title: Genus specific features of bovine papillomavirus E6, E7, E5 and E8 proteins.
abstract: Six bovine papillomavirus (BPV) types, BPV-1 to -6, have been classified in genera Delta-papillomavirus (BPV-1 and -2), Epsilon-papillomavirus (BPV-5) and Xi-papillomavirus (BPV-3, -4 and -6). In addition, 16 unclassified putative BPV types have been reported. In the present study, we characterized genus specific features of E6, E7, E5 (formerly E8) and E8 proteins of seven putative BPV types, BAPV-1, -2, -3, -4 and -10, BAA-5 and BPV-3c. These putative BPV types were classified in genera Epsilon- or Xi-papillomavirus. The E6 proteins of BPV and putative BPV types in Epsilon-papillomavirus showed high sequence similarities, and contained two typical zinc-binding domains. However, E7 proteins contained atypical zinc-binding domains, and lacked the canonical retinoblastoma tumor suppressor protein (pRB)-binding motif. BPV and putative BPV types in Xi-papillomavirus contained E5 or E8 open reading frame (ORF) in the E6 position. The E5 ORFs encoded proteins consist of 42-amino acid with a hydrophobic transmembrane and a hydrophilic C-terminal domain. But the E8 ORFs encoded protein which have two transmembrane domains. Our results demonstrated that E5, E8, E6, E7 proteins of the putative BPV types, which are presumably classified in genera Epsilon- or Xi-papillomavirus, retained the some genus specific features.
authors.affiliation: Department of Molecular Virology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuou-ku, Chiba 260-8670, Japan. tomita@faculty.chiba-u.jp
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Tomita
authors.forename: Tomoko
authors.initials: T
authors.lastname: Ogawa
authors.forename: Zhongri
authors.initials: Z
authors.lastname: Jin
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shirasawa
mesh_terms: D020816:Amino Acid Motifs / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics; D002417:Cattle; D002418:Cattle Diseases / Q000821:virology; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics; D023061:Gene Order; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000737:chemistry / Q000235:genetics*; D016366:Open Reading Frames; D027383:Papillomaviridae / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D030361:Papillomavirus Infections / Q000662:veterinary / Q000821:virology; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D002352:Carrier Proteins; D004279:DNA, Viral; D009856:Oncogene Proteins, Viral; C017800:zinc-binding protein