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. 1992 May;66(5):3048–3055. doi: 10.1128/jvi.66.5.3048-3055.1992

Identification and characterization of pseudorabies virus glycoprotein H.

B G Klupp 1, N Visser 1, T C Mettenleiter 1
PMCID: PMC241065  PMID: 1313917

Abstract

On the basis of DNA sequence analysis, it has recently been shown that the pseudorabies virus (PrV) genome encodes a protein homologous to glycoprotein H (gH) of other herpesviruses (B. Klupp and T.C. Mettenleiter, Virology 182:732-741, 1991). To obtain antibodies specific for gH(PrV), rabbits were immunized with synthetic peptides representing two potential epitopes on gH(PrV) as predicted by computer analysis. The antipeptide sera recognized the gH precursor polypeptide pgH translated in vitro from an in vitro-transcribed mRNA. Western blot (immunoblot) analyses of purified pseudorabies virions using these antisera revealed specific reactivity with a protein with an apparent molecular mass of 95 kDa. Specificity of the reaction could be demonstrated by competition experiments with respective peptides. Analysis of PrV deletion mutants defective in genes encoding known glycoproteins proved that gH(PrV) constitutes a novel PrV glycoprotein not previously found. Treatment of purified virion preparations with endoglycosidase H reduced the apparent molecular mass of gH(PrV) to 90 kDa, indicating the presence of N-linked high-mannose (or hybrid) carbohydrates in mature virions. Removal of all N-linked carbohydrates by N-glycosidase F resulted in a product of 76 kDa. In summary, our results demonstrate the existence of gH in PrV as a structural component of the virion.

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