title: A bovine papillomavirus E1-related protein binds specifically to bovine papillomavirus DNA.
abstract: The E1 open reading frame of bovine papillomavirus (BPV) was expressed as a RecA-E1 fusion protein in Escherichia coli. The bacterially expressed RecA-E1 protein exhibited sequence-specific DNA binding activity; strong binding to the region from nucleotides 7819 to 93 on the BPV genome (designated region A) and weak binding to the adjacent region from nucleotides 7457 to 7818 (region B) were observed. The interaction between the BPV-derived RecA-E1 protein and region A appeared to be highly specific for BPV DNA, as no comparable binding was detected with heterologous papillomavirus DNAs. Binding to region A was eliminated by digestion of region A at the unique HpaI site, which suggests that the RecA-E1 binding site(s) was at or near the HpaI recognition sequence. Binding to region B but not region A was observed when nuclear extracts from ID13 cells were used as a source of E1 proteins. The absence of region A binding by ID13 extracts may reflect a negative regulation of E1 DNA binding activity.
authors.affiliation: Department of Medical Microbiology and Immunology, Texas A&M University, College Station 77843.
authors.forename: V G
authors.initials: VG
authors.lastname: Wilson
authors.forename: J
authors.initials: J
authors.lastname: Ludes-Meyers
mesh_terms: D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D015153:Blotting, Western; D052688:Bovine papillomavirus 1 / Q000235:genetics* / Q000378:metabolism; D002460:Cell Line; D003001:Cloning, Molecular; D003062:Codon; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D005814:Genes, Viral; D007106:Immune Sera; D007700:Kinetics; D016366:Open Reading Frames; D010957:Plasmids; D011993:Recombinant Fusion Proteins / Q000302:isolation & purification / Q000378:metabolism; D014764:Viral Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D003062:Codon; D004279:DNA, Viral; D004268:DNA-Binding Proteins; C069814:E1 protein, Bovine papillomavirus; D007106:Immune Sera; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins