title: Mutational analysis of bovine papillomavirus type 1 E5 peptide domains involved in induction of cellular DNA synthesis.
abstract: Early gene E5 of bovine papillomavirus type 1 encodes a 44-amino-acid protein whose expression can transform immortalized mouse cell lines. We have previously reported that a chemically synthesized E5 peptide functions to induce cellular DNA synthesis upon microinjection into growth-arrested mouse cells. We further defined the two E5 domains essential for the full DNA synthesis induction activity by the analysis of E5 deletion and amino acid substitution mutant peptides. The first domain is the C-terminal 13-amino-acid core which is sufficient to activate DNA synthesis at high peptide concentration and contains two essential, highly conserved cysteine residues. The second domain is the 7-amino-acid hydrophobic sequence contiguous to the core domain which is sufficient to confer a 1,000-fold higher molar specific activity to the E5 peptide. A random hydrophobic sequence, but not charged amino acids, fulfills the function of the second domain.
authors.affiliation: Institute for Molecular Virology, St. Louis University Medical Center, Missouri 63110.
authors.forename: J A
authors.initials: JA
authors.lastname: Rawls
authors.forename: P M
authors.initials: PM
authors.lastname: Loewenstein
authors.forename: M
authors.initials: M
authors.lastname: Green
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D052688:Bovine papillomavirus 1 / Q000235:genetics*; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D004261:DNA Replication; D051379:Mice; D008969:Molecular Sequence Data; D009154:Mutation; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D027383:Papillomaviridae / Q000235:genetics*; D013936:Thymidine / Q000378:metabolism
chemical_list: D009856:Oncogene Proteins, Viral; C054304:oncogene protein E5, Bovine papillomavirus type 1; D013936:Thymidine