title: BRCA1 associates with human papillomavirus type 18 E2 and stimulates E2-dependent transcription.
abstract: BRCA1 is a breast and ovarian cancer-related tumor suppressor and has a role in transcriptional activation. We show here that BRCA1 enhances human papillomavirus type 18 (HPV-18) E2-dependent transcription in vivo. Using biochemical approaches, we discovered that BRCA1 interacts with the carboxyl-terminus of HPV-18 E2 protein in vivo and in vitro. Point mutations in the C-terminus make BRCA1 defective in transcriptional activation in E2-dependent transcription. This finding suggests that the C-terminus of BRCA1 is important for E2-dependent transcription. A chromatin immunoprecipitation assay indicated that BRCA1 is recruited onto the E2-dependent promoter region though E2 tethered to E2 binding sites in vivo. These results implicate that BRCA1 plays a role in E2-dependent transcription.
authors.affiliation: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.
authors.forename: Jiyun
authors.initials: J
authors.lastname: Kim
authors.forename: Daeyoup
authors.initials: D
authors.lastname: Lee
authors.forename: Sun
authors.initials: S
authors.lastname: Gwan Hwang
authors.forename: Eun-Seong
authors.initials: ES
authors.lastname: Hwang
authors.forename: Joonho
authors.initials: J
authors.lastname: Choe
mesh_terms: D019313:BRCA1 Protein / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D002460:Cell Line; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D009856:Oncogene Proteins, Viral / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D017434:Protein Structure, Tertiary; D015534:Trans-Activators / Q000378:metabolism*; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured
chemical_list: D019313:BRCA1 Protein; D009856:Oncogene Proteins, Viral; D015534:Trans-Activators; C069102:oncogene protein E2, Human papillomavirus type 18