Targeting Phosphopeptide Recognition by the Human BRCA1 Tandem BRCT Domain to Interrupt BRCA1-Dependent Signaling
作者:Jayaprakash Periasamy、Vadiraj Kurdekar、Subbarao Jasti、Mamatha B. Nijaguna、Sanjana Boggaram、Manjunath A. Hurakadli、Dhruv Raina、Lokavya Meenakshi Kurup、Chetan Chintha、Kavyashree Manjunath、Aneesh Goyal、Gayathri Sadasivam、Kavitha Bharatham、Muralidhara Padigaru、Vijay Potluri、Ashok R. Venkitaraman
DOI:10.1016/j.chembiol.2018.02.012
日期:2018.6
triggered by DNA breakage flow through proteins containing BRCT (BRCA1 C-terminal) domains. This family, comprising 23 conserved phosphopeptide-binding modules in man, is inaccessible to small-molecule chemical inhibitors. Here, we develop Bractoppin, a drug-like inhibitor of phosphopeptide recognition by the human BRCA1 tandem (t)BRCT domain, which selectively inhibits substrate binding with nanomolar potencyin vitro
由 DNA 断裂触发的细胞内信号流经含有 BRCT(BRCA1 C 末端)结构域的蛋白质。这个家族包含 23 个在人体中保守的磷酸肽结合模块,小分子化学抑制剂无法使用。在这里,我们开发了 Bractoppin,这是一种人类 BRCA1 串联 (t)BRCT 结构域对磷酸肽识别的类药物抑制剂,它在体外选择性地抑制底物与纳摩尔效价的结合。结构-活性探索表明,Bractoppin 与 BRCA1 tBRCT 残基结合,识别共有基序中的 pSer,pSer-Pro-Thr-Phe,加上在结构相关的 BRCT 结构域中不同的邻接疏水袋,赋予选择性。在细胞中,Bractoppin 抑制 Förster 共振能量转移检测到的底物识别,并减少 BRCA1 对 DNA 断裂的募集,反过来抑制损伤诱导的 G2 停滞和重组酶 RAD51 的组装。但损伤诱导的 MDC1 募集、单链 DNA (ssDNA) 生成和