FIELD: medicine.
SUBSTANCE: invention describes nucleotide sequence (dwg.2), coding immunogenic polypeptide LcrV(G113), serving the base for construction of recombinant plasmid DNA pETV-I-3455, with the size 6538 bp, which codes immunogenic polypeptide LcrV(G113). Plasmid consists of plasmid pBR322 replicon, β-lactamase gene, determining resistance to ampicillin, T7-promoter, 1ac-operator, f1-replicon and DNA fragment, flanked by the sites for restrictases Ndel and Hindlll, coding synthesis of protein LcrV(G113), which starts from initiating codon ATG. Described is recombinant strain of bacteria E. coli BL21 (DE3)/pETV-I-3455 - producer of immunogenic polypeptide LcrV(G113) with amino acid sequence, represented on dwg.3, where tryptophan in position 113 (W113) is substituted with glycin. Described is method of obtaining said polypeptide by cultivation of strain E. coli BL21(DE3)/pETV-I-3455. Cells are destroyed in buffer solution by ultrasound and polypeptide is isolated successively by gel-permeation chromatography with application of carrier TSK HW-40, anion-exchanging and hydrophobic chromatography.
EFFECT: invention makes it possible to obtain product with high immunogenic and protective activity.
5 cl, 10 dwg, 2 tbl, 5 ex
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