Identification of the first small-molecule inhibitor of the REV7 DNA repair protein interaction
作者:Marcelo L. Actis、Nigus D. Ambaye、Benjamin J. Evison、Youming Shao、Murugendra Vanarotti、Akira Inoue、Ezelle T. McDonald、Sotaro Kikuchi、Richard Heath、Kodai Hara、Hiroshi Hashimoto、Naoaki Fujii
DOI:10.1016/j.bmc.2016.07.026
日期:2016.9
DNA interstrand crosslink (ICL) repair (ICLR) has been implicated in the resistance of cancer cells to ICL-inducing chemotherapeutic agents. Despite the clinical significance of ICL-inducing chemotherapy, few studies have focused on developing small-molecule inhibitors for ICLR. The mammalian DNA polymerase zeta, which comprises the catalytic subunit REV3L and the non-catalytic subunit REV7, is essential for ICLR. To identify small-molecule compounds that are mechanistically capable of inhibiting ICLR by targeting REV7, high-throughput screening and structure-activity relationship (SAR) analysis were performed. Compound 1 was identified as an inhibitor of the interaction of REV7 with the REV7-binding sequence of REV3L. Compound 7 (an optimized analog of compound 1) bound directly to REV7 in nuclear magnetic resonance analyses, and inhibited the reactivation of a reporter plasmid containing an ICL in between the promoter and reporter regions. The normalized clonogenic survival of HeLa cells treated with cisplatin and compound 7 was lower than that for cells treated with cisplatin only. These findings indicate that a small-molecule inhibitor of the REV7/REV3L interaction can chemosensitize cells by inhibiting ICLR. (C) 2016 Elsevier Ltd. All rights reserved.