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Volume 77, Issue 1

Assessment of antigenicity and genetic variation of glycoprotein B of murine cytomegalovirus Free

Abstract

An analysis of linear antibody-binding sites of the glycoprotein B (gB) molecule of murine cytomegalovirus (MCMV) and of genetic variation within these regions was performed. To achieve this, a series of overlapping fragments spanning the entire coding sequence of the gene of the K181 strain of MCMV was expressed in as fusion proteins with glutathione -transferase (GST) using the pGEX expression system. Four antibody-binding regions were mapped to locations spanning amino acid residues 17–79 (BS), 155–278 (BE2), 809–926 (SS) and 347–508 (BB and EE), based on reactivity in Western blot analysis of GST-gB fusion proteins with murine polyclonal antiserum raised against MCMV. Only the antibody-binding region BE2 (155–278) elicited an antiserum that exhibited complement-dependent neutralizing activity, and immunization of mice with the fusion protein BE2 led to moderate but significant reductions in the level of MCMV replication in the spleen. Polyclonal antisera raised against the GST-gB fusion proteins detected purified virion proteins of 105 kDa (anti-BS and anti-BE2) and 52 kDa (anti-SS), and are therefore likely to recognize the N-terminal and C-terminal portions of the gB molecule, respectively. The antibody-binding region within amino acid residues 17–79 was found to be MCMV strain-specific, whereas antibody-binding regions within residues 155–278 and 809–926 were found to be conserved among MCMV field isolates. Comparative sequence analysis of the corresponding regions of MCMV gB revealed a level and extent of sequence heterogeneity consistent with these findings.

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© Journal of General Virology 1996
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1996-01-01
2024-04-16
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Assessment of antigenicity and genetic variation of glycoprotein B of murine cytomegalovirus
J. Gen. Virol. 77, 49 (1996); https://doi.org/10.1099/0022-1317-77-1-49
/content/journal/jgv/10.1099/0022-1317-77-1-49
/content/journal/jgv/10.1099/0022-1317-77-1-49
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