title: Interaction of E1 and hSNF5 proteins stimulates replication of human papillomavirus DNA.
abstract: Mammalian viruses often use components of the host's cellular DNA replication machinery to carry out replication of their genomes, which enables these viruses to be used as tools for characterizing factors that are involved in cellular DNA replication. The human papillomavirus (HPV) E1 protein is essential for replication of the virus DNA. Here we identify the cellular factor that participates in viral DNA replication by using a two-hybrid assay in the yeast Saccharomyces cerevisiae and E1 protein as bait. Using this assay, we isolated Inil/hSNF5, a component of the SWI/SNF complex which facilitates transcription by altering the structure of chromatin. In vitro binding and immunoprecipitation confirmed that E1 interacts directly with Ini1/hSNF5. Transient DNA-replication assay revealed that HPV DNA replication is stimulated in a dose-dependent manner by addition of Ini1/hSNF5, and that Ini1/hSNF5 antisense RNA blocks the replication of HPV DNA. Amino-acid substitution at residues that are conserved among E1 proteins prevented the E1-Ini1/hSNF5 interaction and reduced DNA replication of HPV in vivo. Our results indicate that Ini1/hSNF5 is required for the efficient replication of papillomavirus DNA and is therefore needed, either alone or in complex with SWI/SNF complex, for mammalian DNA replication as well.
authors.affiliation: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon.
authors.forename: D
authors.initials: D
authors.lastname: Lee
authors.forename: H
authors.initials: H
authors.lastname: Sohn
authors.forename: G V
authors.initials: GV
authors.lastname: Kalpana
authors.forename: J
authors.initials: J
authors.lastname: Choe
mesh_terms: D001665:Binding Sites; D002843:Chromatin / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone; D004279:DNA, Viral / Q000096:biosynthesis*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D016297:Mutagenesis, Site-Directed; D009856:Oncogene Proteins, Viral / Q000378:metabolism*; D027383:Papillomaviridae / Q000502:physiology*; D011485:Protein Binding; D016372:RNA, Antisense / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D000071796:SMARCB1 Protein; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D014162:Transfection; D014407:Tumor Cells, Cultured; D014764:Viral Proteins / Q000378:metabolism; D014779:Virus Replication
chemical_list: D002843:Chromatin; D002868:Chromosomal Proteins, Non-Histone; D004279:DNA, Viral; D004268:DNA-Binding Proteins; C084304:E1 protein, Human papillomavirus type 11; D009856:Oncogene Proteins, Viral; D016372:RNA, Antisense; D011993:Recombinant Fusion Proteins; D000071796:SMARCB1 Protein; C513266:SMARCB1 protein, human; C066190:SNF5 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D014764:Viral Proteins; C084762:oncogene protein E1, Human papillomavirus type 18