Objective To identify a novel retinoblastoma protein(RB)-associated protein(RBAP 96)and to explore the impact of RBAP96 on radiosensitivity of human breast cancer cells.Methods An in vivo and in vitro association of RBAP96 with RB was determined by immunoprecipitation-Western blotting and GST pull-down assay.Protein expression was measured by Western blot assay.Cellular survival was evaluated by using a colony formation assay.Results In both in vitro and in vivo assays,we found that the RBAP96 and RB interaction required a 513LXCXE517 motif on the RBAP96 protein and an intact A/B binding pocket of RB.RBAP96 enhances RB-mediated transcriptional repression.Finally,enforced expression of RBAP96 caused an elevated radiosensitivity of human breast cancer cells bearing wtRB,but did not affect radiosensitivity of breast cancer cells bearing mutant RB.Expression of a full-length RBAP96 with an 513LXCXE517 inactivating mutation(LXCXE→RXRXH) failed to result in any radiosensitivity alteration.Conclusion This study f

作者：Junling Zhang；Xiaolei Xue；Qinghui Meng；Lu Lu；Ming Cui；Saijun Fan

来源：国际放射医学核医学杂志 2016 年 40卷 5期