THE SIMIAN HERPESVIRUS SA8 HOMOLOG OF THE HERPES-SIMPLEX VIRUS GB GENE - MAPPING, SEQUENCING, AND COMPARISON TO THE HSV GB

被引:21
作者
EBERLE, R
BLACK, D
机构
[1] Department of Veterinary Parasitology, Microbiology, and Public Health, College of Veterinary, and Public Health, College of Veterinary MedicineDepartment of Veterinary Parasitology, Microbiology, and Public Health, College of Veterinary Medicine Oklahoma
关键词
D O I
10.1007/BF01311304
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The genomic location and DNA sequence of the simian herpesvirus SA8 gene encoding a homologue of the HSV1 gB glycoprotein was determined. Using a cloned gB gene of herpes simplex virus type 1 (HSV1) as probe in Southern blot hybridizations, the SA8 gB gene was localized to a 10-kbp Kpnl fragment mapping in the unique long part of the genome. A 2.8 kbp, 68.4% GC segment of this fragment was sequenced. It contained a 2649 nucleotide ORF possibly encoding a 98.4kDa polypeptide. The predicted amino acid sequence of the SA8 gB polypeptide is 78.4% and 78.9% identical to the sequence of the HSV1 and HSV2 gBs, respectively, and was 88.4% similar or identical to both HSV gB sequences. Structural characteristics predicted for the SA8 gB polypeptide were very similar to those of HSV1 gB. These included a hydrophobic signal sequence of 29 amino acids, conservation of all 10 cysteine residues and 5 of 6 potential N-linked glycosylation sites present in the HSV1 gB, a triple hydrophobic transmembrane domain, and a highly charged cytoplasmic tail region. Both hierarchical cluster analysis and phylogenetic analysis of sequences for gB polypeptides of 12 different herpesviruses demonstrated that the gB glycoprotein of SA8 is most closely related to the HSV gB glycoproteins. Comparison of these closely related gB sequences identified four regions in which non-conservative amino acid substitutions were clustered. Localized regions of the gB polypeptide were identified which are likely to be associated with the conserved structure/function of the polypeptide.
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页码:67 / 86
页数:20
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