EVALUATION OF SIGNIFICANCE OF BORRELIA GARINII SPIROCHETE RECOMBINANT PROTEIN DbpB FOR SERODIAGNOSTICS OF IXODES TICK-BORNE BORRELIOSIS


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Abstract

Aim. Obtaining recombinant protein DbpB of West Siberia Borrelia garinii 20047 isolate and evaluation of its antigen activity for the possible use in serodiagnostics of ixodes tick-borne bor-reliosis (ITB). Materials and methods. Coding region of dbpB gene of novosibirsk B. garinii 20047 isolate was amplified by PCR and cloned as part of expressing pETm vector in Escherichia coli BL21(DE3) strain cells. Recombinant protein DbpB produced by the selected clone was studied by EIA method for its ability to react with sera antibodies oflTB patients. Results. E. coli BL21(DE3) clone producing recombinant protein DbpB in quantity of 30% of total E. coli cell protein was obtained. Homology of amino acid sequence of recombinant protein DbpB of novosibirsk B.garinii 20047 isolate with primary structures of B. garinii, B. afzelii and B. burgdorferi sensu stricto spirochete genospieces DbpB proteins presented in GenBank database was 98.4, 77 and 73%, respectively. Sensitivity of immune enzyme detection in sera of ITB patients with migrating erythema of IgM and IgG reacting with DbpB antigen was 13.9 and 20.0%, respectively. Frequency of detection of IgM and IgG against DbpB in patient sera with disseminated ITB form was 15.7 and 43.8%, respectively. Specificity ofimmune enzyme detection ofantibodies against recombinant antigen DbpB in which sera of syphilis, rheumatoid arthritis patients and healthy donors used as control sera was 100%. Conclusion. DbpB recombinant protein of novosibirsk B. garinii 20047 isolate may be used as one of antigens for highly specific serodiagnostics of ITB disseminated stage.

About the authors

V. S Karavaev

Research Institute of Biochemistry, Novosibirsk, Russia

A. V Ryabchenko

Research Institute of Biochemistry, Novosibirsk, Russia

A. B Beklemishev

Research Institute of Biochemistry, Novosibirsk, Russia

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