作者: Chuangui Wang , Frank J. Rauscher , W. Douglas Cress , Jiandong Chen
关键词: Histone H3 、 Corepressor 、 E2F1 、 Molecular biology 、 Histone deacetylase complex 、 Biology 、 Ring finger 、 E2F1 Transcription Factor 、 Transcription (biology) 、 Retinoblastoma protein
摘要: KAP1 is a nuclear corepressor with conserved domains for RING finger, B boxes, leucine zipper α helical coiled-coil region, plant homeo domain and bromo domain. The finger of cooperatively function as transcription repression by recruiting the histone deacetylase complex NuRD H3 lysine 9-specific methyltransferase SETDB1. Here we report that binds E2F1 factor in retinoblastoma protein (pRb)-independent fashion inhibits activity. stimulates formation E2F1-HDAC1 acetylation. Ectopic expression represses apoptosis functions independent pRb. Depletion endogenous pRb-deficient Saos2 cells RNA interference increases acetylation level, transcriptional activity, sensitizes response to DNA damage. Therefore, contributes negative regulation may serve partial backup prevent E2F1-mediated absence