Structure‐Guided Synthesis and Evaluation of Small‐Molecule Inhibitors Targeting Protein–Protein Interactions of BRCA1 tBRCT Domain
作者:Vadiraj Kurdekar、Saranya Giridharan、Jasti Subbarao、Mamatha B. Nijaguna、Jayaprakash Periasamy、Sanjana Boggaram、Amol V. Shivange、Gayathri Sadasivam、Muralidhara Padigaru、Vijay Potluri、Ashok R. Venkitaraman、Kavitha Bharatham
DOI:10.1002/cmdc.201900300
日期:2019.9.18
effective in abrogating BRCA1 foci formation and inhibiting G2 arrest induced by irradiation of cells. Collectively, our findings reveal structural features underlying the activity of a novel inhibitor of phosphopeptide recognition by the BRCA1 tBRCT domain, providing fresh insights to guide the development of inhibitors that target protein-protein interactions.
BRCA1的串联BRCT结构域(tBRCT)结合靶蛋白中的含磷酸丝氨酸的基序,以传播由DNA损伤引发的细胞内信号,从而控制细胞周期停滞和DNA修复。最近,我们确定了Bractoppin,BRCA1 tBRCT域的第一个小分子抑制剂,该抑制剂选择性地中断DNA损伤引起的BRCA1介导的细胞反应。在这里,我们结合结构指导的化学精制,蛋白质诱变和细胞分析来定义负责Bractoppin活性的结构特征。Bractoppin无法结合BRCA1 tBRCT的突变形式,该突变形式带有K1702A,介导磷酸肽识别的关键残基,或邻接pSer识别位点的F1662R或L1701K。但是,M1775R突变与共有磷酸肽基序pSer-XX-Phe中的Phe残基结合,不会影响Bractoppin的结合,从而证实了与底物磷酸肽结合不同的结合方式。我们在生化分析中通过结构指导的化学加工和表征的构效关系(SAR)探索了这些结构