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Seroreactive recombinant herpes simplex virus type 2-specific glycoprotein G.

Triton Biosciences Inc., Alameda, California 94501.

ABSTRACT

The herpes simplex virus type 2 (HSV-2) genome codes for an envelope protein, glycoprotein G (gG), which contains predominantly type 2-specific epitopes. A portion of this gG gene has been expressed as a fusion protein in Escherichia coli. Expression was regulated by a lambda phage pL promoter. The 60,000-molecular-weight recombinant protein was purified by ion-exchange chromatography. Amino acid sequence analysis confirmed the N terminus of the purified protein. Mice immunized with recombinant gG developed antibodies reactive with native HSV-2 protein, but not with HSV-1 protein, in an indirect immunofluorescence assay. The serological activity of this purified recombinant gG protein was evaluated by immunoblot assay. This protein was reactive with an HSV-2 gG monoclonal antibody. It was also reactive with HSV-2 rabbit antiserum but not with HSV-1 rabbit antiserum. Of 15 patient serum samples known to have antibody to HSV-2, 14 were reactive with this recombinant type 2-specific gG protein, and none of 15 HSV antibody-negative patient serum samples showed reactivity. In agreement with the expected prevalence of HSV-2 infection, 27.6% of 134 serum samples from random normal individuals had antibodies reactive with recombinant gG. This recombinant gG protein may be of value in detecting HSV-2-specific antibody responses in patients infected with HSV-2.

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