.12
0.40
0.00
0.42
1.00
0.50
0.11


His
CAC
0.61
0.88
0.60
1.00
0.58
0.00
0.50
0.89


Ile
ATA
0.06
0.05
0.00
0.00
0.04
0.00
0.08
0.03


Ile
ATT
0.42
0.53
0.38
0.14
0.53
0.73
0.38
0.22


Ile
ATC
0.52
0.42
0.63
0.86
0.42
0.27
0.54
0.75


Leu
TTG
0.26
0.35
0.39
0.22
0.20
0.16
0.29
0.04


Leu
TTA
0.09
0.01
0.00
0.00
0.03
0.00
0.05
0.01


Leu
CTG
0.09
0.22
0.39
0.09
0.06
0.12
0.08
0.73


Leu
CTA
0.05
0.00
0.04
0.00
0.03
0.04
0.06
0.03


Leu
CTT
0.37
0.31
0.13
0.04
0.39
0.36
0.20
0.05


Leu
CTC
0.13
0.12
0.04
0.65
0.29
0.32
0.32
0.15


Lys
AAG
0.60
0.93
0.85
1.00
0.70
0.83
0.76
0.95


Lys
AAA
0.40
0.07
0.15
0.00
0.30
0.17
0.24
0.05


Met
ATG
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00


Phe
TTT
0.37
0.21
0.25
0.20
0.31
0.78
0.38
0.16


Phe
TTC
0.63
0.79
0.75
0.80
0.69
0.22
0.62
0.84


Pro
CCG
0.11
0.14
0.18
0.08
0.10
0.21
0.16
0.33


Pro
CCA
0.33
0.42
0.09
0.08
0.16
0.29
0.31
0.08


Pro
CCT
0.32
0.22
0.41
0.25
0.35
0.21
0.31
0.13


Pro
CCC
0.24
0.22
0.32
0.58
0.39
0.29
0.23
0.47


Ser
AGT
0.12
0.13
0.09
0.00
0.09
0.13
0.18
0.04


Ser
AGC
0.09
0.24
0.14
0.13
0.08
0.28
0.11
0.35


Ser
TCG
0.13
0.03
0.05
0.00
0.15
0.25
0.17
0.25


Ser
TCA
0.12
0.25
0.05
0.00
0.12
0.08
0.12
0.05


Ser
TCT
0.30
0.16
0.23
0.13
0.39
0.25
0.23
0.07


Ser
TCC
0.24
0.19
0.45
0.75
0.18
0.03
0.19
0.25


Thr
ACG
0.09
0.14
0.10
0.28
0.10
0.18
0.21
0.30


Thr
ACA
0.15
0.28
0.10
0.00
0.15
0.09
0.19
0.08


Thr
ACT
0.39
0.12
0.10
0.17
0.33
0.41
0.28
0.10


Thr
ACC
0.37
0.47
0.70
0.56
0.43
0.32
0.32
0.52


Trp
TGG
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00


Tyr
TAT
0.38
0.32
0.20
0.00
0.38
0.20
0.39
0.10


Tyr
TAC
0.62
0.68
0.80
1.00
0.62
0.80
0.61
0.90


Val
GTG
0.11
0.65
0.67
0.31
0.16
0.18
0.29
0.67


Val
GTA
0.06
0.05
0.00
0.00
0.09
0.09
0.16
0.03


Val
GTT
0.38
0.08
0.11
0.15
0.42
0.09
0.28
0.07


Val
GTC
0.46
0.21
0.22
0.54
0.33
0.64
0.27
0.22














Amino

Yarrowia
Mortierella
Rhodococcus


Acid
Codon
lipolytica
alpina
opacus





Ala
GCG
0.08
0.14
0.35


Ala
GCA
0.11
0.12
0.14


Ala
GCT
0.35
0.29
0.09


Ala
GCC
0.46
0.45
0.43


Arg
AGG
0.05
0.05
0.05


Arg
AGA
0.13
0.06
0.02


Arg
CGG
0.12
0.06
0.26


Arg
CGA
0.52
0.09
0.12


Arg
CGT
0.11
0.32
0.11


Arg
CGC
0.07
0.42
0.44


Asn
AAT
0.17
0.15
0.21


Asn
AAC
0.83
0.85
0.79


Asp
GAT
0.35
0.42
0.24


Asp
GAC
0.65
0.58
0.76


Cys
TGT
0.46
0.13
0.26


Cys
TGC
0.54
0.87
0.74


End
TGA
0.16
0.05
0.72


End
TAG
0.38
0.25
0.17


End
TAA
0.46
0.70
0.11


Gln
CAG
0.33
0.36
0.28


Gln
CAA
0.08
0.06
0.06


Glu
GAG
0.44
0.49
0.45


Glu
GAA
0.14
0.09
0.22


Gly
GGG
0.05
0.03
0.18


Gly
GGA
0.28
0.29
0.15


Gly
GGT
0.32
0.32
0.20


Gly
GGC
0.34
0.36
0.48


His
CAT
0.34
0.27
0.20


His
CAC
0.66
0.73
0.80


Ile
ATA
0.03
0.01
0.05


Ile
ATT
0.44
0.33
0.14


Ile
ATC
0.53
0.66
0.81


Leu
TTG
0.09
0.27
0.09


Leu
TTA
0.02
0.00
0.01


Leu
CTG
0.37
0.26
0.41


Leu
CTA
0.05
0.02
0.03


Leu
CTT
0.18
0.12
0.06


Leu
CTC
0.29
0.32
0.40


Lys
AAG
0.84
0.91
0.80


Lys
AAA
0.16
0.09
0.20


Met
ATG
1.00
1.00
1.00


Phe
TTT
0.38
0.39
0.09


Phe
TTC
0.62
0.61
0.91


Pro
CCG
0.10
0.07
0.52


Pro
CCA
0.10
0.08
0.09


Pro
CCT
0.32
0.36
0.07


Pro
CCC
0.47
0.49
0.32


Ser
AGT
0.07
0.05
0.08


Ser
AGC
0.11
0.14
0.23


Ser
TCG
0.16
0.32
0.33


Ser
TCA
0.08
0.08
0.07


Ser
TCT
0.28
0.12
0.05


Ser
TCC
0.30
0.29
0.24


Thr
ACG
0.11
0.17
0.28


Thr
ACA
0.14
0.10
0.11


Thr
ACT
0.26
0.23
0.07


Thr
ACC
0.49
0.49
0.53


Trp
TGG
1.00
1.00
1.00


Tyr
TAT
0.18
0.20
0.18


Tyr
TAC
0.82
0.80
0.82


Val
GTG
0.33
0.22
0.37


Val
GTA
0.05
0.02
0.05


Val
GTT
0.26
0.27
0.10


Val
GTC
0.36
0.49
0.49
















TABLE 20





Lipid biosynthesis pathway proteins.















3-Ketoacyl ACP synthase


Cuphea hookeriana 3-ketoacyl-ACP synthase (GenBank Acc. No. AAC68861.1), Cuphea


wrightii beta-ketoacyl-ACP synthase II (GenBank Acc. No. AAB37271.1), Cuphea


lanceolata beta-ketoacyl-ACP synthase IV (GenBank Acc. No. CAC59946.1), Cuphea


wrightii beta-ketoacyl-ACP synthase II (GenBank Acc. No. AAB37270.1), Ricinus communis


ketoacyl-ACP synthase (GenBank Acc. No. XP_002516228), Gossypium hirsutum ketoacyl-


ACP synthase (GenBank Acc. No. ADK23940.1), Glycine max plastid 3-keto-acyl-ACP


synthase II-A (GenBank Acc No. AAW88763.1), Elaeis guineensis beta-ketoacyl-ACP


synthase II (GenBank Acc. No. AAF26738.2), Helianthus annuus plastid 3-keto-acyl-ACP


synthase I (GenkBank Acc. No. ABM53471.1), Glycine max3-keto-acyl-ACP synthase I


(GenBank Acc. No. NP_001238610.1), Helianthus annuus plastid 3-keto-acyl-ACP synthase


II (GenBank Acc ABI18155.1), Brassica napus beta-ketoacyl-ACP synthetase 2 (GenBank


Acc. No. AAF61739.1), Perilla frutescens beta-ketoacyl-ACP synthase II (GenBank Acc. No.


AAC04692.1), Helianthus annus beta-ketoacyl-ACP synthase II (GenBank Accession No.


ABI18155), Ricinus communis beta-ketoacyl-ACP synthase II (GenBank Accession No.


AAA33872), Haematococcus pluvialis beta-ketoacyl acyl carrier protein synthase (GenBank


Accession No. HM560033.1), Jatropha curcasbeta ketoacyl-ACP synthase I (GenBank


Accession No. ABJ90468.1), Populus trichocarpa beta-ketoacyl-ACP synthase I (GenBank


Accession No. XP_002303661.1), Coriandrum sativum beta-ketoacyl-ACP synthetase I


(GenBank Accession No. AAK58535.1), Arabidopsis thaliana 3-oxoacyl-[acyl-carrier-


protein] synthase I (GenBank Accession No. NP_001190479.1), Vitis vinifera 3-oxoacyl-


[acyl-carrier-protein] synthase I (GenBank Accession No. XP_002272874.2)


Fatty acyl-ACP Thioesterases


Umbellularia californica fatty acyl-ACP thioesterase (GenBank Acc. No. AAC49001),


Cinnamomum camphora fatty acyl-ACP thioesterase (GenBank Acc. No. Q39473),


Umbellularia californica fatty acyl-ACP thioesterase (GenBank Acc. No. Q41635), Myristica


fragrans fatty acyl-ACP thioesterase (GenBank Acc. No. AAB71729), Myristica fragrans


fatty acyl-ACP thioesterase (GenBank Acc. No. AAB71730), Elaeis guineensis fatty acyl-


ACP thioesterase (GenBank Acc. No. ABD83939), Elaeis guineensis fatty acyl-ACP


thioesterase (GenBank Acc. No. AAD42220), Populus tomentosa fatty acyl-ACP thioesterase


(GenBank Acc. No. ABC47311), Arabidopsis thaliana fatty acyl-ACP thioesterase (GenBank


Acc. No. NP_172327), Arabidopsis thaliana fatty acyl-ACP thioesterase (GenBank Acc. No.


CAA85387), Arabidopsis thaliana fatty acyl-ACP thioesterase (GenBank Acc. No.


CAA85388), Gossypium hirsutum fatty acyl-ACP thioesterase (GenBank Acc. No. Q9SQI3),


Cuphea lanceolata fatty acyl-ACP thioesterase (GenBank Acc. No. CAA54060), Cuphea


hookeriana fatty acyl-ACP thioesterase (GenBank Acc. No. AAC72882), Cuphea calophylla


subsp. mesostemon fatty acyl-ACP thioesterase (GenBank Acc. No. ABB71581), Cuphea


lanceolata fatty acyl-ACP thioesterase (GenBank Acc. No. CAC19933), Elaeis guineensis


fatty acyl-ACP thioesterase (GenBank Acc. No. AAL15645), Cuphea hookeriana fatty acyl-


ACP thioesterase (GenBank Acc. No. Q39513), Gossypium hirsutum fatty acyl-ACP


thioesterase (GenBank Acc. No. AAD01982), Vitis vinifera fatty acyl-ACP thioesterase


(GenBank Acc. No. CAN81819), Garcinia mangostana fatty acyl-ACP thioesterase


(GenBank Acc. No. AAB51525), Brassica juncea fatty acyl-ACP thioesterase (GenBank


Acc. No. ABI18986), Madhuca longifolia fatty acyl-ACP thioesterase (GenBank Acc. No.


AAX51637), Brassica napus fatty acyl-ACP thioesterase (GenBank Acc. No. ABH11710), Brassica


napus fatty acyl-ACP thioesterase (GenBank Acc. No. CAA52070.1), Oryza sativa


(indica cultivar-group) fatty acyl-ACP thioesterase (GenBank Acc. No. EAY86877), Oryza


sativa (japonica cultivar-group) fatty acyl-ACP thioesterase (GenBank Acc. No.


NP_001068400), Oryza sativa (indica cultivar-group) fatty acyl-ACP thioesterase (GenBank


Acc. No. EAY99617), Cuphea hookeriana fatty acyl-ACP thioesterase (GenBank Acc. No.


AAC49269), Ulmus Americana fatty acyl-ACP thioesterase (GenBank Acc. No. AAB71731),


Cuphea lanceolata fatty acyl-ACP thioesterase (GenBank Acc. No. CAB60830), Cuphea


palustris fatty acyl-ACP thioesterase (GenBank Acc. No. AAC49180), Iris germanica fatty


acyl-ACP thioesterase (GenBank Acc. No. AAG43858, Iris germanica fatty acyl-ACP


thioesterase (GenBank Acc. No. AAG43858.1), Cuphea palustris fatty acyl-ACP thioesterase


(GenBank Acc. No. AAC49179), Myristica fragrans fatty acyl-ACP thioesterase (GenBank


Acc. No. AAB71729), Myristica fragrans fatty acyl-ACP thioesterase (GenBank Acc. No.


AAB717291.1), Cuphea hookeriana fatty acyl-ACP thioesterase GenBank Acc. No.


U39834), Umbelluaria californica fatty acyl-ACP thioesterase (GenBank Acc. No. M94159),


Cinnamomum camphora fatty acyl-ACP thioesterase (GenBank Acc. No. U31813), Ricinus


communis fatty acyl-ACP thioesterase (GenBank Acc. No. ABS30422.1), Helianthus annuus


acyl-ACP thioesterase (GenBank Accession No. AAL79361.1), Jatropha curcas acyl-ACP


thioesterase (GenBank Accession No. ABX82799.3), Zea mays oleoyl-acyl carrier protein


thioesterase, (GenBank Accession No. ACG40089.1), Haematococcus pluvialis fatty acyl-


ACP thioesterase (GenBank Accession No. HM560034.1)


Desaturase Enzymes


Linum usitatissimum fatty acid desaturase 3C, (GenBank Acc. No. ADV92272.1), Ricinus


communis omega-3 fatty acid desaturase, endoplasmic reticulum, putative, (GenBank Acc.


No. EEF36775.1), Vernicia fordii omega-3 fatty acid desaturase, (GenBank Acc. No.


AAF12821), Glycine max chloroplast omega 3 fatty acid desaturase isoform 2, (GenBank


Acc. No. ACF19424.1), Prototheca moriformis FAD-D omega 3 desaturase (SEQ ID NO:


35), Prototheca moriformis linoleate desaturase (SEQ ID NO: 36), Carthamus tinctorius


delta 12 desaturase, (GenBank Accession No. ADM48790.1), Gossypium hirsutum omega-6


desaturase, (GenBank Accession No. CAA71199.1), Glycine max microsomal desaturase


(GenBank Accession No. BAD89862.1), Zea mays fatty acid desaturase (GenBank Accession


No. ABF50053.1), Brassica napa linoleic acid desaturase (GenBank Accession No.


AAA32994.1), Camelina sativa omega-3 desaturase (SEQ ID NO: 37), Prototheca


moriformis delta 12 desaturase allele 2 (SEQ ID NO: 38, Camelina sativa omega-3 FAD7-1


(SEQ ID NO: 39), Helianthus annuus stearoyl-ACP desaturase, (GenBank Accession No.


AAB65145.1), Ricinus communis stearoyl-ACP desaturase, (GenBank Accession No.


AACG59946.1), Brassica juncea plastidic delta-9-stearoyl-ACP desaturase (GenBank


Accession No. AAD40245.1), Glycine max stearoyl-ACP desaturase (GenBank Accession


No. ACJ39209.1), Olea europaea stearoyl-ACP desaturase (GenBank Accession No.


AAB67840.1), Vernicia fordii stearoyl-acyl-carrier protein desaturase, (GenBank Accession


No. ADC32803.1), Descurainia sophia delta-12 fatty acid desaturase (GenBank Accession


No. ABS86964.2), Euphorbia lagascae delta12-oleic acid desaturase (GenBank Acc. No.


AAS57577.1), Chlorella vulgaris delta 12 fatty acid desaturease (GenBank Accession No.


ACF98528), Chlorella vulgaris omega-3 fatty acid desaturease (GenBank Accession No.


BAB78717), Haematococcus pluvialis omega-3 fatty acid desaturase (GenBank Accession


No. HM560035.1), Haematococcus pluvialis stearoyl-ACP-desaturase GenBank Accession


No. EF586860.1, Haematococcus pluvialis stearoyl-ACP-desaturase GenBank Accession No.


EF523479.1


Oleate 12-hydroxylase Enzymes


Ricinus communis oleate 12-hydroxylase (GenBank Acc. No. AAC49010.1),


Physaria lindheimeri oleate 12-hydroxylase (GenBank Acc. No. ABQ01458.1),


Physaria lindheimeri mutant bifunctional oleate 12-hydroxylase:desaturase (GenBank Acc.


No. ACF17571.1), Physaria lindheimeri bifunctional oleate 12-hydroxylase:desaturase


(GenBank Accession No. ACQ42234.1), Physaria lindheimeri bifunctional oleate 12-


hydroxylase:desaturase (GenBank Acc. No. AAC32755.1), Arabidopsis lyrata subsp. Lyrata


(GenBank Acc. No. XP_002884883.1)


Glycerol-3-phosphate Enzymes


Arabidopsis thaliana glycerol-3-phosphate acyltransferase BAA00575, Chlamydomonas


reinhardtii glycerol-3-phosphate acyltransferase (GenBank Acc. No. EDP02129),


Chlamydomonas reinhardtii glycerol-3-phosphate acyltransferase (GenBank Acc. No.


Q886Q7), Cucurbita moschata acyl-(acyl-carrier-protein):glycerol-3-phosphate


acyltransferase (GenBank Acc. No. BAB39688), Elaeis guineensis glycerol-3-phosphate


acyltransferase, ((GenBank Acc. No. AAF64066), Garcina mangostana glycerol-3-phosphate


acyltransferase (GenBank Acc. No. ABS86942), Gossypium hirsutum glycerol-3-phosphate


acyltransferase (GenBank Acc. No. ADK23938), Jatropha curcas glycerol-3-phosphate


acyltransferase (GenBank Acc. No. ADV77219), Jatropha curcas plastid glycerol-3-


phosphate acyltransferase (GenBank Acc. No. ACR61638), Ricinus communis plastidial


glycerol-phosphate acyltransferase (GenBank Acc. No. EEF43526), Vica faba glycerol-3-


phosphate acyltransferase (GenBank Accession No. AAD05164), Zea mays glycerol-3-


phosphate acyltransferase (GenBank Acc. No. ACG45812)


Lysophosphatidic acid acyltransferase Enzymes


Arabidopsis thaliana 1-acyl-sn-glycerol-3-phosphate acyltransferase (GenBank Accession


No. AEE85783), Brassica juncea 1-acyl-sn-glycerol-3-phosphate acyltransferase (GenBank


Accession No. ABQ42862), Brassica juncea 1-acyl-sn-glycerol-3-phosphate acyltransferase


(GenBank Accession No. ABM92334), Brassica napus 1-acyl-sn-glycerol-3-phosphate


acyltransferase (GenBank Accession No. CAB09138), Chlamydomonas reinhardtii


lysophosphatidic acid acyltransferase (GenBank Accession No. EDP02300), Cocos nucifera


lysophosphatidic acid acyltransferase (GenBank Acc. No. AAC49119), Limnanthes alba


lysophosphatidic acid acyltransferase (GenBank Accession No. EDP02300), Limnanthes


douglasii 1-acyl-sn-glycerol-3-phosphate acyltransferase (putative) (GenBank Accession No.


CAA88620), Limnanthes douglasii acyl-CoA:sn-1-acylglycerol-3-phosphate acyltransferase


(GenBank Accession No. ABD62751), Limnanthes douglasii 1-acylglycerol-3-phosphate O-


acyltransferase (GenBank Accession No. CAA58239), Ricinus communis 1-acyl-sn-glycerol-


3-phosphate acyltransferase (GenBank Accession No. EEF39377)


Diacylglycerol acyltransferase Enzymes


Arabidopsis thaliana diacylglycerol acyltransferase (GenBank Acc. No. CAB45373),


Brassica juncea diacylglycerol acyltransferase (GenBank Acc. No. AAY40784), Elaeis


guineensis


putative diacylglycerol acyltransferase (GenBank Acc. No. AEQ94187), Elaeis guineensis


putative diacylglycerol acyltransferase (GenBank Acc. No. AEQ94186), Glycine max acyl


CoA:diacylglycerol acyltransferase (GenBank Acc. No. AAT73629), Helianthus annus


diacylglycerol acyltransferase (GenBank Acc. No. ABX61081), Olea europaea acyl-


CoA:diacylglycerol acyltransferase 1 (GenBank Acc. No. AAS01606), Ricinus communis


diacylglycerol acyltransferase (GenBank Acc. No. AAR11479)


Phospholipid diacylglycerol acyltransferase Enzymes


Arabidopsis thaliana phospholipid:diacylglycerol acyltransferase (GenBank Acc. No.


AED91921), Elaeis guineensis putative phospholipid:diacylglycerol acyltransferase


(GenBank Acc. No. AEQ94116), Glycine max phospholipid:diacylglycerol acyltransferase


1-like (GenBank Acc. No. XP_003541296), Jatropha curcas phospholipid:diacylglycerol


acyltransferase (GenBank Acc. No. AEZ56255), Ricinus communis


phospholipid:diacylglycerol acyltransferase (GenBank Acc. No. ADK92410), Ricinus


communis phospholipid:diacylglycerol acyltransferase (GenBank Acc. No. AEW99982)









Example 10
Engineering Chlorella sorokiniana 
Expression of recombinant genes in accordance with the present invention in Chlorella sorokiniana can be accomplished by modifying the methods and vectors taught by Dawson et al. as discussed herein. Briefly, Dawson et al., Current Microbiology Vol. 35 (1997) pp. 356-362, reported the stable nuclear transformation of Chlorella sorokiniana with plasmid DNA. Using the transformation method of microprojectile bombardment, Dawson introduced the plasmid pSV72-NR9, encoding the full Chlorella vulgaris nitrate reductase gene (NR, GenBank Accession No. U39931), into mutant Chlorella sorokiniana (NR-mutants). The NR-mutants are incapable of growth without the use of nitrate as a source of nitrogen. Nitrate reductase catalyzes the conversion of nitrate to nitrite. Prior to transformation, Chlorella sorokiniana NR-mutants were unable to grow beyond the microcolony stage on culture medium comprising nitrate (NO3−) as the sole nitrogen source. The expression of the Chlorella vulgaris NR gene product in NR-mutant Chlorella sorokiniana was used as a selectable marker to rescue the nitrate metabolism deficiency. Upon transformation with the pSV72-NR9 plasmid, NR-mutant Chlorella sorokiniana stably expressing the Chlorella vulgaris NR gene product were obtained that were able to grow beyond the microcolony stage on agar plates comprising nitrate as the sole carbon source. Evaluation of the DNA of the stable transformants was performed by Southern analysis and evaluation of the RNA of the stable transformants was performed by RNase protection. Selection and maintenance of the transformed Chlorella sorokiniana (NR mutant) was performed on agar plates (pH 7.4) comprising 0.2 g/L MgSO4, 0.67 g/L KH2PO4, 3.5 g/L K2HPO4, 1.0 g/L Na3C6HSO7.H2O and 16.0 g/L agar, an appropriate nitrogen source (e.g., NO3), micronutrients, and a carbon source. Dawson also reported the propagation of Chlorella sorokiniana and Chlorella sorokiniana NR mutants in liquid culture medium. Dawson reported that the plasmid pSV72-NR9 and the promoter and 3′ UTR/terminator of the Chlorella vulgaris nitrate reductase gene were suitable to enable heterologous gene expression in Chlorella sorokiniana NR-mutants. Dawson also reported that expression of the Chlorella vulgaris nitrate reductase gene product was suitable for use as a selectable marker in Chlorella sorokiniana NR-mutants.
In an embodiment of the present invention, vector pSV72-NR9, comprising nucleotide sequence encoding the Chlorella vulgaris nitrate reductase (CvNR) gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Chlorella sorokiniana to reflect the codon bias inherent in nuclear genes of Chlorella sorokiniana in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the CvNR promoter upstream of the protein-coding sequence and operably linked to the CvNR3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chlorella sorokiniana genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Chlorella sorokiniana with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the CvNR gene product can be used as a selectable marker to rescue the nitrogen assimilation deficiency of Chlorella sorokiniana NR mutant strains and to select for Chlorella sorokiniana NR-mutants stably expressing the transformation vector. Growth media suitable for Chlorella sorokiniana lipid production include, but are not limited to 0.5 g/L KH2PO4, 0.5 g/L K2HPO4, 0.25 g/L MgSO4-7H2O, with supplemental micronutrients and the appropriate nitrogen and carbon sources (Patterson, Lipids Vol. 5:7 (1970), pp. 597-600). Evaluation of fatty acid profiles of Chlorella sorokiniana lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 11
Engineering Chlorella vulgaris 
Expression of recombinant genes in accordance with the present invention in Chlorella vulgaris can be accomplished by modifying the methods and vectors taught by Chow and Tung et al. as discussed herein. Briefly, Chow and Tung et al., Plant Cell Reports, Volume 18 (1999), pp. 778-780, reported the stable nuclear transformation of Chlorella vulgaris with plasmid DNA. Using the transformation method of electroporation, Chow and Tung introduced the plasmid pIG121-Hm (GenBank Accession No. AB489142) into Chlorella vulgaris. The nucleotide sequence of pIG121-Hm comprised sequence encoding a beta-glucuronidase (GUS) reporter gene product operably-linked to a CaMV 35S promoter upstream of the GUS protein-coding sequence and further operably linked to the 3′ UTR/terminator of the nopaline synthase (nos) gene downstream of the GUS protein-coding sequence. The sequence of plasmid pIG121-Hm further comprised a hygromycin B antibiotic resistance cassette. This hygromycin B antibiotic resistance cassette comprised a CaMV 35S promoter operably linked to sequence encoding the hygromycin phosphotransferase (hpt, GenBank Accession No. BAH24259) gene product. Prior to transformation, Chlorella vulgaris was unable to be propagated in culture medium comprising 50 ug/ml hygromycin B. Upon transformation with the pIG121-Hm plasmid, transformants of Chlorella vulgaris were obtained that were propagated in culture medium comprising 50 ug/ml hygromycin B. The expression of the hpt gene product in Chlorella vulgaris enabled propagation of transformed Chlorella vulgaris in the presence of 50 ug/mL hygromycin B, thereby establishing the utility of the a hygromycin B resistance cassette as a selectable marker for use in Chlorella vulgaris. Detectable activity of the GUS reporter gene indicated that CaMV 35S promoter and nos 3′UTR are suitable for enabling heterologous gene expression in Chlorella vulgaris. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Selection and maintenance of transformed Chlorella vulgaris was performed on agar plates comprising YA medium (agar and 4 g/L yeast extract). The propagation of Chlorella vulgaris in liquid culture medium was conducted as discussed by Chow and Tung. Propagation of Chlorella vulgaris in media other than YA medium has been described (for examples, see Chader et al., Revue des Energies Renouvelabes, Volume 14 (2011), pp. 21-26 and Illman et al., Enzyme and Microbial Technology, Vol. 27 (2000), pp. 631-635). Chow and Tung reported that the plasmid pIG121-Hm, the CaMV 35S promoter, and the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator are suitable to enable heterologous gene expression in Chlorella vulgaris. In addition, Chow and Tung reported the hygromycin B resistance cassette was suitable for use as a selectable marker in Chlorella vulgaris. Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Chlorella vulgaris have been discussed in Chader et al., Revue des Energies Renouvelabes, Volume 14 (2011), pp. 21-26.
In an embodiment of the present invention, pIG121-Hm, comprising the nucleotide sequence encoding the hygromycin B gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Chlorella vulgaris to reflect the codon bias inherent in nuclear genes of Chlorella vulgaris in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the CaMV 35S promoter upstream of the protein-coding sequence and operably linked to the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chlorella vulgaris genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Chlorella vulgaris with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the hygromycin B resistance gene product can be used as a marker to select for Chlorella vulgaris transformed with the transformation vector on, but not limited to, agar medium comprising hygromycin. Growth media suitable for Chlorella vulgaris lipid production include, but are not limited to BG11 medium (0.04 g/L KH2PO4, 0.075 g/L CaCl2, 0.036 g/L citric acid, 0.006 g/L Ammonium Ferric Citrate, 1 mg/L EDTA, and 0.02 g/L Na2CO3) supplemented with trace metals, and optionally 1.5 g/L NaNO3. Additional media suitable for culturing Chlorella vulgaris for lipid production include, for example, Watanabe medium (comprising 1.5 g/L KNO3, 1.25 g/L KH2PO4, 1.25 g l−1 MgSO4.7H2O, 20 mg l−1 FeSO4.7H2O with micronutrients and low-nitrogen medium (comprising 203 mg/l (NH4)2HPO4, 2.236 g/l KCl, 2.465 g/l MgSO4, 1.361 g/l KH2PO4 and 10 mg/l FeSO4) as reported by Illman et al., Enzyme and Microbial Technology, Vol. 27 (2000), pp. 631-635. Evaluation of fatty acid profiles of Chlorella vulgaris lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 12
Engineering Chlorella ellipsoidea 
Expression of recombinant genes in accordance with the present invention in Chlorella ellipsoidea can be accomplished by modifying the methods and vectors taught by Chen et al. as discussed herein. Briefly, Chen et al., Current Genetics, Vol. 39:5 (2001), pp. 365-370, reported the stable transformation of Chlorella ellipsoidea with plasmid DNA. Using the transformation method of electroporation, Chen introduced the plasmid pBinUΩNP-1 into Chlorella ellipsoidea. The nucleotide sequence of pBinUΩNP-1 comprised sequence encoding the neutrophil peptide-1 (NP-1) rabbit gene product operably linked to a Zea mays Ubiquitin (ubi1) gene promoter upstream of the NP-1 protein-coding region and operably linked to the 3′ UTR/terminator of the nopaline synthase (nos) gene downstream of the NP-1 protein-coding region. The sequence of plasmid pBinUΩNP-1 further comprised a G418 antibiotic resistance cassette. This G418 antibiotic resistance cassette comprised sequence encoding the aminoglycoside 3′-phosphotransferase (aph 3′) gene product. The aph 3′ gene product confers resistance to the antibiotic G418. Prior to transformation, Chlorella ellipsoidea was unable to be propagated in culture medium comprising 30 ug/mL G418. Upon transformation with the pBinUΩNP-1 plasmid, transformants of Chlorella ellipsoidea were obtained that were propagated in selective culture medium comprising 30 ug/mL G418. The expression of the aph 3′ gene product in Chlorella ellipsoidea enabled propagation of transformed Chlorella ellipsoidea in the presence of 30 ug/mL G418, thereby establishing the utility of the G418 antibiotic resistance cassette as selectable marker for use in Chlorella ellipsoidea. Detectable activity of the NP-1 gene product indicated that the ubi1 promoter and nos 3′ UTR are suitable for enabling heterologous gene expression in Chlorella ellipsoidea. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Selection and maintenance of the transformed Chlorella ellipsoidea was performed on Knop medium (comprising 0.2 g/L K2HPO4, 0.2 g/L MgSO4.7H2O, 0.12 g/L KCl, and 10 mg/L FeCl3, pH 6.0-8.0 supplemented with 0.1% yeast extract and 0.2% glucose) with 15 ug/mL G418 (for liquid cultures) or with 30 ug/mL G418 (for solid cultures comprising 1.8% agar). Propagation of Chlorella ellipsoidea in media other than Knop medium has been reported (see Cho et al., Fisheries Science, Vol. 73:5 (2007), pp. 1050-1056, Jarvis and Brown, Current Genetics, Vol. 19 (1991), pp. 317-321 and Kim et al., Marine Biotechnology, Vol. 4 (2002), pp. 63-73). Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Chlorella ellipsoidea have been reported (see Jarvis and Brown and Kim et al., Marine Biotechnology, Vol. 4 (2002), pp. 63-73). Chen reported that the plasmid pBinUΩNP-1, the ubi1 promoter, and the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator are suitable to enable exogenous gene expression in Chlorella ellipsoidea. In addition, Chen reported that the G418 resistance cassette encoded on pBinUΩNP-1 was suitable for use as a selectable marker in Chlorella ellipsoidea. 
In an embodiment of the present invention, vector pBinUΩNP-1, comprising the nucleotide sequence encoding the aph 3′ gene product, conferring resistance to G418, for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Chlorella ellipsoidea to reflect the codon bias inherent in nuclear genes of Chlorella ellipsoidea in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Zea mays ubi1 promoter upstream of the protein-coding sequence and operably linked to the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chlorella ellipsoidea genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Chlorella ellipsoidea with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the aph 3′ gene product can be used as a marker to select for Chlorella ellipsoidea transformed with the transformation vector on, but not limited to, Knop agar medium comprising G418. Growth media suitable for Chlorella ellipsoidea lipid production include, but are not limited to, Knop medium and those culture medium reported by Jarvis and Brown and Kim et al. Evaluation of fatty acid profiles of Chlorella ellipsoidea lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 13
Engineering Chlorella kessleri 
Expression of recombinant genes in accordance with the present invention in Chlorella kessleri can be accomplished by modifying the methods and vectors taught by El-Sheekh et al. as discussed herein. Briefly, El-Sheekh et al., Biologia Plantarium, Vol. 42:2 (1999), pp. 209-216, reported the stable transformation of Chlorella kessleri with plasmid DNA. Using the transformation method of microprojectile bombardment, El-Sheekh introduced the plasmid pBI121 (GenBank Accession No. AF485783) into Chlorella kessleri. Plasmid pBI121 comprised a kanamycin/neomycin antibiotic resistance cassette. This kanamycin/neomycin antibiotic resistance cassette comprised the Agrobacterium tumefaciens nopaline synthase (nos) gene promoter, sequence encoding the neomycin phosphotransferase II (nptII) gene product (GenBank Accession No. AAL92039) for resistance to kanamycin and G418, and the 3′ UTR/terminator of the Agrobacterium tumefaciens nopaline synthase (nos) gene. pBI121 further comprised sequence encoding a beta-glucuronidase (GUS) reporter gene product operably linked to a CaMV 35S promoter and operably linked to a 3′ UTR/terminator of the nos gene. Prior to transformation, Chlorella kessleri was unable to be propagated in culture medium comprising 15 ug/L kanamycin. Upon transformation with the pBI121plasmid, transformants of Chlorella kessleri were obtained that were propagated in selective culture medium comprising 15 mg/L kanamycin. The express ion of the nptII gene product in Chlorella kessleri enabled propagation in the presence of 15 mg/L kanamycin, thereby establishing the utility of the kanamycin/neomycin antibiotic resistance cassette as selectable marker for use in Chlorella kessleri. Detectable activity of the GUS gene product indicated that the CaMV 35S promoter and nos 3′ UTR are suitable for enabling heterologous gene expression in Chlorella kessleri. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. As reported by El-Sheekh, selection and maintenance of transformed Chlorella kessleri was conducted on semisolid agar plates comprising YEG medium (1% yeast extract, 1% glucose) and 15 mg/L kanamycin. El-Sheekh also reported the propagation of Chlorella kessleri in YEG liquid culture media. Additional media suitable for culturing Chlorella kessleri for lipid production are disclosed in Sato et al., BBA Molecular and Cell Biology of Lipids, Vol. 1633 (2003), pp. 27-34). El-Sheekh reported that the plasmid pBI121, the CaMV promoter, and the nopaline synthase gene 3′UTR/terminator are suitable to enable heterologous gene expression in Chlorella kessleri. In addition, El-Sheekh reported that the kanamycin/neomycin resistance cassette encoded on pBI121 was suitable for use as a selectable marker in Chlorella kessleri. 
In an embodiment of the present invention, vector pBI121, comprising the nucleotide sequence encoding the kanamycin/neomycin resistance gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Chlorella kessleri to reflect the codon bias inherent in nuclear genes of Chlorella kessleri in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the CaMV 35S promoter upstream of the protein-coding sequence and operably linked to the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chlorella kessleri genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Chlorella kessleri with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the nptII gene product can be used as a marker to select for Chlorella kessleri transformed with the transformation vector on, but not limited to, YEG agar medium comprising kanamycin or neomycin. Growth media suitable for Chlorella kessleri lipid production include, but are not limited to, YEG medium, and those culture media reported by Sato et al. Evaluation of fatty acid profiles of Chlorella kessleri lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 14
Engineering Dunaliella tertiolecta 
Expression of recombinant genes in accordance with the present invention in Dunaliella tertiolecta can be accomplished by modifying the methods and vectors taught by Walker et al. as discussed herein. Briefly, Walker et al., Journal of Applied Phycology, Vol. 17 (2005), pp. 363-368, reported stable nuclear transformation of Dunaliella tertiolecta with plasmid DNA. Using the transformation method of electroporation, Walker introduced the plasmid pDbleFLAG1.2 into Dunaliella tertiolecta. pDbleFLAG1.2 comprised sequence encoding a bleomycin antibiotic resistance cassette, comprising sequence encoding the Streptoalloteichus hindustanus Bleomycin binding protein (ble), for resistance to the antibiotic phleomycin, operably linked to the promoter and 3′ UTR of the Dunaliella tertiolecta ribulose-1,5-bisphosphate carboxylase/oxygenase small subunit gene (rbcS1, GenBank Accession No. AY530155). Prior to transformation, Dunaliella tertiolecta was unable to be propagated in culture medium comprising 1 mg/L phleomycin. Upon transformation with the pDbleFLAG1.2 plasmid, transformants of Dunaliella tertiolecta were obtained that were propagated in selective culture medium comprising 1 mg/L phleomycin. The expression of the ble gene product in Dunaliella tertiolecta enabled propagation in the presence of 1 mg/L phleomycin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Dunaliella tertiolecta. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. As reported by Walker, selection and maintenance of transformed Dunaliella tertiolecta was conducted in Dunaliella medium (DM, as described by Provasoli et al., Archiv fur Mikrobiologie, Vol. 25 (1957), pp. 392-428) further comprising 4.5 g/L NaCl and 1 mg/L pheomycin. Additional media suitable for culturing Dunaliella tertiolecta for lipid production are discussed in Takagi et al., Journal of Bioscience and Bioengineering, Vol. 101:3 (2006), pp. 223-226 and in Massart and Hanston, Proceedings Venice 2010, Third International Symposium on Energy from Biomass and Waste. Walker reported that the plasmid pDbleFLAG1.2 and the promoter and 3′ UTR of the Dunaliella tertiolecta ribulose-1,5-bisphosphate carboxylase/oxygenase small subunit gene are suitable to enable heterologous expression in Dunaliella tertiolecta. In addition, Walker reported that the bleomycin resistance cassette encoded on pDbleFLAG1.2 was suitable for use as a selectable marker in Dunaliella tertiolecta. 
In an embodiment of the present invention, vector pDbleFLAG1.2, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Dunaliella tertiolecta to reflect the codon bias inherent in nuclear genes of Dunaliella tertiolecta in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the rbcS1 promoter upstream of the protein-coding sequence and operably linked to the rbcS1 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Dunaliella tertiolecta genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Dunaliella tertiolecta with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the ble gene product can be used as a marker to select for Dunaliella tertiolecta transformed with the transformation vector on, but not limited to, DM medium comprising pheomycin. Growth medium suitable for Dunaliella tertiolecta lipid production include, but are not limited to DM medium and those culture media described by Takagi et al. and Massart and Hanston. Evaluation of fatty acid profiles of Dunaliella tertiolecta lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 15
Engineering Volvox carteri 
Expression of recombinant genes in accordance with the present invention in Volvox carteri can be accomplished by modifying the methods and vectors taught by Hallman and Rappel et al. as discussed herein. Briefly, Hallman and Rappel et al., The Plant Journal, Volume 17 (1999), pp. 99-109, reported the stable nuclear transformation of Volvox carteri with plasmid DNA. Using the transformation method of microprojectile bombardment, Hallman and Rappel introduced the pzeoE plasmid into Volvox carteri. The pzeoE plasmid comprised sequence encoding a bleomycin antibiotic resistance cassette, comprising sequence encoding the Streptoalloteichus hindustanus Bleomycin binding protein (ble), for resistance to the antibiotic zeocin, operably linked to and the promoter and 3′ UTR of the Volvox carteri beta-tubulin gene (GenBank Accession No. L24547). Prior to transformation, Volvox carteri was unable to be propagated in culture medium comprising 1.5 ug/ml zeocin. Upon transformation with the pzeoE plasmid, transformants of Volvox carteri were obtained that were propagated in selective culture medium comprising greater than 20 ug/ml zeocin. The expression of the ble gene product in Volvox carteri enabled propagation in the presence of 20 ug/ml zeocin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Volvox carteri. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. As reported by Hallman and Rappel, selection and maintenance of transformed Volvox carteri was conducted in Volvox medium (VM, as described by Provasoli and Pintner, The Ecology of Algae, Special Publication No. 2 (1959), Tyron, C. A. and Hartman, R. T., eds., Pittsburgh: University of Pittsburgh, pp. 88-96) with 1 mg/L pheomycin. Media suitable for culturing Volvox carteri for lipid production are also discussed by Starr in Starr R, C., Dev Biol Suppl., Vol. 4 (1970), pp. 59-100). Hallman and Rappel reported that the plasmid pzeoE and the promoter and 3′ UTR of the Volvox carteri beta-tubulin gene are suitable to enable heterologous expression in Volvox carteri. In addition, Hallman and Rappel reported that the bleomycin resistance cassette encoded on pzeoE was suitable for use as a selectable marker in Volvox carteri. Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Volvox carteri and suitable for use as selective markers Volvox carteri in have been reported (for instance see Hallamann and Sumper, Proceedings of the National Academy of Sciences, Vol. 91 (1994), pp 11562-11566 and Hallman and Wodniok, Plant Cell Reports, Volume 25 (2006), pp. 582-581).
In an embodiment of the present invention, vector pzeoE, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 19, each protein-coding sequence codon-optimized for expression in Volvox carteri to reflect the codon bias inherent in nuclear genes of Volvox carteri in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Volvox carteri beta-tubulin promoter upstream of the protein-coding sequence and operably linked to the Volvox carteri beta-tubulin 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Volvox carteri genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Volvox carteri genome (referenced in the publication by Prochnik et al., Science, Vol. 329:5988 (2010), pp 223-226). Stable transformation of Volvox carteri with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the ble gene product can be used as a marker to select for Volvox carteri transformed with the transformation vector on, but not limited to, VM medium comprising zeocin. Growth medium suitable for Volvox carteri lipid production include, but are not limited to VM medium and those culture media discussed by Starr. Evaluation of fatty acid profiles of Volvox carteri lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 16
Engineering Haematococcus pluvialis 
Expression of recombinant genes in accordance with the present invention in Haematococcus pluvialis can be accomplished by modifying the methods and vectors taught by Steinbrenner and Sandmann et al. as discussed herein. Briefly, Steinbrenner and Sandmann et al., Applied and Environmental Microbiology, Vol. 72:12 (2006), pp. 7477-7484, reported the stable nuclear transformation of Haematococcus pluvialis with plasmid DNA. Using the transformation method of microprojectile bombardment, Steinbrenner introduced the plasmid pPlat-pds-L504R into Haematococcus pluvialis. The plasmid pPlat-pds-L504R comprised a norflurazon resistance cassette, which comprised the promoter, protein-coding sequence, and 3′UTR of the Haematococcus pluvialis phytoene desaturase gene (Pds, GenBank Accession No. AY781170), wherein the protein-coding sequence of Pds was modified at position 504 (thereby changing a leucine to an arginine) to encode a gene product (Pds-L504R) that confers resistance to the herbicide norflurazon. Prior to transformation with pPlat-pds-L504R, Haematococcus pluvialis was unable to propagate on medium comprising 5 uM norflurazon. Upon transformation with the pPlat-pds-L504R plasmid, transformants of Haematococcus pluvialis were obtained that were propagated in selective culture medium comprising 5 uM norflurazon. The expression of the Pds-L504R gene product in Haematococcus pluvialis enabled propagation in the presence of 5 uM norflurazon, thereby establishing the utility of the norflurazon herbicide resistance cassette as selectable marker for use in Haematococcus pluvialis. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. As reported by Steinbrenner, selection and maintenance of transformed Haematococcus pluvialis was conducted on agar plates comprising OHA medium (OHM (0.41 g/L KNO3, 0.03 g/L Na2HPO4, 0.246 g/L MgSO4.7H2O, 0.11 g/L CaCl2.2H2O, 2.62 mg/L Fe(III)citrate×H2O, 0.011 mg/L CoCl2.6H2O, 0.012 mg/L CuSO4.5H2O, 0.075 mg/L Cr2O3, 0.98 mg/L MnCl2.4H2O, 0.12 mg/L Na2MoO4×2H2O, 0.005 mg/L SeO2 and 25 mg/L biotin, 17.5 mg/L thiamine, and 15 mg/L vitamin B12), supplemented with 2.42 g/L Tris-acetate, and 5 mM norflurazon. Propagation of Haematococcus pluvialis in liquid culture was performed by Steinbrenner and Sandmann using basal medium (basal medium as described by Kobayashi et al., Applied and Environmental Microbiology, Vol. 59 (1993), pp. 867-8′73). Steinbrenner and Sandmann reported that the pPlat-pds-L504R plasmid and promoter and 3′ UTR of the Haematococcus pluvialis phytoene desaturase gene are suitable to enable heterologous expression in Haematococcus pluvialis. In addition, Steinbrenner and Sandmann reported that the norflurazon resistance cassette encoded on pPlat-pds-L504R was suitable for use as a selectable marker in Haematococcus pluvialis. Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Haematococcus pluvialis have been reported (see Kathiresan et al., Journal of Phycology, Vol. 45 (2009), pp 642-649).
In an embodiment of the present invention, vector pPlat-pds-L504R, comprising the nucleotide sequence encoding the Pds-L504R gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Haematococcus pluvialis to reflect the codon bias inherent in nuclear genes of Haematococcus pluvialis in accordance with Tables 19 A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Haematococcus pluvialis pds gene promoter upstream of the protein-coding sequence and operably linked to the Haematococcus pluvialis pds gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Haematococcus pluvialis genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Haematococcus pluvialis with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the Pds-L504R gene product can be used as a marker to select for Haematococcus pluvialis transformed with the transformation vector on, but not limited to, OHA medium comprising norflurazon. Growth media suitable for Haematococcus pluvialis lipid production include, but are not limited to basal medium and those culture media described by Kobayashi et al., Kathiresan et al, and Gong and Chen, Journal of Applied Phycology, Vol. 9:5 (1997), pp. 437-444). Evaluation of fatty acid profiles of Haematococcus pluvialis lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 17
Engineering Closterium peracerosum-strigosum-littorale complex  
Expression of recombinant genes in accordance with the present invention in Closterium peracerosum-strigosum-littorale complex can be accomplished by modifying the methods and vectors taught by Abe et al. as discussed herein. Briefly, Abe et al., Plant Cell Physiology, Vol. 52:9 (2011), pp. 1676-1685, reported the stable nuclear transformation of Closterium peracerosum-strigosum-littorale complex with plasmid DNA. Using the transformation methods of microprojectile bombardment, Abe introduced the plasmid pSA106 into Closterium peracerosum-strigosum-littorale complex. Plasmid pSA106 comprised a bleomycin resistance cassette, comprising sequence encoding the Streptoalloteichus hindustanus Bleomycin binding protein gene (ble, GenBank Accession No. CAA37050) operably linked to the promoter and 3′ UTR of the Closterium peracerosum-strigosum-littorale complex Chlorophyll a/b-binding protein gene (CAB, GenBank Accession No. AB363403). Prior to transformation with pSA106, Closterium peracerosum-strigosum-littorale complex was unable to propagate on medium comprising 3 ug/ml phleomycin. Upon transformation with pSA106, transformants of Closterium peracerosum-strigosum-littorale complex were obtained that were propagated in selective culture medium comprising 3 ug/ml phleomycin. The expression of the ble gene product in Closterium peracerosum-strigosum-littorale complex enabled propagation in the presence of 3 ug/ml phleomycin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Closterium peracerosum-strigosum-littorale complex. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. As reported by Abe, selection and maintenance of transformed Closterium peracerosum-strigosum-littorale complex was conducted first in top agar with C medium (0.1 g/L KNO3, 0.015 g/L Ca(NO3)2.4H2O, 0.05 g/L glycerophosphate-Na2, 0.04 g/L MgSO4.7H2O, 0.5 g/L Tris(hydroxylmethyl)aminomethane, trace minerals, biotin, vitamins B1 and B12) and then subsequently isolated to agar plates comprising C medium supplemented with phleomycin. As reported by Abe, propagation of Closterium peracerosum-strigosum-littorale complex in liquid culture was performed in C medium. Additional liquid culture medium suitable for propagation of Closterium peracerosum-strigosum-littorale complex are discussed by Sekimoto et al., DNA Research, 10:4 (2003), pp. 147-153. Abe reported that the pSA106 plasmid and promoter and 3′ UTR of the Closterium peracerosum-strigosum-littorale complex CAB gene are suitable to enable heterologous gene expression in Closterium peracerosum-strigosum-littorale complex. In addition, Abe reported that the bleomycin resistance cassette encoded on pSA106 was suitable for use as a selectable marker in Closterium peracerosum-strigosum-littorale complex. Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Closterium peracerosum-strigosum-littorale complex have been reported (see Abe et al., Plant Cell Physiology, Vol. 49 (2008), pp. 625-632).
In an embodiment of the present invention, vector pSA106, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Closterium peracerosum-strigosum-littorale complex to reflect the codon bias inherent in nuclear genes of Closterium peracerosum-strigosum-littorale complex in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Closterium peracerosum-strigosum-littorale complex CAB gene promoter upstream of the protein-coding sequence and operably linked to the Closterium peracerosum-strigosum-littorale complex CAB gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Closterium peracerosum-strigosum-littorale complex genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Closterium peracerosum-strigosum-littorale complex with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the ble gene product can be used as a marker to select for Closterium peracerosum-strigosum-littorale complex transformed with the transformation vector on, but not limited to, C medium comprising phleomycin. Growth media suitable for Closterium peracerosum-strigosum-littorale complex lipid production include, but are not limited to C medium and those culture media reported by Abe et al. and Sekimoto et al. Evaluation of fatty acid profiles of Closterium peracerosum-strigosum-littorale complex lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 18
Engineering Dunaliella viridis 
Expression of recombinant genes in accordance with the present invention in Dunaliella viridis can be accomplished by modifying the methods and vectors taught by Sun et al. as discussed herein. Briefly, Sun et al., Gene, Vol. 377 (2006), pp. 140-149, reported the stable transformation of Dunaliella viridis with plasmid DNA. Using the transformation method of electroporation, Sun introduced the plasmid pDVNR, encoding the full Dunaliella viridis nitrate reductase gene into mutant Dunaliella viridis (Dunaliella viridis NR-mutants.) The NR-mutants are incapable of growth without the use of nitrate as a source of nitrogen. Nitrate reductase catalyzes the conversion of nitrate to nitrite. Prior to transformation, Dunaliella viridis NR-mutants were unable to propagate in culture medium comprising nitrate (NO3−) as the sole nitrogen source. The expression of the Dunaliella viridis NR gene product in NR-mutant Dunaliella viridis was used as a selectable marker to rescue the nitrate metabolism deficiency. Upon transformation with the pDVNR plasmid, NR-mutant Dunaliella viridis stably expressing the Dunaliella viridis NR gene product were obtained that were able to grow on agar plates comprising nitrate as the sole carbon source. Evaluation of the DNA of the stable transformants was performed by Southern analysis. Selection and maintenance of the transformed Dunaliella viridis (NR mutant) was performed on agar plates comprising 5 mM KNO3. Sun also reported the propagation of Dunaliella viridis and Dunaliella viridis NR mutants in liquid culture medium. Additional media suitable for propagation of Dunaliella viridis are reported by Gordillo et al., Journal of Applied Phycology, Vol. 10:2 (1998), pp. 135-144 and by Moulton and Burford, Hydrobiologia, Vols. 204-205:1 (1990), pp. 401-408. Sun reported that the plasmid pDVNR and the promoter and 3′ UTR/terminator of the Dunaliella viridis nitrate reductase gene were suitable to enable heterologous expression in Dunaliella viridis NR-mutants. Sun also reported that expression of the Dunaliella viridis nitrate reductase gene product was suitable for use as a selectable marker in Dunaliella viridis NR-mutants.
In an embodiment of the present invention, vector pDVNR, comprising the nucleotide sequence encoding the Dunaliella viridis nitrate reductase (DvNR) gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Dunaliella viridis to reflect the codon bias inherent in nuclear genes of Dunaliella viridis in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the DvNR promoter upstream of the protein-coding sequence and operably linked to the DvNR 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Dunaliella viridis genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Dunaliella viridis NR mutants with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the DvNR gene product can be used as a selectable marker to rescue the nitrogen assimilation deficiency of Dunaliella viridis NR mutant strains and to select for Dunaliella viridis NR-mutants stably expressing the transformation vector. Growth media suitable for Dunaliella viridis lipid production include, but are not limited to those discussed by Sun et al., Moulton and Burford, and Gordillo et al. Evaluation of fatty acid profiles of Dunaliella viridis lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 19
Engineering Dunaliella salina 
Expression of recombinant genes in accordance with the present invention in Dunaliella salina can be accomplished by modifying the methods and vectors taught by Geng et al. as discussed herein. Briefly, Geng et al., Journal of Applied Phycology, Vol. 15 (2003), pp. 451-456, reported the stable transformation of Dunaliella salina with plasmid DNA. Using the transformation method of electroporation, Geng introduced the pUΩHBsAg-CAT plasmid into Dunaliella salina. pUΩHBsAg-CAT comprises a hepatitis B surface antigen (HBsAG) expression cassette comprising sequence encoding the hepatitis B surface antigen operably linked to a Zea mays ubi1 promoter upstream of the HBsAG protein-coding region and operably linked to the 3′UTR/terminator of the Agrobacterium tumefaciens nopaline synthase gene (nos) downstream of the HBsAG protein-coding region. pUΩHBsAg-CAT further comprised a chloramphenicol resistance cassette, comprising sequence encoding the chloramphenicol acetyltransferase (CAT) gene product, conferring resistance to the antibiotic chloramphenicol, operably linked to the simian virus 40 promoter and enhancer. Prior to transformation with pUΩHBsAg-CAT, Dunaliella salina was unable to propagate on medium comprising 60 mg/L chloramphenicol. Upon transformation with the pUΩHBsAg-CAT plasmid, transformants of Dunaliella salina were obtained that were propagated in selective culture medium comprising 60 mg/L chloramphenicol. The expression of the CAT gene product in Dunaliella salina enabled propagation in the presence of 60 mg/L chloramphenicol, thereby establishing the utility of the chloramphenicol resistance cassette as selectable marker for use in Dunaliella salina. Detectable activity of the HBsAg gene product indicated that ubi1 promoter and nos 3′UTR/terminator are suitable for enabling gene expression in Dunaliella salina. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Geng reported that selection and maintenance of the transformed Dunaliella salina was performed on agar plates comprising Johnson's medium (J1, described by Borowitzka and Borowitzka (eds), Micro-algal Biotechnology. Cambridge University Press, Cambridge, pp. 460-461) with 60 mg/L chloramphenicol. Liquid propagation of Dunaliella salina was performed by Geng in J1 medium with 60 mg/L chloramphenicol. Propagation of Dunaliella salina in media other than J1 medium has been discussed (see Feng et al., Mol. Bio. Reports, Vol. 36 (2009), pp. 1433-1439 and Borowitzka et al., Hydrobiologia, Vols. 116-117:1 (1984), pp. 115-121). Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Dunaliella salina have been reported by Feng et al. Geng reported that the plasmid pUΩHBsAg-CAT, the ubi1 promoter, and the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator are suitable to enable exogenous gene expression in Dunaliella salina. In addition, Geng reported that the CAT resistance cassette encoded on pUΩHBsAg-CAT was suitable for use as a selectable marker in Dunaliella salina. 
In an embodiment of the present invention, vector pUΩHBsAg-CAT, comprising the nucleotide sequence encoding the CAT gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Dunaliella salina to reflect the codon bias inherent in nuclear genes of Dunaliella salina in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the ubi1 promoter upstream of the protein-coding sequence and operably linked to the Agrobacterium tumefaciens nopaline synthase gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Dunaliella salina genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Dunaliella salina with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the CAT gene product can be used as a selectable marker to select for Dunaliella salina transformed with the transformation vector in, but not limited to, J1 medium comprising chloramphenicol. Growth medium suitable for Dunaliella salina lipid production include, but are not limited to J1 medium and those culture media described by Feng et al. and Borowitzka et al. Evaluation of fatty acid profiles of Dunaliella salina lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 20
Engineering Gonium pectoral 
Expression of recombinant genes in accordance with the present invention in Gonium pectoral can be accomplished by modifying the methods and vectors taught by Lerche and Hallman et al. as discussed herein. Briefly, Lerche and Hallman et al., BMC Biotechnology, Volume 9:64, 2009, reported the stable nuclear transformation of Gonium pectorale with plasmid DNA. Using the transformation method of microprojectile bombardment, Lerche introduced the plasmid pPmr3 into Gonium pectorale. Plasmid pPmr3 comprised a paromomycin resistance cassette, comprising a sequence encoding the aminoglycoside 3′-phosphotransferase (aphVIII) gene product (GenBank Accession No. AAB03856) of Streptomyces rimosus for resistance to the antibiotic paromomycin, operably linked to the Volvox carteri hsp70A-rbcS3 hybrid promoter upstream of the aphVIII protein-coding region and operably linked to the 3′ UTR/terminator of the Volvox carteri rbcS3 gene downstream of the aphVIII protein-coding region. Prior to transformation with pPmr3, Gonium pectorale was unable to propagate on medium comprising 0.06 ug/ml paromomycin. Upon transformation with pPmr3, transformants of Gonium pectorale were obtained that were propagated in selective culture medium comprising 0.75 and greater ug/ml paromomycin. The expression of the aphVIII gene product in Gonium pectorale enabled propagation in the presence of 0.75 and greater ug/ml paromomycin, thereby establishing the utility of the paromomycin antibiotic resistance cassette as selectable marker for use in Gonium pectorale. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Lerche and Hallman reported that selection and maintenance of the transformed Gonium pectorale was performed in liquid Jaworski's medium (20 mg/L Ca(NO3)2.4H2O, 12.4 mg/L KH2PO4, 50 mg/L MgSO4.7H2O, 15.9 mg/L NaHCO3, 2.25 mg/L EDTA-FeNa, 2.25 mg/L EDTA Na2, 2.48 g/L H3BO3, 1.39 g/L MnCl2.4H2O, 1 mg/L (NH4)6MO7O24.4H2O, 0.04 mg/L vitamin B12, 0.04 mg/L Thiamine-HCl, 0.04 mg/L biotin, 80 mg/L NaNO3, 36 mg/L Na4HPO4.12H2O) with 1.0 ug/ml paromomycin. Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Gonium pectorale are further discussed by Lerche and Hallman. Lerche and Hallman reported that the plasmid pPmr3, Volvox carteri hsp70A-rbcS3 hybrid promoter, and the 3′ UTR/terminator of the Volvox carteri rbcS3 gene are suitable to enable exogenous gene expression in Gonium pectorale. In addition, Lerche and Hallman reported that the paromomycin resistance cassette encoded pPmr3 was suitable for use as a selectable marker in Gonium pectorale. 
In an embodiment of the present invention, vector pPmr3, comprising the nucleotide sequence encoding the aphVIII gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Gonium pectorale to reflect the codon bias inherent in nuclear genes of Gonium pectorale in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Volvox carteri hsp70A-rbcS3 hybrid promoter upstream of the protein-coding sequence and operably linked to the Volvox carteri rbcS3 gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Gonium pectorale genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Gonium pectorale with the transformation vector can be achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the aphVIII gene product can be used as a selectable marker to select for Gonium pectorale transformed with the transformation vector in, but not limited to, Jaworski's medium comprising paromomycin. Growth media suitable for Gonium pectorale lipid production include Jaworski's medium and media reported by Stein, American Journal of Botany, Vol. 45:9 (1958), pp. 664-672. Evaluation of fatty acid profiles of Gonium pectorale lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 21
Engineering Phaeodactylum tricornutum 
Expression of recombinant genes in accordance with the present invention in Phaeodactylum tricornutum can be accomplished by modifying the methods and vectors taught by Apt et al. as discussed herein. Briefly, Apt et al., Molecular and General Genetics, Vol. 252 (1996), pp. 572-579, reported the stable nuclear transformation of Phaeodactylum tricornutum with vector DNA. Using the transformation technique of microprojectile bombardment, Apt introduced the plasmid pfcpA into Phaeodactylum tricornutum. Plasmid pfcpA comprised a bleomycin resistance cassette, comprising sequence encoding the Streptoalloteichus hindustanus Bleomycin binding protein (ble), for resistance to the antibiotics phleomycin and zeocin, operably linked to the promoter of the Phaeodactylum tricornutum fucoxanthin chlorophyll a binding protein gene (fcpA) upstream of the ble protein-coding region and operably linked to the 3′ UTR/terminator of the Phaeodactylum tricornutum fcpA gene at the 3′ region, or downstream of the ble protein-coding region. Prior to transformation with pfcpA, Phaeodactylum tricornutum was unable to propagate on medium comprising 50 ug/ml zeocin. Upon transformation with pfcpA, transformants of Phaeodactylum tricornutum were obtained that were propagated in selective culture medium comprising 50 ug/ml zeocin. The expression of the ble gene product in Phaeodactylum tricornutum enabled propagation in the presence of 50 ug/ml zeocin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Phaeodactylum tricornutum. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Apt reported that selection and maintenance of the transformed Phaeodactylum tricornutum was performed on agar plates comprising LDM medium (as reported by Starr and Zeikus, Journal of Phycology, Vol. 29, Supplement, (1993)) with 50 mg/L zeocin. Apt reported liquid propagation of Phaeodactylum tricornutum transformants in LDM medium with 50 mg/L zeocin. Propagation of Phaeodactylum tricornutum in medium other than LDM medium has been discussed (by Zaslayskaia et al., Science, Vol. 292 (2001), pp. 2073-2075, and by Radokovits et al., Metabolic Engineering, Vol. 13 (2011), pp. 89-95). Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Phaeodactylum tricornutum have been reported in the same report by Apt et al., by Zaslayskaia et al., and by Radokovits et al.). Apt reported that the plasmid pfcpA, and the Phaeodactylum tricornutum fcpA promoter and 3′ UTR/terminator are suitable to enable exogenous gene expression in Phaeodactylum tricornutum. In addition, Apt reported that the bleomycin resistance cassette encoded on pfcpA was suitable for use as a selectable marker in Phaeodactylum tricornutum. 
In an embodiment of the present invention, vector pfcpA, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Phaeodactylum tricornutum to reflect the codon bias inherent in nuclear genes of Phaeodactylum tricornutum in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Phaeodactylum tricornutum fcpA gene promoter upstream of the protein-coding sequence and operably linked to the Phaeodactylum tricornutum fcpA gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Phaeodactylum tricornutum genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Phaeodactylum tricornutum genome (referenced in the publication by Bowler et al., Nature, Vol. 456 (2008), pp. 239-244). Stable transformation of Phaeodactylum tricornutum with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the ble gene product can be used as a marker to select for Phaeodactylum tricornutum transformed with the transformation vector in, but not limited to, LDM medium comprising paromomycin. Growth medium suitable for Phaeodactylum tricornutum lipid production include, but are not limited to f/2 medium as reported by Radokovits et al. Evaluation of fatty acid profiles of Phaeodactylum tricornutum lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 22
Engineering Chaetoceros sp.
Expression of recombinant genes in accordance with the present invention in Chaetoceros sp. can be accomplished by modifying the methods and vectors taught by Yamaguchi et al. as discussed herein. Briefly, Yamaguchi et al., Phycological Research, Vol. 59:2 (2011), pp. 113-119, reported the stable nuclear transformation of Chaetoceros sp. with plasmid DNA. Using the transformation method of microprojectile bombardment, Yamaguchi introduced the plasmid pTpfcp/nat into Chaetoceros sp. pTpfcp/nat comprised a nourseothricin resistance cassette, comprising sequence encoding the nourseothricin acetyltransferase (nat) gene product (GenBank Accession No. AAC60439) operably linked to the Thalassiosira pseudonana fucoxanthin chlorophyll a/c binding protein gene (fcp) promoter upstream of the nat protein-coding region and operably linked to the Thalassiosira pseudonana fcp gene 3′ UTR/terminator at the 3′ region (downstream of the nat protein coding-sequence). The nat gene product confers resistance to the antibiotic nourseothricin. Prior to transformation with pTpfcp/nat, Chaetoceros sp. was unable to propagate on medium comprising 500 ug/ml nourseothricin. Upon transformation with pTpfcp/nat, transformants of Chaetoceros sp. were obtained that were propagated in selective culture medium comprising 500 ug/ml nourseothricin. The expression of the nat gene product in Chaetoceros sp. enabled propagation in the presence of 500 ug/ml nourseothricin, thereby establishing the utility of the nourseothricin antibiotic resistance cassette as selectable marker for use in Chaetoceros sp. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Yamaguchi reported that selection and maintenance of the transformed Chaetoceros sp. was performed on agar plates comprising f/2 medium (as reported by Guilard, R. R., Culture of Phytoplankton for feeding marine invertebrates, In Culture of Marine Invertebrate Animals, Smith and Chantey (eds) 1975, Plenum Press, New York, pp. 26-60) with 500 ug/ml nourseothricin. Liquid propagation of Chaetoceros sp. transformants, as performed by Yamaguchi, was carried out in f/2 medium with 500 mg/L nourseothricin. Propagation of Chaetoceros sp. in additional culture medium has been reported (for example in Napolitano et al., Journal of the World Aquaculture Society, Vol. 21:2 (1990), pp. 122-130, and by Volkman et al., Journal of Experimental Marine Biology and Ecology, Vol. 128:3 (1989), pp. 219-240). Additional plasmids, promoters, 3′UTR/terminators, and selectable markers suitable for enabling heterologous gene expression in Chaetoceros sp. have been reported in the same report by Yamaguchi et al. Yamaguchi reported that the plasmid pTpfcp/nat, and the Thalassiosira pseudonana fcp promoter and 3′ UTR/terminator are suitable to enable exogenous gene expression in Chaetoceros sp. In addition, Yamaguchi reported that the nourseothricin resistance cassette encoded on pTpfcp/nat was suitable for use as a selectable marker in Chaetoceros sp.
In an embodiment of the present invention, vector pTpfcp/nat, comprising the nucleotide sequence encoding the nat gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in the closely-related Chaetoceros compressum to reflect the codon bias inherent in nuclear genes of Chaetoceros compressum in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Thalassiosira pseudonana fcp gene promoter upstream of the protein-coding sequence and operably linked to the Thalassiosira pseudonana fcp gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chaetoceros sp. genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Chaetoceros sp. with the transformation vector is achieved through well-known transformation including microprojectile bombardment or other known methods. Activity of the nat gene product can be used as a selectable marker to select for Chaetoceros sp. transformed with the transformation vector in, but not limited to, f/2 agar medium comprising nourseothricin. Growth medium suitable for Chaetoceros sp. lipid production include, but are not limited to, f/2 medium, and those culture media discussed by Napolitano et al. and Volkman et al. Evaluation of fatty acid profiles of Chaetoceros sp lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 23
Engineering Cylindrotheca fusiformis 
Expression of recombinant genes in accordance with the present invention in Cylindrotheca fusiformis can be accomplished by modifying the methods and vectors taught by Poulsen and Kroger et al. as discussed herein. Briefly, Poulsen and Kroger et al., FEBS Journal, Vol. 272 (2005), pp. 3413-3423, reported the transformation of Cylindrotheca fusiformis with plasmid DNA. Using the transformation method of microprojectile bombardment, Poulsen and Kroger introduced the pCF-ble plasmid into Cylindrotheca fusiformis. Plasmid pCF-ble comprised a bleomycin resistance cassette, comprising sequence encoding the Streptoalloteichus hindustanus Bleomycin binding protein (ble), for resistance to the antibiotics zeocin and phleomycin, operably linked to the Cylindrotheca fusiformis fucozanthin chlorophyll a/c binding protein gene (fcpA, GenBank Accession No. AY125580) promoter upstream of the ble protein-coding region and operably linked to the Cylindrotheca fusiformis fcpA gene 3′UTR/terminator at the 3′ region (down-stream of the ble protein-coding region). Prior to transformation with pCF-ble, Cylindrotheca fusiformis was unable to propagate on medium comprising 1 mg/ml zeocin. Upon transformation with pCF-ble, transformants of Cylindrotheca fusiformis were obtained that were propagated in selective culture medium comprising 1 mg/ml zeocin. The expression of the ble gene product in Cylindrotheca fusiformis enabled propagation in the presence of 1 mg/ml zeocin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Cylindrotheca fusiformis. Poulsen and Kroger reported that selection and maintenance of the transformed Cylindrotheca fusiformis was performed on agar plates comprising artificial seawater medium with 1 mg/ml zeocin. Poulsen and Kroger reported liquid propagation of Cylindrotheca fusiformis transformants in artificial seawater medium with 1 mg/ml zeocin. Propagation of Cylindrotheca fusiformis in additional culture medium has been discussed (for example in Liang et al., Journal of Applied Phycology, Vol. 17:1 (2005), pp. 61-65, and by Orcutt and Patterson, Lipids, Vol. 9:12 (1974), pp. 1000-1003). Additional plasmids, promoters, and 3′UTR/terminators for enabling heterologous gene expression in Chaetoceros sp. have been reported in the same report by Poulsen and Kroger. Poulsen and Kroger reported that the plasmid pCF-ble and the Cylindrotheca fusiformis fcp promoter and 3′ UTR/terminator are suitable to enable exogenous gene expression in Cylindrotheca fusiformis. In addition, Poulsen and Kroger reported that the bleomycin resistance cassette encoded on pCF-ble was suitable for use as a selectable marker in Cylindrotheca fusiformis. 
In an embodiment of the present invention, vector pCF-ble, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Cylindrotheca fusiformis to reflect the codon bias inherent in nuclear genes of Cylindrotheca fusiformis in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Cylindrotheca fusiformis fcp gene promoter upstream of the protein-coding sequence and operably linked to the Cylindrotheca fusiformis fcp gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Cylindrotheca fusiformis genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Cylindrotheca fusiformis with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the ble gene product can be used as a selectable marker to select for Cylindrotheca fusiformis transformed with the transformation vector in, but not limited to, artificial seawater agar medium comprising zeocin. Growth media suitable for Cylindrotheca fusiformis lipid production include, but are not limited to, artificial seawater and those media reported by Liang et al. and Orcutt and Patterson. Evaluation of fatty acid profiles of Cylindrotheca fusiformis lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 24
Engineering Amphidinium sp.
Expression of recombinant genes in accordance with the present invention in Amphidinium sp. can be accomplished by modifying the methods and vectors taught by ten Lohuis and Miller et al. as discussed herein. Briefly, ten Lohuis and Miller et al., The Plant Journal, Vol. 13:3 (1998), pp. 427-435, reported the stable transformation of Amphidinium sp. with plasmid DNA. Using the transformation technique of agitation in the presence of silicon carbide whiskers, ten Lohuis introduced the plasmid pMT NPT/GUS into Amphidinium sp. pMT NPT/GUS comprised a neomycin resistance cassette, comprising sequence encoding the neomycin phosphotransferase II (nptII) gene product (GenBank Accession No. AAL92039) operably linked to the Agrobacterium tumefaciens nopaline synthase (nos) gene promoter upstream, or 5′ of the nptII protein-coding region and operably linked to the 3′ UTR/terminator of the nos gene at the 3′ region (down-stream of the nptII protein-coding region). The nptII gene product confers resistance to the antibiotic G418. The pMT NPT/GUS plasmid further comprised sequence encoding a beta-glucuronidase (GUS) reporter gene product operably-linked to a CaMV 35S promoter and further operably linked to the CaMV 35S 3′ UTR/terminator. Prior to transformation with pMT NPT/GUS, Amphidinium sp. was unable to be propagated on medium comprising 3 mg/ml G418. Upon transformation with pMT NPT/GUS, transformants of Amphidinium sp. were obtained that were propagated in selective culture medium comprising 3 mg/ml G418. The expression of the nptII gene product in Amphidinium sp. enabled propagation in the presence of 3 mg/ml G418, thereby establishing the utility of the neomycin antibiotic resistance cassette as selectable marker for use in Amphidinium sp. Detectable activity of the GUS reporter gene indicated that CaMV 35S promoter and 3′UTR are suitable for enabling gene expression in Amphidinium sp. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. ten Lohuis and Miller reported liquid propagation of Amphidinium sp transformants in medium comprising seawater supplemented with F/2 enrichment solution (provided by the supplier Sigma) and 3 mg/ml G418 as well as selection and maintenance of Amphidinium sp. transformants on agar medium comprising seawater supplemented with F/2 enrichment solution and 3 mg/ml G418. Propagation of Amphidinium sp. in additional culture medium has been reported (for example in Mansour et al., Journal of Applied Phycology, Vol. 17:4 (2005) pp. 287-v300). An additional plasmid, comprising additional promoters, 3′UTR/terminators, and a selectable marker for enabling heterologous gene expression in Amphidinium sp. have been reported in the same report by ten Lohuis and Miller. ten Lohuis and Miller reported that the plasmid pMT NPT/GUS and the promoter and 3′ UTR/terminator of the nos and CaMV 35S genes are suitable to enable exogenous gene expression in Amphidinium sp. In addition, ten Lohuis and Miller reported that the neomycin resistance cassette encoded on pMT NPT/GUS was suitable for use as a selectable marker in Amphidinium sp.
In an embodiment of the present invention, vector pMT NPT/GUS, comprising the nucleotide sequence encoding the nptII gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Amphidinium sp. to reflect the codon bias inherent in nuclear genes of the closely-related species, Amphidinium carterae in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Agrobacterium tumefaciens nopaline synthase (nos) gene promoter upstream of the protein-coding sequence and operably linked to the nos 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Amphidinium sp. genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Amphidinium sp. with the transformation vector is achieved through well-known transformation techniques including silicon fibre-mediated microinjection or other known methods. Activity of the nptII gene product can be used as a selectable marker to select for Amphidinium sp. transformed with the transformation vector in, but not limited to, seawater agar medium comprising G418. Growth media suitable for Amphidinium sp. lipid production include, but are not limited to, artificial seawater and those media reported by Mansour et al. and ten Lohuis and Miller. Evaluation of fatty acid profiles of Amphidinium sp. lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 25
Engineering Symbiodinium microadriacticum   
Expression of recombinant genes in accordance with the present invention in Symbiodinium microadriacticum can be accomplished by modifying the methods and vectors taught by ten Lohuis and Miller et al. as discussed herein. Briefly, ten Lohuis and Miller et al., The Plant Journal, Vol. 13:3 (1998), pp. 427-435, reported the stable transformation of Symbiodinium microadriacticum with plasmid DNA. Using the transformation technique of silicon fibre-mediated microinjection, ten Lohuis introduced the plasmid pMT NPT/GUS into Symbiodinium microadriacticum. pMT NPT/GUS comprised a neomycin resistance cassette, comprising sequence encoding the neomycin phosphotransferase II (nptII) gene product (GenBank Accession No. AAL92039) operably linked to the Agrobacterium tumefaciens nopaline synthase (nos) gene promoter upstream, or 5′ of the nptII protein-coding region and operably linked to the 3′ UTR/terminator of the nos gene at the 3′ region (down-stream of the nptII protein-coding region). The nptII gene product confers resistance to the antibiotic G418. The pMT NPT/GUS plasmid further comprised sequence encoding a beta-glucuronidase (GUS) reporter gene product operably-linked to a CaMV 35S promoter and further operably linked to the CaMV 35S 3′ UTR/terminator. Prior to transformation with pMT NPT/GUS, Symbiodinium microadriacticum was unable to be propagated on medium comprising 3 mg/ml G418. Upon transformation with pMT NPT/GUS, transformants of Symbiodinium microadriacticum were obtained that were propagated in selective culture medium comprising 3 mg/ml G418. The expression of the nptII gene product in Symbiodinium microadriacticum enabled propagation in the presence of 3 mg/ml G418, thereby establishing the utility of the neomycin antibiotic resistance cassette as selectable marker for use in Symbiodinium microadriacticum. Detectable activity of the GUS reporter gene indicated that CaMV 35S promoter and 3′UTR are suitable for enabling gene expression in Symbiodinium microadriacticum. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. ten Lohuis and Miller reported liquid propagation of Symbiodinium microadriacticum transformants in medium comprising seawater supplemented with F/2 enrichment solution (provided by the supplier Sigma) and 3 mg/ml G418 as well as selection and maintenance of Symbiodinium microadriacticum transformants on agar medium comprising seawater supplemented with F/2 enrichment solution and 3 mg/ml G418. Propagation of Symbiodinium microadriacticum in additional culture medium has been discussed (for example in Iglesias-Prieto et al., Proceedings of the National Academy of Sciences, Vol. 89:21 (1992) pp. 10302-10305). An additional plasmid, comprising additional promoters, 3′UTR/terminators, and a selectable marker for enabling heterologous gene expression in Symbiodinium microadriacticum have been discussed in the same report by ten Lohuis and Miller. ten Lohuis and Miller reported that the plasmid pMT NPT/GUS and the promoter and 3′ UTR/terminator of the nos and CaMV 35S genes are suitable to enable exogenous gene expression in Symbiodinium microadriacticum. In addition, ten Lohuis and Miller reported that the neomycin resistance cassette encoded on pMT NPT/GUS was suitable for use as a selectable marker in Symbiodinium microadriacticum. 
In an embodiment of the present invention, vector pMT NPT/GUS, comprising the nucleotide sequence encoding the nptII gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected Table 20, each protein-coding sequence codon-optimized for expression in Symbiodinium microadriacticum to reflect the codon bias inherent in nuclear genes of Symbiodinium microadriacticum in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Agrobacterium tumefaciens nopaline synthase (nos) gene promoter upstream of the protein-coding sequence and operably linked to the nos 3′ UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Symbiodinium microadriacticum genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Symbiodinium microadriacticum with the transformation vector is achieved through well-known transformation techniques including silicon fibre-mediated microinjection or other known methods. Activity of the nptII gene product can be used as a selectable marker to select for Symbiodinium microadriacticum transformed with the transformation vector in, but not limited to, seawater agar medium comprising G418. Growth media suitable for Symbiodinium microadriacticum lipid production include, but are not limited to, artificial seawater and those media reported by Iglesias-Prieto et al. and ten Lohuis and Miller. Evaluation of fatty acid profiles of Symbiodinium microadriacticum lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 26
Engineering Nannochloropsis sp.
Expression of recombinant genes in accordance with the present invention in Nannochloropsis sp. W2J3B can be accomplished by modifying the methods and vectors taught by Kilian et al. as discussed herein. Briefly, Kilian et al., Proceedings of the National Academy of Sciences, Vol. 108:52 (2011) pp. 21265-21269, reported the stable nuclear transformation of Nannochloropsis with a transformation construct. Using the transformation method of electroporation, Kilian introduced the transformation construct C2 into Nannochloropsis sp. W2J3B. The C2 transformation construct comprised a bleomycin resistance cassette, comprising the coding sequence for the Streptoalloteichus hindustanus Bleomycin binding protein (ble), for resistance to the antibiotics phleomycin and zeocin, operably linked to and the promoter of the Nannochloropsis sp. W2J3B violaxanthin/chlorophyll a-binding protein gene VCP2 upstream of the ble protein-coding region and operably linked to the 3′UTR/terminator of the Nannochloropsis sp. W2J3B violaxanthin/chlorophyll a-binding gene VCP1 downstream of the ble protein-coding region. Prior to transformation with C2, Nannochloropsis sp. W2J3B was unable to propagate on medium comprising 2 ug/ml zeocin. Upon transformation with C2, transformants of Nannochloropsis sp. W2J3B were obtained that were propagated in selective culture medium comprising 2 ug/ml zeocin. The expression of the ble gene product in Nannochloropsis sp. W2J3B enabled propagation in the presence of 2 ug/ml zeocin, thereby establishing the utility of the bleomycin antibiotic resistance cassette as selectable marker for use in Nannochloropsis. Evaluation of the genomic DNA of the stable transformants was performed by PCR. Kilian reported liquid propagation of Nannochloropsis sp. W2J3B transformants in F/2 medium (reported by Guilard and Ryther, Canadian Journal of Microbiology, Vol. 8 (1962), pp. 229-239) comprising fivefold levels of trace metals, vitamins, and phosphate solution, and further comprising 2 ug/ml zeocin. Kilian also reported selection and maintenance of Nannochloropsis sp. W2J3B transformants on agar F/2 medium comprising artificial seawater 2 mg/ml zeocin. Propagation of Nannochloropsis in additional culture medium has been discussed (for example in Chiu et al., Bioresour Technol., Vol. 100:2 (2009), pp. 833-838 and Pal et al., Applied Microbiology and Biotechnology, Vol. 90:4 (2011), pp. 1429-1441.). Additional transformation constructs, comprising additional promoters and 3′UTR/terminators for enabling heterologous gene expression in Nannochloropsis sp. W2J3B and selectable markers for selection of transformants have been described in the same report by Kilian. Kilian reported that the transformation construct C2 and the promoter of the Nannochloropsis sp. W2J3B violaxanthin/chlorophyll a-binding protein gene VCP2 and 3′ UTR/terminator of the Nannochloropsis sp. W2J3B violaxanthin/chlorophyll a-binding protein gene VCP1 are suitable to enable exogenous gene expression in Nannochloropsis sp. W2J3B. In addition, Kilian reported that the bleomycin resistance cassette encoded on C2 was suitable for use as a selectable marker in Nannochloropsis sp. W2J3B.
In an embodiment of the present invention, transformation construct C2, comprising the nucleotide sequence encoding the ble gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Nannochloropsis sp. W2J3B to reflect the codon bias inherent in nuclear genes of Nannochloropsis sp. in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Nannochloropsis sp. W2J3B VCP2 gene promoter upstream of the protein-coding sequence and operably linked to the Nannochloropsis sp. W2J3B VCP1 gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Nannochloropsis sp. W2J3B genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Nannochloropsis sp. W2J3B with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the ble gene product can be used as a selectable marker to select for Nannochloropsis sp. W2J3B transformed with the transformation vector in, but not limited to, F/2 medium comprising zeocin. Growth media suitable for Nannochloropsis sp. W2J3B lipid production include, but are not limited to, F/2 medium and those media reported by Chiu et al. and Pal et al. Evaluation of fatty acid profiles of Nannochloropsis sp. W2J3B lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 27
Engineering Cyclotella cryptica 
Expression of recombinant genes in accordance with the present invention in Cyclotella cryptica can be accomplished by modifying the methods and vectors taught by Dunahay et al. as discussed herein. Briefly, Dunahay et al., Journal of Phycology, Vol. 31 (1995), pp. 1004-1012, reported the stable transformation of Cyclotella cryptica with plasmid DNA. Using the transformation method of microprojectile bombardment, Dunahay introduced the plasmid pACCNPT5.1 into Cyclotella cryptica. Plasmid pACCNPT5.1 comprised a neomycin resistance cassette, comprising the coding sequence of the neomycin phosphotransferase II (nptII) gene product operably linked to the promoter of the Cyclotella cryptica acetyl-CoA carboxylase (ACCase) gene (GenBank Accession No. L20784) upstream of the nptII coding-region and operably linked to the 3′UTR/terminator of the Cyclotella cryptica ACCase gene at the 3′ region (downstream of the nptII coding-region). The nptII gene product confers resistance to the antibiotic G418. Prior to transformation with pACCNPT5.1, Cyclotella cryptica was unable to propagate on 50% artificial seawater medium comprising 100 ug/ml G418. Upon transformation with pACCNPT5.1, transformants of Cyclotella cryptica were obtained that were propagated in selective 50% artificial seawater medium comprising 100 ug/ml G418. The expression of the nptII gene product in Cyclotella cryptica enabled propagation in the presence of 100 ug/ml G418, thereby establishing the utility of the neomycin antibiotic resistance cassette as selectable marker for use in Cyclotella cryptica. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Dunahay reported liquid propagation of Cyclotella cryptica in artificial seawater medium (ASW, as discussed by Brown, L., Phycologia, Vol. 21 (1982), pp. 408-410) supplemented with 1.07 mM sodium silicate and with 100 ug/ml G418. Dunahay also reported selection and maintenance of Cyclotella cryptica transformants on agar plates comprising ASW medium with 100 ug/ml G418. Propagation of Cyclotella cryptica in additional culture medium has been discussed (for example in Sriharan et al., Applied Biochemistry and Biotechnology, Vol. 28-29:1 (1991), pp. 317-326 and Pahl et al., Journal of Bioscience and Bioengineering, Vol. 109:3 (2010), pp. 235-239). Dunahay reported that the plasmid pACCNPT5.1 and the promoter of the Cyclotella cryptica acetyl-CoA carboxylase (ACCase) gene are suitable to enable exogenous gene expression in Cyclotella cryptica. In addition, Dunahay reported that the neomycin resistance cassette encoded on pACCNPT5.1 was suitable for use as a selectable marker in Cyclotella cryptica. 
In an embodiment of the present invention, vector pACCNPT5.1, comprising the nucleotide sequence encoding the nptII gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Cyclotella cryptica to reflect the codon bias inherent in nuclear genes of Cyclotella cryptica in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Cyclotella cryptica ACCase promoter upstream of the protein-coding sequence and operably linked to the Cyclotella cryptica ACCase 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Cyclotella cryptica genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Cyclotella cryptica with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the nptII gene product can be used as a marker to select for Cyclotella cryptica transformed with the transformation vector in, but not limited to, agar ASW medium comprising G418. Growth media suitable for Cyclotella cryptica lipid production include, but are not limited to, ASW medium and those media reported by Sriharan et al., 1991 and Pahl et al. Evaluation of fatty acid profiles of Cyclotella cryptica lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 28
Engineering Navicula saprophila 
Expression of recombinant genes in accordance with the present invention in Navicula saprophila can be accomplished by modifying the methods and vectors taught by Dunahay et al. as discussed herein. Briefly, Dunahay et al., Journal of Phycology, Vol. 31 (1995), pp. 1004-1012, reported the stable transformation of Navicula saprophila with plasmid DNA. Using the transformation method of microprojectile bombardment, Dunahay introduced the plasmid pACCNPT5.1 into Navicula saprophila. Plasmid pACCNPT5.1 comprised a neomycin resistance cassette, comprising the coding sequence of the neomycin phosphotransferase II (nptII) gene product operably linked to the promoter of the Cyclotella cryptica acetyl-CoA carboxylase (ACCase) gene (GenBank Accession No. L20784) upstream of the nptII coding-region and operably linked to the 3′UTR/terminator of the Cyclotella cryptica ACCase gene at the 3′ region (downstream of the nptII coding-region). The nptII gene product confers resistance to the antibiotic G418. Prior to transformation with pACCNPT5.1, Navicula saprophila was unable to propagate on artificial seawater medium comprising 100 ug/ml G418. Upon transformation with pACCNPT5.1, transformants of Navicula saprophila were obtained that were propagated in selective artificial seawater medium comprising 100 ug/ml G418. The expression of the nptII gene product in Navicula saprophila enabled propagation in the presence of G418, thereby establishing the utility of the neomycin antibiotic resistance cassette as selectable marker for use in Navicula saprophila. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Dunahay reported liquid propagation of Navicula saprophila in artificial seawater medium (ASW, as discussed by Brown, L., Phycologia, Vol. 21 (1982), pp. 408-410) supplemented with 1.07 mM sodium silicate and with 100 ug/ml G418. Dunahay also reported selection and maintenance of Navicula saprophila transformants on agar plates comprising ASW medium with 100 ug/ml G418. Propagation of Navicula saprophila in additional culture medium has been discussed (for example in Tadros and Johansen, Journal of Phycology, Vol. 24:4 (1988), pp. 445-452 and Sriharan et al., Applied Biochemistry and Biotechnology, Vol. 20-21:1 (1989), pp. 281-291). Dunahay reported that the plasmid pACCNPT5.1 and the promoter of the Cyclotella cryptica acetyl-CoA carboxylase (ACCase) gene are suitable to enable exogenous gene expression in Navicula saprophila. In addition, Dunahay reported that the neomycin resistance cassette encoded on pACCNPT5.1 was suitable for use as a selectable marker in Navicula saprophila. 
In an embodiment of the present invention, vector pACCNPT5.1, comprising the nucleotide sequence encoding the nptII gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Navicula saprophila to reflect the codon bias inherent in nuclear genes of the closely-related Navicula pelliculosa in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Cyclotella cryptica ACCase gene promoter upstream of the protein-coding sequence and operably linked to the Cyclotella cryptica ACCase gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Navicula saprophila genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. Stable transformation of Navicula saprophila with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the nptII gene product can be used as a selectable marker to select for Navicula saprophila transformed with the transformation vector in, but not limited to, agar ASW medium comprising G418. Growth media suitable for Navicula saprophila lipid production include, but are not limited to, ASW medium and those media reported by Sriharan et al. 1989 and Tadros and Johansen. Evaluation of fatty acid profiles of Navicula saprophila lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 29
Engineering Thalassiosira pseudonana 
Expression of recombinant genes in accordance with the present invention in Thalassiosira pseudonana can be accomplished by modifying the methods and vectors taught by Poulsen et al. as discussed herein. Briefly, Poulsen et al., Journal of Phycology, Vol. 42 (2006), pp. 1059-1065, reported the stable transformation of Thalassiosira pseudonana with plasmid DNA. Using the transformation method of microprojectile bombardment, Poulsen introduced the plasmid pTpfcp/nat in to Thalassiosira pseudonana. pTpfcp/nat comprised a nourseothricin resistance cassette, comprising sequence encoding the nourseothricin acetyltransferase (nat) gene product (GenBank Accession No. AAC60439) operably linked to the Thalassiosira pseudonana fucoxanthin chlorophyll a/c binding protein gene (fcp) promoter upstream of the nat protein-coding region and operably linked to the Thalassiosira pseudonana fcp gene 3′ UTR/terminator at the 3′ region (downstream of the nat protein coding-sequence). The nat gene product confers resistance to the antibiotic nourseothricin. Prior to transformation with pTpfcp/nat, Thalassiosira pseudonana was unable to propagate on medium comprising 10 ug/ml nourseothricin. Upon transformation with pTpfcp/nat, transformants of Thalassiosira pseudonana were obtained that were propagated in selective culture medium comprising 100 ug/ml nourseothricin. The expression of the nat gene product in Thalassiosira pseudonana enabled propagation in the presence of 100 ug/ml nourseothricin, thereby establishing the utility of the nourseothricin antibiotic resistance cassette as selectable marker for use in Thalassiosira pseudonana. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Poulsen reported that selection and maintenance of the transformed Thalassiosira pseudonana was performed in liquid culture comprising modified ESAW medium (as discussed by Harrison et al., Journal of Phycology, Vol. 16 (1980), pp. 28-35) with 100 ug/ml nourseothricin. Propagation of Thalassiosira pseudonana in additional culture medium has been discussed (for example in Volkman et al., Journal of Experimental Marine Biology and Ecology, Vol. 128:3 (1989), pp. 219-240). An additional plasmid, comprising additional selectable markers suitable for use in Thalassiosira pseudonana has been discussed in the same report by Poulsen. Poulsen reported that the plasmid pTpfcp/nat, and the Thalassiosira pseudonana fcp promoter and 3′ UTR/terminator are suitable to enable exogenous gene expression in Thalassiosira pseudonana. In addition, Poulsen reported that the nourseothricin resistance cassette encoded on pTpfcp/nat was suitable for use as a selectable marker in Thalassiosira pseudonana. 
In an embodiment of the present invention, vector pTpfcp/nat, comprising the nucleotide sequence encoding the nat gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Thalassiosira pseudonana to reflect the codon bias inherent in nuclear genes of Thalassiosira pseudonana in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Thalassiosira pseudonana fcp gene promoter upstream of the protein-coding sequence and operably linked to the Thalassiosira pseudonana fcp gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Thalassiosira pseudonana genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Thalassiosira pseudonana genome (referenced in the publication by Armbrust et al., Science, Vol. 306: 5693 (2004): pp. 79-86). Stable transformation of Thalassiosira pseudonana with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the nat gene product can be used as a marker to select for Thalassiosira pseudonana transformed with the transformation vector in but not limited to, ESAW agar medium comprising nourseothricin. Growth media suitable for Thalassiosira pseudonana lipid production include, but are not limited to, ESAW medium, and those culture media discussed by Volkman et al. and Harrison et al. Evaluation of fatty acid profiles of Thalassiosira pseudonana lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 30
Engineering Chlamydomonas reinhardtii 
Expression of recombinant genes in accordance with the present invention in Chlamydomonas reinhardtii can be accomplished by modifying the methods and vectors taught by Cerutti et al. as discussed herein. Briefly, Cerutti et al., Genetics, Vol. 145:1 (1997), pp. 97-110, reported the stable nuclear transformation of Chlamydomonas reinhardtii with a transformation vector. Using the transformation method of microprojectile bombardment, Cerutti introduced transformation construct P[1030] into Chlamydomonas reinhardtii. Construct P[1030] comprised a spectinomycin resistance cassette, comprising sequence encoding the aminoglucoside 3′′-adenyltransferase (aadA) gene product operably linked to the Chlamydomonas reinhardtii ribulose-1,5-bisphosphate carboxylase/oxygenase small subunit gene (RbcS2, GenBank Accession No. X04472) promoter upstream of the aadA protein-coding region and operably linked to the Chlamydomonas reinhardtii RbcS2 gene 3′ UTR/terminator at the 3′ region (downstream of the aadA protein coding-sequence). The aadA gene product confers resistance to the antibiotic spectinomycin. Prior to transformation with P[1030], Chlamydomonas reinhardtii was unable to propagate on medium comprising 90 ug/ml spectinomycin. Upon transformation with P[1030], transformants of Chlamydomonas reinhardtii were obtained that were propagated in selective culture medium comprising 90 ug/ml spectinomycin, thereby establishing the utility of the spectinomycin antibiotic resistance cassette as a selectable marker for use in Chlamydomonas reinhardtii. Evaluation of the genomic DNA of the stable transformants was performed by Southern analysis. Cerutti reported that selection and maintenance of the transformed Chlamydomonas reinhardtii was performed on agar plates comprising Tris-acetate-phosphate medium (TAP, as described by Harris, The Chlamydomonas Sourcebook, Academic Press, San Diego, 1989) with 90 ug/ml spectinomycin. Cerutti additionally reported propagation of Chlamydomonas reinhardtii in TAP liquid culture with 90 ug/ml spectinomycin. Propagation of Chlamydomonas reinhardtii in alternative culture medium has been discussed (for example in Dent et al., African Journal of Microbiology Research, Vol. 5:3 (2011), pp. 260-270 and Yantao et al., Biotechnology and Bioengineering, Vol. 107:2 (2010), pp. 258-268). Additional constructs, comprising additional selectable markers suitable for use in Chlamydomonas reinhardtii as well as numerous regulatory sequences, including promoters and 3′ UTRs suitable for promoting heterologous gene expression in Chlamydomonas reinhardtii are known in the art and have been discussed (for a review, see Radakovits et al., Eukaryotic Cell, Vol. 9:4 (2010), pp. 486-501). Cerutti reported that the transformation vector P[1030] and the Chlamydomonas reinhardtii promoter and 3′ UTR/terminator are suitable to enable exogenous gene expression in Chlamydomonas reinhardtii. In addition, Cerutti reported that the spectinomycin resistance cassette encoded on P[1030] was suitable for use as a selectable marker in Chlamydomonas reinhardtii. 
In an embodiment of the present invention, vector P[1030], comprising the nucleotide sequence encoding the aadA gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Chlamydomonas reinhardtii to reflect the codon bias inherent in nuclear genes of Chlamydomonas reinhardtii in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Chlamydomonas reinhardtii RbcS2 promoter upstream of the protein-coding sequence and operably linked to the Chlamydomonas reinhardtii RbcS2 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Chlamydomonas reinhardtii genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic site of an endogenous lipid biosynthesis pathway gene. One skilled in the art can identify such homology regions within the sequence of the Chlamydomonas reinhardtii genome (referenced in the publication by Merchant et al., Science, Vol. 318:5848 (2007), pp. 245-250). Stable transformation of Chlamydomonas reinhardtii with the transformation vector is achieved through well-known transformation techniques including microprojectile bombardment or other known methods. Activity of the aadA gene product can be used as a marker to select for Chlamydomonas reinhardtii transformed with the transformation vector on, but not limited to, TAP agar medium comprising spectinomycin. Growth media suitable for Chlamydomonas reinhardtii lipid production include, but are not limited to, ESAW medium, and those culture media discussed by Yantao et al. and Dent et al. Evaluation of fatty acid profiles of Chlamydomonas reinhardtii lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 31
Engineering Yarrowia lipolytica 
Expression of recombinant genes in accordance with the present invention in Yarrowia lipolytica can be accomplished by modifying the methods and vectors taught by Fickers et al. as discussed herein. Briefly, Fickers et al., Journal of Microbiological Methods, Vol. 55 (2003), pp. 727-737, reported the stable nuclear transformation of Yarrowia lipolytica with plasmid DNA. Using a lithium acetate transformation method, Fickers introduced the plasmid JMP123 into Yarrowia lipolytica. Plasmid JMP123 comprised a hygromycin B resistance cassette, comprising sequence encoding the hygromycin B phosphotransferase gene product (hph), operably-linked to the Yarrowia lipolytica LIP2 gene promoter (GenBank Accession No. AJ012632) upstream of the hph protein-coding region and operably linked to the Yarrowia lipolytica LIP2 gene 3′UTR/terminator downstream of the hph protein-coding region. Prior to transformation with JMP123, Yarrowia lipolytica were unable to propagate on medium comprising 100 ug/ml hygromycin. Upon transformation with JMP123, transformed Yarrowia lipolytica were obtained that were able to propagate on medium comprising 100 ug/ml hygromycin, thereby establishing the hygromycin B antibiotic resistance cassette as a selectable marker for use in Yarrowia lipolytica. The nucleotide sequence provided on JMP123 of the promoter and 3′UTR/terminator of the Yarrowia lipolytica LIP2 gene served as donor sequences for homologous recombination of the hph coding sequence into the LIP2 locus. Evaluation of the genomic DNA of the stable transformants was performed by Southern. Fickers reported that selection and maintenance of the transformed Yarrowia lipolytica was performed on agar plates comprising standard YPD medium (Yeast Extract Peptone Dextrose) with 100 ug/ml hygromycin. Liquid culturing of transformed Yarrowia lipolytica was performed in YPD medium with hygromycin. Other media and techniques used for culturing Yarrowia lipolytica have been reported and numerous other plasmids, promoters, 3′ UTRs, and selectable markers for use in Yarrowia lipolytica have been reported (for example see Pignede et al., Applied and Environmental Biology, Vol. 66:8 (2000), pp. 3283-3289, Chuang et al., New Biotechnology, Vol. 27:4 (2010), pp. 277-282, and Barth and Gaillardin, (1996), In: K, W. (Ed.), Nonconventional Yeasts in Biotechnology. Sprinter-Verlag, Berlin-Heidelber, pp. 313-388). Fickers reported that the transformation vector JMP123 and the Yarrowia lipolytica LIP2 gene promoter and 3′ UTR/terminator are suitable to enable heterologous gene expression in Yarrowia lipolytica. In addition, Fickers reported that the hygromycin resistance cassette encoded on JMP123 was suitable for use as a selectable marker in Yarrowia lipolytica. 
In an embodiment of the present invention, vector JMP123, comprising the nucleotide sequence encoding the hph gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Yarrowia lipolytica to reflect the codon bias inherent in nuclear genes of Yarrowia lipolytica in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Yarrowia lipolytica LIP2 gene promoter upstream of the protein-coding sequence and operably linked to the Yarrowia lipolytica LIP2 gene 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Yarrowia lipolytica genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Yarrowia lipolytica genome (referenced in the publication by Dujun et al., Nature, Vol. 430 (2004), pp. 35-44). Stable transformation of Yarrowia lipolytica with the transformation vector is achieved through well-known transformation techniques including lithium acetate transformation or other known methods. Activity of the hph gene product can be used as a marker to select for Yarrowia lipolytica transformed with the transformation vector on, but not limited to, YPD medium comprising hygromycin. Growth media suitable for Yarrowia lipolytica lipid production include, but are not limited to, YPD medium, and those culture media described by Chuang et al. Evaluation of fatty acid profiles of Yarrowia lipolytica lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 32
Engineering Mortierella alpine 
Expression of recombinant genes in accordance with the present invention in Mortierella alpine can be accomplished by modifying the methods and vectors taught by Mackenzie et al. as discussed herein. Briefly, Mackenzie et al., Applied and Environmental Microbiology, Vol. 66 (2000), pp. 4655-4661, reported the stable nuclear transformation of Mortierella alpina with plasmid DNA. Using a protoplast transformation method, MacKenzie introduced the plasmid pD4 into Mortierella alpina. Plasmid pD4 comprised a hygromycin B resistance cassette, comprising sequence encoding the hygromycin B phosphotransferase gene product (hpt), operably-linked to the Mortierella alpina histone H4.1 gene promoter (GenBank Accession No. AJ249812) upstream of the hpt protein-coding region and operably linked to the Aspergillus nidulans N-(5′-phosphoribosyl)anthranilate isomerase (trpC) gene 3′UTR/terminator downstream of the hpt protein-coding region. Prior to transformation with pD4, Mortierella alpina were unable to propagate on medium comprising 300 ug/ml hygromycin. Upon transformation with pD4, transformed Mortierella alpina were obtained that were propagated on medium comprising 300 ug/ml hygromycin, thereby establishing the hygromycin B antibiotic resistance cassette as a selectable marker for use in Mortierella alpina. Evaluation of the genomic DNA of the stable transformants was performed by Southern. Mackenzie reported that selection and maintenance of the transformed Mortierella alpina was performed on PDA (potato dextrose agar) medium comprising hygromycin. Liquid culturing of transformed Mortierella alpina by Mackenzie was performed in PDA medium or in S2GYE medium (comprising 5% glucose, 0.5% yeast extract, 0.18% NH4SO4, 0.02% MgSO4.7H2O, 0.0001% FeCl3.6H2O, 0.1%, trace elements, 10 mM K2HPO4—NaH2PO4), with hygromycin. Other media and techniques used for culturing Mortierella alpina have been reported and other plasmids, promoters, 3′ UTRs, and selectable markers for use in Mortierella alpina have been reported (for example see Ando et al., Applied and Environmental Biology, Vol. 75:17 (2009) pp. 5529-35 and Lu et al., Applied Biochemistry and Biotechnology, Vol. 164:7 (2001), pp. 979-90). Mackenzie reported that the transformation vector pD4 and the Mortierella alpina histone H4.1 promoter and A. nidulans trpC gene 3′ UTR/terminator are suitable to enable heterologous gene expression in Mortierella alpina. In addition, Mackenzie reported that the hygromycin resistance cassette encoded on pD4 was suitable for use as a selectable marker in Mortierella alpina. 
In an embodiment of the present invention, vector pD4, comprising the nucleotide sequence encoding the hpt gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Mortierella alpina to reflect the codon bias inherent in nuclear genes of Mortierella alpina in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the Mortierella alpina histone H4.1 gene promoter upstream of the protein-coding sequence and operably linked to the A. nidulans trpC 3′UTR/terminator at the 3′ region, or downstream, of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Mortierella alpina genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Mortierella alpina genome (referenced in the publication by Wang et al., PLOS One, Vol. 6:12 (2011)). Stable transformation of Mortierella alpina with the transformation vector is achieved through well-known transformation techniques including protoplast transformation or other known methods. Activity of the hpt gene product can be used as a marker to select for Mortierella alpina transformed with the transformation vector on, but not limited to, PDA medium comprising hygromycin. Growth media suitable for Mortierella alpina lipid production include, but are not limited to, S2GYE medium, and those culture media described by Lu et al. and Ando et al. Evaluation of fatty acid profiles of Mortierella alpina lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 33
Engineering Rhodococcus opacus PD630
Expression of recombinant genes in accordance with the present invention in Rhodococcus opacus PD630 can be accomplished by modifying the methods and vectors taught by Kalscheuer et al. as discussed herein. Briefly, Kalscheuer et al., Applied and Environmental Microbiology, Vol. 52 (1999), pp. 508-515, reported the stable transformation of Rhodococcus opacus with plasmid DNA. Using the transformation method of electroporation, Kalscheuer introduced the plasmid pNC9501 into Rhodococcus opacus PD630. Plasmid pNC9501 comprised a thiostrepton resistance (thior) cassette, comprising the full nucleotide sequence of the Streptomyces azureus 23S rRNA A1067 methyltransferase gene, including the gene's promoter and 3′ terminator sequence. Prior to transformation with pNC9501, Rhodococcus opacus was unable to propagate on medium comprising 1 mg/ml thiostrepton. Upon transformation of Rhodococcus opacus PD630 with pNC9501, transformants were obtained that propagated on culture medium comprising 1 mg/ml thiostrepton, thereby establishing the use of the thiostrepton resistance cassette as a selectable marker in Rhodococcus opacus PD630. A second plasmid described by Kalscheuer, pAK68, comprised the resistance thior cassette as well as the gene sequences of the Ralstonia eutropha beta-ketothiolase (phaB), acetoacetyl-CoA reductase (phaA), and poly3-hydroxyalkanoic acid synthase (phaC) genes for polyhydroxyalkanoate biosynthesis, driven by the lacZ promoter. Upon pAK68 transformation of a Rhodococcus opacus PD630 strain deficient in polyhydroxyalkanoate biosynthesis, transformed Rhodococcus opacus PD630 were obtained that produced higher amounts of polyhydroxyalkanoates than the untransformed strain. Detectable activity of the introduced Ralstonia eutropha phaB, phaA, and phaC enzymes indicted that the regulatory elements encoded on the pAK68 plasmid were suitable for heterologous gene expression in Rhodococcus opacus PD630. Kalscheuer reported that selection and maintenance of the transformed Rhodococcus opacus PD630 was performed on standard Luria Broth (LB) medium, nutrient broth (NB), or mineral salts medium (MSM) comprising thiostrepton. Other media and techniques used for culturing Rhodococcus opacus PD630 have been described (for example see Kurosawa et al., Journal of Biotechnology, Vol. 147:3-4 (2010), pp. 212-218 and Alverez et al., Applied Microbial and Biotechnology, Vol. 54:2 (2000), pp. 218-223). Kalscheuer reported that the transformation vectors pNC9501 and pAK68, the promoters of the Streptomyces azureus 23S rRNA A1067 methyltransferase gene and lacZ gene are suitable to enable heterologous gene expression in Rhodococcus opacus PD630. In addition, Kalscheuer reported that the thior cassette encoded on pNC9501 and pAK68 was suitable for use as a selectable marker in Rhodococcus opacus PD630.
In an embodiment of the present invention, vector pNC9501, comprising the nucleotide sequence encoding the thior gene product for use as a selectable marker, is constructed and modified to further comprise a lipid biosynthesis pathway expression cassette sequence, thereby creating a transformation vector. The lipid biosynthesis pathway expression cassette encodes one or more lipid biosynthesis pathway proteins selected from Table 20, each protein-coding sequence codon-optimized for expression in Rhodococcus opacus PD630 to reflect the codon bias inherent in nuclear genes of Rhodococcus opacus in accordance with Tables 19A-D. For each lipid biosynthesis pathway protein of Table 20, the codon-optimized gene sequence can individually be operably linked to the lacZ gene promoter upstream of the protein-coding sequence. The transformation construct may additionally comprise homology regions to the Rhodococcus opacus PD630 genome for targeted genomic integration of the transformation vector. Homology regions may be selected to disrupt one or more genomic sites of endogenous lipid biosynthesis pathway genes. One skilled in the art can identify such homology regions within the sequence of the Rhodococcus opacus PD630 genome (referenced in the publication by Holder et al., PLOS Genetics, Vol. 7:9 (2011). Transformation of Rhodococcus opacus PD630 with the transformation vector is achieved through well-known transformation techniques including electroporation or other known methods. Activity of the Streptomyces azureus 23S rRNA A1067 methyltransferase gene product can be used as a marker to select for Rhodococcus opacus PD630 transformed with the transformation vector on, but not limited to, LB medium comprising thiostrepton. Growth media suitable Rhodococcus opacus PD630 lipid production include, but are not limited to those culture media discussed by Kurosawa et al. and Alvarez et al. Evaluation of fatty acid profiles of Rhodococcus opacus PD630 lipids can be assessed through standard lipid extraction and analytical methods described herein.
Example 34
Engineering Microalgae for Fatty Acid Auxotrophy
Strain B of Example 3, Prototheca moriformis (UTEX 1435) engineered to express a Cuphea wrightii thioesterase (CwTE2), was used as the host organism for further genetic modification to knockout both endogenous thioesterase alleles, FATA1-1 and FATA1-2. Here, a first transformation construct was generated to integrate a neomycin expression cassette into Strain B at the FATA1-1 locus. This construct, pSZ2226, included 5′ (SEQ ID NO: 30) and 3′ (SEQ ID NO: 31) homologous recombination targeting sequences (flanking the construct) to the FATA1-1 locus of the nuclear genome and a neomycin resistance protein-coding sequence under the control of the C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and the Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This NeoR expression cassette is listed as SEQ ID NO: 15 and served as a selectable marker.
Upon transformation of pSZ2226 into Strain B, individual transformants were selected on agar plates comprising sucrose and G418. A single isolate, Strain H, was selected for further genetic modification. A second transformation construct, pSZ2236, was generated to integrate polynucleotides enabling expression of a thiamine selectable marker into Strain H at the FATA1-2 locus. pSZ2236 included 5′ (SEQ ID NO: 32) and 3′ (SEQ ID NO: 33) homologous recombination targeting sequences (flanking the construct) to the FATA1-2 genomic region for integration into the P. moriformis (UTEX 1435) nuclear genome and an A. thaliana THIC protein coding region under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This AtTHIC expression cassette is listed as SEQ ID NO: 23 and served as a selectable marker. Upon transformation of Strain H with pSZ2236 to generate Strain I, individual transformants, were selected on agar plates comprising free fatty acids. Strain I was able to propagate on agar plates and in medium lacking thiamine and supplemented with free fatty acids.
Example 35
Engineering Microorganisms for Increased Production of Stearic Acid
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain J, was transformed with the plasmid construct pSZ2281 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. pSZ2281 included polynucleotides encoding RNA hairpins (SAD2hpC, SEQ ID NO: 34) to down-regulate the expression of stearoyl-ACP desaturase, 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4), to express the protein sequence given in SEQ ID NO: 3, under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. The polynucleotide sequence encoding the SAD2hpC RNA hairpin was under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6).
Upon transformation of Strain J with construct pSZ2281, thereby generating Strain K, positive clones were selected on agar plates containing sucrose as a sole carbon source. Individual transformants were clonally purified and propagated under heterotrophic conditions suitable for lipid production as those detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass and analyzed using standard fatty acid methyl ester gas chromatography flame ionization detection methods as described in Example 1 (also see PCT/US2012/023696). The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis UTEX Strain J propagated on glucose as a sole carbon source and three representative isolates of Strain K, propagated on sucrose as a sole carbon source, are presented in Table 21.







TABLE 21







Fatty acid profiles of Prototheca moriformis (UTEX 1435) cells


engineered to express a hairpin RNA construct targeting


stearoyl ACP desaturase gene/gene products.












Area %







Fatty acid
Strain J
Strain K-1
Strain K-2
Strain K-3
Strain K-4















C8:0




0.02


C10:0
0.01
0.00
0.02
0.02
0.04


C12:0
0.03
0.05
0.05
0.05
0.08


C14:0
1.22
0.89
0.87
0.77
1.2


C16:0
26.75
29.23
28.96
27.55
28.06


C18:0
3.06
37.39
36.76
36.41
40.82


C18:1
59.62
23.90
24.76
26.92
22.02


C18:2
7.33
5.44
5.54
5.54
4.53


C18:3




0.14


C20:0




1.43









The data presented in Table 21 show a clear impact of the expression of SAD2 hairpin RNA construct on the C18:0 and C18:1 fatty acid profiles of the transformed organism. The fatty acid profiles of Strain K transformants comprising a SAD2 hairpin RNA construct demonstrated an increase in the percentage of saturated C18:0 fatty acids with a concomitant diminution of unsaturated C18:1 fatty acids. Fatty acid profiles of the untransformed strain comprise about 3% C18:0. Fatty acid profiles of the transformed strains comprise about 37% C18:0. These data illustrate the successful expression and use of polynucleotides enabling expression of a SAD RNA hairpin construct in Prototheca moriformis to alter the percentage of saturated fatty acids in the engineered host microbes, and in particular in increasing the concentration of C18:0 fatty acids and decreasing C18:1 fatty acids in microbial cells.
Also shown in Table 21, strain K4 had a yet further elevated level of stearate. Strain K4 was created by inserting the construct of strains K1-K3 into the SAD2B locus. Thus, by knocking out one copy of the SAD gene and inhibiting the remaining copies at the RNA level, a further reduction in oleic acid and corresponding increase in stearate was obtained. Triglyceride analysis of RBD oil obtained from strain K4 showed about 12% POP, 27% POS and 18% SOS.
Example 36
Engineering Microorganisms for Increased Production of Oleic Acid Through Knockdown of an Endogenous Acyl-ACP Thioesterase
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain J, was transformed independently with each of the constructs pSZ2402-pSZ2407 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Each of the constructs pSZ2402-pSZ2407 included different polynucleotides encoding a hairpin RNA targeted against Prototheca moriformis FATA1 mRNA transcripts to down-regulate the expression of fatty acyl-ACP thioesterase, 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4) to express the protein sequence given in SEQ ID NO: 3 under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. Sequence listing identities for the polynucleotides corresponding to each hairpin are listed in Table 22. The polynucleotide sequence encoding each RNA hairpin was under the control of the C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6).







TABLE 22







Plasmid constructs used to transform Prototheca moriformis


(UTEX 1435) Strain J.











Plasmid construct
Hairpin designation
SEQ ID NO:







pSZ2402
PmFATA-hpB
SEQ ID NO: 40



pSZ2403
PmFATA-hpC
SEQ ID NO: 41



pSZ2404
PmFATA-hpD
SEQ ID NO: 42



pSZ2405
PmFATA-hpE
SEQ ID NO: 43



pSZ2406
PmFATA-hpF
SEQ ID NO: 44



pSZ2407
PmFATA-hpG
SEQ ID NO: 45










Upon independent transformation of Strain J with each of the constructs listed in Table 22, positive clones were selected on agar plates containing sucrose as a sole carbon source. Individual transformants were clonally purified and propagated under heterotrophic conditions suitable for lipid production as those detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass and analyzed using standard fatty acid methyl ester gas chromatography flame ionization detection methods as described in Example 1 (also see PCT/US2012/023696). The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis (UTEX 1435) Strain J propagated on glucose as a sole carbon source and representative isolates of each transformation of Strain J, propagated on sucrose as a sole carbon source, are presented in Table 23.







TABLE 23







Fatty acid profiles of Prototheca moriformis (UTEX 1435) cells


engineered to express hairpin RNA constructs targeting fatty acyl-ACP


thioesterase gene/gene products.









Area % Fatty Acid














Construct
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2

















Strain J
0
0.05
1.32
26.66
3.1
59.07
7.39


untransformed









PmFATA-hpB
0.04
0.07
1.36
24.88
2.24
61.92
6.84



0
0.08
1.33
25.34
2.39
61.72
6.5



0
0.07
1.29
25.44
2.26
61.7
6.69



0
0.06
1.33
25.1
2.37
61.56
6.87


PmFATA-hpC
0
0.08
1.18
22.03
1.71
63.8
8.63



0
0.07
1.21
24.5
2.23
62.32
7.19



0
0.08
1.29
24.93
2.24
62.02
7.01



0.05
0.06
1.29
25.45
2.26
61.81
6.76


PmFATA-hpD
0
0.02
0.68
15.8
1.88
72.64
6.96



0
0.03
0.78
17.56
1.7
71.8
6.03



0
0.03
0.92
19.04
2.03
68.82
7.05



0
0.04
1.27
23.14
2.25
65.27
6.07


PmFATA-hpE
0
0.03
0.79
18.55
2.13
69.66
6.77



0
0.04
1.11
21.01
1.74
65.18
8.55



0
0.03
1.08
21.11
1.54
64.76
8.87



0
0.03
1.17
21.93
1.71
63.89
8.77


PmFATA-hpF
0.03
0.04
0.34
8.6
1.69
78.08
8.87



0
0.03
0.49
10.2
1.52
76.97
8.78



0
0.03
1
20.47
2.22
66.34
7.45



0
0.03
1.03
21.61
1.88
65.39
7.76


PmFATA-hpG
0
0.03
1.03
20.57
2.36
64.73
8.75



0
0.03
1.2
24.39
2.47
61.9
7.49



0
0.04
1.29
24.14
2.29
61.41
8.22









The data presented in Table 23 show a clear impact of the expression of FATA hairpin RNA constructs on the C18:0 and C18:1 fatty acid profiles of the transformed organism. The fatty acid profiles of Strain J transformants comprising a FATA hairpin RNA construct demonstrated an increase in the percentage of C18:1 fatty acids with a concomitant diminution of C16:0 and C18:0 fatty acids. Fatty acid profiles of the untransformed Strain J are about 26.66% C16:0, 3% C18:0, and about 59% C18:1 fatty acids. In contrast, the fatty acid profiles of the transformed strains comprise as low as 8.6% C16:0 and 1.54% C18:0 and greater than 78% C18:1 fatty acids.
These data illustrate the utility and successful use of polynucleotide FATA RNA hairpin constructs in Prototheca moriformis to alter the fatty acids profile of engineered microbes, and in particular in increasing the concentration of C18:1 fatty acids and decreasing C18:0 and C16:0 fatty acids in microbial cells.
Example 37
Engineering Microorganisms for Increased Production of Mid-Chain Fatty Acids Through KASI or KASIV Overexpression
This example describes the use of recombinant polynucleotides that encode KASI or KASIV enzymes to engineer microorganisms in which the fatty acid profiles of the transformed microorganisms have been enriched in lauric acid, C10:0, and total saturated fatty acids.
Each of the constructs pSZD1132, pSZD1133, pSZD1134, or pSZD1201 was used independently to transform Strain B of Example 3, Prototheca moriformis (UTEX 1435) engineered to express a Cuphea wrightii thioesterase (CwTE2), according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Each of the above constructs included different polynucleotides encoding a KASI or KASIV enzyme, 5′ (SEQ ID NO: 13) and 3′ (SEQ ID NO: 14) homologous recombination targeting sequences (flanking the construct) to the pLoop genomic region for integration into the nuclear genome, and a neomycin resistance protein-coding sequence under the control of the C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and the Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This NeoR expression cassette is listed as SEQ ID NO: 15 and served as a selectable marker. Sequence listing identities for the polynucleotides corresponding to each construct are listed in Table 20. The polynucleotide sequence encoding each KAS enzyme was under the control of the P. moriformis UTEX 1435 Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). The protein coding regions of the KAS enzymes and neomycin resistance gene were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Upon transformation of individual plasmids into Strain B, positive clones were selected on agar plates comprising G418. Individual transformants were clonally purified and grown on sucrose as a sole carbon source at pH 7.0 under conditions suitable for lipid production as detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass from each transformant and fatty acid profiles from these samples were analyzed using standard fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. The fatty acid profiles (expressed as Area % of total fatty acids) of Strain B and four positive transformants of each of pSZ2046 (Strains M-P, 1-4) are presented in Table 24.







TABLE 24







Plasmid constructs used to transform Prototheca moriformis


(UTEX 1435) Strain B.










Plasmid
KASI/KASIV




construct
source
Transit peptide
SEQ ID NO:





pSZD1134
Cuphea wrightii
Native
SEQ ID NO: 46



GenBank Accession



No. U67317


pSZD1201
Cuphea wrightii
PmSAD
SEQ ID NO: 47


pSZD1132
Cuphea pulcherrima
Native
SEQ ID NO: 48



GenBank Accession



No. AAC68860


pSZD1133
Cuphea hookeriana
Native
SEQ ID NO: 49
















TABLE 25







Fatty acid profiles of Prototheca moriformis (UTEX 1435) Strain B


engineered for increased C10, lauric acid, and total saturated fatty acids.









Fatty Acid (Area %)

















Plasmid








C10-
% Saturates/


construct(s)
No.
C10
C12
C14
C16
C18:0
C18:1
C18:2
C12
Total




















pSZ1283

7.89
35.49
16.58
11.5
1.09
19.64
6.49
43.38
72.55


pSZ1283,
1
14.94
43.97
12.19
7.56
0.72
14.11
5.31
58.91
79.38


pSZD1134












pSZ1283,
2
10.27
39.61
15.35
9.61
0.94
17.1
5.88
49.88
75.78


pSZD1134












pSZ1283,
3
11.69
41.83
15.21
8.77
0.83
15.04
5.40
53.52
78.33


pSZD1134












D1134-20
4
10.76
40.77
15.32
9.19
0.88
16.06
5.76
51.53
76.92


pSZ1283,
1
10.77
40.31
15.21
9.43
0.88
16.18
5.97
51.08
76.6


pSZD1132












pSZ1283,
2
9.19
37.03
15.02
10.52
1.00
19.63
6.29
46.22
72.76


pSZD1132












pSZ1283,
3
8.97
36.09
15.01
10.77
1.05
20.38
6.39
45.06
71.89


pSZD1132












pSZ1283,
4
9.51
38.12
14.96
9.96
0.94
18.93
6.32
47.63
73.49


pSZD1132












pSZ1283,
1
13.06
46.21
9.84
7.12
0.75
16.7
5.22
59.27
76.98


pSZD1201












pSZ1283,
2
11.02
43.91
13.01
7.78
0.86
16.53
5.77
54.93
76.58


pSZD1201












pSZ1283,
3
11.59
45.14
12.41
7.61
0.82
15.72
5.65
56.73
77.57


pSZD1201












pSZ1283,
4
10.66
41.32
13.74
8.75
0.68
18.64
5.21
51.98
75.15


pSZD1201












pSZ1283,
1
6.90
36.08
15.15
11.02
1.00
21.74
6.77
42.98
70.15


pSZD1133












pSZ1283,
2
7.01
35.88
15.01
10.75
1.07
22.02
6.93
42.89
69.72


pSZD1133












pSZ1283,
3
10.65
41.94
12.38
8.48
0.85
18.28
6.15
52.59
74.3


pSZD1133












pSZ1283,
4
10.23
41.88
12.58
8.52
0.82
18.48
6.22
52.11
74.03


pSZD1133









The data presented in Table 25 show a clear impact of the exogenous expression of KASI and KASIV enzymes on the C10:0 and C12 fatty acid profiles of the transformed organism. The fatty acid profiles of Strain B, expressing the Cuphea wrightii thioesterase alone, comprised about 8% C10:0 and about 35.5% C12:0, with saturated fatty acids accounting for 72.55% of total fatty acids. In contrast, transformants of Strain B engineered to additionally express a Cuphea wrightii KASI with a P. moriformis stearoyl ACP desaturase transit peptide were characterized by a fatty acid profile of about 13% C10:0 and about 46% C12:0. Saturated fatty acids accounted for as high as 77% in transformants of Strain B co-expressing the C. wrightii KASI fusion protein. Similarly, transformants of Strain B engineered to express the C. wrightii KASI with the enzyme's native transit peptide were characterized by a fatty acid profile of about 15% C10, about 44% C12, and about 79% saturated fatty acids. The fatty acid profiles or many transformants of Strain B expressing either Cuphea pulcherrima KASIV or Cuphea hookeriana KASIV also displayed elevated C10% and C12% levels, compared to the fatty acid profile of Strain B itself.
These data demonstrate the utility and effectiveness of polynucleotides enabling expression of KASI and KASIV constructs in Prototheca moriformis (UTEX 1435) to alter the percentage of saturated fatty acids in the engineered host microbes, and in particular in increasing the concentration of C10:0 and C12:0 fatty acids in microbial cells.
Example 38
Engineering Microorganisms for Increased Production of Mid-Chain Fatty Acids Through KASI Knockout
This example describes the use of recombinant polynucleotides that disrupt different KASI alleles to engineer microorganisms in which the fatty acid profiles of the transformed microorganisms have been enriched in C10:0 and midchain fatty acids.
Constructs pSZ2302 and pSZ2304 were used to independently transform Strain B of Example 3, Prototheca moriformis (UTEX 1435) engineered to express a Cuphea wrightii thioesterase (CwTE2), according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. pSZ2302 included 5′ (SEQ ID NO: 50) and 3′ (SEQ ID NO: 51) homologous recombination targeting sequences (flanking the construct) to the KASI allele 1 genomic region for integration into the P. moriformis nuclear genome, an A. thaliana THIC protein coding region under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). pSZ2304 included 5′ (SEQ ID NO: 52) and 3′ (SEQ ID NO: 53) homologous recombination targeting sequences (flanking the construct) to the KASI allele 2 genomic region for integration into the P. moriformis nuclear genome, an A. thaliana THIC protein coding region under the control of the C. protothecoides actin promoter/5′UTR (SEQ ID NO: 22) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This AtTHIC expression cassette is listed as SEQ ID NO: 23 and served as a selection marker. The protein coding region of AtTHIC was codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Upon independent transformation pSZ2302 and pSZ2304 into Strain B, thereby generating Strain Q and R, positive clones were selected on agar plates comprising thiamine. Individual transformants were clonally purified and cultivated on sucrose as a sole carbon source at pH 5.0 or pH 7.0 under heterotrophic conditions suitable for lipid production as detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass from each transformant and fatty acid profiles from these samples were analyzed using fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. The fatty acid profiles (expressed as Area % of total fatty acids) of Strain B and positive pSZ2302 (Strain Q, 1-5) and pSZ2304 (Strain R, 1-5) transformants are presented in Tables 26 and 27.







TABLE 26







Fatty acid profiles of Prototheca moriformis (UTEX 1435) Strains B, Q,


and R engineered for increased midchain fatty acids, cultured at pH 5.0.










Transformation
Fatty Acid (Area %)
















Strain
plasmid(s)
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2
C10-C14



















UTEX 1435
None
0.00
0.04
1.28
26.67
3.05
59.96
7.19
1.32


Strain B
pSZ1283
0.01
0.09
1.09
21.60
2.21
65.15
7.94
1.19


Strain Q-1
pSZ1283,
0.08
1.21
7.52
38.71
1.38
38.32
8.75
8.81



pSZ2302










Strain Q-2
pSZ1283,
0.15
1.36
7.51
38.23
1.33
38.27
8.94
9.02



pSZ2302










Strain Q-3
pSZ1283,
0.16
1.43
7.49
38.88
1.30
37.58
8.73
9.08



pSZ2302










Strain Q-4
pSZ1283,
0.00
1.71
7.42
37.67
1.43
37.26
10.38
9.13



pSZ2302










Strain Q-5
pSZ1283,
0.13
1.21
7.36
38.81
1.31
38.07
8.71
8.7



pSZ2302










Strain R-1
pSZ1283,
0.19
1.78
8.47
40.11
1.34
33.46
9.98
10.44



pSZ2304










Strain R-2
pSZ1283,
0.90
8.00
7.78
28.96
1.15
30.26
17.14
16.68



pSZ2304










Strain R-3
pSZ1283,
0.26
3.58
7.77
34.98
1.56
32.86
14.60
11.61



pSZ2304










Strain R-4
pSZ1283,
1.64
13.50
7.61
21.38
0.90
36.13
14.73
22.75



pSZ2304










Strain R-5
pSZ1283,
1.03
9.63
7.56
25.61
1.00
31.70
18.23
18.22



pSZ2304
















TABLE 27







Fatty acid profiles of Prototheca moriformis (UTEX 1435), Strains B, Q,


and R engineered for increased midchain fatty acids, cultured at pH 7.0.










Transformation
Fatty Acid (Area %)
















Strain
plasmid(s)
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2
C10-C14



















UTEX
None
0.01
0.04
1.34
27.94
3.24
57.46
7.88
1.39


1435











Strain B
pSZ1283
4.72
29.57
15.56
12.63
1.20
27.65
7.39
49.85


Strain Q-1
pSZ1283, pSZ2302
16.00
50.61
9.52
5.33
0.54
11.79
5.28
76.13


Strain Q-2
pSZ1283, pSZ2302
16.32
49.79
9.82
5.52
0.54
12.28
4.87
75.93


Strain Q-3
pSZ1283, pSZ2302
15.08
47.58
10.23
5.93
0.56
15.12
4.50
72.89


Strain Q-4
pSZ1283, pSZ2302
14.27
47.30
10.44
6.17
0.56
15.50
4.59
72.01


Strain Q-5
pSZ1283, pSZ2302
14.75
47.28
10.32
6.04
0.59
15.50
4.65
72.35


Strain R-1
pSZ1283, pSZ2304
21.25
55.42
7.97
3.65
0.00
5.46
5.66
84.64


Strain R-2
pSZ1283, pSZ2304
13.00
55.05
10.88
5.78
0.28
7.90
6.29
78.93


Strain R-3
pSZ1283, pSZ2304
12.89
53.15
11.11
6.13
0.00
9.87
6.13
77.15


Strain R-4
pSZ1283, pSZ2304
12.80
51.64
13.86
6.69
0.00
7.51
6.70
78.3


Strain R-5
pSZ1283, pSZ2304
16.61
51.42
9.84
5.27
0.33
11.15
4.79
77.87









The data presented in Tables 26 and 27 show a clear impact of disruption of different KASI alleles on the fatty acid profiles of the transformed organisms. When cultivated at pH 5.0, the fatty acid profiles of Prototheca moriformis (UTEX 1435) and Prototheca moriformis (UTEX 1435) Strain B, expressing a Cuphea wrightii FATB2 thioesterase under control of a pH regulatable promoter were very similar. These profiles were characterized by about 1% C14:0, about 21-26% C16:0, about 2-3% C18:0, about 60-65% C18:1, about 7% C18:2, with C10-C14 fatty acids comprising about 1.19-1.3% of total fatty acids. In contrast, when cultivated at pH 5.0, Strain B further engineered to disrupt KASI allele 1 (Strain Q) or KASI allele 2 (Strain R) demonstrated altered fatty acid profiles that were characterized by increased levels of C12, increased levels of C14, decreased levels of C18, and decreased levels of C18:1 fatty acids compared to Strain B or UTEX 1435. The fatty acid profiles of isolates of Strains Q and R differed in that Strain R (allele 2 knockout) isolates had generally greater C12s and lower C16s and C18:1s than Strain Q (allele 1 knockout).
When cultivated at pH 7.0, the fatty acid profile of Prototheca moriformis (UTEX 1435) is distinct from that Prototheca moriformis (UTEX 1435) Strain B expressing a Cuphea wrightii FATB2 thioesterase under control of a pH regulatable promoter. When cultured at pH 7.0, Strain B was characterized by a fatty acid profile elevated in C10, C12, and C14 fatty acids (these comprised about 50% of the total fatty acids). When cultured at pH 7.0, Strain Q and Strain R demonstrated fatty acid profiles with still further increases in C10, C12, and C14 fatty acids and still further decreases in C18:0 and C18:1 fatty acids relative to that of Strain B. Again, differences in fatty acid profiles between Strain Q and R were observed with the profile of Strain R comprising greater percentage levels of C12 and lower levels of C18:1 than that of Strain Q.
These data illustrate the successful expression and use of polynucleotides enabling expression of KASI and KASIV constructs in Prototheca moriformis to alter the percentage of saturated fatty acids in the engineered host microbes, and in particular in increasing the concentration of C10:0 and C12:0 fatty acids and decreasing the concentration of C18:0 and C18:1 fatty acids in microbial cells. In addition, the data here indicate the different KASI alleles can be disrupted to result in altered fatty acid profiles of the transformed organisms.
Example 39
Engineering Microorganisms for Increased Production of Mid-Chain Fatty Acids Through KASI Knockdown
This example describes the use of recombinant polynucleotides that encode RNA hairpins to attenuate a KASI enzyme to engineer a microorganism in which the fatty acid profile of the transformed microorganism has been enriched in midchain fatty acids.
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain S, was transformed independently with each of the constructs pSZ2482-pSZ2485 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Each of the constructs pSZ2482-pSZ2485 included different polynucleotides encoding hairpin RNAs targeted against Prototheca moriformis (UTEX 1435) KASI mRNA transcripts to down-regulate the expression of fatty acyl-ACP thioesterase, 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4) to express the protein sequence given in SEQ ID NO: 3 under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. Sequence listing identities for the polynucleotides corresponding to each KASI hairpin are listed in Table 28. The polynucleotide sequence encoding each RNA hairpin was under the control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). The protein coding region of the suc2 expression cassette was codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.







TABLE 28







Plasmid constructs used to transform Prototheca moriformis


(UTEX 1435) Strain S.











Transformation





construct
Hairpin
SEQ ID NO:







pSZ2482
KASI hairpin B
SEQ ID NO: 54



pSZ2483
KASI hairpin C
SEQ ID NO: 55



pSZ2484
KASI hairpin D
SEQ ID NO: 56



pSZ2485
KASI hairpin E
SEQ ID NO: 57










Upon independent transformation of Strain S with each of the constructs listed in Table 28, positive clones were selected on agar plates containing sucrose as a sole carbon source. Individual transformants were clonally purified and propagated under heterotrophic conditions suitable for lipid production as those detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass and analyzed using fatty acid methyl ester gas chromatography flame ionization detection methods as described in Example 1 (also see PCT/US2012/023696). The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis UTEX 1435 propagated on glucose as a sole carbon source and four representative isolates of each transformation of Strain S, propagated on sucrose as a sole carbon source, are presented in Table 29.







TABLE 29







Fatty acid profiles of Prototheca moriformis (UTEX 1435) cells


engineered to express hairpin RNA constructs targeting KASI gene/gene products.













Fatty Acid (Area %)

















Strain
Plasmid
Number
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2
C18:3




















UTEX 1435
none
1
0.00
0.04
1.45
27.97
3.18
58.35
6.78
0.60


Strain S
pSZ2482
1
0.19
0.74
8.47
38.30 
2.15
36.24
9.45
1.42




2
0.07
0.25
4.16
32.46
2.62
49.57
7.73
0.82




3
0.03
0.10
2.68
27.48
2.65
56.40
8.14
0.55




4
0.03
0.10
2.60
27.44
2.01
55.54
9.15
0.78



pSZ2483
1
0.00
0.06
1.94
30.58
1.55
53.26 
9.31
0.76




2
0.20
0.05
1.76
28.01
2.31
56.61
8.70
0.60




3
0.00
0.06
1.60
24.38
2.65
58.25
9.93
1.15




4
0.00
0.04
1.56
26.65
2.96
60.06
6.92
0.52



pSZ2484
1
0.72
3.71
19.15
38.03
1.68
14.22
15.00
4.21




2
0.66
2.76
16.34
38.19
1.78
18.52
14.91
3.38




3
0.69
2.96
16.20
37.28
1.77
19.05
15.26
3.48




4
0.18
0.70
8.61
36.80
2.35
36.22
10.89
1.10



pSZ2485
1
0.00
0.04
1.41
25.34
3.16
60.12
7.78
0.48




2
0.03
0.04
1.41
23.85
2.19
61.23
8.75
0.67




3
0.00
0.04
1.41
24.41
2.23
60.64
8.69
0.67




4
0.00
0.04
1.41
24.51
2.16
60.85
8.91
0.66









The data presented in Table 29 show a clear impact of the expression of KAS hairpin RNA constructs on the fatty acid profiles of the transformed organisms. The fatty acid profiles of Strain S transformants comprising either pSZ2482 or pSZ2484 KASI hairpin RNA construct demonstrated an increase in the percentage of C10, C12, C14, and C16 fatty acids with a concomitant diminution of C18:0 and C18:1 fatty acids relative to the fatty acid profile of UTEX 1435.
These data illustrate the utility and successful use of polynucleotide KASI RNA hairpin constructs in Prototheca moriformis (UTEX 1435) to alter the fatty acids profile of engineered microbes, and in particular in increasing the concentration of midchain fatty acids and decreasing C18:0 and C18:1 fatty acids in microbial cells.
Example 40
Engineering Microorganisms for Increased Production of Stearic Acid Through Fatty Acid Elongase Overexpression
This example describes the use of recombinant polynucleotides that encode fatty acid elongases to engineer a microorganism in which the fatty acid profile of the transformed microorganism has been enriched in stearic acid, arachidic acid, and docosadienoic acid.
A classically mutagenized strain of Prototheca moriformis (UTEX 1435), Strain J, was transformed independently with each of the constructs pSZ2323, pSZ2324, or pSZ2328 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Each of the constructs included a protein coding region to overexpress an elongase, 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4) to express the protein sequence given in SEQ ID NO: 3 under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. Sequence listing identities for the polynucleotides corresponding to each elongase are listed in Table 30. The polynucleotide sequence encoding each elongase was under control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). The protein coding regions of the exogenous elongases and the suc2 expression cassette were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.







TABLE 30







Plasmid constructs used to transform Prototheca moriformis


(UTEX 1435) Strain J.










Plasmid

GenBank



construct
Elongase source
Accession No.
SEQ ID NO:





pSZ2328
Marchantia polymorpha
AAP74370
58, 59


pSZ2324
Trypanosoma brucei
AAX70673
60, 61


pSZ2323
Saccharomyces cerevisiae
P39540
62, 63









Upon independent transformation of Strain J with the constructs listed in Table 30, positive clones were selected on agar plates containing sucrose as a sole carbon source. Individual transformants were clonally purified and propagated under heterotrophic conditions suitable for lipid production as those detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass and analyzed using fatty acid methyl ester gas chromatography flame ionization detection methods as described in Example 1 (also see PCT/US2012/023696). The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis UTEX 1435 Strain J propagated on glucose as a sole carbon source and three representative isolates of each transformation of Strain J, propagated on sucrose as a sole carbon source are presented in Table 31.







TABLE 31







Fatty acid profiles of Prototheca moriformis (UTEX 1435) Strain J cells


engineered to overexpress elongases.









Plasmid

Fatty Acid Area %

















construct
No
C14:0
C16:0
C16:1
C18:0
C18:1
C18:2
C18:3a
C20:0
C22:2n6




















None
1
1.39
27.42
0.77
3.33
57.46
8.05
0.61
0.30
0.03


pSZ2328
1
1.25
19.23
0.85
8.26
57.54
9.34
0.79
0.73
0.94


pSZ2328
2
1.22
17.76
0.69
7.86
60.56
9.38
0.59
0.6
0.47


pSZ2328
3
1.26
18.37
0.92
7.83
58.77
10.01
0.72
0.64
0.52


pSZ2324
1
1.51
22.97
1.09
8.71
53.01
9.63
0.65
0.68
0.55


pSZ2324
2
1.29
20.6
0.92
7.53
56.97
9.92
0.73
0.64
0.43


pSZ2324
3
1.28
20.59
0.93
7.33
57.52
9.68
0.65
0.58
0.42


pSZ2323
1
1.65
27.27
0.67
3.56
56.68
8.72
0.33
0.36
0.00


pSZ2323
2
1.56
28.44
0.74
3.36
55.22
9.07
0.46
0.39
0.03


pSZ2323
3
1.64
28.7
0.75
3.34
55.29
8.59
0.49
0.36
0.02









The data presented in Table 31 show a clear impact of the expression of Marchantia polymorpha and Trypanosoma brucei enzymes on the C14, C16, C18:0, C20:0, and C22:2n6 fatty acid profiles of the transformed organisms. The fatty acid profile of untransformed Strain J was about 27.42% C16:0, about 3% C18:0, about 57.5% C18:1, about 0.3% C20:0 and about 0.03% C22:2n6 fatty acids. In contrast to that of Strain J, the fatty acid profiles of Strain J transformed with different plasmid constructs to express elongases comprised lower percentage levels of C16 and higher percentage levels of C18:0, C20:0, and C22:2n6 fatty acids. The result of overexpression of Marchantia polymorpha elongase was about a 2.5 fold increase in percentage levels of C18:0 fatty acids, a 2 fold increase in percentage levels of C20:0 fatty acids, and about a 15 to 30 fold increase in percentage levels of C22:2n6 fatty acids relative to the fatty acid profile of Strain J.
These data illustrate the successful use of polynucleotides encoding elongases for expression in Prototheca moriformis (UTEX 1435) to alter the fatty acid profile of engineered microbes, and in particular in increasing the concentration of C18:0, C20:0, and C22:2n6 fatty acids and decreasing C16:0 fatty acids in recombinant microbial cells.
Example 41
Engineering Microorganisms for Increased Production of Stearic Acid Through Acyl-ACP Thioesterase Overexpression
This example describes the use of recombinant polynucleotides that encode different C18:0-preferring acyl-ACP thioesterases to engineer microorganisms in which the fatty acid profiles of the transformed microorganisms have been enriched in stearic acid.
Classically mutagenized strains of Prototheca moriformis (UTEX 1435), Strain J or Strain A, were transformed independently with the constructs listed in Table 32 according to biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Each of the constructs included a protein coding region to overexpress a fatty acyl-ACP thioesterase with a C-terminal 3×FLAG® epitope tag, 5′ (SEQ ID NO: 1) and 3′ (SEQ ID NO: 2) homologous recombination targeting sequences (flanking the construct) to the 6S genomic region for integration into the nuclear genome, and a S. cerevisiae suc2 sucrose invertase coding region (SEQ ID NO: 4) to express the protein sequence given in SEQ ID NO: 3 under the control of C. reinhardtii β-tubulin promoter/5′UTR (SEQ ID NO: 5) and Chlorella vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). This S. cerevisiae suc2 expression cassette is listed as SEQ ID NO: 7 and served as a selectable marker. Sequence listing identities for the polynucleotides corresponding to each thioesterase are listed in Table 32. The polynucleotide sequence encoding each thioesterase was under control of the P. moriformis Amt03 promoter/5′UTR (SEQ ID NO: 8) and C. vulgaris nitrate reductase 3′ UTR (SEQ ID NO: 6). The protein coding regions of the exogenous thioesterases and the suc2 expression cassette were codon optimized to reflect the codon bias inherent in P. moriformis UTEX 1435 nuclear genes as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.







TABLE 32







Plasmid constructs used to transform Prototheca moriformis


(UTEX 1435) Strain A or Strain J.












Acyl-ACP






Thioesterase,
Acyl-ACP
Transit


Plasmid
GenBank
Thioesterase
Peptide
SEQ ID


construct
Accession No.
source
source
NO:





pSZD581
FATA, CAA52070
Brassica napus
native
64, 65


pSZD643
FATA, CAA52070
Brassica napus
UTEX 250
66, 67





SAD


pSZD645
FATA, AAA33019
C. tinctorius
UTEX 250
68, 69





SAD


pSZD644
FATA, ABS30422
Ricinis
native
70, 71




communis


pSZD1323
FATA, AAB51523
G. mangostana
native
72, 73


pSZD1320
FATA
Theobroma
native
74, 75




cacao









Upon independent transformation of Strain A or J with the constructs listed in Table 32, positive clones were selected on agar plates containing sucrose as a sole carbon source. Individual transformants were clonally purified and propagated under heterotrophic conditions suitable for lipid production as those detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples were prepared from dried biomass and analyzed using fatty acid methyl ester gas chromatography flame ionization detection methods as described in Example 1 (also see PCT/US2012/023696). The fatty acid profiles (expressed as Area % of total fatty acids) of P. moriformis UTEX 1435 Strain J propagated on glucose as a sole carbon source and representative isolates of each transformation of Strain J, propagated on sucrose as a sole carbon source are presented in Table 33.







TABLE 33







Fatty acid profiles of Prototheca moriformis (UTEX 1435) Strain J cells


engineered to overexpress exogenous acyl-ACP thioesterase enzymes.











Plasmid

Fatty Acid Area %















Strain
construct
No.
C14:0
C16:0
C18:0
C18:1
C18:2
C18:3a


















A
None
1
1.08
25.48
3.23
59.70
8.25
0.70


J
None
1
1.41
27.33
3.38
57.07
8.15
0.64


A
pSZD581
1
1.02
26.60
14.47
44.80
10.05
0.65




2
1.08
28.24
13.57
43.89
10.07
0.68




3
0.97
24.70
9.13
50.85
11.27
0.82


A
pSZD643
1
1.39
26.97
16.21
44.10
8.43
0.83




2
1.37
27.91
11.15
48.31
8.40
0.78


A
pSZD645
1
0.90
23.39
8.35
50.69
13.34
0.96


A
pSZD644
1
1.67
19.70
4.40
59.15
12.32
1.01


J
pSZD1323
1
1.33
23.26
9.28
53.42
10.35
0.69




2
1.47
26.84
7.36
52.78
9.29
0.64




3
1.43
26.31
6.05
54.45
9.37
0.66


J
pSZD1320
1
1.30
24.76
3.84
60.90
6.96
0.55




2
1.36
26.30
3.27
58.19
8.66
0.48




3
1.39
25.51
3.18
58.78
8.85
0.45









The data presented in Table 33 show a clear impact of the expression of exogenous acyl-ACP enzymes on the fatty acid profiles of the transformed microorganisms. The fatty acid profiles of untransformed Strain A and J were about 25% C16:0, about 3.3% C18:0, about 57 to 60% C18:1. In contrast, the fatty acid profiles of Strain A transformed with different plasmid constructs to express acyl-ACP enzymes comprised greater percentage levels of C18:0 and lower percentage levels of C18:1 fatty acids than that of Strain A. Expression of FATA enzymes from B. napus, C. tinctorius, R. communis and G. mangostana in Strain A or J enabled the accumulation of stearate levels in the transformed organisms. The result of overexpression of a Brassica napus acyl-ACP thioesterase was about a 2 to 5 fold increase in the percentage levels of C18:0 fatty acids of the fatty acid profile of the transformed organisms relative to the fatty acid profile of Strain A. Fatty acid profiles of cells engineered to overexpress a G. mangostana acyl-ACP FATA thioesterase with a C. protothecoides SAD1 transit peptide were characterized by about a 2 to 3 fold increase in the percentage levels of C18:0 fatty acids of the fatty acid profile of the transformed organisms relative to the fatty acid profile of Strain J.
These data illustrate the utility and effective use of polynucleotides encoding fatty acyl-ACP thioesterases for expression in Prototheca moriformis (UTEX 1435) to alter the fatty acid profile of engineered microbes, and in particular in increasing the concentration of C18:0 and decreasing C18:1 fatty acids in recombinant microbial cells.
Example 42
Engineering Microorganisms for Increased Production of Erucic Acid Through Elongase or Beta-Ketoacyl-CoA Synthase Overexpression
In an embodiment of the present invention, a recombinant polynucleotide transformation vector operable to express an exogenous elongase or beta-ketoacyl-CoA synthase in an optionally plastidic oleaginous microbe is constructed and employed to transform Prototheca moriformis (UTEX 1435) according to the biolistic transformation methods as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696 to obtain a cell increased for production of erucic acid. The transformation vector includes a protein coding region to overexpress an elongase or beta-ketoacyl-CoA synthase such as those listed in Table 5, promoter and 3′UTR control sequences to regulate expression of the exogenous gene, 5′ and 3′ homologous recombination targeting sequences targeting the recombinant polynucleotides for integration into the P. moriformis (UTEX 1435) nuclear genome, and nucleotides operable to express a selectable marker. The protein-coding sequences of the transformation vector are codon-optimized for expression in P. moriformis (UTEX 1435) as described in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Recombinant polynucleotides encoding promoters, 3′ UTRs, and selectable markers operable for expression in P. moriformis (UTEX 1435) are disclosed herein and in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696.
Upon transformation of the transformation vector into P. moriformis (UTEX 1435) or a classically-mutagenized strain of P. moriformis (UTEX 1435), positive clones are selected on agar plates. Individual transformants are clonally purified and cultivated under heterotrophic conditions suitable for lipid production as detailed in PCT/US2009/066141, PCT/US2009/066142, PCT/US2011/038463, PCT/US2011/038464, and PCT/US2012/023696. Lipid samples are prepared from dried biomass from each transformant and fatty acid profiles from these samples are analyzed using fatty acid methyl ester gas chromatography flame ionization (FAME GC/FID) detection methods as described in Example 1. As a result of these manipulations, the cell may exhibit an increase in erucic acid of at least 5, 10, 15, or 20 fold.
Example 43
Generation of Capric, Lauric, and Myristic Acid Rich Oils in Strain UTEX1435 by the Expression of Cuphea PSR23 LPAATs
We tested the effect of expression of two 1-acyl-sn-glycerol-3-phosphate acyltransferases (LPAATs) in a previously described P. moriformis (UTEX 1435) transgenic strain, expressing the acyl ACP thioesterase (FATB2) from Cuphea wrightii. The LPAAT2 and LPAAT3 genes from Cuphea PSR23 (CuPSR23) were identified by analysis of a combination of CuPSR23 genomic sequences and transcriptomic sequences derived from seed RNAs. The two LPAATs have not been previously described. The genes were codon optimized to reflect UTEX 1435 codon usage. Transformations, cell culture, lipid production and fatty acid analysis were all carried out as previously described.
Increased Capric, Lauric, and Myristic Accumulation in Strain B by the Expression of the Cuphea PSR23 1-acyl-sn-glycerol-3-phosphate acyltransferases (LPAAT2 and LPAAT3) [pSZ2299 and pSZ2300, respectively]:
In this example, transgenic strains were generated via transformation of strain B with the constructs pSZ2299 or pSZ2300, encoding CuPSR23 LPAAT2 and LPAAT3, respectively. The transgenic strains were selected for resistance to the antibiotic G418. Construct pSZ2299 can be written as pLOOP5′::CrTUB2:NeoR:CvNR::PmAMT3:CuPSR23 LPAAT2-1:CvNR::pLOOP3′. Construct pSZ2300 can be written as pLOOP5′::CrTUB2:NeoR:CvNR::PmAMT3:CuPSR23 LPAAT3-1:CvNR::pLOOP3′. The sequence of the transforming DNA (pSZ2299 and pSZ2300) is provided below. The relevant restriction sites in the construct from 5′-3′, BspQI, KpnI, XbaI, Mfe I, BamHI, EcoRI, SpeI, XhoI, SacI, BspQI, respectively, are indicated in lowercase, bold, and underlined. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences at the 5′ and 3′ end of the construct represent genomic DNA from UTEX 1435 that target integration to the pLoop locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the selection cassette has the C. reinhardtii β-tubulin promoter driving expression of the NeoR gene (conferring resistance to G418) and the Chlorella vulgaris Nitrate Reductase (NR) gene 3′ UTR. The promoter is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for NeoR are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR is indicated by lowercase underlined text. The spacer region between the two cassettes is indicated by upper case text. The second cassette containing the codon optimized LPAAT2 gene (pSZ2299) or LPAAT3 gene (pSZ2300) from Cuphea PSR23 is driven by the Prototheca moriformis endogenous AMT3 promoter, and has the same Chlorella vulgaris Nitrate Reductase (NR) gene 3′ UTR. In this cassette, the AMT3 promoter in indicated by lowercase, boxed text. The initiator ATG and terminator TGA for the CuPSR23 LPAAT2 and LPAAT3 genes are indicated in uppercase italics, while the coding regions are indicated by lowercase italics. The 3′ UTR is indicated by lowercase underlined text. The final constructs were sequenced to ensure correct reading frames and targeting sequences.
pSZ2299 Transforming Construct:












(SEQ ID NO: 90)


gctcttccgctaacggaggtctgtcaccaaatggaccccgtctattgcgggaaaccacggcgatggcacgtttcaaaacttgat


 


gaaatacaatattcagtatgtcgcgggcggcgacggcggggagctgatgtcgcgctgggtattgcttaatcgccagcttcgcc


 


cccgtcttggcgcgaggcgtgaacaagccgaccgatgtgcacgagcaaatcctgacactagaagggctgactcgcccggca


 


cggctgaattacacaggcttgcaaaaataccagaatttgcacgcaccgtattcgcggtattttgttggacagtgaatagcgatg


 


cggcaatggcttgtggcgttagaaggtgcgacgaaggtggtgccaccactgtgccagccagtcctggcggctcccagggccc


 


cgatcaagagccaggacatccaaactacccacagcatcaacgccccggcctatactcgaaccccacttgcactctgcaatggt


 
































cctgggtggagcgcctgttcggctacgactgggcccagcagaccatcggctgctccgacgccgccgtgttccgcctgtccgccca


 


gggccgccccgtgctgttcgtgaagaccgacctgtccggcgccctgaacgagctgcaggacgaggccgcccgcctgtcctggct


 


ggccaccaccggcgtgccctgcgccgccgtgctggacgtggtgaccgaggccggccgcgactggctgctgctgggcgaggtgc


 


ccggccaggacctgctgtcctcccacctggcccccgccgagaaggtgtccatcatggccgacgccatgcgccgcctgcacaccc


 


tggaccccgccacctgccccttcgaccaccaggccaagcaccgcatcgagcgcgcccgcacccgcatggaggccggcctggtg


 


gaccaggacgacctggacgaggagcaccagggcctggcccccgccgagctgttcgcccgcctgaaggcccgcatgcccgacg


 


gcgaggacctggtggtgacccacggcgacgcctgcctgcccaacatcatggtggagaacggccgcttctccggcttcatcgactg


 


cggccgcctgggcgtggccgaccgctaccaggacatcgccctggccacccgcgacatcgccgaggagctgggcggcgagtgg


 


gccgaccgcttcctggtgctgtacggcatcgccgcccccgactcccagcgcatcgccttctaccgcctgctggacgagttcttcTG


 


Acaattggcagcagcagctcggatagtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttga


 


cctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctattt


 


gcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcg


 


ctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactg


 


caatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatccCGCGTCTCGAACAGAGCGCGCA


 


GAGGAACGCTGAAGGTCTCGCCTCTGTCGCACCTCAGCGCGGCATACACCACAA


 


TAACCACCTGACGAATGCGCTTGGTTCTTCGTCCATTAGCGAAGCGTCCGGTTCA


 


CACACGTGCCACGTTGGCGAGGTGGCAGGTGACAATGATCGGTGGAGCTGATGG


 







































































 








ctagtATGgcgatcgcggccgcggcggtgatcttcctgttcggcctgatcttcttcgcctccggcctgatcatcaacctgttccagg


 


cgctgtgcttcgtcctgatccgccccctgtccaagaacgcctaccgccgcatcaaccgcgtgttcgcggagctgctgctgtccgagc


 


tgctgtgcctgttcgactggtgggcgggcgcgaagctgaagctgttcaccgaccccgagacgttccgcctgatgggcaaggagca


 


cgccctggtcatcatcaaccacatgaccgagctggactggatggtgggctgggtgatgggccagcacttcggctgcctgggctcc


 


atcatctccgtcgccaagaagtccacgaagttcctgcccgtgctgggctggtccatgtggttctccgagtacctgtacctggagcgct


 


cctgggccaaggacaagtccaccctgaagtcccacatcgagcgcctgatcgactaccccctgcccttctggctggtcatcttcgtcg


 


agggcacccgcttcacgcgcacgaagctgctggcggcccagcagtacgcggtctcctccggcctgcccgtcccccgcaacgtcc


 


tgatcccccgcacgaagggcttcgtctcctgcgtgtcccacatgcgctccttcgtccccgcggtgtacgacgtcacggtggcgttccc


 

































pSZ2300 Transforming Construct:








(SEQ ID NO: 91)



gctcttccgctaacggaggtctgtcaccaaatggaccccgtctattgcgggaaaccacggcgatggcacgtttcaaaacttgat



 


gaaatacaatattcagtatgtcgcgggcggcgacggcggggagctgatgtcgcgctgggtattgcttaatcgccagcttcgcc


 


cccgtcttggcgcgaggcgtgaacaagccgaccgatgtgcacgagcaaatcctgacactagaagggctgactcgcccggca


 


cggctgaattacacaggcttgcaaaaataccagaatttgcacgcaccgtattcgcggtattttgttggacagtgaatagcgatg


 


cggcaatggcttgtggcgttagaaggtgcgacgaaggtggtgccaccactgtgccagccagtcctggcggctcccagggccc


 


cgatcaagagccaggacatccaaactacccacagcatcaacgccccggcctatactcgaaccccacttgcactctgcaatggt


 
































cctgggtggagcgcctgttcggctacgactgggcccagcagaccatcggctgctccgacgccgccgtgttccgcctgtccgccca


 


gggccgccccgtgctgacgtgaagaccgacctgtccggcgccctgaacgagctgcaggacgaggccgcccgcctgtcctggct


 


ggccaccaccggcgtgccctgcgccgccgtgctggacgtggtgaccgaggccggccgcgactggctgctgctgggcgaggtgc


 


ccggccaggacctgctgtcctcccacctggcccccgccgagaaggtgtccatcatggccgacgccatgcgccgcctgcacaccc


 


tggaccccgccacctgccccacgaccaccaggccaagcaccgcatcgagcgcgcccgcacccgcatggaggccggcctggtg


 


gaccaggacgacctggacgaggagcaccagggcctggcccccgccgagctgttcgcccgcctgaaggcccgcatgcccgacg


 


gcgaggacctggtggtgacccacggcgacgcctgcctgcccaacatcatggtggagaacggccgcactccggcttcatcgactg


 


cggccgcctgggcgtggccgaccgctaccaggacatcgccctggccacccgcgacatcgccgaggagctgggcggcgagtgg


 


gccgaccgcacctggtgctgtacggcatcgccgcccccgactcccagcgcatcgccactaccgcctgctggacgagacacTG


 


Acaattggcagcagcagctcggatagtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttga


 


cctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctattt


 


gcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcg


 


ctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactg


 


caatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatccCGCGTCTCGAACAGAGCGCGCA


 


GAGGAACGCTGAAGGTCTCGCCTCTGTCGCACCTCAGCGCGGCATACACCACAA


 


TAACCACCTGACGAATGCGCTTGGTTCTTCGTCCATTAGCGAAGCGTCCGGTTCA


 


CACACGTGCCACGTTGGCGAGGTGGCAGGTGACAATGATCGGTGGAGCTGATGG


 
















































































gccgtctgcttcgtcctgatccgccccctgtccaagaacacgtaccgccgcatcaaccgcgtggtcgcggagctgctgtggctgga


 


gctggtgtggctgatcgactggtgggcgggcgtgaagatcaaggtcacacggaccacgagacgaccacctgatgggcaagga


 


gcacgccctggtcatctgcaaccacaagtccgacatcgactggctggtcggctgggtcctgggccagcgctccggctgcctgggc


 


tccaccctggcggtcatgaagaagtcctccaagacctgcccgtcctgggctggtccatgtggactccgagtacctgacctggagc


 


gctcctgggccaaggacgagatcacgctgaagtccggcctgaaccgcctgaaggactaccccctgcccactggctggcgctgtt


 


cgtggagggcacgcgcttcacccgcgcgaagctgctggcggcgcagcagtacgccgcgtcctccggcctgcccgtgccccgca


 


acgtgctgatcccccgcacgaagggcttcgtgtcctccgtgtcccacatgcgctccacgtgcccgcgatctacgacgtcaccgtgg


 


ccatccccaagacgtcccccccccccacgctgatccgcatgttcaagggccagtcctccgtgctgcacgtgcacctgaagcgcca


 


cctgatgaaggacctgcccgagtccgacgacgccgtcgcgcagtggtgccgcgacatatcgtggagaaggacgcgctgctgg


 


acaagcacaacgccgaggacaccactccggccaggagctgcaggagaccggccgccccatcaagtccctgctggtcgtcatct


 


cctgggccgtcctggaggtgttcggcgccgtcaagttcctgcagtggtcctccctgctgtcctcctggaagggcctggcgttctccgg


 


catcggcctgggcgtgatcaccctgctgatgcacatcctgatcctgactcccagtccgagcgctccacccccgccaaggtggccc


 


ccgcgaagcccaagaacgagggcgagtcctccaagaccgagatggagaaggagaagTGAttaattaactcgaggcagcag


 


cagctcggatagtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctg


 


ccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccaccccc


 


agcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgct


 


cactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgg


 


gaagtagtgggatgggaacacaaatggaaagcttgagctcagcggcgacggtcctgctaccgtacgacgttgggcacgcccatg


 


aaagtttgtataccgagcttgttgagcgaactgcaagcgcggctcaaggatacttgaactcctggattgatatcggtccaataa


 


tggatggaaaatccgaacctcgtgcaagaactgagcaaacctcgttacatggatgcacagtcgccagtccaatgaacattga


 


agtgagcgaactgttcgcttcggtggcagtactactcaaagaatgagctgctgttaaaaatgcactctcgttctctcaagtgagt


 


ggcagatgagtgctcacgccttgcacttcgctgcccgtgtcatgccctgcgccccaaaatttgaaaaaagggatgagattattg


 


ggcaatggacgacgtcgtcgctccgggagtcaggaccggcggaaaataagaggcaacacactccgcttcttagctcttcg






To determine the impact of the CuPSR23 LPAAT2 and LPAAT3 genes on mid-chain fatty acid accumulation, the above constructs containing the codon optimized CuPSR23 LPAAT2 or LPAAT3 genes driven by the UTEX 1453 AMT3 promoter were transformed into strain B.
Primary transformants were clonally purified and grown under standard lipid production conditions at pH7.0 (all the strains require growth at pH 7.0 to allow for maximal expression of the CuPSR23 LPAAT2 or LPAAT3 gene driven by the pH-regulated AMT3 promoter). The resulting profiles from a set of representative clones arising from these transformations are shown in Table 34, below. D1520 represents clones of Strain B with CuPSR23 LPAAT2 and D1521 represents clones of Strain B with CuPSR23 LPAAT3.







TABLE 34







Fatty acid profiles of Strain B and representative transgenic lines


transformed with pSZ2299 and pSZ2300 DNA.














Sample ID
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2

















Strain B
4.83
28.54
15.64
12.64
1.3
27.99
7.75


D1520-A
8.59
35.09
16.55
11.96
1.69
19.49
5.59


D1520-B
8.13
33.93
16.46
12.44
1.57
20.66
5.96


D1520-C
7.6
33.1
16.21
12.65
1.5
21.41
6.48


D1520-D
7.35
32.54
16.03
12.79
1.67
22.16
6.41


D1520-E
7.28
32.21
16.2
12.99
1.73
22.39
6.28


D1521-A
6.14
31.5
15.98
12.96
1.96
22.52
8


D1521-B
6.17
31.38
15.98
12.87
2.08
22.54
7.92


D1521-C
5.99
31.31
15.75
12.79
2.23
22.45
8.36


D1521-D
5.95
31.05
15.71
12.84
2.48
22.69
8.32


D1521-E
5.91
30.58
15.85
13.22
1.97
23.55
7.84









The transgenic CuPSR23 LPAAT2 strains (D1520A-E) show a significant increase in the accumulation of C10:0, C12:0, and C14:0 fatty acids with a concomitant decrease in C18:1 and C18:2. The transgenic CuPSR23 LPAAT3 strains (D1521A-E) show a significant increase in the accumulation of C10:0, C12:0, and C14:0 fatty acids with a concomitant decrease in C18:1. The expression of the CuPSR23 LPAAT in these transgenic lines appears to be directly responsible for the increased accumulation of mid-chain fatty acids in general, and especially laurates. While the transgenic lines show a shift from longer chain fatty acids (C16:0 and above) to mid-chain fatty acids, the shift is targeted predominantly to C10:0 and C12:0 fatty acids with a slight effect on C14:0 fatty acids. The data presented also show that co-expression of the LPAAT2 and LPAAT3 genes from Cuphea PSR23 and the FATB2 from C. wrightii (expressed in the strain Strain B) have an additive effect on the accumulation of C12:0 fatty acids.
Our results suggest that the LPAAT enzymes from Cuphea PSR23 are active in the algal strains derived from UTEX 1435. These results also demonstrate that the enzyme functions in conjunction with the heterologous FatB2 acyl-ACP thioesterase enzyme expressed in Strain B, which is derived from Cuphea wrightii. 
Example 44
Alteration of Fatty Acid Levels in Strain UTEX1435 by the Expression of Cuphea PSR23LPAATx in Combination with Cuphea wrightii FATB2
Here we demonstrate the effect of expression of a 1-acyl-sn-glycerol-3-phosphate acyltransferase (LPAAT) in a previously described P. moriformis (UTEX 1435) transgenic strain, Strain B. As described above, Strain B is a transgenic strain expressing the acyl ACP thioesterase (FATB2) from Cuphea wrightii, which accumulates C12:0 fatty acids between 40 to 49%. Further to Example 43, a third CuPSR23 LPAAT, LPAATx, was identified by analysis of a combination of CuPSR23 genomic sequences and transcriptomic sequences derived from seed RNAs. Expression of a mid-chain specific LPAAT should thus increase the percentage of TAGs that have a capric acid (C10:0 fatty acid), lauric acid (C12:0 fatty acid), or myristic acid (C14:0 fatty acid) at the sn-2 position, and should consequently elevate the overall levels of these fatty acids. In Example 43, LPAAT2 and LPAAT3 were shown to increase caprate, laurate, and myristate accumulation in strain B. LPAATx was introduced into strain B to determine its effect on fatty acid levels in this strain. The LPAATx gene was codon optimized to reflect UTEX 1435 codon usage. Transformations, cell culture, lipid production and fatty acid analysis were all carried out as previously described.
Decreased Caprate, Laurate, and Myristate Accumulation and Increased Palmitate and Stearate Accumulation in Strain Strain B by the Expression of the Cuphea PSR23 1-acyl-sn-glycerol-3-phosphate acyltransferase (LPAATx) [pSZ2575]:
In this example, transgenic strains were generated via transformation of strain B with the construct pSZ2575 encoding CuPSR23 LPAATx. The transgenic strains were selected for resistance to the antibiotic G418. Construct pSZ2575 can be written as pLOOP5′::CrTUB2:NeoR:CvNR::PmAMT3:CuPSR23 LPAATx:CvNR::pLOOP3′. The sequence of the transforming DNA is provided below (pSZ2575). The relevant restriction sites in the construct from 5′-3′, BspQ1, KpnI, XbaI, MfeI, BamHI, EcoRI, SpeI, XhoI, SacI, BspQ1, respectively, are indicated in lowercase, bold, and underlined. BspQ1 sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences at the 5′ and 3′ end of the construct represent genomic DNA from UTEX 1435 that target integration to the pLoop locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the selection cassette has the C. reinhardtii β-tubulin promoter driving expression of the NeoR gene (conferring resistance to G418) and the Chlorella vulgaris Nitrate Reductase (NR) gene 3′ UTR. The promoter is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for NeoR are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR is indicated by lowercase underlined text. The spacer region between the two cassettes is indicated by upper case text. The second cassette containing the codon optimized LPAATx gene (pSZ2575) from Cuphea PSR23 is driven by the Prototheca moriformis endogenous AMT3 promoter, and has the same Chlorella vulgaris Nitrate Reductase (NR) gene 3′ UTR. In this cassette, the AMT3 promoter is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for the CuPSR23 LPAATx genes are indicated in uppercase italics, while the coding region is indicated by lowercase italics. The 3′ UTR is indicated by lowercase underlined text. The final construct was sequenced to ensure correct reading frame and targeting sequences.
pSZ2575 Transforming Construct:












(SEQ ID NO: 92)


gctcttccgctaacggaggtctgtcaccaaatggaccccgtctattgcgggaaaccacggcgatggcacgtttcaaaacttgat


 


gaaatacaatattcagtatgtcgcgggcggcgacggcggggagctgatgtcgcgctgggtattgcttaatcgccagcttcgcc


 


cccgtcttggcgcgaggcgtgaacaagccgaccgatgtgcacgagcaaatcctgacactagaagggctgactcgcccggca


 


cggctgaattacacaggcttgcaaaaataccagaatttgcacgcaccgtattcgcggtattttgttggacagtgaatagcgatg


 


cggcaatggcttgtggcgttagaaggtgcgacgaaggtggtgccaccactgtgccagccagtcctggcggctcccagggccc


 


cgatcaagagccaggacatccaaactacccacagcatcaacgccccggcctatactcgaaccccacttgcactctgcaatggt


 











 




















cctgggtggagcgcctgttcggctacgactgggcccagcagaccatcggctgctccgacgccgccgtgttccgcctgtccgccca


 


gggccgccccgtgctgttcgtgaagaccgacctgtccggcgccctgaacgagctgcaggacgaggccgcccgcctgtcctggct


 


ggccaccaccggcgtgccctgcgccgccgtgctggacgtggtgaccgaggccggccgcgactggctgctctgggcgaggtgc


 


ccggccaggacctgctgtcctcccacctggcccccgccgagaaggtgtccatcatggccgacgccatgcgccgcctgcacaccc


 


tggaccccgccacctgccccttcgaccaccaggccaagcaccgcatcgagcgcgcccgcacccgcatggaggccggcctggtg


 


gaccaggacgacctggacgaggagcaccagggcctggcccccgccgagctgttcgccgcctgaaggcccgcatgcccgacg


 


gcgaggacctggtggtgacccacggcgacgcctgcctgcccaacatcatggtggagaacggccgcttctccggcttcatcgactg


 


cggccgcctgggcgtggccgaccgctaccaggacatcgccctggccacccgcgacatcgccgaggagctgggcggcgagtgg


 


gccgaccgcttcctggtgctgtacggcatcgccgcccccgactcccagcgcatcgccttctaccgcctgctggacgagttcttccTG


 


Acaattggcagcagcagctcggatagtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttga


 


cctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctattt


 


gcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcg


 


ctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactg


 


caatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatccCGCGTCTCGAACAGAGCGCGCA


 


GAGGAACGCTGAAGGTCTCGCCTCTGTCGCACCTCAGCGCGGCATACACCACAA


 


TAACCACCTGACGAATGCGCTTGGTTCTTCGTCCATTAGCGAAGCGTCCGGTTCA


 


CACACGTGCCACGTTGGCGAGGTGGCAGGTGACAATGATCGGTGGAGCTGATGG


 
















































































ctagtATGgagatccccccccactgcctgtgctccccctcccccgccccctccagctgtactacaagaagaagaagcacgcc


 


atcctgcagacccagacccctaccgctaccgcgtgtcccccacctgcttcgcccccccccgcctgcgcaagcagcacccctacc


 


ccctgcccgtgctgtgctaccccaagctgctgcacttctcccagccccgctaccccctggtgcgctcccacctggccgaggccggc


 


gtggcctaccgccccggctacgagctgctgggcaagatccgcggcgtgtgcttctacgccgtgaccgccgccgtggccctgctgct


 


gttccagtgcatgctgctgctgcaccccttcgtgctgctgttcgaccccttcccccgcaaggccaccacaccatcgccaagctgtg


 


gtccatctgctccgtgtccctgttctacaagatccacatcaagggcctggagaacctgccccccccccactcccccgccgtgtacgt


 


gtccaaccaccagtccttcctggacatctacaccctgctgaccctgggccgcaccttcaagttcatctccaagaccgagatcttcctg


 


taccccatcatcggctgggccatgtacatgctgggcaccatccccctgaagcgcctggactcccgctcccagctggacaccctga


 


agcgctgcatggacctgatcaagaagggcgcctccgtgttcttcttccccgagggcacccgctccaaggacggcaagctgggcg


 


ccttcaagaagggcgcttctccatcgccgccaagtccaaggtgcccgtggtgcccatcaccctgatcggcaccggcaagatcat


 


gccccccggctccgagctgaccgtgaaccccggcaccgtgcaggtgatcatccacaagcccatcgagggctccgacgccgagg


 


ccatgtgcaacgaggcccgcgccaccatctcccactccctggacgacTGAttaattaactcgaggcagcagcagctcggatagt


 


atcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgctttatcaaa


 


cagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttcc


 


ctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgc


 


acagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaaagtagtgggat


 


gggaacacaaatggaaagcttgagctcagcggcgacggtcctgctaccgtacgacgttgggcacgcccatgaaagtttgtatac


 


cgagcttgttgagcgaactgcaagcgcggctcaaggatacttgaactcctggattgatatcggtccaataatggatggaaaat


 


ccgaacctcgtgcaagaactgagcaaacctcgttacatggatgcacagtcgccagtccaatgaacattgaagtgagcgaact


 


gttcgcttcggtggcagtactactcaaagaatgagctgctgttaaaaatgcactctcgttctctcaagtgagtggcagatgagtg


 


ctcacgccttgcacttcgctgcccgtgtcatgccctgcgccccaaaatttgaaaaaagggatgagattattgggcaatggacga


 















To determine the impact of the CuPSR23 LPAATx gene on fatty acid accumulation, the above construct containing the codon optimized CuPSR23 LPAATx gene driven by the UTEX 1453 AMT3 promoter was transformed into strain B.
Primary transformants were clonally purified and grown under low nitrogen conditions at pH7.0; the strains require growth at pH 7.0 to allow for maximal expression of the CuPSR23 LPAATx and CwFATB2 genes driven by the pH-regulated AMT3 promoter. The resulting profiles from a set of representative clones arising from these transformations are shown in Table 35, below. D1542 represents clones of Strain B with CuPSR23 LPAATx.







TABLE 35







Fatty acid profiles of Strain B and representative transgenic lines


transformed with pSZ2575.














Sample ID
C10:0
C12:0
C14:0
C16:0
C18:0
C18:1
C18:2

















Strain B
4.77
28.63
15.48
12.65
1.28
28.20
7.57


D1542-A
1.19
13.25
10.48
21.34
4.49
32.07
14.78


D1542-B
1.15
14.01
10.62
20.61
3.99
32.12
15.24


D1542-C
1.21
13.69
10.83
20.40
3.59
33.54
15.05


D1542-D
1.56
16.83
11.51
18.44
2.94
33.97
12.74


D1542-E
2.15
18.58
11.94
18.22
3.17
32.63
11.62









The transgenic CuPSR23 LPAATx strains (D1542A-E) show a significant decrease in the accumulation of C10:0, C12:0, and C14:0 fatty acids relative to the parent, Strain B, with a concomitant increase in C16:0, C18:0, C18:1 and C18:2. The expression of the CuPSR23 LPAATx gene in these transgenic lines appears to be directly responsible for the decreased accumulation of mid-chain fatty acids (C10-C14) and the increased accumulation of C16:0 and C18 fatty acids, with the most pronounced increase observed in palmitates (C16:0). The data presented also show that despite the expression of the midchain specific FATB2 from C. wrightii (present in Strain B), the expression of CuPSR23 LPAATx appears to favor incorporation of longer chain fatty acids into TAGs.
Our results suggest that the LPAATx enzyme from Cuphea PSR23 is active in the algal strains derived from UTEX 1435. Contrary to Cuphea PSR23LPAAT2 and LPAAT3, which increase mid-chain fatty acid levels, CuPSR23 LPAATx leads to increased C16:0 and C18:0 levels. These results demonstrate that the different LPAATs derived from CuPSR23 (LPAAT2, LPAAT3, and LPAATx) exhibit different fatty acid specificities in Strain B as judged by their effects on overall fatty acid levels.
Example 45
Reduction in Chain Length of Fatty Acid Profile as a Result of Overexpressing an Endogenous Microalgal FATA Acyl-ACP Thioesterase
Here, we demonstrate that over expression of the Prototheca moriformis endogenous thioesterases FATA1 in UTEX1435 results in a clear diminution of cell triglyceride C18:0 and C18:1 acyl chains with an increase in C16:0, C14:0.
Constructs Used for the Over Expression of the P. moriformis FATA1 Gene (pSZ2422, pSZ2421):
To over express the PmFATA1 in P. moriformis STRAIN J, a codon optimized PmFATA1 gene was been transformed into STRAIN J. The Saccharomyces cerevisiae invertase gene was utilized as the selectable marker to confer the ability of growing on sucrose media. The construct pSZ2422 that have been expressed in STRAIN J can be written as: 6SA:: CrTUB2-ScSUC2-CvNR3′:PmAMT3-Pm FATA1 (opt)-CvNR3′::6SB, and the construct pSZ2421 can be written as 6SA:: CrTUB2-ScSUC2-CvNR3′:PmAMT3-S106SAD TP-Pm FATA1 (opt)-CvNR3′::6SB.
The sequence of the transforming DNA is provided below. Relevant restriction sites in the construct pSZ2422 are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Asc I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA from STRAIN J that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene (conferring the ability of STRAIN J to metabolize sucrose) is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by an endogenous amt03 promoter of P. moriformis, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the PmFATA1 are indicated by uppercase, bold italics, while the remainder of the gene is indicated by bold italics. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the STRAIN J 6S genomic region indicated by bold, lowercase text.
Relevant restriction sites in the construct pSZ2421 are the same as pSZ2422. In pSZ2421, the PmFATA1 is fused to the Chlorella protothecoides S106 stearoyl-ACP desaturase transit peptide and the transit peptide is located between initiator ATG of PmFATA1 and the Asc I site.
Nucleotide sequence of transforming DNA contained in pSZ2422:












(SEQ ID NO: 93)


gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtc


 


gctgatgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatga


 


gggaggactcctggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggc


 


cgcctccaactggtcctccagcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtaca


 


gaacaaccacgagccttgtctaggcagaatccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcg


 


accctcgctgccgccgcttctcccgcacgcttctttccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgctt


 


cgccgatctgaggacagtcggggaactctgatcagtctaaacccccttgcgcgttagtgttgccatcctttgcagaccggtgag


 


agccgacttgttgtgcgccaccccccacaccacctcctcccagaccaattctgtcacctttttggcgaaggcatcggcctcggcc


 
































cgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacagggctggatgaacgaccccaacggcc


 


tgtggtacgacgagaaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacgcccttgttctg


 


gggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgc


 


cttctcggctccatggtggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggcca


 


tctggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccaga


 


agaaccccgtgctggccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgac


 


cgcggccaagtcccaggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaa


 


cgagggcttcctcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggt


 


gatgttcatctccatcaaccccggcgccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccattcg


 


aggccttcgacaaccagtcccgcgtggtggacttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgaccta


 


cgggagcgccctgggcatcgcgtgggcctccaactgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccc


 


tcgtgcgcaagttctccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctg


 


aacatcagcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgtcgacctgtc


 


caacagcaccggcaccctggagttcgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgttcgcggacctc


 


tccctctggttcaagggcctggaggaccccgaggagtacctccgcatgggctcgaggtgtccgcgtcctccttcttcctggaccgc


 


gggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtgaacaaccagcccttcaagagcg


 


agaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacgacggcgacgtcgtgtcc


 


accaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgttctacatcgac


 


aagttccaggtgcgcgaggtcaag caattgcagcagctcggatagtatcgacacactctggacgctggtcgtgtgat


 


ggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcg


 


cttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaac


 


ttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcc


 


tggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatcccgcgtctcg


 


aacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcg


 


cttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatg


 










































































































































































acttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctag


 


ctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctg


 


ctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgt


 


aaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaaagcttaattaagagctcttgttttccagaa


 


ggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaatttaaaagctt


 


ggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccgc


 


tcaaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaat


 


tgcctcagaatgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacag


 


cagaccattatgctacctcacaatagttcataacagtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtg


 


gccacccccggccctggtgcttgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatcccaccaccc


 


ccgcgatgggaagaatctctcccgggatgtgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccatacc


 


acacaaatatccttggcatcggccctgaattccttctgccgctctgctacccggtgcttctgtccgaacaggggttgctaggga


 


tcgctccgagtccgaaacccttgtcgcgtggcggggcttgttcgagcttgaagagc









To determine the impact on fatty acid profiles when the endogenous FATA1 gene have been over expressed in STRAIN J, both the P. moriformis FATA1 with native transit peptide and PmFATA1 fused to a Chlorella protothecoides SAD transit peptide were driven by the amt03 promoter and the resulting plasmids were transformed independently into STRAIN J.
Primary transformants were clonally purified and grown under low-nitrogen lipid production conditions at pH7.0 (all the plasmids require growth at pH 7.0 to allow for maximal PmFATA1 gene expression when driven by the pH regulated amt03 promoter). The resulting profiles from representative clones arising from transformations with pSZ2422 and pSZ2421 into STRAIN J are shown in the tables below.
In Table 36, below, the impact of over expressing native PmFATA1 is a clear diminution of C18:1 chain lengths with an increase in C16:0, C14:0, and possibly in C18:0. Considering the protein localization of processing, we also tried the PmFATA1 fused to a Chlorella protothecoides stearoyl-ACP desaturase transit peptide. Similar to the results we observed in the amt03-native PmFATA1 construct, the C16:0 and C14:0 levels are significantly higher than the parental strain J.







TABLE 36







Fatty acid profiles in Strain J and derivative transgenic lines transformed


with pSZ2422 DNA.












Sample ID
C14:0
C16:0
C18:0
C18:1
C18:2





pH 7; Strain J; T374;
7.69
55.00
4.92
24.94
5.19


D1377-7 96well


pH 7; Strain J; T374;
6.39
54.11
5.85
25.91
5.76


D1377-13 96well


pH 7; Strain J; T374;
6.57
53.55
4.68
27.18
5.74


D1377-14 96well


pH 7; Strain J; T374;
5.29
49.93
4.24
30.76
7.27


D1377-16 96well


pH 7; Strain J; T374;
4.76
49.10
4.75
32.36
6.77


D1377-9 96well


pH 7; Strain J; T374;
4.28
46.06
5.14
35.87
6.69


D1377-19 96well


Ctrl-pH7; Strain J
1.42
27.63
3.31
57.20
8.00
















TABLE 37







Fatty acid profiles in STRAIN J and derivative transgenic lines


transformed with pSZ2421 DNA.












Sample ID
C14:0
C16:0
C18:0
C18:1
C18:2





pH 7; STRAIN J; T374;
6.76
57.06
4.12
23.66
6.07


D1376-21 96well


pH 7; STRAIN J; T374;
6.56
54.62
5.44
25.69
5.64


D1376-22 96well


pH 7; STRAIN J; T374;
4.54
48.38
4.27
33.23
7.24


D1376-23 96well


pH 7; STRAIN J; T374;
4.48
47.66
4.60
34.28
6.91


D1376-19 96well


pH 7; STRAIN J; T374;
4.53
47.30
4.67
34.51
6.80


D1376-20 96well


pH 7; STRAIN J; T374;
3.56
42.70
4.03
39.85
7.52


D1376-17 96well


Ctrl-pH7; STRAIN J
1.42
27.63
3.31
57.20
8.00









Thus, we conclude that percent myristic and lauric acid levels in the fatty acid profile of a microalgal cell can be increased by overexpression of a C18-preferring acyl-ACP thioesterase.
Example 46
Natural Oils Suitable for Use as Roll-In Shortenings
The nutritional and functional properties of edible fats have been traditionally associated with specific chemical compositions and crystallization conditions. Switching from one oil source to another is usually a difficult task since both the melting behavior and structure of the fat changes dramatically, leading to adverse changes in functionality. In recent history, we can recall the painful period when partially hydrogenated fats were replaced with palm oil and palm oil fractions. We examined how the yield stress, elastic modulus, polymorphism, microstructure and melting profile of two fats with vastly different chemical compositions can be matched. Oil A was produced from Prototheca moriformis cells expressing an exogenous invertase and an Ulmus americana acyl-ACP thioesterase with a Chlorella protothecoides plastid targeting sequence. Oil B was produced from Prototheca moriformis cells expressing an exogenous invertase and a Cuphea hookeriana acyl-ACP thioesterase. Oil A contained greater than 62% (w/w) medium chain fatty acids, or MCT (C8:0-C14:0), 23% (C16:0+C18:0) and 9% C18:1, while Oil B contained less than 2% C8:0-C14:0, 54% (C16:0+C18:0) and 29% C18:1. Oil A was thus a medium chain triglyceride rich fat, while Oil B resembled palm oil. Both oils had a solid fat content of  ̃45% at 20° C., and very similar SFC versus temperature profiles. DSC (dynamic scanning calorimetry) melting profiles showed two major peaks centered around  ̃12-13° C. and  ̃28-35° C. Both fats were in the beta-prime polymorphic form (as determined by X-ray diffraction) and displayed asymmetric, elongated crystallite morphology with characteristic features. The yield stresses and storage moduli (G′) of Oil A and Oil B were 520-550 Pa, and 7×106 Pa-1.8×107 Pa, respectively. A yield stress in this region suggests a satisfactory plasticity, which combined with a high storage modulus makes for an ideal roll-in shortening. Thus, it is possible to alter the chemical composition of a food oil while retaining its lamination functionality.
Other suitable enzymes for use with the cells and methods of any of the above embodiments of the invention include those that have at least 70% amino acid identity with one of the proteins listed in the description above and that exhibit the corresponding desired enzymatic activity. In additional embodiments, the enzymatic activity is present in a sequence that has at least about 75%, at least about 80%, at least about 85%, at least about 90%, at least about 95%, or at least about 99% identity with one of the above described nucleic acid sequences, all of which are hereby incorporated by reference as if fully set forth.
Example 47
Fractionation to Remove Trisaturates from a Tailored Microbial Oil that is a Cocoa Butter Mimetic
A refined bleached and deodorized oil was obtained from Strain K4 (see Example 35). The oil was heated to 70° C. and cooled at 0.5° C. per min to 36° C. and held at 36° C. for 1 hour. An approximately 2.5 ml sample was then centrifuged at 36° C. for 1 hour at 4300. A liquid supernatant was recovered and analyzed using lipase and mass spectrometry. The sample was found to be depleted in tristearin (SSS), SSP, and PPS. The triacylglycerols of the sample were found to be very similar to that of cocoa butter and the liquid supernatant was even closer to that of cocoa butter in terms of low amounts of trisaturates.







TABLE 38







TAG profile of oil from the K4 strain before and after fractionation as


compared to cocoa butter.














fractionation






upper layer



TAG
K4 oil
(liquid)
cocoa butter
















OOL (+?)
0.12
0.12
0.00



POL
0.23
0.31
0.33



PLP
2.41
3.38
1.58



MOP
0.93
1.25
0.00



PPM (+MMS)
0.42
0.29
0.00



OOO
0.23
0.34
0.00



SOL
0.36
0.47
0.32



OOP
0.95
1.42
2.44



PLS
5.66
7.90
2.90



POP (+MSO)
11.80
15.20
17.93



PPP + MPS
2.22
1.07
0.36



OOS
1.19
1.68
3.02



SLS (+PLA)
3.96
5.11
1.77



POS
27.22
32.80
40.25



PPS (+SSM)
6.47
1.52
0.49



MaOO
0.00
0.00
0.36



SLA
0.31
0.34
0.00



SOS (+POA)
17.84
22.50
24.93



SSP (+PPA)
9.24
0.96
0.63



SOA (+POB)
1.39
1.68
1.51



SSS (+PSA)
5.25
0.23
0.33



SOB + LgOP
0.38
0.44
0.27



SSA
0.41
0.00
0.00



SOLg
0.41
0.00
0.00



PSLg + ASB
0.26
0.00
0.00



SOHx
0.12
0.51
0.00



SSLg
0.21
0.14
0.15



SUM area %
100.00
99.67
99.57










Example 48
Production of High-Stearate Triglyceride Oil in an Oleaginous Cell by Overexpression of KASII, Knockout of One Sad Allele and Repression of a Second Sad Allele
The oleaginous, non-photosynthetic alga, Prototheca moriformis, stores copious amounts of triacylglyceride oil under conditions where the nutritional carbon supply is in excess, but cell division is inhibited due to limitation of other essential nutrients. Bulk biosynthesis of fatty acids with carbon chain lengths up to C18 occurs in the plastids; fatty acids are then exported to the endoplasmic reticulum where elongation past C18 and incorporation into triacylglycerides (TAGs) is believed to occur. Lipids are stored in large cytoplasmic organelles called lipid bodies until environmental conditions change to favor growth, whereupon they are rapidly mobilized to provide energy and carbon molecules for anabolic metabolism. Wild-type P. moriformis storage lipid is mainly comprised of  ̃60% oleic (C18:1),  ̃25-30% palmitic (C16:0), and  ̃5-8% linoleic (C18:2) acids, with minor amounts of stearic (C18:0), myristic (C14:0), a-linolenic (C18:3 a), and palmitoleic (C16:1) acids. This fatty acid profile results from the relative activities and substrate affinities of the enzymes of the endogenous fatty acid biosynthetic pathway. P. moriformis is amenable to manipulation of fatty acid and lipid biosynthesis using molecular genetic tools, enabling the production of oils with fatty acid profiles that are very different to the wild-type composition. Herein we describe strains where we have modified the expression of stearoyl-ACP desaturase (SAD) and β-ketoacyl-ACP synthase II (KASH) genes in order to generate strains with up to 57% stearate and as little as 7% palmitate. We identify additional strains with up to 55% stearate and as low as 2.4% linoleate when we perform similar modifications in conjunction with down-regulating the expression of the FATA thioesterase and the FAD2 fatty acid desaturase genes.
Soluble SADs are plastid-localized, di-iron enzymes which catalyze the desaturation of acyl carrier protein (ACP)-bound stearate to oleate (C18:1 cis-Δ9). Previously, we have established that hairpin constructs targeting the SAD1 or SAD2 transcripts activate the cellular RNA interference (RNAi) machinery, down-regulating SAD activity and resulting in elevated levels of C18:0 in the storage lipid. SAD activity is also reduced in strains where we disrupt one of the two alleles of SAD2, encoding the major SADs that are expressed during storage lipid biosynthesis. The Fatty Acid Desaturase 2 (FAD2) gene encodes an endoplasmic reticulum membrane-associated desaturase that converts oleate to linoleate (C18:2 cis-Δ9, cis-Δ12). Hairpin RNAi constructs targeting FAD2 reduce linoleate levels to 1-2%. KASII is a fatty acid synthase which specifically catalyzes the condensation of malonyl-ACP with palmitoyl (C16:0)-ACP to form β-keto-stearoyl-ACP. We have shown that overexpression of KASII in P. moriformis causes C16:0 levels to decrease with a concomitant increase in C18:1 abundance. In the examples below we demonstrate that by down-regulating SAD gene expression using RNAi, disrupting an allele of the SAD2 gene, and overexpressing the KASII fatty acid synthase, we generate strains capable of accumulating stearate in excess of 50% of the total fatty acids, and with SOS as the major TAG species. SOS levels increase up to 47% in strains which combine SAD2 and FAD2 down-regulation with KASII overexpression.
Constructs Used for SAD2 Knockout/RNAi in Strain J: A DNA construct, pSZ2282, was made to simultaneously disrupt the SAD2-1 allele and express a SAD2 hairpin construct in Strain J. A Saccharomyces cerevisiae SUC2 gene, encoding sucrose invertase, which was codon-optimized for expression in P. moriformis, was utilized as a selectable marker for transformation. The sequence of the transforming DNA is provided immediately below. Relevant restriction sites are indicated in lowercase, bold, and are from 5′-3′ BspQI, KpnI, AscI, MfeI, BamHI, AvrII, EcoRV, EcoRI, SpeI, BamHI, HinDIII, and SacI, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Underlined sequences at the 5′ and 3′ flanks of the construct represent genomic DNA from P. moriformis that enable targeted integration of the transforming DNA via homologous recombination at the SAD2-1 locus. Proceeding in the 5′ to 3′ direction, the Chlamydomonas reinhardtii TUB2 promoter driving the expression of the Saccharomyces cerevisiae SUC2 gene (encoding sucrose hydrolyzing activity, thereby permitting the strain to grow on sucrose) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for SUC2 are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR of the Chlorella vulgaris nitrate reductase (NR) gene is indicated by small capitals, followed by a spacer region indicated by lowercase text. A second C. reinhardtii TUB2 promoter sequence, indicated by lowercase boxed text, drives expression of the SAD2 hairpin C sequence. The sense and antisense strands are indicated with uppercase, bold italics, and are separated by the P. moriformis Δ12-fatty acid desaturase (FAD2) intron and the first 10 bases of the FAD2 second exon (uppercase italics). A second C. vulgaris NR3′ UTR is indicated by small capitals.
Nucleotide sequence of the transforming DNA from pSZ2282:








(SEQ ID NO: 94)



gctcttcgggtcgccgcgctgcctcgcgtcccctggtggtgcgcgcggtcgccagcgaggccccgctgggcgttccgccctcggtgcagc



 


gcccctcccccgtggtctactccaagctggacaagcagcaccgcctgacgcccgagcgcctggagctggtgcagagcatggggcagtttg


 


cggaggagagggtgctgcccgtgctgcaccccgtggacaagctgtggcagccgcaggactttttgcccgaccccgagtcgcccgacttcg


 


aggatcaggtggcggagctgcgcgcgcgcgccaaggacctgcccgacgagtactttgtggtgctggtgggggacatgatcacggaggagg


 


cgctgccgacctacatggccatgctcaacacgctggacggcgtgcgcgacgacacgggcgcggccgaccacccgtgggcgcgctggacgc


 


ggcagtgggtggccgaggagaaccggcacggcgacctgctgaacaagtactgctggctgacggggcgcgtcaacatgcgggccgtggagg


 


tgaccatcaacaacctgatcaagagcggcatgaacccgcagacggacaacaacccttatttggggttcgtctacacctccttccaggagc


 








ttcctgctggccggcttcgccgccaagatcagcgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaag


 


ggctggatgaacgaccccaacggcctgtggtacgacgagaaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtc


 


tgggggacgcccttgttctggggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaac


 


gactccggcgccttctccggctccatggtggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgc


 


gtggccatctggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccag


 


aagaaccccgtgctggccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcg


 


gccaagtcccaggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttc


 


ctcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggtgatgttcatctccatc


 


aaccccggcgccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccacttcgaggccttcgacaaccagtcc


 


cgcgtggtggacttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgacctacgggagcgccctgggcatcgcgtgg


 


gcctccaactgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccctcgtgcgcaagttctccctcaacaccgag


 


taccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctgaacatcagcaacgccggcccctggagccggttcgcc


 


accaacaccacgttgacgaaggccaacagctacaacgtcgacctgtccaacagcaccggcaccctggagttcgagctggtgtacgccgtc


 


aacaccacccagacgatctccaagtccgtgttcgcggacctctccctctggttcaagggcctggaggaccccgaggagtacctccgcatg


 


ggcttcgaggtgtccgcgtcctccttcttcctggaccgcgggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgc


 


atgagcgtgaacaaccagcccttcaagagcgagaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctg


 


tacttcaacgacggcgacgtcgtgtccaccaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtg


 


gacaacctgttctacatcgacaagttccaggtgcgcgaggtcaagTGAcaattgGCAGCAGCAGCTCGGATAGTATCGACACACTCTGGA


 


CGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTT


 


TGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATAT


 


CGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTG


 


GTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACA


 


AATGGAggatcccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaata


 


accacctgacgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatg


 














CACACTCTGGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGC


 


CTCAGTGTGTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCC


 


TCGTTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTC


 


GCACAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGG


 


ATGGGAACACAAATGGAAAGCTGgagctccagccacggcaacaccgcgcgccttgcggccgagcacggcgacaagaacctgagcaagatc


 


tgcgggctgatcgccagcgacgagggccggcacgagatcgcctacacgcgcatcgtggacgagttcttccgcctcgaccccgagggcgcc


 


gtcgccgcctacgccaacatgatgcgcaagcagatcaccatgcccgcgcacctcatggacgacatgggccacggcgaggccaacccgggc


 


cgcaacctcttcgccgacttctccgcggtcgccgagaagatcgacgtctacgacgccgaggactactgccgcatcctggagcacctcaac


 


gcgcgctggaaggtggacgagcgccaggtcagcggccaggccgccgcggaccaggagtacgtcctgggcctgccccagcgcttccggaaa


 


ctcgccgagaagaccgccgccaagcgcaagcgcgtcgcgcgcaggcccgtcgccttctcctggatctccgggcgcgagatcatggtctag


 


ggagcgacgagtgtgcgtgcggggctggcgggagtgggacgccctcctcgctcctctctgttctgaacggaacaatcggccaccccgcgc


 


tacgcgccacgcatcgagcaacgaagaaaaccccccgatgataggttgcggtggctgccgggatatagatccggccgcacatcaaagggc


 


ccctccgccagagaagaagctcctttcccagcagactcctgaagagc






Identification and Analysis of SAD2 Knockout/Knockdown Strains: Construct D1283, derived from pSZ2282, was transformed into Strain J. Primary transformants were clonally purified and grown under standard lipid production conditions at pH 5. The resulting fatty acid profiles from representative clones arising from transformation with pSZ2282 into Strain J are summarized in Table 39, below. D1283 transformants accumulated up to  ̃42% C18:0 at the expense of C18:1, indicating that SAD activity was significantly reduced in these strains.







TABLE 39







Fatty acid profiles of D1283 [pSZ2282] primary transformants, compared to the 


wild-type parental strain, Strain J.














Strain
S1920
D1283-4
D1283-7
D1283-19
D1283-27
D1283-40
D1283-24


















Fatty 
C12:0
0.04
0.05
0.06
0.07
0.06
0.04
0.05


Acid
C14:0
1.31
0.92
1.07
1.01
1.08
1.03
0.96


Area %
C16:0
26.68
28.23
29.21
27.24
27.67
27.02
27.07



C16:1
0.78
0.05
0.06
0.08
0.33
0.14
0.12



C17:0
0.11
0.12
0.15
0.10
0.10
0.12
0.13



C18:0
3.15
41.98
40.94
34.20
26.26
23.18
22.82



C18:1
59.30
19.37
18.17
26.87
34.77
38.74
39.38



C18:2
7.47
6.22
7.43
7.42
7.31
7.25
7.38



C18:3α
0.57
0.93
1.03
0.75
0.71
0.72
0.51



C20:0
0.32
1.81
1.67
1.75
1.35
1.36
1.23



C20:1
0.00
0.10
0.00
0.12
0.00
0.12
0.11



C22:0
0.05
0.17
0.13
0.20
0.16
0.16
0.15



C24:0
0.00
0.00
0.00
0.10
0.00
0.00
0.00














sum C18
70.49
68.5
67.57
69.24
69.05
69.89
70.09


saturates
31.66
73.28
73.23
64.67
56.68
52.91
52.41


unsaturates
68.12
26.67
26.69
35.24
43.12
46.97
47.50









In Table 39, Stearate (C18:0) levels greater than the wild-type level are highlighted with bold text.
The fatty acid profiles of transformants D1283-4 and -7 were determined to be stable after more than 30 generations of growth in the absence of selection (growth on sucrose). The performance of selected strains in shake flask assays was then evaluated, and the fatty acid profiles and lipid titers are presented in Table 40, below. Strain X had the highest level of C18:0 ( ̃44%) and the best lipid titer ( ̃26%) relative to the Strain J parent, and so was selected for further fermentation development.







TABLE 40







Fatty acid profiles and lipid titers of SAD2 knockout/knock-down strains derived from


D1283 primary transformants, compared to the wild-type parental strain, Strain J.











Primary












T342; D1283-4
T342; D1283-7














Strain
Strain 1
S4490
S4491
S4492
S4493
S4494
K+4


















Fatty Acid
C14:0
1.59
1.61
1.58
1.55
1.81
1.84
1.34


Area %
C16:0
30.47
29.41
28.58
29.24
28.77
29.09
28.47



C16:1
0.82
0.05
0.07
0.05
0.07
0.05
0.06



C17:0
0.10
0.30
0.29
0.28
0.46
0.37
0.19



C18:0
3.58
42.85
41.86
43.38
39.99
41.41
44.42



C18:1
56.96
13.52
15.55
13.49
13.57
12.98
15.64



C18:2
5.50
8.01
7.85
7.65
10.37
9.47
5.72



C18:3α
0.37
0.78
0.73
0.82
0.95
0.91
0.64



C20:0
0.22
2.06
2.11
2.11
1.98
1.98
2.32



C22:0
0.05
0.32
0.34
0.33
0.33
0.32
0.35



C24:0
0.03
0.43
0.42
0.44
0.49
0.49
0.37














lipid titer (% parent)
100
12.3
12.6
13.6
6.2
8.2
25.9









In Table 40, Stearate (C18:0) levels greater than the wild-type level are highlighted with bold text.
We optimized the performance of strain X in 7-L fermentations, and found that we could match the  ̃44% C18:0 level obtained in shake flasks, with lipid productivities that were  ̃45% of the wild-type parent. The fatty acid profiles and lipid titers of representative strain X fermentations are summarized in Table 41, below. Fermentation of strain X under optimal conditions yielded nearly 44% C18:0, which was similar to the stearate level that accumulated in shake flask assays. Strain K-4 produced high C18:0 levels at both flask and 7-L scale and had acceptable lipid productivity in 7-L fermentations; consequently this strain was selected as a base strain for additional modifications aimed at increasing C18:0 accumulation







TABLE 41







Fatty acid profiles and lipid titers of strain X, compared to a control


transgenic strain Strain Y.









Strain












Strain Y
K-4
K-4
K-4









Fermentation












110088F14
120489F5
120531F8
120580F1
















Fatty Acid
C14:0
1.47
1.18
1.15
1.27


Area %
C16:0
25.66
28.68
28.38
28.35



C16:1
0.71
0.11
0.09
0.06



C18:0
3.16
41.63
42.40
43.67



C18:1
62.24
20.78
19.38
17.63



C18:2
5.90
5.06
5.38
5.58



C18:3α
0.16
0.24
0.25
0.25



C20:0
0.24
1.36
1.99
2.11



C22:0
0.05
0.19
0.28
0.31



C24:0
0.05
0.34
0.29
0.31











sum C18
71.46
67.71
67.41
67.13


saturates
30.63
73.38
74.49
76.02


unsaturates
69.01
26.19
25.10
23.52


total lipid (g/L)
930
383
539
475









In Table 41, Stearate (C18:0) levels greater than the control are highlighted with bold text. Strain Y contains S. cerevisiae SUC2, encoding sucrose invertase, integrated at the 6S locus, and has a fatty acid profile that is indistinguishable from the Strain J wild-type parent.
Constructs Used for KASII Overexpression in Strain K-4: DNA construct pSZ2734 was made to overexpress a codon-optimized P. moriformis KASII gene in Strain X. The neoR gene from transposon Tn5, conferring resistance to aminoglycoside antibiotics, was used as a selectable marker for transformation. The sequence of the transforming DNA is provided immediately below. Relevant restriction sites are indicated in lowercase, bold, and are from 5′-3′ BspQI, KpnI, XbaI, MfeI, BamHI, AvrII, EcoRV, SpeI, AscI, ClaI, BglII, AflII, HinDIII and SacI, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Underlined sequences at the 5′ and 3′ flanks of the construct represent genomic DNA from P. moriformis that enable targeted integration of the transforming DNA via homologous recombination at the 6S locus. Proceeding in the 5′ to 3′ direction, the C. reinhardtii TUB2 promoter driving the expression of neoR (encoding aminoglycoside phosphotransferase activity, thereby permitting the strain to grow on G418) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for neoR are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR of the C. vulgaris NR gene is indicated by small capitals, followed by a spacer region indicated by lowercase text. The P. moriformis SAD2-2 promoter sequence, indicated by boxed text, drives expression of the codon-optimized P. moriformis KASII gene. The region encoding the KASII plastid targeting sequence is indicated by uppercase italics. The sequence that encodes the mature P. moriformis KASII polypeptide is indicated with bold, underlined, uppercase italics, while a 3×FLAG epitope encoding sequence is in bold italics. A second C. vulgaris NR3′ UTR is indicated by small capitals.
Nucleotide sequence of the transforming DNA from pSZ2734:








(SEQ ID NO: 95)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtcgctga



 


tgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggaggactcct


 


ggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaactggtcctcca


 


gcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggtgtatgaattgtacagaacaaccacgagccttgtctaggcaga


 


atccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgccgcttctcccgcacgcttctt


 


tccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagtcggggaactctgatcagtctaaa


 


cccccttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccaccccccacaccacctcctcccagacca


 


attctgtcacctttttggcgaaggcatcggcctcggcctgcagagaggacagcagtgcccagccgctgggggttggcggatgcacgctca


 








gctcccccgccgcctgggtggagcgcctgttcggctacgactgggcccagcagaccatcggctgctccgacgccgccgtgttccgcctgt


 


ccgcccagggccgccccgtgctgttcgtgaagaccgacctgtccggcgccctgaacgagctgcaggacgaggccgcccgcctgtcctggc


 


tggccaccaccggcgtgccctgcgccgccgtgctggacgtggtgaccgaggccggccgcgactggctgctgctgggcgaggtgcccggcc


 


aggacctgctgtcctcccacctggcccccgccgagaaggtgtccatcatggccgacgccatgcgccgcctgcacaccctggaccccgcca


 


cctgccccttcgaccaccaggccaagcaccgcatcgagcgcgcccgcacccgcatggaggccggcctggtggaccaggacgacctggacg


 


aggagcaccagggcctggcccccgccgagctgttcgcccgcctgaaggcccgcatgcccgacggcgaggacctggtggtgacccacggcg


 


acgcctgcctgcccaacatcatggtggagaacggccgcttctccggcttcatcgactgcggccgcctgggcgtggccgaccgctaccagg


 


acatcgccctggccacccgcgacatcgccgaggagctgggcggcgagtgggccgaccgcttcctggtgctgtacggcatcgccgcccccg


 


actcccagcgcatcgccttctaccgcctgctggacgagttcttcTGAcaattgGCAGCAGCAGCTCGGATAGTATCGACACACTCTGGAC


 


GCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTT


 


GATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATC


 


GCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGG


 


TTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAA


 


ATGGAggatcccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataa


 


ccacctgacgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatga


 














TTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCT


 


AGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTG


 


TCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGC


 


AACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAaagcttaattaagagctcttgttttcc


 


cagaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaatttaaaagct


 


tggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccgctcaaac


 


cgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaattgcctcagaa


 


tgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacagcagaccattatgctacc


 


tcacaatagttcataacagtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtggccaccccccggccctggtgct


 


tgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatcccaccacccccgcgatgggaagaatctctccccgggatg


 


tgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatatccttggcatcggccctgaattccttctg


 


ccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgcaaacccttgtcgcgtggcggggcttgtt


 


cgagcttgaagagc






Overexpression of KASII in Strain X: Construct D1643 derived from pSZ2734 was transformed into Strain X as described previously. Primary transformants were clonally purified and grown under standard lipid production conditions at pH 5. The resulting fatty acid profiles from representative clones arising from transformation of Strain X with D1643 are summarized in Table 42, below. Overexpression of KASII in the SAD2 knockout/knock-down strain K-4 background resulted in multiple strains accumulating over 50% C18:0 and with substantially reduced levels of C16:0. We also observed that KASII over-expressing lines had lower overall ratios of saturated to unsaturated fatty acids compared to StrainX.







TABLE 42







Fatty acid profiles of D1653 [pSZ2734] primary transformants, compared


to the Strain X base strain and the wild-type parental strain, Strain J.


























D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-
D1653-





















Strain
J
X
89
10A
28
58
7A
75
90
98
72
68
82
66

























Fatty
C12:0
0.04
0.06
0.27
0.13
0.20
0.19
0.24
0.13
0.12
0.27
0.16
0.18
0.25
0.22


Acid
C14:0
1.44
1.06
1.55
1.65
1.79
1.67
1.70
1.53
1.50
1.74
1.57
1.64
1.48
1.56


Area
C16:0
29.23
29.83
8.16
11.45
10.68
10.11
9.27
11.14
11.08
9.40
9.78
9.95
8.12
8.65


%
C16:1
0.88
0.10
0.04
0.00
0.00
0.00
0.00
0.04
0.04
0.00
0.04
0.00
0.05
0.06



C18:0
2.97
40.17
54.25
53.87
53.61
53.46
53.32
53.32
53.15
52.43
52.20
51.23
50.52
50.02



C18:1
58.07
20.15
23.52
22.12
22.20
23.48
24.02
22.73
23.45
23.94
25.21
26.07
28.00
28.29



C18:2
6.25
5.25
6.75
6.05
6.42
6.25
6.56
6.19
5.96
6.88
6.28
6.31
6.59
6.31



C18:3α
0.50
0.68
0.79
0.88
0.78
0.79
0.79
0.85
0.82
0.86
0.78
0.78
0.78
0.83



C20:0
0.22
1.88
3.21
2.81
3.01
2.91
3.02
2.86
2.77
3.21
2.74
2.80
2.87
2.80



C20:1
0.02
0.07
0.19
0.21
0.34
0.27
0.28
0.12
0.11
0.41
0.14
0.30
0.28
0.26



C22:0
0.05
0.26
0.41
0.34
0.40
0.37
0.37
0.36
0.35
0.42
0.36
0.37
0.36
0.37



C24:0
0.04
0.27
0.49
0.38
0.42
0.41
0.45
0.38
0.36
0.46
0.39
0.37
0.41
0.41





















sum C18
67.78
66.24
85.31
82.92
83.01
83.98
84.69
83.09
83.38
84.11
84.47
84.39
85.89
85.45


saturates
33.97
73.52
68.34
70.63
70.11
69.12
68.37
69.72
69.33
67.93
67.20
66.54
64.01
64.03


unsaturates
65.71
26.23
31.29
29.26
29.74
30.79
31.65
29.93
30.38
32.09
32.45
33.46
35.70
35.75









In Table 42, Stearate (C18:0) levels greater than the wild-type level are highlighted with bold text. Palmitate (C16:0) levels lower than strain X or Strain J are highlighted with bold. For three strains the ratio of saturated to unsaturated fatty acids is ≦2:1; these are highlighted with bold, italicized text.
Stable lines were isolated from the primary transformants shown in Table 42. The fatty acid profiles and lipid titers of shake flask cultures are presented in Table 43, below. The strains accumulated up to 55% C18:0, with as low as 7% C16:0, with comparable lipid titers to the strain X parent. The saturates:unsaturates ratios were substantially reduced compared to strain X. Strains AU and AV were selected for evaluation in 3-L high-density fermentations.







TABLE 43







Shake flask assays of strains derived from D1653, expressing KASII, driven by the PmSAD2-2 promoter, targeted to the 6S locus.











PPrimary



















D1653-6B
D1653-9B
D1653-10A
D1653-72
D1653-89



















SStrain
S1920J
KK-4X
SS5664
SAU
SSBM
BBBN
BBBO
BBBP
BBBQ
BBBR
AAV
BBBS























Fatty Acid 
C10:0
0.02
0.04
0.08
0.09
0.12
0.06
0.06
0.08
0.09
0.12
0.12
0.12


Area %
C12:0
0.04
0.09
0.28
0.29
0.35
0.20
0.20
0.23
0.26
0.32
0.32
0.33



C14:0
1.42
1.12
1.81
1.66
1.73
1.75
1.72
1.50
1.61
1.38
1.43
1.38



C16:0
25.59
28.56
9.39
8.61
8.44
9.98
10.11
8.26
8.95
6.81
7.21
6.63



C16:1
1.03
0.10
0.06
0.05
0.06
0.06
0.06
0.04
0.04
0.03
0.03
0.03



C18:0
2.60
40.13
47.60
52.47
55.12
50.25
49.73
54.56
54.01
52.96
53.68
52.12



C18:1
62.08
20.74
27.78
23.93
21.31
25.37
25.70
22.86
22.87
24.37
23.99
25.17



C18:2
6.16
5.83
7.98
7.52
7.72
7.55
7.64
7.20
7.24
8.11
7.83
8.04



C18:3α
0.40
0.89
1.21
1.22
1.49
1.17
1.07
1.20
1.29
1.28
1.24
1.31



C20:0
0.18
1.82
2.62
2.93
2.75
2.65
2.66
2.97
2.72
3.43
3.10
3.59



C20:1
0.04
0.13
0.37
0.36
0.39
0.34
0.34
0.35
0.34
0.48
0.41
0.47



C20:1
0.07
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00



C20:1
0.15
0.08
0.11
0.09
0.11
0.10
0.10
0.09
0.10
0.12
0.10
0.12



C22:0
0.02
0.20
0.28
0.30
0.24
0.29
0.28
0.30
0.27
0.32
0.29
0.35



C24:0
0.00
0.03
0.16
0.29
0.00
0.03
0.15
0.16
0.02
0.05
0.04
0.07



















Sum C18
71.23
67.58
84.57
85.13
85.63
84.34
84.13
85.81
85.40
86.71
86.73
86.63


Saturates
29.86
71.97
62.22
66.63
68.74
65.20
64.90
68.05
67.90
65.37
66.17
64.57


Unsats
69.91
27.76
37.50
33.15
31.07
34.57
34.89
31.73
31.87
34.37
33.59
35.13









In Table 43, strain X is the parent strain; Strain J is the wild-type base strain. Stearate (C18:0) levels at least two-fold higher than in the wild-type strain are highlighted in bold. Palmitate levels that are less than in Strain J and strain X are highlighted bold. Bold italics indicate that the saturates:unsaturates ratio is ≦2:1.
The fatty acid profiles and performance metrics of strains AU and AV are detailed in Table 44, below. The fatty acid profile of the parent strain strain K-4, grown under the same fermentation conditions, is presented for comparison. The strains that over-express KASII accumulate about 11% more C18:0 than the strain K-4 parent. C16:0 is reduced to 7-9%, and levels of unsaturated fatty acids increase by 4-5%. The lipid titers of strains AU and AV were comparable to strain X, indicating that KASII over-expression did not have deleterious effects on lipid production.







TABLE 44







End point fatty acid profiles of biomass from strains X, AU and AV


fermentations.









Strain











X
AU
AV









Fermentation











120580F1
130097F3
130098F4
















pH
5
5
5



C14:0
1.27
1.50
1.35



C16:0
28.35
8.88
7.33



C16:1
0.06
0.02
0.03



C18:0
43.67
56.88
57.24



C18:1
17.63
21.57
21.66



C18:2
5.58
6.06
6.94



C18:3α
0.25
0.29
0.22



C20:0
2.11
3.28
3.46



C22:0
0.31
0.40
0.40



C24:0
0.31
0.37
0.40



sum C18
67.13
84.80
86.06



saturates
76.02
71.31
70.18



unsaturates
23.52
27.94
28.85



total lipid (g/L)
475
529
418










The fermentations were cultured for 6 days using a fed-batch process. The Strain X fatty acid profile from fermentation 120580F1 was presented in Table 41, and is shown again in Table 44 for comparison with Strains AU and AV. All fermentations were carried out at 32° C., pH 5, 30% dissolved oxygen (DO), 300 mM nitrogen [N], and 557.5 μM iron. The sugar source was 70% sucrose (S70). Stearate (C18:0) levels higher than in the wild-type strain are indicated with bold. Palmitate (C16:0) levels that are less than in the wild-type are highlighted bold.
Lab scale oils were prepared from biomass derived from the shake flasks and fermentations described above. The TAG compositions of these oils were determined by LC/MS. SOS is the major TAG species in both Strains AU and AV, ranging from 33-35% in the biomass from shake flasks, and reaching 37% in the high-density fermentation biomass. The major palmitate-containing TAGs are substantially reduced, and trisaturate levels are less than half of those observed in Strain X oils. These results demonstrate that KASII over-expression in a high-stearate background significantly improves SOS accumulation, and reduces the accumulation of trisaturated TAGs.
Constructs Used for FATA-1 Disruption, KASII Over-Expression and FAD2 RNAi in Strain J: A DNA construct, pSZ2419, was made to simultaneously disrupt the FATA-1 allele, over-express P. moriformis KASII and express a FAD2 hairpin construct in Strain J. A version of the S. cerevisiae SUC2 gene, encoding sucrose invertase, which was codon-optimized for expression in P. moriformis, was utilized as a selectable marker for transformation. The sequence of the transforming DNA is provided immediately below. Relevant restriction sites are indicated in lowercase, bold, and are from 5′-3′ BspQI, KpnI, AscI, MfeI, BamHI, AvrII, EcoRV, EcoRI, SpeI, AscI, ClaI, BglII, AflII, HinDIII, SacI, SpeI, and XhoI, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Underlined sequences at the 5′ and 3′ flanks of the construct represent genomic DNA from P. moriformis that enable targeted integration of the transforming DNA via homologous recombination at the FATA-1 locus. Proceeding in the 5′ to 3′ direction, the C. reinhardtii TUB2 promoter driving the expression of the S. cerevisiae SUC2 gene (encoding sucrose hydrolyzing activity, thereby permitting the strain to grow on sucrose) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for SUC2 are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR of the C. vulgaris nitrate reductase (NR) gene is indicated by small capitals, followed by a spacer region indicated by lowercase text. The P. moriformis AMT3 promoter, indicated by lowercase boxed text, drives expression of the P. moriformis KASII gene. The region encoding the plastid targeting peptide from Chlorella protothecoides SAD1 is indicated by uppercase italics. The sequence that encodes the mature P. moriformis KASII polypeptide is indicated with bold, underlined, uppercase italics, while a 3×FLAG epitope encoding sequence is in bold italics. A second C. vulgaris NR3′ UTR is indicated by small capitals. A second C. reinhardtii TUB2 promoter sequence, indicated by lowercase boxed text, drives expression of the P. moriformis FAD2 hairpin A sequence. The sense and antisense strands are indicated with uppercase, bold italics, and are separated by the FAD2 intron and the first 10 bases of the FAD2 second exon (uppercase italics). A third C. vulgaris NR3′ UTR is indicated by small capitals, followed by a second spacer region that is indicated by lowercase text.
Nucleotide sequence of the transforming DNA from pSZ2419:








(SEQ ID NO: 96)



gctcttcggagtcactgtgccactgagttcgactggtagctgaatggagtcgctgctccactaaacgaattgtcagcaccgccagccggc



 


cgaggacccgagtcatagcgagggtagtagcgcgccatggcaccgaccagcctgcttgccagtactggcgtctcttccgcttctctgtgg


 


tcctctgcgcgctccagcgcgtgcgcttttccggtggatcatgcggtccgtggcgcaccgcagcggccgctgcccatgcagcgccgctgc


 


ttccgaacagtggcggtcagggccgcacccgcggtagccgtccgtccggaacccgcccaagagttttgggagcagcttgagccctgcaag


 


atggcggaggacaagcgcatcttcctggaggagcaccggtgcgtggaggtccggggctgaccggccgtcgcattcaacgtaatcaatcgc


 


atgatgatcagaggacacgaagtcttggtggcggtggccagaaacactgtccattgcaagggcatagggatgcgttccttcacctctcat


 








ccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatgaacgaccccaacggcctgtggtacgacg


 


agaaggacgccaagtggcacctgtcttccagtacaacccgaacgacaccgtctgggggacgcccttgttctggggccacgccacgtccga


 


cgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgccttctccggctccatggtggtggacta


 


caacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatctggacctacaacaccccggagtccgagga


 


gcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaaccccgtgctggccgccaactccacccagttccg


 


cgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtcccaggactacaagatcgagatctactcctc


 


cgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttcctcggctaccagtacgagtgccccggcctgatcgaggt


 


ccccaccgagcaggaccccagcaagtcctactgggtgatgttcatctccatcaaccccggcgccccggccggcggctccttcaaccagta


 


cttcgtcggcagcttcaacggcacccacttcgaggccttcgacaaccagtcccgcgtggtggacttcggcaaggactactacgccctgca


 


gaccttcttcaacaccgacccgacctacgggagcgccctgggcatcgcgtgggcctccaactgggagtactccgccttcgtgcccaccaa


 


cccctggcgctcctccatgtccctcgtgcgcaagttctccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaa


 


ggccgagccgatcctgaacatcagcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgt


 


cgacctgtccaacagcaccggcaccctggagttcgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgttcgcgga


 


cctctccctctggttcaagggcctggaggaccccgaggagtacctccgcatgggcttcgaggtgtccgcgtcctccttcttcctggaccg


 


cgggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtgaacaaccagcccttcaagagcgagaacga


 


cctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacgacggcgacgtcgtgtccaccaacaccta


 


cttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgttctacatcgacaagttccaggtgcgcga


 


ggtcaagTGAcaattgGCAGCAGCAGCTCGGATAGTATCGACACACTCTGGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCT


 


GCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTG


 


CTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTG


 


CTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCT


 


GTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAggatcccgcgtctcgaacagagcgcgcagagg


 


aacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcgcttggttcttcgtccattagc


 


gaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatggtcgaaacgttcacagcctagg


 








GGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGT


 


GTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCA


 


TATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCC


 


TTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAAC


 








TGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTGTGTGTA


 


CGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCATCCCAA


 


CCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGCTCCGCC


 


TGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAaagctgta


 


ttgttttccagaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaaga


 


cagggtggttggctggatggggaaacgctggtcgcgggattcgatcctgctgcttatatcctccctggaagcacacccacgactctgaag


 


aagaaaacgtgcacacacacaacccaaccggccgaatatttgcttccttatcccgggtccaagagagactgcgatgcccccctcaatcag


 


catcctcctccctgccgcttcaatcttccctgcttgcctgcgcccgcggtgcgccgtctgcccgcccagtcagtcactcctgcacaggcc


 


ccttgtgcgcagtgctcctgtaccctttaccgctccttccattctgcgaggccccctattgaatgtattcgttgcctgtgtggccaagcg


 


ggctgctgggcgcgccgccgtcgggcagtgctcggcgactttggcggaagccgattgttcttctgtaagccacgcgcttgctgctttggg


 


aagagaagggggggggtactgaatggatgaggaggagaaggaggggtattggtattatctgagttgggtgaagagc






Identification and Analysis of FATA-1 Knockout, KASII Over-Expression and FAD2 RNAi Strains: Construct D1358, derived from pSZ2419, was transformed into Strain J as described previously. Primary transformants were clonally purified and grown under standard lipid production conditions at pH 5. The resulting fatty acid profiles from representative clones arising from transformation of Strain J with D1358 are summarized in Table 45, below. The P. moriformis AMTS promoter is repressed at pH 5 so the observed phenotypes did not reflect over-expression of P. moriformis KASII. Nevertheless, we observed that multiple strains had substantially reduced levels of C16:0 and 10-15% increases in C18:1, suggesting that the construct had disrupted the FATA-1 target gene, increasing the amount of palmitoyl-ACP available for extension by endogenous KASII. One line, D1358-13, was selected for further analysis. D1358-13 accumulated  ̃17% C16:0,  ̃75% C18:1 and less than 2% C18:2, indicating that we had successfully integrated at FATA-1 and down-regulated activity of the FAD2 Δ12-desaturase in this strain.







TABLE 45







Fatty acid profiles of D1358 [pSZ2419] primary transformants, compared to the wild-type parental strain, Strain J.


















Strain
J
D1358-13
D1358-19
D1358-11
D1358-9
D1358-30
D1358-28
D1358-6
D1358-8
D1358-10
D1358-3






















Fatty 
C12:0
0.05
0.08
0.06
0.08
0.06
0.07
0.07
0.09
0.07
0.08
0.10


Acid
C14:0
1.32
0.79
0.83
0.85
0.87
0.84
0.91
0.86
0.89
0.92
0.60


Area %
C16:0
26.66
17.43
18.84
20.03
16.27
18.4
19.1
18.18
15.6
16.42
11.24



C16:1
0.84
0.74
0.79
0.97
0.60
0.77
1.17
0.75
0.56
0.61
0.57



C18:0
3.10
2.87
2.97
2.36
3.20
2.67
2.10
2.82
3.22
3.19
2.30



C18:1
59.07
74.78
69.54
68.78
71.48
69.55
69.02
68.93
70.44
69.64
75.27



C18:2
7.39
1.97
5.47
5.61
6.22
6.31
6.42
6.8
7.68
7.78
8.51



C18:3α
0.55
0.23
0.59
0.51
0.26
0.39
0.46
0.38
0.24
0.27
0.24



C20:0
0.24
0.22
0.20
0.13
0.32
0.20
0.03
0.20
0.33
0.31
0.22



C20:1
0.11
0.40
0.29
0.37
0.23
0.33
0.33
0.39
0.36
0.27
0.40



C22:0
0.11
0.09
0.08
0.07
0.09
0.08
0.08
0.08
0.09
0.11
0.11


















sum C18
70.11
79.85
78.57
77.26
81.16
78.92
78.00
78.93 
81.58
80.88
86.32


saturates
31.48
21.48
22.98
23.52
20.81
22.26
22.29
22.23 
20.20
21.03
14.57


unsaturates
67.96
78.12
76.68
76.24
78.79
77.35
77.4
77.25 
79.28
78.57
84.99









In Table 45, Oleate (C18:1) levels greater than the wild-type level are highlighted with bold text. Palmitate (C16:0) levels less than the wild-type are highlighted with bold text. Levels of linoleate (C18:2) reduced by 1% or more compared to the Strain J parent are highlighted with bold text.
The fatty acid profiles of strains derived from transformant D1358-13 were determined to be stable after more than 60 generations of growth in the absence of selection (growth on sucrose). The performance of selected strains in shake flask assays was then evaluated, and the fatty acid profiles and lipid titers are presented in Table 46, below. Flask experiments were performed at pH 7, enabling activation of the PmAMT3 promoter driving expression of the KASII transgene. The combination of KASII over-expression and FATA-1 knockout leads to further reductions in palmitate levels and enhanced oleate accumulation compared to the phenotypes observed at pH 5 (Table 45). With more than 82% C18:1, less than 11% C16:0, less than 2% C18:2 and  ̃83% of the wild-type lipid titer, Strain AAStrain AA was determined to be the most appropriate strain from this set to serve as a host strain for subsequent modifications to elevate stearate levels. DNA blot analysis showed that Strain AA has a simple insertion of construct D1358 1pSZ24191 at the FATA-1 locus.







TABLE 46







Fatty acid profiles and lipid titers of FATA-1 knockout, KASII over-expressing, FAD2 RNAi lines derived


from D1358-13 primary transformants, compared to the wild-type parental strain, Strain J.









Primary

T389; D1358-13





















Strain
J
AA
AB
AC
AD
AE
AF
AG
AH
AI
AJ
AK
AL
AM

























Fatty 
C12:0
0.05
0.08
0.09
0.11
0.19
0.11
0.14
0.10
0.12
0.08
0.11
0.09
0.20
0.20


Acid 
C14:0
1.34
0.96
0.98
1.03
1.04
0.96
1.02
0.98
1.03
0.98
1.01
1.00
1.03
1.02


Area 
C16:0
29.69
10.72
10.47
8.90
6.99
9.53
9.27
10.13
8.99
10.76
9.58
10.00
6.64
6.38


%
C16:1
0.88
0.42
0.39
0.31
0.29
0.39
0.37
0.41
0.32
0.40
0.35
0.35
0.27
0.27



C18:0
2.78
2.92
3.00
3.16
2.71
2.88
2.85
2.91
3.21
3.03
3.10
3.20
2.77
2.71



C18:1
58.45
82.08
82.24
83.66
85.49
83.28
83.38
82.57
83.51
82.12
83.10
82.63
85.88
86.13



C18:2
5.83
1.89
1.88
1.80
2.01
1.83
1.89
1.89
1.77
1.73
1.75
1.76
1.94
1.96



C18:3α
0.42
0.23
0.23
0.25
0.35
0.27
0.29
0.27
0.25
0.22
0.24
0.23
0.34
0.36



C20:0
0.17
0.15
0.16
0.17
0.15
0.15
0.16
0.16
0.17
0.14
0.16
0.16
0.15
0.15



C20:1
0.05
0.23
0.24
0.27
0.36
0.28
0.29
0.26
0.27
0.21
0.25
0.24
0.38
0.39





















sum C18
67.48
87.12
87.35
88.87
90.56
88.26
88.41
87.64
88.74
87.10
88.19
87.82
90.93
91.16


saturates
34.03
14.83
14.70
13.37
11.08
13.63 
13.44
14.28
13.52
14.99
13.96
14.45
10.79
10.46


unsaturates
65.63
84.85
84.98
86.29
88.50
86.05
86.22
85.40
86.12
84.68
85.69
85.21
88.81
89.11


lipid titer 
100.0
82.8
81.1
72.8
54.4
68.3
63.7
70.6
72.2
106.9
76.5
77.5
56.7
54.6


(% parent) 























In Table 46, Stearate (C18:1) levels greater than the wild-type level are highlighted with bold text. Palmitate (C16:0) levels lower than the wild-type are highlighted with bold text. Linoleate (C18:2) levels that are lower than the wild-type are indicated with bold text.
Constructs Used for SAD2 Knockout/RNAi in Strain AA: Two DNA constructs, pSZ2283 and pSZ2697, were made to simultaneously disrupt the SAD2-1 allele and express a SAD2 hairpin construct in Strain AA. In each construct, the neoR gene from transposon Tn5, conferring resistance to aminoglycoside antibiotics, was used as a selectable marker for transformation. The sequence of the transforming DNA derived from pSZ2283 is provided immediately below. Relevant restriction sites are indicated in lowercase, bold, and are from 5′-3′ BspQI, KpnI, XbaI, MfeI, BamHI, AvrII, EcoRV, EcoRI, SpeI, BamHI, HinDIII, and SacI, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Underlined sequences at the 5′ and 3′ flanks of the construct represent genomic DNA from P. moriformis that enable targeted integration of the transforming DNA via homologous recombination at the SAD2-1 locus. Proceeding in the 5′ to 3′ direction, the Chlamydomonas reinhardtii TUB2 promoter driving the expression of neoR (encoding aminoglycoside phosphotransferase activity, thereby permitting the strain to grow on G418) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for neoR are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The 3′ UTR of the C. vulgaris NR gene is indicated by small capitals, followed by a spacer region indicated by lowercase text. A second C. reinhardtii TUB2 promoter sequence, indicated by lowercase boxed text, drives expression of the SAD2 hairpin C sequence. The sense and antisense strands are indicated with uppercase, bold italics, and are separated by the P. moriformis FAD2 intron and the first 10 bases of the FAD2 second exon (uppercase italics). A second C. vulgaris NR3′ UTR is indicated by small capitals.
Nucleotide sequence of the transforming DNA from pSZ2283:








(SEQ ID NO: 97)



gctcttcgggtcgccgcgctgcctcgcgtcccctggtggtgcgcgcggtcgccagcgaggccccgctgggcgttccgccctcggtgcagc



 


gcccctcccccgtggtctactccaagctggacaagcagcaccgcctgacgcccgagcgcctggagctggtgcagagcatggggcagtttg


 


cggaggagagggtgctgcccgtgctgcaccccgtggacaagctgtggcagccgcaggactttttgcccgaccccgagtcgcccgacttcg


 


aggatcaggtggcggagctgcgcgcgcgcgccaaggacctgcccgacgagtactttgtggtgctggtgggggacatgatcacggaggagg


 


cgctgccgacctacatggccatgctcaacacgctggacggcgtgcgcgacgacacgggcgcggccgaccacccgtgggcgcgctggacgc


 


ggcagtgggtggccgaggagaaccggcacggcgacctgctgaacaagtactgctggctgacggggcgcgtcaacatgcgggccgtggagg


 


tgaccatcaacaacctgatcaagagcggcatgaacccgcagacggacaacaaccttatttggggttcgtctacacctccttccaggagcg


 








ctccacgccggctcccccgccgcctgggtggagcgcctgttcggctacgactgggcccagcagaccatcggctgctccgacgccgccgtg


 


ttccgcctgtccgcccagggccgccccgtgctgttcgtgaagaccgacctgtccggcgccctgaacgagctgcaggacgaggccgcccgc


 


ctgtcctggctggccaccaccggcgtgccctgcgccgccgtgctggacgtggtgaccgaggccggccgcgactggctgctgctgggcgag


 


gtgcccggccaggacctgctgtcctcccacctggcccccgccgagaaggtgtccatcatggccgacgccatgcgccgcctgcacaccctg


 


gaccccgccacctgccccttcgaccaccaggccaagcaccgcatcgagcgcgcccgcacccgcatggaggccggcctggtggaccaggac


 


gacctggacgaggagcaccagggcctggcccccgccgagctgttcgcccgcctgaaggcccgcatgcccgacggcgaggacctggtggtg


 


acccacggcgacgcctgcctgcccaacatcatggtggagaacggccgcttctccggcttcatcgactgcggccgcctgggcgtggccgac


 


cgctaccaggacatcgccctggccacccgcgacatcgccgaggagctgggcggcgagtgggccgaccgcttcctggtgctgtacggcatc


 


gccgcccccgactcccagcgcatcgccttctaccgcctgctggacgagttcttcTGAcaattgGCAGCAGCAGCTCGGATAGTATCGACA


 


CACTCTGGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCT


 


CAGTGTGTTTGATCTTGTGTGTACGCGTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCG


 


TTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCA


 


CAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATG


 


GGAACACAAATGGAggatcccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcataca


 


ccacaataaccacctgacgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcagg


 








AGCAGCTCGGATAGTATCGACACACTCTGGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCC


 


TGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACC


 


ACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCT


 


GCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCT


 


GATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAaagctggagctccagccacggcaacaccgcgcgccttgcggccgagcacggcg


 


acaagaacctgagcaagatctgcgggctgatcgccagcgacgagggccggcacgagatcgcctacacgcgcatcgtggacgagttcttcc


 


gcctcgaccccgagggcgccgtcgccgcctacgccaacatgatgcgcaagcagatcaccatgcccgcgcacctcatggacgacatgggcc


 


acggcgaggccaacccgggccgcaacctcttcgccgacttctccgcggtcgccgagaagatcgacgtctacgacgccgaggactactgcc


 


gcatcctggagcacctcaacgcgcgctggaaggtggacgagcgccaggtcagcggccaggccgccgcggaccaggagtacgtcctgggcc


 


tgccccagcgcttccggaaactcgccgagaagaccgccgccaagcgcaagcgcgtcgcgcgcaggcccgtcgccttctcctggatctccg


 


ggcgcgagatcatggtctagggagcgacgagtgtgcgtgcggggctggcgggagtgggacgccctcctcgctcctctctgttctgaacgg


 


aacaatcggccaccccgcgctacgcgccacgcatcgagcaacgaagaaaaccccccgatgataggttgcggtggctgccgggatatagat


 


ccggccgcacatcaaagggcccctccgccagagaagaagctcctttcccagcagactcctgaagagc






The sequence of the transforming DNA derived from pSZ2697 is provided immediately below. Relevant restriction sites are indicated in lowercase, bold, and are from 5′-3′ NsiI, SpeI, BamHI, HinDIII, SacII, EcoRV, KpnI, XbaI, MfeI, BamHI, AvrII, EcoRV, EcoRI and XbaI, respectively. Underlined sequences at the 5′ and 3′ flanks of the construct represent genomic DNA from P. moriformis that enable targeted integration of the transforming DNA via homologous recombination at the SAD2-1 locus. Proceeding in the 5′ to 3′ direction, the SAD2 hairpin C sense and antisense strands are indicated with uppercase, bold italics, and are separated by the P. moriformis FAD2 intron and the first 10 bases of the FAD2 second exon (uppercase italics). The 3′ UTR of the C. vulgaris NR gene is indicated by small capitals. The Chlorella sorokiniana Glutamate Dehydrogenase (GDH) promoter, driving the expression of neoR (encoding aminoglycoside phosphotransferase activity, thereby permitting the strain to grow on G418) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for neoR are indicated by uppercase italics, while the coding region is indicated with lowercase italics. A second C. vulgaris NR3′ UTR is indicated by small capitals, followed by a spacer region indicated by lowercase text.
Nucleotide sequence of the transforming DNA from pSZ2697:








(SEQ ID NO: 98)



atgcatgccggtcaccacccgcatgctcgtactacagcgcacgcaccgcttcgtgatccaccgggtgaacgtagtcctcgacggaaacat



 


ctggttcgggcctcctgcttgcactcccgcccatgccgacaacctttctgctgttaccacgacccacaatgcaacgcgacacgaccgtgt


 


gggactgatcggttcactgcacctgcatgcaattgtcacaagcgcttactccaattgtattcgtttgttttctgggagcagttgctcgac


 


cgcccgcgtcccgcaggcagcgatgacgtgtgcgtggcctgggtgtttcgtcgaaaggccagcaaccctaaatcgcaggcgatccggaga


 


ttgggatctgatccgagtttggaccagatccgccccgatgcggcacgggaactgcatcgactcggcgcggaacccagctttcgtaaatgc


 


cagattggtgtccgatacctggatttgccatcagcgaaacaagacttcagcagcgagcgtatttggcgggcgtgctaccagggttgcata


 


cattgcccatttctgtctggaccgctttactggcgcagagggtgagttgatggggttggcaggcatcgaaacgcgcgtgcatggtgtgcg


 


tgtctgttttcggctgcacgaattcaatagtcggatgggcgacggtagaattgggtgtggcgctcgcgtgcatgcctcgccccgtcgggt


 








GTGTGATGGACTGTTGCCGCCACACTTGCTGCCTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTG


 


TGTGTACGCGCTTTTGCGAGTTGCTAGCTGCTTGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCA


 


TCCCAACCGCAACTTATCTACGCTGTCCTGCTATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGC


 


TCCGCCTGTATTCTCCTGGTACTGCAACCTGTAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAAA


 








actgggcccagcagaccatcggctgctccgacgccgccgtgttccgcctgtccgcccagggccgccccgtgctgttcgtgaagaccgacc


 


tgtccggcgccctgaacgagctgcaggacgaggccgcccgcctgtcctggctggccaccaccggcgtgccctgcgccgccgtgctggacg


 


tggtgaccgaggccggccgcgactggctgctgctgggcgaggtgcccggccaggacctgctgtcctcccacctggcccccgccgagaagg


 


tgtccatcatggccgacgccatgcgccgcctgcacaccctggaccccgccacctgccccttcgaccaccaggccaagcaccgcatcgagc


 


gcgcccgcacccgcatggaggccggcctggtggaccaggacgacctggacgaggagcaccagggcctggcccccgccgagctgttcgccc


 


gcctgaaggcccgcatgcccgacggcgaggacctggtggtgacccacggcgacgcctgcctgcccaacatcatggtggagaacggccgct


 


tctccggcttcatcgactgcggccgcctgggcgtggccgaccgctaccaggacatcgccctggccacccgcgacatcgccgaggagctgg


 


gcggcgagtgggccgaccgcttcctggtgctgtacggcatcgccgcccccgactcccagcgcatcgccttctaccgcctgctggacgagt


 


tcttcTGAcaattgGCAGCAGCAGCTCGGATAGTATCGACACACTCTGGACGCTGGTCGTGTGATGGACTGTTGCCGCCACACTTGCTGC


 


CTTGACCTGTGAATATCCCTGCCGCTTTTATCAAACAGCCTCAGTGTGTTTGATCTTGTGTGTACGCGCTTTTGCGAGTTGCTAGCTGCT


 


TGTGCTATTTGCGAATACCACCCCCAGCATCCCCTTCCCTCGTTTCATATCGCTTGCATCCCAACCGCAACTTATCTACGCTGTCCTGCT


 


ATCCCTCAGCGCTGCTCCTGCTCCTGCTCACTGCCCCTCGCACAGCCTTGGTTTGGGCTCCGCCTGTATTCTCCTGGTACT6GCAACCTG


 


TAAACCAGCACTGCAATGCTGATGCACGGGAAGTAGTGGGATGGGAACACAAATGGAggatcccgcgtctcgaacagagcgcgcagagga


 


acgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcgcttggttcttcgtccattagcg


 


aagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatggtcgaaacgttcacagcctaggg


 


atatcgaattccgggtcgccgcgctgcctcgcgtcccctggtggtgcgcgcggtcgccagcgaggccccgctgggcgttccgccctcggt


 


gcagcgcccctcccccgtggtctactccaagctggacaagcagcaccgcctgacgcccgagcgcctggagctggtgcagagcatggggca


 


gtttgcggaggagagggtgctgcccgtgctgcaccccgtggacaagctgtggcagccgcaggactttttgcccgaccccgagtcgcccga


 


cttcgaggatcaggtggcggagctgcgcgcgcgcgccaaggacctgcccgacgagtactttgtggtgctggtgggggacatgatcacgga


 


ggaggcgctgccgacctacatggccatgctcaacacgctggacggcgtgcgcgacgacacgggcgcggccgaccacccgtgggcgcgctg


 


gacgcggcagtgggtggccgaggagaaccggcacggcgacctgctgaacaagtactgctggctgacggggcgcgtcaacatgcgggccgt


 


ggaggtgaccatcaacaacctgatcaagagcggcatgaacccgcagacggacaacaacccttatttggggttcgtctacacctccttcca


 


ggagcgcgccaccaagtatctaga






Identification and Analysis of SAD2 Knockout/Knockdown Strains in the Strain AA Background: Constructs D1639, derived from pSZ2697, and D1682, derived from pSZ2283, were transformed into Strain AA as described previously. Primary transformants were clonally purified and grown under standard lipid production conditions at pH 7. The resulting fatty acid profiles from representative clones arising from transformation are summarized in Table 47, below. D1639 transformants accumulated up to 56% C18:0, and D1682 transformants accumulated a maximum of about 35% C18:0. Most of the increases in stearate came at the expense of C18:1, indicating that SAD activity was significantly reduced by the SAD2 knockout/RNAi constructs in these strains. C16:0 levels varied from 6% to 14%; C18:2 ranged from 2-5%. Most strains maintained the low C16:0 and C18:2 phenotypes of the Strain AA parent. These fatty acid profiles demonstrate that down-regulating SAD2 expression using knockout/RNAi constructs, in a background with disrupted FATA-1, KASII over-expression and FAD2 RNAi, produces strains with high C18:0, low C16:0 and low C18:2 phenotypes. These strains will be useful for production of high stability, high stearate, high oleic oils, and oils which have high SOS content.







TABLE 47







Fatty acid profiles of D1639 [pSZ2697] and D1682 [pSZ2283] primary transformants, 


compared to the wild-type strain, Strain J, and the Strain AA parental base strain.

















Strain
J
AA
D1682-4
D1682-17
D1682-7
D1682-6
D1639-2
D1639-5
D1639-10
D1639-19





















Fatty 
C12:0
0.04
0.11
0.14
0.10
0.32
0.31
0.00
0.19
0.17
0.00


Acid
C14:0
1.29
0.98
1.03
0.94
1.11
1.15
1.64
1.39
1.61
1.02


Area %
C16:0
27.50
7.75
8.68
10.41
5.70
5.96
7.54
9.90
14.39
12.02



C16:1
0.71
0.30
0.06
0.07
0.07
0.10
0.00
0.00
0.00
0.00



C18:0
3.28
3.60
35.46
29.92
24.66
22.30
55.96
53.38
43.46
37.30



C18:1
57.80
84.14
48.39
52.49
61.04
63.60
23.70
26.79
32.93
42.81



C18:2 
7.90 
2.09
2.37
2.36
3.03
2.88
5.09
3.50
3.22
2.79



C18:3α
0.57 
0.32
0.50
0.65
0.66
0.58
1.59
0.98
1.01
0.85



C20:0
0.28
0.23
2.07
1.87
1.75
1.51
3.04
2.73
2.29
2.22



C20:1 
0.18
0.35
0.54
0.49
0.78
0.83
0.37
0.33
0.30
0.40



C22:0 
0.06
0.02
0.27
0.27
0.23
0.20
0.43
0.36
0.29
0.29



C24:0 
0.09 
0.02
0.33
0.26
0.34
0.26
0.64
0.45
0.32
0.31

















sum C18
69.55
90.14
86.72
85.42
89.39
89.36
86.34
84.65
80.62
83.75


saturates
32.54
12.70
47.98
43.77
34.11
31.69
69.25
68.40
62.53
53.16


unsaturates
67.16
87.21
51.86
56.06
65.58
67.99
30.75
31.60
37.46
46.85









In Table 47, Stearate (C18:0) levels greater than the wild-type level are highlighted with bold text. Oleate (C18:1) levels that are higher than in the wild-type are indicated with bold text. Palmitate (C16:0) levels less than the wild-type level are highlighted with bold. Reduced levels of linoleate (C18:2) compared to the wild-type are highlighted with bold text.
Stable lines were isolated from a number of D1639 and D1682 transformants. Shake flask assays were carried out to evaluate the performance of four lines derived from D1639-5. Fatty acid profiles and relative lipid titers from the biomass are shown in Table 48, below.







TABLE 48







Shake flask assays of strains derived from D1639-5, expressing SAD2hpC, 


driven by the CrTUB2 promoter, targeted to the SAD2-1 locus.










Primary


T530; D1639-5













Strain
J
AA
AW
AX
AY
BL

















Fatty 
C10:0
0.01
0.00
0.07
0.08
0.05
0.04


Acid 
C12:0
0.02
0.11
0.19
0.22
0.25
0.23


Area %
C14:0
1.52
1.10
1.35
1.32
1.30
1.43



C16:0
31.61
9.59
9.28
8.44
7.74
9.46



C16:1
1.04
0.34
0.03
0.02
0.01
0.01



C17:0
0.10
0.11
0.10
0.10
0.10
0.09



C18:0
2.98
4.36
53.01
53.52
55.32
52.09



C18:1
54.81
80.84
27.26
27.52
27.42
28.06



C18:2
6.88
2.42
3.55
3.52
2.38
3.45



C18:3α
0.53
0.33
0.97
1.03
0.82
1.06



C20:0
0.26
0.31
2.88
2.94
3.15
2.72



C20:1
0.05
0.34
0.38
0.38
0.40
0.37



C22:0
0.03
0.06
0.36
0.37
0.39
0.35



C24:0
0.07
0.08
0.53
0.54
0.53
0.60













sum C18
65.19
87.95
84.79
85.58
85.94
84.66


saturates
36.59
15.70
67.76
67.52
68.82
66.99


unsaturates
63.30
84.26
32.19 
32.46
31.02
32.95


% wild-type 
100.0
70.3
34.8
33.7
31.4
35.3


lipid titer









In Table 48, Strain AA is the parent strain; Strain J is the wild-type base strain. Stearate (C18:0) levels higher than in the wild-type strain are indicated with bold. Bold text indicates the increased level of oleate (C18:1) in Strain AA compared to the wild-type. Palmitate (C16:0) levels that are less than in the wild-type are highlighted bold. Linoleate (C18:2) levels that are less than in the wild-type are indicated with bold.
Lab scale oils were prepared from biomass collected from the Strains AW, AX and AY shake flasks. The TAG compositions of these oils were determined by LC/MS, and are shown in FIG. 21. SOS accumulation ranged from 42-47% in these strains. POS was the next most abundant TAG, at 16-17%. Linoleate-containing TAGs were reduced by more than 50% compared to the Strain AU and AV oils, described above. Strains AW, AX, and AY oils contained 12-13% trisaturated TAGs (S—S—S), similar to the amounts that accumulated in the Strains AU and AX oils. Modulation of SAD activity during oil production to prevent overproduction of saturated fatty acids may help to reduce accumulation of trisaturates.
Example 49
Properties of Methyl Oleate from High Oleic Microalgal Oils
Esterified oils high in methyl oleate are useful in a variety of applications such as cleaning and lubrication of machinery. For some of these applications, high thermal stability is desired. Thermal stability testing was performed on methylated oil prepared from high-oleic and high-stability-high oleic triglyceride oils prepared from heterotrophically grown oleaginous microalgae as described above. The oils were bleached and deodorized prior to methylation. Commercially available soya methyl ester was used as a control.
High Oleic (HO) oil was prepared from a high oil-yielding strain of Prototheca moriformis transformed with a plasmid that can be described as FatA1_Btub:inv:nr::amt03-CwTE2:nr_FatA1. This plasmid was designed to homologously recombine in the FATA1 chromosomal site, thus ablating a FATA acyl-ACP thioesterase chromosomal allele, while expressing an exogenous acyl-ACP thioesterase from Cuphea. wrightii (CwTE2, SEQ ID NO: 11) under control of the pH-regulatable amt3 promoter. The CwTE2 gene can be downregulated by cultivation at pH 5 during oil production to further elevate oleate production. Sucrose invertase was also expressed as a selection marker and to allow for cultivation of the strain on sucrose as a sole carbon source. The 3′ UTR sequences are from the Chlorella vulgaris nitrate reductase gene. The resulting HO strain is denoted Stain Q. The fatty acid profile of the oil produced by Strain Q is listed below in Table 49.







TABLE 49







Fatty acid profile of high oleic oil from Strain Q.










Fatty Acid
Area %














C10
0.01



C12:0
0.03



C14:0
0.43



C15:0
0.03



C16:0
7.27



C16:1 iso
0.81



C16:1
0.689



C17:0
0.06



C18:0
1.198



C18:1
80.15



C18:1 iso
0.08



C18:2
8.38



C18:3 ALPHA
0.25



C20:0
0.02



C20:1
0.38



C22:0
0.04



C24:0
0.03










A high-stability-high-oleic oil (HSAO) was also prepared from a high oil-yielding strain of Prototheca moriformis transformed with a plasmid that can be described as FADc5′_Btub:inv:nr::btub-CpSAD_CtOTE:nr_FADc3′ (pSZ1501, SEQ ID NO:111). The resulting strain (Strain R) expresses sucrose invertase as a selectable marker and to allow for cultivation on sucrose as a sole carbon source. In addition, a FAD allele (encoding fatty acid desaturase responsible for the conversion of oleate to linoleate) is disrupted and an oleate-specific acyl-ACP thioesterase (Carthamus tinctorius OTE, see example 5) fused to the transit peptide from the SAD gene of Chlorella protothecoides is expressed under control of the beta tubulin promoter. The 3′ UTR sequences are from the Chlorella vulgaris nitrate reductase gene. The fatty acid profile of the oil produced by Strain R after heterotrophic cultivation is listed below in Table 50. The fatty acid profile has greater than 85% oleate yet almost none of the major polyunsaturates, linoleic and linolenic acids.







TABLE 50







Fatty acid profile of high oleic oil from Strain R.










Fatty Acid
Area %














C10
0.02



C12:0
0.07



C14:0
0.09



C15:0
0.05



C16:0
7.28



C16:1
0.70



C17:0
0.08



C18:0
2.15



C18:1
86.32



C20:0
0.30



C20:1
0.46



C22:0
0.08



C23:0
0.01



C24:0
0.06










The HO and HSAO oils were methylated by known biodiesel production techniques to make methyl-HO and methyl-HSAO esters. These methyl esters where then subjection to thermal testing according to the following procedure:

    
    
        1. Prepare equipment as shown in FIG. 1.
        2. Add 1 liter of water to test vessel and bring to an active boil on the hotplate.
        3. To each test product add 50 ppm Cobalt (0.083 g of 6% Cobalt Napthenate in 100.0 gram sample) and mix thoroughly.
        4. Weigh out, in a watch glass, 7.0 g of 100% cotton gauze, (#50 Cheese Cloth).
        5. Evenly distribute 14.0 g of test product, as prepared in step 3, onto the gauze.
        6. Place thermocouple (thermometer) through the center of #15 stopper. Wrap cotton around thermocouple.
        7. Place wrapped cotton into 24 mesh wire frame cylinder so that it occupies the upper 41⁄2 inches.
        8. Position cylinder with wrapped gauze into the 1 L tall form beaker. Secure the beaker in the boiling water and begin recording the temperature increase with time.
        9. Continue monitoring the temperature for 2 hours or until a 10 degree temperature drop in observed.
        10. Plot temperature vs time on a graph.
        11. Any sample which shows a temperature exceeding 100 degrees C. in 1 hour or 200 degrees C. in 2 hours should be regarded as a dangerous oxidation risk or one that is likely to spontaneously combust.
    
    


Results: The HO and HSAO methyl ester did not exhibit auto-oxidation as evidenced by a temperature rise. The control soya methyl ester sample did exhibit the potential for auto-oxidation. The time-temperature profiles are shown in FIG. 18.
In addition, methylated fatty acid from oil produced by Strain Q was found to have the following characteristics:

    
    
        Flash Point (ASTM D93) of 182° C.
        Non-VOC
        Kauri Butanol value (ASTM D1133) of 53.5
        Viscosity at 40° C. (ASTM D445) of 4.57 mm2/s
        Acid Number (ASTM D664) of 0.17 mg KOH/g
        Boiling range distribution (ASTM D2887) 325-362° C.
    
    


Example 50
Further Properties of High Oleic (HO) and High-Stability-High-Oleic (HSAO) Microalgal Oils
The high oleic oil and the high-stability high-oleic algal oils can have the properties shown in FIG. 19 or these values ±20% for the measured parameters.
In one experiment, HSAO microalgal oil showed 512 hour stability measured by OSI at 110° C. (estimated using 130° C. data) with antioxidants of 0.5% phenyl-alpha-naphthylamine (PANA) and 500 ppm ascorbyl palmitate (AP).
Example 51
Production of Low Saturate Oil by Conversion of Palmitic to Palmitoleate
As described in the examples above, genetic manipulation of microalgae can decrease saturated fat levels, especially by increasing the production of oleic acid. However, in some cases, the acyl-ACP thioesterases expressed in the oleaginous cell liberate more than desirable amounts of palmitate. Here, we describe methods for converting palmitate (16:0) to palmitoleate (16:1) by overexpressing a palmitoyl-ACP desaturase (PAD) gene. The PAD gene can be obtained from natural sources such as Macfadyena unguis (Cat's claw), Macadamia integrifolia (Macadamia nut), Hippophae rhamnoides (sea buckthorn), or by creating a PAD via mutation of a stearoyl-ACP desaturase to have 16:1 activity. The Macfadyena unguis desaturase is denoted (MuPAD).
A high-oil-producing strain of Prototheca moriformis (Strain Z) is biolistically transformed with plasmid DNA constructs with a PAD gene. For example, one of the high oleic strains described in the Examples 6, 36, or 49 can further comprise an exogenous PAD gene. The constructs comprises sucrose invertase as a selectable marker and either the MuPAD or a SAD gene (e.g., Olea europaea stearoyl-ACP desaturase, GenBank Accession No. AAB67840.1) having the L118W mutation to shift substrate-specificity toward palmitate. See Cahoon, et al., Plant Physoil (1998) 117:593-598. Both the amt3 and beta tubulin (Btub) promoters are used. In addition, the native transit peptide of a plant PAD gene can be swapped with one known to be effective in microalgae (e.g., the transit peptide from the Chlorella vularis SAD gene).
The PAD gene can be expressed in a variety of strains including those with a FATA knockout or knockdown and/or a KASII knockin to produce high-oleic oil. Optionally, these strains can also produce high-stability (low polyunsaturate) oil by virtue of a FAD (delta 12 fatty acid desaturase) knockout, knockdown, or by placing FAD expression under control of a regulatable promoter and producing oil under conditions that downregulate FAD. In addition, useful base strains for the introduction of PAD gene activities might also include strains possessing KASII knockouts, and FATA Knockins, whereby levels of C16:0 palmitate are elevated.
As a result, lower levels of palmitic acid are found in the fatty acid profile of the microalgal oil as this is converted into cis-palmitoleic and cis-vaccenic acids. In some cases the total area percent of saturated fatty acids is less than equal to 3.5%, 3% or 2.5%.
Constructs for over expression of Macfadyena unguis C16:0 desaturase (MuPAD) follow:
1) pSZ3142: 6S::CrTUB2:ScSUC2:CvNR::PmAMT3:CpSADtp :MuPAD:CvNR::6S
Relevant restriction sites in the construct pSZ3142 6S::CrTUB2:ScSUC2:CvNR::PmAMT3:CpSADtp:MuPAD:CvNR::6S are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Asc I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA from that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene (conferring the ability of Strain Z to metabolize sucrose) is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by an endogenous amt03 promoter of Prototheca moriformis, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the MuPAD are indicated by uppercase, bold italics, while the remainder of the coding region is indicated by bold italics. The Chlorella protothecoides S106 stearoyl-ACP desaturase transit peptide is located between initiator ATG and the Asc I site. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ3142:








(SEQ ID NO: 99)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggcttttcgccgcgctcgtgcgcgtcgctgat



 


gtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggaggactcctg


 


gtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaactggtcctccag


 


cagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtacagaacaaccacgagccttgtctaggcagaa


 


tccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgccgcttctcccgcacgcttcttt


 


ccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagtcggggaactctgatcagtctaaac


 


ccccttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccaccccccacaccacctcctcccagaccaa


 


ttctgtcacctttttggcgaaggcatcggcctcggcctgcagagaggacagcagtgcccagccgctgggggttggcggatgcacgctcag


 








ccggcttcgccgccaagatcagcgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatga


 


acgaccccaacggcctgtggtacgacgagaaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacgc


 


ccttgttctggggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcg


 


ccttctccggctccatggtggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatct


 


ggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaaccccg


 


tgctggccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtccc


 


aggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttcctcggctacc


 


agtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggtgatgttcatctccatcaaccccggcg


 


ccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccacttcgaggccttcgacaaccagtcccgcgtggtgg


 


acttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgacctacgggagcgccctgggcatcgcgtgggcctccaact


 


gggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccctcgtgcgcaagttctccctcaacaccgagtaccaggcca


 


acccggagacggagctgatcaacctgaaggccgagccgatcctgaacatcagcaacgccggcccctggagccggttcgccaccaacacca


 


cgttgacgaaggccaacagctacaacgtcgacctgtccaacagcaccggcaccctggagttcgagctggtgtacgccgtcaacaccaccc


 


agacgatctccaagtccgtgttcgcggacctctccctctggttcaagggcctggaggaccccgaggagtacctccgcatgggcttcgagg


 


tgtccgcgtcctccttcttcctggaccgcgggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtga


 


acaaccagcccttcaagagcgagaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacg


 


acggcgacgtcgtgtccaccaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgt


 








gtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtg


 


tgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatc


 


ccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctc


 


cgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggat


 


cccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgac


 


gaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggag


 








ctctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctca


 


gtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgt


 


ttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcac


 


agccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgg


 


gaacacaaatggaaagcttaattaagagctcttgttttccagaaggagttgctccttgagcctttcattctcagcctcgataacctccaa


 


agccgctctaattgtggagggggttcgaatttaaaagcttggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgg


 


gaaaaggaccatcagctccaaaaaacttgccgctcaaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacatt


 


catattgtgacgcttgagcagtctgtaattgcctcagaatgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcg


 


aggacacccgccactcgtacagcagaccattatgctacctcacaatagttcataacagtgaccatatttctcgaagctccccaacgagca


 


cctccatgctctgagtggccaccccccggccctggtgcttgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatc


 


ccaccacccccgcgatgggaagaatctctccccgggatgtgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccatac


 


cacacaaatatccttggcatcggccctgaattccttctgccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgc


 


tccgagtccgcaaacccttgtcgcgtggcggggcttgttcgagcttgaagagc






2) pSZ3145: 6S::CrTUB2:ScSUC2:CvNR::PmAMT3:MuPAD:CvNR::6S
Relevant restriction sites in the construct pSZ3145 6S::CrTUB2:ScSUC2:CvNR::PmAMT3:MuPAD:CvNR::6S are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA from that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene (conferring the ability of Strain Z to metabolize sucrose) is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by an endogenous amt03 promoter of Prototheca moriformis, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the MuPAD are indicated by uppercase, bold italics, while the remainder of the coding region is indicated by bold italics. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ3145:








(SEQ ID NO: 100)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtcgctga



 


tgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggaggactcct


 


ggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaactggtcctcca


 


gcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtacagaacaaccacgagccttgtctaggcaga


 


atccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgccgcttctcccgcacgcttctt


 


tccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagtcggggaactctgatcagtctaaa


 


cccccttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccaccccccacaccacctcctcccagacca


 


attctgtcacctttttggcgaaggcatcggcctcggcctgcagagaggacagcagtgcccagccgctgggggttggcggatgcacgctca


 








gccggcttcgccgccaagatcagcgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatg


 


aacgaccccaacggcctgtggtacgacgagaaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacg


 


cccttgttctggggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggc


 


gccttctccggctccatggtggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatc


 


tggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaacccc


 


gtgctggccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtcc


 


caggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttcctcggctac


 


cagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggtgatgttcatctccatcaaccccggc


 


gccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccacttcgaggccttcgacaaccagtcccgcgtggtg


 


gacttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgacctacgggagcgccctgggcatcgcgtgggcctccaac


 


tgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccctcgtgcgcaagttctccctcaacaccgagtaccaggcc


 


aacccggagacggagctgatcaacctgaaggccgagccgatcctgaacatcagcaacgccggcccctggagccggttcgccaccaacacc


 


acgttgacgaaggccaacagctacaacgtcgacctgtccaacagcaccggcaccctggagttcgagctggtgtacgccgtcaacaccacc


 


cagacgatctccaagtccgtgttcgcggacctctccctctggttcaagggcctggaggaccccgaggagtacctccgcatgggcttcgag


 


gtgtccgcgtcctccttcttcctggaccgcgggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtg


 


aacaaccagcccttcaagagcgagaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaac


 


gacggcgacgtcgtgtccaccaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctg


 








tgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgt


 


gtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcat


 


cccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggct


 


ccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggagga


 


tcccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctga


 


cgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtgga


 








ggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgat


 


cttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgct


 


tgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggttt


 


gggctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatg


 


gaaagcttaattaagagctcttgttttccagaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaa


 


ttgtggagggggttcgaatttaaaagcttggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggacca


 


tcagctccaaaaaacttgccgctcaaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgac


 


gcttgagcagtctgtaattgcctcagaatgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgc


 


cactcgtacagcagaccattatgctacctcacaatagttcataacagtgaccatatttctcgaagctccccaacgagcacctccatgctc


 


tgagtggccaccccccggccctggtgcttgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatcccaccaccccc


 


gcgatgggaagaatctctccccgggatgtgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatat


 


ccttggcatcggccctgaattccttctgccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgc


 


aaacccttgtcgcgtggcggggcttgttcgagcttgaagagc






3) pSZ3137: 6S::CrTUB2:ScSUC2:CvNR::CrTUB2:CpSADtp :MuPAD:CvNR::6S
Relevant restriction sites in the construct pSZ3137 6S::CrTUB2:ScSUC2:CvNR::CrTUB2:CpSADtp:MuPAD:CvNR::6S are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Asc I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA from that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene (conferring the ability of Strain Z to metabolize sucrose) is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by C. reinhardtii (3-tubulin promoter, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the MuPAD are indicated by uppercase, bold italics, while the remainder of the coding region is indicated by bold italics. The Chlorella protothecoides S106 stearoyl-ACP desaturase transit peptide is located between initiator ATG and the Asc I site. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ3137:








(SEQ ID NO: 101)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtcgctga



 


tgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggaggactcct


 


ggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaactggtcctcca


 


gcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtacagaacaaccacgagccttgtctaggcaga


 


atccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgccgcttctcccgcacgcttctt


 


tccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagtcggggaactctgatcagtctaaa


 


cccccttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccaccccccacaccacctcctcccagacca


 


attctgtcacctttttggcgaaggcatcggcctcggcctgcagagaggacagcagtgcccagccgctgggggttggcggatgcacgctca


 








gccggcttcgccgccaagatcagcgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatg


 


aacgaccccaacggcctgtggtacgacgagaaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacg


 


cccttgttctggggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggc


 


gccttctccggctccatggtggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatc


 


tggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaacccc


 


gtgctggccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtcc


 


caggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttcctcggctac


 


cagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggtgatgttcatctccatcaaccccggc


 


gccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccacttcgaggccttcgacaaccagtcccgcgtggtg


 


gacttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgacctacgggagcgccctgggcatcgcgtgggcctccaac


 


tgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccctcgtgcgcaagttctccctcaacaccgagtaccaggcc


 


aacccggagacggagctgatcaacctgaaggccgagccgatcctgaacatcagcaacgccggcccctggagccggttcgccaccaacacc


 


acgttgacgaaggccaacagctacaacgtcgacctgtccaacagcaccggcaccctggagttcgagctggtgtacgccgtcaacaccacc


 


cagacgatctccaagtccgtgttcgcggacctctccctctggttcaagggcctggaggaccccgaggagtacctccgcatgggcttcgag


 


gtgtccgcgtcctccttcttcctggaccgcgggaacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtg


 


aacaaccagcccttcaagagcgagaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaac


 


gacggcgacgtcgtgtccaccaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctg


 








tgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgt


 


gtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcat


 


cccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggct


 


ccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggagga


 


tcccgcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctga


 


cgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtgga


 








cgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgc


 


gagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaacttat


 


ctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcct


 


ggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaaagcttaattaagagctct


 


tgttttccagaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaattt


 


aaaagcttggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccg


 


ctcaaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaattgc


 


ctcagaatgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacagcagaccatta


 


tgctacctcacaatagttcataacagtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtggccaccccccggccc


 


tggtgcttgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatcccaccacccccgcgatgggaagaatctctccc


 


cgggatgtgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatatccttggcatcggccctgaatt


 


ccttctgccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgcaaacccttgtcgcgtggcggg


 


gcttgttcgagcttgaagagc






Example 52
Myristate Rich Oil Produced by Overexpressing a Cuphea palustris Thioesterase
Here, we demonstrate that over expression of a Cuphea palustris thioesterase (Cpal FATB2, accession AAC49180) in UTEX1435 results in a large increase in C14:0 production (over 60% of the fatty acid profile).
Constructs used for the overexpression of the Cpal FATB2 gene were codon optimized for expression in P. moriformis as described herein. Cuphea palustris FATB2 is a C14 preferring thioesterase. Two constructs, both encoding the Cpal FATB2 gene, were prepared. The first construct, pSZ2479, can be written as 6SA::CrTUB2-ScSUC2-CvNR:PmAMT3-CpSAD1tpExt-CpalFATB2ExtA-CvNR::6SB. The FatB2 coding sequence is given as SEQ ID NO: 86 and the amino acid sequence is given as SEQ ID NO: 87. The second construct, pSZ2480 can be written as 6SA::CrTUB2-ScSUC2-CvNR:PmAMT3-CpSAD1tpExt_CpalFATB2FLAG_ExtA-CvNR::6SB. The nucleic acid sequence and amino acid sequence are given as SEQ ID NO: 88 and SEQ ID NO: 89.
P. moriformis transformed with pSZ2480 produced high levels of myristic acid. The myristate content was 65.70 percent. This is a very large increase when compared to the myristate content of the wild-type oil produced by the base strain, which has a myristate content of approximately 1%.
The fatty acid profile of the high myristate strain is shown in the Table 51 below.







TABLE 51







Fatty acid profile of high myristate strain.










Fatty Acid
%














C10:0
0.04



C12:0
1.19



C14:0
65.7



C16:0
13.55



C18:0
0.57



C18:1
12.2



C18:2
5.13



C20:0
0.05



C22:0
0.01



C24:0
0.01










Example 53
Production of Eicosenoic and Erucic Fatty Acids  
In this example we demonstrate that expression of heterologous fatty acid elongase (FAE), also known as 3-ketoacyl-CoA synthase (KCS), genes from Cramble abyssinica (CaFAE, Accession No: AY793549), Lunaria annua (LaFAE, ACJ61777), and Cardamine graeca (CgFAE, ACJ61778) leads to production of very long chain monounsaturated fatty acids such as eicosenoic (20:1Δ11) and erucic (22:1Δ13) acids in classically mutagenized derivative of UTEX 1435, Strain Z. On the other hand a putative FAE gene from Tropaeolum majus (TmFAE, ABD77097) and two FAE genes from Brassica napus (BnFAE1, AAA96054 and BnFAE2, AAT65206), while resulting in modest increase in eicosenoic (20:1Δ11), produced no detectable erucic acid in STRAIN Z. Interestingly the unsaturated fatty acid profile obtained with heterologous expression of BnFAE1 in STRAIN Z resulted in noticeable increase in Docosadienoic acid (22:2n6). All the genes were codon optimized to reflect UTEX 1435 codon usage. These results suggest that CaFAE, LaFAE or CgFAE genes encode condensing enzymes involved in the biosynthesis of very long-chain utilizing monounsaturated and saturated acyl substrates, with specific capability for improving the eicosenoic and erucic acid content.
Construct Used for the Expression of the Cramble abyssinica Fatty Acid Elongase (CaFAE) in P. moriformis (UTEX 1435 strain STRAIN Z)-[pSZ3070]: In this example STRAIN Z strains, transformed with the construct pSZ3070, were generated, which express sucrose invertase (allowing for their selection and growth on medium containing sucrose) and C. abyssinica FAE gene. Construct pSZ3070 introduced for expression in STRAIN Z can be written as 6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-CaFAE-Cvnr::6S.
The sequence of the transforming DNA is provided below. Relevant restriction sites in the construct are indicated in lowercase, bold, and are from 5′-3′ BspQI, KpnI, XbaI, MfeI, BamHI, EcoRI, SpeI, AflII, Sad, BspQI, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA from STRAIN Z that permit targeted integration at the 6S locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the Saccharomyces cerevisiae SUC2 gene (encoding sucrose hydrolyzing activity, thereby permitting the strain to grow on sucrose) is indicated by lowercase, boxed text. The initiator ATG and terminator TGA for SUC2 are indicated by uppercase italics, while the coding region is indicated with lowercase italics. The Chlorella vulgaris nitrate reductase (NR) gene 3′ UTR is indicated by lowercase underlined text followed by an endogenous AMTS promoter of P. moriformis, indicated by boxed italicized text. The Initiator ATG and terminator TGA codons of the CaFAE are indicated by uppercase, bold italics, while the remainder of the gene is indicated by bold italics. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the STRAIN Z 6S genomic region indicated by bold, lowercase text. The final construct was sequenced to ensure correct reading frames and targeting sequences.
Nucleotide sequence of transforming DNA contained in plasmid pSZ3070:








(SEQ ID NO: 102)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtcgctgatgt



 


ccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggaggactcctggt


 


ccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaactggtcctccagca


 


gccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtacagaacaaccacgcgccttgtctaggcagaa


 


tccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgccgcttctcccgcacgcttctttcca


 


gcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagtcggggaactctgatcagtctaaacccc


 


cttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccaccccccacaccacctcctcccagaccaattctgt


 
































atgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatgaacgaccccaacggcctgtggtacgacgag


 


aaggacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacgcccttgttctggggccacgccacgtccgacg


 


acctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgccttctccggctccatggtggtggactacaa


 


caacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatctggacctacaacaccccggagtccgaggagcagt


 


acatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaaccccgtgctggccgccaactccacccagttccgcgacccg


 


aaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtcccaggactacaagatcgagatctactcctccgacgacctg


 


aagtcctggaagctggagtccgcgttcgccaacgagggcttcctcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagca


 


ggaccccagcaagtcctactgggtgatgttcatctccatcaaccccggcgccccggccggcggctccttcaaccagtacttcgtcggcagcttc


 


aacggcacccacttcgaggccttcgacaaccagtcccgcgtggtggacttcggcaaggactactacgccctgcagaccttcttcaacaccgac


 


ccgacctacgggagcgccctgggcatcgcgtgggcctccaactgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtcc


 


ctcgtgcgcaagttctccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctgaacatca


 


gcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgtcgacctgtccaacagcaccggca


 


ccctggagttcgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgttcgcggacctctccctctggttcaagggcctgga


 


ggaccccgaggagtacctccgcatgggcttcgaggtgtccgcgtcctccttcttcctggaccgcgggaacagcaaggtgaagttcgtgaagga


 


gaacccctacttcaccaaccgcatgagcgtgaacaaccagcccttcaagagcgagaacgacctgtcctactacaaggtgtacggcttgctgg


 


accagaacatcctggagctgtacttcaacgacggcgacgtcgtgtccaccaacacctacttcatgaccaccgggaacgccctgggctccgtg


 








gtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacacttgctgccttacctgtgaatatccctgccgcttttatcaaacagcctc


 


agtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgctt


 


gcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcc


 


tgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatcccgcgtctc


 


gaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcgcttggtt


 


cttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatggtcgaaacgttcac


 










































































ggacgctggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttg


 


tgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgca


 


acttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtac


 


tgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaaagcttaattaagagctcttattttccaga


 


aggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaatttaaaagcttggaatg


 


ttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccgctcaaaccgcgtacc


 


tctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaattgcctcagaatgtggaatcatc


 


tgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacagcagaccattatgctacctcacaatagttca


 


taacagtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtggccaccccccggccctggtgcttgcggagggcaggt


 


caaccggcatggggctaccgaaatccccgaccggatcccaccacccccgcgatgggaagaatctctccccgggatgtgggcccaccacc


 


agcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatatccttggcatcggccctgaattccttctgccgctctgctacccg


 


gtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgcaaacccttgtcgcgtggcggggcttgttcgagcttgaagagc






Constructs Used for the Expression of the FAE Genes from Higher Plants in STRAIN Z: In addition to the CaFAE gene (pSZ3070), LaFAE (pSZ3071) from Lunaria annua, CgFAE (pSZ3072) from Cardamine graeca, TmFAE (pSZ3067) Tropaeolum majus and BnFAE1 (pSZ3068) and BnFAE2 (pSZ3069) genes from Brassica napus have been constructed for expression in STRAIN Z. These constructs can be described as:

    pSZ3071-6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-LaFAE-Cvnr::6S
    pSZ3072-6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-CgFAE-Cvnr::6S
    pSZ3067-6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-TmFAE-Cvnr::6S
    pSZ3068-6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-BnFAE1-Cvnr::6S
    pSZ3069-6S::CrTUB2-ScSUC2-Cvnr:PmAmt03-BnFAE2-Cvnr::6S


All these constructs have the same vector backbone; selectable marker, promoters, and 3′ utr as pSZ3070, differing only in the respective FAE genes. Relevant restriction sites in these constructs are also the same as in pSZ3070. The sequences of LaFAE, CgFAE, TmFAE, BnFAE1 and BnFAE2 are shown below. Relevant restriction sites as bold text including SpeI and AflII are shown 5′-3′ respectively.
Nucleotide sequence of LaFAE contained in pSZ3071:








(SEQ ID NO: 103)


























Nucleotide sequence of CgFAE contained in pSZ3072:








(SEQ ID NO: 104)




















Nucleotide sequence of TmFAE contained in pSZ3067:








(SEQ ID NO: 105)




















Nucleotide sequence of BnFAE1 contained in pSZ3068:








(SEQ ID NO: 106)




















Nucleotide sequence of BnFAE2 contained in pSZ3069:








(SEQ ID NO: 107)




















To determine their impact on fatty acid profiles, the above constructs containing various heterologous FAE genes, driven by the PmAMT3 promoter, were transformed independently into STRAIN Z.
Primary transformants were clonally purified and grown under standard low-nitrogen lipid production conditions at pH7.0 (all the plasmids require growth at pH 7.0 to allow for maximal FAE gene expression when driven by the pH regulated PmAMT03 promoter). The resulting profiles from a set of representative clones arising from transformations with pSZ3070, pSZ3071, pSZ3072, pSZ3067, pSZ3068 and pSZ3069 into STRAIN Z are shown in Tables 52-57, respectively, below.
All the transgenic STRAIN Z strains expressing heterologous FAE genes show an increased accumulation of C20:1 and C22:1 fatty acid (see Tables 52-57). The increase in eicosenoic (20:1Δ11) and erucic (22:1Δ13) acids levels over the wildtype is consistently higher than the wildtype levels. Additionally, the unsaturated fatty acid profile obtained with heterologous expression of BnFAE1 in STRAIN Z resulted in noticeable increase in Docosadienoic acid (C22:2n6). Protein alignment of aforementioned FAE expressed in STRAIN Z is shown in FIG. 23.







TABLE 52







Unsaturated fatty acid profile in STRAIN Z and representative derivative


transgenic lines transformed with pSZ3070 (CaFAE) DNA.














Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:1
C22:2n6
C22:5





STRAIN Z; T588;
51.49 
9.13
0.65
4.35
1.24
0.11
0.00


D1828-20









STRAIN Z; T588;
55.59 
7.65
0.50
3.78
0.85
0.00
0.13


D1828-23









STRAIN Z; T588;
54.70
7.64
0.50
3.44
0.85
0.09
0.00


D1828-43









STRAIN Z; T588;
52.43
7.89
0.59
2.72
0.73
0.00
0.00


D1828-12









STRAIN Z; T588;
56.02
7.12
0.52
3.04
0.63
0.10
0.11


D1828-19









Cntrl STRAIN Z
57.99 
6.62
0.56
0.19
0.00
0.06
0.05


pH 7









Cntrl STRAIN Z
57.70 
7.08
0.54
0.11
0.00
0.05
0.05


pH 5























TABLE 53







Unsaturated fatty acid profile in STRAIN Z and representative derivative


transgenic lines transformed with pSZ3071 (LaFAE) DNA.














Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:1
C22:2n6
C22:5





STRAIN Z; T588; 
54.66
7.04
0.52
1.82
0.84
0.12
0.09


D1829-36









STRAIN Z; T588; 
56.27
6.72
0.51
1.70
0.72
0.09
0.00


D1829-24









STRAIN Z; T588; 
56.65
8.36
0.54
2.04
0.67
0.00
0.00


D1829-11









STRAIN Z; T588;
55.57
7.71
0.53
0.10
0.66
0.00
0.00


D1829-35









STRAIN Z; T588;
56.03
7.06
0.54 
1.54
0.51
0.06
0.08


D1829-42









Cntrl STRAIN Z
57.70
7.08
0.54
0.11
0.00
0.06
0.05


pH 7









Cntrl STRAIN Z
57.99
6.62
0.56
0.19
0.00
0.05
0.05


pH 5























TABLE 54







Unsaturated fatty acid profile in STRAIN Z and representative derivative


transgenic lines transformed with pSZ3072 (CgFAE) DNA.














Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:1
C22:2n6
C22:5





STRAIN Z; T588; 
57.74
7.79
0.52
1.61
0.25
0.11 
0.05


D1830-47









STRAIN Z; T588;
58.06
7.39
0.55
1.64
0.22
0.07
0.06


D1830-16









STRAIN Z; T588;
57.77
6.86
0.51
1.34
0.19
0.09
0.00


D1830-12









STRAIN Z; T588; 
58.45
7.54
0.49
1.65
0.19
0.06
0.00


D1830-37









STRAIN Z; T588; 
57.10
7.28
0.56
1.43
0.19
0.07
0.00


D1830-44









Cntrl STRAIN Z
57.70
7.08
0.54
0.11
0.00
0.06
0.05


pH 7









Cntrl STRAIN Z
57.99
6.62
0.56
0.19
0.00
0.05
0.05


pH 5























TABLE 55







Unsaturated fatty acid profile in Strain AR and representative derivative transgenic lines 


transformed with pSZ3070 (TmFAE) DNA. No detectable Erucic (22:1) acid 


peaks were reported for these transgenic lines.













Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:2n6
C22:5





STRAIN Z; T588; D1825-47
59.97
7.44
0.56
0.57
0.00
0.00


STRAIN Z; T588; D1825-35
58.77
7.16
0.51
0.50
0.09
0.11


STRAIN Z; T588; D1825-27
60.40
7.82
0.47
0.44
0.07
0.07


STRAIN Z; T588; D1825-14
58.07
7.32
0.54
0.41
0.05
0.05


STRAIN Z; T588; D1825-40
58.66
7.74
0.46
0.39
0.08
0.00


Cntrl STRAIN Z pH 7
57.99
6.62
0.56
0.19
0.05
0.05


Cntrl STRAIN Z pH 5
57.70
7.08
0.54
0.11
0.06
0.05
















TABLE 56







Unsaturated fatty acid profile in STRAIN Z and representative derivative transgenic lines


transformed with pSZ3068 (BnFAE1) DNA. No detectable Erucic (22:1) acid 


peaks were reported for these transgenic lines.













Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:2n6
C22:5





STRAIN Z; T588; D1826-30
59.82 
7.88
0.55
0.32
0.17
0.10


STRAIN Z; T588; D1826-23
59.32
8.02
0.58
0.27
0.18
0.07


STRAIN Z; T588; D1826-45
59.63
7.49
0.55
0.27
0.19
0.08


STRAIN Z; T588; D1826-24
59.35 
7.78
0.57
0.26
0.23
0.00


STRAIN Z; T588; D1826-34
59.14
7.61
0.57
0.25
0.22
0.05


Cntrl STRAIN Z pH 7
57.81 
7.15
0.59
0.19
0.04
0.06


Cntrl STRAIN Z pH 5
58.23
6.70
0.58
0.18
0.05
0.06
















TABLE 57







Unsaturated fatty acid profile in STRAIN Z and representative derivative transgenic lines 


transformed with pSZ3069 (BnFAE2) DNA. No detectable Erucic (22:1) acid 


peaks were reported for these transgenic lines.













Sample ID
C18:1
C18:2
C18:3a
C20:1
C22:2n6
C22:5





STRAIN Z; T588; D1827-6
60.59
8.20
0.57
0.34
0.00
0.07


STRAIN Z; T588; D1827-42
59.62
6.44
0.52
0.30
0.07
0.00


STRAIN Z; T588; D1827-48
59.71 
7.99
0.59
0.30
0.06
0.00


STRAIN Z; T588; D1827-43
60.66
8.21
0.59
0.29
0.04
0.00


STRAIN Z; T588; D1827-3
60.26 
7.99
0.57
0.28
0.04
0.00


Cntrl STRAIN Z pH 7
57.81
7.15
0.59
0.19
0.04
0.06


Cntrl STRAIN Z pH 5
58.23
6.70
0.58
0.18
0.05
0.06









Example 54
Elevating Total Unsaturated Fatty Acids Level by Expressing Heterologous Desaturase Genes
One of the approaches to generate a “zero SAT FAT” (e.g., total unsaturated fatty acids target at 97% or more/less than or equal to 3% saturated fat) strain is to express desaturase genes in a high oleic strain such as Strain N, which we found to produce about 85% C18:1 with total un-saturates around 93% in multiple fermentation runs. We investigated if the total saturates will be further diminished by expressing desaturase genes in Strain N.
In the examples below, we demonstrated the ability to reduce stearic and palmitic levels in wild type strain UTEX1435 by over expression of heterologous stearoyl-ACP desaturase genes, including desaturases from Olea europaea, Ricinus communis, and Chlorella protothecoides. 
Construct Used for the Expression of the Olea europaea Stearoyl-ACP Desaturase: To introduce the 0. europaea stearoyl-ACP desaturase (Accession No: AAB67840.1) into UTEX1435, Strain A, the Saccharomyces cerevisiae invertase gene was utilized as the selectable marker to confer the ability of growing on sucrose media. The construct that has been expressed in UTEX1435, Strain A can be written as 6SA::CrTUB2:ScSUC2:CvNR::CrTUB2:CpSADtp:OeSAD:CvNR::65B and is termed pSZ1377.
Relevant restriction sites in the construct pSZ1377 are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Asc I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by the second C. reinhardtii β-tubulin promoter driving the expression of the OeSAD, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the OeSAD are indicated by uppercase, bold italics, while the remainder of the stearoyl-ACP desaturase coding region is indicated by bold italics. The Chlorella protothecoides stearoyl-ACP desaturase transit peptide is located between initiator ATG and the Asc I site. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ 1377:








(SEQ ID NO: 108)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtc



 


gctgatgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatga


 


gggaggactcctggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggc


 


cgcctccaactggtcctccagcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtaca


 


gaacaaccacgagccttgtctaggcagaatccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcg


 


accctcgctgccgccgcttctcccgcacgcttctttccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgctt


 


cgccgatctgaggacagtcggggaactctgatcagtctaaacccccttgcgcgttagtgttgccatcctttgcagaccggtgag


 


agccgacttgttgtgcgccaccccccacaccacctcctcccagaccaattctgtcacctttttggcgaaggcatcggcctcggcc


 
































cgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatgaacgaccccaacggcc


 


tgtggtacgacgagaaggacgccaagtggcacctgtacaccagtacaacccgaacgacaccgtctgggggacgcccttgttctg


 


gggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgc


 


cttctccggctccatggtggtggactacaacaacacctccggcacttcaacgacaccatcgacccgcgccagcgctgcgtggcca


 


tctggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccacaccgagtaccaga


 


agaaccccgtgctggccgccaactccacccagaccgcgacccgaaggtcactggtacgagccctcccagaagtggatcatgac


 


cgcggccaagtcccaggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaa


 


cgagggcacctcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggt


 


gatgttcatctccatcaaccccggcgccccggccggcggctccacaaccagtacttcgtcggcagcttcaacggcacccacttcg


 


aggccttcgacaaccagtcccgcgtggtggacttcggcaaggactactacgccctgcagaccacttcaacaccgacccgaccta


 


cgggagcgccctgggcatcgcgtgggcctccaactgggagtactccgccacgtgcccaccaacccctggcgctcctccatgtccc


 


tcgtgcgcaagactccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctg


 


aacatcagcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgtcgacctgtc


 


caacagcaccggcaccctggagacgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgacgcggacctc


 


tccctctggacaagggcctggaggaccccgaggagtacctccgcatgggcttcgaggtgtccgcgtcctccacttcctggaccgc


 


gggaacagcaaggtgaagacgtgaaggagaacccctacttcaccaaccgcatgagcgtgaacaaccagcccacaagagcg


 


agaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacgacggcgacgtcgtgtcc


 


accaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgactacatcgac


 








ggactgagccgccacacttgctgccttgacctgtgaatatccctgccgcattatcaaacagcctcagtgtgtttgatcttgtgtgtacgcg


 


cttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaac


 


ttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccaggtagggctccgcctgtattctcc


 


tggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatcccgcgtctcg


 


aacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcg


 


cttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatg


 
































cggatagtatcgacacactctggacgctggtcgtgtgatggactgagccgccacacttgctgccttgacctgtgaatatccctgccgctt


 


ttatcaaacagcctcagtgtgatgatcagtgtgtacgcgcattgcgagagctagctgatgtgctatttgcgaataccacccccagcatc


 


cccttccctcgtttcatatcgcttgcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgc


 


ccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagta


 


gtgggatgggaacacaaatggaaagcttaattaagagctcttgttttccagaaggagttgctccttgagcctttcattctcagcctcg


 


ataacctccaaagccgctctaattgtggagggggttcgaatttaaaagcttggaatgttggttcgtgcgtctggaacaagccca


 


gacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccgctcaaaccgcgtacctctgctttcgcgcaatctgc


 


cctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaattgcctcagaatgtggaatcatctgcaacctgtgc


 


gagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacagcagaccattatgctacctcacaatagttcataac


 


agtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtggccaccaaccggccctggtgcttgcggagggca


 


ggtcaaccggcatggggctaccgaaatccccgaccggatcccaccaccaacgcgatgggaagaatctctccccgggatgtgg


 


gcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatatccttggcatcggccctgaattcct


 


tctgccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgcaaacccttgtcgcgtggcg


 


gggcttgttcgagcttgaagagc 






Construct Used for the Expression of the Ricinus communis Stearovl-ACP Desaturase: To introduce the Ricinus communis stearoyl-ACP desaturase (Accession No: AAA74692.1) into UTEX1435, Strain A, the Saccharomyces cerevisiae invertase gene was utilized as the selectable marker to confer the ability of growing on sucrose media. The construct that has been expressed in UTEX1435, Strain A can be written as 6SA::CrTUB2:ScSUC2:CvNR::PmAMT03:CpSADtp:RcSAD:CvNR::6SB and is termed pSZ1454.
Relevant restriction sites in the construct pSZ1454 are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Asc I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA that permit targeted integration at 6s nuclear chromosomal locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by the endogenous AMT03 promoter driving the expression of the RcSAD, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the RcSAD are indicated by uppercase, bold italics, while the remainder of the stearoyl-ACP desaturase coding region is indicated by bold italics. The Chlorella protothecoides stearoyl-ACP desaturase transit peptide is located between initiator ATG and the Asc I site. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ1454:








(SEQ ID NO: 109)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtcgct



 


gatgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatgagggag


 


gactcctggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggccgcctccaa


 


ctggtcctccagcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtacagaacaaccacg


 


agccttgtctaggcagaatccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcgaccctcgctgccgcc


 


gcttctcccgcacgcttctttccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgcttcgccgatctgaggacagt


 


cggggaactctgatcagtctaaacccccttgcgcgttagtgttgccatcctttgcagaccggtgagagccgacttgttgtgcgccac


 


cccccacaccacctcctcccagaccaattctgtcacctttttggcgaaggcatcggcctcggcctgcagagaggacagcagtgccc


 
































gacgtccgaccgccccctggtgcacttcacccccaacaagggctggatgaacgaccccaacggcctgtggtacgacgagaag


 


gacgccaagtggcacctgtacttccagtacaacccgaacgacaccgtctgggggacgcccttgttctggggccacgccacgtc


 


cgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgccttctccggctccatgg


 


tggtggactacaacaacacctccggcttcttcaacgacaccatcgacccgcgccagcgctgcgtggccatctggacctacaaca


 


ccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccttcaccgagtaccagaagaaccccgtgctg


 


gccgccaactccacccagttccgcgacccgaaggtcttctggtacgagccctcccagaagtggatcatgaccgcggccaagtc


 


ccaggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgttcgccaacgagggcttcc


 


tcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggtgatgttcatct


 


ccatcaaccccggcgccccggccggcggctccttcaaccagtacttcgtcggcagcttcaacggcacccacttcgaggccttcga


 


caaccagtcccgcgtggtggacttcggcaaggactactacgccctgcagaccttcttcaacaccgacccgacctacgggagcg


 


ccctgggcatcgcgtgggcctccaactgggagtactccgccttcgtgcccaccaacccctggcgctcctccatgtccctcgtgcgc


 


aagttctccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctgaacatca


 


gcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgtcgacctgtccaacag


 


caccggcaccctggagttcgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgttcgcggacctctccctc


 


tggttcaagggcctggaggaccccgaggagtacctccgcatgggcttcgaggtgtccgcgtcctccttcttcctggaccgcggg


 


aacagcaaggtgaagttcgtgaaggagaacccctacttcaccaaccgcatgagcgtgaacaaccagcccttcaagagcgag


 


aacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacgacggcgacgtcgtgtcc


 


accaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgttctacatcga


 








tggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtac


 


gcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaacc


 


gcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgt


 


attctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatccc


 


gcgtctcgaacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctga


 


cgaatgcgcttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggt


 






















































































cgatagatctcttaaggcagcagcagctcggatagtatcgacacactctggacgctggtcgtgtgatggactgttgccgccacactt


 


gctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcgcttttgcgagttgctagc


 


tgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatctcgcttgcatcccaaccgcaacttatctacgctgtcct


 


gctatccctcagcgctgctcctgctcctgctgactgcccctcgcacagccttggtttgggctccgcctgtattctcctggtactgcaacct


 


gtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaaagcttaattaagagctcttgttttcca


 


gaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctctaattgtggagggggttcgaatttaaaagc


 


ttggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaaaaggaccatcagctccaaaaaacttgccgct


 


caaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccacattcatattgtgacgcttgagcagtctgtaattgc


 


ctcagaatgtggaatcatctgccccctgtgcgagcccatgccaggcatgtcgcgggcgaggacacccgccactcgtacagcagac


 


cattatgctacctcacaatagttcataacagtgaccatatttctcgaagctccccaacgagcacctccatgctctgagtggccaccc


 


cccggccctggtgcttgcggagggcaggtcaaccggcatggggctaccgaaatccccgaccggatcccaccacccccgcgatggg


 


aagaatctctccccgggatgtgggcccaccaccagcacaacctgctggcccaggcgagcgtcaaaccataccacacaaatatcct


 


tggcatcggccctgaattccttctgccgctctgctacccggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgca


 


aacccttgtcgcgtggcggggcttgttcgagcttgaagagc






Construct Used for the Expression of the Chlorella protothecoides Stearoyl-ACP Desaturase: To introduce the Chlorella protothecoides stearoyl-ACP desaturase into UTEX1435, Strain Z, the Saccharomyces cerevisiae invertase gene was utilized as the selectable marker to confer the ability of growing on sucrose media. The construct that has been expressed in UTEX1435, Strain Z can be written as 6SA::CrTUB2:ScSUC2:CvNR::PmAMT03:CpSAD1:CvNR::6SB and is termed pSZ3144.
Relevant restriction sites in the construct pSZ3144 are indicated in lowercase, bold and underlining and are 5′-3′ BspQ 1, Kpn I, Xba I, Mfe I, BamH I, EcoR I, Spe I, Cla I, Sac I, BspQ I, respectively. BspQI sites delimit the 5′ and 3′ ends of the transforming DNA. Bold, lowercase sequences represent genomic DNA that permit targeted integration at 6s locus via homologous recombination. Proceeding in the 5′ to 3′ direction, the C. reinhardtii β-tubulin promoter driving the expression of the yeast sucrose invertase gene is indicated by boxed text. The initiator ATG and terminator TGA for invertase are indicated by uppercase, bold italics while the coding region is indicated in lowercase italics. The Chlorella vulgaris nitrate reductase 3′ UTR is indicated by lowercase underlined text followed by the endogenous AMT03 promoter driving the expression of the CpSAD1, indicated by boxed italics text. The Initiator ATG and terminator TGA codons of the CpSAD1 are indicated by uppercase, bold italics, while the remainder of the stearoyl-ACP desaturase coding region is indicated by bold italics. The C. vulgaris nitrate reductase 3′ UTR is again indicated by lowercase underlined text followed by the 6S genomic region indicated by bold, lowercase text.
Nucleotide sequence of transforming DNA contained in pSZ3144:








(SEQ ID NO: 110)



gctcttcgccgccgccactcctgctcgagcgcgcccgcgcgtgcgccgccagcgccttggccttttcgccgcgctcgtgcgcgtc



 


gctgatgtccatcaccaggtccatgaggtctgccttgcgccggctgagccactgcttcgtccgggcggccaagaggagcatga


 


gggaggactcctggtccagggtcctgacgtggtcgcggctctgggagcgggccagcatcatctggctctgccgcaccgaggc


 


cgcctccaactggtcctccagcagccgcagtcgccgccgaccctggcagaggaagacaggtgaggggggtatgaattgtaca


 


gaacaaccacgagccttgtctaggcagaatccctaccagtcatggctttacctggatgacggcctgcgaacagctgtccagcg


 


accctcgctgccgccgcttctcccgcacgcttctttccagcaccgtgatggcgcgagccagcgccgcacgctggcgctgcgctt


 


cgccgatctgaggacagtcggggaactctgatcagtctaaacccccttgcgcgttagtgttgccatcctttgcagaccggtgag


 


agccgacttgttgtgcgccaccccccacaccacctcctcccagaccaattctgtcacctttttggcgaaggcatcggcctcggcc


 
































cgcctccatgacgaacgagacgtccgaccgccccctggtgcacttcacccccaacaagggctggatgaacgaccccaacggcc


 


tgtggtacgacgagaaggacgccaagtggcacctgtacaccagtacaacccgaacgacaccgtctgggggacgcccagactg


 


gggccacgccacgtccgacgacctgaccaactgggaggaccagcccatcgccatcgccccgaagcgcaacgactccggcgc


 


cttctccggctccatggtggtggactacaacaacacctccggcacttcaacgacaccatcgacccgcgccagcgctgcgtggcca


 


tctggacctacaacaccccggagtccgaggagcagtacatctcctacagcctggacggcggctacaccacaccgagtaccaga


 


agaaccccgtgctggccgccaactccacccagaccgcgacccgaaggtcactggtacgagccctcccagaagtggatcatgac


 


cgcggccaagtcccaggactacaagatcgagatctactcctccgacgacctgaagtcctggaagctggagtccgcgacgccaa


 


cgagggcacctcggctaccagtacgagtgccccggcctgatcgaggtccccaccgagcaggaccccagcaagtcctactgggt


 


gatgttcatctccatcaaccccggcgccccggccggcggctccacaaccagtacttcgtcggcagcttcaacggcacccacttcg


 


aggccttcgacaaccagtcccgcgtggtggacttcggcaaggactactacgccctgcagaccacttcaacaccgacccgaccta


 


cgggagcgccctgggcatcgcgtgggcctccaactgggagtactccgccacgtgcccaccaacccctggcgctcctccatgtccc


 


tcgtgcgcaagactccctcaacaccgagtaccaggccaacccggagacggagctgatcaacctgaaggccgagccgatcctg


 


aacatcagcaacgccggcccctggagccggttcgccaccaacaccacgttgacgaaggccaacagctacaacgtcgacctgtc


 


caacagcaccggcaccctggagacgagctggtgtacgccgtcaacaccacccagacgatctccaagtccgtgacgcggacctc


 


tccctctggacaagggcctggaggaccccgaggagtacctccgcatgggcttcgaggtgtccgcgtcctccacttcctggaccgc


 


gggaacagcaaggtgaagacgtgaaggagaacccctacttcaccaaccgcatgagcgtgaacaaccagcccacaagagcg


 


agaacgacctgtcctactacaaggtgtacggcttgctggaccagaacatcctggagctgtacttcaacgacggcgacgtcgtgtcc


 


accaacacctacttcatgaccaccgggaacgccctgggctccgtgaacatgacgacgggggtggacaacctgactacatcgac


 








ggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtttgatcttgtgtgtacgcg


 


cttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgcttgcatcccaaccgcaac


 


ttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgggctccgcctgtattctcc


 


tggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatggaggatcccgcgtctcg


 


aacagagcgcgcagaggaacgctgaaggtctcgcctctgtcgcacctcagcgcggcatacaccacaataaccacctgacgaatgcg


 


cttggttcttcgtccattagcgaagcgtccggttcacacacgtgccacgttggcgaggtggcaggtgacaatgatcggtggagctgatg


 
















































































gacgctggtcgtgtgatggactgttgccgccacacttgctgccttgacctgtgaatatccctgccgcttttatcaaacagcctcagtgtgtt


 


tgatcttgtgtgtacgcgcttttgcgagttgctagctgcttgtgctatttgcgaataccacccccagcatccccttccctcgtttcatatcgctt


 


gcatcccaaccgcaacttatctacgctgtcctgctatccctcagcgctgctcctgctcctgctcactgcccctcgcacagccttggtttgg


 


gctccgcctgtattctcctggtactgcaacctgtaaaccagcactgcaatgctgatgcacgggaagtagtgggatgggaacacaaatg


 


gaaagcttaattaagagctcttgttttccagaaggagttgctccttgagcctttcattctcagcctcgataacctccaaagccgctct


 


aattgtggagggggttcgaatttaaaagcttggaatgttggttcgtgcgtctggaacaagcccagacttgttgctcactgggaa


 


aaggaccatcagctccaaaaaacttgccgctcaaaccgcgtacctctgctttcgcgcaatctgccctgttgaaatcgccaccac


 


attcatattgtgacgcttgagcagtctgtaattgcctcagaatgtggaatcatctgcaacctgtgcgagcccatgccaggcatgt


 


cgcgggcgaggacacccgccactcgtacagcagaccattatgctacctcacaatagttcataacagtgaccatatttctcgaa


 


gctccccaacgagcacctccatgctctgagtggccaccccccggccctggtgcttgcggagggcaggtcaaccggcatgggg


 


ctaccgaaatccccgaccggatcccaccaccaacgcgatgggaagaatctctccccgggatgtgggcccaccaccagcacaa


 


cctgctggcccaggcgagcgtcaaaccataccacacaaatatccttggcatcggccctgaattccttctgccgctctgctaccc


 


ggtgcttctgtccgaagcaggggttgctagggatcgctccgagtccgcaaacccttgtcgcgtggcggggcttgttcgagcttg


 


aagagc






Primary transformants were clonally purified and grown under low-nitrogen lipid production conditions at either pH5.0 or pH7.0, depending on the promoters that drive the expression of the desaturase genes. Transgenic lines arising from the transformations with pSZ1377 (D583) were assayed in (low-nitrogen) lipid production media at pH5.0, because of the nature of the promoters and the fact that P. moriformis produces more lipid at pH5.0. Transgenic lines generated from the transformation of pSZ1454 (D648) and pSZ3144 (D1923) are assayed at pH 7.0 to allow for maximal desaturase gene expression when driven by the pH regulated PmAMT3 promoter. The resulting profiles from representative clones arising from transformations with D583, D648, and D1923 are shown in Tables 58, 59, and 60, respectively, below. The result of expression of OeSAD and CpSAD1 genes is a clear diminution of C18:0 chain lengths with an increase in C18:1. Also we noticed that there is a subtle increase in the level of C16:1, indicating these stearoyl-ACP desaturases may have broad specificity. The transformants resulted from the expression of RcSAD gene also diminishes in the level of C18:0, and elevation in C16:1. Notably, C16:1 could be increased from under 1% to over 1.5% or over 2%. However, there is also a drop in the level of C18:1 fatty acid and increase in C18:2, which may be caused by the growth defect of these transgenic lines.







TABLE 58







Lipid profile of representative clones arising from transformation with


D583 (pSZ1377) DNA












Sample







ID
C16:0
C16:1
C18:0
C18:1
C18:2















D583-25
19.20
1.53
1.15
64.08
11.76


D583-10
21.86
0.99
1.77
61.43
11.42


D583-3
21.94
0.95
1.85
62.22
10.53


D583-33
20.76
0.95
1.85
61.76
12.17


D583-26
20.18
0.92
1.89
62.56
11.97


D583-1
21.28
0.95
1.90
62.63
10.94


S1331
25.48
0.71
3.23
59.70
8.25
















TABLE 59







Lipid profile of representative clones arising from transformation with


D648 (pSZ1454) DNA












Sample ID
C16:0
C16:1
C18:0
C18:1
C18:2















D648-9
26.92
2.30
1.12
54.27
11.30


D648-28
26.54
2.50
1.32
52.58
12.90


D648-15
29.47
1.68
1.48
51.74
11.48


D648-12
27.39
1.41
1.66
54.45
11.58


D648-43
29.74
1.52
1.68
52.59
10.85


D648-7
26.98
1.62
1.69
54.51
11.39


S1331-pH7
25.86
0.96
2.84
58.33
9.16
















TABLE 60







Lipid profile of representative clones arising from transformation with D1923 (pSZ3144) DNA














Sample ID
C14:0
C14:1
C16:0
C16:1
C18:0
C18:1
C18:2





Block 2; E2; pH7; STRAIN Z; T613;
1.46
0.11
20.74
2.54
0.86
63.99
9.03


D1923-2









Block 2; G12; pH7; STRAIN Z; T613;
1.52
0.10
25.20
1.97
1.67
61.10
7.38


D1923-36









Block 2; E8; pH7; STRAIN Z; T613;
1.48
0.09
26.41
1.78
1.54
60.54
7.01


D1923-8









Block 2; F3; pH7STRAIN Z; T613; 
1.50
0.07
25.87
1.75
1.62
61.25
6.94


D1923-15









Block 2; F9; pH7; STRAIN Z; T613;
1.47
0.07
27.02
1.73
1.84
60.15
6.55


D1923-21









Block 2; F4; pH7; STRAIN Z; T613;
1.44
0.07
24.30
1.71
1.41
62.79
7.29


D1923-16









pH7 STRAIN Z
1.47
0.00
28.25
0.82
3.16
58.27
6.72









Example 55
Microemulsion Preparation and Cleaning Efficiency
Microemulsions were prepared using the fatty acid methyl ester of the high oleic (HO) oil of Example 49 (“FAME-HO oil” below), d-Limonene, and various other methyl esters, and the performance/ability of the microemulsions to remove bitumen soil from a hard surface were compared. Eight microemulsions were tested, with varying percentages of components, as shown in Table 61, below.







TABLE 61







Microemulsion compositions.
















1
2
3
4
5
6
7
8


















d-Limonene
20.0
x
x
x
x
x
x
10.0


FAME-HO oil
x
20.0
10.0
15.0
x
x
10.0
10.0


Methyl Soyate
x
x
x
x
20.0
x
10.0
x


Methyl Canolate
x
x
x
x
x
20.0
x
x


Methyl
x
x
x
5.0
x
x
x
x


Ricinoleate










Videt ME-80
13.5
20.72
15.9
19.24
20.72
20.72
20.72
19.24


Neodol N91-8
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0


di Water
63.5
56.28
71.1
57.76
56.28 
56.28
56.28
57.76









Each of the compositions in Table 61 was tested for cleaning efficacy. Reflectance values of white vinyl tile were taken (via 5 readings per tile in the 3×2 inch test area) before soiling, and an average reflectance calculated. A bitumen/solvent soil mixture was applied to the white vinyl tile and rubbed to an even consistency. The soil was then dried for 17.5 hours in a 40° C. forced air oven. Once cooled to ambient temperature, the reflectance values were again measured and the soiled panel was placed on a Gardner straight-line washability apparatus. A 10 ml sample of test product (microemulsion compositions) was applied to a cellulose sponge and inverted directly onto the soiled test area. The panel was scrubbed for 3 cycles and then rinsed with cool tap water and air dried. Reflectance after cleaning was determined and used to calculate percent soil removed. The cleaning efficiency results are shown in Table 62, below. % cleaning efficiency=(Rc−Rs)/(Ro−Rs)×100, where Rc is the cleaned reflectance, Ro is the original reflectance, and Rs is the soiled reflectance.







TABLE 62







Cleaning efficiency results of microemulsion compositions.










Microemulsion Composition




(from Table 61)
Average % Cleaning Efficiency







1
73.8



2
77.7



3
11.2



4
51.0



5
75.1



6
76.3



7
76.7



8
78.4










Example 56
Epoxidized Oil from Strain R
To a 2 L 3-neck round bottom flask equipped with a mechanical stirrer, addition funnel, heating mantle, thermocouple and Argon gas inlet was charged 787.95 g of oil from Strain R (Example 49) and 32 mL of formic acid. The reaction mixture was heated to 50° C. and 179 mL of 50% hydrogen peroxide solution was added dropwise over 12 minutes while maintaining the temperature below 65° C. An ice water bath was used in place of the heating mantle to maintain the temperature between 50° C. and 65° C. After observing an exotherm, the reaction was then maintained at 55° C. with periodic sampling and determination by proton NMR that the reaction was >95% complete. The reaction mixture was transferred to a 6 L separatory funnel with 2 L of ethyl acetate, water layer removed, treated with 6×150 mL of saturated sodium bicarbonate at which point the pH of the water layer was 8-9 and followed with a brine rinse. The epoxidized oil was dried over magnesium sulfate and filtered warm due to low melting solid product. The solvent was removed at 60° C. under reduced pressure to yield 814 g (98.5% yield) of epoxidized oil.
Example 57
Epoxide Ring Opening
To a 3 L 3-neck round bottom flask equipped with a mechanical stirrer, thermocouple, addition funnel, heating mantle and Argon gas inlet was charged 500 mL of methanol and 21.20 g of 48% fluoroboric acid. The mixture was stirred and heated to 40° C. Over a 1.5 hour time period, a mixture of 915.60 g of epoxidized algal oil from Example 56 and 400 mL of chloroform was added dropwise to the reaction flask. An additional 120 mL of chloroform was used to rinse the remaining oil into the reaction flask. After 1 hour, the reaction mixture was sampled and oxirane conversion determined to be complete by proton NMR. To the reaction flask, 11 g of sodium bicarbonate was added with stirring to neutralize the acid. A majority of the solvent was removed under reduced pressure at 40° C. The polyol was then dissolved in 1 L of ethyl acetate and extracted with 3×100 mL of a 20% potassium carbonate solution. The organic layer was then dried over magnesium sulfate, filtered and solvent removed at 80° C. under reduced pressure to yield 951.71 g (95.7% yield) of the methyl ether alcohol. The hydroxyl value was determined by NMR to be 146 mg KOH/g. The product was then combined with a similarly prepared batch (1955 g, 93.9% yield, HVNMR=145) to constitute the final methyl ether alcohol (HVNMR=145 and HVTitration=145). Alternatively, the fluoroboric acid can be replaced with copper tetrafluoroborate. This replacement was found to result in a number of advantages including allowing for the addition of a full charge of reagents instead of dropwise addition, less diglyceride formation, eliminating need for acid neutralization and resulting salt removal, extraction of catalyst with water/brine wash, and diminished reaction exotherm allowing for less solvent use. The ethyl acetate in the workup can also be replaced with methyl acetate. This replacement was found to result in less emulsification and easier separation. Additionally removal of the solvent was not necessary and can be carried on to the urethane condensation reaction.
Example 58
Epoxidized Oil from High Oleic Strain
A classically mutagenized P. moriformis line was transformed with a construct targeting an endogenous FATA1 site for disruption with overexpression of an endogenous KASII gene using the methods described above. The resulting strain produced an oil with a high oleic acid profile as shown in Table 63 below.







TABLE 63







Fatty acid profile of oil.










Fatty acid profile
Percent














C10:0
0.01



C12:0
0.03



C14:0
0.45



C15:0
0.02



C16:0
3.34



C16:1 cis-Δ7
0.05



C16:1 cis-Δ9
0.11



C17:0
0.04



C17:1 cis-Δ9
0.03



C18:0
2.82



C18:1
81.72



C18:2 cis, cis-Δ9, Δ12
8.3



C18:2 trans, trans-Δ9, Δ12
0.04



C18:3 alpha
0.48



C20:0
0.33



C20:1
0.87



C22:0
0.08



C23:0
0.02



C24:0
0.17










To a 5 L 3-neck round bottom flask equipped with a mechanical stirrer, addition funnel, heating mantle was charged 2595 g of oil from the high oleic strain and 123 mL of formic acid, thermocouple and Argon gas inlet. The reaction mixture was heated to 50° C. and 681 mL of 50% hydrogen peroxide solution was added dropwise over 1 hour while maintaining the temperature below 55° C. An ice water bath was used in place of the heating mantle to maintain the temperature between 50° C. and 65° C. After observing an exotherm, the reaction was then maintained at 55° C. with periodic sampling and determination by proton NMR that the reaction was >95% complete. The reaction mixture was transferred to a 6 L separatory funnel with 2 L of ethyl acetate, water layer removed and then treated with 6×150 mL of saturated sodium bicarbonate at which point the pH of the water layer was 8-9. The epoxidized oil solution was dried over magnesium sulfate and filtered warm due to low melting solid product. The product was combined with another similarly prepared batch and solvent was removed at 60° C. under reduced pressure to yield 5295 g (98.2% yield) of epoxidized algal oil.
Example 59
Epoxide Ring Opening
To a 5 L 3-neck round bottom flask equipped with a mechanical stirrer, thermocouple, addition funnel, heating mantle and Argon gas inlet was charged 1053 mL of methanol and 45.79 g of 48% fluoroboric acid. The mixture was stirred and heated to 40° C. Over a 2 hour time period, a mixture of 2000 g of epoxidized algal oil from Example 58 and 1350 mL of chloroform was added dropwise to the reaction flask. After 2.75 hours, the heating was stopped and the reaction mixture was sampled and oxirane conversion determined to be complete by proton NMR. To the reaction flask, 25 g of sodium bicarbonate was added with stirring to neutralize the acid. A majority of the solvent was removed under reduced pressure at 40° C. The alcohol was dissolved in 2 L of ethyl acetate, extracted with 5×200 mL of a 20% potassium carbonate solution and followed by a brine wash. The organic layer was then dried over magnesium sulfate, filtered and solvent removed at 60° C. under reduced pressure to yield 2159.37 g (89.4% yield) of alcohol. The hydroxyl value was determined by NMR to be 179 mg KOH/g. The product was combined with a similarly prepared batch (2130.9 g, 88.2% yield, HVNMR=179) to constitute the final batch (HVNMR=179 and HVTitration=184).
Example 60
Epoxidized Soybean Oil
To a 5 L 3-neck round bottom flask equipped with a mechanical stirrer, addition funnel, heating mantle, thermocouple and Argon gas inlet was charged 2273 g of soybean oil (Sigma Aldrich Cat# W530261-5KG-K, Lot# MKAA3696V) and 150 mL of formic acid. The reaction mixture was heated to 50° C. and 845 mL of 50% hydrogen peroxide solution was added dropwise over 1.75 hours while maintaining the temperature at  ̃55° C. An ice water bath was used in place of the heating mantle to maintain the temperature between 50° C. and 65° C. After observing an exotherm, the reaction was then maintained at 55° C. with periodic sampling and determination by proton NMR that the reaction was >95% complete. The reaction mixture was transferred to a 6 L separatory funnel with 2 L of ethyl acetate. The water layer was removed and polyol solution treated with 6×150 mL of saturated sodium bicarbonate at which point the pH of the aqueous layer was 8-9. The epoxidized oil was dried over magnesium sulfate and filtered warm due to low melting solid product. The product solution was combined with another similarly prepared batch, solvent removed at 60° C. under reduced pressure to yield 5231 g (101% yield, residual solvent noted in proton NMR spectrum) of epoxidized soybean oil.
Example 61
Epoxidized Soybean Oil Ring Opening
To a 5 L 3-neck round bottom flask equipped with a mechanical stirrer, thermocouple, addition funnel, heating mantle and Argon gas inlet was charged 1310 mL of methanol and 48.49 g of 48% fluoroboric acid. The mixture was stirred and heated to 40° C. Over a 2 hour time period, a mixture of 1805 g of epoxidized soybean oil from Example 60 and 1250 mL of chloroform was added dropwise to the reaction flask. An additional 310 mL of chloroform was used to rinse the remaining oil into the reaction flask. After 1 hour, the reaction mixture was sampled and the oxirane conversion was determined to be complete by proton NMR. 25 g of sodium bicarbonate was added with stirring to neutralize the acid. A majority of the solvent was removed under reduced pressure at 40° C. The polyol was dissolved in 2 L of ethyl acetate and extracted with 3×200 mL of a 20% potassium carbonate solution. The organic layer was then dried over magnesium sulfate, filtered and solvent removed at 90° C. under reduced pressure to yield 1839 g (89.5% yield) of polyol. The hydroxyl value was determined by NMR to be 191 mg KOH/g. The product was combined with another similarly prepared batch (1909 g, 92.8% yield, HVNMR=191) to constitute the final product (HVNMR=191 and HVTitration=201).
Example 62
Triglyceride/Polyol Analysis
The iodine values the triacylglyceride oils of Examples 56, 58, and 60 and hydroxyl values of their corresponding polyols of Examples 57, 59, and 61 are shown below in Table 64.







TABLE 64







Iodine values of triglyceride oils.










Triacylglyceride
Polyol Hydroxyl



Iodine Value
value (mg KOH/g)











Sample
NMR
Titration
NMR
Titration














Examples 56/57 (HSAO
74.3
74.6
145
145


High Stability Algal Oil


Examples 58/59 (HOAO
87.1
88
179
184


High Oleic Algal Oil)


Example 60/61
122
—
191
201


(Soybean Oil)









The polyol of Example 57 was surprisingly found to be a liquid at room temperature and amenable to being a reactant with an isocyanate. US 2011/006581 describes partially hydrogenated soybean oils. The oils with low iodine values of 60 and 75 (Table 1, PHSBO-60 and PHSBO-75) were not able to be made into a foam because of the large amounts of solids present in the polyol (page 10, column 2 lines 18-20). Without being bound by theory, it is believed that the partial hydrogenation process creates trans-fatty acids and increases C18:0 levels through hydrogenation of the C18:1, C18:2, and C18:3 double bonds, thereby creating triacylglycerides that favor solid formation particularly at elevated hydrogenation levels such as those where the iodine values of the triacylglyceride precursor is 75 or less.
Example 63
General Procedure for Preparation of Polyurethanes
Hand mixing was performed with a Craftsman 2⁄3 hp drill press with a stainless steel stirring shaft and propeller blade operating at 3100 rpm

    
    
        1. Weigh formulation components into plastic cups:
        
            a. “A” Side—isocyanate
            b. “B” Side—alcohol, catalysts, blowing agent, surfactant and other additives (e.g., flame retardant)
        
        
        2. “B” side is blended for 30 seconds
        3. “A” side is added to the “B” cup and blended for a predetermined amount of time (e.g., 10 seconds) and then poured into the receiving container (e.g., plastic bin or paper cake box)
        4. Record reaction profile times in seconds: mix, cream, gel and rise
        
            a. Cream—mixture turns “cloudy”
            b. Gel—“stringing” of the surface after being touched
            c. Rise—foam has reached maximum height
        
        
        5. Immediately place in 80° C. oven for 30 minutes to complete cure
        6. Remove from oven, crush foam by hand, inspect for deformity and condition at standard room conditions for specified period (e.g., 1 week).
        7. Cut foam bun into required specimen shapes with a scalloped blade on a band saw, removing edges and noting the rise direction
    
    


Example 64
Polyurethane Foams
Polyurethane foams were prepared using polyols of Examples 57, 59, and 61 according to the general procedure in Example 62 and the formulations of Tables 65 and 66. The polyether polyol Jeffol G31-28 is a glycerin initiated, E0-tipped polyol, MW 6000.
Foams where 50% of the polyether polyol was replaced with algal derived polyol were found to have increased stability when the amount of diethanolamine catalyst was increased.







TABLE 65







Foam formulations.














Polyol
Eq. weight
Control
1
2
3
4
5

















Jeffol G31-28
1951.54
97
87.3
87.3
87.3
77.6
77.6


Ex. 57 HSAO
386.9
0
9.7
0
0
19.4
0


Ex. 59 HOAO
313.4
0
0
9.7
0
0
19.4


Ex. 61 Soybean
293.7
0
0
0
9.7
0
0


% Replacement

0
10
10
10
20
20


Water
9
3.6
3.6
3.6
3.6
3.6
3.6


Lumulse POE 26
416.2
3
3
3
3
3
3


Tegostab B 4690
1335.7
1
1
1
1
1
1


Dabco 33LV
105
0.8
0.8
0.8
0.8
0.8
0.8


Diethanolamine
35.04
1
1
1
1
1
1


Niax A-1
233.7
0.1
0.1
0.1
0.1
0.1
0.1


Isocyanate
130
57.81
60.15
60.84
61.08
62.51
63.89


Mondur 1488









NCO Index

90
90
90
90
90
90


Total weight

164.31
166.65
167.34
167.58
169.01
170.39
















TABLE 66







Foam formulations.














Polyol
Eq. weight
6
7
8
9
10
11

















Jeffol G31-28
1951.54
77.6
48.5
48.5
48.5
48.5
48.5


Ex. 57 HSAO
386.9
0
48.5
0
0
48.5
0


Ex. 59 HOAO
313.4
0
0
48.5
0
0
0


Ex. 61 Soybean
293.7
19.4
0
0
48.5
0
48.5


% Replacement

20
50
50
50
50
50


Water
9
3.6
3.6
3.6
3.6
3.6
3.6


Lumulse POE 26 
416.2
3
3
3
3
3
3


Tegostab B 4690
1335.7
1
1
1
1
1
1


Dabco 33LV
105
0.8
0.8
0.8
0.8
0.8
0.8


Diethanolamine 
35.04
1
1
1
1
1
1


Niax A-1
233.7
0.1
0.1
0.1
0.1
0.1
0.1


Isocyanate
130
64.37
69.57
73.01
74.22
73.29
77.94


Mondur 1488









NCO Index

90
90
90
90
90
90


Total weight

170.87 
176.07
179.51
180.72
180.79
185.44









The foams for tested for various mechanical properties in Examples 65-71. In the Tables of these Examples, “Replacement” refers to the percent replacement by weight of the soy-based polyether polyol with polyols derived from algal oils.
Example 65
Density
Polyurethane foams of Example 64 were tested to measure density according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). Results are shown in Table 67 and FIG. 25.







TABLE 67







Density of polyurethane foams (lbs/ft3).











Replacement
Control
HSAO
HOAO
Soy














0%
2.42





10%

2.27
2.33
2.29


20%

2.15
2.13
2.17


50%

2.23
2.24









Example 66
Resilience Via Ball Rebound
Polyurethane foams of Example 64 were tested to measure surface resilience according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). In this test a steel ball is dropped on the foam and rebound height is measured as a percentage of the drop height. Results are shown in Table 68 and FIG. 26.







TABLE 68







Percent rebound of polyurethane foams.











Replacement
Control
HSAO
HOAO
Soy














0%
64.17%





10%

48.78%
46.61%
47.83%


20%

36.94%
33.83%
35.22%


50%

22.11%
18.33%









Example 67
Tensile Strength at Break
Polyurethane foams of Example 64 were tested to measure tensile strength according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). The test measures the force required to stretch the foams to breaking point. Results are shown in Table 69 and FIG. 27.







TABLE 69







Tensile strength of polyurethande foams - stress (kPa)











Replacement
Control
HSAO
HOAO
Soy














0%
94.30





10%

106.12
102.15
106.55


20%

101.60
112.24
117.93


50%

136.52
134.89









Example 68
Elongation
Polyurethane foams of Example 64 were tested to measure the percent elongation (percent that a sample will stretch) before breakage according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). Results are shown in Table 70 and FIG. 64.







TABLE 70







Percent elongation of polyurethane foams.











Replacement
Control
HSAO
HOAO
Soy














0%
141%





10%

142%
141%
133%


20%

139%
131%
121%


50%

115%
90%









Example 69
Compression Force Deflection
Polyurethane foams of Example 64 were tested to measure compression force deflection (resistance to compression) according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). Results are shown in Table 71 and FIG. 29.







TABLE 71







Compression force (kPa) deflection of polyurethane foams.











Replacement
Control
HSAO
HOAO
Soy














0%
4.20





10%

4.60
4.38
5.15


20%

4.10
5.22
8.63


50%


21.41









Example 70
Compression Set
Polyurethane foams of Example 64 were tested to measure compression set according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). The compression set is a permanent, unrecovered loss in thickness following compression and is expressed as a percentage of the original, uncompressed thickness. Results are shown in Table 72 and FIG. 30.







TABLE 72







Percent compression set of polyurethane foams.











Replacment
Control
HSAO
HOAO
Soy














0%
10%





10%

10%
13%
12%


20%

14%
29%
36%


50%


47%









The loss in thickness after compression for foam derived from high stability algal polyol was surprisingly found to be 15% better than for foam derived from high oleic algal oil and 22% better than foam derived from soy at the 20% loading level.
Example 71
Hysteresis
Polyurethane foams of Example 64 were tested to measure hysteresis according to standard test methods for Flexible Cellular Material-Slab, Bonded and Molded Urethane Foams (ASTM D3574). Hysteresis provides a measure of the durability of the foam to maintain its load bearing capability, with lower percentage values reflecting lower losses in firmness is preferable. Results are shown in Table 73 and FIG. 31.







TABLE 73







Percent hysteresis of polyurethane foams.












Control
HSAO
HOAO
Soy














0%
35%





10%

48%
51%
54%


20%

58%
66%
70%


50%


95%









The described embodiments of the invention are intended to be merely exemplary and numerous variations and modifications will be apparent to those skilled in the art. All such variations and modifications are intended to be within the scope of the present invention. For example, the various triglyceride oils can be tailored in for a mixture of midchain and long chain fatty acids in order to adjust parameters such as polarity, solvency, and foam-height of the oils or chemicals made from the oils. In addition, where a knockout of a gene is called for, an equivalent result may be reached using knockdown techniques including mutation and expression of inhibitory substances such as RNAi or antisense.

## Claims

1. A method for preparing a polyurethane foam, the method comprising:
a) providing a microalgal oil comprising triacylglycerides having a fatty acid profile of at least 80% 18:1 fatty acids and less than 4% 18:2 fatty acids, the triglycerides further having an iodine value of 75 or less and/or is non-hydrogenated;
b) subjecting the triacylglycerides to an epoxidation reaction to form epoxides;
c) subjecting the epoxides to a ring opening reaction to form microalgal derived polyols, wherein the microalgal derived polyols are liquids at room temperature;
d) blending the microalgal derived polyols with petroleum derived polyols to form blended polyols; and
e) subjecting the blended polyols to an isocyanate condensation reaction to form the polyurethane foam.

2. The method of claim 1 wherein the polyurethane foam has less than 25% loss in thickness after being compressed to 75% thickness at 70° C. and 5% relative humidity for 22 hours in accordance with American Society for Testing and Materials standard ASTM D-3574.

3. The method of claim 1, wherein the polyurethane foam maintains a yellowness index of 31 or less after being exposed to ambient light for 18 weeks in accordance with American Society for Testing and Materials standard ASTM D-E313.

4. The method of claim 1, wherein the triacylglycerides have an iodine value of 70-75.

5. The method of claim 4 wherein the triacylglycerides have an iodine value of 74 to 75.

6. The method of claim 1, wherein the triacylglycerides have a fatty acid profile of less than 1% trans fatty acids or wherein the triacylglyceride is non-hydrogenated.

7. The method of claim 6, wherein the triacylglycerides have a fatty acid profile of less than 0.1% trans fatty acids.

8. The method of claim 1, wherein the triacylglycerides have a fatty acid profile of less than 3% 18:2 fatty acids.

9. The method of claim 8, wherein the triacylglycerides have a fatty acid profile of less than 2% 18:2 fatty acids.

10. The method of claim 8, wherein the triacylglycerides have a fatty acid profile of less than 1% 18:2 fatty acids.

11. The method of claim 8, wherein the triacylglycerides have a fatty acid profile of less than 0.1% 18:2 fatty acids.

12. The method of claim 8, wherein the triacylglycerides have a fatty acid profile of less than 0.01% 18:2 fatty acids.

13. The method of claim 1, wherein the triacylglycerides have a fatty acid profile of at least 85% 18:1 fatty acids and 0.1% or less 18:2 fatty acids.

14. The method of claim 1, wherein the microalgal oil further comprises C29 and C28 sterols, wherein the amount of C28 sterols is greater than C29 sterols.

15. The method of claim 1, wherein the microalgae is Parachlorella, Prototheca, or Chlorella.

16. The method of claim 15, wherein the microalgae is Prototheca or Prototheca moriformis.

17. The method of claim 1, wherein the blended polyols comprise at least 20% by weight of the microalgal derived polyols.

18. The method of claim 1, wherein the polyols are mixed with a catalyst prior to the isocyanate condensation reaction.

19. The method of claim 18 wherein the catalyst is an amine catalyst.

20. The method of claim 19 wherein the amine catalyst is a diethanolamine catalyst.

21. The method of claim 20, wherein the mole ratio of the amine catalyst to the microalgal derived polyol is greater than 3:1.