# Patent

## Title
Method for the recombinant expression of a polypeptide

## Abstract

A method for the recombinant production of a heterologous polypeptide in a eukaryotic host cell is described. The host cell comprises an expression plasmid, whereby the expression plasmid comprises in a 5′ to 3′ direction a) a promoter, b) a nucleic acid encoding a first polypeptide, whose amino acid sequence is selected from Table 1 depending on the first two amino acids of the second polypeptide, c) a nucleic acid encoding a second polypeptide comprising a nucleic acid encoding a heterologous polypeptide, a nucleic acid encoding a linker, and a nucleic acid encoding an immunoglobulin fragment, and d) a 3′ untranslated region comprising a polyadenylation signal. Further a plasmid and a kit are described.

## Background
RELATED CASES
This application claims priority from EP05023003.6, filed Oct. 21, 2005, and EP0601066.5, filed May 24, 2006, both incorporated herein by reference
FIELD OF THE INVENTION
The present invention relates to a method for the recombinant expression of a polypeptide in eukaryotic cells.
BACKGROUND OF THE INVENTION
Expression systems for the production of recombinant polypeptides are well-known in the state of the art and are described by, e.g., Marino, M. H., Biopharm. 2 (1989) 18-33; Goeddel, D. V., et al., Methods Enzymol. 185 (1990) 3-7; Wurm, F., and Bernard, A., Curr. Opin. Biotechnol. 10 (1999) 156-59. Polypeptides for use in pharmaceutical applications are preferably produced in mammalian cells such as CHO cells, NS0 cells, Sp2/0 cells, COS cells, HEK cells, BHK cells and the like. The essential elements of an expression plasmid are a prokaryotic plasmid propagation unit, for example for E. coli, comprising an origin of replication and a selection marker, an eukaryotic selection marker, and one or more expression cassettes for the expression of the structural gene(s) of interest each comprising a promoter, a structural gene, and a transcription terminator including a polyadenylation signal. For transient expression in mammalian cells, a mammalian origin of replication such as the SV40 Ori or OriP can be included. As promoter, a constitutive or inducible promoter can be selected. For optimized transcription, a Kozak sequence may be included in the 5′ untranslated region. For mRNA processing, in particular mRNA splicing and transcription termination, mRNA splicing signals, depending on the organization of the structural gene (exon/intron organization), may be included as well as a polyadenylation signal.
Expression of a gene is performed either as transient or as permanent expression. The polypeptide(s) of interest are in general secreted polypeptides, and therefore contain an N-terminal extension (also known as the signal sequence) which is necessary for the transport/secretion of the polypeptide through the cell into the extracellular medium.
In general, the signal sequence can be derived from any gene encoding a secreted polypeptide. If a heterologous signal sequence is used, it preferably is one that is recognized and processed (i.e. cleaved by a signal peptidase) by the host cell. For secretion in yeast, for example, the native signal sequence of a heterologous gene to be expressed may be substituted by a homologous yeast signal sequence derived from a secreted gene, such as the yeast invertase signal sequence, alpha-factor leader (including Saccharomyces, Kluyveromyces, Pichia, and Hansenula α-factor leaders, the second described in U.S. Pat. No. 5,010,182), acid phosphatase signal sequence, or the C. albicans glucoamylase signal sequence (EP 0 362 179). In mammalian cell expression, the native signal sequence of the protein of interest is satisfactory, although other mammalian signal sequences may be suitable, such as signal sequences from secreted polypeptides of the same or related species, e.g. for immunoglobulins from human or murine origin, as well as viral secretory signal sequences, for example, the herpes simplex glycoprotein D signal sequence. The DNA fragment encoding for such a presegment is ligated in frame to the DNA fragment encoding a polypeptide of interest.
In WO 98/28427 a genetically or chemically prepared fusion protein comprising the Fc immunoglobulin region, a derivative or analog fused to the N-terminal portion of the OB protein is reported. A chimeric molecule, i.e. antibody fusion or fusion protein, comprising a carboxy terminal protein import sequence and an amino terminal cargo region is presented in WO 03/035892.
In US 2003/0049227 a method for the induction of a cytocidal immune response against a tumor in a mammal by administering an immunocytokine, which is a fusion protein comprising an amino-terminal immunoglobulin part and a carboxy-terminal cytokine part, is reported.
WO 91/16437 reports a soluble recombinant fused protein which is stable in the mammalian circulatory system comprising a polypeptide which contains a recognition site for a target molecule, such as a complement receptor site, and is joined to the N-terminal end of an immunoglobulin chain. A fusion protein made up of an antibody and a peptide having a biological activity is reported in US 2003/0103984.
In US 2004/0033511 an antibody-cytokine fusion protein and in US 2004/0180035 an antibody-cytokine immunoconjugate are reported. An immunotoxin comprising Gelonin and an antibody is reported in WO 94/26910.
SUMMARY OF THE INVENTION
The current invention comprises a method for the recombinant production of a heterologous polypeptide in a eukaryotic host cell comprising an expression plasmid, whereby the expression plasmid comprises in a 5′ to 3′ direction a) a promoter, b) a nucleic acid encoding a first polypeptide, whose amino acid sequence is selected from Table 1 depending on the first two amino acids of the second polypeptide, c) a nucleic acid encoding a second polypeptide comprising a nucleic acid encoding the heterologous polypeptide, a nucleic acid encoding a linker, and a nucleic acid encoding an immunoglobulin fragment, and d) a 3′ untranslated region comprising a polyadenylation signal. The method further comprises cultivating the eukaryotic host cell comprising said expression plasmid under conditions suitable for the expression of the second polypeptide, and recovering the second polypeptide from the culture medium.
In one embodiment of the invention the nucleic acid encoding the second polypeptide contains in 5′ position to the nucleic acid encoding the heterologous polypeptide an additional nucleic acid encoding either a single amino acid or a dipeptide or the peptide of the amino acid sequence QIWNN (SEQ ID NO: 472) or a fragment thereof.
In another embodiment the immunoglobulin fragment is obtained either from an IgG or from an IgE.
In a further embodiment the eukaryotic cell is a mammalian cell, especially a CHO cell, NS0 cell, Sp2/0 cell, COS cell, K562 cell, BHK cell, PER.C6 cell or HEK cell.
In still another embodiment the linker is a peptide or polypeptide selected from the group consisting of SEQ ID NOs: 06, 07, 08, 09, 10, 139, 140, 554, 555, 556, and 557.
In another embodiment the immunoglobulin fragment comprises the carboxy-terminal constant domain of a heavy or light chain of a naturally occurring or synthetic immunoglobulin, i.e. either the CH1-, the hinge region, the CH2-, the CH3-domain of a heavy chain or the CL-domain of a light chain. Additionally the immunoglobulin fragment comprises a variable domain fragment.
In another embodiment the variable domain fragment is a variable domain of an immunoglobulin heavy or light chain in which of from one to six amino acids of the variable domain are deleted.
In a further embodiment of from one to six regions (FR1, FR2, FR3, CDR1, CDR2, CDR3) of the variable domain are deleted.
In a further embodiment the variable domain is deleted.
In another embodiment the immunoglobulin fragment is derived from a naturally occurring immunoglobulin or a variant thereof.
In a further embodiment the immunoglobulin fragment is derived from an at least partially synthetic immunoglobulin.
In still another embodiment of the invention the amino acid sequence of the heterologous polypeptide is of from 5 to 500 amino acid residues, more preferred of from 10 to 350 amino acid residues, most preferred of from 15 to 150 amino acid residues.
The invention further comprises a plasmid comprising in a 5′ to 3′ direction a) a promoter, b) a nucleic acid encoding a first polypeptide, whose amino acid sequence is selected from Table 1 depending on the first two amino acids of the second polypeptide, c) a nucleic acid encoding a second polypeptide comprising a nucleic acid encoding a heterologous polypeptide, a nucleic acid encoding a linker, and a nucleic acid encoding an immunoglobulin fragment, and d) a 3′-untranslated region comprising a polyadenylation signal.
The invention still further comprises a kit for the preparation of a plasmid for the expression of a heterologous polypeptide in a eukaryotic cell comprising a plasmid which comprises in a 5′ to 3′ direction a) a promoter, b) a nucleic acid encoding a first polypeptide, whose amino acid sequence is selected from the group consisting of SEQ ID NO: 36, 37, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, and 329, c) a nucleic acid encoding a second polypeptide comprising i) a nucleic acid encoding a peptide of the amino acid sequence QIWNN (SEQ ID NO: 472) or a N-terminal fraction thereof, ii) a cloning site comprising at least one restriction cleavage site suitable for the insertion of a nucleic acid encoding a heterologous polypeptide, iii) a nucleic acid encoding a linker selected from the group consisting of SEQ ID NOs 06, 07, 08, 09, 10, 139, 140, 554, 555, 556, and 557, and iv) a nucleic acid encoding an immunoglobulin fragment, and d) a 3′-untranslated region comprising a polyadenylation signal.
DETAILED DESCRIPTION OF THE INVENTION
The current invention comprises a method for the recombinant expression of a heterologous polypeptide of interest in an eukaryotic host cell comprising an expression vector, which contains a suitable promoter, a transcription terminator, a selectable marker, a nucleic acid sequence encoding a polypeptide, and a nucleic acid sequence encoding a signal sequence, whereby the nucleic acid sequence encoding the signal sequence is selected from Table 1 depending on the first two amino acids of the following polypeptide. The nucleic acid sequence encoding the heterologous polypeptide starts within fifteen nucleotides after the end of the nucleic acid sequence encoding the signal sequence. The nucleic acid sequence encoding the heterologous polypeptide can either be inserted within a FR1-region of an immunoglobulin, within a VL-region of an immunoglobulin or within the first constant domain of an immunoglobulin or it can replace all or a fraction of a FR1-region of an immunoglobulin, a VL-region of an immunoglobulin or the first constant domain of an immunoglobulin.
Within the scope of the present invention some of the terms used are defined as follows:
A “nucleic acid molecule” as used herein, refers to a naturally occurring or partially or fully non-naturally occurring nucleic acid encoding a polypeptide which can be produced recombinantly. The nucleic acid molecule can be build up of DNA-fragments which are either isolated or synthesized by chemical means. The nucleic acid molecule can be integrated into another nucleic acid, e.g. in an expression plasmid or the genome/chromosome of a eukaryotic host cell. Plasmid includes shuttle and expression vectors. Typically, the plasmid will also comprise a prokaryotic propagation unit comprising an origin of replication (e.g. the ColE1 origin of replication) and a selectable marker (e.g. ampicillin or tetracycline resistance gene), for replication and selection, respectively, of the vector in bacteria.
An “expression cassette” refers to a nucleic acid sequence that contains the elements necessary for expression and secretion of at least the contained structural gene in a cell.
A nucleic acid molecule is likewise characterized by its nucleic acid sequence consisting of individual nucleotides or/and by an amino acid sequence encoded by the nucleic acid molecule.
A “gene” denotes a segment e.g. on a chromosome or on a plasmid which is necessary for the expression of a peptide, polypeptide or protein. Beside the coding region the gene comprises other functional elements including a promoter, introns, and terminators.
A “structural gene” denotes the coding region of a gene without a signal sequence.
A “resistance gene” or a “selectable marker”, which is used interchangeably within this application, is a gene that allows cells carrying the gene to be specifically selected for or against, in the presence of a corresponding selection agent. A useful positive resistance gene is an antibiotic resistance gene. This selectable marker allows the host cell transformed with the gene to be positively selected for in the presence of the corresponding antibiotic; a non-transformed host cell would not be capable to grow or survive under the selective culture conditions. Selectable markers can be positive, negative or bifunctional. Positive selectable markers allow selection for cells carrying the marker, whereas negative selectable markers allow cells carrying the marker to be selectively eliminated. Typically, a selectable marker will confer resistance to a drug or compensate for a metabolic or catabolic defect in the host cell. Resistance genes useful with eukaryotic cells include, e.g., the genes for aminoglycoside phosphotransferase (APH), such as the hygromycin phosphotransferase (hyg), neomycin and G418 APH, dihydrofolate reductase (DHFR), thymidine kinase (tk), glutamine synthetase (GS), asparagine synthetase, tryptophan synthetase (indole), histidinol dehydrogenase (histidinol D), and genes encoding resistance to puromycin, bleomycin, phleomycin, chloramphenicol, Zeocin, and mycophenolic acid. Further marker genes are described in WO 92/08796 and WO 94/28143.
“Regulatory elements” as used herein, refer to nucleotide sequences present in cis, necessary for transcription and/or translation of the gene comprising the nucleic acid sequence encoding a polypeptide of interest. The transcriptional regulatory elements normally comprise a promoter upstream of the structural gene sequence to be expressed, transcriptional initiation and termination sites, and a polyadenylation signal sequence. The term “transcriptional initiation site” refers to the nucleic acid base in the gene corresponding to the first nucleic acid incorporated into the primary transcript, i.e. the mRNA precursor; the transcriptional initiation site may overlap with the promoter sequence. The term “transcriptional termination site” refers to a nucleotide sequence normally represented at the 3′ end of a gene of interest to be transcribed, that causes RNA polymerase to terminate transcription. The polyadenylation signal sequence, or poly-A addition signal provides the signal for the cleavage at a specific site at the 3′ end of eukaryotic mRNA and the post-transcriptional addition in the nucleus of a sequence of about 100-200 adenine nucleotides (polyA tail) to the cleaved 3′ end. The polyadenylation signal sequence may include the consensus sequence AATAAA located at about 10-30 nucleotides upstream from the site of cleavage.
To produce a secreted polypeptide, the structural gene of interest includes a DNA segment that encodes a signal sequence/leader peptide. The signal sequence directs the newly synthesized polypeptide to and through the ER membrane where the polypeptide can be routed for secretion. The signal sequence is cleaved off by a signal peptidases during the protein crosses the ER membrane. As for the function of the signal sequence the recognition by the host cell's secretion machinery is essential. Therefore the used signal sequence has to be recognized by the host cell's proteins and enzymes of the secretion machinery.
Translational regulatory elements include a translational initiation (AUG) and stop codon (TAA, TAG or TGA). An internal ribosome entry site (IRES) can be included in some constructs.
A “promoter” refers to a polynucleotide sequence that controls transcription of a gene/structural gene or nucleic acid sequence to which it is operably linked. A promoter includes signals for RNA polymerase binding and transcription initiation. The promoters used will be functional in the cell type of the host cell in which expression of the selected sequence is contemplated. A large number of promoters including constitutive, inducible and repressible promoters from a variety of different sources, are well known in the art (and identified in databases such as GenBank) and are available as or within cloned polynucleotides (from, e.g., depositories such as ATCC as well as other commercial or individual sources). A “promoter” comprises a nucleotide sequence that directs the transcription of a structural gene. Typically, a promoter is located in the 5′ non-coding or untranslated region of a gene, proximal to the transcriptional start site of a structural gene. Sequence elements within promoters that function in the initiation of transcription are often characterized by consensus nucleotide sequences. These promoter elements include RNA polymerase binding sites, TATA sequences, CAAT sequences, differentiation-specific elements (DSEs; McGehee, R. E., et al., Mol. Endocrinol. 7 (1993) 551), cyclic AMP response elements (CREs), serum response elements (SREs; Treisman, R., Seminars in Cancer Biol. 1 (1990) 47), glucocorticoid response elements (GREs), and binding sites for other transcription factors, such as CRE/ATF (O'Reilly, M. A., et al., J. Biol. Chem. 267 (1992) 19938), AP2 (Ye, J., et al., J. Biol. Chem. 269 (1994) 25728), SP1, cAMP response element binding protein (CREB; Loeken, M. R., Gene Expr. 3 (1993) 253) and octamer factors (see, in general, Watson et al., eds., Molecular Biology of the Gene, 4th ed. (The Benjamin/Cummings Publishing Company, Inc. 1987), and Lemaigre, F. P. and Rousseau, G. G., Biochem. J. 303 (1994) 1-14). If a promoter is an inducible promoter, then the rate of transcription increases in response to an inducing agent. In contrast, the rate of transcription is not regulated by an inducing agent if the promoter is a constitutive promoter. Repressible promoters are also known. For example, the c-fos promoter is specifically activated upon binding of growth hormone to its receptor on the cell surface. Tetracycline (tet) regulated expression can be achieved by artificial hybrid promoters that consist e.g. of a CMV promoter followed by two Tet-operator sites. The Tet-repressor binds to the two Tet-operator sites and blocks transcription. Upon addition of the inducer tetracycline, Tet-repressor is released from the Tet-operator sites and transcription proceeds (Gossen, M. and Bujard, H., Proc Natl Acad Sci USA 89 (1992) 5547-5551). For other inducible promoters including metallothionein and heat shock promoters, see, e.g., Sambrook et al. (supra) and Gossen et al., Curr. Opin. Biotech. 5 (1994) 516-520. Among the eukaryotic promoters that have been identified as strong promoters for high-level expression are the SV40 early promoter, adenovirus major late promoter, mouse metallothionein-I promoter, Rous sarcoma virus long terminal repeat, Chinese hamster elongation factor 1 alpha (CHEF-1, see e.g. U.S. Pat. No. 5,888,809), human EF-1 alpha, ubiquitin, and human cytomegalovirus immediate early promoter (CMV IE).
The “promoter” can be constitutive or inducible. An enhancer (i.e., a cis-acting DNA element that acts on a promoter to increase transcription) may be necessary to function in conjunction with the promoter to increase the level of expression obtained with a promoter alone, and may be included as a transcriptional regulatory element. Often, the polynucleotide segment containing the promoter will include enhancer sequences as well (e.g., CMV or SV40).
An “enhancer”, as used herein, refers to a polynucleotide sequence that enhances transcription of a gene or coding sequence to which it is operably linked. Unlike promoters, enhancers are relatively orientation and position independent and have been found 5′ or 3′ (Lusky, M., et al., Mol. Cell. Bio., 3 (1983) 1108) to the transcription unit, within an intron (Banerji, J., et al., Cell, 33 (1983) 729) as well as within the coding sequence itself (Osborne, T. F., et al., Mol. Cell. Bio., 4 (1984) 1293). Therefore, enhancers may be placed upstream or downstream from the transcription initiation site or at considerable distances from the promoter, although in practice enhancers may overlap physically and functionally with promoters. A large number of enhancers, from a variety of different sources are well known in the art (and identified in databases such as GenBank) and available as or within cloned polynucleotide sequences (from, e.g., depositories such as the ATCC as well as other commercial or individual sources). A number of polynucleotides comprising promoter sequences (such as the commonly-used CMV promoter) also comprise enhancer sequences. For example, all of the strong promoters listed above may also contain strong enhancers (see e.g. Bendig, M. M., Genetic Engineering 7 (1988) 91-127).
An “internal ribosome entry site” or “IRES” describes a sequence which functionally promotes translation initiation independent from the gene 5′ of the IRES and allows two cistrons (open reading frames) to be translated from a single transcript in an animal cell. The IRES provides an independent ribosome entry site for translation of the open reading frame immediately downstream (downstream is used interchangeably herein with 3′) of it. Unlike bacterial mRNA which can be polycistronic, i.e. encode several different polypeptides that are translated sequentially from the mRNAs, most mRNAs of animal cells are monocistronic and code for the synthesis of only one protein. With a polycistronic transcript in a eukaryotic cell, translation would initiate from the 5′ most translation initiation site, terminate at the first stop codon, and the transcript would be released from the ribosome, resulting in the translation of only the first encoded polypeptide in the mRNA. In a eukaryotic cell, a polycistronic transcript having an IRES operably linked to the second or subsequent open reading frame in the transcript allows the sequential translation of that downstream open reading frame to produce the two or more polypeptides encoded by the same transcript. The use of IRES elements in vector construction has been previously described, see, e.g., Pelletier, J., et al., Nature 334 (1988) 320-325; Jang, S. K., et al., J. Virol. 63 (1989) 1651-1660; Davies, M. V., et al., J. Virol. 66 (1992) 1924-1932; Adam, M. A., et al. J. Virol. 65 (1991) 4985-4990; Morgan. R. A., et al. Nucl. Acids Res. 20 (1992) 1293-1299; Sugimoto, Y, et al. Biotechnology 12 (1994) 694-698; Ramesh, N., et al. Nucl. Acids Res. 24 (1996) 2697-2700; and Mosser, D. D. et al, Biotechniques 22 (1997) 150-152).
“Operably linked” refers to a juxtaposition of two or more components, wherein the components so described are in a relationship permitting them to function in their intended manner. For example, a promoter and/or enhancer are operably linked to a coding sequence, if it acts in cis to control or modulate the transcription of the linked sequence. Generally, but not necessarily, the DNA sequences that are “operably linked” are contiguous and, where necessary to join two protein encoding regions such as a secretory leader and a polypeptide, contiguous and in reading frame. However, although an operably linked promoter is generally located upstream of the coding sequence, it is not necessarily contiguous with it. Enhancers do not have to be contiguous. An enhancer is operably linked to a coding sequence if the enhancer increases transcription of the coding sequence. Operably linked enhancers can be located upstream, within or downstream of coding sequences and at considerable distance from the promoter. A polyadenylation site is operably linked to a coding sequence if it is located at the downstream end of the coding sequence such that transcription proceeds through the coding sequence into the polyadenylation sequence. Linking is accomplished by recombinant methods known in the art, e.g., using PCR methodology and/or by ligation at convenient restriction sites. If convenient restriction sites do not exist, then synthetic oligonucleotide adaptors or linkers are used in accord with conventional practice.
The term “expression” as used herein refers to transcription or translation occurring within a host cell. The level of transcription of a desired product in a host cell can be determined on the basis of the amount of corresponding mRNA that is present in the cell. For example, mRNA transcribed from a selected sequence can be quantitated by PCR or by Northern hybridization (see Sambrook et al., Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press (1989)). Protein encoded by a selected sequence can be quantitated by various methods, e.g. by ELISA, by assaying for the biological activity of the protein, or by employing assays that are independent of such activity, such as Western blotting or radioimmunoassay, using antibodies that recognize and bind to the protein (see Sambrook et al., 1989, supra).
A “host cell” refers to a cell into which the gene encoding the polypeptide of the invention is introduced. Host cell includes both prokaryotic cells used for propagation of the plasmids/vectors, and eukaryotic cells for expression of the structural gene. Typically, the eukaryotic cells are mammalian cells.
A “polypeptide” is a polymer of amino acid residues joined by peptide bonds, whether produced naturally or synthetically. Polypeptides of less than about 20 amino acid residues may be referred to as “peptides.” Polypeptides comprising one or more polypeptide chains or comprising an amino acid chain of a length of 100 amino acids or more may be referred to as “proteins”.
A “protein” is a macromolecule comprising one or more polypeptide chains whereby at least one chain has an amino acid length of 100 amino acids or more. A protein may also comprise non-peptidic components, such as carbohydrate groups. Carbohydrates and other non-peptidic substituents may be added to a protein by the cell in which the protein is produced, and may vary with the type of cell. Proteins are defined herein in terms of their amino acid backbone structures; additions such as carbohydrate groups are generally not specified, but may be present nonetheless.
“Heterologous DNA” or “heterologous polypeptide” refers to a DNA molecule or a polypeptide, or a population of DNA molecules or a population of polypeptides, that do not exist naturally within a given host cell. DNA molecules heterologous to a particular host cell may contain DNA derived from the host cell species (i.e. endogenous DNA) so long as that host DNA is combined with non-host DNA (i.e. exogenous DNA). For example, a DNA molecule containing a non-host DNA segment encoding a polypeptide operably linked to a host DNA segment comprising a promoter is considered to be a heterologous DNA molecule. Conversely, a heterologous DNA molecule can comprise an endogenous structural gene operably linked with an exogenous promoter.
A peptide or polypeptide encoded by a non-host DNA molecule is a “heterologous” peptide or polypeptide.
A “cloning vector” is a nucleic acid molecule, such as a plasmid, cosmid, phageimid or bacterial artificial chromosome (BAC), which has the capability of replicating autonomously in a host cell. Cloning vectors typically contain one or a small number of restriction endonuclease recognition sites that allow insertion of a nucleic acid molecule in a determinable fashion without loss of an essential biological function of the vector, as well as nucleotide sequences encoding a resistance gene that is suitable for use in the identification and selection of cells transformed with the cloning vector. Resistance genes typically include genes that provide tetracycline resistance or ampicillin resistance.
An “expression plasmid” is a nucleic acid molecule encoding a protein to be expressed in a host cell. Typically, an expression plasmid comprises a prokaryotic plasmid propagation unit, e.g. for E. coli, comprising an origin of replication, and a selection marker, an eukaryotic selection marker, and one or more expression cassettes for the expression of the structural gene(s) of interest comprising a promoter, a structural gene, and a transcription terminator including a polyadenylation signal. Gene expression is usually placed under the control of a promoter, and such a structural gene is said to be “operably linked to” the promoter. Similarly, a regulatory element and a core promoter are operably linked if the regulatory element modulates the activity of the core promoter.
A “polycistronic transcription unit” is a transcription unit in which more than one structural gene is under the control of the same promoter.
An “isolated polypeptide” is a polypeptide that is essentially free from contaminating cellular components, such as carbohydrate, lipid, or other proteinaceous impurities associated with the polypeptide in nature. Typically, a preparation of isolated polypeptide contains the polypeptide in a highly purified form, i.e. at least about 80% pure, at least about 90% pure, at least about 95% pure, greater than 95% pure, or greater than 99% pure. One way to show that a particular protein preparation contains an isolated polypeptide is by the appearance of a single band following sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis of the protein preparation and Coomassie Brilliant Blue staining of the gel. However, the term “isolated” does not exclude the presence of the same polypeptide in alternative physical forms, such as dimers or alternatively glycosylated or derivatized forms.
The term “immunoglobulin” refers to a protein consisting of one or more polypeptides substantially encoded by immunoglobulin genes. The recognized immunoglobulin genes include the different constant region genes as well as the myriad immunoglobulin variable region genes. Immunoglobulins may exist in a variety of formats, including, for example, Fv, Fab, and F(ab)2 as well as single chains (scFv) (e.g. Huston, J. S., et al., Proc Natl Acad Sci USA 85 (1988) 5879-5883; Bird, R. E., et al., Science 242 (1988) 423-426; and, in general, Hood et al., Immunology, Benjamin N.Y., 2nd edition (1984), and Hunkapiller, T., and Hood, L., Nature 323 (1986) 15-16).
An immunoglobulin in general comprises at least two light chain polypeptides and two heavy chain polypeptides. Each of the heavy and light polypeptide chains may contain a variable region (generally the amino terminal portion of the polypeptide chain) which contains a binding domain that is able to interact with an antigen. Each of the heavy and light polypeptide chains comprises a constant region (generally the carboxyl terminal portion). The constant region of the heavy chain mediates the binding of the antibody i) to cells bearing a Fc gamma receptor (FcγR), such as phagocytic cells, or ii) to cells bearing the neonatal Fc receptor (FcRn) also known as Brambell receptor. It also mediates the binding to some factors including factors of the classical complement system such as component (C1q).
The variable domain of an immunoglobulin's light or heavy chain in turn comprises different segments, i.e. four framework regions (FR) and three hypervariable regions (CDR).
An “immunoglobulin fragment” denotes a polypeptide comprising at least the constant domains of a chain of an immunoglobulin, i.e. CH1, hinge-region, CH2, and CH3 and optionally CH4 of a heavy chain of an immunoglobulin or CL of a light chain of an immunoglobulin. Also comprised are derivatives and variants thereof. Additionally a variable domain, in which one or more amino acids or amino acid regions are deleted, may be present. In a preferred embodiment the variable domain is deleted in the immunoglobulin fragment.
“Transcription terminator” as denoted within this application is a DNA sequence of 50-750 base pairs in length which gives the RNA polymerase the signal for termination of the mRNA synthesis. Very efficient (strong) terminators at the 3′ end of an expression cassette are advisable to prevent the RNA polymerase from reading through particularly when using strong promoters. Inefficient transcription terminators can lead to the formation of an operon-like mRNA which can be the reason for an undesired, e.g. plasmid-coded, gene expression.
The term “linker” as used within this application denotes peptide linkers of natural or synthetic origin. They are building up a linear amino acid chain. The chain has a length of from 1 to 50 amino acids, preferred between 3 and 25 amino acids. The linker may contain repetitive amino acid sequences or parts of naturally occurring polypeptides, such as polypeptides with a hinge-function.
“Synthetic linkers” are designated to be rich in glycine, glutamine and serine residues. These residues are arranged in a small peptide unit of up to five amino acids, such as GGGGS, QQQQG or SSSSG. The small peptide unit is repeated for two to five times to form a multimeric unit. At each of the amino- and/or carboxy-terminal end of the multimeric unit up to six additional amino acids can be added.
The term “biologically active molecule” as used herein refers to an organic molecule, e.g. a biological macromolecule such as a peptide, protein, glycoprotein, nucleoprotein, muco-protein, lipoprotein, synthetic polypeptide or protein, that causes a biological effect when administered in or to artificial biological systems, such as bioassays using cell lines and viruses, or in vivo an animal, including but not limited to birds and mammals, including humans. This biological effect can be but is not limited to enzyme inhibition or activation, binding to a receptor or a ligand, either at the binding site or circumferential, signal triggering or signal modulation.
Biologically active molecules are without limitation for example hormones, cytokines, growth factors, receptor ligands, agonists or antagonists, cytotoxic agents, antiviral agents, imaging agents, enzyme inhibitors, enzyme activators or enzyme activity modulators such as allosteric substances.
The term “amino acid” as used within this application comprises alanine (three letter code: ala, one letter code: A), arginine (arg, R), asparagine (asn, N), aspartic acid (asp, D), cysteine (cys, C), glutamine (gln, Q), glutamic acid (glu, E), glycine (gly, G), histidine (his, H), isoleucine (ile, I), leucine (leu, L), lysine (lys, K), methionine (met, M), phenylalanine (phe, F), proline (pro, P), serine (ser, S), threonine (thr, T), tryptophan (trp, W), tyrosine (tyr, Y), and valine (val, V).
Methods and techniques known to a person skilled in the art, which are useful for carrying out the current invention, are described e.g. in Ausubel, F. M., ed., Current Protocols in Molecular Biology, Volumes I to III (1997), Wiley and Sons; Sambrook et al., Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (1989).
The invention comprises a method for the recombinant production of a heterologous polypeptide in a eukaryotic host cell. The host cell comprises an expression plasmid, which comprises in 5′ to 3′ direction a) a promoter, b) a nucleic acid encoding a first polypeptide whose amino acid sequence is selected from Table 1 depending of the first two amino acids of the second polypeptide, c) a nucleic acid encoding a second polypeptide comprising a nucleic acid encoding a heterologous polypeptide having a biological activity, a nucleic acid encoding a peptide or polypeptide selected from the group consisting of SEQ ID NO: 06-10, 139, 140, and 554-557, a nucleic acid encoding an immunoglobulin fragment, and d) a 3′ untranslated region. This expression plasmid is introduced into a host cell which is cultivated under conditions suitable for the expression of the second polypeptide. The secreted second polypeptide is recovered from the culture medium.
The first polypeptide is a so-called signal sequence. The signal sequence is responsible for the secretion of the attached/succeeding/operably linked polypeptide. To be effective the signal sequence has to be recognized and processed by the proteins and enzymes within the cell expressing the polypeptide. In case of a eukaryotic host cell, the signal sequence is preferably a eukaryotic one. To assure that the second polypeptide according to the current invention is secreted correctly, the signal sequence is selected from human and murine immunoglobulin signal sequences. A compilation is shown in table 1.
Which signal sequence is selected depends on the succeeding amino acids. It has to be assured that the signal peptidase, which cleaves the signal sequence after the secretion process, recognizes the signal sequence of the secreted polypeptide and removes it. To provide a “natural” transition from the signal sequence to the heterologous polypeptide the signal sequence should be chosen that way, that the first two amino acids of the heterologous polypeptide are identical to the first two amino acids of the amino acid sequences of the naturally following immunoglobulin FR1-region.








TABLE 1







Set of the first two amino acids (given in one



letter code) of the second polypeptide assigned


to signal peptides (first polypeptide given in


one letter code).










second polypeptide
first peptide




starts with
(signal sequence)
SEQ ID


amino acids
amino acid sequence
NO:













AC
MEFQTQVLMSLLLCMS
163




MESQTQVLMFLLLWVS
164



MVSTPQFLVFLLFWIP
165


 


AD
MESQTLVFISILLWLY
166


 


AG
MSVPTQLLGLLLLWLT
167


 


AH
MKSQTQVFIFLLLCVS
168



MKSQTQVFVFLLLCVS
169


 


AI
MDMRVPAQLLGLLLLWLRGARC
68



MDMRVPAQLLGLLLLWLRGARC
69



MDMRVPAQLLGLLQLWLSGARC
70



MDMRVPAQLLGLLLLWLSGARC
71



MDMRVPAQLLGLLLLWLPDTRC
72



MDMRVPAQLLGLLLLWFPGARC
73



MDMRVPAQLLGLLLLWFPGARC
74



MDMRVLAQLLGLLLLCFPGARC
75



MDMRVLAQLLGLLLLCFPGARC
76



MDMRVPAQLLGLLLLWLPGARC
77



MDMRVPAQLLGLLLLWLPGARC
78



MDMRVPAQLLGLLLLWFPGSRC
79



MDMRVPAQLLGLLLLWFPGSRC
80



MDMRVPAQLLGLLLLWLPGARC
81



MDMRVPAQRLGLLLLWFPGARC
82



MRVPAQLLGLLLLWLPGARC
83



MDMRVPAQLLGLLLLWLPGARC
84



MDMRVPAQLLGLLLLWLPGARC
85



MDMRVPAQLLGLLLLWLPGAKC
86



MAWISLILSLLALSS
170



MAWTSLILSLLALCS
171



MRCLAEFLGLLVLWIP
172


 


AL
MGWNWIFILILSVTT
173


 


AQ
MRFQVQVLGLLLLWIS
174



MRPSIQFLGLLLFWLH
175


 


AR
MDIRAPAQFLGILLLWFP
176



MDMMVLAQFLAFLLLWFP
177



MDMRAPAQFLGILLLWFP
178



MDMRAPAQFLGILLLWFP
179



MDMRAPAQVFGFLLLWFP
180



MDMRASAQFHGILLLWFP
181



MDMRASAQFHGILLLWFP
182



MDMWTSAQFLGILLLWFL
183



MNTRAPAEFLGFLLLWFL
184



MRAPAPFLGLLLFCFL
185



MRTPAPFLGLLLFCFS
186



MSISTQLLGLLLLWLT
187



MSLPTQLQGLLLLWLT
188



MSVLTQVLALLLLWLT
189



MSVPTQLLALLLLWLT
190



MSVPTQVLGLLLLWLT
191



TDFHMQIFSFMLISFT
192


 


AS
MAWTSLILSLLALCS
193


 


AT
MRCLAEFLRLLVLWIP
194


 


CQ
MPWALLLLTLLTHSAVSVV
138


 


DA
MKLPVRLLVLMFWIPSSS
195


 


DI
MDMRVPAQLLGLLLLWLRGARC
68



MDMRVPAQLLGLLLLWLRGARC
69



MDMRVPAQLLGLLQLWLSGARC
70



MDMRVPAQLLGLLLLWLSGARC
71



MDMRVPAQLLGLLLLWLPDTRC
72



MDMRVPAQLLGLLLLWFPGARC
73



MDMRVPAQLLGLLLLWFPGARC
74



MDMRVLAQLLGLLLLCFPGARC
75



MDMRVLAQLLGLLLLCFPGARC
76



MDMRVPAQLLGLLLLWLPGARC
77



MDMRVPAQLLGLLLLWLPGARC
78



MDMRVPAQLLGLLLLWFPGSRC
79



MDMRVPAQLLGLLLLWFPGSRC
80



MDMRVPAQLLGLLLLWLPGARC
81



MDMRVPAQRLGLLLLWFPGARC
82



MRVPAQLLGLLLLWLPGARC
83



MDMRVPAQLLGLLLLWLPGARC
84



MDMRVPAQLLGLLLLWLPGARC
85



MDMRVPAQLLGLLLLWLPGAKC
86



MRLPAQLLGLLMLWVPGSSE
87



MRLPAQLLGLLMLWVPGSSE
88



MRLPAQLLGLLMLWVPGSSG
89



MRLPAQLLGLLMLWVPGSSG
90



MRLPAQLLGLLMLWIPGSSA
91



MRLPAQLLGLLMLWIPGSSA
92



MRLPAQLLGLLMLWVSGSSG
93



MRLPAQLLGLLMLWVSGSSG
94



MRLLAQLLGLLMLWVPGSSG
95



MVLQTQVFISLLLWISGAYG
103



MDIRAPAQFLGILLLWFPARC
196



MDMMVLAQFLAFLLLWFPARC
197



MDMRAPAQFFGILLLWFPIRC
198



MDMRAPAQFLGILLLWFPARC
199



MDMRAPAQIFGFLLLLFQTRC
200



MDMRAPAQVFGFLLLWFPARC
201



MDMRASAQFLGFLLLWFP
202



MDMRDPPQFLAFLLLWIP
203



MDMRTPAQFLGILLLWFPIKC
204



MDMRVPAHVFGFLLLWFPTRC
205



MDSQAQVLILLLLWVSTCG
206



MDSQAQVLMLLLLSVSTCG
207



MDSQAQVLMLLLLWVSTCG
208



MDSQARVLMLLLLWVSTCG
209



MEFQTQVFVFVLLWLSVDG
210



MEFQTQVLMSLLLCMSACA
211



MEKDTLLLWVLLLWVPSTG
212



MESDTLLLWVLLLWVPSTG
213



MESQIQAFVFVFLWLSVDG
214



MESQIQVFVFVFLWLSVDG
215



MESQNHVLMFLLLWVSTCG
473



MESQTHVLMFLLLWVSTCG
474



MESQTQVFVYMLLWLSVDG
475



MESQTQVLISLLFWVSTCG
476



MESQTQVLMFLLLWVSACA
477



MESQTQVLMSLLFWVSTCG
478



METDPLLLWVLLLWVPSTG
479



METDTILLWVLLLWVPSTG
480



METDTLLLWVLLLWVPSTG
481



METDTLLLWVLLLWVPSTG
482



METHSQVFVYMLLWLSVEG
483



MGFKMESHTQAFVFAFLWLSVDG
484



MGVPTQLLLLWLTVRC
485



MIASAQFLGLLLLCFQTRC
486



MKFPSQLLLFLLFRITIIC
487



MKFPSQLLLLLLFGIPMIC
488



MMSSAQFLGLLLLCFQTRC
489



MMSSAQFLGLLLLCFQTRY
490



MNMLTQLLGLLLLWFAGKC
491



MRCLAEFLGLLVLWIPAIG
492



MRCLAEFLRLLVLWIPATG
493



MRCSLQFLGVLMFWISVSG
494



MRFSAQLLGLLVLWIPSTA
495



MRPSIQFLGLLLFWLHAQC
496



MRVLAELLGLLLFCFLVRC
497



MRVLPEFLGLLLLWISVRC
498



MSISTQLLGLLLLWLTARC
499



MSVLTQVLALLLLWLTARC
500



MSVPTQLLALLLLWLTARC
501



MSVPTQLLGLLLLWLTAGC
502



MSVPTQVLGLLLLWLTARC
503



MVFTPQILGLMLFWISSTG
504



MVFTPQILGLMLFWISSRG
505



MVLGLKWVFFVVFYQSRG
506



MVSTSQLLGLLLFWTSSRG
507



PAQFLFLLVLWIQSRC
508


 


DR
MSLLTQLQGLLLLWLT
216


 


DV
MRLPAQLLGLLMLWVPGSSE
87



MRLPAQLLGLLMLWVPGSSE
88



MRLPAQLLGLLMLWVPGSSG
89



MRLPAQLLGLLMLWVPGSSG
90



MRLPAQLLGLLMLWIPGSSA
91



MRLPAQLLGLLMLWIPGSSA
92



MRLPAQLLGLLMLWVSGSSG
93



MRLPAQLLGLLMLWVSGSSG
94



MRLLAQLLGLLMLWVPGSSG
95



MLPSQLIGFLLLWVPASRG
105



MLPSQLIGFLLLWVPASRG
106



MVSPLQFLRLLLLWVPASRG
107



LILKVQC
217



LVLKVLC
218



MDMRASAQFHGILLLWFPARC
219



MKLPVLLVVLLLFTSPSSS
220



MKLPVRLLVLMFWIPSSS
221



MMSPAQFLFLLVLWIQTNG
222



MMSPAQFLFLLVLWIRTNG
223



MMSPVHSIFILLLWIVISG
224



MMSPVQFLFLLMLWIQTNG
225



MNFGLRLIFLVLTLKVQC
226



MNLPVHLLVLLLFWIPSRG
227



MNTRAPAEFLGFLLLWFLARC
228



MRFQVQVLGLLLLWISAQC
229



MRVLSLLYLLTAIPGILS
230


 


EI
M ETPAQLLFLLLLWLPDTTG
96



METPAQLLFLLLLWLPDTTG
97



MEAPAQLLFLLLLWLPDTTG
98



MEAPAQLLFLLLLWLPDTTG
99



MEAPAQLLFLLLLWLPDTTG
100



MEAPAQLLFLLLLWLTDTTG
101



MEPWKPQHSFFFLLLLWLPDTTG
102



MLPSQLIGFLLLWVPASRG
105



MLPSQLIGFLLLWVPASRG
106



MVSPLQFLRLLLLWVPASRG
107



MDFHVQIFSFMLISVTILSSG
231



MDFQMQIISLLLISVTIVSNG
232



MDFQVQIFSFLLISVTILTNG
233



MDMRAPAQFLGILLLWFPARC
234



MNFHVQIFSFMLISVTIGSSG
235



MTMLSLVLLLSFLLLCSRA
236



MVSTPQFLVFLLFWIPACG
237



TELICVFLFLLSVTAILSSG
238


 


EI
MDCGISLVFLVLILKVC
239


 


EM
MDMWVQIFSLLLICVTSKG
240


 


EN
LLISVTIMSRG
241



MDFQVQIFSFLLISASIMSRG
242



MDFQVQIFSFLLISISVMSRG
243



MDFQVQIFSFLLISVSIMSRG
244



MDLQVQIISFLLIIVTIMSRG
245


 


ET
MGSQVHLLSFLLLWISDTRA
104



MGEQRIRSCHATSGAESAR
246



MGSQVHLLSFLLLWISDTRA
247



MTMFSLALLLSLLLLCVSSRA
248



MTMLSLAPLLSLLLLSRA
249



MXTMDEHESGAVTPHQVLKSRA
250


 


EV
MDWTWRILFLVAAATGAHS
28



MDWTWRILFLVAAATGAHS
29



MDWTWRILFLVAAATSAHS
30



MDWTWSILFLVAAPTGAHS
31



MDCTWRILFLVAAATGTHA
32



MDWTWRILFLVAAATDAYS
33



MDWTWRVFCLLAVAPGAHS
34



MDWIWRILFLVGAATGAHS
35



MELGLSWVFLVAILEGVQC
38



MELGLSWIFLLAILKGVQC
39



MEFGLSWVFLVAIIKGVQC
40



MELGLSWVFLVAILEGVQC
41



MEFGLSWIFLAAILKGVQC
42



MEFGLSWVFLVAILKGVQC
43



MELGLRWVFLVAILEGVQC
44



MEFGLSWLFLVAILKGVQC
45



MEFGLSWVFLVALLRGVQC
46



MEFGLSWVFLVALLRGVQC
47



MEFGLSWVFLVAILKGVQC
48



MELGLCWVFLVAILEGVQC
49



MEFGLSWVFLVAILKGVQC
50



MEFWLSWVFLVAILKGVQC
51



MTEFGLSWVFLVAIFKGVQC
52



MEFGLSWVFLVAILKGVQC
53



MEFGLSWVFLVVILQGVQC
54



MEFGLSWVFLVAILKGVQC
55



MGSTAILALLLAVLQGVCS
64



MGSTAILGLLLAVLQGVCA
65



IKWSWIFLFLLSGTAVHS
251



IKWSWISLFLLSGTAVHS
252



LILKVQC
253



LVLKVQC
254



MAVVTGKGLPSPKLEVNS
255



MDFGLIFFIVALLKVQC
256



MDFGLSLVFLVLILKVQC
257



MDMRASAQFHGILLLWFPARC
258



MEWELSLIFIFALLKDVQC
259



MEWSCIFLFLLSVTAVHS
260



MEWSCIFLFLLSVTAIHS
261



MEWSWIFLFLLSGTAVLS
262



MGWNWIFILILSVTTALS
263



MGWSCIILFLVATATVHS
264



MGWNWIFILILSVTTVHS
265



MGWSCIMLFLAATATVHS
266



MGWSWIFFFLLSGTAVLS
267



MGWSWIFLFFLSGTAVLS
268



MGWSWIFLFLLSGSAVLS
269



MGWSWIFLFLLSGSAVHS
270



MGWSWIFLFLLSGTAVHS
271



MGWSWIFLFLLSGTAVLS
509



MGWSWIFLFLLSGTAVLS
510



MGWSWIFLLFLSGTAVLS
511



MGWSWIFLLFLSGTAVHS
512



MGWSWIFLLFLSGTAVLS
513



MGWSWVFLSFLSGTAVLS
514



MKCSWVIFFLMAVVIINS
515



MKLWLNWILLVALLNIQC
516



MLLGLKWVFFVVFYQVHC
517



MLLGLKWVFFVVFYQGVHC
518



MMVLSLLYLLTALPGILS
519



MNFGLSLIFLVLILKVQC
520



MQLGHLLPDGSVNS
521



MVSETHVLIFLLLWVSVHC
522



RSVPTQLLGLLLLWLTVNS
523


 


GH
MGWSYIILFLVATAT
272


 


GI
IDINVQIFRFLLISVTSSG
273


 


GK
MNMLTQLLGLLLLWFA
274


 


GR
MRTPAHFLGLLLLCFL
275


 


HV
MRWSCIILFLVATATVHS
276


 


IG
MNFHVQIFSFMLISVT
277


 


IH
MEWSCIFLFLLSVTA
278


 


II
MDFQVQIFQIPVKQCL
279



MDFQVQIFSFLLISAS
280



MKFPSQLLLFLLFRIT
281


 


IK
MDMRTPAQFLGILLLWFP
282


 


IL
MAVLALLFCLVTFPS
283



MDFHVQIFSFMLISVT
284



MDFQVQIFSFLLISAS
285



MDFQVQIFSFLLISR
286



MDFQVQIFSFLLISVT
287



TELICVFLFLLSVTA
288


 


IM
LLISVT
289



MDFQVQIFSFLLISAS
290



MDFQVQIFSFLLISVS
291



MDFQVQIFSFLLISVS
292



MDFQVQIFSFLLMSAS
293



MDLQVQIISFLLIIVT
294



MHFQVQIFSFLLISAS
295


 


IN
MKCSWVIFFLMAVVI
296


 


IQ
MKLWLNWILLVALLN
297


 


IR
MDMRAPAQFFGILLLWFP
298


 


IS
MIYSLQLLRMLVLWIP
299



MMSPVHSIFILLLWIV
300



MSYSLQLLRMLVLWIP
301


 


IT
MSYSLQLLRMLVLWIP
302


 


IV
MDFQMQIISLLLISVT
303


 


KN
MDFQVQIFQIPVKQCLIISRG
304


 


LM
MDFQVQIFSFLLISAS
305


 


LP
MAWVSFYLLPFIFSTGLCA
127



MAWTQLLLLFPLLLHWTGSLS
128



MAWTPLLFLTLLLHCTGSLS
129


 


LR
MRPTLSFLGSCCSSLI
306


 


MI
MKFPSQLLLLLLFGIP
307


 


NF
MAW AP LLLTLLAHCTGSWA
133


 


NI
MDMRVPAQLLGLLLLWLRGARC
68



MDMRVPAQLLGLLLLWLRGARC
69



MDMRVPAQLLGLLQLWLSGARC
70



MDMRVPAQLLGLLLLWLSGARC
71



MDMRVPAQLLGLLLLWLPDTRC
72



MDMRVPAQLLGLLLLWFPGARC
73



MDMRVPAQLLGLLLLWFPGARC
74



MDMRVLAQLLGLLLLCFPGARC
75



MDMRVLAQLLGLLLLCFPGARC
76



MDMRVPAQLLGLLLLWLPGARC
77



MDMRVPAQLLGLLLLWLPGARC
78



MDMRVPAQLLGLLLLWFPGSRC
79



MDMRVPAQLLGLLLLWFPGSRC
80



MDMRVPAQLLGLLLLWLPGARC
81



MDMRVPAQRLGLLLLWFPGARC
82



MRVPAQLLGLLLLWLPGARC
83



MDMRVPAQLLGLLLLWLPGARC
84



MDMRVPAQLLGLLLLWLPGARC
85



MDMRVPAQLLGLLLLWLPGAKC
86



MESDTLLLWVLLLWVPSTS
308



MESQTLVFISILLWLYADG
309



MESQTQVFLSLLLWVSTCG
310



METDTLLLWVLLLWVPSTG
311


 


PV
MGWSCIMLFLAATATVHS
312



MGWSCIMLFLAATATGVHS
313


 


QA
MD M RVP AQ LLGLLLLWLRGARC
68



MD M RVP AQ LLGLLLLWLRGARC
69



MD M RVP AQ LLGLLQLWLSGARC
70



MD M RVP AQ LLGLLLLWLSGARC
71



MD M RVP AQ LLGLLLLWLPDTRC
72



MD M RVP AQ LLGLLLLWFPGARC
73



MD M RVP AQ LLGLLLLWFPGARC
74



MD M RVL AQ LLGLLLLCFPGARC
75



MD M RVL AQ LLGLLLLCFPGARC
76



MD M RVP AQ LLGLLLLWLPGARC
77



MD M RVP AQ LLGLLLLWLPGARC
78



MD M RVP AQ LLGLLLLWFPGSRC
79



MD M RVP AQ LLGLLLLWFPGSRC
80



MD M RVP AQ LLGLLLLWLPGARC
81



MD M RVP AQ RLGLLLLWFPGARC
82



M RVP AQ LLGLLLLWLPGARC
83



MD M RVP AQ LLGLLLLWLPGARC
84



MD M RVP AQ LLGLLLLWLPGARC
85



MD M RVP AQ LLGLLLLWLPGAKC
86



MAW TP LLLLLLSHCTGSLS
130



MAW TP LLLLFLSHCTGSLS
131



MAW TL LLLVLLSHCTGSLS
132



MAW TP LFLFLLTCCPGSNS
134



MAW TP LFLFLLTCCPGSNS
135



MAWISLILSLLALSSAIS
314



IGWSYIILLLVATATVHS
315



MAWTSLILSLLALCSASS
316



MAWTSLILSLLALCSAIS
317



MGWSCVLLFLVSGTAVLC
318


 


QI
MDT LC STLLLLTIPSWVLS
36



MDT LC YTLLLLTTPSWVLS
37



MDFQVQIFSFLLISASIISRG
319



MDFQVQIFSFLLISASILFRG
320



MDFQVQIFSFLLISASILSRG
321



MDFQVQIFSFLLISASIMSRG
322



MDFQVQIFSFLLISASLMSRG
323



MDFQVQIFSFLLISRILSRG
324



MDFQVQIFSFLLISVSIMSRG
325



MDFQVQIFSFLLMSASIMSRG
326



MDTLCSTLLLLTIPSWVLS
327



MGWSWIFLFLLSGTAVHC
328



MHFQVQIFSFLLISASIMSRG
329


 


QL
MKH LW FFLLLVAAPRWVLS
56



MKH LW FFLLLVAAPRWVLS
57



MKH LW FFLLLVAAPRWVLP
58



MKH LW FFLLLVAAPRWVLS
59



MKH LW FFLLLVAAPRWVLS
60



MKH LW FFLLLVAAPRWVLS
61



MKH LW FFLLLVAAPRWVLS
62



MKH LW FFLLLVAAPRWVLS
63



MAW VS FYLLPFIFSTGLCA
127



M A WTQ LL LLFPLLLHWTGSLS
128



M AWT PL LFLTLLLHCTGSLS
129



MAWTPLFFFFVLHCSSFS
330


 


QM
MDWTWRILFLVAAATGAHS
28



MDWTWRILFLVAAATGAHS
29



MDWTWRILFLVAAATSAHS
30



MDWTWSILFLVAAPTGAHS
31



MDCTWRILFLVAAATGTHA
32



MDWTWRILFLVAAATDAYS
33



MDWTWRVFCLLAVAPGAHS
34



MDWIWRILFLVGAATGAHS
35



MRVLGFLCLVTVLPGSLS
331


 


QP
MAWVSFYLLPFIFSTGLCA
127



MAWTQLLLLFPLLLHWTGSLS
128



MAWTPLLFLTLLLHCTGSLS
129



MAWTPLLLLLLSHCTGSLS
130



MAWTPLLLLFLSHCTGSLS
131



MAWTLLLLVLLSHCTGSLS
132



MAWAPLLLTLLSLLTGSLS
137



MAWTPLFFFFLLHCSSFS
332


 


QS
MAWSPLFLTLITHCAGSWA
108



MAWSPLLLTLLAHCTGSWA
109



MASFPLLLTLLTHCAGSWA
110



MAGFPLLLTLLTHCAGSWA
111



MTCSPLLLTLLIHCTGSWA
112



MAWALLLLTLLTQGTGSWA
113



MAWALLLLSLLTQGTGSWA
114



MAWALLLLTLLTQGTGSWA
115



MAWALLLLTLLTQGTGSWA
116



MAWALLLLTLLTQDTGSWA
117


 


QT
MAWTPLFLFLLTCCPGSNS
134



MAWTPLFLFLLTCCPGSNS
135



MAWMMLLLGLLAYGSGVDS
136


 


QV
MDWTWRILFLVAAATGAHS
28



MDWTWRILFLVAAATGAHS
29



MDWTWRILFLVAAATSAHS
30



MDWTWSILFLVAAPTGAHS
31



MDCTWRILFLVAAATGTHA
32



MDWTWRILFLVAAATDAYS
33



MDWTWRVFCLLAVAPGAHS
34



MDWIWRILFLVGAATGAHS
35



MDTLCSTLLLLTIPSWVLS
36



MDTLCYTLLLLTTPSWVLS
37



MELGLSWVFLVAILEGVQC
38



MELGLSWIFLLAILKGVQC
39



MEFGLSWVFLVAIIKGVQC
40



MELGLSWVFLVAILEGVQC
41



MEFGLSWIFLAAILKGVQC
42



MEFGLSWVFLVAILKGVQC
43



MELGLRWVFLVAILEGVQC
44



MEFGLSWLFLVAILKGVQC
45



MEFGLSWVFLVALLRGVQC
46



MEFGLSWVFLVALLRGVQC
47



MEFGLSWVFLVAILKGVQC
48



MELGLCWVFLVAILEGVQC
49



MEFGLSWVFLVAILKGVQC
50



MEFWLSWVFLVAILKGVQC
51



MTEFGLSWVFLVAIFKGVQC
52



MEFGLSWVFLVAILKGVQC
53



MEFGLSWVFLVVILQGVQC
54



MEFGLSWVFLVAILKGVQC
55



MKHLWFFLLLVAAPRWVLS
56



MKHLWFFLLLVAAPRWVLS
57



MKHLWFFLLLVAAPRWVLP
58



MKHLWFFLLLVAAPRWVLS
59



MKHLWFFLLLVAAPRWVLS
60



MKHLWFFLLLVAAPRWVLS
61



MKHLWFFLLLVAAPRWVLS
62



MKHLWFFLLLVAAPRWVLS
63



MSVSFLIFLPVLGLPWGVLS
66



MDWTWRILFLVAAATGAHS
67



IFLFLLSITAVHC
333



KGGSCVSLFLVATANVHF
334



MAVLALLFCLVTFPSILS
335



MAVLGLLFCLVTFPSVLS
336



MAVLGLLLCLVTFPSVLS
337



MAWSWVFLFFLSVTTVHS
338



MDWIWIMLHLLAATGIQS
339



MECSWVFLFLLSLTAVHC
340



MEFGLSWVFLVALLRGVQC
341



MEWLXXFLLFLSLTAVHC
342



MEWSGVFIFLLSVTAVHS
343



MEWSGVFIFLLSVTAVYS
524



MEWSRVFIFLLSVTAVHS
525



MEWSWVFLFFLSVTTVHS
526



MEWSWVFLFLLSLTSVHS
527



MGRLTFSFLLLLPVPAVLS
528



MGWSCIIFFLVATATVHF
529



MGWSCIILFLVAAANVHS
530



MGWSCIILFLVAAATVHS
531



MGWSCIILFLVATATVHS
532



MGWSCIILFLVATATVHS
533



MGWSCIILFLVSTATVHS
534



MGWSCIILILVAAATVHS
535



MGWSCIILILVAAATVHS
536



MGWSCIILILVAAATVQF
537



MGWSCIMLFLAARATVHS
538



MGWSCIMLFLAATATVHF
539



MGWSCIMLFLAATATVHF
540



MGWSCIMLFLAATATVHS
541



MGWSCIMLFLAATATVHS
542



MGWSCIMLFLAATATVHS
543



MGWSFLPLFLAATATGVHS
544



MGWSRIFLFLLSITAVHC
545



MGWSSIILFLVATATVHS
546



MGWSWIFPFLLSGTAVHC
547



MGWSYIIFFLVATATVHF
548



MGWSYIIFFLVATATVHS
549



MGWSYIILFLVATATGHS
550



MGWSYIILFLVATATVHS
551



MGWSYIILFLVATATVNS
552



MRWSCIILFLVATATVHS
553


 


SA
METPASFLCLLLLWTT
344


 


SF
MAWTPLFFFFLLHCS
345



MAWTPLFFFFVLHCS
346


 


SI
MKSQTQVFIFLLLCVSAHG
347



MKSQTQVFVFLLLCVSAHG
348


 


SK
MDMWVQIFSLLLICVT
349


 


SR
MXTMDEHESGAVTPHQVLK
350



MGEQRIRSCHATSGAE
351



MNLPVHLLVLLLFWIP
352



MTMFSLALLLSLLLLCVS
353



MTMLSLAPLLSLLLL
354



MTMLSLVLLLSFLLLC
355



MVFTPQILGLMLFWIS
356



MVLGLKWVFFVVFYQ
357



MVSTSQLLGLLLFWTS
358



PAQFLFLLVLWIQ
359


 


SS
MAWIPLFLGVLAYCTGSVA
118



MAWTALLLSLLAHFTGSVA
119



MAWTPLLLPLLTFCTVSEA
120



MAWIPLLLPLLTLCTGSEA
121



MAWTPLWLTLLTLCIGSVV
122



MAWTVLLLGLLSHCTGSVT
123



MAWATLLLPLLNLYTGSIA
124



MAWIPLLLPLLTLCTGSEA
125



MAWIPLLLPLLILCTVSVA
126



IDINVQIFRFLLISVT
360



MKLPVLLVVLLLFTSP
361



MKLPVRLLVLMFWIP
362



MKLPVRLLVLMFWIP
363


 


ST
MEKDTLLLWVLLLWVP
364



MESDTLLLWVLLLWVP
365



MESDTLLLWVLLLWVP
366



METDPLLLWVLLLWVP
367



METDTILLWVLLLWVP
368



METDTLLLWVLLLWVP
369



METDTLLLWVLLLWVP
370



METDTLLLWVLLLWVP
371



MRFSAQLLGLLVLWIP
372



MVFTPQILGLMLFWIS
373


 


SY
MAWIPLFLGVLAYCTGSVA
118



MAWTALLLSLLAHFTGSVA
119



MAWTPLLLPLLTFCTVSEA
120



MAWIPLLLPLLTLCTGSEA
121



MAWTPLWLTLLTLCIGSVV
122



MAWTVLLLGLLSHCTGSVT
123



MAWATLLLPLLNLYTGSIA
124



MAWIPLLLPLLTLCTGSEA
125



MAWIPLLLPLLILCTVSVA
126


 


TC
MDSQAQVLILLLLWVS
374



MDSQAQVLMLLLLSVS
375



MDSQAQVLMLLLLWVS
376



MDSQARVLMLLLLWVS
377



MESQNHVLMFLLLWVS
378



MESQTHVLMFLLLWVS
379



MESQTQVFLSLLLWVS
380



MESQTQVLISLLFWVS
381



MESQTQVLMSLLFWVS
382


 


TG
METPASFLCLLLLWTTSAV
383


 


TN
QHGHEGLCSVSWVPVA
384



MMSPAQFLFLLVLWIQ
385



MMSPAQFLFLLVLWIR
386



MMSPVQFLFLLMLWIQ
387


 


TR
MIASAQFLGLLLLCFQ
388



MMSSAQFLGLLLLCFQ
389



MMSSAQFLGLLLLCFQ
390



MDMRAPAQIFGFLLLLFQ
391



MDMRVPAHVFGFLLLWFP
392


 


VC
MDCGISLVFLVLILK
393


 


VD
MEFQTQVFVFVLLWLS
394



MESQIQAFVFVFLWLS
395



MESQIQVFVFVFLWLS
396



MESQTQVFVYMLLWLS
397



MGFKMESHTQAFVFAFLWLS
398


 


VE
METHSQVFVYMLLWLS
399


 


VH
MEWLXXFLLFLSLTA
400



MEWSCIFLFLLSVTA
401



MEWSGVFIFLLSVTA
402



MEWSRVFIFLLSVTA
403



MEWSWVFLFFLSVTT
404



MEWSWVFLFLLSLTS
405



MGWNWIFILILSVTT
406



MGWSCIIFFLVATAT
407



MGWSCIILFLVAAAN
408



MGWSCIILFLVAAAT
409



MGWSCIILFLVATAT
410



MGWSCIILFLVATAT
411



MGWSCIILFLVATAT
412



MGWSCIILFLVSTAT
413



MGWSCIILILVAAAT
414



MGWSCIILILVAAAT
415



MGWSCIMLFLAARAT
416



MGWSCIMLFLAATAT
417



MGWSCIMLFLAATAT
418



MGWSCIMLFLAATAT
419



MGWSCIMLFLAATAT
420



MGWSCIMLFLAATAT
421



MGWSCIMLFLAATAT
422



MGWSCIMLFLAATAT
423



MGWSRIFLFLLSITA
424



MGWSSIILFLVATAT
425



MGWSWIFLFLLSGSA
426



MGWSWIFLFLLSGTA
427



MGWSWIFLFLLSGTA
428



MGWSWIFLLFLSGTA
429



MGWSWIFPFLLSGTA
430



MGWSYIIFFLVATAT
431



MGWSYIIFFLVATAT
432



MGWSYIILFLVATAT
433



MGWSYIILFLVATAT
434



MGWSYIILFLVATAT
435



MLLGLKWVFFVVFYQ
436



MRWSCIILFLVATAT
437



MRWSCIILFLVATAT
438



MVSETHVLIFLLLWVS
439



IFLFLLSITA
440



IGWSYIILLLVATAT
441



IKWSWIFLFLLSGTA
442



IKWSWISLFLLSGTA
443



KGGSCVSLFLVATAN
444



MAWSWVFLFFLSVTT
445



MECSWVFLFLLSLTA
446


 


VI
MDMRVPAQLLGLLLLWLRGARC
68



MDMRVPAQLLGLLLLWLRGARC
69



MDMRVPAQLLGLLQLWLSGARC
70



MDMRVPAQLLGLLLLWLSGARC
71



MDMRVPAQLLGLLLLWLPDTRC
72



MDMRVPAQLLGLLLLWFPGARC
73



MDMRVPAQLLGLLLLWFPGARC
74



MDMRVLAQLLGLLLLCFPGARC
75



MDMRVLAQLLGLLLLCFPGARC
76



MDMRVPAQLLGLLLLWLPGARC
77



MDMRVPAQLLGLLLLWLPGARC
78



MDMRVPAQLLGLLLLWFPGSRC
79



MDMRVPAQLLGLLLLWFPGSRC
80



MDMRVPAQLLGLLLLWLPGARC
81



MDMRVPAQRLGLLLLWFPGARC
82



MRVPAQLLGLLLLWLPGARC
83



MDMRVPAQLLGLLLLWLPGARC
84



MDMRVPAQLLGLLLLWLPGARC
85



MDMRVPAQLLGLLLLWLPGAKC
86



MIYSLQLLRMLVLWIPISK
447



MSYSLQLLRMLVLWIPISK
448



MSYSLQLLRMLVLWIPITK
449


 


VL
LVLK
450



MAVLGLLFCLVTFPS
451



MAVLGLLLCLVTFPS
452



MDRLTSSFLLLIVPA
453



MEWSWIFLFLLSGTA
454



MGRLTFSFLLLLPVPA
455



MGWSCVLLFLVSGTA
456



MGWSWIFFFLLSGTA
457



MGWSWIFLFFLSGTA
458



MGWSWIFLFLLSGSA
459



MGWSWIFLFLLSGTA
460



MGWSWIFLFLLSGTA
461



MGWSWIFLLFLSGTA
462



MGWSWIFLLFLSGTA
463



MGWSWVFLSFLSGTA
464


 


VM
MDFQVQIFSFLLISIS
465


 


VN
MAVVTGKGLPSPKLE
466



MGWSYIILFLVATAT
467



MQLGHLLPDGS
468



RSVPTQLLGLLLLWLT
469


 


VQ
LILK
470



LVLK
471



MDFGLIFFIVALLK
141



MDFGLSLVFLVLILK
02



MGWSCIILILVAAAT
05



MNFGLRLIFLVLTLK
20



MNFGLSLIFLVLILK
21


 


VR
MGVPTQLLLLWLT
22



MRVLAELLGLLLFCFL
23



MRVLPEFLGLLLLWIS
24


 


VS
MRCSLQFLGVLMFWIS
25



REWSWNFLFLLSGTT
26


 


VY
MEWSGVFIFLLSVTA
27


 


if the combination
ELWVLMVWVP
142


of the first two
ELWVLMVWVPSTS
143


amino acids of
HDHALTSSSPQPSSPLCL
144


the second poly-
LAVITSNIWFPMVCMS
145


peptide is not
MDMWTSAQFLGILLLWFLARC
146


listed in this
MDRLTSSFLLLIVPAVLS
147


table these first
MLRAIKAAPFSRFGCS
148


polypeptides may
MRAPAPFLGLLLFCFLARC
149


be used
MRCSPHFLELLVFWIL
150



MRPTLSFLGSCCSSLILRC
151



MRTPAHFLGLLLLCFLGRC
152



MRTPAPFLGLLLFCFSARC
153



MSLLTQLQGLLLLWLTDRC
154



MSLPTQLQGLLLLWLTARC
155



MTMLSLAPLLSLLLLCVS
156



MTSLSQLLGMLMLQSL
157



MVFAPQILGFLLLWIS
158



MVFTPHILGLLLFWIS
159



QHGHEGLCSVSWVPVATNS
160



REWSWNFLFLLSGTTVSS
161



TDFHMQIFSFMLISFTARC
162









If the dipeptide of the first two amino acids of the second polypeptide is not explicitly listed in Table 1, and no sequence as listed in the last row of Table 1 is intended to be used, it is beneficial not to string the first polypeptide and the second polypeptide directly together. In such a case it is favorable to insert a short sequence of up to five amino acids to resemble the beginning of the immunoglobulin FR1 region sequence which would naturally follow the first polypeptide. This sequence can be a single amino acid or a dipeptide, the peptide QIWNN (SEQ ID NO: 472) or a fragment thereof to resemble the first two amino acids of the naturally following immunoglobulin FR1 region.
After the first polypeptide or optionally after the inserted short sequence the second polypeptide comprises a heterologous polypeptide. This heterologous polypeptide has an amino acid sequence of from 5 to 500 amino acid residues. In a preferred embodiment of the invention the amino acid sequence is of from 10 to 350 amino acid residues and in a more preferred embodiment of from 15 to 150 amino acid residues. The polypeptide conjugated to the immunoglobulin is selected from the group comprising biological active molecules. These molecules exhibit a biological effect when administered to an artificial biological system or a living cell, such as in assay-systems, or to a living organism, such as birds or mammals, including humans. These biologically active compounds comprise, but are not limited to, agonists as well as antagonists of receptors, inhibitors as well as activators of enzymes, and the like, and also peptides, polypeptides, and proteins exhibiting cytotoxic, antiviral, antibacterial, or anti-cancer activity, as well as antigens. The biological effect can be, but is not limited, to enzyme inhibition, binding to a receptor, either at the binding site or circumferential, and signal triggering. These biologically active compounds are, for example, useful for pharmaceutic, therapeutic, or diagnostic applications.
The second polypeptide further comprises after the heterologous polypeptide a linker. Linkers that can preferably be used with the current invention are listed in Table 2.








TABLE 2







Possible linkers.










linker
linker amino acid sequence
SEQ ID NO:













1
[Ser(Gly)4]3
06



 


2
[Ser(Gly)4]5
07


 


3
[Gly(Gln)4]3
08


 


4
Gly(Ser)15Gly
09


 


5
GST
10


 


6
[(Gly)4Ser]3-Gly-Ala-Ser
139


 


7
Gly(Ser)15Gly-Ala-Ser
140


 


8
[(Gly)4Ser]3-Gly
554


 


9
[(Gly)4Ser]5-Gly
555


 


10
[(Gly)4Ser]3-Gly2
556


 


11
[(Gly)4Ser]5-Gly2
557









After the linker an immunoglobulin fragment follows as the carboxy-terminal part of the second polypeptide.
The second polypeptide comprises a heterologous polypeptide followed by a linker and followed by an immunoglobulin fragment as carboxy-terminal part, i.e. a nucleic acid encoding the second polypeptide comprises in a 5′ to 3′ direction nucleic acids encoding a heterologous polypeptide, a linker, and an immunoglobulin fragment.
Immunoglobulin molecules are assigned to five different classes: IgA (Immunoglobulin A), IgD, IgE, IgG and IgM. Of these IgG and IgE are more frequently used in pharmaceutic and diagnostic applications. Within these classes the immunoglobulins differ in their overall structure but the building blocks are similar. All immunoglobulins are built up of two different polypeptide chains, a light chain and a heavy chain.
An immunoglobulin fragment comprises the carboxy-terminal constant domain(s) of an immunoglobulin light or heavy chain, e.g. it comprises either at least the CH1-, CH2-, CH3-domain and the hinge-region of an immunoglobulin heavy chain and optionally a CH4-domain, or the CL-domain of an immunoglobulin light chain. The immunoglobulin from which the fragment is derived can be a naturally occurring or a synthetic immunoglobulin. In one embodiment of the invention the immunoglobulin fragment additionally contains a fragment of a heavy or light chain variable domain or of a variant thereof. In the variable domain fragment amino acid(s) or region(s) are deleted. In one embodiment of from one to six amino acids of the variable domain are deleted. In another embodiment of from one to six regions of the variable domain are deleted. In a further embodiment the variable domain is deleted. The presence of a functional, i.e. antigen recognizing, variable domain is not essential for the current invention. A not functionable immunoglobulin according to the invention is an immunoglobulin not possessing an antigen recognizing variable domain.
The different nucleic acid sequences are operably linked on an expression plasmid. For expression the plasmid is introduced into a host cell. Proteins are preferably produced in mammalian cells such as CHO cells, NS0 cells, Sp2/0 cells, COS cells, HEK cells, K562 cells, BHK cells, PER.C6 cells, and the like.
The following examples, sequence listing and figures are provided to aid the understanding of the present invention, the true scope of which is set forth in the appended claims. It is understood that modifications can be made in the procedures set forth without departing from the spirit of the invention.



DESCRIPTION OF THE FIGURES
FIG. 1 Common structure of immunoglobulins of the IgG class.
FIG. 2 Plasmid map of the anti-IGF-1R γ1-heavy chain expression vector 4818.
FIG. 3 Plasmid map of the anti-IGF-1R κ-light chain expression vector 4802.
FIG. 4 Plasmid map of the γ1-heavy chain constant region gene vector 4962.
FIG. 5 Plasmid map of the modified anti-IGF-1R κ-light chain expression vector 4964.
FIG. 6 Plasmid map of the modified anti-IGF-1R light chain expression vector 4963.
FIGS. 7a, 7b, and 7c Coomassie Blue stained SDS-PAGE-gels of affinity purified immunoglobulin conjugates; sample arrangement according to table 6.
FIGS. 8a, 8b, and 8c Immunodetection of the light chain in cell culture supernatants after transient expression in HEK293 EBNA cells; sample arrangement according to table 6.
FIG. 9 Immunodetection of the heavy chain in cell culture supernatants after transient expression in HEK293 EBNA cells; sample arrangement according to table 6.



EXAMPLES
Material & Methods
General information regarding the nucleotide sequences of human immunoglobulins light and heavy chains is given in: Kabat, E. A. et al., (1991) Sequences of Proteins of Immunological Interest, Fifth Ed., NIH Publication No 91-3242.
Amino acids of antibody chains are numbered according to EU numbering (Edelman, G. M., et al., Proc Natl Acad Sci USA 63 (1969) 78-85; Kabat, E. A., et al., (1991) Sequences of Proteins of Immunological Interest, Fifth Ed., NIH Publication No 91-3242).
Recombinant DNA Techniques
Standard methods were used to manipulate DNA as described in Sambrook, J. et al., Molecular cloning: A laboratory manual; Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989. The molecular biological reagents were used according to the manufacturer's instructions.
Protein Determination
The protein concentration was determined by determining the optical density (OD) at 280 nm, using the molar extinction coefficient calculated on the basis of the amino acid sequence.
DNA Sequence Determination
DNA sequences were determined by double strand sequencing performed at MediGenomix GmbH (Martinsried, Germany).
DNA and Protein Sequence Analysis and Sequence Data Management
The GCG's (Genetics Computer Group, Madison, Wis.) software package version 10.2 and Infomax's Vector NTI Advance suite version 8.0 was used for sequence creation, mapping, analysis, annotation and illustration.
Gene Synthesis
Desired gene segments were prepared by Medigenomix GmbH (Martinsried, Germany) from oligonucleotides made by chemical synthesis. The 100-600 bp long gene segments which are flanked by singular restriction endonuclease cleavage sites were assembled by annealing and ligation of oligonucleotides including PCR amplification and subsequently cloned into the pCR2.1-TOPO-TA cloning vector (Invitrogen Corp., USA) via A-overhangs. The DNA sequence of the subcloned gene fragments were confirmed by DNA sequencing.
Affinity Purification of Immunoglobulin Conjugates
The expressed and secreted immunoglobulin conjugates were purified by affinity chromatography using Protein A-SepharoseTM CL-4B (GE Healthcare, formerly Amersham Bioscience, Sweden) according to known methods. Briefly, after centrifugation (10,000 g for 10 minutes) and filtration through a 0.45 μm filter the immunoglobulin conjugate containing clarified culture supernatants were applied on a Protein A-SepharoseTM CL-4B column equilibrated with PBS buffer (10 mM Na2HPO4, 1 mM KH2PO4, 137 mM NaCl and 2.7 mM KCl, pH 7.4). Unbound proteins were washed out with PBS equilibration buffer and 0.1 M citrate buffer, pH 5.5. The immunoglobulin conjugates were eluted with 0.1 M citrate buffer, pH 3.0 and the immunoglobulin conjugate containing fractions were neutralized with 1 M Tris-Base. Then, the immunoglobulin conjugates were extensively dialyzed against PBS buffer at 4° C., concentrated with a ultrafree centrifugal filter device equipped with a Biomax-SK membrane (Millipore Corp., USA) and stored in an ice-water bath at 0° C.
Example 1
Making of the Expression Plasmids
The gene segments encoding an insulin-like growth factor I receptor (IGF-1R) antibody light chain variable region (VL) and the human kappa-light chain constant region (CL) were joined as were gene segments for the anti-IGF-1R heavy chain variable region (VH) and the human gamma1-heavy chain constant region (CH1-Hinge-CH2-CH3).
a) Vector 4818
Vector 4818 is the expression plasmid for the transient expression of anti-IGF-1R antibody (also denoted as anti-IGF-1R in the following) heavy chain (genomically organized expression cassette; exon-intron organization) in HEK293 EBNA cells (for sequences see US 2005/0008642). It comprises the following functional elements:
Beside the anti-IGF-1R γ1-heavy chain expression cassette this vector contains:

    
    
        a hygromycin resistance gene as a selectable marker,
        an origin of replication, oriP, of Epstein-Barr virus (EBV),
        an origin of replication from the vector pUC18 which allows replication of this plasmid in E. coli, and
        a beta-lactamase gene which confers ampicillin resistance in E. coli. 
    
    


The transcription unit of the anti-IGF-1R gamma1-heavy gene is composed of the following elements:

    
    
        the immediate early enhancer and promoter from the human cytomegalovirus (HCMV),
        a synthetic 5′-untranslated region (UT),
        a murine immunoglobulin heavy chain signal sequence including a signal sequence intron (signal sequence 1, intron, signal sequence 2 [L1-intron-L2]),
        the cloned anti-IGF-1R variable heavy chain encoding segment arranged with a unique BsmI restriction site at the 5′-end (L2 signal sequence) and a splice donor site and a unique NotI restriction site at the 3′-end,
        a mouse/human heavy chain hybrid intron 2 including the mouse heavy chain enhancer element (part JH3, JH4) (Neuberger, M. S., EMBO J. 2 (1983) 1373-1378),
        the genomic human γ1-heavy gene constant region,
        the human γ1-immunoglobulin polyadenylation (“poly A”) signal sequence, and
        the unique restriction sites AscI and SgrAI at the 5′- and 3′-end, respectively.
    
    


The plasmid map of the anti-IGF-1R γ1-heavy chain expression vector 4818 is shown in FIG. 2.
b) Vector 4802
Vector 4802 is the expression plasmid for the transient expression of anti-IGF-1R antibody light chain (cDNA) in HEK293 EBNA cells. It comprises the following functional elements.
Beside the anti-IGF-1R kappa-light chain expression cassette this vector contains:

    
    
        a hygromycin resistance gene as a selectable marker, a an origin of replication, oriP, of Epstein-Barr virus (EBV),
        an origin of replication from the vector pUC18 which allows replication of this plasmid in E. coli, and
        a β-lactamase gene which confers ampicillin resistance in E. coli. 
    
    


The transcription unit of the anti-IGF-1R κ-light gene is composed of the following elements:

    
    
        the immediate early enhancer and promoter from the human cytomegalovirus (HCMV),
        the cloned anti-IGF-1R variable light chain cDNA including
        the native 5′-UT and
        the native light chain signal sequence of the human immunoglobulin germline gene arranged with a unique BglII restriction site at the 5′-end,
        the human κ-light gene constant region,
        the human immunoglobulin κ-polyadenylation (“poly A”) signal sequence, and
        the unique restriction sites AscI and FseI at the 5′- and 3′-end, respectively.
    
    


The plasmid map of the anti-IGF-1R κ-light chain expression vector 4802 is shown in FIG. 3.
c) Plasmid 4962
Vector 4962 served as basic structure for the assembling of expression plasmids 4965, 4966 and 4967. These plasmids enabled the transient expression of modified antibody heavy chains (N-terminal conjugation without variable domain, cDNA organization) in HEK 293 EBNA cells. Plasmid 4962 comprises the following functional elements.
Beside the expression cassette for the gamma 1-heavy chain constant region this vector contains:

    
    
        a hygromycin resistance gene as a selectable marker,
        an origin of replication, oriP, of Epstein-Barr virus (EBV),
        an origin of replication from the vector pUC18 which allows replication of this plasmid in E. coli, and
        a beta-lactamase gene which confers ampicillin resistance in E. coli. 
    
    


The transcription unit of the γ1-heavy chain constant region gene (CH1-Hinge-CH2-CH3) is composed of the following elements:

    
    
        the immediate early enhancer and promoter from the human cytomegalovirus (HCMV),
        a synthetic linker (SEQ ID NO: 01) comprising a single BglII restriction site at the 5′-end and a single NheI restriction site at the 3′-end (NheI site within the CH1 N-terminus)
    
    












HCMV-promoter                 AlaSer(CH1)




            ...agatcttttgccaccgctagc...



               BglII          NheI






    
    
        the human γ1-heavy chain gene constant region (CH1-Hinge-CH2-CH3, cDNA organization),
        the human γ1-immunoglobulin polyadenylation (“poly A”) signal sequence, and
        the unique restriction sites AscI and FseI at the 5′- and 3′-end, respectively.
    
    


The plasmid map of the γ1-heavy chain constant region gene vector 4962 is shown in FIG. 4.
d) Plasmid 4964
Vector 4964 served as basic structure for the assembling of expression plasmids 4976 and 4977. These plasmids enabled the transient expression of modified anti-IGF-1R antibody light chains (N-terminal conjugation) in HEK 293 EBNA cells.
The plasmid 4964 is a variant of expression plasmid 4802.
The transcription unit of the anti-IGF-1R κ-light gene was modified as indicated below:
The native light chain signal sequence is replaced by a synthetic linker arranged with a unique BglII restriction site at the 5′- and a unique NheI restriction site at the 3′-end directly joined to the VL-IGF-1R variable region (SEQ ID NO: 03).










                           |- VL-1R18




...agatctatatatatatatgctagcgaaattgtgttgaca...



                     AlaSerGluIleValLeuThr...



   BglII             NheI






The plasmid map of the modified anti-IGF-1R κ-light chain expression vector 4964 is shown in FIG. 5.
e) Plasmid 4969
The expression plasmid 4969 is derived from plasmid 4802 which is an expression plasmid for the anti-IGF-1R antibody light chain. The plasmid encodes a modified antibody light chain fragment (N-terminal conjugation without variable domain; polypeptide-linker-constant region of kappa chain).
For the construction of plasmid 4969 a unique BglII restriction site was introduced at the 3′-end of the CMV-promoter and a unique BbsI restriction site was introduced inside of the constant region of the anti-IGF-1R antibody light chain (SEQ ID NO: 04).










|--  C-kappa           BbsI




cgaactgtggctgcaccatctgtcttcatcttc...



ArgThrValAlaAlaProSerValPheIlePhe...






f) Plasmid 4963

This plasmid enabled the transient expression of anti-IGF-1R antibody light chains in HEK 293 EBNA cells.
The plasmid 4963 is a variant of expression plasmid 4802.
The transcription unit of the anti-IGF-1R κ-light gene was modified as indicated below:

    
    
        the human κ-light chain constant gene region was slightly modified at the C-kappa-Ig-kappa pA joining region (insertion of a unique HindIII and KasI restriction site, SEQ ID NO: 558).
    
    










 ...C-kappa                      Ig-kappa-pA



 ...AaaagcttcaacaggggagagtgtTGAagggagaggcgccccca


 ...LysSerPheAsnArgGlyGluCys


      HindIII                         KasI






The plasmid map of the modified anti-IGF-1R light chain expression vector 4963 is shown FIG. 6.
Example 2
Making the Final Expression Plasmids
The immunoglobulin fusion genes (heavy and light chain) comprising the immunoglobulin gene segment, linker gene segment and polypeptide gene segment have been assembled with known recombinant methods and techniques by connection of the according gene segments.
The nucleic acid sequences encoding the peptide linkers and polypeptides were each synthesized by chemical synthesis and then ligated into an E. coli plasmid. The subcloned nucleic acid sequences were verified by DNA sequencing.
The employed immunoglobulin polypeptide chains, the immunoglobulin fragment, the location of the polypeptide conjugation (N-terminal), the employed linker and the employed polypeptide are listed in Table 2 (page 30), Table 3 and Table 3a.







TABLE 3







Employed proteins and polypeptides; the amino acid sequence and


the numbering of the positions is as in the BH8 reference strain


(Locus HIVH3BH8; HIV-1 isolate LAI/IIIB clone BH8 from France;


Ratner, L., et al., Nature 313 (1985) 277-384).








proteins and polypeptides
SEQ ID NO:





HIV-1 gp41 (position 507-851 of BH8 gp 160)
11


T-651 (see e.g. U.S. Pat. No. 6,656,906)
12


HIV-1 gp41 ectodomain variant single mutant: I568P
13


HIV-1 gp41 ectodomain variant quadruple mutant:
14


I568P, L550E, L566E, I580E

















TABLE 3a







Chemically prepared gene segments used for



immunoglobulin conjugate gene construction.










SEQ




ID


Insert
NO:





Insert 4964 (introduction of unique restriction
15



sites)


 


Insert 4965 (with T-651) comprising signal
16


sequence (MDTLCSTLLLLTIPSWVLS), inserted short


sequence (QIWNN), heterologous polypeptide


(MTWMEWDREINNYTSLIHSLIEESQNQQEKNEQELL), linker


(GGGGSGGGGSGGGGSG)


 


Insert 4966 (with T-651) comprising signal
17


sequence (MDTLCSTLLLLTIPSWVLS), inserted short


sequence (QIWNN), heterologous polypeptide


(MTWMEWDREINNYTSLIHSLIEESQNQQEKNEQELL, linker


(GGGGSGGGGSGGGGSGGGGSGGGGSG)


 


Insert 4967 (with T-651) comprising signal
18


sequence (MDTLCSTLLLLTIPSWVLS), inserted short


sequence (QIWNN), heterologous polypeptide


(MTWMEWDREINNYTSLIHSLIEESQNQQEKNEQELL), linker


(GSSSSSSSSSSSSSSSG)


 


Insert 4969 (gp41 single mutant) comprising
19


signal peptide (MEFGLSWVFLVALLRGVQC), inserted


short sequence (Q), heterologous polypeptide


(VQARQLLSGIVQQQNNLLRAIEGQQHLLQLTVWGPKQLQARIL


AVERYLKDQQLLGIWGCSGKLICTTAVPWNASWSNKSLEQIWNN


MTWMEWDREINNYTSLIHSLIEESQNQQEKNEQELL), linker


(GGGGSGGGGSGGGGSG)









The components used for the construction of the final expression plasmids for transient expression of the modified immunoglobulin polypeptide light and heavy chains (the expression cassettes) are listed in Table 4 with respect to the used basis plasmid, cloning site, and inserted nucleic acid sequence encoding the conjugated immunoglobulin polypeptides.







TABLE 4







Components employed in the construction


of the used expression plasmids.










Expression
Basis
Inserted DNA
Cloning


plasmid
vector
gene segment
sites










N-terminal conjugation: Heavy chain (without variable domain)










4965
4962
Insert 4965 (249 Bp)
BglII/NheI


4966
4962
Insert 4966 (279 Bp)
BglII/NheI


4967
4962
Insert 4967 (252 Bp)
BglII/NheI







N-terminal conjugation: Light chain (without variable domain)










4969
4802
Insert 4969 (589 Bp)
BglII/BbsI







N-terminal conjugation: Light chain (including the variable domain)










4976
4964
Insert 4965 (249 Bp)
HindIII/KasI


4977
4964
Insert 4967 (252 Bp)
HindIII/KasI









In Table 5 is listed: the used polypeptides with HIV-1 inhibitory properties (T-651 and HIV-1 gp41 ectodomain variants), the used linkers to join the immunoglobulin light or heavy chain with the polypeptide and the deduced molecular weight of the modified antibody chains as deduced from the encoded amino acid sequences.







TABLE 5







Summary of the employed polypeptides and the deduced molecular


weight of the modified immunoglobulin polypeptide chains.










expression

molecular
linker


plasmid
polypeptide
weight [Da]
SEQ ID NO:










Reference plasmids










4818
anti-IGF-1R
49263.5
no linker



heavy chain


4802
anti-IGF-1R
23572.2
no linker



light chain







N-terminal fusions: Heavy chain (without variable domain)










4965
T-651
42227.3
554


4966
T-651
42857.9
555


4967
T-651
42644.7
09







N-terminal fusions: Light chain (without variable domain)










4969
Gp41 single
27247.3
554



mutant







N-terminal fusions: Light chain (including the variable domain)










4976
T-651
29851.9
139


4977
T-651
30269.2
140









Example 3
Transient Expression of Immunoglobulin Variants in HEK293 EBNA Cells
Recombinant immunoglobulin variants were generated by transient transfection of adherent growing K293-EBNA cells (human embryonic kidney cell line 293 expressing Epstein-Barr-Virus nuclear antigen; American type culture collection deposit number ATCC # CRL-10852) cultivated in DMEM (Dulbecco's modified Eagle's medium, Gibco, Invitrogen Corp., USA) supplemented with 10% ultra-low IgG FCS (fetal calf serum, Gibco, Invitrogen Corp., USA), 2 mM Glutamine (Gibco, Invitrogen Corp., USA), 1% volume by volume (v/v) nonessential amino acids (Gibco, Invitrogen Corp., USA) and 250 μg/ml G418 (Roche Molecular Biochemicals, Roche Diagnostics GmbH, Germany). For transfection FugeneTM 6 Transfection Reagent (Roche Molecular Biochemicals, Roche Diagnostics GmbH, Germany) was used in a ratio of reagent (μl) to DNA (μg) ranging from 3:1 to 6:1. Immunoglobulin polypeptide light and heavy chains were expressed from two different plasmids using a molar ratio of light chain to heavy chain encoding plasmid from 1:2 to 2:1. Immunoglobulin variants containing cell culture supernatants were harvested at day 4 to 11 after transfection. Supernatants were stored at 0° C. in an ice-water bath until purification.
General information regarding the recombinant expression of human immunoglobulins in e.g. HEK293 cells is given in: Meissner, P. et al., Biotechnol. Bioeng. 75 (2001) 197-203.
Example 4
Expression Analysis Using SDS Page, Western Blotting Transfer and Detection with Immunoglobulin Specific Antibody Conjugates
The expressed and secreted polypeptides were processed by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis (SDS-PAGE), and the separated polypeptides were transferred to a membrane from the gel and subsequently detected by an immunological method.
SDS-PAGE
LDS sample buffer, fourfold concentrate (4×): 4 g glycerol, 0.682 g Tris-Base, 0.666 g Tris-hydrochloride, 0.8 g LDS (lithium dodecyl sulfate), 0.006 g EDTA (ethylene diamine tetra-acetic acid), 0.75 ml of a 1% by weight (w/w) solution of Serva Blue G250 in water, 0.75 ml of a 1% by weight (w/w) solution of phenol red, add water to make a total volume of 10 ml.
The culture broth containing the secreted polypeptide was centrifuged to remove cells and cell debris. An aliquot of the clarified supernatant was admixed with 1/4 volumes (v/v) of 4×LDS sample buffer and 1/10 volume (v/v) of 0.5 M 1,4-dithiothreitol (DTT). Then the samples were incubated for 10 min. at 70° C. and protein separated by SDS-PAGE. The NuPAGE® Pre-Cast gel system (Invitrogen Corp., USA) was used according to the manufacturer's instruction. In particular, 10% NuPAGE® Novex® Bis-Tris Pre-Cast gels (pH 6.4) and a NuPAGE® MOPS running buffer was used.
Western Blot
Transfer buffer: 39 mM glycine, 48 mM Tris-hydrochloride, 0.04% by weight (w/w) SDS, and 20% by volume methanol (v/v)
After SDS-PAGE the separated immunoglobulin conjugate polypeptide chains were transferred electrophoretically to a nitrocellulose filter membrane (pore size: 0.45 μm) according to the “Semidry-Blotting-Method” of Burnette (Burnette, W. N., Anal. Biochem. 112 (1981) 195-203).
Immunological Detection
TBS-buffer: 50 mM Tris-hydrochloride, 150 mM NaCl, adjusted to pH 7.5
Blocking solution: 1% (w/v) Western Blocking Reagent (Roche Molecular Biochemicals, Roche Diagnostics GmbH, Germany) in TBS-buffer
TBST-Buffer: 1×TBS-buffer with 0.05% by volume (v/v) Tween-20
For immunological detection the western blotting membranes were incubated with shaking at room temperature two times for 5 minutes in TBS-buffer and once for 90 minutes in blocking solution.
Detection of the Immunoglobulin Conjugate Polypeptide Chains
Heavy chain: For detection of the heavy chain or heavy chain fragment containing polypeptides a purified rabbit anti-human IgG antibody conjugated to a peroxidase was used (Code No. P 0214, DAKO, Denmark).
Light chain: Polypeptides containing light chain or light chain fragments were detected with a purified peroxidase conjugated rabbit anti-human kappa light chain antibody (DAKO, Denmark, Code No. P 0129).
For visualization of the antibody light and heavy chains or fragments thereof washed and blocked Western blot membranes were first incubated in case of a heavy chain with a purified rabbit anti-human IgG antibody conjugated to a peroxidase or in case of a light chain with a purified peroxidase conjugated rabbit anti-human kappa light chain antibody in a 1:10,000 dilution in 10 ml blocking solution at 4° C. with shaking over night. After washing the membranes three times with TBTS-buffer and once with TBS buffer for 10 min. at room temperature. The Western-blot membranes were developed with a Luminol/peroxid-solution generating chemi-luminescence (Lumi-LightPLUS Western Blotting Substrate, Roche Molecular Biochemicals, Roche Diagnostics GmbH, Germany). Therefore the membranes were incubated in 10 ml Luminol/peroxide-solution for 10 seconds to 5 minutes and the emitted light was detected afterwards with a Lumi-Imager F1 Analysator (Roche Molecular Biochemicals, Roche Diagnostics GmbH, Germany) and/or was recorded with an x-ray-film.
The intensity of the spots was quantified with the LumiAnalyst Software (Version 3.1).
Multiple-Staining of Immunoblots
The secondary peroxidase-labeled antibody conjugate used for the detection can be removed from the stained blot by incubating the membrane for one hour at 70° C. in 1 M Tris-hydrochloride-buffer (pH 6.7) containing 100 mM beta-mercaptoethanol and 20% (w/v) SDS. After this treatment the blot can be stained with a different secondary antibody a second time. Prior to the second detection the blot is washed three times at room temperature with shaking in TBS-buffer for 10 minutes each.
The sample arrangement is listed in table 6.







TABLE 6







Sample arrangement of SDS PAGE gels/Western blots










expression plasmids











sample
light chain
heavy chain
note





MW marker





anti-IGF-1R


(reference Ab), 50 ng


anti-IGF-1R


(reference Ab), 150 ng


anti-IGF-1R


(reference Ab), 500 ng


HEK293 culture medium


 3
4802 (wt)
4818 (wt)
anti-IGF-1R





(reference Ab)





control


 4
4802 (wt)
4961 (wt)
anti-IGF-1R





(reference Ab)





control


 5
4963 (wt)
4818 (wt)
anti-IGF-1R





(reference Ab)





control


 6
4802 (wt)
4965
N-term; heavy;





without VH


 7
4802 (wt)
4966
N-term; heavy;





without VH


 8
4802 (wt)
4967
N-term; heavy;





without VH


 9
4969
4818 (wt)
N-term; light;





without VL


10
4976
4818 (wt)
N-term; light


11
4977
4918 (wt)
N-term; light


12
4969
4966
N-term; light;





without VL





N-term; heavy;





without VH


13
4976
4966
N-term; light;





N-term; heavy;





without VH


14
4977
4967
N-term; light





N-term; heavy;





without VH









Example 5
Detection of Assembled Immunoglobulin Polypeptides
Purification and Concentration of Immunoglobulin Polypeptides by Affinity Binding to Protein A SepharoseTM CL-4B
HEK 293 EBNA cells containing one or more plasmids were cultivated under conditions suitable for the transient expression of the polypeptide gene(s) located on the plasmid(s) for 6 to 10 days. To 1 ml clarified culture supernatant in a 1.8 ml Eppendorf cup 0.1 ml of a Protein A SepharoseTM CL-4B (GE Healthcare, formerly Amersham Biosciences, Sweden) suspension (1:1 (v/v) suspension of Protein A Sepharose in PBS buffer (10 mM Na2HPO4, 1 mM KH2PO4, 137 mM NaCl and 2.7 mM KCl, pH 7.4)) was added. The suspension was incubated for a time of between one and sixteen hours at room temperature with shaking. Thereafter the Sepharose beads were sedimented by centrifugation (30 s, 5000 rpm) and the supernatant was discarded. The Sepharose pellet was washed subsequently each with 1.6 ml PBS buffer, 1.6 ml 0.1 M citrate buffer pH 5.0 and 1.6 ml distilled water. The protein A bound immunoglobulin was extracted from the Sepharose beads with 0.1 ml 1×LDS-PAGE sample buffer at 70° C. for 5 to 10 min. The analysis was done by SDS-PAGE separation and staining with Coomassie brilliant blue as described in example 4.
Results:
Expression/Secretion-Analysis of Heavy and/or Light Chain Fragment Containing Polypeptides After Transient Expression:
FIG. 7a-c: Coomassie Blue stained SDS-PAGE-gels of affinity purified polypeptides; sample arrangement according to table 6.
Immunodetection of Immunoglobulin Containing Polypeptides:
FIG. 8a-c: Immunodetection of light chain fragment containing polypeptides in cell culture supernatants after transient expression in HEK293 EBNA cells.
FIG. 9a-c: Immunodetection of the heavy chain fragment containing polypeptides in cell culture supernatants after transient expression in HEK293 EBNA cells.
From FIGS. 7a-c, 9a-c and 10 a-c it can be deduced that the polypeptides are transiently expressed and secreted into the culture medium. In the case that the immunoglobulin containing polypeptide possesses one or several glycosylation sites the final polypeptides have no exactly defined molecular weight but a molecular weight distribution depending on the extent of glycosylation. This causes in SDS-PAGE that the species all representing one polypeptide do not migrate homogeneously and thus the bands are broadened.
Example 6
Quantitation of the Expressed Heavy Chain Containing Polypeptides with Human IgG ELISA
The immunoglobulin heavy chain fragment containing polypeptide concentration in cell culture supernatants was determined by a sandwich ELISA which used a biotinylated anti-human IgG F(ab′)2 fragment as the capture reagent and for detection a peroxidase-conjugated anti-human IgG F(ab′)2 antibody fragment.
Streptavidin coated 96-well plates (Pierce Reacti-BindTM Streptavidin Coated Polystyrene Strip Plates, Code No. 15121, Pierce Chemical Company, USA) were coated with 0.5 μg/ml biotinylated goat polyclonal anti-human IgG F(ab′)2 antibody fragment ((F(ab′)2<h-Fcγ>Bi; Dianova, Germany, Code No. 109-066-098) capture antibody (0.1 ml/well) in diluent buffer (diluent buffer: PBS buffer containing 0.5% weight by volume (w/v) bovine serum albumin) by incubation for one hour at room temperature (RT) under shaking. Thereafter, the plates were washed three times with more than 0.3 ml wash buffer (wash buffer: PBS containing 1% weight by volume (w/v) Tween 20). IgG immunoglobulin conjugate containing cell culture supernatants (samples) were diluted serially (twofold) up to a concentration of 0.5-20 ng/ml in diluent buffer, added to plates and incubated for one hour at RT with shaking. Purified anti-IGF-1R standard antibody (0.5-20 ng/ml) in diluent buffer was used for the generation of an IgG protein standard curve. After washing the plates three times with 0.3 ml/well wash buffer, bound complexes to human Fcgamma were detected with a peroxidase-conjugated F(ab′)2 fragment of goat polyclonal anti-human F(ab′)2-specific IgG [F(ab′)2<h-Fcγ>POD; Dianova, Code No. 109-036-098]. After washing the plates thrice with 0.3 ml/well wash buffer the plates were developed with ABTS® (2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) peroxidase substrate solution (Roche Molecular Biochemicals, Code No. 1684302, Roche Diagnostics GmbH, Germany). After 10-30 minutes the absorbance was measured at 405 nm and 490 nm against a reagent blank (incubation buffer+ABTS solution) on a Tecan Spectrafluorplus plate reader (Tecan Deutschland GmbH, Germany). For background correction the absorbance at 490 nm was subtracted from the absorbance at 405 nm according to formula I. All samples were assayed at least as duplicates, and the values from double or triple absorbance measurements were averaged. The IgG content of the samples were calculated from a standard curve.

ΔA=(Asample405−Asample490)−(Ablank405−Ablank490)  Formula I

## Claims

1. A method for the recombinant production of a heterologous polypeptide in a eukaryotic host cell, said method comprising:
a) providing a eukaryotic host cell comprising an expression plasmid, wherein the expression plasmid comprises in a 5′ to 3′ direction:
aa) a promoter,
ab) a nucleic acid encoding a first polypeptide, wherein said first polypeptide is murine immunoglobulin signal sequence comprising SEQ ID NO: 327,
ac) a nucleic acid encoding a said second polypeptide, comprising
i) a nucleic acid encoding said heterologous polypeptide comprising SEQ ID NO: 12,
ii) a nucleic acid encoding a linker,
iii) a nucleic acid encoding an immunoglobulin fragment,
wherein said second polypeptide further comprises an additional nucleic acid encoding the peptide QIWNN (SEQ ID NO: 472) in 5′ position to the nucleic acid encoding said heterologous polypeptide,

ad) a 3′ untranslated region comprising a polyadenylation signal, and

b) cultivating the host cell in a culture medium under conditions suitable for the expression of the second polypeptide.

2. The method of claim 1, further comprising:
c) recovering the second polypeptide from the culture medium.

3. The method of claim 1, wherein said immunoglobulin fragment is obtained either from an IgG or from an IgE.

4. The method of claim 1, wherein said eukaryotic cell is a mammalian cell.

5. The method of claim 4, wherein the mammalian cell is selected from the group consisting of a CHO cell, NS0 cell, Sp2/0 cell, COS cell, K562 cell, BHK cell, PER.C6 cell and HEK cell.

6. The method of claim 1, wherein said linker comprises a polypeptide selected from the group consisting of SEQ ID NO: 06, 07, 08, 09, 10, 139, 140, 554, 555, 556, and 557.

7. The method of claim 1, wherein said immunoglobulin fragment comprises
a) either the CH1-, CH2-, CH3-domain and the hinge region of an immunoglobulin heavy chain or the CL-domain of an immunoglobulin light chain; and
b) a fragment of a variable immunoglobulin heavy or light chain domain.

8. The method of claim 1, wherein said immunoglobulin fragment comprises only constant domains.

9. A plasmid, comprising in 5′ to 3′ direction:
a) a promoter,
b) a nucleic acid encoding a first polypeptide, wherein said first polypeptide is murine immunoglobulin signal sequence comprising SEQ ID NO: 327;
c) a nucleic acid encoding a second polypeptide comprising
i) a nucleic acid encoding a heterologous polypeptide comprising SEQ ID NO: 12,
ii) a nucleic acid encoding a linker,
iii) a nucleic acid encoding an immunoglobulin fragment;
wherein said second polypeptide further comprises an additional nucleic acid encoding the peptide QIWNN (SEQ ID NO: 472) in 5′ position to the nucleic acid encoding said heterologous polypeptide, and

d) a 3′ untranslated region comprising a polyadenylation signal.

10. The plasmid of claim 9 wherein said linker comprises a polypeptide selected from the group consisting of SEQ ID NO: 06, 07, 08, 09, 10, 139, 140, 554, 555, 556, and 557.