Identification and characterization of bovine herpesvirus type 5 glycoprotein H gene and gene products.
Bovine herpesvirus type 5 (BHV-5) is the causative agent of a fatal meningo-encephalitis in calves and is closely related to BHV-1 which causes infectious bovine rhinotracheitis. The gene encoding BHV-5 glycoprotein gH was sequenced. A high degree of conservation was found between BHV-1 and BHV-5 deduced gH amino acid sequences (86. 4%), which is also observed for all alphaherpesvirus gH sequences. Transcriptional analysis revealed a 3.1 kb mRNA as the specific gH transcript which was detected 2 h post-infection (p.i.). Twelve out of twenty-one MAbs directed against BHV-1 gH immunoprecipitated a 108-110 kDa glycoprotein, which was then designated BHV-5 gH. Synthesis and intracellular processing of BHV- 5 gH was analysed in infected MDBK cells using gH cross-reacting MAbs. Glycoprotein gH was expressed as a beta-gamma protein, detected by radioimmunoprecipitation as early as 3 h p.i. Glycosylation studies indicated that BHV-5 gH contains N-linked carbohydrates which are essential for the recognition of the protein by the MAbs. This suggests that N-linked glycans are involved in protein folding or are targets for the gH cross-reacting MAbs. Plaque- reduction neutralization assays showed that at least one BHV-1 gH antigenic domain is lacking in BHV-5 which may possibly relate to in vivo differences in virus tropism.
Meyer
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G
Department of Virology, Faculty of Veterinary Medicine, University of Liège, Bd de Colonster 20, Bat B43b, B-4000 Liège, Belgium 1.
Bare
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O
Department of Virology, Faculty of Veterinary Medicine, University of Liège, Bd de Colonster 20, Bat B43b, B-4000 Liège, Belgium 1.
Thiry
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E
Department of Virology, Faculty of Veterinary Medicine, University of Liège, Bd de Colonster 20, Bat B43b, B-4000 Liège, Belgium 1.
D018138:Alphaherpesvirinae / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015152:Blotting, Northern; D002417:Cattle; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics* / Q000276:immunology
D000911:Antibodies, Monoclonal; D014759:Viral Envelope Proteins