COMBINED PROTEIN SPECIFICALLY RECOGNISING MELANOMA CELLS Russian patent published in 2014 - IPC C07K19/00 C07K14/195 C07K7/04 C12N15/00 C12N15/63 C12N1/20 

FIELD: biotechnologies.

SUBSTANCE: invention represents a combined recombinant protein of the formula: S-L-R, including SR10, SR13, SR15, SdR10, SdR13 or SdR15, which specifically recognises melanoma cells, where S - streptavidin monomer, L - linker having amino-acid sequence Ser-Arg-Asp-Asp-Asp-Asp-Lys containing a restriction site with enteropeptidase and marked as "d", or amino-acid sequence Ser-Arg-Ala-Gly-Ala,R - melanoma-addressing oligopeptide representing R10 having amino-acid sequence Asp-Gly-Ala-Arg-Tyr-Cys-Arg-Gly-Asp-Cys-Phe-Asp-Gly, or R13 having amino-acid sequence Leu-Ser-Gly-Cys-Arg-Gly-Asp-Cys-Phe-Glu-Glu, or R15 having amino-acid sequence Asp-Gly-Phe-Pro-Gly-Cys-Arg-Gly-Asp-Cys-Ser-Gln-Glu. This invention also describes recombinant plasmid DNAs pSR and pSdR for expression of the specified combined proteins, bacterial strains Escherichia coli MG1655/pSR and MG1655/pSdR, producers of the specified combined proteins and a producing method of melanoma-addressing oligopeptide R from combined recombinant proteins SdR10, SdR13 or SdR15.

EFFECT: invention allows producing combined proteins that provide selective and effective binding to receptors on the surface of melanoma cells and can be used in diagnostics and therapy of cancer of a human being.

9 cl, 7 dwg, 5 ex