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An allosteric PRC2 inhibitor targeting the H3K27me3 binding pocket of EED

Qi, Vicky and Zhao, Kehao and Gu, Justin and Huang, Ying and Wang, Youzhen and Zhang, Hailong and Zhang, Maya and Zhang, Jeff and Yu, Zhengtian and Li, Ling and Teng, Lin and Chuai, Shannon and Zhang, Chao and Zhao, Mengxi and Chen, Zijun and Fang, Douglas and Fei, Qi and Feng, Leying and Feng, Lijian and Gao, Yuan and Ge, Hui and Ge, Xinjian and Li, Guobin and Lingel, Andreas and Lin, Ying and Liu, Yueqin and Luo, Fangjun and Shi, Minlong and Wang, Long and Wang, Zhaofu and Yu, Yanyan and Zeng, Jue and Zeng, Chenhui and Chen, Ho Man and Zhang, Lijun and Zhang, Qiong and Zhou, Shaolian and Oyang, Counde and Atadja, Peter and Li, En (2017) An allosteric PRC2 inhibitor targeting the H3K27me3 binding pocket of EED. Nature Chemical Biology.

Abstract

Polycomb repressive complex 2 (PRC2) consists of three core subunits, EZH2, EED and SUZ12 and plays pivotal roles in transcriptional regulation. The catalytic subunit EZH2 methylates histone H3 lysine 27 (H3K27) and its activity is further enhanced by the binding of EED to trimethylated H3K27 (H3K27me3). Small molecule inhibitors that compete with the cofactor Sadenosylmethionine (SAM) have been reported. Here we report the discovery of EED226, a potent and selective PRC2 inhibitor directly binding to the H3K27me3 binding pocket of EED. EED226 induces conformational change upon binding EED leading to loss of PRC2 activity. EED226 shows similar activity as SAM-competitive inhibitors in blocking H3K27 methylation of PRC2 target genes and inducing regression of human lymphoma xenograft tumors. Interestingly, EED226 also effectively inhibits PRC2 containing mutant EZH2 protein resistant to SAM-competitive inhibitors. Together, we show EED226 inhibits PRC2 activity via an allosteric mechanism and offers opportunity for treatment of PRC2-dependent cancers.

Item Type: Article
Date Deposited: 21 Dec 2016 00:45
Last Modified: 21 Dec 2016 00:45
URI: https://oak.novartis.com/id/eprint/29971

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