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Cloning and expression of fragment of the rabies virus nucleoprotein gene in Escherichia coli and evaluation of antigenicity of the expression product.
Rabies virus nucleoprotein (N protein) encapsidates genomic RNA of the virus and forms the viral ribonucleoprotein complex. These N proteins represent highly organized structures which activate proliferation of B cells and production antibodies against the N protein. In addition to the B cell, the rabies virus N protein has been shown to induce potent T helper cell responses resulting in a long-lasting and strong humoral immune response. Rabies virus N protein is a molecular target of choice for development of tools to diagnose acute rabies infection. We produced a recombinant immune reactive C-terminal fragment of the rabies virus N protein which contains an antigenic determinant located between positions 360-389. Synthetic gene encoding the N protein was cloned into an expression plasmid to produce the recombinant antigen in Escherichia coli cells BL21 (DE3). SDS-PAGE showed presence of the product with expected molecular weight (44 kDa). The recombinant fragment of the N protein efficiently recognized antibodies in sera from mice immunized with an inactivated rabies virus. Thus produced recombinant antigen of the rabies virus N protein can be used in an enzyme-linked immunosorbent assay (ELISA) for diagnosis of the rabies infection.
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