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J Virol. 1987 February; 61(2): 326-335

Structure and expression of the herpes simplex virus type 2 glycoprotein gB gene.

L L Stuve, S Brown-Shimer, C Pachl, R Najarian, D Dina and R L Burke

ABSTRACT

The gene for glycoprotein gB2 of herpes simplex virus type 2 strain 333 was cloned, sequenced, and expressed in mammalian cells. The gB2 protein had an overall nucleotide and amino acid sequence homology of 86% with the cognate gB1 protein. However, of the 125 amino acid substitutions or deletions, only 12.5% were conservative replacements. These differences were clustered within an NH2-terminal region, a central region, and a COOH-terminal region, resulting in domains of near identity broken by small regions of marked divergence. Regions of greatest homology included a 90-amino-acid stretch starting at residue 484 and 39 amino acids spanning residues 835 to 873, which cover a rate-of-entry locus mapped to Ala-552 and a syn locus mapped to Arg-857, respectively, in gB1 by Bzik et al. (D. J. Bzik, B. A. Fox, N. A. DeLuca, and S. Person, Virology 133:301-314, 1984). Pellett et al. (P. E. Pellett, K. G. Kousoulas, L. Pereira, and B. Roizman, J. Virol. 53:243-253, 1985) mapped the mutations in three monoclonal antibody-resistant gB1 mutants between amino acids 273 and 443. These epitopes are included in a region of 98 residues identical between gB1 and gB2. The identity of this protein was verified by placing a truncated gene lacking the 303 carboxyl-terminal amino acids of gB2 into mammalian COS and CHO cells. Expression was demonstrated by immunofluorescence and radioimmunoprecipitation. This protein will be purified from the stable CHO cell lines and compared with gB1 for immunogenicity and protective efficacy in animal challenge models.

J Virol. 1987 February; 61(2): 326-335




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