# Patent

## Title
Encapsulation of plasmid DNA (lipogenesTM) and therapeutic agents with nuclear localization signal/fusogenic peptide conjugates into targeted liposome complexes

## Abstract

A method is disclosed for encapsulating plasmids, oligonucleotides or negatively-charged drugs into liposomes having a different lipid composition between their inner and outer membrane bilayers and able to reach primary tumors and their metastases after intravenous injection to animals and humans. The formulation method includes complex formation between DNA with cationic lipid molecules and fusogenic/NLS peptide conjugates composed of a hydrophobic chain of about 10-20 amino acids and also containing four or more histidine residues or NLS at their one end. The encapsulated molecules display therapeutic efficacy in eradicating a variety of solid human tumors including but not limited to breast carcinoma and prostate carcinoma. Combination of the plasmids, oligonucleotides or negatively-charged drugs with other anti-neoplastic drugs (the positively-charged cis-platin, doxorubicin) encapsulated into liposomes are of therapeutic value. Also of therapeutic value in cancer eradication are combinations of encapsulated the plasmids, oligonucleotides or negatively-charged drugs with HSV-tk plus encapsulated ganciclovir.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. application Ser. No. 12/830,118, filed Jul. 2, 2010, now abandoned, which is a continuation of U.S. application Ser. No. 09/876,904, filed Jun. 8, 2001, now abandoned, which in turn claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application No. 60/210,925, filed Jun. 9, 2000, the content of each of which is hereby incorporated by reference into the present disclosure.


SEQUENCE LISTING
The instant application contains a Sequence Listing which has been submitted in ASCII format via EFS-Web and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Jan. 24, 2014, is named 062282-0202_SL.txt and is 126,633 bytes in size.
FIELD OF THE INVENTION
The present invention relates to the field of gene therapy and is specifically directed toward methods for producing peptide-lipid-polynucleotide complexes suitable for delivery of polynucleotides to a subject. The peptide-lipid-polynucleotide complexes so produced are useful in a subject for inhibiting the progression of neoplastic disease.
BACKGROUND OF THE INVENTION
Throughout this application various publications, patents and published patent specifications are referenced by author and date or by an identifying patent number. Full bibliographical citations for the publications are provided immediately preceding the claims. The disclosures of these publications, patents and published patent specifications are hereby incorporated by reference into the present disclosure to more fully describe the state of the art to which this invention pertains.
Gene therapy is a newly emerging field of biomedical research that holds great promise for the treatment of both acute and chronic diseases and has the potential to bring a revolutionary era to molecular medicine. However, despite numerous preclinical and clinical studies, routine use of gene therapy for the treatment of human disease has not yet been perfected. It remains an important unmet need of gene therapy to create gene delivery systems that effectively target specific cells of interest in a subject while controlling harmful side effects. Gene therapy is aimed at introducing therapeutically important genes into somatic cells of patients. Diseases already shown to be amenable to therapy with gene transfer in clinical trials include, cancer (melanoma, breast, lymphoma, head and neck, ovarian, colon, prostate, brain, chronic myelogenous leukemia, non-small cell lung, lung adenocarcinoma, colorectal, neuroblastoma, glioma, glioblastoma, astrocytoma, and others), AIDS, cystic fibrosis, adenosine deaminase deficiency, cardiovascular diseases (restenosis, familial hypercholesterolemia, peripheral artery disease), Gaucher disease, α1-antitrypsin deficiency, rheumatoid arthritis and others. Human diseases expected to be the object of clinical trials include hemophilia A and B, Parkinson's disease, ocular diseases, xeroderma pigmentosum, high blood pressure, obesity. ADA deficiency was the disease successfully treated by the first human “gene transfer” experiment conducted by Kenneth Culver in 1990. See, Culver, K. W. (1996) in: Gene Therapy: A Primer for Physicians, Second Ed., Mary Ann Liebert, Inc. Publ, New York, pp. 1-198.
The primary goals of gene therapy are to repair or replace mutated genes, regulate gene expression and signal transduction, manipulate the immune system, or target malignant and other cells for destruction. See, Anderson, W. F. (1992) Science 256:808-813; Lasic, D. (1997) in: Liposomes in Gene Delivery, CRC Press, pp. 1-295; Boulikas, T. (1998) Gene Ther. Mol. Biol. 1:1-172; Martin, F. and Boulikas, T. (1998) Gene Ther. Mol. Biol. 1:173-214; Ross, G. et al. (1996) Hum. Gene Ther. 7:1781-1790.
Human cancer presents a particular disease condition for which effective gene therapy methods would provide a particularly useful clinical benefit. Gene therapy concepts for treatment of such diseases include stimulation of immune responses as well as manipulation of a variety of alternative cellular functions that affect the malignant phenotype. Although many human tumors are non or weakly immunogenic, the immune system can be reinforced and instructed to eliminate cancer cells after transduction of a patient's cells ex vivo with the cytokine genes GM-CSF, IL-12, IL-2, IL-4, IL-7, IFN-γ, and TNF-α, followed by cell vaccination of the patient (e.g. intradermally) to potentiate T-lymphocyte-mediated antitumor effects (cancer immunotherapy). DNA vaccination with genes encoding tumor antigens and immunotherapy with synthetic tumor peptide vaccines are further developments that are currently being tested. The genes used for cancer gene therapy in human clinical trials include a number of tumor suppressor genes (p53, RB, BRCA1, E1A), antisense oncogenes (antisense c-fos, c-myc, K-ras), and suicide genes (HSV-tk, in combination with ganciclovir, cytosine deaminase in combination with 5-fluorocytosine). Other important genes that have been proposed for cancer gene therapy include bcl-2, MDR-1, p21, p16, bax, bcl-xs, E2F, IGF-I, VEGF, angiostatin, CFTR, LDL-R, TGF-β, and leptin. One major hurdle preventing successful implementation of these gene therapies is the difficulty of efficiently delivering an effective dose of polynucleotides to the site of the tumor. Thus, gene delivery systems with enhanced transfection capabilities would be highly advantageous.
A number of different vector technologies and gene delivery methods have been proposed and tested for delivering genes in vivo, including viral vectors and various nucleic acid encapsulation techniques. Alternative viral delivery vehicles for genes include murine retroviruses, recombinant adenoviral vectors, adeno-associated virus, HSV, EBV, HIV vectors, and baculovirus. Nonviral gene delivery methods use cationic or neutral liposomes, direct injection of plasmid DNA, and polymers. Various strategies to enhance efficiency of gene transfer have been tested such as fusogenic peptides in combination with liposomes or polymers to enhance the release of plasmid DNA from endosomes.
Each of the various gene delivery techniques has been found to possess different strengths and weaknesses. Recombinant retroviruses stably integrate into the chromosome but require host DNA synthesis to insert. Adenoviruses can infect non-dividing cells but cause immune reactions leading to the elimination of therapeutically transduced cells. Adeno-associated virus (AAV) is not pathogenic and does not elicit immune responses but new production strategies are required to obtain high AAV titers for preclinical and clinical studies. Wild-type AAVs integrate into chromosome 19, whereas recombinant AAVs are deprived of site-specific integration and may also persist episomally.
Herpes Simplex Virus (HSV) vectors can infect non-replicating cells, such as neuronal cells, and has a high payload capacity for foreign DNA but inflict cytotoxic effects. It seems that each delivery system will be developed independently of the others and that each will demonstrate strengths and weaknesses for certain applications. At present, retroviruses are most commonly used in human clinical trials, followed by adenoviruses, cationic liposomes and AAV.
As the challenges of perfecting gene therapy techniques have become apparent, a variety of additional delivery systems have been proposed to circumvent the difficulties observed with standard technologies. For example, cell-based gene delivery using polymer-encapsulated syngeneic or allogeneic cells implanted into a tissue of a patient can be used to secrete therapeutic proteins. This method is being tested in trials for amyotrophic lateral sclerosis using the ciliary neurotrophic factor gene, and may be extended to Factor VIII and IX for hemophilia, interleukin genes, dopamine-secreting cells to treat Parkinson's disease, nerve growth factor for Alzheimer's disease and other diseases. Other techniques under development include, vectors with the Cre-LoxP recombinase system to rid transfected cells of undesirable viral DNA sequences, use of tissue-specific promoters to express a gene in a particular cell type, or use of ligands recognizing cell surface molecules to direct gene vehicles to a particular cell type.
Additional methods that have been proposed for improving the efficacy of gene therapy technologies include designing p53 “gene bombs” that explode into tumor cells, exploiting the HIV-1 virus to engineer vectors for gene transfer, combining viruses with polymers or cationic lipids to improve gene transfer, the attachment of nuclear localization signal peptides to oligonucleotides to direct genes to nuclei, and the development of molecular switch systems allowing genes to be turned on or off at will. Nevertheless, because of the wide range of disease conditions for which gene therapies are required, and the complexities of developing treatments for such diseases, there remains a need for improved techniques for performing gene therapy. The present invention provides methods and compositions for addressing these issues.
DISCLOSURE OF THE INVENTION
A method is disclosed for encapsulating DNA and negatively charged drugs into liposomes having a different lipid composition between their inner and outer membrane bilayers. The liposomes are able to reach primary tumors and their metastases after intravenous injection to animals and humans. The method includes micelle formation between DNA with a mixture of cationic lipid and peptide molecules at molar ratios to nearly neutralization ratios in 10-90% ethanol; the cationic peptides specify nuclear localization and have a hydrophobic moiety endowed with membrane fusion to improve entrance across the cell membrane of the complex. These peptides insert with their cationic portion directed toward condensed DNA and their hydrophobic chain buried together with the hydrophobic chains of the lipids in the micelle membrane monolayer. The DNA/lipid/peptide micelles are converted into liposomes by mixing with pre-made liposomes or lipids followed by dilution in aqueous solutions and dialysis to remove the ethanol and allow liposome formation and extrusion through membranes to a diameter below 160 nm entrapping and encapsulating DNA with a very high yield. The encapsulated DNA has a high therapeutic efficacy in eradicating a variety of solid human tumors including, but not limited to, breast carcinoma and prostate carcinoma. A plasmid is constructed with DNA carrying anticancer genes including, but not limited to p53, RB, BRCA1, E1A, bcl-2, MDR-1, p21, p16, bax, bcl-xs, E2F, IGF-I VEGF, angiostatin, oncostatin, endostatin, GM-CSF, IL-12, IL-2, IL-4, IL-7, IFN-γ, TNF-α, HSV-tk (in combination with ganciclovir), E. coli cytosine deaminase (in combination with 5-fluorocytosine) and is combined with encapsulated cisplatin or with other similarly systemically delivered antineoplastic drugs to suppress cancer.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the structure of the cancer targeted liposome complex.
FIG. 2 illustrates the results of plasmid DNA condensation with various agents as well as various formulation of cationic liposomes in affecting the level of expression of the reporter beta-galactosidase gene after transfection of K562 human erythroleukemia cell cultures.
FIGS. 3A-3E illustrate tumor targeting in SCID mice. FIG. 3A shows a SCID mouse with a large and small human breast tumor before and after staining with X-Gal to test the expression of the transferred gene. Both tumors tum dark blue. The intensity of the blue color is proportional to the expression of the beta-galactosidase gene. FIG. 3B shows that in the initial staining of the small tumor, the skin and the intestines at the injection area are the first organs to tum blue. FIG. 3C is a view of the back of the animal. The two tumors are clearly visible after removal of the skin (top). Dark staining of the small tumor and light blue staining of the large tumor is evident at an initial stage of staining (bottom). FIG. 3D is a view of the front side of the animal. The two tumors are clearly visible after removal of the skin. On the figure to the bottom the dark staining of both tumors is evident at a later stage during staining. FIG. 3E shows the front (top) and rear (bottom) higher magnification view of the dark staining of both tumors at a later stage during staining. Staining of the vascular system around the small tumor can also be seen (bottom).



BRIEF DESCRIPTION OF THE TABLES
Table 1 is a list of molecules able to form micelles.
Table 2 lists several fusogenic peptides and describes their properties, along with a reference.
Table 3 lists simple Nuclear Localization Signal (NLS) peptides.
Table 4 shows a list of “bipartite” or “split” NLS peptides.
Table 5 lists “nonpositive NLS” peptides lacking clusters of arginines/lysines.
Table 6 lists peptides with nucleolar localization signals (NoLS).
Table 7 lists peptides having karyophilic clusters on non-membrane protein kinases.
Table 8 lists peptide nuclear localization signals on DNA repair proteins.
Table 9 lists NLS peptides in transcription factors.
Table 10 lists NLS peptides in other nuclear proteins.
MODES FOR CARRYING OUT THE INVENTION
Definitions
The practice of the present invention will employ, unless otherwise indicated, conventional techniques of immunology, molecular biology, microbiology, cell biology and recombinant DNA. These methods are described in the following publications. See, e.g., Sambrook, et al. MOLECULAR CLONING: A LABORATORY MANUAL, 2nd Edition (1989); CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, F. M. Ausubel, et al. eds., (1987); the series METHODS IN ENZYMOLOGY (Academic Press, Inc.); PCR: A PRACTICAL APPROACH, M. MacPherson, et al., IRL Press at Oxford University Press (1991); PCR 2: A PRACTICAL APPROACH, MacPherson et al., eds. (1995); ANTIBODIES, A LABORATORY MANUAL, Harlow and Lane, eds. (1988); and ANIMAL CELL CULTURE, R. I. Freshney, ed. (1987).
As used in the specification and claims, the singular form “a,” “an” and “the” include plural references unless the context clearly dictates otherwise. For example, the term “a cell” includes a plurality of cells, including mixtures thereof.
The term “comprising” is intended to mean that the compositions and methods include the recited elements, but not excluding others. “Consisting essentially of” when used to define compositions and methods, shall mean excluding other elements of any essential significance to the combination. Thus, a composition consisting essentially of the elements as defined herein would not exclude trace contaminants from the isolation and purification method and pharmaceutically acceptable carriers, such as phosphate buffered saline, preservatives, and the like. “Consisting of” shall mean excluding more than trace elements of other ingredients and substantial method steps for administering the compositions of this invention. Embodiments defined by each of these transition terms are within the scope of this invention.
The terms “polynucleotide” and “nucleic acid molecule” are used interchangeably to refer to polymeric forms of nucleotides of any length. The polynucleotides may contain deoxyribonucleotides, ribonucleotides, and/or their analogs. Nucleotides may have any three-dimensional structure, and may perform any function, known or unknown. The term “polynucleotide” includes, for example, single-, double-stranded and triple helical molecules, a gene or gene fragment, exons, introns, mRNA, tRNA, rRNA, ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes, and primers. A nucleic acid molecule may also comprise modified nucleic acid molecules.
A “gene” refers to a polynucleotide containing at least one open reading frame that is capable of encoding a particular polypeptide or protein after being transcribed and translated.
A “gene product” refers to the amino acid (e.g., peptide or polypeptide) generated when a gene is transcribed and translated.
The following abbreviations are used herein: DDAB: dimethyldioctadecyl ammonium bromide (same as N,N-distearyl-N,N-dimethylammonium bromide); DODAC: N,N-dioleyl-N,N-dimethylammonium chloride; DODAP: 1,2-dioleoyl-3-dimethylammonium propane; DMRIE: N-[1-(2,3-dimyristyloxy)propyl]-N,N-dimethyl-N-(2-hydroxyethyl) ammonium bromide; DMTAP: 1,2-dimyristoyl-3-trimethylammonium propane; DOGS: Dioctadecylamidoglycylspermine; DOTAP (same as DOTMA): N-(1-(2,3-dioleoyloxy)propyl)-N,N,N-trimethylammonium chloride; DOSPA: N-(1-(2,3-dioleyloxy)propyl)-N-(2-(sperminecarboxamido)ethyl)-N,N-dimethyl ammonium trifluoroacetate; DPTAP: 1,2-dipalmitoyl-3-trimethylammonium propane; DSTAP: 1,2-disteroyl-3-trimethylammonium propane; DOPE, 1,2-sn-dioleoylphoshatidylethanolamine; DC-Chol, 3β-(N—(N′,N′-dimethylaminoethane)carbamoyl)cholesterol. See, Gao et al., Biochem. Biophys. Res. Comm. 179:280-285 (1991).
As used herein, the term “pharmaceutically acceptable anion” refers to anions of organic and inorganic acids that provide non-toxic salts in pharmaceutical preparations. Examples of such anions include the halides anions, chloride, bromide, and iodide, inorganic anions such as sulfate, phosphate, and nitrate, and organic anions. Organic anions may be derived from simple organic acids, such as acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, malic acid, malonic acid, succinic acid, maleic, acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methane sulfonic acid, ethane sulfonic acid, p-toluenesulfonic acid, and the like. The preparation of pharmaceutically acceptable salts is described in Berge, et al., J. Pharm. Sci. 66:1-19 (1977), incorporated herein by reference.
Physiologically acceptable carriers, excipients or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA: sugar alcohols such as mannitol or sorbitol; salt-forming counter ions such as sodium; and/or nonionic surfactants such as Tween, Pluronics or polyethylene glycol (PEG). PEG molecules also contain a fusogenic peptide with an attached Nuclear Localization Signal (NLS) covalently linked to the end of the PEG molecule.
The term “cationic lipid” refers to any of a number of lipid species that carry a net positive charge at physiological pH. Such lipids include, but are not limited to, DDAB, DMRIE, DODAC, DOGS, DOTAP, DOSPA and DC-Chol. Additionally, a number of commercial preparations of cationic lipids are available that can be used in the present invention. These include, for example, LIPOFECTIN (commercially available cationic liposomes comprising DOTMA and DOPE, from GIBCO/BRL, Grand Island, N.Y., USA); LIPOFECTAMINE (commercially available cationic liposomes comprising DOSPA and DOPE, from GIBCO/BRL); and TRANSFECTAM (commercially available cationic lipids comprising DOGS in ethanol from Promega Corp., Madison, Wis., USA).
This invention further provides a number of methods for producing micelles with entrapped therapeutic drugs. The method is particularly useful to produce micelles of drugs or compositions having a net overall negative charge, e.g., DNA, RNA or negatively charged small molecules. For example, the DNA can be comprised within a plasmid vector and encode for a therapeutic protein, e.g., wild-type p53, HSV-tk, p21, Bax, Bad, IL-2, IL-12, GM-CSF, angiostatin, endostatin and oncostatin. In one embodiment, the method requires combining an effective amount of the therapeutic agent with an effective amount of cationic lipids. Cationic lipids useful in the methods of this invention include, but are not limited to, DDAB, dimethyldioctadecyl ammonium bromide; DMRIE: N-[1-(2,3-dimyristyloxy)propyl]-N,N-dimethyl-N-(2-hydroxyethyl) ammonium bromide; DMTAP: 1,2-dimyristoyl-3-trimethylammonium propane; DOGS: Dioctadecylamidoglycylspermine; DOTAP (same as DOTMA): N-(1-(2,3-dioleoyloxy)propyl)-N,N,N-trimethylammonium chloride; DPTAP: 1,2-dipalmitoyl-3-trimethylammonium propane; DSTAP: 1,2-disteroyl-3-trimethylammonium propane.
In one aspect, a ratio of from about 30 to about 90% of phosphates contained within the negatively charged therapeutic agent are neutralized by positive charges on lipid molecules (negative charges are in excess) to form an electrostatic micelle complex in an effective concentration of ethanol. In one aspect, the ethanol solution is from about 20% to about 80% ethanol. In a further aspect, the ethanol concentration is about 30%. The ethanol/cationic lipid/therapeutic agent complex is then combined with an effective amount of a fusogenic-karyophilic peptide conjugate. In one aspect, an effective amount of the conjugate is a ratio range from about 0.0 to about 0.3 (positive charges on peptide to negative charges on phosphate groups) to neutralize the majority of the remaining negative charges on the phosphate groups of the therapeutic agents thereby leading to an almost complete neutralization of the complex. The optimal conditions give to the complex a slightly negative charge. However, when the positive charges on cationic lipids exceed the negative charges on the DNA, the excess of positive charges are neutralized by DPPG (dipalmitoyl phosphatidyl glycerol) and its derivatives, or by other anionic lipid molecules in the final micelle complex.
In an alternative embodiment, the above methods can be modified by addition of DNA condensing agents selected from spermine, spermidine, and magnesium or other divalent metal ions neutralizing a certain percentage (1-20%) of phosphate groups.
In a further embodiment, the cationic lipids are combined with an effective amount of fusogenic lipid DOPE at various molar ratios for example, in a molar ratio of from about 1:1 cationic lipid:DOPE. In an alternative embodiment, the cationic lipids are combined with an effective amount of a fusogenic/NLS peptide conjugate. Examples of fusogenic/NLS peptide conjugates include, but are not limited to (KAWLKAF)3 (SEQ ID NO:1), GLFKAAAKLLKSLWKLLLKA (SEQ ID NO:2), LLLKAFAKLLKSLWKLLLKA (SEQ ID NO:3), as well as all derivatives of the prototype (Hydrophobic3-Karyophilic1-Hydrophobic2-Karyophilic1)2-3 where Hydrophobic is any of the A, I, L, V, P, G, W, F and Karyophilic is any of the K, R, or H, containing a positively-charged residue every 3rd or 4th amino acid, which form alpha helices and direct a net positive charge to the same direction of the helix. Additional examples include but are not limited to GLFKAIAGFIKNGWKGMIDGGGYC (SEQ ID NO:4) from influenza virus hemagglutinin HA-2; YGRKKRRQRRR (SEQ ID NO:5) from TAT of HIV; MSGTFGGILAGLIGLL(K/R/H)1-6 (SEQ ID NO:6), derived from the N-terminal region of the S protein of duck hepatitis B virus, but with the addition of one to six positively-charged lysine, arginine or histidine residues, and combinations of these, able to interact directly with the phosphate groups of plasmid or oligonucleotide DNA, compensating for part of the positive charges provided by the cationic lipids. GAAIGLAWIPYFGPAA (SEQ ID NO:7) is derived from the fusogenic peptide of the Ebola virus transmembrane protein; residues 53-70 (C-terminal helix) of apolipoprotein (apo) All peptide; the 23-residue fusogenic N-terminal peptide of HIV-1 transmembrane glycoprotein gp41; the 29-42-residue fragment from Alzheimer's β-amyloid peptide; the fusion peptide and N-terminal heptad repeat of Sendai virus; the 56-68 helical segment of lecithin cholesterol acyltransferase. Included within these embodiments are shorter versions of these peptides, that are known to induce fusion of unilamellar lipid vesicles or all that are similarly derivatized with the addition of one to six positively-charged lysine, arginine or histidine residues (K/R/H)1-6 able to interact directly with the phosphate groups of plasmid or oligonucleotide DNA, compensating for part of the positive charges provided by the cationic lipids. The fusogenic peptides in the fusogenic/NLS conjugates represent hydrophobic amino acid stretches, and smaller fragments of these peptide sequences, that include all signal peptide sequences used in membrane or secreted proteins that insert into the endoplasmic reticulum. Alternatively, the conjugates represent transmembrane domains and smaller fragments of these peptide sequences.
In one aspect of the invention, the NLS peptide component in fusogenic/NLS peptide conjugates is derived from the fusogenic hydrophobic peptides. However, there is an addition of 5-6 amino acid karyophilic Nuclear Localization Signals (NLS) derived from a number of known NLS peptides, as well as from searches of the nuclear protein databases, for stretches of five or more karyophilic amino acid stretches in proteins containing at least four positively-charged amino aids flanked by a proline (P) or glycine (G). Examples of NLS peptides are shown in Tables 1-8. The NLS peptide component in fusogenic/NLS peptide conjugates are synthetic peptides containing the above said NLS, but further modified by additional K, R, H residues at the central part of the peptide or with P or G at the N- or C-terminus.
In a further aspect, the fusogenic/NLS peptide conjugates are derived from the said fusogenic hydrophobic peptides but with the addition of a stretch of H4-6 (four to six histidine residues) in the place of NLS. Micelle formation takes place at pH 5-6 where histidyl residues are positively charged but lose their charge at the nearly neutral pH of the biological fluids, thus releasing the plasmid or oligonucleotide DNA from their electrostatic interaction.
The fusogenic peptide/NLS peptide conjugates are linked to each other with a short amino acid stretch representing an endogenous protease cleavage site.
In a preferred aspect of the invention, the structure of the preferred prototype fusogenic/NLS peptide conjugate used in this invention is: PKKRRGPSP(L/A/I)12-20 (SEQ ID NO:8), where (L/A/I)12-20 is a stretch of 12-20 hydrophobic amino acids containing A, L, I, Y, W, F and other hydrophobic amino acids.
The micelles made by the above methods are further provided by this invention by conversion into liposomes. An effective amount of liposomes (diameter from about 80 to about 160 nm), or of a lipid solution composed of cholesterol (from about 10% to about 50%), neutral phospholipid such as hydrogenated soy phosphatidylcholine (HSPC) (from about 40% to about 90%), and the derivatized vesicle-forming lipid PEG-DSPE (distearoylphosphatidyl ethanolamine) from about 1- to about 7 mole percent, is added to the micelle solution.
In a specific embodiment, the liposomes are composed of vesicle-forming lipids and between from about 1 to about 7 mole percent of distearoylphosphatidyl ethanolamine (DSPE) derivatized with a polyethyleneglycol. The composition of claim 20, wherein the polyethyleneglycol has a molecular weight is between about 1,000 to 5,000 daltons. Micelles are converted into liposomes with a concomitant decrease of the ethanol concentration which can be accomplished by removal of the ethanol by dialysis of the liposome complexes through permeable membranes or reduced to a diameter of 80-160 nm by extrusion through membranes.
Liposome encapsulated therapeutic agents produced by the above methods are further provided by this invention.
Also provided herein is a method for delivering a therapeutic agent such as plasmid DNA or oligonucleotides to a tissue cell in vivo by intravenous, or other type of injection of the micelles or liposomes. This method specifically targets a primary tumor and the metastases by the long circulating time of the micelle or liposome complex because of the exposure of PEG chains on its surface, its small size (80-160 nm) and the decrease in hydrostatic pressure in the solid tumor from the center to its periphery supporting a preferential extravasation through the tumor vasculature to the extracellular space in tumors. A method for delivering plasmid or oligonucleotide DNA across the cell membrane barrier of the tumors using the micelle or liposome complexes described herein is capable because of the presence of the fusogenic peptides in the complex. In particular, a method for delivering plasmid or oligonucleotide DNA to the liver, spleen and bone marrow after intravenous injection of the complexes is provided. Further provided is a method for delivering therapeutic genes to the liver, spleen and bone marrow of cancer and noncancer patients including but not limited to, factor VIII or IX for the therapy of hemophilias, multidrug resistance, cytokine genes for cancer immunotherapy, genes for the alleviation of pain, genes for the alleviation of diabetes and genes that can be introduced to liver, spleen and bone marrow tissue, to produce a secreted form of a therapeutic protein.
The disclosed therapies also provide methods for reducing tumor size by combining the encapsulated plasmid DNA carrying one or more anticancer genes selected from the group consisting of p53, RB, BRCA1, E1A, bcl-2, MDR-1, p21, p16, bax, bcl-xs, E2F, VEGF, angiostatin, oncostatin, endostatin, GM-CSF, IL-12, IL-2, IL-4, IL-7, IFN-γ, HSV-tk (in combination with ganciclovir), E. coli cytosine deaminase (in combination with 5-fluorocytosine) with encapsulated antisense oligonucleotides (antisense c-fos, c-myc, K-ras), ribozymes or triplex-forming oligonucleotides directed against genes that control the cell cycle or signaling pathways. These methods can be modified by combining the encapsulated plasmid DNA carrying one or more anticancer genes of with encapsulated or free antineoplastic drugs, consisting of the group of adriamycin, angiostatin, azathioprine, bleomycin, busulfane, camptothecin, carboplatin, carmustine, chlorambucile, chlormethamine, chloroquinoxaline sulfonamide, cisplatin, cyclophosphamide, cycloplatam, cytarabine, dacarbazine, dactinomycin, daunorubicin, didox, doxorubicin, endostatin, enloplatin, estramustine, etoposide, extramustinephosphat, flucytosine, fluorodeoxyuridine, fluorouracil, gallium nitrate, hydroxyurea, idoxuridine, interferons, interleukins, leuprolide, lobaplatin, lomustine, mannomustine, mechlorethamine, mechlorethaminoxide, melphalan, mercaptopurine, methotrexate, mithramycin, mitobronitole, mitomycin, mycophenolic acid, nocodazole, oncostatin, oxaliplatin, paclitaxel, pentamustine, platinum-triamine complex, plicamycin, prednisolone, prednisone, procarbazine, protein kinase C inhibitors, puromycine, semustine, signal transduction inhibitors, spiroplatin, streptozotocine, stromelysin inhibitors, taxol, tegafur, telomerase inhibitors, teniposide, thalidomide, thiamiprine, thioguanine, thiotepa, tiamiprine, tretamine, triaziquone, trifosfamide, tyrosine kinase inhibitors, uramustine, vidarabine, vinblastine, vinca alcaloids, vincristine, vindesine, vorozole, zeniplatin, zeniplatin, and zinostatin.
The following examples are intended to illustrate, but not limit the invention.
Liposome Composition
Liposomes are microscopic vesicles consisting of concentric lipid bilayers. Structurally, liposomes range in size and shape from long tubes to spheres, with dimensions from a few hundred Angstroms to fractions of a millimeter. Vesicle-forming lipids are selected to achieve a specified degree of fluidity or rigidity of the final complex providing the lipid composition of the outer layer. These are neutral (cholesterol) or bipolar and include phospholipids, such as phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and sphingomyelin (SM) and other type of bipolar lipids including but not limited to dioleoylphosphatidylethanolamine (DOPE), with a hydrocarbon chain length in the range of 14-22, and saturated or with one or more double C═C bonds. Examples of lipids capable of producing a stable liposome, alone, or in combination with other lipid components are phospholipids, such as hydrogenated soy phosphatidylcholine (HSPC), lecithin, phosphatidylethanolamine, lysolecithin, lysophosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, sphingomyelin, cephalin, cardiolipin, phosphatidic acid, cerebro sides, distearoylphosphatidylethanolamine (DSPE), dioleoylphosphatidylcholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), palmitoyloleoylphosphatidylcholine (POPC), palmitoyloleoylphosphatidylethanolamine (POPE) and dioleoylphosphatidylethanolamine 4-(N-maleimido-methyl)cyclohexane-1-carboxylate (DOPE-mal). Additional non-phosphorous containing lipids that can become incorporated into liposomes include stearylamine, dodecylamine, hexadecylamine, isopropyl myristate, triethanolamine-lauryl sulfate, alkyl-aryl sulfate, acetyl palmitate, glycerol ricinoleate, hexadecyl stereate, amphoteric acrylic polymers, polyethyloxylated fatty acid amides, and the cationic lipids mentioned above (DDAB, DODAC, DMRIE, DMTAP, DOGS, DOTAP (DOTMA), DOSPA, DPTAP, DSTAP, DC-Chol). Negatively charged lipids include phosphatidic acid (PA), dipalmitoylphosphatidylglycerol (DPPG), dioleoylphosphatidylglycerol and (DOPG), dicetylphosphate that are able to form vesicles. Preferred lipids for use in the present invention are cholesterol, hydrogenated soy phosphatidylcholine (HSPC) and, the derivatized vesicle-forming lipid PEG-DSPE.
Typically, liposomes can be divided into three categories based on their overall size and the nature of the lamellar structure. The three classifications, as developed by the New York Academy Sciences Meeting, “Liposomes and Their Use in Biology and Medicine,” December 1977, are multi-lamellar vesicles (MLVs), small uni-lamellar vesicles (SUVs) and large uni-lamellar vesicles (LUVs).
SUVs range in diameter from approximately 20 to 50 nm and consist of a single lipid bilayer surrounding an aqueous compartment. Unilamellar vesicles can also be prepared in sizes from about 50 nm to 600 nm in diameter. While unilamellar are single compartmental vesicles of fairly uniform size, MLVs vary greatly in size up to 10,000 nm, or thereabouts, are multi-compartmental in their structure and contain more than one bilayer. LUV liposomes are so named because of their large diameter that ranges from about 600 nm to 30,000 nm; they can contain more than one bilayer.
Liposomes may be prepared by a number of methods not all of which produce the three different types of liposomes. For example, ultrasonic dispersion by means of immersing a metal probe directly into a suspension of MLVs is a common way for preparing SUVs.
Preparing liposomes of the MLV class usually involves dissolving the lipids in an appropriate organic solvent and then removing the solvent under a gas or air stream. This leaves behind a thin film of dry lipid on the surface of the container. An aqueous solution is then introduced into the container with shaking, in order to free lipid material from the sides of the container. This process disperses the lipid, causing it to form into lipid aggregates or liposomes. Liposomes of the LUV variety may be made by slow hydration of a thin layer of lipid with distilled water or an aqueous solution of some sort. Alternatively, liposomes may be prepared by lyophilization. This process comprises drying a solution of lipids to a film under a stream of nitrogen. This film is then dissolved in a volatile solvent, frozen, and placed on a lyophilization apparatus to remove the solvent. To prepare a pharmaceutical formulation containing a drug, a solution of the drug is added to the lyophilized lipids, whereupon liposomes are formed.
Preparing Cationic Liposome/Cationic Peptide/Nucleic Acid Micelles
Cationic lipids, with the exception of sphingosine and some lipids in primitive life forms, do not occur in nature. The present invention uses single-chain amphiphiles which are chloride and bromide salts of the alkyltrimethylammonium surfactants including but not limited to C12 and C16 chains abbreviated DDAB (same as DODAB) or CTAB. The molecular geometry of these molecules determines the critical micelle concentration (ratio between free monomers in solution and molecules in micelles). Lipid exchange between the two states is a highly dynamic process; phospholipids have critical micelle concentration values below 10−8 M and are more stable in liposomes; however, single chain detergents, such as stearylamine, may emerge from the liposome membrane upon dilution or intravenous injection in milliseconds (Lasic, 1997).
Cationic lipids include, but are not limited to, DDAB: dimethyldioctadecyl ammonium bromide (same as N,N-distearyl-N,N-dimethylammonium bromide); DMRIE: N-[1-(2,3-dimyristyloxy)propyl]-N,N-dimethyl-N-(2-hydroxyethyl) ammonium bromide; DODAC: N,N-dioleyl-N,N-dimethylammonium chloride; DMTAP: 1,2-dimyristoyl-3-trimethylammonium propane; DODAP: 1,2-dioleoyl-3-dimethylammonium propane; DOGS: Dioctadecylamidoglycylspermine; DOTAP (same as DOTMA): N-(1-(2,3-dioleoyloxy)propyl)-N,N,N-trimethylammonium chloride; DOSPA: N-(1-(2,3-dioleyloxy)propyl)-N-(2-(sperminecarboxamido)ethyl)-N,N-dimethyl ammonium trifluoroacetate; DPTAP: 1,2-dipalmitoyl-3-trimethylammonium propane; DSTAP: 1,2-disteroyl-3-trimethylammonium propane; DC-Chol, 3β-(N—(N′,N′-dimethylaminoethane)carbamoyl)cholesterol.
Lipid-based vectors used in gene transfer have been formulated in one of two ways. In one method, the nucleic acid is introduced into preformed liposomes made of mixtures of cationic lipids and neutral lipids. The complexes thus formed have undefined and complicated structures and the transfection efficiency is severely reduced by the presence of serum. Preformed liposomes are commercially available as LIPOFECTIN and LIPOFECTAMINE. The second method involves the formation of DNA complexes with mono- or poly-cationic lipids without the presence of a neutral lipid. These complexes are prepared in the presence of ethanol and are not stable in water. Additionally, these complexes are adversely affected by serum (see, Behr, Acc. Chem. Res. 26:274-78 (1993)). An example of a commercially available poly-cationic lipid is TRANSFECTAM. Other efforts to encapsulate DNA in lipid-based formulations have not overcome these problems (see, Szoka et al., Ann. Rev. Biophys. Bioeng. 9:467 (1980); and Deamer, U.S. Pat. No. 4,515,736).
The nucleotide polymers can be single-stranded DNA or RNA, or double-stranded DNA or DNA-RNA hybrids. Examples of double-stranded DNA include structural genes, genes including control and termination regions, and self-replicating systems such as plasmid DNA. Particularly preferred nucleic acids are plasmids. Single-stranded nucleic acids include antisense oligonucleotides (complementary to DNA and RNA), ribozymes and triplex-forming oligonucleotides. In order to increase stability, some single-stranded nucleic acids will preferably have some or all of the nucleotide linkages substituted with stable, non-phosphodiester linkages, including, for example, phosphorothioate, phosphorodithioate, phosphoroselenate, methylphosphonate, or O-alkyl phosphotriester linkages.
Encapsulating Cationic Liposome/Cationic Peptide/Nucleic Acid Micelles into Neutral Liposomes
Cationic lipids used with fusogenic peptide/NLS conjugates to provide the inner layer of the particle can be any of a number of substances selected from the group of DDAB, DODAC, DMRIE, DMTAP, DOGS, DOTAP (DOTMA), DOSPA, DPTAP, DSTAP, DC-Chol. The cationic lipid is combined with DOPE. In one group of embodiments, the preferred cationic lipid is DDAB:DOPE 1:1.
Neutral lipids used herein to provide the outer layer of the particles can be any of a number of lipid species that exist either in an uncharged or neutral zwitterionic form at physiological pH. Such lipids are selected from a group consisting of diacylphosphatidylcholine, diacylphosphatidylethanolamine, ceramide, sphingomyelin, cephalin, and cerebrosides. In one group of embodiments, lipids containing saturated, mono-, or di-unsaturated fatty acids with carbon chain lengths in the range of C14 to C22 are preferred. In general, less saturated lipids are more easily sized, particularly when the liposomes must be sized below about 0.16 microns, for purposes of filter sterilization. Consideration of liposome size, rigidity and stability of the liposomes in the final preparation, its shelf life without leakage of the encapsulated DNA, and stability in the bloodstream generally guide the selection of neutral lipids for providing the outer coating of our gene vehicles. Lipids having a variety of acyl chain groups of varying chain length and degree of saturation are available or may be isolated or synthesized by well-known techniques. In another group of embodiments, lipids with carbon chain lengths in the range of C14 to C22 are used. Preferably, the neutral lipids used in the present invention are hydrogenated soy phosphatidylcholine (HSPC), cholesterol, and PEG-distearoylphosphatidyl ethanolamine (DSPE) or PEG-ceramide.
Methods for Preparing Liposomes
A variety of methods for preparing various liposome forms have been described in several issued patents, for example, U.S. Pat. Nos. 4,229,360; 4,224,179; 4,241,046; 4,737,323; 4,078,052; 4,235,871; 4,501,728; and 4,837,028, as well as in the articles Szoka et al., Ann. Rev. Biophys. Bioeng. 9:467 (1980) and Hope et al., Chem. Phys. Lip. 40:89 (1986). These methods do not produce all three different types of liposomes (MLVs, SUVs, LUVs). For example, ultrasonic dispersion by means of immersing a metal probe directly into a suspension of MLVs is a common way for preparing SUVs.
Preparing liposomes of the MLV class usually involves dissolving the lipids in an appropriate organic solvent and then removing the solvent under a gas or air stream. This leaves behind a thin film of dry lipid on the surface of the container. An aqueous solution is then introduced into the container with shaking, in order to free lipid material from the sides of the container. This process disperses the lipid, causing it to form into lipid aggregates or liposomes. Liposomes of the LUV variety may be made by slow hydration of a thin layer of lipid with distilled water or an aqueous solution of some sort. Alternatively, liposomes may be prepared by lyophilization. This process comprises drying a solution of lipids to a film under a stream of nitrogen. The film is then dissolved in a volatile solvent, frozen, and placed on a lyophilization apparatus to remove the solvent. To prepare a pharmaceutical formulation containing a drug, a solution of the drug is added to the lyophilized lipids, whereupon liposomes are formed.
Following liposome preparation, the liposomes may be sized to achieve a desired size range and relatively narrow distribution of liposome sizes. Preferably, the preformed liposomes are sized to a mean diameter of about 80 to 160 nm (the upper size limit for filter sterilization before in vivo administration). Several techniques are available for sizing liposomes to a desired size. Sonicating a liposome suspension either by bath or probe sonication produces a progressive size reduction down to small unilamellar vesicles less than about 0.05 microns (50 nm) in size. Extrusion of liposome through a small-pore polycarbonate is our preferred method for reducing liposome sizes to a relatively well-defined size distribution. The liposomes may be extruded through successively smaller-pore membranes, to achieve a gradual reduction in liposome size.
One way used to coat DNA with lipid is by controlled detergent depletion from a cationic lipid/DNA/detergent complex. This method can give complexes with stability in plasma. Hofland et al. (1996), have prepared such complexes by dialysis of a mixture of DOSPA/DOPE/DNA/octylglucoside.
Pharmaceutical compositions comprising the cationic liposome/nucleic acid complexes of the invention are prepared according to standard techniques and further comprise a pharmaceutically acceptable carrier. Generally, normal saline will be employed as the pharmaceutically acceptable carrier.
For in vivo administration, the pharmaceutical compositions are preferably administered parenterally, i.e., intravenously, intraperitoneally, subcutaneously, intrathecally, injection to the spinal cord, intramuscularly, intraarticularly, portal vein injection, or intratumorally. More preferably, the pharmaceutical compositions are administered intravenously or intratumorally by a bolus injection. In other methods, the pharmaceutical preparations may be contacted with the target tissue by direct application of the preparation to the tissue. The application may be made by topical “open” or “closed” procedures. The term “topical” means the direct application of the pharmaceutical preparation to a tissue exposed to the environment, such as the skin, to any surface of the body, nasopharynx, external auditory canal, ocular administration and administration to the surface of any body cavities, inhalation to the lung, genital mucosa and the like.
“Open” procedures are those procedures that include incising the skin of a patient and directly visualizing the underlying tissue to which the pharmaceutical preparations are applied. This is generally accomplished by a surgical procedure, such as a thoracotomy to access the lungs, abdominal laparotomy to access abdominal viscera, or other direct surgical approach to the target tissue.
“Closed” procedures are invasive procedures in which the internal target tissues are not directly visualized, but accessed via insertion of instruments through small wounds in the skin. For example, the preparations may be administered to the peritoneum by needle lavage. Likewise, the pharmaceutical preparations may be administered to the meninges or spinal cord by infusion during a lumbar puncture followed by appropriate positioning of the patient as commonly practiced for spinal anesthesia or metrazamide imaging of the spinal cord. Alternatively, the preparations may be administered through endoscopic devices.
EXAMPLES
Materials and Methods
DDAB, DOPE (dioleoylphosphatidylethanolamine) and most other lipids used here were purchased from Avanti Polar Lipids; PEG-DSPE was from Syngena.
Engineering of Plasmid pLF
The pGL3-C (Promega) was cut with XbaI and blunt-end ligated using the Klenow fragment of E. coli DNA polymerase. It was then cut with HindIII and the 1689-bp fragment, carrying the luciferase gene, was gel-purified. The pGFP-N1 plasmid (Clontech) was cut with SmaI and HindIII and the 4.7 kb fragment, isolated from an agarose gel, was ligated with the luciferase fragment. JM109 E. coli cells were transformed and 20 colonies were selected; about half of them showed the presence of inserts; 8 clones with inserts were cut with BamHI and XhoI to further confirm the presence of the luciferase gene; seven of them were positive.
Radiolabeled plasmid pLF was generated by culturing Escherichia coli in 3H-thymidine-5′-triphosphate or 32P inorganic phosphate (5 mCi) (Dupont/NEN, Boston, Mass.) and purified using standard techniques as described above.
DLS Measurements
A Coulter N4M light scattering instrument was used, at a 90° angle, set at a run time of 200 sec, using 4 to 25 microsec sample time. The scan of the particle size distribution was obtained in 1 ml sample volume using plastic cuvettes, at 20° C. and at 0.01 poise viscosity.
In one aspect, this invention provides a method for entrapping DNA into lipids that enhances the content of plasmid per volume unit, and reduces the toxicity of the cationic lipids used to trap plasmid or oligonucleotide DNA. The DNA becomes hidden in the inner membrane bilayer of the final complex. Furthermore, the gene transfer complex is endowed with long circulation time in body fluids and extravasates preferentially into solid tumors and their metastatic foci and nodules. The extravasation occurs through their vasculature at most sites of the human or animal body after intravenous injection of the gene-carrying vehicles. This occurs because of their small size (100-160 nm), their content in neutral to slightly negatively-charged lipids in their outer membrane bilayers, and their coating with PEG. These gene delivery vehicles are able to cross the cell membrane barrier after they reach the extracellular tumor space because of the presence of fusogenic peptides conjugated with karyophilic peptides. The vehicles assume a certain predefined orientation in the lipid membrane with their positive ends directed toward DNA and their hydrophobic tail buried inside the hydrophobic lipid bilayer. The labile NLS-fusogenic peptide linkage is cleaved after endocytosis and the remaining NLS peptide bound to plasmid DNA aids its nuclear uptake. This occurs especially when non-dividing cells are targeted, such as liver, spleen or bone marrow cells that represent the major sites for extravasation and concentration of these vehicles other than solid tumors.
Organic Solvent
A suitable solvent for preparing a micelle from the desired lipid components is ethanol, methanol, or other aliphatic alcohols such as propanol, isopropanol, butanol, tert-butanol, iso-butanol, pentanol and hexanol. Mixtures of two or more solvents may be used in the practice of the invention. It is also to be understood that any solvent that is miscible with an ethanol solution, even in small amounts, can be used to improve micelle formation and its subsequent conversion into liposomes, including chloroform, dichloromethane, di ethylether, cyclohexane, cyclopentane, benzene, and toluene.
Cationic Lipids
In a further embodiment, the liposome encapsulated DNA described herein further comprises an effective amount of cationic lipids. Cationic lipids have been widely used for gene transfer; a number of clinical trials (34 out of 220 total RAC-approved protocols as of December, 1997) use cationic lipids. Although many cell culture studies have been documented, systemic delivery of genes with cationic lipids in vivo has been very limited. All clinical protocols use subcutaneous, intradermal, intratumoral, and intracranial injection as well as intranasal, intrapleural, or aerosol administration but not I.V. delivery, because of the toxicity of the cationic lipids and DOPE (see, Martin and Boulikas, 1998). Liposomes formulated from DOPE and cationic lipids based on diacyltrimethylammonium propane (dioleoyl-, dimyristoyl-, dipalmitoyl-, disteroyl-trimethylammonium propane or DOTAP, DMTAP, DPTAP, DSTAP, respectively) or DDAB were highly toxic when incubated in vitro with phagocytic cells (macrophages and U937 cells), but not towards non-phagocytic T lymphocytes. The rank order of toxicity was DOPE/DDAB>DOPE/DOTAP>DOPE/DMTAP>DOPE/DPTAP>DOPE/DSTAP; and the toxicity was determined from the effect of the cationic liposomes on the synthesis of nitric oxide (NO) and TNF-α produced by activated macrophages (Filion and Phillips, 1997).
Another aspect to be considered before I.V. injection is undertaken, is that negatively charged serum proteins can interact and cause inactivation of cationic liposomes (Yang and Huang, 1997). Condensing agents used for plasmid delivery including polylysine, transferrin-polylysine, a fifth-generation poly(amidoamine) (PAMAM) dendrimer, poly(ethyleneimine), and several cationic lipids (DOTAP, DC-Chol/DOPE, DOGS/DOPE, and DOTMA/DOPE), were found to activate the complement system to varying extents. Strong complement activation was seen with long-chain polylysines, the dendrimer, poly(ethyleneimine), and DOGS. Modifying the surface of preformed DNA complexes with polyethyleneglycol (Plank et al., 1996) considerably reduced complement activation.
Cationic lipids increase the transfection efficiency by destabilizing the biological membranes, including plasma, endosomal, and lysosomal membranes. Incubation of isolated lysosomes with low concentrations of DOTAP caused a striking increase in free activity of β-galactosidase, and even a release of the enzyme into the medium. This demonstrates that the lysosomal membrane is deeply destabilized by the lipid. The mechanism of destabilization was thought to involve an interaction between cationic liposomes and anionic lipids of the lysosomal membrane, thus allowing a fusion between the lipid bilayers. The process was less pronounced at pH 5 than at pH 7.4, and anionic amphipathic lipids were able to prevent partially this membrane destabilization (Wattiaux et al., 1997).
In contrast to DOTAP and DMRIE that were 100% charged at pH 7.4, DC-CHOL was only about 50% charged as monitored by a pH-sensitive fluorophore. This difference decreases the charge on the external surfaces of the liposomes, and was proposed to promote an easier dissociation of bilayers containing DC-CHOL from the plasmid DNA, and an increase in release of the DNA-lipid complex into the cytosol from the endosomes (Zuidam and Barenholz, 1997).
Although cationic lipids have been used widely for the delivery of genes, very few studies have used systemic I.V. injection of cationic liposome-plasmid complexes. This is because of the toxicity of the lipid component in animal models, not humans. Administration by I.V. injection of two types of cationic lipids of similar structure, DOTMA and DOTAP, shows that the transfection efficiency is determined mainly by the structure of the cationic lipid and the ratio of cationic lipid to DNA; the luciferase and GFP gene expression in different organs was transient, with a peak level between 4 and 24 hr, dropping to less than 1% of the peak level by day 4 (Song et al., 1997).
A number of different organs in vivo can be targeted after liposomal delivery of genes or oligonucleotides. Intravenous injection of cationic liposome-plasmid complexes by tail vein in mice, targeted mainly the lung and to a smaller extent the liver, spleen, heart, kidney and other organs (Zhu et al., 1993). Intraperitoneal injection of a plasmid-liposome complex expressing antisense K-ras RNA in nude mice inoculated i.p. with AsPC-1 pancreatic cancer cells harboring K-ras point mutations and PCR analysis indicated that the injected DNA was delivered to various organs except brain (Aoki et al., 1995).
A number of factors for DOTAP:cholesterol/DNA complex preparation including the DNA:liposome ratio, mild sonication, heating, and extrusion were found to be crucial for improved systemic delivery; maximal gene expression was obtained when a homogeneous population of DNA:liposome complexes between 200 to 450 nm in size were used. Cryo-electron microscopy showed that the DNA was condensed on the interior of invaginated liposomes between two lipid bilayers in these formulations, a factor that was thought to be responsible for the high transfection efficiency in vivo and for the broad tissue distribution (Templeton et al., 1997).
Steps to improve liposome-mediated gene delivery to somatic cells include, persistence of the plasmid in blood circulation, port of entry and transport across the cell membrane, release from endosomal compartments into the cytoplasm, nuclear import by docking through the pore complexes of the nuclear envelope, expression driven by the appropriate promoter/enhancer control elements, and persistence of the plasmid in the nucleus for long periods (Boulikas, 1998a).
Plasmid Condensation with Spermine
In a further embodiment, the liposome encapsulated DNA described herein is condensed with spermine and/or spermidine. DNA can be presented to cells in culture as a complex with polycations such as polylysine, or basic proteins such as protamine, total histones or specific histone fractions, protamine (Boulikas and Martin, 1997). The interaction of plasmid DNA with protamine sulfate, followed by the addition of DOTAP cationic liposomes, offered a better protection of plasmid DNA against enzymatic digestion. The method gave consistently higher gene expression in mice via tail vein injection as compared with DOTAP/DNA complexes. 50 μg of luciferase-plasmid per mouse gave 20 ng luciferase protein per mg extracted tissue protein in the lung, that was detected as early as 1 h after injection, peaked at 6 h and declined thereafter. Intraportal injection of protamine/DOTAP/DNA led to about a 100-fold decrease in gene expression in the lung as compared with I.V. injection. Endothelial cells were the primary locus of lacZ transgene expression (Li and Huang, 1997). Protamine sulfate enhanced plasmid delivery into several different types of cells in vitro, using the monovalent cationic liposomal formulations (DC-Chol and lipofectin). This effect was less pronounced with the multivalent cationic liposome formulation, lipofectamine (Sorgi et al., 1997).
Spermine is found to enhance the transfection efficiency of DNA-cationic liposome complexes in cell culture and in animal studies. This biogenic polyamine at high concentrations caused liposome fusion most likely promoted by the simultaneous interaction of one molecule of spermine (four positively charged amino groups) with the polar head groups of two or more molecules of lipids. At low concentrations (0.03-0.1 mM) it promoted anchorage of the liposome-DNA complex to the surface of cells and enhanced significantly transfection efficiency (Boulikas, unpublished).
The polycations polybrene, protamine, DEAE-dextran, and poly-L-lysine significantly increased the efficiency of adenovirus-mediated gene transfer in cell culture. This was thought to act by neutralizing the negative charges presented by membrane glycoproteins that reduce the efficiency of adenovirus-mediated gene transfer (Arcasoy et al., 1997).
Oligonucleotide Transfer
In a further embodiment, the liposome encapsulates oligonucleotide DNA. Encapsulation of oligonucleotides into liposomes increased their therapeutic index, prevented degradation in cultured cells, and in human serum and reduced toxicity to cells (Thierry and Dritschilo, 1992; Capaccioli et al., 1993; Lewis et al., 1996). However, most studies have been performed in cell culture, and very few in animals in vivo. There are still an important number of improvements needed before these approaches can move into clinical studies.
Zelphati and Szoka (1997), have found that complexes of fluorescently labeled oligonucleotides with DOTAP liposomes, entered the cell using an endocytic pathway mainly involving uncoated vesicles. Oligonucleotides were redistributed from punctate cytoplasmic regions into the nucleus. This process was independent of acidification of the endosomal vesicles. The nuclear uptake of oligonucleotides depended on several factors, such as charge of the particle, where positively charged complexes were required for enhanced nuclear uptake. DOTAP increased over 100 fold the antisense activity of a specific anti-luciferase oligonucleotide. Physicochemical studies of oligonucleotide-liposome complexes of different cationic lipid compositions indicated that either phosphatidylethanolamine or negative charges on other lipids in the cell membrane are required for efficient fusion with cationic liposome-oligonucleotide complexes to promote entry to the cell (Jaaskelainen et al., 1994).
Similar results were reported by Lappalainen et al. (1997). Digoxigenin-labeled oligodeoxynucleotides (ODNs) complexed with the polycationic DOSPA and the monocationic DDAB (with DOPE as a helper lipid) were taken up by CaSki cells in culture by endocytosis. The nuclear membrane was found to pose a barrier against nuclear import of ODNs that accumulated in the perinuclear area. Although DOSPA/DOPE liposomes could deliver ODNs into the cytosol, they were unable to mediate nuclear import of ODNs. On the contrary, oligonucleotide-DDAB/DOPE complexes with a net positive charge were released from vesicles into the cytoplasm. It was determined that DDAB/DOPE mediated nuclear import of the oligonucleotides.
DOPE-heme (ferric protoporphyrin IX) conjugates, inserted in cationic lipid particles with DOTAP, protected oligoribonucleotides from degradation in human serum and increased oligoribonucleotide uptake into 2.2.15 human hepatoma cells. The enhancing effect of heme was evident only at a net negative charge in the particles (Takle et al., 1997). Uptake of liposomes labeled with 111In and composed of DC-Chol and DOPE was primarily by liver, with some accumulation in spleen and skin and very little in the lung after I.V. tail injection. Preincubation of cationic liposomes with phosphorothioate oligonucleotide induced a dramatic, yet transient, accumulation of the lipid in lung that gradually redistributed to liver. The mechanism of lung uptake involved entrapment of large aggregates of oligonucleotides within pulmonary capillaries at 15 min post-injection via embolism. Labeled oligonucleotide was localized primarily to phagocytic vacuoles of Kupffer cells at 24 h post-injection. Nuclear uptake of oligonucleotides in vivo was not observed (Litzinger et al., 1996).
Polyethylene Glycol (PEG)-Coated Liposomes
In a further embodiment, the liposome encapsulated DNA described herein, further comprise coating of the final complex in step 2 (FIG. 1) with PEG. It is often desirable to conjugate a lipid to a polymer that confers extended half-life, such as polyethylene glycol (PEG). Derivatized lipids that are employed, include PEG-modified DSPE or PEG-ceramide. Addition of PEG components prevents complex aggregation, increases circulation lifetime of particles (liposomes, proteins, other complexes, drugs) and increases the delivery of lipid-nucleic acid complexes to the target tissues. See, Maxfield et al., Polymer 16:505-509 (1975); Bailey, F. E. et al., in: Nonionic Surfactants, Schick, M. J., ed., pp. 794-821 (1967); Abuchowski, A. et al., J Biol. Chem. 252:3582-3586 (1977); Abuchowski, A. et al., Cancer Biochem. Biophys. 7:175-186 (1984); Katre, N. V. et al., Proc. Natl. Acad. Sci. USA 84:1487-1491 (1987); Goodson, R. et al. Bio Technology 8:343-346 (1990).
Conjugation to PEG is reported to have reduced immunogenicity and toxicity. See, Abuchowski et al., J. Biol. Chem. 252:3578-3581 (1977). The extent of enhancement of blood circulation time of liposomes, by coating with PEG is described in U.S. Pat. No. 5,013,556. Typically, the concentration of the PEG-modified phospholipids, or PEG-ceramide in the complex will be about 1-7%. In a particularly preferred embodiment, the PEG-modified lipid is a PEG-DSPE.
Coating the surface of liposomes with inert materials designed to camouflage the liposome from the body's host defense systems was shown to increase remarkably the plasma longevity of liposomes. The biological paradigm for this “surface modified” sub-branch was the erythrocyte, a cell that is coated with a dense layer of carbohydrate groups, and that manages to evade immune system detection and to circulate for several months (before being removed by the same type of cell responsible for removing liposomes).
The first breakthrough came in 1987 when a glycolipid (the brain tissue-derived ganglioside GM 1), was identified that, when incorporated within the lipid matrix, allowed liposomes to circulate for many hours in the blood stream (Allen and Chonn, 1987). A second glycolipid, phosphatidylinositol, was also found to impart long plasma residence times to liposomes and, since it was extracted from soybeans, not brain tissue, was believed to be a more pharmaceutically acceptable excipient (Gabizon et al., 1989).
A major advance in the surface-modified sub-branch was the development of polymer-coated liposomes (Allen et al. 1991). Polyethylene glycol (PEG) modification had been used for many years to prolong the half-lives of biological proteins (such as enzymes and growth factors) and to reduce their immunogenicity (e.g. Beauchamp et al., 1983). It was reported in the early 1990s that PEG-coated liposomes circulated for remarkably long times after intravenous administration. Half-lives on the order of 24 h were seen in mice and rats, and over 30 hours in dogs. The term “stealth” was applied to these liposomes because of their ability of evade interception by the immune system. The PEG hydrophilic polymers form dense “conformational clouds” to prevent other macromolecules from interaction with the surface, even at low concentrations of the protecting polymer (Gabizon and Papahadjopoulos, 1988; Papahadjopoulos et al., 1991; reviewed by Torchilin, 1998). The increased hydrophilicity of the liposomes after their coating with the amphipathic PEG5000 leads to a reduction in nonspecific uptake by the reticuloendothelial system.
Whereas the half-life of antimyosin immunoliposomes was 40 min, by coating with PEG, they increased their half-life to 1000 min after intravenous injection to rabbits (Torchilin et al., 1992).
Micelles, Surfactants and Small Unilamellar Vesicles
In a further embodiment, the liposome encapsulated DNA described herein, further comprise an initial step of micelle formation between cationic lipids and condensed plasmid or oligonucleotide DNA in ethanol solutions. Micelles are small amphiphilic colloidal particles formed by certain kinds of lipid molecules, detergents or surfactants under defined conditions of concentration, solvent and temperature. They are composed of a single lipid layer. Micelles can have their hydrophilic head groups assembled exposing their hydrophobic tails to the solvent (for example in 30-60% aqueous ethanol solution) or can reverse their structures exposing their polar heads toward the solvent such as by lowering the concentration of the ethanol to below 10% (reverse micelles). Micelle systems are in thermodynamic equilibrium with the solvent molecules and environment. This results in constant phase changes, especially upon contact with biological materials, such as upon introduction to cell culture, injection to animals, dilution, contact with proteins or other macromolecules. These changes result in rapid micelle disassembly or flocculation. This is in contrast to the much higher stability of liposome bilayers.
Single-chain surfactants are able to form micelles (see Table 1, below). These include the anionic (sodium dodecyl sulfate, cholate or oleate) or cationic (cetyl-trimethylammonium bromide, CTAB) surfactants. CTAB, CTAC, and DOIC micelles yielded larger solubility gaps (lower concentration of colloidally suspended DNA) than corresponding SUV particles containing neutral lipid and CTAB (1:1) (Lasic, 1997).







TABLE 1







Molecules able to form micelles








Molecule
Reference





CTAB, CTAC, DOIC
Lasic, 1997


Detergent/phospholipid micelles
Lusa et al., 1998


Dodecyl betaine (amphoteric surfactant)
de la Maza et al., 1998


Dodecylphosphocholine cholate
Lasic, 1997


Glycine-conjugated bile salt (anionic steroid detergent-like molecule)
Leonard and Cohen, 1998


Lipid-dodecyl maltoside micelles
Lambert et al., 1998


mixed micelles (Triton X-100 & phosphatidylcholine)
Lopez et al., 1998


Octylglucoside (non-ionic straight chain detergent)
Leonard and Cohen, 1998


Oleate
Lasic, 1997


PEG-dialkylphosphatidic acid (dihexadecylphosphatidyl (DHP)-
Tirosh et al., 1998


PEG2000)


Phosphatidylcholine (neutral zwitterionic)
Schroeder et al., 1990


Polyethyleneglycol (MW 5000)-distearoyl phosphatidyl ethanolamine
Weissig et al., 1998


(PEG-DSPE)


sodium dodecyl sulfate (anionic straight chain detergent)
Leonard and Cohen, 1998


Sodium taurofusidate (conjugated fungal bile salt analog)
Leonard and Cohen, 1998


Taurine-conjugated bile salts (anionic steroid detergent-like
Leonard and Cohen, 1998


molecule)


Triton X-100 surfactant
Lasic, 1997









There is a critical detergent/phospholipid ratio at which lamellar-to-micellar transition occurs. For example, the vesicle-micelle transition was observed for dodecyl maltoside with large unilamellar liposomes. A striking feature of the solubilization process by dodecyl maltoside was the discovery of a new phase, consisting of a very viscous “gel-like” structure composed of long filamentous thread-like micelles, over 1 to 2 microns in length.
A long circulating complex needs to be slightly anionic. Therefore the liposomes used for the conversion of the micelles into liposomes contain bipolar lipids (PC, PE) and 1-30% negatively charged lipids (DPPG). The cationic lipids which are toxic, are hidden in the inner liposome membrane bilayer. Those reaching the solid tumor will exert their toxic effects causing apoptosis. Apoptosis will be caused by the delivery of the toxic drug or anti-neoplastic gene or oligonucleotide to the cancer cell but also by the nuclear localization of the cationic lipids (along with plasmid DNA) to the nucleus. Indeed, a number of studies suggest that plasmid DNA is imported to nuclei; its translocation docks cationic lipid molecules electrostatically attached to the DNA. These cationic lipid molecules exert their toxicity by interfering with the nucleosome and domain structure of the chromatin causing local destabilization. This disturbance or aberrant chromatin reorganization could be exerted at the level of the nuclear matrix where plasmid DNA is attached for transcription, autonomous replication, or integration via recombination.
Surfactants have found wide application in formulations such as emulsions (including microemulsions) and liposomes. The most common way of classifying and ranking the properties of the many different types of surfactants, both natural and synthetic, is by the use of the hydrophile/lipophile balance (HLB). The use of surfactants in drug products, formulations and in emulsions has been reviewed (Rieger, in: Pharmaceutical Dosage Forms, Marcel Dekker, Inc., New York, 1988, p. 285).
Nonionic surfactants find wide application in pharmaceutical and cosmetic products and are usable over a wide range of pH values. In general, their HLB values range from 2 to about 18, depending on their structure. Nonionic surfactants include, nonionic esters such as ethylene glycol esters, propylene glycol esters, glyceryl esters, polyglyceryl esters, sorbitan esters, sucrose esters, and ethoxylated esters. Nonionic alkanolamides and ethers, such as fatty alcohol ethoxylates, propoxylated alcohols, and ethoxylated/propoxylated, block polymers are also included in this class. The polyoxyethylene surfactants are the most popular members of the nonionic surfactant class.
Anionic surfactants include carboxylates such as soaps, acyl lactylates, acyl amides of amino acids, esters of sulfuric acid such as alkyl sulfates and ethoxylated alkyl sulfates, sulfonates such as alkyl benzene sulfonates, acyl isethionates, acyl taurates and sulfosuccinates, and phosphates. The most important members of the anionic surfactant class are the alkyl sulfates and the soaps.
Cationic surfactants include quaternary ammonium salts and ethoxylated amines. The quaternary ammonium salts are the most used members of this class. If the surfactant molecule has the ability to carry either a positive or negative charge, the surfactant is classified as amphoteric. Amphoteric surfactants include acrylic acid derivatives, substituted alkylamides, N-alkylbetaines and phosphatides.
Classical micelles may not be effective as gene transfer vehicles, but important intermediates in the formation of liposome complexes encapsulating drugs or nucleic acids. The stability of single chain surfactants-DNA-colloidal systems is lower than SUV particles containing neutral lipid and CTAB (1:1). However, second generation micelles are able to target tumors in vivo. Weissig and co-workers (1998) used the soybean trypsin inhibitor (STI) as a model protein to target tumors. STI was modified with a hydrophobic residue of N-glutaryl-phosphatidyl-ethanolamine (NGPE) and incorporated into both polyethyleneglycol (MW 5000)-distearoyl phosphatidyl ethanolamine (PEG-DSPE) micelles (<20 nm) and PEG-DSPE-modified long-circulating liposomes (ca. 100 nm). As determined from the protein label by using 111In attached to soybean trypsin inhibitor via protein-attached diethylene triamine pentaacetic acid, DTPA, PEG-lipid micelles accumulated better than the same protein anchored in long-circulating PEG-liposomes in subcutaneously established Lewis lung carcinoma in mice after tail vein injection.
Loading a liposomal dispersion with an amphiphilic drug may cause a phase transformation into a micellar solution. The transition from high ratios of phospholipid to drug (from 2:1 to 1:1 downwards) were accompanied by the conversion of liposomal dispersions of milky-white appearance (particle size 200 nm) to nearly transparent micelles (particle size below 25 nm). See, Schutze and Muller-Goymann (1998).
Fusogenic Peptides
In a further embodiment, the liposome encapsulated DNA described herein further comprises an effective amount of a fusogenic peptide. Fusogenic peptides belong to a class of helical amphipathic peptides characterized by a hydrophobicity gradient along the long helical axis. This hydrophobicity gradient causes the tilted insertion of the peptides in membranes, thus destabilizing the lipid core and, thereby, enhancing membrane fusion (Decout et al., 1999).
Hemagglutinin (HA) is a homotrimeric surface glycoprotein of the influenza virus. In infection, it induces membrane fusion between viral and endosomal membranes at low pH. Each monomer consists of the receptor-binding HA1 domain and the membrane-interacting HA2 domain. The NH2-terminal region of the HA2 domain (amino acids 1 to 127), the so-called “fusion peptide,” inserts into the target membrane and plays a crucial role in triggering fusion between the viral and endosomal membranes. Based on the substitution of eight amino acids in region 5-14 with cysteines and spin-labeling electron paramagnetic resonance, it was concluded that the peptide forms an alpha-helix tilted approximately 25 degrees from the horizontal plane of the membrane with a maximum depth of 15 Å from the phosphate group (Macosko et al., 1997). Use of fusogenic peptides from influenza virus hemagglutinin HA-2 enhanced greatly the efficiency of transferrin-polylysine-DNA complex uptake by cells. The peptide was linked to polylysine and the complex was delivered by the transferrin receptor-mediated endocytosis (reviewed by Boulikas, 1998a). This peptide has the sequence: GLFEAIAGFI ENGWEGMIDG GGYC (SEQ ID NO:9) and is able to induce the release of the fluorescent dye calcein from liposomes prepared with egg yolk phosphatidylcholine, which was higher at acidic pH. This peptide was also able to increase up to 10-fold the anti-HIV potency of antisense oligonucleotides, at a concentration of 0.1-1 mM, using CEM-SS lymphocytes in culture. This peptide changes conformation at the slightly more acidic environment of the endosome, destabilizing and breaking the endosomal membrane (reviewed by Boulikas, 1998a).
The presence of negatively charged lipids in the membrane is important for the manifestation of the fusogenic properties of some peptides, but not of others. Whereas the fusogenic action of a peptide, representing a putative fusion domain of fertilin, a sperm surface protein involved in sperm-egg fusion, was dependent upon the presence of negatively charged lipids, that of the HIV2 peptide was not (Martin and Ruysschaert, 1997).
For example, to analyze the two domains on the fusogenic peptides of influenza virus hemagglutinin HA, HA-chimeras were designed in which the cytoplasmic tail and/or transmembrane domain of HA was replaced with the corresponding domains of the fusogenic glycoprotein F of Sendai virus. Constructs of HA were made in which the cytoplasmic tail was replaced by peptides of human neurofibromin type 1 (NF1) (residues 1441 to 1518) or c-Raf-1, (residues 51 to 131) and were expressed in CV-1 cells by using the vaccinia virus-T7 polymerase transient-expression system. Membrane fusion between CV-1 cells and bound human erythrocytes (RBCs) mediated by parental or chimeric HA proteins showed that, after the pH was lowered, a flow of the aqueous fluorophore calcein from preloaded RBCs into the cytoplasm of the protein-expressing CV-1 cells took place. This indicated that membrane fusion involves both leaflets of the lipid bilayers and leads to formation of an aqueous fusion pore (Schroth-Diaz et al., 1998).
A remarkable discovery was that the TAT protein of HIV is able to cross cell membranes (Green and Loewenstein, 1998) and that a 36-amino acid domain of TAT, when chemically cross-linked to heterologous proteins, conferred the ability to transduce into cells. The 11-amino acid fusogenic peptide of TAT (YGRKKRRQRRR (SEQ ID NO:10)) is a nucleolar localization signal (see Boulikas, 1998b).
Another protein of HIV, the glycoprotein gp41, contains fusogenic peptides. Linear peptides derived from the membrane proximal region of the gp41 ectodomain have potential applications as anti-HIV agents and inhibit infectivity by adopting a helical conformation (Judice et al., 1997). The 23 amino acid residue, N-terminal peptide of HIV-1 gp41 has the capacity to destabilize negatively charged large unilamellar vesicles. In the absence of cations, the main structure was a pore-forming alpha-helix, whereas in the presence of Ca2+ the conformation switched to a fusogenic, predominantly extended beta-type structure. The fusion activity of HIV(ala) (bearing the R22→A substitution) was reduced by 70%, whereas fusogenicity was completely abolished when a second substitution (V2→E) was included, arguing that it is not an alpha-helical but an extended structure adopted by the HIV-1 fusion peptide that actively destabilizes cholesterol-containing, electrically neutral membranes (Pereira et al., 1997).
The prion protein (PrP) is a glycoprotein of unknown function normally found at the surface of neurons and of glial cells. It is involved in diseases such as bovine spongiform encephalopathy, and Creutzfeldt-Jakob disease in humans, where PrP is converted into an altered form (termed PrPSc). According to computer modeling calculations, the 120 to 133 and 118 to 135 domains of PrP are tilted lipid-associating peptides inserting in a oblique way into a lipid bilayer and able to interact with liposomes to induce leakage of encapsulated calcein (Pillot et al., 1997b).
The C-terminal fragments of the Alzheimer amyloid peptide (amino acids 29-40 and 29-42) have properties related to those of the fusion peptides of viral proteins inducing fusion of liposomes in vitro. These properties could mediate a direct interaction of the amyloid peptide with cell membranes and account for part of the cytotoxicity of the amyloid peptide. In view of the epidemiologic and biochemical linkages between the pathology of Alzheimer's disease and apolipoprotein E (apoE) polymorphism, examination of the potential interaction between the three common apoE isoforms and the C-terminal fragments of the amyloid peptide showed that only apoE2 and apoE3, not apoE4, are potent inhibitors of the amyloid peptide fusogenic and aggregational properties. The protective effect of apoE against the formation of amyloid aggregates was thought to be mediated by the formation of stable apoE/amyloid peptide complexes (Pillot et al., 1997a; Lins et al., 1999).
The fusogenic properties of an amphipathic net-negative peptide (WAE 11), consisting of 11 amino acid residues were strongly promoted when the peptide was anchored to a liposomal membrane. The fusion activity of the peptide appeared to be independent of pH and membrane merging, and the target membranes required a positive charge that was provided by incorporating lysine-coupled phosphatidylethanolamine (PE-K). Whereas the coupled peptide could cause vesicle aggregation via nonspecific electrostatic interaction with PE-K, the free peptide failed to induce aggregation of PE-K vesicles (Pecheur et al., 1997).
A number of studies suggest that stabilization of an alpha-helical secondary structure of the peptide after insertion in lipid bilayers in membranes of cells or liposomes is responsible for the membrane fusion properties of peptides. Zn2+, enhances the fusogenic activity of peptides because it stabilizes the alpha-helical structure. For example, the HEXXH (SEQ ID NO:11) domain of the salivary antimicrobial peptide, located in the C-terminal functional domain of histatin-5, a recognized zinc-binding motif is in a helicoidal conformation (Martin et al., 1999; Melino et al., 1999; Curtain et al., 1999).
Fusion peptides have been formulated with DNA plasmids to create peptide-based gene delivery systems. A combination of the YKAKnWK (SEQ ID NO:12) peptide, used to condense plasmids into 40 to 200 nm nanoparticles, with the GLFEALLELLESLWELLLEA (SEQ ID NO:13) amphipathic peptide, that is a pH-sensitive lytic agent designed to facilitate release of the plasmid from endosomes enhanced expression systems containing the beta-galactosidase reporter gene (Duguid et al., 1998). See Table 2, below.







TABLE 2







Fusogenic peptides










Fusogenic peptide
Source Protein
Properties
Reference





GLFEAIAGFIENGWEG
Influenza virus
Endowed with membrane
Bongartz


MIDGGGYC
hemagglutinin
fusion properties
et al.,


(SEQ ID NO: 9)
HA-2

1994


 


YGRKKRRQRRR
TAT of HIV
Endowed with membrane
Green and


(SEQ ID NO: 5)

fusion properties
Loewensiein,





1988


 


23-residue 
HIV-1 trans-
Was able to insert as an
Curtain


fusogenic N- 
membrane
alpha-helix into neutral
et al.,


terminal peptide
glycoprotein 
phospholipid bilayers
1999



gp41




 


70 residue 
Fusion peptide
Induced lipid mixing of
Ghosh and


peptide
and N-terminal
egg phosphatidylcholine-
Shai, 1999


(SV-117)
heptad repeat 
phosphatidyiglycerol




of Sendai virus
(PC/PG) large unilamellar





vesicles (LUVs)



 


23 hydrophobic 
5 protein of
A high degree of similarity
Rodriguez-


amino acids in 
hepatitis B 
with known fusogenic
Crespo


the amino-
virus (HBV)
peptides from other 
et al,


terminal region

viruses.
1994


 


MSGTFGGILAGLIGLL
N-terminal 
Was inserted into the
Rodriguez-


(SEQ ID NO: 6)
region of   
hydrophobic core of the
Crespo



the S protein  
lipid bilayer and induced
et al,



of duck 
leakage of internal aqueous
1999



hepatitis
contents from both neutral




B Virus 
and negatively charged




(DHBV)
liposomes



 


MSPSSLLGLLAGLQVV
S protein of
Was inserted into the
Rodriguez-


(SEQ ID NO: 14)
woodchuck
hydrophobic core of the
Crespo



hepatitis 
lipid bilayer and induced
et al.,



B virus
leakage of internal aqueous
1999



(WHV)
contents from both neutral





and negatively charged





liposomes



 


N-terminus of 
Nef protein of
Membrane-perturbing and
Macreadie


Nef
human immuno-
fusogenic activities in
et al.,



deficiency
artificial membranes; 
1997



type 1 (HIV-1)
causes cell killing in 





E. coli and yeast



 


Amino-terminal 
F1 polypeptide 
Can be used as a carrier
Partidos


sequence F1
of measles 
system for CTL epitopes
et al.,


polypeptide
virus (MV)

1996


 


19-27 amino  
Glycoprotein
Adopts an amphiphilic
Voneche  


acid segment
gp51 of bovine
structure and plays a key
et al.,



leukemia virus
role in the fusion events
1992




induced by bovine leukemia





virus



 


120 to 133 and 
Prion protein
Tilted lipid-associating
Pillot  


118 to 135

peptide; interact with
et al,


domains

liposomes to induce leakage
1997b




of encapsulated calcein



 


29-42-residue 
Alzheimer's 
Endowed with capacities
Lins  


fragment
beta-amyloid 
resembling those of the
et al.,



peptide
tilted fragment of viral
1999




fusion proteins



 


Non-aggregated 
Alzheimer's 
Induces apoptotic neuronal
Pillot


amyloid
beta-amyloid 
cell death
et al.,


beta-peptide
peptide

1999


(1-40)





 


LCAT 56-68 
Lecithin
Forms stable beta-sheets in
Peelman


helical
cholesterol
lipids
et al.,


segment
acyltransferase

1999;



(LCAT)

Decout





et al.,





1999


 


Peptide 
Membrane-
Triggers fusion between
Ulrich


sequence B18
associated sea
lipid vesicles; a histidine-
et al.,



urchin sperm
rich motif for binding zinc
1999



protein binding
is required for the 





fusogenic function



 


53-70 
Apolipoprotein
Induces fusion of
Lambert


(C-terminal 
(apo) AII
unilamellar lipid vesicles
et al.,


helix)

and displaces apo AI from
1998




HDL and r-HDL



 


Residues 90-111
PH-30 alpha (a
Membrane-fusogenic
Niidome



protein
activity to acidic
et al.,



functioning in
phospholipid bilayers
1997



sperm-egg 





fusion)




 


Casein signal 
Alpha s2- and
Interact with
Creuzenet


peptides
beta-casein
dimyristoylphosphatidyl-
et al.,




glycerol and -choline
1997




liposomes; show both lytic





and fusogenic activities



 


Pardaxin
Amphipathic
Forms voltage-gated,
Lelkes and



polypeptide,
cation-selective pores;
Lazarovici,



purified from 
mediated the aggregation of
1988



the gland 
liposomes composed of




secretion of 
phosphatidylserine but not




the Red Sea 
of phosphatidylcholine




Moses sole





flatfish





Pardachirus





marmoratus




 


Histatin-5
Salivary
Aggregates and fuses
Melino



antimicrobial
negatively charged small
et al.,



peptide
unilamellar vesicles in the
1999




presence of Zn2/



Gramicidin 
Antibiotic
Induces aggregation and
Massari and


(linear 

fusion of vesicles
Colonna,


hydrophobic


1986;  


polypeptide)


Tournois





et al.,





1990


Amphipathic 
Synthetic
Forms an alpha-helix
Martin


negatively

inserted and anchored into
et al.,


charged peptide 

the membrane (favored at
1999


consisting of 11

37° C.) oriented almost



residues (WAE)

parallel to the lipid acyl





chains; promotes fusion of





large unilamellar liposomes





(LUV)



 


A polymer of
Synthetic
Histidyl residues become
Midoux and


polylysine

cationic upon protonation 
Monsigny, 


(average 190)

of the imidazole groups at
1999


partially 

pH below 6.0.; disrupt



substituted with

endosomal membranes



histidyl residues





 


GLFEALLELLESLWELL
Synthetic
Amphipathic peptide; a pH-
Duguid


LEA 

sensitive lytic agent to
et al.,


(SEQ ID NO: 4)

facilitate release of the
1998




plasmid from endosomes



 


(LKKL)4 
Synthetic
Amphiphilic fusogenic
Gupta and


(SEQ ID NO: 15)

peptide, able to interact 
Kothekar,




with four molecules of DMPC
1997


 


Ac-(Leu-Ala-
Synthetic; 
Caused a leakage of
Suenaga


Arg-Leu)3-NHCH3 
basic
contents from small
et al.,


(SEQ ID NO: 16)
amphipathic
unilamellar vesicles
1989;



peptides
composed of egg yolk
Lee et al.,




phosphatidylcholine and egg
1992




yolk phosphatidic acid (3:1)



 


Amphiphilic 
Synthetic
Can mimic the fusogenic
Murata  


anionic

activity of influenza
et al.,


peptides

hemagglutinin (HA)
1991


E5 and E5L





30-amino acid 
Synthetic; de-
Becomes an amphipathic
Parente


peptide with
signed to mimic
alpha-helix as the pH is
et al.,


the major
the behavior of
lowered to 5.0 ; fusion of
1988


repeat unit 
the fusogenic
phosphatidylcholine small



Glu-Ala-Leu-
sequences of
unilamellar vesicles 



Ala (GALA)7
viral fusion
induced by GALA requires a 



(SEQ ID NO: 17)
proteins
peptide length greater  





than 16 amino acids



 


Poly Glu-Aib-
Synthetic
Amphiphilic structure upon
Kono


Leu-Aib

the formation of alpha-
et al.,


(SEQ ID NO: 18)

helix; caused fusion of
1993


Aib represents 2-

EYPC liposomes and



aminoisobutyric

dipalmitoylphosphatidyl-



acid

choline liposomes more





strongly with decreasing pH









Fusogenic Lipids
DOPE is a fusogenic lipid; elastase cleavage of N-methoxy-succinyl-Ala-Ala-Pro-Val-DOPE (SEQ ID NO:19) converted this derivative to DOPE (overall positive charge) to deliver an encapsulated fluorescent probe, calcein, into the cell cytoplasm (Pak et al., 1999). An oligodeoxynucleic sequence of 30 bases complementary to a region of beta-endorphin mRNA elicited a concentration-dependent inhibition of beta-endorphin production in cell culture after it was encapsulated within small unilamellar vesicles (50 nm) containing dipalmitoyl-DL-alpha-phosphatidyl-L-serine endowed with fusogenic properties (Fresta et al., 1998).
Nuclear Localization Signals (NLS)
In a further embodiment, the liposome encapsulated plasmid or oligonucleotide DNA described herein further comprise an effective amount of nuclear localization signal (NLS) peptides. Trafficking of nuclear proteins from the site of their synthesis in the cytoplasm to the sites of function in the nucleus through pore complexes is mediated by NLSs on proteins to be imported into nuclei (Tables 3-10, below). Protein translocation from the cytoplasm to the nucleoplasm involves: (i) the formation of a complex of karyopherin α with NLS-protein; (ii) subsequent binding of karyopherin β; (iii) binding of the complex to FXFG peptide repeats on nucleoporins; (iv) docking of Ran-GDP to nucleoporin and to karyopherin heterodimer by p10; (v) a number of association-dissociation reactions on nucleoporins that dock the import substrate toward the nucleoplasmic side with a concomitant GDP-GTP exchange reaction transforming Ran-GDP into Ran-GTP and catalyzed by karyopherin α; and (vi) dissociation from karyopherin and release of the karyopherin α/NLS-protein by Ran-GTP to the nucleoplasm.
Karyophilic and acidic clusters were found in most non-membrane serine/threonine protein kinases whose primary structure has been examined (Table 6). These karyophilic clusters might mediate the anchoring of the kinase molecules to transporter proteins for their regulated nuclear import and might constitute the nuclear localization signals. In contrast to protein transcription factors that are exclusively nuclear possessing strong karyophilic peptides composed of at least four arginines, (R), and lysines, (K), within an hexapeptide flanked by proline and glycine helix-breakers, protein kinases often contain one histidine and three K+R residues (Boulikas, 1996). This was proposed to specify a weak NLS structure resulting in the nuclear import of a fraction of the total cytoplasmic kinase molecules, as well as in their weak retention in the different ionic strength nuclear environment. Putative NLS peptides in protein kinases may also contain hydrophobic or bulky aromatic amino acids proposed to further diminish their capacity to act as strong NLS.
Most mammalian proteins that participate in DNA repair pathways seem to possess strong karyophilic clusters containing at least four R+K over a stretch of six amino acids (Table 7).
Rules to Predict Nuclear Localization of an Unknown Protein
Several simple rules have been proposed for the prediction of the nuclear localization of a protein of an unknown function from its amino acid sequence:
(i) An NLS is defined as four arginines (R) plus lysines (K) within an hexapeptide; the presence of one or more histidines (H) in the tetrad of the karyophilic hexapeptide, often found in protein kinases that have a cytoplasmic and a nuclear function, may specify a weak NLS whose function might be regulated by phosphorylation or may specify proteins that function in both the cytoplasm and the nucleus (Boulikas, 1996);
(ii) The K/R clusters are flanked by the α-helix breakers G and P thus placing the NLS at a helix-turn-helix or end of a α-helix. Negatively-charged amino acids (D, E) are often found at the flank of the NLS and on some occasions may interrupt the positively-charged NLS cluster;
(iii) Bulky amino acids (W, F, Y) are not present within the NLS hexapeptide;
(iv) NLS signals may not be flanked by long stretches of hydrophobic amino acids (e.g. five); a mixture of charged and hydrophobic amino acids serves as a mitochondrial targeting signal;
(v) The higher the number of NLSs, the more readily a molecule is imported to the nucleus (Dworetzky et al., 1988). Even small proteins, for example histones (10-22 kDa), need to be actively imported to increase their import rates compared with the slow rate of diffusion of small molecules through pores;
(vi) Signal peptides are stronger determinants than NLSs for protein trafficking. Signal peptides direct proteins to the lumen of the endoplasmic reticulum for their secretion or insertion into cellular membranes (presence of transmembrane domains) (Boulikas, 1994);
(vii) Signals for the mitochondrial import of proteins (a mixture of hydrophobic and karyophilic amino acids) may antagonize nuclear import signals and proteins possessing both type of signals may be translocated to both mitochondria and nuclei;
(viii) Strong association of a protein with large cytoplasmic structures (membrane proteins, intermediate filaments) make such proteins unavailable for import even though they posses NLS-like peptides (Boulikas, 1994);
(ix). Transcription factors and other nuclear proteins posses a great different number of putative NLS stretches. Of the sixteen possible forms of putative NLS structures the most abundant types are the θθxθθ, θθθxθ, θθθθ, and θθxθxθ, where θ is R or K, together accounting for about 70% of all karyophilic clusters on transcription factors (Boulikas, 1994);
(x) A small number of nuclear proteins seem to be void of a typical karyophilic NLS. Either non karyophilic peptides function for their nuclear import, as such molecules possess bipartite NLSs, or these NLS-less proteins depend absolutely for import on their strong complexation in the cytoplasm with a nuclear protein partner able to be imported (Boulikas, 1994). This mechanism may ensure a certain stoichiometric ratio of the two molecules in the nucleus, and might be of physiological significance; and
(xi) A number of proteins may be imported via other mechanisms not dependent on classical NLS.
A number of processes have been found to be regulated by nuclear import including nuclear translocation of the transcription factors NF-κB, rNFIL-6, ISGF3, SRF, c-Fos, GR as well as human cyclins A and B1, casein kinase II, cAMP-dependent protein kinase II, protein kinase C, ERK1 and ERK2. Failure of cells to import specific proteins into nuclei can lead to carcinogenesis. For example, BRCA1 is mainly localized in the cytoplasm in breast and ovarian cancer cells, whereas in normal cells the protein is nuclear. mRNA is exported through the same route as a complex with nuclear proteins possessing nuclear export signals (NES). The majority of proteins with NES are RNA-binding proteins that bind to and escort RNAs to the cytoplasm. However, other proteins with NES function in the export of proteins; CRM1, that binds to the NES sequence on other proteins and interacts with the nuclear pore complex, is an essential mediator of the NES-dependent nuclear export of proteins in eukaryotic cells. Nuclear localization and export signals (NLS and NES) are found on a number of important molecules, including p53, v-Rel, the transcription factor NF-ATc, the c-Abl nonreceptor tyrosine kinase, and the fragile X syndrome mental retardation gene product. The deregulation of their normal import/export trafficking has important implications for human disease. Both nuclear import and export processes can be manipulated by conjugation of proteins with NLS or NES peptides. During gene therapy, the foreign DNA needs to enter nuclei for its transcription. A pathway is proposed involving the complexation of plasmids and oligonucleotides with nascent nuclear proteins possessing NLSs as a prerequisite for their nuclear import. Covalent linkage of NLS peptides to oligonucleotides and plasmids or formation of complexes of plasmids with proteins possessing multiple NLS peptides was proposed (Boulikas, 1998b) to increase their import rates and the efficiency of gene expression. Cancer cells were predicted to import more efficiently foreign DNA into nuclei, compared with terminally differentiated cells because of their increased rates of proliferation and protein import.
Antineoplastic Drugs
In a further embodiment, the liposome encapsulated plasmid or oligonucleotide DNA described herein, further comprises its use for reducing tumor size or restricting its growth with combination with encapsulated or free antineoplastic agents. Antineoplastic agents preferably are: (i) alkylating agents having the bis-(2-chloroethyl)-amine group such as chlormethine, chlorambucile, melphalan, uramustine, mannomustine, extramustinephosphat, mechlorethaminoxide, cyclophosphamide, ifosfamide, or trifosfamide; (ii) alkylating agents having a substituted aziridine group, for example tretamine, thiotepa, triaziquone, or mitomycine; (iii) alkylating agents of the methanesulfonic ester type such as busulfane; (iv) alkylating N-alkyl-N-nitrosourea derivatives, for example carmustine, lomustine, semustine, or streptozotocine; (v) alkylating agents of the mitobronitole, dacarbazine, or procarbazine type; (vi) complexing agents such as cis-platin; (vii) antimetabolites of the folic acid type, for example methotrexate; (viii) purine derivatives such as mercaptopurine, thioguanine, azathioprine, tiamiprine, vidarabine, or puromycine and purine nucleoside phosphorylase inhibitors; (ix) pyrimidine derivatives, for example fluorouracil, floxuridine, tegafur, cytarabine, idoxuridine, flucytosine; (x) antibiotics such as dactinomycin, daunorubicin, doxorubicin, mithramycin, bleomycin or etoposide; (xi) vinca alkaloids; (xii) inhibitors of proteins overexpressed in cancer cells such as telomerase inhibitors, glutathione inhibitors, proteasome inhibitors; (xiii) modulators or inhibitors of signal transduction pathways such as phosphatase inhibitors, protein kinase C inhibitors, casein kinase inhibitors, insulin-like growth factor-1 receptor inhibitor, ras inhibitors, ras-GAP inhibitor, protein tyrosine phosphatase inhibitors; (xiv) tumor angiogenesis inhibitors such as angiostatin, oncostatin, endostatin, thalidomide; (xv) modulators of the immune response and cytokines such as interferons, interleukins, TNF-alpha; (xvi) modulators of the extracellular matrix such as matrix metalloproteinase inhibitors, stromelysin inhibitors, plasminogen activator inhibitor; (xvii) hormone modulators for hormone-dependent cancers (breast cancer, prostate cancer) such as antiandrogen, estrogens; (xviii) apoptosis regulators; (xix) bFGF inhibitor; (xx) multiple drug resistance gene inhibitor; (xxi) monoclonal antibodies or antibody fragments against antigenes overexpressed in cancer cells (anti-Her2/neu for breast cancer); (xxii) anticancer genes whose expression will cause apoptosis, arrest the cell cycle, induce an immune response against cancer cells, inhibit tumor angiogenesis i.e. formation of blood vessels, tumor suppressor genes (p53, RB, BRCA1, E1A, bcl-2, MDR-1, p21, p16, bax, bcl-xs, E2F, IGF-I VEGF, angiostatin, oncostatin, endostatin, GM-CSF, IL-12, IL-2, IL-4, IL-7, IFN-γ, and TNF-α); and (xxiii) antisense oligonucleotides (antisense c-fos, c-myc, K-ras). Optionally these drugs are administered in combination with chlormethamine, prednisolone, prednisone, or procarbazine or combined with radiation therapy. Future new anticancer drugs added to the arsenal are expected to be ribozymes, triplex-forming oligonucleotides, gene inactivating oligonucleotides, a number of new genes directed against genes that control the cell proliferation or signaling pathways, and compounds that block signal transduction.
Anti-cancer drugs include: acivicin, aclarubicin, acodazole hydrochloride, acronine, adozelesin, adriamycin, aldesleukin, altretamine, ambomycin, ametantrone acetate, aminoglutethimide, amsacrine, anastrozole, anthramycin, asparaginase, asperlin, azacitidine, azetepa, azotomycin, batimastat, benzodepa, bicalutamide, bisantrene hydrochloride, bisnafide dimesylate, bizelesin, bleomycin sulfate, brequinar sodium, bropirimine, busulfan, cactinomycin, calusterone, caracemide, carbetimer, carboplatin, carmustine, carubicin hydrochloride, carzelesin, cedefingol, chlorambucil, cirolemycin, cisplatin, cladribine, crisnatol mesylate, cyclophosphamide, cytarabine, dacarbazine, dactinomycin, daunorubicin hydrochloride, decitabine, dexormaplatin, dezaguanine, dezaguanine mesylate, diaziquone, docetaxel, doxorubicin, doxorubicin hydrochloride, droloxifene, droloxifene citrate, dromostanolone propionate, duazomycin, edatrexate, eflornithine hydrochloride, elsamitrucin, enloplatin, enpromate, epipropidine, epirubicin hydrochloride, erbulozole, esorubicin hydrochloride, estramustine, estramustine phosphate sodium, etanidazole, etoposide, etoposide phosphate, etoprine, fadrozole hydrochloride, fazarabine, fenretinide, floxuridine, fludarabine phosphate, fluorouracil, flurocitabine, fosquidone, fostriecin sodium, gemcitabine, gemcitabine hydrochloride, hydroxyurea, idarubicin hydrochloride, ifosfamide, ilmofosine, interferon alfa-2a, interferon α-2b, interferon α-n1, interferon α-n3, interferon β-i a, interferon γ-i b, iproplatin, irinotecan hydrochloride, lanreotide acetate, letrozole, leuprolide acetate, liarozole hydrochloride, lometrexol sodium, lomustine, losoxantrone hydrochloride, masoprocol, maytansine, mechlorethamine hydrochloride, megestrol acetate, melengestrol acetate, melphalan, menogaril, mercaptopurine, methotrexate, methotrexate sodium, metoprine, meturedepa, mitindomide, mitocarcin, mitocromin, mitogillin, mitomalcin, mitomycin, mitosper, mitotane, mitoxantrone hydrochloride, mycophenolic acid, nocodazole, nogalamycin, ormaplatin, oxisuran, paclitaxel, pegaspargase, peliomycin, pentamustine, peplomycin sulfate, perfosfamide, pipobroman, piposulfan, piroxantrone hydrochloride, plicamycin, plomestane, porfimer sodium, porfiromycin, prednimustine, prednisone, procarbazine hydrochloride, puromycin, puromycin hydrochloride, pyrazofurin, riboprine, rogletimide, safingol, safingol hydrochloride, semustine, simtrazene, sparfosate sodium, sparsomycin, spirogermanium hydrochloride, spiromustine, spiroplatin, streptonigrin, streptozocin, sulofenur, talisomycin, taxol, tecogalan sodium, tegafur, teloxantrone hydrochloride, temoporfin, teniposide, teroxirone, testolactone, thiamiprine, thioguanine, thiotepa, tiazofurin, tirapazamine, topotecan hydrochloride, toremifene citrate, trestolone acetate, triciribine phosphate, trimetrexate, trimetrexate glucuronate, triptorelin, tubulozole hydrochloride, uracil mustard, uredepa, vaprcotide, verteporfin, vinblastine sulfate, vincristine sulfate, vindesine, vindesine sulfate, vinepidine sulfate, vinglycinate sulfate, vinleurosine sulfate, vinorelbine tartrate, vinzolidine sulfate, vinzolidine sulfate, vorozole, zeniplatin, zinostatin, zorubicin hydrochloride.
Other anti-cancer drugs include: 20-epi-1,25 dihydroxyvitamin D3, 5-ethynyluracil, abiraterone, aclarubicin, acylfulvene, adecypenol, adozelesin, aldesleukin, ALL-TK antagonists, altretamine, ambamustine, amidox, amifostine, aminolevulinic acid, amrubicin, amsacrine, anagrelide, anastrozole, andrographolide, angiogenesis inhibitors, antagonist D, antagonist G, antarelix, anti-dorsalizing morphogenetic protein-1, anti androgen, antiestrogen, antineoplaston, antisense oligonucleotides, aphidicolin glycinate, apoptosis gene modulators, apoptosis regulators, apurinic acid, ara-CDP-DL-PTBA, arginine deaminase, asulacrine, atamestane, atrimustine, axinastatin 1, axinastatin 2, axinastatin 3, azasetron, azatoxin, azatyrosine, baccatin III derivatives, balanol, batimastat, BCR/ABL antagonists, benzochlorins, benzoylstaurosporine, beta lactam derivatives, beta-alethine, betaclamycin B, betulinic acid, bFGF inhibitor, bicalutamide, bisantrene, bisaziridinylspermine, bisnafide, bistratene A, bizelesin, breflate, bropirimine, budotitane, buthionine sulfoximine, calcipotriol, calphostin C, camptothecin derivatives, canarypox IL-2, capecitabine, carboxamide-amino-triazole, carboxyamidotriazole, CaRest M3, CARN 700, cartilage derived inhibitor, carzelesin, casein kinase inhibitors (ICOS), castanospermine, cecropin B, cetrorelix, chlorins, chloroquinoxaline sulfonamide, cicaprost, cis-porphyrin, cladribine, clomifene analogues, clotrimazole, collismycin A, collismycin B, combretastatin A4, combretastatin analogue, conagenin, crambescidin 816, crisnatol, cryptophycin 8, cryptophycin A derivatives, curacin A, cyclopentanthraquinones, cycloplatam, cypemycin, cytarabine ocfosfate, cytolytic factor, cytostatin, dacliximab, decitabine, dehydrodidemnin B, deslorelin, dexifosfamide, dexrazoxane, dexverapamil, diaziquone, didemnin B, didox, diethylnorspermine, dihydro-5-azacytidine, dihydrotaxol, 9-dioxamycin, diphenyl spiromustine, docosanol, dolasetron, doxifluridine, droloxifene, dronabinol, duocarmycin SA, ebselen, ecomustine, edelfosine, edrecolomab, eflornithine, elemene, emitefur, epirubicin, epristeride, estramustine analogue, estrogen agonists, estrogen antagonists, etanidazole, etoposide phosphate, exemestane, fadrozole, fazarabine, fenretinide, filgrastim, finasteride, flavopiridol, flezelastine, fluasterone, fludarabine, fluorodaunorunicin hydrochloride, forfenimex, formestane, fostriecin, fotemustine, gadolinium gallium nitrate texaphyrin, galocitabine, ganirelix, gelatinase inhibitors, gemcitabine, glutathione inhibitors, hepsulfam, heregulin, hexamethylene bisacetamide, hypericin, ibandronic acid, idarubicin, idoxifene, idramantone, ilmofosine, ilomastat, imidazoacridones, imiquimod, immunostimulant peptides, insulin-like growth factor-1 receptor inhibitor, interferon agonists, interferons, interleukins, iobenguane, iododoxorubicin, ipomeanol, 4-, irinotecan, iroplact, irsogladine, isobengazole, isohomohalicondrin B, itasetron, jasplakinolide, kahalalide F, lamellarin-N triacetate, lanreotide, leinamycin, lenograstim, lentinan sulfate, leptolstatin, letrozole, leukemia inhibiting factor, leukocyte alpha interferon, leuprolide+estrogen+progesterone, leuprorelin, levamisole, liarozole, linear polyamine analogue, lipophilic disaccharide peptide, lipophilic platinum compounds, lissoclinamide 7, lobaplatin, lombricine, lometrexol, lonidamine, losoxantrone, lovastatin, loxoribine, lurtotecan, lutetium texaphyrin, lysofylline, lytic peptides, maitansine, mannostatin A, marimastat, masoprocol, maspin, matrilysin inhibitors, matrix metalloproteinase inhibitors, menogaril, merbarone, meterelin, methioninase, metoclopramide, MIF inhibitor, mifepristone, miltefosine, mirimostim, mismatched double stranded RNA, mitoguazone, mitolactol, mitomycin analogues, mitonafide, mitotoxin fibroblast growth factor-saporin, mitoxantrone, mofarotene, molgramostim, monoclonal antibody, human chorionic gonadotrophin, monophosphoryl lipid A+myobacterium cell wall sk, mopidamol, multiple drug resistance gene inhibitor, multiple tumor suppressor 1-based therapy, mustard anticancer agent, mycaperoxide B, mycobacterial cell wall extract, myriaporone, N-acetyldinaline, N-substituted benzamides, nafarelin, nagrestip, naloxone+pentazocine, napavin, naphterpin, nartograstim, nedaplatin, nemorubicin, neridronic acid, neutral endopeptidase, nilutamide, nisamycin, nitric oxide modulators, nitroxide antioxidant, nitrullyn, O6-benzylguanine, octreotide, okicenone, oligonucleotides, onapristone, ondansetron, ondansetron, oracin, oral cytokine inducer, ormaplatin, osaterone, oxaliplatin, oxaunomycin, paclitaxel analogues, paclitaxel derivatives, palauamine, palmitoylrhizoxin, pamidronic acid, panaxytriol, panomifene, parabactin, pazelliptine, pegaspargase, peldesine, pentosan polysulfate sodium, pentostatin, pentrozole, perflubron, perfosfamide, perillyl alcohol, phenazinomycin, phenylacetate, phosphatase inhibitors, picibanil, pilocarpine hydrochloride, pirarubicin, piritrexim, placetin A, placetin B, plasminogen activator inhibitor, platinum complex, platinum compounds, platinum-triamine complex, porfimer sodium, porfiromycin, propyl bis-acridone, prostaglandin J2, proteasome inhibitors, protein A-based immune modulator, protein kinase C inhibitor, protein kinase C inhibitors, microalgal, protein tyrosine phosphatase inhibitors, purine nucleoside phosphorylase inhibitors, purpurins, pyrazoloacridine, pyridoxylated hemoglobin polyoxyethylene conjugate, raf antagonists, raltitrexed, ramosetron, ras farnesyl protein transferase inhibitors, ras inhibitors, ras-GAP inhibitor, retelliptine demethylated, rhenium Re 186 etidronate, rhizoxin, ribozymes, RII retinamide, rogletimide, rohitukinc, romurtide, roquinimex, rubiginone B1, ruboxyl, safingol, saintopin, SarCNU, sarcophytol A, sargramostim, Sdi 1 mimetics, semustine, senescence derived inhibitor 1, sense oligonucleotides, signal transduction inhibitors, signal transduction modulators, single chain antigen binding protein, sizofiran, sobuzoxane, sodium borocaptate, sodium phenylacetate, solverol, somatomedin binding protein, sonermin, sparfosic acid, spicamycin D, spiromustine, splenopentin, spongistatin 1, squalamine, stem cell inhibitor, stem-cell division inhibitors, stipiamide, stromelysin inhibitors, sulfinosine, superactive vasoactive intestinal peptide antagonist, suradista, suramin, swainsonine, synthetic glycosaminoglycans, tallimustine, tamoxifen methiodide, tauromustine, tazarotene, tecogalan sodium, tegafur, tellurapyrylium, telomerase inhibitors, temoporfin, temozolomide, teniposide, tetrachlorodecaoxide, tetrazomine, thaliblastine, thalidomide, thiocoraline, thrombopoietin, thrombopoietin mimetic, thymalfasin, thymopoietin receptor agonist, thymotrinan, thyroid stimulating hormone, tin ethyl etiopurpurin, tirapazamine, titanocene dichloride, topotecan, topsentin, toremifene, totipotent stem cell factor, translation inhibitors, tretinoin, triacetyluridine, triciribine, trimetrexate, triptorelin, tropisetron, turosteride, tyrosine kinase inhibitors, tyrphostins, UBC inhibitors, ubenimex, urogenital sinus-derived growth inhibitory factor, urokinase receptor antagonists, vapreotide, variolin B, velaresol, veramine, verdins, verteporfin, vinorelbine, vinxaltine, vitaxin, vorozole, zanoterone, zeniplatin, zilascorb, zinostatin stimalamer.
pH-Sensitive Peptide-DNA Complexes
In a further embodiment of the invention, the genes in plasmid DNA are brought in interaction with fusogenic peptide/NLS conjugates. In a further embodiment the NLS moiety is a stretch of histidyl residues able to assume a net positive charge at a pH of about 5 to 6 and to show a reduction or loose completely this charge at pH above 7. The electrostatic interaction of these positively-charged peptides with the negatively-charged plasmid DNA molecules, established at pH 5-6 is weakened at physiological pH (pH-sensitive peptide-DNA complexes).
The first step of the present invention involves complex formation between the plasmid or oligonucleotide DNA with the histidyl/fusogenic peptide conjugate and lipid components in 10-90% ethanol at pH 5.0 to 6.0. The conditions must be where the histidyl residues have a net positive charge and can establish electrostatic interactions with plasmids, oligonucleotides or negatively-charged drugs. At the same time, the presence of the positively-charged lipid molecules promotes formation of micelles. At the second step, micelles are converted into liposomes by dilution with water and mixing with pre-made liposomes or lipids at pH 5-6. This is followed by dialysis against pH 7 and extrusion through membranes, entrapping and encapsulating plasmids or oligonucleotides to with a very high yield.
Whereas the composition of peptides and cationic lipids in the first step provides the lipids of the internal bilayer, the type of liposomes or lipids added at step 2 provide the external coating of the final liposome formulation (FIG. 1). Examples for the formulations of peptides include: HHHHHSPSL16 (SEQ ID NO:623), and HHHHHSPS(LAI)5 (SEQ ID NO:624).
These are added at a 1:0.5:0.5 molar ratio (negative charge on DNA:cationic liposome: histidine peptide). The peptide inserts in an alpha-helical conformation inside the lipid bilayer and not only carries out DNA condensation but also endows membrane fusion properties to the complex to improve entrance across the cell membrane. The type of hydrophobic amino acids (for example, content in aromatic amino acids), in the peptide chain is very important as is the length of the peptide chain in ensuring integrity and rigidity of the complexes. Coating the outer surface of the complexes with polyethyleneglycol, hyaluronic acids and other polymers conjugated to lipids gives the particles long circulation properties in body fluids and the ability to target solid tumors and their metastases after intravenous injection, and also the ability to cross the tumor cell membrane.
Protease-Sensitive Linkages in Peptides Between the NLS and Fusogenic Moieties
Conversion of Micelles into Liposomes
An important issue of the present invention is the conversion of micelles formed between the DNA and the cationic lipids, in the presence of ethanol, into liposomes. This is done by the direct addition of the micelle complex into an aqueous solution of preformed liposomes. The liposomes have an average size of 80-160 nm or vice versa, leading to a solution of a final ethanol concentration below 10%. A formulation suitable for pharmaceutical use and for injection into humans and animals will require that the liposomes are of neutral composition (such as cholesterol, PE, PC) coated with PEG.
However, another important aspect is the research application of the present invention, such as for transfection of cells in culture. The composition of the aqueous solution of liposomes is any type of liposomes containing cationic lipids and suitable therefore for transfection of cells in culture such as DDAB:DOPE 1:1. These liposomes are pre-formed and downsized by sonication or extrusion through membranes to a diameter of 80-160 nm. The ethanolic micelle preparations are then added to the aqueous solution of liposomes with a concomitant dilution of the ethanol solution to below 10%. This step will result in further condensation of DNA or interaction of the negatively-charged phosphate groups on DNA with positively charged groups on lipids. Care must be taken so as only part of the negative charges on DNA are neutralized by lipids in the micelle. The remaining charge neutralization of the DNA is to be provided by the cationic component of the preformed liposomes in the second step.
Regulatory DNA and Nuclear Matrix-Attached DNA
In a further embodiment of the present invention, the genes in plasmid DNA are driven by regulatory DNA sequences isolated from nuclear matrix-attached DNA using shotgun selection approaches.
The compact structural organization of chromatin and the proper spatial orientation of individual chromosomes within a cell are partially provided by the nuclear matrix. The nuclear matrix is composed of DNA, RNA and proteins and serves as the site of DNA replication, gene transcription, DNA repair, and chromosomal attachment in the nucleus. Diverse sets of DNA sequences have been found associated with nuclear matrices and is referred to as matrix attachment regions or MARs. The MARs serve many functions, acting as activators of gene transcription, silencers of gene expression, insulators of transcriptional activity, nuclear retention signals and origins of DNA replication. Current studies indicate that different subsets of MARs are found in different tissue types and may assist in regulating the specific functions of cells. The presence of this complex assortment of structural and regulatory molecules in the matrix, as well as the in situ localization of DNA replication and transcription complexes to the matrix strongly suggest that the nuclear matrix plays a fundamental, unique role in nuclear processes. The structuring of genomes into domains has a functional significance. The inclusion of specific MAR elements within gene transfer vectors could have utility in many experimental and gene therapy applications. Many gene therapy applications require specific expression of one or more genes in targeted cell types for prolonged time periods. MARs within vectors could enhance transcription of the introduced transgene, prolong the retention of that sequence within the nucleus or insulate expression of that transgene from the expression of a cotransduced gene (reviewed by Boulikas, 1995; Bode et al, 1996).
Various biochemical procedures have been used to identify regulatory regions within genes. Traditionally, identification and selection of regulatory DNA sequences depend on tedious procedures such as transcription factor footprinting in vitro or in vivo, or subcloning of smaller fragments from larger genomic DNA sequences upstream of reporter genes. These methods have been used primarily to identify regions proximal to the 5′ end of genes. However, in many instances, regulatory regions are found at considerable distances from the proximal 5′ end of the gene, and confer cell type- or developmental stage-specificity. For example, studies from the groups of Grosveld and Engel (Lakshmanan et al., 1999) have shown that over 625 kb of genomic sequences surrounding the GATA-3 locus are required for the correct developmental expression of the gene in transgenic mice. Extensive DNA stretches at distances 5-20 kb upstream of the gene were found to be responsible for the central nervous system-specificity of expression. The region between 20 to 130 kb upstream of the gene harbored regulatory regions for urogenital-specific expression of GATA-3, whereas sequences 90-180 kb downstream of the gene conferred endocardial-specific expression.
The presently disclosed method has the potential of rapidly identifying regulatory control regions. In cells, chromatin loops are formed and different attachment regions are used in different cell types or stages of development to modulate the expression of a gene. The presently disclosed method for isolating regulatory regions based on their attachment to the nuclear matrix can identify regulatory regions irrespective of their distance from the gene. Although the human genome project is expected to be almost complete by the year 2000, information on the location and nature of the vast majority of the estimated 500,000 regulatory regions will not be available.
Example 1
Plasmid DNA condenses with various agents, as well as various formulations of cationic liposomes. The condensation affects the level of expression of the reporter beta-galactosidase gene after transfection of K562 human erythroleukemia cell cultures. Liposome compositions are shown in the Table below and in FIG. 2. All lipids were from Avanti Polar Lipids (700 Industrial Park Drive, Alabaster, Ala. 35007). The optimal ratio of lipid to DNA was 7 nmoles total lipid/μg DNA. The transfection reagent (10 μg DNA mixed with 70 nmoles total lipid) was transferred to a small culture flask followed by the addition of 10 ml K562 cell culture (about 2 million cells total); mixing of cells with the transfection reagent was at 5-10 min after mixing DNA with liposomes. Cells were assayed for beta-galactosidase activity several times at 1-30 days post-transfection. The transfected cells were maintained in cell culture as normal cell cultures.
Best results were obtained when the cells used for transfection were at low number, not near confluence. In all experiments the transfection material was added directly in the presence of serum and antibiotics without removal of the transfection reagent or washings of the cells. This simplifies the transfection procedure and is suitable for lymphoid and other type of cell cultures that do not attach to the dish, but grow in suspension. All DNA condensing agents were purchased from Sigma. They were suspended at 0.1 mg/ml in water. Plasmid pCMVβ was purchased from Clontech and was purified using the Anaconda kit of Althea Technologies (San Diego, Calif.). PolyK is polylysine, mw 9,400. PolyR is polyarginine. PolyH is polyhistidine.
To 100 μl plasmid solution (10 μg total plasmid DNA) 20 μl or 500 of polyK, polyR, polyH, were added; the volume was adjusted to 250 μl with water followed by addition of about 70 μl liposomes (7 nmoles/μg DNA). After incubation for 10 min to 1 h at 20° C. the transfection mixture was brought in contact with the cell culture. The best DNA condensing reagent was polyhistidine compared with the popular polylysine. The best cationic lipid was DC-cholesterol (DC-CHOL: 3β[N—(N′,N′-dimethylaminoethane)carbamoyl]cholesterol). SFV is Semliki Forest virus expressing beta-galactosidase. The results are shown in FIG. 2.













Liposome
Molecular weight
Composition
Preparation







L2
DDAB mw 631
DDAB 4.2 μmoles/ml
15 mg DDAB +



DOPE mw 744
DOPE 4.2 μmoles/ml
0.88 ml 20 mg/ml





DOPE


L3
DOGS-NTA mw 1015.4
DOGS-NTA 1 μmole/ml
5 mg DOGS




DOPE 1 μmole/ml
0.185 ml DOPE


L4
DC-Chol (mw 537)
DC-Chol 1 μmole/ml
0.106 ml DC-Chol (25 mg/ml) +



DOPE (mw 744)
DOPE 1 μmole/ml
0.185 ml DOPE (20 mg/ml)


L5
DOTAP (mw 698)
DOTAP 1.4 μmole/ml
0.5 ml 10 mg/ml DOTAP +



DOPE (mw 744)
DOPE 1.3 μmole/ml
0.25 ml DOPE (20 mg/ml)


L6
DODAP (mw 648)
DODAP 1.54 μmoles/ml
0.5 ml 10 mg/ml




DOPE 1.3 μmole/ml
DODAP = 5 mg = 7.72 μmoles +





0.25 ml DOPE (20 mg/ml)









Example 2
Targeting Genes to Tumors Using Gene Vehicles (Lipogenes)
As shown in FIG. 3, tumor targeting in SCID (severe combined immunodeficient) mice were implanted subcutaneously, at two sites, with human MCF-7 breast cancer cells. The cells were allowed to develop into large, measurable solid tumors at about 30 days post-inoculation. Mice were injected intraperitoneously with 0.2 mg plasmid pCMVβ DNA (size of the plasmid is  ̃4 kb) per animal carrying the bacterial beta-galactosidase reporter gene. Plasmid DNA (200 μg, 2.0 mg/ml, 0.1 ml) was incubated for 5 min with 200 μl neutral liposomes of the composition 40% cholesterol, 20% dioleoylphosphatidylethanolamine(DOPE), 12% palmitoyloleoylphosphatidylcholine (POPC), 10% hydrogenated soy phosphatidylcholine (HSPC), 10% distearoylphosphatidylethanolamine (DSPE), 5% sphingomyelin (SM), and 3% derivatized vesicle-forming lipid M-PEG-DSPE.
At this stage, weak complexation of plasmid DNA with neutral (zwitterionic) liposomes takes place. This ensures homogeneous distribution of plasmid DNA to liposomes at the subsequent step of addition of cationic liposomes. After complexation of plasmid DNA with zwitterionic liposomes, 50 μl of cationic liposomes (DC-Chol 1 μmole/ml:DOPE 1.4 μmole/ml) were added and incubated at room temperature for 10 min. At this stage, a mixed liposome population is present and, most likely, formation of a type of liposome-DNA complexes containing lipids from the zwitterionic and cationic lipids takes place. The material was injected (0.35 ml total volume) to the intraperitoneal cavity of the animal. At 5 days post-injection the animal was sacrificed, the skin was removed and the carcass was incubated into X-gal staining solution for about 30 min at 37° C. The animal was incubated in fixative in X-gal staining for about 30 min (addition of 100 μl concentrated glutaraldehyde to 30 ml X-gal staining solution) and the incubation in staining solution continued. Photos were taken in a time course during the incubation period revealing the preferred organs where beta-galactosidase expression took place.
Because of the tumor vasculature targeting shown in FIG. 3E, the data imply that transfer of the genes of angiostatin, endostatin, or oncostatin to the tumors (whose gene products restrict vascular growth and inhibit blood supply to the tumor) is expected to be a rational approach for cancer treatment. Also, a combination therapy using anticancer lipogenes with encapsulated drugs into tumor targeting liposomes appears as a rational cancer therapy.
It is to be understood that while the invention has been described in conjunction with the above embodiments, that the foregoing description and the following examples are intended to illustrate and not limit the scope of the invention. Other aspects, advantages and modifications within the scope of the invention will be apparent to those skilled in the art to which the invention pertains.







TABLE 3







Simple NLS








Signal oligopeptide
Protein and features





PKKKRKV 
Wild-type SV40 large T protein


(SEQ ID NO: 20)
A point mutation converting lysine-128 (double underlined) to



threonine results in the retention of large T in the cytoplasm. 



Transfer of this peptide to the N-terminus of β-galactosidase



or pyruvate kinase



at the gene level and microinjection of plasmids into Vero cells



showed nuclear location of chimeric proteins.


 


PKKKRMV 
SV40 large T with a K→M change. Site-directed mutagenesis only


(SEQ ID NO: 21)
slightly impaired nuclear import of large T.


 


PKKKRKVEDP 
Synthetic NLS peptide from SV40 large T antigen crosslinked to BSA


(SEQ ID NO: 22)
or IgG mediated their nuclear localization after microinjection in



Xenopus oocytes. The PKKGSKKA from Xenopus H2B was



ineffective and PKTKRKV was less effective.


 


CGYGPKKKRKVGG 
Synthetic peptide from SV40 large T antigen conjugated to various


(SEQ ID NO: 23)
proteins and microinjected into the cytoplasm of TC-7 cells. 



Specified nuclear localization up to protein sizes of 465 kD



(ferritin). IgM of 970 kD and with an estimated radius of 25-40



nm was retained in the cytoplasm.


 


CYDDEATADSQHSTPPKKK
SV40 large T protein long NLS. The long NLS but not the short NLS,


RKVEDPKDFESELLS
was able to localize the bulky IgM (970 kD) into the nucleus.


(SEQ ID NO: 24)
Mutagenesis at the four possible sites of phosphorylation (double



underlined) impaired nuclear import.


 


CGGPKKKRKVG
SV40 large T protein. This synthetic peptide crosslinked to chicken


(SEQ ID NO: 25)
serum albumin and microinjected into HeLa cells caused nuclear



localization.


 


PKKKIKV 
A mutated (R→I) version of SV40 large T NLS. Effective NLS.


(SEQ ID NO: 26)



 


MKx11CRLKKLKCSKEKPKC
Yeast GAL4 (99 kD). Fusions of the GAL4 gene portion encoding the


AKCLKx5Rx3KTKR 
74 N-terminal amino acid with E. coli β-galactosidase introduced 


(SEQ ID NO: 27)
into yeast cells specify nuclear localization.


74 N-terminal 



amino acid



 


MKx11CRLKKLKCSKEKPKC
Yeast GAL4. Acted as an efficient nuclear localization sequence 


A (SEQ ID NO: 28)
when fused to invertase but not to β-galactosidase introduced by


29 N-terminal 
transformation into yeast cells.


amino acid



 


PKKARED 
Polyoma large T protein. Identified by fusion with pyruvate kinase


(SEQ ID NO: 29) 
cDNA and microinjection of Vero African green monkey cells.


VSRKRPR
Mutually independent NLS. Can exert cooperative effects.


(SEQ ID NO: 30)



 


CGYGVSRKRPRPG
Polyoma virus large T protein. This synthetic peptide crosslinked 


(SEQ ID NO: 31)
to chicken serum albumin and microinjected into HeLa cells caused



nuclear localization.


 


APTKRKGS
SV40 VP1 capsid polypeptide (46 kD). NLS (N terminus) determined


(SEQ ID NO: 32)
by infection of monkey kidney cells with a fusion construct con- 



taining the 5′ terminal portion of SV40 VP1 gene and the complete 



cDNA sequence of poliovirus capsid VP1 replacing the VP1 gene 



of SV40.


 


APKRKSGVSKC (1-11)
Polyoma virus major capsid protein VP1 (11 N-terminal amino 


(SEQ ID NO: 33)
acid). Yeast expression vectors coding for 17 N-terminal amino 



acid of VP1 fused to β-galactosidase gave a protein that was 



transported to the nucleus in yeast cells. Subtractive constructs  



of VP1 lacking A1 to C11 were cytoplasmic. This, FITC-labeled,



synthetic peptide crosslinked to BSA or IgG, caused nuclear 



import after microinjection into 3T6 cells. Replacement of



K3 with T did not.


 


PNKKKRK 
SV40 VP2 capsid protein (39 kD). The 3′ end of the SV40 VP2-VP3


(SEQ ID NO: 34)
genes containing this peptide when fused to poliovirus VP1 


(amino acid
capsid protein at the gene level resulted in nuclear import 


position 317-323)
of the hybrid VP1 in simian cells infected with the hybrid SV40.


 


EEDGPQKKKRRL 
Polyoma virus capsid protein VP2. A construct having truncated VP2


(307-318)
lacking the 307-318 peptide transfected into COS-7 cells showed


(SEQ ID NO: 35)
cytoplasmic retention of VP2. The 307-318 peptide crosslinked to



BSA or IgG specified nuclear import following their microinjection



into NIH 3T6 cells.


 


GKKRSKA 
Yeast histone H2B. This peptide specified nuclear import when fused


(SEQ ID NO: 36)
to β-galactosidase.


 


KRPRP 
Adenovirus E1a. This pentapeptide, when linked to the C-terminus of


(SEQ ID NO: 37)
E. coli galactokinase, was sufficient to direct its nuclear 



accumulation after microinjection in Vero monkey cells.


 


CGGLSSKRPRP 
Adenovirus type 2/5 E1a. This synthetic peptide crosslinked to 


(SEQ ID NO: 38)
chicken bovine albumin and microinjected into HeLa cells caused 



nuclear localization.


 


LVRKKRKTE3SP 
Xenopus N1 (590 amino acid). Abundant in X. laevis oocytes, forming


(NLS1)
complexes with histones H3, H4 via two acidic domains each


(SEQ ID NO: 39)
containing 21 and 9 (D + E), respectively. The NLS1 is required 


LKDKDAKKSKQE 
but not sufficient for nuclear accumulation of protein N1. NLS 


(NLS2)
1 and 2 are contiguous at the C-terminus.


(SEQ ID NO: 40)



 


GNKAKRQRST
v-Rel or p59 v-rel the transforming protein, product of the v-rel


(SEQ ID NO: 41)
oncogene of the avian reticuloendotheliosis retrovirus strain T 



(Rev-T). v-Rel NLS added to the normally cytoplasmic 



β-galactosidase directed that protein to the nucleus.


 


PFLDRLRRDQK
NS1 protein of influenza A virus, that accumulates in nuclei of 


(SEQ ID NO: 42)
virus-infected cells. Determined to be an NLS by deletion 


PKQKRKMAR
mutagenesis of NS1 in recombinant SV40. The 1st NLS is conserved 


(SEQ ID NO: 43)
among all NS1 proteins of influenza A viruses.


 


SVTKKRKLE 
Human lamin A. Dimerization of lamin A was proposed to give a


(SEQ ID NO: 44)
complex with two NLSs that was transported more efficiently.


 


SASKRRRLE
Xenopus lamin A. NLS inferred from its similarity to human lamin A


(SEQ ID NO: 45)
NLS.


 


TKGKRKRID
Xenopus lamin LI . NLS inferred from its sequence similarity to


(SEQ ID NO: 46)
human lamin A NLS.


 


CVRTTKGKRKRIDV
Xenopus lamin LI. This synthetic peptide crosslinked to chicken


(SEQ ID NO: 47)
bovine albumin and microinjected into HeLa cells caused nuclear



localization.


 


ACIDKRVKLD
Human c-myc oncoprotein. This synthetic peptide crosslinked to


(SEQ ID NO: 48)
chicken bovine albumin and microinjected into HeLa cells caused



nuclear localization.


 


ACIDKRVKLD
Human c-myc oncoprotein. Conjugation of the M1 peptide to human


(SEQ ID NO: 49)
serum albumin and microinjection of Vero cells gives complete


(M1, fully 
nuclear accumulation. M2 gave slower and only partial nuclear


potent NLS)
localization.


RQRRNELKRSP



(SEQ ID NO: 50)



(M2, medium 



potency NLS)



 


SALIKKKKKMAP
Murine c-abl (IV) gene product. The p160gag/v-abl has a cytoplasmic


(SEQ ID NO: 51)
and plasma membrane localization, whereas the mouse type IV c-abl



protein is largely nuclear.


 


PPKKRMRRRIE
Adenovirus 5 DBP (DNA-binding protein) found in nuclei of infected


(SEQ ID NO: 52)
cells and involved in virus replication and early and late gene


PKKKKKRP 
expression. Both NLS are needed, and disruption of either site


(SEQ ID NO: 53)
impaired nuclear localization of the 529 amino acid protein.


 


YRKCLQAGMNLEARKTKK
Rat GR, glucocorticoid receptor (795 amino acid) NLS1 determined by


KIKGIQQATA 
fusion with β-galactosidase (116 kD). NLS1 is 100% conserved


(497-524 
between human, mouse and rat GR. Whereas the 407-615 amino acid


amino acid)
fragment of GR specifies nuclear location, the 407-740 amino acid


(SEQ ID NO: 54)
fragment was cytoplasmic in the absence of hormone, indicating that



sequence 615-740 may inhibit the nuclear location activity. A second



(NLS2) is localized in an extensive 256 amino acid C-terminal



domain. NLS 2 requires hormone binding for activity.


 


RKDRRGGRMLKHKRQRDD
Human ER (estrogen receptor, 595 amino acid) NLS. NLS is between


GEGRGEVGSAGDMRAMIN
the hormone-binding and DNA-binding regions; ER, in contrast with


O 
GR, lacks a second NLS. Can direct a fusion product with β-


ACIDNLWPSPLMIKRSKK
galactosidase to the nucleus.


(amino acid 



256-303)



(SEQ ID NO: 55)



 


RKFKKFNK
Rabbit PG (progesterone receptor). 100% homology in humans; F→L


(SEQ ID NO: 56)
change in chickens. When this sequence was deleted, the receptor



became cytoplasmic but could be shifted into the nucleus by addition



of hormone; in this case the hormone mediated the dimerization of a



mutant PG with a wild type PG molecule.


 


GKRKNKPK 
Chicken Ets1 core NLS. Within a 77 amino acid C-terminal segment


(SEQ ID NO: 57)
90% homologous to Ets2. When deleted by deletion mutagenesis at the



gene level the mutant Ets1 became cytoplasmic.


 


PLLKKIKQ 
c-myb gene product; directs puruvate kinase to the nucleus.


(SEQ ID NO: 58)



 


PPQKKIKS 
N-myc gene product; directs puruvate kinase to the nucleus.


(SEQ ID NO: 59)



 


PQPKKKP 
p53; directs puruvate kinase to the nucleus.


(SEQ ID NO: 60)



 


SKRVAKRKL
c-erb-A gene product; directs puruvate kinase to the nucleus.


(SEQ ID NO: 61)



 


CGGLSSKRPRP
Adenovirus type2/5 E1a. This synthetic peptide conjugated with a


(SEQ ID NO: 62)
bifunctional crosslinker to chicken serum albumin (CSA) and



microinjected into HeLa cells directed CSA to the nucleus.


 


MTGSKTRKHRGSGA
Yeast ribosomal protein L29. Double-stranded oligonucleotides


(SEQ ID NO: 63)
encoding the 7 amino acid peptides (underlined) and inserted at 


MTGSKHRKHPGSGA
the N-terminus of the β-galactosidase gene resulted in nuclear 


(SEQ ID NO: 64)
import.


 


RHRKHP 
Mutated peptides derived from yeast L29 ribosomal protein NLS,


(SEQ ID NO: 65)
found to be efficient NLS. The last two are less effective NLS,


KRRKHP 
resulting in both nuclear and cytoplasmic location of 


(SEQ ID NO: 66) 
β-galactosidase fusion protein.


KYRKHP 



(SEQ ID NO: 67)



KHRRHP



(SEQ ID NO: 68)



KHKKHP 



(SEQ ID NO: 69)



RHLKHP 



(SEQ ID NO: 70)



KHRKYP 



(SEQ ID NO: 71)



KHRQHP 



(SEQ ID NO: 72)



 


PETTVVRRRGRSPRRRTPSP
Double NLS of hepatitis B virus core antigen. The two underlined


RRRRSPRRRRSQS 
arginine clusters represent distinct and independent NLS. 


(SEQ ID NO: 73)
Mutagenesis showed that the antigen fails to accumulate in the 


(One sequence, 
nucleus only when both NLS are simultaneously deleted or mutated.


C-terminus)



 


ASKSRKRKL
Viral Jun, a transcription factor of the AP-1 complex. Accumulates 


(SEQ ID NO: 74)
in nuclei most rapidly during G2 and slowly during G1 and S. The 



cell cycle dependence of viral but not of cellular Jun is due to 



a C→S mutation in NLS of viral Jun. This NLS conjugated to rabbit 



IgG can mediate cell cycle-dependent translocation.


 


GGLCSARLHRHALLAT
Human T-cell leukemia virus Tax trans-activator protein. The most


(SEQ ID NO: 75)
basic region within the 48 N-terminal segment. Missense mutations 



in this domain result in its cytoplasmic retention.


 


DTREKKKFLKRRLLRLDE
Mouse nuclear Mx1 protein (72 kD), Induced by interferons (among


(604-620)
20 other proteins) . Selectively inhibits influenza virus mRNA


(SEQ ID NO: 76)
synthesis in the nucleus and virus multiplication. The cytoplasmic 



Mx2 has R→S and R→E changes in this region.


 


CGYGPKKKRKV 
Synthetic peptides crosslinked to bovine serum albumin (BSA) and


(SV40 large T) 
introduced into MCF 7 or HeLa S3 cells with viral co-internalization


(SEQ ID NO: 77)
method using adenovirus serotype 3B induced nuclear import of BSA.


CGYGDRNKKKKE 



(human retinoic



acid receptor)



(SEQ ID NO: 78)



CGYGARKTKKKIK



(human  



glucocorticoid



receptor)



(SEQ ID NO: 79)



CGYGIRKDRRGGR



(human estrogen 



receptor)



(SEQ ID NO: 80)



CGYGARKLKKLGN



(human androgen 



receptor)



(SEQ ID NO: 81)



 


RKRQRALMLRQAR
Human XPAC (xeroderma pigmentosum group A complementing


30-42
protein) involved in DNA excision repair. By site-directed


(SEQ ID NO: 82)
mutagenesis and immunofluorescence. NLS is encoded by exon 1



which is not essential for DNA repair function.


 


EYLSRKGKLEL 
T-DNA -linked VirD2 endonuclease of the Agrobacterium


(SEQ ID NO: 83)
tumefaciens tumor-inducing (Ti) plasmid. A fusion protein with β-


(at the 
galactosidase is targeted to the nucleus. The T-plasmid integrates


N-terminus)
into plant nuclear DNA; VirD2 produces a site-specific nick for T



integration. VirD2 also contains a bipartite NLS at its C-terminus



(see Table 2).


 


KKSKKKRC  
Putative core NLS of yeast TRM1 (63 kD) that encodes the tRNA


(SEQ ID NO: 84)
modification enzyme N2, N2-dimethylguanosine-specific tRNA


(95-102)
methyltransferase. Localizes at the nuclear periphery. The 70-213



amino acid segment of TRM1 causes nuclear localization of β-



galactosidase fusion protein in yeast cells. Site-directed



mutagenesis of the 95-102 peptide resulted in its cytoplasmic



retention. TRM1 is both nuclear and mitochondrial. The 1-48



amino acid segment specifies mitochondrial import.


 


PQSRKKLR 
Max protein; specifically interacts with c-Myc protein. Fusion of


(SEQ ID NO: 85)
126-151 segment of Max to chicken pyruvate kinase (PK) gene, 



including this putative NLS, followed by transfection of COS-1  



cells and indirect immunofluorescence with anti-PK showed nuclear



targeting.


 


QPQRYGGGRGRRW 
Gag protein of human foamy retrovirus; a mutant that completely 


(SEQ ID NO: 86)
lacks this box exhibits very little nuclear localization; 



binds DNA and RNA in vitro.
















TABLE 4







“Bipartite” or “split” NLS








Signal Oligopeptide
Protein and features





C-terminus
Xenopus nucleoplasmin. Deletion analysis demonstrated



the presence of a signal responsible for nuclear



location.


 


TKKAGQAKKK
Xenopus nucleoplasmin


(SEQ ID NO: 87)



 


TKKAGQAKKKKLD
Xenopus nucleoplasmin. Whereas these 17 amino acids


(SEQ ID NO: 88)
had NLS activity, shorter versions of the 17 amino



acid sequences were unable to locate pyruvate



kinase to the nucleus.


 


TKKAGQAKKK(KLD)
Xenopus nucleoplasmin. This 14 amino acid segment was


(SEQ ID NO: 89)
identified as a minimal nuclear location sequence but



was unable to locate puruvate kinase to the nucleus;



three more amino acids at either end (shown in



parenthesis) were needed.


 


CGQAKKKKLD
Xenopus nucleoplasmin-derived synthetic peptide;


(SEQ ID NO: 90)
crosslinked to chicken serum albumin and micro-



injected to HeLa cells specified nuclear localization.



This suggests that nucleoplasmin may possess a simple



NLS.


 


KRPAMINO ACID
Xenopus nucleoplasmin bipartite NLS. Two clusters of


TKKAGQAKKKK
basic amino acids (underlined) separated by 10 amino


(SEQ ID NO: 91)
acid are half NLS components.


 


HRKYEAPRHx6PRKR
Yeast L3 ribosomal protein (387 amino acid) N-


(SEQ ID NO: 92)
terminal 21 amino acid. Possible bipartite NLS.



(Ribosomal proteins are transported to the nucleus



to assemble with nascent rRNA). Fusion genes with



β-galactosidase were used to transform yeast cells



followed by fluorescence staining with b-gal



antibody. The 373 amino acid of L3 fused to β-gal



failed to localize to the nucleus, unless a 8



amino acid bridge containing a proline was in-



serted between L3 and β-gal.


 


NKKKRKLSRGSSQKTKGTSASAK
SV40 Vp3 structural protein. (35 amino acid C-


ARHKRRNRSSRS
terminus). By DEAE-dextran-mediated transfection


(one sequence)
of TC7 cells with mutated constructs.


(SEQ ID NO: 93)



 


RVTIRTVRVRRPPKGKHRK
Simian sarcoma virus v-sis gene product (p28sis).


(SEQ ID NO: 94)
The cellular counterpart c-sis gene encodes a



precursor of the PDGF B-chain (platelet-derived



growth factor). The NLS is 100% conserved be-



tween v-sis gene product and PDGF. This protein



is normally transported across the ER; intro-



duction of a charged amino acid within the



hydrophobic signal peptide results in a mutant



protein that is translocated into the nucleus.



Puruvate kinase-NLS fusion product is trans-



ported less efficiently than cytoplasmic v-sis



mutant proteins to the nucleus.


 


KRKIEEPEPEPKKAK
Putative bipartite NLS of Xenopus laevis protein


(SEQ ID NO: 95)
factor xnf7. Inferred by similarity to the



bipartite NLS of nucleoplasmin. During oocyte



maturation xnf7 is cytoplasmic until mid-



blastulagastrula stage due to high phos-



phorylation. Partial dephosphorylation



results in nuclear accumulation.


 


KKYENVVIKRSPRKRGRPRKD
Yeast SWI5 gene product, a transcription factor.


(SEQ ID NO: 96)
Underlined basic amino acid show similarity to



bipartite NLS of Xenopus nucleoplasmin. The



SWI5 gene is transcribed during S, G2 and M



phases, during which the SWI5 protein remains



cytoplasmic due to phosphorylation by CDC28-



dependent histone H1 kinase at three serine



residues two near and one (double underlined)



in the NLS. Translocated at the end of



anaphase/G1 due to dephosphorylation of NLS.



NLS confers cell cycle-regulated nuclear



import of SWI5-β-galactosidase fusion protein.


MKRKRNS 735-741
Bipartite NLS of influenza virus polymerase


(SEQ ID NO: 97)
basic protein 2 (PB2). Mutational analysis of


GIESIDNVMGMIGILPDMTPSTE
PB2 and transfection of BHK cells showed that


MSMRGVRISKMGVDETSSAEKIV
both regions are involved in nuclear import.


449-495 
Deletion of 449-495 region gives perinuclear


(SEQ ID NO: 98)
localization to the cytoplasmic side.


 


AHRARRLH 
“Tripartite” or “doubly bipartite” NLS of


(SEQ ID NO: 99)
adenovirus DNA polymerase (AdPoI). BSI and


6-13 (BSI)
II functioned interdependently as an NLS for


PPRRRVRQQPP
the nuclear targeting of AdPoI, for which


(SEQ ID NO: 100)
BSIII was dispensable. BSII-III was more


23-33 (BSII)
efficient NLS than BSI-II.


PARARRRRAP



(SEQ ID NO: 101)



39-48 (BSIII)



 


KRKx11KKKSKK 207-226
Human poly(ADP-ribose) polymerase (116 kD).


(SEQ ID NO: 102)
The linear distance between the two basic



clusters is not crucial for NLS activity



in this bipartite NLS. Lysine 222 (double



underlined) is an essential NLS component.



DNA binding and poly(ADP-ribosyl)ating



active site are independent of NLS.


 


GRKRAFHGDDPFGEGPPDKKGD
Herpes simplex virus ICP8 protein (infected-


(SEQ ID NO: 103)
cell protein). This C-terminal portion of



ICP8 introduced into pyruvate kinase (PK)



caused nuclear targeting in transfected



Vero cells. Inclusion of additional ICP8



regions to PK led to inhibition of nuclear



localization.


 


KRPREDDDGEPSERKRARDDR
Bipartite NLS of VirD2 endonuclease of


(SEQ ID NO: 104)
rhizogenes strains of Agrobacterium



tumefaciens. Within the C-terminal 34



amino acid. Each region (underlined)



independently directs ”β-glucuronidase



to the nucleus, but both motifs are



necessary for maximum efficiency.



VirD2 is tightly bound to the 5′ end



of the single stranded DNA transfer



intermediate T-strand transferred from



Agrobacterium to the plant cell genome.
















TABLE 5







“Nonpositive NLS” lacking clusters of arginines/lysines








Signal oligopeptide
Protein and features





QLVWMACNSAMIN
Influenza virus nucleoprotein (NP). The underlined region


O
(327-345) when fused to chimpanzee a1-globin at the cDNA level and


ACIDFEDLRVLSFIRGTKVS
microinjected into Xenopus oocytes specifies nuclear localization.


PRG 327-356



(SEQ ID NO: 105)



 


MNKIPIKDLLNPQ
Yeast MAT a2 repressor protein, containing a homeodomain.


(NLS1 at N-terminus) (SEQ ID
The two NLS are distinct, each capable of targeting β-galactosidase to


NO: 106)
the nucleus. However, deletion of NLS2 results in a2 accumulation at


VRILESWFAKNIEN
the pores. NLS1 and 2 may act at different steps in a localization


PYLDT (NLS2 at amino acid
pathway. Part of the homeodomain mediates nuclear localization in


141-159, part of the
addition to DNA binding. The core pentapeptide containing proline and


homeodomain)
two other hydrophobic amino acids flanked by lysines or arginines


(SEQ ID NO: 107)
(underlined) was suggested as one type of NLS core.


 


Rx7Kx15KIPRx3HFY
Drosophila HP1 (206 amino acids) that binds to


EERLSWYSDNED (SEQ ID
heterochromatin and is involved in gene silencing. NLS identified by β-


NO: 108)
galactosidase/HP1 fusion proteins introduced by P-element mediated


152-206 (C-terminal
transformation into Drosophila embryos.


segment)



 


FVx7_20MxSLxYMx4MF
Adenovirus type 5 E1A internal, developmentally-regulated



NLS. This NLS functions in Xenopus oocytes but not in somatic cells.



This NLS can be utilized up to the early neurula stage.
















TABLE 6







Nucleolar localization signals (NoLS)








Signal oligopeptide
Protein and features









Nucleolus localization signal in amino terminus of human p27X-III protein (also called Rex) of T cell leukemia virus type I



(HTLV-I). When this peptide is fused to N-terminus of β-



galactosidase, directs it to the nucleolus. Deletion of residues 2-



8 (underlined), 12-18 (double-underline) or substitution of the



central RR (dotted-underlined) with TT abolish nucleolar



localization. Other amino acids between positions 20-80



increase nucleolar localization efficiency.


RLPVRRRRRRVP (SEQ ID NO: 110)
Adenovirus pTP1 and pTP2 (preterminal proteins, 80 kD)



between amino acid residues 362-373. The 140 kD DNA



polymerase of adenovirus when it has lost its own NLS can



enter the nucleus via its interaction with pTP. The staining was



nuclear and nucleolar with some perinuclear staining as well.



The NLS fused to the N-terminus of E. coli β-galactosidase was



functional in nuclear targeting.


GRKKRRQRRRP
HIV (human immunodeficiency virus) Tat protein; localizes


(SEQ ID NO: 111)
pyruvate kinase to the nucleolus. Tat is constitutively nucleolar.


RKKRRQRRR(AHQ)
Tat positive trans-activator protein of HIV-1 (human


Nucleolar localization signal
immunodeficiency virus type 1). The 3 amino acids shown in


(SEQ ID NO: 112)
parenthesis are essential for the localization of the β-



galactosidase to the nucleolus. The 9 amino acid basic region is



able to localize β-gal to the nucleus but not to the nucleolus.


KRVKLDQRRRP (SEQ ID NO: 113)
Artificial sequence from c-Myc and HIV Tat NLSs that



effectively localizes pyruvate kinase to the nucleolus.


FKRKHKKDISQNKRAVRR
Human HSP70 (heat shock protein of 70 kD); localizes pyruvate


(SEQ ID NO: 114)
kinase to the nucleus and nucleolus. HSP70 is physiologically



cytoplasmic but with heat-shock HSP70 redistributes to the



nucleoli, suggesting that the nucleolar targeting sequence is



cryptic at physiological temperature and is revealed under heat-



shock.


RQARRNRRRRWRERQR (35-50)
HIV-1 Rev protein (116 amino acid, nucleolar). Mutations in


(SEQ ID NO: 115)
either of the two regions of arginine clusters severely impair



nuclear localization. β-galactosidase fused to R4W was targeted



to the nucleus, and fused to the entire 35-50 region, was targeted



to the nucleolus.


RQARRNRRRRWRERQRQ (35-51)
HIV-1 Rev protein. A fusion of this Rev peptide with β-


(SEQ ID NO: 116)
galactosidase became nuclear but not nucleolar. The 1-59 amino



acid segment of Rev fused to β-galactosidase localized entirely



within the nucleolus. Whereas the NRRRRW (bold) is



responsible for nuclear targeting, the RR and WRERQRQ



(double underlined) specify nucleolar localization. Rev may



function to export HIV structural mRNAs from the nucleus to



the cytoplasm.
















TABLE 7







Karyophilic clusters on non-membrane protein kinases











Non-membrane




Karyophilic peptides
protein kinase
Species
Features





73 FVVHKRCHE
Protein kinase C (673
Bovine, human
Known to translocate to the


(SEQ ID NO: 117)
aa)
β type
nucleus following treatment of


96 DDPRSKHKFKIH


cells with mitogens.


(SEQ ID NO: 118)





577 TKHPGKRLG





(SEQ ID NO: 119)





 


71 FVVHRRCHEF
Protein kinase C (697
bovine, human γ



(SEQ ID NO: 120)
aa)
type



95 DDPRNKHKFRLH





(SEQ ID NO: 121)





591 TKHPAKRLG





(SEQ ID NO: 122)





 


72 FVVHKRCHE
Protein kinase C (673
rabbit type α and



(SEQ ID NO: 123)
aa)
β



96 DDPRSKHKFKIH





(SEQ ID NO: 124)





577 TKHPGKRLG





(SEQ ID NO: 125)





 


71 FVVHRRCHE
PKC-I (701 aa)
rat brain



(SEQ ID NO: 126)





95 DDPRNKHKFRLH





(SEQ ID NO: 127)





594 TKHPGKRLG





(SEQ ID NO: 128)





 


22 GENKMKSRLRKG
Protein kinase C
Drosophila
14 exons, 20 kb; 3 transcripts in


(not conserved)
(639 aa, 75 kDa)

adult flies; not expressed in 0-3 h


(SEQ ID NO: 129)


Drosophila embryos; the


80SYVVHKRCHEYVT


VVHKRCHE (SEQ ID


(conserved)


NO: 133)motif (or VVHRRCHE


(SEQ ID NO: 130)


(SEQ ID NO: 134)) is conserved


211PDDKDQSKKKTR


among all PKC known.


TIK (not conserved)





(SEQ ID NO: 131)





614PPFKPKIKHRKMC





P (not conserved)





(SEQ ID NO: 132)





 


148 KKVLQDKRFK
Glycogen synthase
rat brain
Phosphorylates glycogen synthase,


NRELQIMRKLD (SEQ
kinase 3

c-Jun, c-Myb; two isoforms


ID NO: 135)
GSK-3α

encoded by discrete genes; highly



(483 aa)

expressed in brain; both α and β



GSK-313

forms are cytosolic but also



(420 aa)

associated with the plasma





membrane consistent with their





role in signal transduction from the





cell surface.


 


LQDRRFKNRELQ
Zw3
Drosophila
Product of the segment polarity


(SEQ ID NO: 136)
zeste-white 3

gene zw3; the protein encoded has





34% homology to cdc2; mutations





in zw3 give embryos that lack





most of the ventral denticles,





differentiated structures derived





from the most anterior region of





each segment.


 


289ECLKKFNARRKL
Ca2+/calmodulin-
rat brain
Composed of nine 50 kDa α-


KGAIL
dependent protein

subunits and three 60 kDa β-


(SEQ ID NO: 137)
kinase II (CaM kinase

subunits; both are catalytic;



II) β subunit (542 aa,

calmodulin- and ATP-binding



60.3 kDa)

domains; highly expressed in





forebrain neurons, concentrated in





postsynaptic densities; acts as a





Ca2+-triggered switch and could be





involved in long-lasting changes in





synapses.


 


290LKKFNARRKL
CaM kinase II (478
rat brain
This particular isoform is


KGAILTTM (SEQ ID
aa, 54 kDa)

exclusively expressed in the brain;


NO: 138)
α-subunit

high enzyme levels in specific


450EETRVWHRRDGK


brain areas; might be involved in


(SEQ ID NO: 139)


short- and long-term responses to





transient stimuli.


 


185 GFAKRVKGRT
CADPK catalytic
bovine (cardiac
By Edman degradation of protein


WTLCG
subunit (349 aa, 40.6
muscle)
fragments; mediates the action of


(SEQ ID NO: 140)
kDa)

and is activated by cAMP; consists





of two regulatory (R) and two





catalytic (C) subunits; cAMP





releases the C subunit from the





inactive R2C2 cADPK; two





cDNAs were cloned encoding two





isoforms of the catalytic subunit of





cADPK in mouse.


 


186 GFAKRVKGRTW
CADPK
bovine
cDNA was isolated by screening a


TLCG
(catalytic subunit)

bovine pituitary cDNA library;


(SEQ ID NO: 141)
(350 aa)

93% sequence similarity to known





bovine cADPK; represents the





second gene for the catalytic





subunit of cADPK.


 


29 EEEIQELKRKLH
CGDPK (SEQ ID
bovine lung
By protein sequencing; composed


KCQSVLP (SEQ ID
NO: 144)

of two identical subunits activated


NO: 142)
(670 aa, 76.3 kDa)

in an allosteric manner by binding


389 KILKKRHIVDTR


of cGMP and not by dissociation


(SEQ ID NO: 143)


of catalytic subunit as in cADPK;





sequence similar to cADPK


 


117 KTLKKHTIVK
TPK3
S. cerevisiae
cAMP-DPK is a tetrameric protein


(SEQ ID NO: 145)
(398 aa)

with two catalytic and two



cADPK

regulatory subunits; cAMP





activates the kinase by dissociating





the catalytic subunits from the





tetramer; all three TPK 1, 2, 3 are





catalytic subunits.


 


16S2H13GHG2
SNF1 (633 aa, 72 kDa)
S. cerevisiae
Ser/Thr kinase;


166 EYCHRHKIVHRD


autophosphorylated; plays a


LKP (SEQ ID NO: 146)


central role is carbon catabolite


495 PLVTKKSKTRWH


repression in yeast required for


FG (SEQ ID NO: 147)


expression of glucose-repressible





genes; region 60-250 shows high





sequence similarity to cAMP-





dependent protein kinase





(cADPK).


 


70 PVKKKKIKREIK
Casein kinase II (α-
Drosophila
CKII is composed of α and β


(SEQ ID NO: 148)
subunit, catalytic)
melanogaster
subunits in a α2β2 130-150 kDa


269 DILQRHSRKRW
(336 aa)

protein; the α-subunit is the


ERF (SEQ ID NO: 149)


catalytic and the β is


146 PKSSRHHHTDG
CKII (β-subunit,
Drosophila
autophosphorylated.


(SEQ ID NO: 150)
regulatory) (215 aa)
melanogaster



142 PKSSRHHHTDG
CKII (β-subunit,
bovine (lung)



(SEQ ID NO: 151)
regulatory) (209 aa,





24.2 kDa)




 


108 PKQRHRKSLG
KIN1 (1064 aa, 117
S. cerevisiae
30% aa similarity to bovine


(SEQ ID NO: 152)
kDa)

cADPK and 27% (KIN1) or 25%


129 GSMCKVKLAK


(KIN2) aa similarity to v-Src


HRYTNE


within the kinase domain; the


(SEQ ID NO: 153)


catalytic domains of KIN1 and


506 DRKHAKIRNQ


KIN2 are near the N-terminus and


(SEQ ID NO: 154)


are structural mosaics with features


638 GNIFRKLSQRR


characteristic of both Tyr and


KKTIEQ


Ser/Thr kinases.


(SEQ ID NO: 155)





773 PPLNVAKGRKL





HP (SEQ ID NO: 156)





 


87 ELRQFHRRSLG
KIN2 (1152 aa, 126
S. cerevisiae



(SEQ ID NO: 157)
kDa)




111 GKVKLVKHRQ





TKE (SEQ ID NO: 158)





217 GSLKEHHARKF





ARG (SEQ ID NO: 159)





807 LSVPKGRKLHP





(SEQ ID NO: 160)





 


60FLRRGIKKKLTLD
STE7 (515 aa)
S. cerevisiae
Implicated in the control of the


(SEQ ID NO: 161)


three cell types in yeast: (a, α, and


472 PSKDDKFRHWC


a/α) of which a and α cells are


RKIKSKIKEDKRIKRE


haploid and are specialized for


(SEQ ID NO: 162)


mating whereas a/α cells are





diploid and are specialized for





meiosis and sporulation; with the





exception of the mating type locus,





MAT, all cells contain the same





DNA sequences. STE7 gene





produces insensitivity to cell-





division arrest induced by the yeast





mating hormone, α-factor.


 


722 QRRVKKLPSTTL
S6KIIα (733aa)
Xenopus



(SEQ ID NO: 163)





 


QRRVKKLPSITL
S6KII β
Xenopus



(SEQ ID NO: 164)





 


742 QRRVKKLPSTTL
S6KII (752 aa)
Chicken



(SEQ ID NO: 165)





 


713QRRVRKLPSTTL
S6KII (724 aa)
Mouse



(SEQ ID NO: 166)





 


16GVVYKGRHKTTG
CDC2Hs
Human
Isolated by expressing a human


(SEQ ID NO: 167)
(297 aa)

cDNA library in S. pombe and


120 FCHSRRVLHRD
p34cdc2

selecting for clones that


LKP (SEQ ID NO: 168)


complement a mutation in the cdc2





yeast gene; the human CDC2 gene





can complement both the





inviability of a null allele of S.





cerevisiae CDC28 and cdc2





mutants of S. pombe; CDC2





mRNA appears after that of





CDK2.


 


GVVYKARHKLSGR
cdc2 (297 aa)
S. pombe
High homology to S. cerevisiae


(SEQ ID NO: 169)


CDC28.


119HSHRVLHRDLKP
CDK2 (cell division
Human
The human CDK2 protein has 65%


(SEQ ID NO: 170)
kinase 2) (298 aa)

sequence identity to human





p34cdc2 and 89% sequence





identity to Xenopus Eg1 kinase;





human CDK2 was able to





complement the inviability of a





null allele of S. cerevisiae CDC28





but not cdc2 mutants in S. pombe.





CDK2 mRNA appears in late





G1/early S.


 


109 FCHSHRVLHRD
Eg1 (297 aa)
Xenopus
Cdk2-related


LKP (SEQ ID NO: 171)





 


125 GIAYCHSHRILH
CDC28 (298 a)
S. cerevisiae
The homolog of S. pombe Cdc2


RDLKP





(SEQ ID NO: 172)





 


119 HSHRVIHRDLKP
cdk3 (305 aa)
Human



(SEQ ID NO: 173)





 


56 KELKHKNIVR
PSSALRE (291 aa)
Human
cdc2-related kinase.


(SEQ ID NO: 174)
(SEQ ID NO: 175)




1 MDRMKKIKRQ (N-
PCTAIRE-1 (496 aa)
Human
cdc2-related kinase.


terminus) (SEQ ID





NO: 176)





141 DKPLSRRLRRV





(SEQ ID NO: 177)





 


1 MKKFKRR
PCTAIRE-2 (523 aa)
Human
cdc2 related kinase.


(SEQ ID NO: 178)





129 RNRIHRRIS





(SEQ ID NO: 179)





172 SRRSRRAS





(SEQ ID NO: 180)





304 HRRKVLHR





(SEQ ID NO: 181)





512 GHGKNRRQSM





LF (SEQ ID NO: 182)





 


163 HTRKILHR
PCTAIRE-3
Human
cdc2 related kinase.


(SEQ ID NO: 183)
(380 aa)




369 PGRGKNRRQSIF





(SEQ ID NO: 184)





 


69 EVFRRKRRLH
KKIALRE (358 aa)
Human
cdc2-related kinase.


(SEQ ID NO: 185)
(SEQ ID NO: 187)




302 DKPTRKTLRKSR





KHH (SEQ ID NO: 186)





 


1 MVKRHKNT
mim1+ gene product
S. pombe



(SEQ ID NO: 188)
(new inducer of




87 DGELFHYIRKHGP
mitosis); protein




(SEQ ID NO: 189)
kinase (370 aa)




114 DAVAHCHRFRFR





HRD (SEQ ID NO: 190)





295 KKSSSKKVVRRL





QQRDD





(SEQ ID NO: 191)





 


194 PAQKLRKKNNFD
Wee1+ gene product
S. pombe
The Wee1+ gene functions as a


(SEQ ID NO: 192)
(877 aa)

dose-dependent inhibitor that


388 KQHRPRKNTNFT


delays the initiation of mitosis


PLPP (SEQ ID NO: 193)


until the yeast cell has attained a


592 KYAVKKLKVKF


certain size; Wee1 has a protein


SGP (SEQ ID NO: 194)


kinase consensus probably





regulating cdc2 kinase.


 


266 PNETRRIKRAN
CDC7 (497 aa)
S. cerevisiae
Required for mitotic but not


RAG (SEQ ID NO: 195)


meiotic DNA replication





presumably to phosphorylate





specific replication protein factors;





implicated in DNA repair and





meiotic recombination; some





homology with CDC28 and





oncogene protein kinases but





differs in a large region within the





phosphorylation receptor domain.


 


48YDHVRKTRVAIKK
ERK1 (MAP kinase)
Rat
Known to translocate to the


(SEQ ID NO: 196)
(367 aa; 42 kDa)

nucleus following their activation





by phosphorylation at T-190, and





Y-192 (T-183, Y-185 in ERK2).


 


59 ILKHFKHE
FUS3 (353 aa)
S. cerevisiae
MAP-(ERK1)-related.


(SEQ ID NO: 197)





 


252 QIKSKRAKEY
KSS1 (368 aa)
S. cerevisiae
MAP-(ERK1)-related.


(SEQ ID NO: 198)





 


ELVKHLVKHGSN
SWI6
S. cerevisiae
Activator of CACGA-box with


(SEQ ID NO: 199)
(803 aa, 90 kDa)

sequence similarity to cdc10;


GKAKKIRSQLL


required at START of cell cycle.


(SEQ ID NO: 200)





 


EQRLKRHRIDVSDED
cdc10
S. pombe



(SEQ ID NO: 201)





SNIKSKCRRVV





(SEQ ID NO: 202)





 


37 PPKRIRTD
CTD kinase (528 aa)
S. cerevisiae
Consists of 3 subunits of 58, 38,


(suggested by the
58 kDa subunit

and 32 kDa; disruption of the 58


authors) (SEQ ID
(catalytic)

kDa gene gives cells that lack CTD


NO: 203)


kinase, grow slowly, are cold


492 KLARKQKRP


sensitive, but have different


(SEQ ID NO: 204)


phosphorylated forms of RNA pol





II.


 


29 GVSSVVRRCIHKP
Phosphorylase kinase
Rabbit (skeletal



(SEQ ID NO: 205)
(catalytic subunit)
muscle)




(386 aa)




 


489 KKYMARRKW
Myosin light chain
Chicken gizzard
Ca2+/calmodulin-activated;


QKTGHAV
kinase (MLCK) (669

phosphorylated by cADPK; first


(SEQ ID NO: 206)
aa)

described as responsible for the





phosphorylation of a specific class





of myosin light chains; required





for initiation of contraction in





smooth muscle.


 


314 PWLNNLAEKAK
Myosin light chain
Rabbit (skeletal
By protein sequencing.


RCNRRLKSQ
kinase (partial 368
muscle)



(SEQ ID NO: 207)
carboxy-terminal aa




334 ILLKKYLMKRR
sequence)




WKKNFIAVS





(SEQ ID NO: 208)





 


28 GVSSVVRRCIHKP
Phosphorylase kinase
Mouse (muscle)
Glycogenolytic regulatory enzyme;


(SEQ ID NO: 209)
(PhK) (catalytic γ

undergoes complex regulation;



subunit) (389 aa)

composed of 16 subunits





containing equimolar ratios of α, β,





γ and δ subunits; high levels in





skeletal muscle; isoforms in





cardiac muscle and liver; cDNA





probe does not hybridize to X





chromosome in mice and is thus





distinct from the mutant recessive





PhK deficiency that results in





glycogen storage disease.
















TABLE 8







Nuclear localization signals on DNA repair proteins











Gene
Equivalent protein



Putative NLS
product
in other species
Features










HIGHER EUKARYOTES










None
ERCC1
RAD10
297 aa; DBD; interacts


(N-terminus)


strongly with ERCC4 (XPF)


MDPGKDKEGvpqpsgppaRKKF


to form an excision


(bipartite NLS)


endonuclease; unless the


(SEQ ID NO: 210)


KDKx11RKK is a bipartite





NLS it may depend upon its





binding with ERCC4 for its





nuclear import.


None
ERCC2
RAD3 (S. cer)
760 aa; DNA helicase


681DKRFARGDKRGKLPR
(XPD)

component of TFIIH,


(near the C-terminus)(four


essential for cell viability;


positive, one negative over


contains one nucleotide-


a heptapeptide stretch)


binding, one DNA-binding,


(SEQ ID NO: 211)


and seven domains





characteristic of helicases;





52% identity with S. cer





RAD3 at the amino acid





level.


8 DRDKKKSRKRHYEDEE
ERCC3
SSL2 (S cer)
782 aa; helicase, component


(SEQ ID NO: 212)
(XPB)
Haywire(Dros)
of TFIIH essential for cell


522 YVAIKTKKRILLYTM


viability; helix-turn-helix,


(SEQ ID NO: 213)


DNA-BD, and helicase


(weak NLS if at all,


domains


hydrophobic environment)





769 PSKHVHPLFKRFRK





(SEQ ID NO: 214)





84 KKQTLVKRRQRKD
ERCC5
RAD2;
1186 aa in human, 1196 in X.


(SEQ ID NO: 215)
(XPG)
Rad13
laevis; 3′ incision


210 EFTKRRRTL


endonuclease; involved in


(SEQ ID NO: 216)


homologous recombination;


390 DESMIKDRKDRLP


strongly nuclear


(SEQ ID NO: 217)





1170 GKKRRKLRRARGRK





RKT (SEQ ID NO: 218)





253PQKQEKKPRKIMLNEASG
ERCC6
RAD26
1493 aa; involved in the


(SEQ ID NO: 219)
CS-B

preferential repair of active


314 PNKKARVLSKKEERLKK


genes; nonessential for cell


HIKKLQKR(SEQ ID NO: 220)


viability


406 PLPKGGKRQKKVP





(SEQ ID NO: 221)





455 DGDEDYYKQRLRRWNK





LRLQDKEKRLKLEDDSEESD





(SEQ ID NO: 222)





1028 DVQTPKCHLKRRIQP





X8PKRKKFP(SEQ ID NO: 223)





1180 KHKSKTKHHSVAEEETL





EKHLRPKQKPKX15PHLVKK





RRY(SEQ ID NO: 224)





1324 PAGKKSRFGKKRN





(SEQ ID NO: 225)





21 PASVRASIERKRQRALM
XPA
RAD14
273 aa; zinc finger domain;


LRGAR(SEQ ID NO: 226)


involved in lesion


160 PPLKFIVKKNPHHSQW


recognition


GD (weak)(SEQ ID NO: 227)





210 NREKMKQKKFDKKVKE





(weak because of F)





(SEQ ID NO: 228)





72 YLRRAMKRFN (weak)
XPC
RAD4 (23% identity,
823 aas, 92.9 kDa; very


(SEQ ID NO: 229)

44% similarity)
hydrophilic protein; might be


262 PSAKGKRNKGGRKKRSK


involved in lesion


PSSSEEDEGPG(SEQ ID


recognition since XPC cells


NO: 230)


(40% of all XP cases) can


297 QRRPHGRERR (weak)


repair active parts of the


(SEQ ID NO: 231)


genome whereas inactive and


368 RTHRGSHRKDP (weak)


the nontranscribed strand of


(SEQ ID NO: 232)


active genes are not repaired


384 SSSSSSSKRGKKMCSDG





(SEQ ID NO: 233)





531 ALKRHLLKYE (weak)





(SEQ ID NO: 234)





594 SNRARKARLAEP





(SEQ ID NO: 235)





660 PNLHRVARKLD (weak)





(SEQ ID NO: 236)





716 ERKEKEKKEKR





(SEQ ID NO: 237)





740 IRERLKRRYG





(SEQ ID NO: 238)





801 GGPKKTKRERK





(SEQ ID NO: 239)





20 KSKAKSKARREEEEED
XPC

940 aa; the first 117 aa are


(SEQ ID NO: 240)


lacking in the Legerski and


54 GKRKRG(SEQ ID NO: 241)


Peterson, (1992) XPC


69 GPAKKKVAKVTVK


sequence (see above); the


(SEQ ID NO: 242)


following 823 aa are


103 PSDLKKAHHLKRG


identical.


(SEQ ID NO: 243)





82 EIDRRKKRPLENDGPVKK
Rep-3
Swi4 (S pom)
1137 aa; mismatch repair


KVKKVQQKE(SEQ ID
(mouse)

protein; Rep-3 is in the


NO: 244)
Duc-1

immediate 5′ flanking region


375 KENVRDKKKG
(HeLa)

of DHFR gene (89 bp) but


(SEQ ID NO: 245)


transcribed from the opposite


571 FGRRKLKKWVT


strand; a bidirectional


(SEQ ID NO: 246)


promoter is used for both


710 PLIKKRKDEIQG


transcripts.


(SEQ ID NO: 247)





1091 KELEGLINTKRKRLKYF





AKLW (SEQ ID NO: 248)





422 EKHEGKHQKLL(weak)
hMSH2
MSH2 (S cer)
human mismatch repair


(SEQ ID NO: 249)


protein; homologous to S.





cerevisiae MSH2; associated





with the hereditary





nonpolyposis colon cancer





gene on chromosome 2p16.


397 PDIRRLTKKLNKRG
MSH2




(SEQ ID NO: 250)
(S cer)




547 DAKELRKHKKYIE





(SEQ ID NO: 251)





869 VKMAKRKANE





(SEQ ID NO: 252)





95 GELAKRSERRAEAE
Human Rad2
Rad2 (S. pom)
400 aa; required for fidelity


(SEQ ID NO: 253)


of chromosome separation at


354 KRKEPEPKGSTKKKAK


mitosis; limited similarity to


TG(SEQ ID NO: 254)


RAD2 (ssDNA nuclease),


394 GKFKRGK (SEQ ID


rad13, and XPG (ERCC5).


NO: 255)





None
mouse

339 aa; recombination-repair



RAD51

protein; 83% homology to S





cerevisiae RAD51 and 55%





homology to E. coli RecA.


None
HHR23B/
RAD23
Subunit of XPC (125 kDa)



p58




None
HHR23A
RAD23
Subunit of XPC (125 kDa)


32 PSQAEKKSRARAQ
RPA (34 kDa

RPA (70, 34, and 14 kDa


(SEQ ID NO: 256)
subunit)

subunits) might stabilize the





helicase-melted DNA around





the lesion; antibodies against





RPA 32 kDa subunit inhibit





DNA replication.


GAKKRKIDDA
ATPase Q1
RecQ (E. coli)
649 aa; altered in XPC cells;


(SEQ ID NO: 257)


undetermined role in repair


PKKPRGKM (SEQ ID NO: 258)
HMG-1

Calf thymus HMG 1


EHKKKHP (SEQ ID NO: 259)


(259 aa); involved in the


ETKKKFKDP (SEQ ID NO: 260)


recognition of cisplatin


EKSKKKK(E/D)41 (SEQ ID


lesions


NO: 261)





E3G2KKKKKFAK (SEQ ID





NO: 262)





512 RDEKKRKQLKKAKAK
SSRP1
ABF (S cer)
709 aa, 81 kDa, structure-


MAKDRKSRKKP (SEQ ID


specific recognition protein


NO: 263)


1; involved in recognition of


619 GESSKRDKSKKKKKVKV


cisplatin-induced lesions;


KMEKK (SEQ ID NO: 264)


also involved in Ig gene


674 GENKSKKKRRRSEDSEE


recombination; one HMG-


EE(SEQ ID NO: 265)


box, similarity to SRY,





MTFII, LEF-1, TCF-1a, and





ABF2.


1 MPKRGKKG(SEQ ID
Ref-1

Redox factor 1 from HeLa


NO: 266)
(HAP1)

cells; 37 kDa, 318 aa;





apurinic/apyrimidinic (AP)





endonuclease for DNA repair





but also of redox activity





stimulating Jun/Fos DNA





binding.


1 MPKRGKKG
HAP1
ExoIII
323 aa; apurinic/apyrimidinic


(SEQ ID NO: 267)
(bovine)
(E. coli)
(AP)-endonuclease




ExoA (S.





pneumoniae)



 







DROSOPHILA










1 MGPPKKSRKDRSGGDKF
Haywire
ERCC3 (XPB)
helicase with 66% identity to


GKKRRGQDE

SSL2 (S cer)
human ERCC3; flies


(SEQ ID NO: 268)


expressing marginal levels of


EMSYSRKRQRFLVNQG


Haywire display motor


(weak)(SEQ ID NO: 269)


defects and reduced life span


YYEHRKKNIGSVHPLFK





KFRG(bipartite)(SEQ ID





NO: 270)





77 ARGKKKQPK (SEQ ID
Rrp1
HAP1
Recombination repair protein


NO: 271)


1); 679 aa; the 252 aa C-


98 KPKGRAKKA (SEQ ID


terminal domain is


NO: 272)


homologous to AP-


157 QAKGRKKKELP (SEQ ID


endonucleases, whereas the


NO: 273)


1-426 aa domain is highly


179 EPPKQRARKE (SEQ ID


charged, carries all of the


NO: 274)


putative NLSs.


241 PPKAASKRAKKGK (SEQ





ID NO: 275)





282 PKKRAKKTT (SEQ ID





NO: 276)





317 EPAPGKKQKKSAD (SEQ





ID NO: 277)





336 EEEAKPSTETKPAKGR





KKAP (SEQ ID NO: 278)





372 KPARGRKKA (SEQ ID





NO: 279)





394 GSKTTKKAKKAE





(SEQ ID NO: 280)





 







S. CEREVISIAE










200 IEKRRKLYISGG
RAD1
ERCC4
1100 aa; 30% sequence


(SEQ ID NO: 281)

(XPF)
identity to Rad16; RAD1


515 NKKRGVRQVLLN (SEQ

Rad16
interacts strongly with


ID NO: 282)


RAD10


565 KEQVTTKRRRTRG





(conserved in Rad16)(SEQ ID





NO: 283)





1024 NLRKKIKSENKLQ





(SEQ ID NO: 284)





89 RQRKERRQGKRE
RAD2
XPGC
1031 aa, 117.8 kDa; ssDNA


(SEQ ID NO: 285)

Rad13
endonuclease; rad mutants


907 ENKFEKDLRKKLVNNE


are defective in incision


(SEQ ID NO: 286)





984 RDVNKRKKKGKQKRI





(SEQ ID NO: 287)





1017 KRISTATGKLKKRKM





(SEQ ID NO: 288)





672 GKDDYGVMVLADRRF
RAD3
ERCC2 or XPD;
778 aa, 89,779 Da; 30%


SRKRSQLP (contains the bulky
(S. cer)
Rad15 or Rhp3
sequence identity to rad16;


F)(SEQ ID NO: 289)


ATP-dependent DNA





helicase; single-stranded





DNA-dependent ATPase.


26 PLSRRRRVRRKNQPLPD
RAD4
XPC
754 aa; mutations in RAD4


AKKKFKTG (SEQ ID NO: 290)


that that inactivate the


134 NEERKRRKYFHMLYL


excision repair function of


(SEQ ID NO: 291)


RAD4 result in truncated


160 EWINSKRLSRKLSNL


proteins missing the C-


(weak) (SEQ ID NO: 292)


terminal one-third of RAD4.


254 EMSANNKRKFKTLKRSD





weak (SEQ ID NO: 293)





382 WMNSKVRKRRITKDDF





GEK (SEQ ID NO: 294)





403 RKVITALHHRKRTKID





DYED (SEQ ID NO: 295)





504 KTGSRCKKVIKRTVGRP





(SEQ ID NO: 296)





150 FHPKRRRIYGFR (SEQ
RAD5

1169 aa; helicase involved in


NO: 297)


postreplication-repair (RAD6


215 DSRGRKKASM (SEQ ID


epistasis group); binds DNA


NO: 298)


with the seven helicase


297 DGESLMKRRRTEGGNK


motifs and with zinc fingers;


REK (SEQ ID NO: 299)


increases the instability of


1152 DEDERRKRRIEE


poly (GT) repeats in the yeast


(SEQ ID NO: 300)


genome.


1 MSTPARRRLMRDFKRM
RAD6

RAD6 mediates the


KEDAPP (SEQ ID NO: 301)


ubiquitination of H2A and





H2B histones


15 GVAKLRKEKSGAD
RAD10
ERCC1
210 aa; forms an


(SEQ ID NO: 302)


endonuclease with RAD1;


76 DDYNRKRPFRSTRPGK


the basic and tyrosine-rich


(SEQ ID NO: 303)


central domain was





suggested to bind DNA by





ionic interactions and





tyrosine intercalation.


172 EGKAHRREKKYE
RAD14
XPAC
247 aa, 29.3 kDa; two zinc


(SEQ ID NO: 304)


fingers; involved in lesion


200 NRLREKKHGKAHIHH


recognition; 27% sequence


(SEQ ID NO: 305)


identity and 54% sequence





similarity (if conserved





residues are grouped





together) to human XPA;





deletion of RAD14 gene





generates high UV





sensitivity.


345 ERRKQLKKQGPKRP
Ixr1

591 aa; two consecutive


(SEQ ID NO: 306)
(S. cer)

HMG boxes; involved in


479 ETYKKRIKEWESCYPDE


recognition of 1,2-intrastrand


(SEQ ID NO: 307)


d(GpG) and d(ApG) cisplatin





crosslinks.


None
RAD23
HHR23



483 LTCKKLKTHNRIILSG
RAD26
ERCC6
1075 aa; disruption of the


weak (SEQ ID NO: 308)
(yeast
CS-B (hum)
RAD26 gene gives viable


934 NALRKSRKKITKQYEIGT
ERCC6)

yeast cells unable to


PX9GEIRKRDP


preferentially repair the


(SEQ ID NO: 309)


actively transcribed strands;





surprisingly, in contrast to





human CS-B cells, disruption





of the RAD26 in yeast does





not cause sensitivity to UV,





Cisplatin, or X-rays.


634 KPTSKPKRVRTATKKKIP
MRE11
Rad32 (S pom)
meiotic recombination


(SEQ ID NO: 310)


protein; functions in the


408 FYKKRSPVTRSKKSG


same pathway with RAD51


(SEQ ID NO: 311)





none;
RAD51
RecA (E. coli)
402 aa; essential for repair of


361 GFKKGKGCQR


DSBs and recombination;


(SEQ ID NO: 312)


associates strongly with





RAD52; self associates;





neither RAD51 nor RAD52





possess a typical simple





NLS.


none;
RAD51 (K.

364 aa


328 GFKKGKGCQR
lactis)




(SEQ ID NO: 313)





none;
RAD52
Rad22
504 aa; rad52 mutants are


155 ERAKKSAVTDALKRSLR


defective in ionizing


GFGX8DKDFLAKIDKVKFDP


radiation, mitotic


PD(tripartite)


recombination, mating-type


(SEQ ID NO: 314)


switching, and repair of





DSDs.


1 MARRRLPDRPP
RAD54

898 aa; recombination-repair


(SEQ ID NO: 315)


protein; ATP-binding motif;


65 GGRSLRKRSA


helicase domains; in the


(SEQ ID NO: 316)


same subfamily of helicases


99 QLTKRRKD


with MOT1 and SNF2.


(SEQ ID NO: 317)





269 DETVFVKSKRVKASSS
RAD55

Similarity to RecA, and


(extremely weak if at


lower similarity to RAD51,


all NLS)


RAD57, and DMC1


(SEQ ID NO: 318)





317 GEDRKREGRNLKR





(SEQ ID NO: 319)





371 PISRQSKKRKFDYRVP
RAD57

460 aa; nucleotide-binding


(SEQ ID NO: 320)


domain; limited similarity to





RAD51


62 GLKKPRKKTKSSRH
SSL2
ERCC3 (XPB)
843 aa; putative helicase that


(SEQ ID NO: 321)


seems to function in repair


688 GRILRAKRRNDEG


but also in the removal of


(SEQ ID NO: 322)


secondary structures in the 5′


784 GRGSNGHKRFKS (weak)


untranslated region of mRNA


(SEQ ID NO: 323)


to allow ribosome binding





and scanning.


50 TRRHLCKIKGLSE (weak)
DMC1
RecA
334 aa; yeast homolog of


(SEQ ID NO: 324)


RecA, meiosis-specific;


277 DGRKPIGGHX12RKGRG


dmc1 mutants are defective


DER (bipartite)(SEQ ID


in reciprocal recombination


NO: 325)


and accumulate DSBs


11 ETEKRCKQKEQRY
PMS1

904 aa, 103 kDa; mismatch-


(SEQ ID NO: 326)


repair protein; MutL





(Salmonella) and HexB





(Streptococcus) homolog


None
HRR25
Hhp1, Hhp1 (S pom)
Mutations in HRR25 Ser/Thr


1 MDLRVGRKFRIGRKIG

CKI (mamm
protein kinase cause defects


(SEQ ID NO: 327)


in DNA repair and


139 GRRGX8GLSKKYRDFNT


retardation in cell cycling


HRHIP (Bipartite weak NLS)





(SEQ ID NO: 328)





96 HELTKRSSRRVETEK
YKL510

383 aa; structure-specific


(SEQ ID NO: 329)


endonuclease; two domains





of about 100 aa with





sequence similarity to N- and





C-terminal regions of RAD2.


200 MLAMARRKKKMSAK
MOT1

Modifier of transcription 1;


(SEQ ID NO: 330)


1867 aa; DNA helicase of S.


617 EHYKVKHTEK (weak


cerevisiae required for


NLS)(SEQ ID NO: 331)


viability; increases gene


670 LHPEKKRSISE (weak


expression of several., but


NLS) (SEQ ID NO: 332)


not all, pheromone-





responsive genes in the





absence of STE12; the 1257





to 1825 aa domain (568 aa





residues) has homology to





SNF2 and RAD54


 







S. POMBE










60 SSIDEx5SIKRKRRI (SEQ ID
Swi4
Duc-1
113 kDa; KCII sites are


NO: 333)

Rep-3
upstream of NLS like in





SV40 large T; the





homologous prokaryotic





MutS and HexA lack NLS


96 GELAKRVARHQKARE
Rad2

380 aa


(weak NLS)(SEQ ID NO: 334)





362 GSAKRKRDS





(SEQ ID NO: 335)





372 KGGESKKKR





(SEQ ID NO: 336)





None
Rad9
—
427 aa; no homology to other





DNA repair proteins; rad9





fission yeast mutants are





sensitive to both UV and





ionizing radiation; may be





involved in recombination-





repair.


None
Rhp3 or
ERCC2
772 aa; DNA helicase; 65%


681 DKRYGRSDKRTKLPK
rad15
RAD3
identity to RAD3 and 55%


(SEQ ID NO: 337)


identity to ERCC2; essential





for viability


464 PPSKRRRVRGG
Rad16
RAD1
Function in repair of UV


(SEQ ID NO: 338)


damage for both cyclobutane





dimer and (6-4) photoproduct





lesions; Rad16 interacts with





Swi10.


431 DFKQAILRKRKNESPE
Rad21

628 aa, 67.8 kDa, acidic


EVEP (SEQ ID NO: 339)


protein; a single base





substitution in mutant rad21-





45, changing an Ile into a





Thr, is responsible for the





low efficiency in repair of





DSBs after g-radiation





although capable of arresting





at G2.


490 DKKAKKG (SEQ ID
Rad22
RAD52
496 aa; functions in


NO: 340)


recombination-repair and





mating-type switching.


394 DVVQFYLKKKYTRSKRN
Rad32
MRE11 (S cer)
648 aa; meiotic


DG (weak because of Y) (SEQ


recombination protein; rad32


ID NO: 341)


mutants are sensitive to g-


575 PSPALLKKTNKRRELP


and UV radiation; functions


(SEQ ID NO: 342)


in the same pathway with





Rhp51 (RAD51).



Rad51

recombination-repair


GLAKKYRDHKTHLHIP(weak
Hhp1
CKI (mamm)
Ser/Thr protein kinase;


NLS because of Y and H)(SEQ

HRR25 (S cer)
mutation in this gene causes


ID NO: 343)


repair defects


None
Hhp2
CKI (mamm)
Ser/Thr protein kinase;


GLAKKYRDFPKTHVHIP(H in

HRR25 (S cer)
mutation in this gene causes


Hhp1 is replaced by F in


repair defects


Hhp2)





(SEQ ID NO: 344)
















TABLE 9







NLS in Transcription factors








NLS and Flanks
Protein factor and features





highly basic



HR4QRTRK7R (SEQ ID
Human GCF (GC-factor)


NO: 345)



LRRKSRP (SEQ ID NO: 346)



SRRTKRRQ (SEQ ID NO: 347)



GRKRKKRT (SEQ ID NO: 348)
Oct-6 protein transcription factor from mouse cells


GRRRKKRT (SEQ ID NO: 349)
Mouse Oct-2 protein transcription factors (Oct-2.1 for Oct-2.6



isoforms)


ARKRKRT (SEQ ID NO: 350)
Oct-3 from mouse P19 embryonal carcinoma cells


NRRQKGKRS (SEQ ID



NO: 351)



ECRRKKKE
Human ATF-1. In basic region/leucine zipper.


(SEQ ID NO: 352)



ERKKRRRE (SEQ ID NO: 353)
Human ATF-3 (in basic region that binds DNA)


AKCRNKKKEKT (SEQ ID



NO: 354)



SKKKIRL (SEQ ID NO: 355)
Mouse Pu.1 (Friend erythroleukemia cells). Related to ets oncogene


QKGNRKKM (SEQ ID NO: 356)



VKKVKKKL (SEQ ID NO: 357)



VKRKKI (SEQ ID NO: 358)
Human PRDII-BF1 that binds to IFN-β gene promoter. (The largest


CRNRYRKLE (SEQ ID
DNA-binding protein known, of 298 kD).


NO: 359)



IRKRRKMK (SEQ ID NO: 360)



PKKKRLRL (SEQ ID NO: 361)



GKKKKRKREKL
Murine LEF-1 (397 aa). Lymphoid-specific with an HMG1-like box.


(within the HMG-box)
NLS is identical to that of human TCF-1α.


(SEQ ID NO: 362)



GKKKKRKREKL
Human TCF-1α (399 aa)


(within the HMG-box)
(T cell-specific transcription factor that activates the T cell receptor


(SEQ ID NO: 363)
Cα). Contains an HMG box. NLS core is identical to that of murine



LEF-1.


GKKKRRSREKH
Human TCF-1


(within the HMG-box) (SEQ ID
(uniquely T cell-specific). HMG box containing.


NO: 364)



PKKCRARF (SEQ ID NO: 365)



FKQRRIKL (SEQ ID NO: 366)
Xenopus laevis Oct-1 (within POU-domain)


NRRRKKRT (SEQ ID NO: 367)



NRRQKEKRI (SEQ ID NO: 368)



DKRSRKRKRSK (SEQ ID
Drosophila Suvar (3) 7 gene product involved in position-effect


NO: 369)
variegation (932 aas). Five widely spaced zinc-fingers could help


RLRIDRKRN (SEQ ID NO: 370)
condensation of the chromatin fiber.


AKRSRRS (SEQ ID NO: 371)



IRKRRKMKSVGD2E2 (SEQ ID
Human MBP-1 (class I MHC enhancer binding protein 1) mw 200


NO: 372)
kD. Induced by phorbol esters and mitogens in Jurkat T cells.


(not suggested as NLS by the



authors; between the 1st and 2nd



zinc finger)



PPKKKRLRLAE



(suggested as NLS by the



authors; just before 2nd zinc



finger) (SEQ ID NO: 373)



CRNRYRKLE



(within 1st zinc finger)



(SEQ ID NO: 374)



PRRKRRV (SEQ ID NO: 375)
rat TTF-1 (thyroid nuclear factor that binds to the promoter of


HRYKMKRQ (SEQ ID NO: 376)
thyroid-specific genes). An homeodomain protein.


DGKRKRKN (SEQ ID NO: 377)
Human thyroid hormone receptor α (c-erbA-1 gene). Belongs to the


DDSKRVAKRKL (SEQ ID
family of cytoplasmic proteins that are receptors of hydrophobic


NO: 378)
ligands such as steroids, vitD, retinoic acid, thyroid hormones. The


NRERRRKEE (SEQ ID NO: 379)
ligand binding may expose the NLS for nuclear import of the


WKQRRKF (SEQ ID NO: 380)
receptor-ligand complex.


NRRKRKRS (SEQ ID NO: 381)
Drosophila gcl (germ cell-less) gene product (569 aa, 65 kD), located


PKKKKL (SEQ ID NO: 382)
in nuclei, required for germ line formation.






C. elegans Sdc-3 protein (sex-determining protein) (2,150 aas). A zinc finger protein.


LKKIRRKIKNKI (SEQ ID
Drosophila BBF-2 (related to CREB/ATF)


NO: 392)



ESRRKKKE (SEQ ID NO: 393)



Group θθθθ



DRNKKKKE (SEQ ID NO: 394)
Xenopus RAR (retinoic acid receptor)


ARRRRP (SEQ ID NO: 395)



GRRRRA (SEQ ID NO: 396)
Human ATF-2 (the 2nd and 3rd NLS are in basic region that binds


DEKRRKV (SEQ ID NO: 397)
DNA)


CRQKRKV (SEQ ID NO: 398)



ERKRRD (SEQ ID NO: 399)
Myn (murine homolog of Max). Forms a specific DNA-binding


SRKKLRME (SEQ ID NO: 400)
complex with c-Myc oncoprotein through a helix-loop-helix/leucine



zipper.


EEKRKRTYE (SEQ ID NO: 401)
human NFκB p65 (550 aa).



Not binding DNA; complexed with p50 that binds DNA. NFκB p50



also contains a NLS (Table 3b).


GRRRRA (SEQ ID NO: 402)
Human HB16, a cAMP response element-binding protein


DEKRRKF (SEQ ID NO: 403)



SRCRQKRKV (SEQ ID



NO: 404)



SKKKKTKV (SEQ ID NO: 405)
Human TFIIE-β (general transcription initiation protein factor; forms


NRPDKKKI (SEQ ID NO: 406)
tetramer α2β2 with TFIIE-α)


QRRKKP (SEQ ID NO: 407)



QKKRRFKT (SEQ ID NO: 408)



SRKRKM (SEQ ID NO: 409)
Human kup transcriptional activator (433 aas). Two distantly spaced



zinc fingers. Expressed in hematopoietic cells and testis.


ERKRLRNRLA (SEQ ID
Mouse Jun-B homologue to avian sarcoma virus 17 oncogene v-jun


NO: 410)
product. One region is similar to yeast GCN4 and to Fos.


ATKCRKRKL (SEQ ID



NO: 411)



(19 aa stretch)



DKRx6ERKRRD (N-terminus)
Max (specifically associates with c-Myc, N-Myc, L-Myc). The Max-


(SEQ ID NO: 412)
Myc complex binds to DNA; neither Max nor Myc alone exhibit


QSRKKLRME (C-terminus)
appreciable DNA binding.


(SEQ ID NO: 413)







Chicken VBP (vitellogenin gene-binding protein). Leucine zipper. Related to rat DBP. 






Xenopus borealis B1 factor. Closely related to the mammalian USF. Binds to CACGTG in TFIIIA promoter to developmentally regulate its expression.






Human USF (upstream stimulatory factor) activating the major late adenovirus promoter


YRRYPRRRG (SEQ ID
YB-1, a protein that binds to the MHC class II Y box. YB-1 is a


NO: 421)
negative regulator.


QRRPYRRRRF (SEQ ID



NO: 422)



YRPRFRRG (SEQ ID NO: 423)



QRRYRRN (SEQ ID NO: 424)



YRRRRP (SEQ ID NO: 425)







Human TFEB Binds to IgH enhancer.






Human TFE3 (536 aa). Binds to μE3 enhancer of IgH genes.


KTVALKRRKASSRL (SEQ ID
Human Dr1 (176 aa, 19 kD). Interacts with TBP (TATA-binding


NO: 431)
protein) thus inhibiting association of TFIIA and/or TFIIB with TBP.



TBP-Dr1 association is affected by Dr1 phosphorylation to repress



activated and basal transcription.


1 LRRRGRQTY (SEQ ID
Drosophila ultrabithorax protein (from the conserved 61 amino acid


NO: 432)
homeodomain segment only). Conserved in the antenappedia


27 LTRRRRIEM (SEQ ID
homeodomain protein.


NO: 433)



51 QNRRMKLKKEI (SEQ ID



NO: 434)



SNRRRPDHR (SEQ ID NO: 435)
C. elegans sex-determining Tra-1 protein. Zinc finger. Peaks in the


VYRGRRRVRRE (SEQ ID
second larval stage.


NO: 436)



P7AP2RRRRSADNKD2 (SEQ



ID NO: 437)



PKKPRHQF (SEQ ID NO: 438)



EKRKKERN (SEQ ID NO: 439)
Yeast NPS1 transcription protein factor (1359 aa) involved in cell


LLRRLKKEVE (SEQ ID
growth control at G2 phase. Has a catalytic domain of protein


NO: 440)
kinases.


EPLGRIRQKKRVY2D2 (SEQ



ID NO: 441)



(EDAIKKRREARERRRLRQ)



(SEQ ID NO: 442)



DKETTASRSKRRSSRKKRT



(SEQ ID NO: 443)



ESKKKKPKL (SEQ ID NO: 444)



KKTAAKKTKTKS (SEQ ID



NO: 445)



QRKRQKL (SEQ ID NO: 446)
Human 243 transcriptional activator (968 aas), induced by mitogens


KAKKQK (SEQ ID NO: 447)
in T cells. N-terminal half is homologous to oncoprotein Rel and


LRRKRQK (SEQ ID NO: 448)
Drosophila Dorsal protein involved in development. The C-terminal



half contains repeats found in proteins involved in cell-cycle control



of yeast and tissue differentiation in Drosophila.


RDIRRRGKNKV (SEQ ID
Mouse NF-E2 (45 kD), an erythroid transcription factor from mouse


NO: 449)
erythroleukemia (MEL) cells. Involved in globin gene regulation.


QNCRKRKLE (SEQ ID
Binds to AP-1-like sites. Homology to Jun B, GCN4, Fos, ATF1 and


NO: 450)
CREB in basic region/leucine zipper (see FIG. 2).


Group θθθxθθ



DKIRRKN (SEQ ID NO: 451)
Human glucocorticoid receptor


ARKTKKKI (SEQ ID NO: 452)



473 DKIRRKNCP (SEQ ID
Mouse and human GR (glucocorticoid recptor)


NO: 453)



EARKTKKKIKGIQ (SEQ ID



NO: 454)



Group θθθxθ







C/EBP (CCAAT/enhancer binding protein). Functions in liver-specific gene expression.


DKIRRKN (SEQ ID NO: 458)
Human mineralocorticoid receptor


ARKSKKL (SEQ ID NO: 459)



DKIRRKN (SEQ ID NO: 460)
Human PR (progesterone receptor)


GRKFKKF (SEQ ID NO: 461)



EEVQRKRQKLMP (SEQ ID
Human and mouse NFκB 105 kD precursor of p50 (968 aas) (first R


NO: 462)
is at 361 position).


EEVQRKRQKL (SEQ ID
Human NF-κB p50 (DNA-binding subunit). Identical to protein


NO: 463)
KBF1, homologous to rel oncogene product. NF-κB p65 also



contains a NLS (Table 3a).


GKTRTRKQ (SEQ ID NO: 464)
Human TEF-1 (SV40 transcriptional enhancer factor 1). 426 aa.


ARRKSRD (SEQ ID NO: 465)







Rat, mouse, human IRF-1 (interferon regulatory factor-1). Induced in lymphoma T cells by the pituitary peptide hormone prolactin.



Regulates the growth-inhibitory interferon genes.


GKCKKKN (SEQ ID NO: 468)
Ehrlich ascites S-II transcription factor. A general factor that acts at



the elongation step.






Tobacco TAF-1 transcriptional activator


YKLDHMRRRIETDE (SEQ ID
Drosophila TFIIEα (433 aa), a general transcription factor for RNA


NO: 472)
polymerase II. Composed of subunits α and β.






Human ER (estrogen receptor); 595 aa.


EQRRHRIE (SEQ ID NO: 476)
Yeast ADA2 (434 aa), a potential transcriptional adaptor required for


TTRAEKKRLL (SEQ ID
the function of certain acidic activation domains.


NO: 477)



IDKKRSKEAKE (SEQ ID



NO: 478)



EAALRRKIRTISK
Yeast GCN5 gene product (439 aa), required for the function of


(SEQ ID NO: 479)
GCN4 transcriptional activator and for the activity of the HAP2-3-4



complex.


Group θθxθθ



NKKMRRNRF (SEQ ID
Mouse LFB3


NO: 480)



NRRKx4RQK (SEQ ID NO: 481)



TKKGRRNRF (SEQ ID
Mouse LFB1


NO: 482)



NRRKx4RHK (SEQ ID NO: 483)



NKKMRRNRFK (SEQ ID
rat vHNF1-A


NO: 484)



NKKMRRNR (SEQ ID NO: 485)
murine HNF-1β


TKKGRRNRF (SEQ ID
mouse HNF-1


NO: 486)



NKKMRRNRF (SEQ ID
human vHNF1


NO: 487)



TKKGRRNRF (SEQ ID
rat liver HNF1


NO: 488)



LRRQKRFK (SEQ ID NO: 489)
rat HNF-3β


QQH3SH4Q (SEQ ID NO: 490)



LRRQKRFK (SEQ ID NO: 491)
rat HNF-3γ


LRRQKRFK (SEQ ID NO: 492)
rat HNF-3α






rat DBP a protein factor that binds to the D site of the albumin gene promoter






rat AT-BP1. Highly acidic domain. Two zinc fingers. Binds to the B-domain of α1-antitrypsin gene promoter and to the NF-κB site in the MHC gene enhancer.


DRRVRKGKV (SEQ ID
A 19 kD Drosophila melanogaster nonhistone associated with


NO: 496)
heterochromatin.


SKHGRRARRLDP (SEQ ID
murine EBF (early B-cell factor) of 591 aa. Regulates the pre-B and


NO: 497)
B lymphocyte-specific mb-1 gene. Expressed in pre-B and B-cell



lines but not in plasmocytomas, T-cell and nonlymphoid cell lines.


GRRTRRE (SEQ ID NO: 498)
human Sp1






yeast SNF2, a transcriptional regulator of many genes.


Group θxθθxθ







mouse AGP/EBP (87% similarity to C/EBP), ubiquitously expressed






rat LAP, a 32-kD liver-enriched transcriptional activator, also present in lung, with 71% sequence similarity to C/EBP. Leucine zipper. Accumulates to maximal levels around birth.






Ig/EBP-1 (immunoglobulin gene enhancer-binding protein). Forms heterodimers with C/EBP.






mouse c-Myb


DYYKVKRPKTD (SEQ ID
Drosophila eyes absent protein (760 aa), a nuclear protein that


NO: 512)
functions in early development to prevent programmed cell death and


GRARGRRHQ (SEQ ID
to allow the event that generate the eye to proceed. Mutations cause


NO: 513)
programmed cell death of eye progenitor cells.


FRYRKIKDIY (SEQ ID



NO: 514)



Group θxθxθθ



AKAKAKKA (SEQ ID NO: 515)
rat IL-6DBP interacting with interleukin-6 responsive elements. Has



a leucine zipper domain.


DKRQRNRC (SEQ ID NO: 516)
mouse H-2RIIBP (MHC class I genes H-2 region II binding protein).


FkrtirkD
Member of the nuclear hormone receptor superfamily.


FkrtirkD
chicken RXR, related to RAR (retinoic acid receptor), a nuclear


DKRQRNRC (SEQ ID NO: 517)
protein factor from the thyroid/steroid hormone receptor family






human NF-IL6 (345 aa). Specifically binds to IL1-responsive  element in the IL-6 gene. Leucine zipper. Homology to C/EBP.  


QKKNRNKC (SEQ ID NO: 521)
mouse PPAR (peroxisome proliferator activated receptor)


Group θθθxxθθ



EQIRKLVKKHG (SEQ ID
yeast RAP1


NO: 522)
It binds regulatory sites at yeast mating type silencers.


FRRSMKRKA (SEQ ID
human vitamin D receptor (427 aa)


NO: 523)



Group θθxxθθ



LKRHQRRH (SEQ ID NO: 524)
mouse WT1 (the murine homolog of human Wilms' tumor



predisposition gene WT1)


LKRHQRRH (SEQ ID NO: 525)
human WT33 (Wilms' tumor predisposition)


Group θθθxxθ







yeast SWI3 99 kD, highly acidic protein. Global transcription activator.


EVLKVQKRRIYD (SEQ ID
human RBAP-1 (retinoblastoma-associated protein 1) factor (412 aa).


NO: 527)
A protein that binds to the pocket (functional domain) of the



retinoblastoma (RB) protein involved in suppression of cell growth



(tumor suppressor). The transcription factor E2F, implicated in cell



growth, binds to the same pocket of RB.
















TABLE 10







NLS in other nuclear proteins








Putative NLS
Protein





YKSKKKA (SEQ ID NO: 528)
Yeast L3


TKKLPRKT (SEQ ID NO: 529)



TRKKGGRRGRRL (SEQ ID NO: 530)
Yeast 59 ribosomal protein


C-terminus



ARATRRKRCKG (SEQ ID NO: 531)
Yeast L16 ribosomal protein


GKGKYRNRRW (SEQ ID NO: 532)
yeast L2 ribosomal protein (homologous to



Xenopus L1). Encoded by intronless genes.






Xenopus laevis L1 ribosomal protein (homologous to yeast L2) Encoded by intronless genes.


ERKRKS (SEQ ID NO: 539)
human S6 ribosomal protein (homologous to yeast


GKRPRTKA (SEQ ID NO: 540)
S10)


HKRRRI (SEQ ID NO: 541)



LKKQRTKKNKE (SEQ ID NO: 542)



PKMRRRTYR (SEQ ID NO: 543)
Rat L17 ribosomal protein (184 aas)


KKKISQKKLKK (SEQ ID NO: 544)



YMRRRTYRA (SEQ ID NO: 545)
Podocoryne carnea (hydrozoan, Coelenteratum)


EVKKVSKKKL (SEQ ID NO: 546)
L17 ribosomal protein (184 aas) highly



homologous to rat L17.






human, rat ribosomal S13 protein


ERKRKS (SEQ ID NO: 548)
yeast S10 ribosomal protein (homologous to human


QRLQRKRH (SEQ ID NO: 549)
S6)


IRKRRA (SEQ ID NO: 550)



GRRRKKHRSRSRSRERRSRSRDRGRG12GRER
35 kD subunit of U2 small nuclear


DRRRSRDRER (SEQ ID NO: 551)
ribonucleoprotein auxiliary factor (U2AF), an



essential mammalian splicing factor. U2AF35



interacts with the 65 kD subunit (U2AF65). Both



proteins are concentrated in a small number of



subnuclear organelles, the coiled bodies.






human UsnRNP-associated 70 k protein (437 aas) that is phosphorylated at Arg/Ser-rich domains; involved in splicing


QKRNNKKSKKKRCAE (SEQ ID NO: 558)
yeast TRM1 enzyme for the N2,N2-


EKLRKLKI (near C-terminus) (SEQ ID NO: 559)
dimethylguanosine modification of both



mitochondrial and cytoplasmic tRNAs. TRM1 is



both nuclear and mitochondrial. The first motif is



within a region (70-213 aa segment) known to



cause nuclear localization of β-galactosidase.


NKRKRV (SEQ ID NO: 560)
Yeast nucleoporin NUP1 (1076 aa, 113 kD); an


SLKNRSNRKRE (SEQ ID NO: 561)
integral component of the pore complex. Involved


EPKRKRRLP (SEQ ID NO: 562)
in both binding and translocation steps of nuclear


ARMRHSKR (C-terminus) (SEQ ID NO: 563)
import.


KAEKEx3KVD2E2 (SEQ ID NO: 564)
Chicken, Xenopus No 38 nucleolar (38 kD);


Kx3Kx5Kx3R (SEQ ID NO: 565)
involved in intranuclear packaging of preribosomal



particles. Shuttles between nucleus and cytoplasm.


KTEREAEKALEEKx7R (SEQ ID NO: 566)
Chicken, hamster nucleolin (92 kD). Binds


Kx5Kx7Kx4RX3EDTTEETLR (SEQ ID NO: 567)
preribosomal RNA. Shuttles between nucleus and


RG2RG2RG3RG2FG2RG3RGFG2RG3FRG2RG4
cytoplasm.


DHKPQGKKIKFE (SEQ ID NO: 568)



(C-terminus)



WYKHFKKTKD (SEQ ID NO: 569)
human SATB1 (763 aa) which binds selectively to



AT-rich MARs with mixed



A, T, C on one strand excluding G. Binds to minor



groove with little contact with bases.






yeast CBF5p, a centromere-binding protein (55 kDa, 483 aa). The KKE repeat at its C-terminus occurs in microtubule-binding domains; yeast cells containing only three copies of the KKE repeat of CBF5p delay at G2/M; depletion of CBE5p arrests



cells at G1/S.


TKKKSFKL (SEQ ID NO: 574)
yeast CCE1, a cruciform cutting endonuclease


KSERERMLRESLKEERRRF (SEQ ID NO: 575)
rat nucleoporin 155 or Nup155 (1390 aas, 155



kDa), a protein of the nuclear pore complex;



contains 46 consensus sites for various kinases;



associated with both the nucleoplasmic and the



cytoplasmic region of pores.


PKKGSKKA (SEQ ID NO: 576)
human H2B variant differentially expressed during


DGKKRKRSRKES (SEQ ID NO: 577)
the cell cycle


GAKRHRKVLRD (SEQ ID NO: 578)
Calf thymus histone H4


14-24
(102 aa)


PAIRRLARRG (SEQ ID NO: 579)



32-41



EHARRKT (SEQ ID NO: 580)



74-80



ARRIRGERA 127-135 (SEQ ID NO: 581)
Calf thymus H3



(135 aa)


GSHHKAKGK 121-129 (SEQ ID NO: 582)
Calf thymus H2A



(129 aa)


RGKSGKARTKAKSRSSR 3-19 (SEQ ID
Sea urchin Psammechinus miliaris H2A (123 aa)


NO: 583)



PKKGSKKA 10-17 (SEQ ID NO: 584)
Calf thymus H2B


QKKDGKKRKRSRKES 22-36 (SEQ ID NO: 585)
(125 aa)


GGKKRHRKRKGSY (SEQ ID NO: 586)
Sea urchin Psammechinus miliaris H2B (122 aa)


22-34



PRTDKKRRRKRKES 19-32 (SEQ ID NO: 587)
Starfish H2B



(121 aa)


PAKAPKKKA 12-20 (SEQ ID NO: 588)
Trout testis H1


EAKKPAKKA 104-112 (SEQ ID NO: 589)
(194 aa)


AKKPKKV 128-134 (SEQ ID NO: 590)



AKKSPKKAKKP 142-152 (SEQ ID NO: 591)



PKKVKKP 183-189 (SEQ ID NO: 592)



PRRKAKRA 30-37 (SEQ ID NO: 593)
Sea urchin Parechinus angulosus sperm H1 (248


PKKAKKT 119-125 (SEQ ID NO: 594)
aa)


AKAKKAKA 129-136 (SEQ ID NO: 595)



AKKARKAKA 139-147 (SEQ ID NO: 596)



AKKAKKPKKKA 171-181 (SEQ ID NO: 597)



AKKAKKPAKK 182-191 (SEQ ID NO: 598)



SPKKAKKP 192-199 (SEQ ID NO: 599)



AKKSPKKKKAKRS 200-212 (SEQ ID NO: 600)



PKKAKKA 213-219 (SEQ ID NO: 601)



AKKAKKS 227-233 (SEQ ID NO: 602)



PRKAGKRRSPKKARK 234-248 (SEQ ID



NO: 603)



ARRRKTA 1-7 (SEQ ID NO: 604)
Annelid sperm H1a


IRKFIRKA 55-61 (SEQ ID NO: 605)
(119 aa)


PKKKKA 83-88 (SEQ ID NO: 606)



AKKPKAKKVKKP 89-100 (SEQ ID NO: 607)



AKKKTNRARKPKTKKNR 104-120 (SEQ ID



NO: 608)



PKRKVSS 1-7 (SEQ ID NO: 609)
Calf thymus HMG14


EEPKRRSARLS 14-24 (SEQ ID NO: 610)
(100 aa)


PKRKAEGDAK 1-10 (SEQ ID NO: 611)
Calf thymus HMG17


PKGKKGKA 52-59 (SEQ ID NO: 612)
(89 aa; 9,247 D)


PKKPRGKM (SEQ ID NO: 613)
Calf thymus HMG 1


EHKKKHP (SEQ ID NO: 614)
(259 aa)


ETKKKFKDP (SEQ ID NO: 615)



EKSKKKK(E/D)41 (SEQ ID NO: 616)



E3G2KKKKKFAK (SEQ ID NO: 617)



EHKKKHP (SEQ ID NO: 618)
Calf thymus HMG 2


PKGDKKGKKKDP (SEQ ID NO: 619)
(256 aa)


E4G3KKKKKFAK (SEQ ID NO: 620)



PKRKSATKGDEPARR 1-15 (SEQ ID NO: 621)
Trout testis H6 (60 aa)


KPKKAAAPKKA 30-34 (SEQ ID NO: 622)









References
U.S. Patent Documents


    U.S. Pat. No. 4,394,448 July, 1983 Szoka, Jr. et al.
    U.S. Pat. No. 4,598,051 July, 1986 Papahadjopoulos et al.
    U.S. Pat. No. 5,013,556 May, 1991 Woodle et al.

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## Claims

1. A method for producing micelles with negatively charged entrapped therapeutic agents, comprising:
a) combining an effective amount of a negatively charged therapeutic agent with a buffer solution containing about 20% to about 80% ethanol and an effective amount of a cationic lipid in a ratio where about 30% to about 90% the negatively charged atoms on the therapeutic agents are neutralized by positive charges on the cationic lipids to form an electrostatic micelle complex; and
b) combining the electrostatic micelle complex of step a) with an effective amount of a fusogenic-karyophilic peptide conjugate in a ratio wherein the negatively charged therapeutic agents are almost completely neutralized by a majority of the cationic lipids and fusogenic-karyophilic peptide conjugates, thereby producing micelles with entrapped therapeutic agents.

2. The method of claim 1, further comprising combining an effective amount of an anionic lipid in step b) when the total of the positive charges contributed by the cationic lipids exceed the total of negative charges contributed by the therapeutic agents.

3. The method of claim 1, further comprising combining an effective amount of a DNA condensing agent selected from the group consisting of spermine, spermidine, polylysine, polyarginine, polyhistidine, polyornithine and magnesium or a divalent metal ion.

4. A method for producing liposome encapsulated micelles with negatively charged polynucleotides, comprising:
a) combining an effective amount of a negatively charged polynucleotide with a buffer solution containing about 20% to about 80% ethanol and an effective amount of a cationic lipid in a ratio where about 30% to about 90% the negatively charged atoms on the negatively charged polynucleotides are neutralized by positive charges on the cationic lipids to form an electrostatic micelle complex; and
b) combining the electrostatic micelle complex of step a) with an effective amount of a fusogenic-karyophilic peptide conjugate and an effective amount of an encapsulating lipid solution in a ratio wherein the negatively charged polynucleotides are almost completely neutralized by a majority of the cationic lipids and fusogenic-karyophilic peptide conjugates and liposomes, thereby producing said liposome encapsulated micelles.

5. The method of claim 4, wherein the encapsulating lipid solution comprises a liposome.

6. The method of claim 5, wherein the liposome comprises vesicle-forming lipids and between about 1 to about 7 mole percent of distearoylphosphatidyl ethanolamine (DSPE) derivatized with an effective amount of polyethyleneglycol.

7. The method of claim 4, wherein at least one lipid in step a or step b is chosen from the group consisting of: cholesterol, phosphatidycholine (PC), phosphatidyethanolamine (PE), phosphatidylinositol (PI), sphingomyelin (SM), dioleoylphosphatidylethanolamine (DOPE), hydrogenated soy phosphatidylcholine (HSPC), lecithin, phosphatidylethanolamine, lysolecithin, lysophosphatidylethanolamine phosphatidylserine, phosphatidylinositol, sphingomyelin, cephalin, cardiolipin, phosphatidic acid, cerebrosides, distearoylphosphatidylethanolamine (DSPE), dioleoylphophatidycholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), palmitoyloleoylphosphatidylcholine (POPC), palmitoyloleoylphophatidylethanolamine (POPE), dioleoylphophatidylethanolamine-4-(N-maleimido-methyl) cyclohexane-1-carboxylate (DOPE-mal), stearylamine, dodecylamine, hexadecylamine, isopropyl myristate, triethanolamine-lauryl sulfate, alkyl-aryl sulfate, acetyl palmitate, glycerol ricinoleate, hexadecyl stereate, amphoteric acrylic polymers, polyethyloxylated fatty acid amides, dipalmitoylphosphatidylglycerol (DPPG), dioleoylphosphatidylglycerol and (DOPG), and PEG-DSPE.

8. A micelle with an entrapped therapeutic agent produced by the method comprising
a) combining an effective amount of a negatively charged therapeutic agent with a buffer solution containing about 20% to about 80% ethanol and an effective amount of a cationic lipid in a ratio where about 30% to about 90% the negatively charged atoms on the therapeutic agents are neutralized by positive charges on the cationic lipids to form an electrostatic micelle complex; and
b) combining the electrostatic micelle complex of step a) with an effective amount of a fusogenic-karyophilic peptide conjugate in a ratio wherein the negatively charged therapeutic agents are almost completely neutralized by a majority of the cationic lipids and fusogenic-karyophilic peptide conjugates, thereby producing micelles with entrapped therapeutic agents.

9. The micelle of claim 8, wherein the method further comprises combining an effective amount of an anionic lipid in step b) when the total of the positive charges contributed by the cationic lipids exceed the total of negative charges contributed by the therapeutic agents.

10. The micelle of claim 9, wherein the method further comprises combining an effective amount of a DNA condensing agent selected from the group consisting of spermine, spermidine, polylysine, polyarginine, polyhistidine, polyornithine and magnesium or a divalent metal ion.

11. A liposome encapsulated therapeutic agent produced by a method comprising:
a) combining an effective amount of a negatively charged therapeutic agent with a buffer solution containing about 20% to about 80% ethanol and an effective amount of a cationic lipid in a ratio where about 30% to about 90% the negatively charged atoms on the therapeutic agents are neutralized by positive charges on the cationic lipids to form an electrostatic micelle complex; and
b) combining the electrostatic micelle complex of step a) with an effective amount of a fusogenic-karyophilic peptide conjugate and an effective amount of an encapsulating lipid solution in a ratio wherein the negatively charged therapeutic agents are almost completely neutralized by a majority of the cationic lipids and fusogenic-karyophilic peptide conjugates and liposomes, thereby producing said liposome encapsulated micelles.