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Discovery of Potent and Selective Inhibitors for G9a-Like Protein (GLP) Lysine Methyltransferase

Discovery of Potent and Selective Inhibitors for G9a-Like Protein (GLP) Lysine Methyltransferase

Yan Xiong, Fengling Li, Nicolas Babault, Aiping Dong, Hong Zeng, Hong Wu, Xin Chen, Cheryl H Arrowsmith, Peter J Brown, Jing Liu, Masoud Vedadi, Jian Jin

J Med Chem. 2017 Mar 9;60(5):1876-1891.

PMID: 28135087

Abstract:

G9a-like protein (GLP) and G9a are highly homologous protein lysine methyltransferases (PKMTs) sharing approximately 80% sequence identity in their catalytic domains. GLP and G9a form a heterodimer complex and catalyze mono- and dimethylation of histone H3 lysine 9 and nonhistone substrates. Although they are closely related, GLP and G9a possess distinct physiological and pathophysiological functions. Thus, GLP or G9a selective small-molecule inhibitors are useful tools to dissect their distinct biological functions. We previously reported potent and selective G9a/GLP dual inhibitors including UNC0638 and UNC0642. Here we report the discovery of potent and selective GLP inhibitors including 4 (MS0124) and 18 (MS012), which are >30-fold and 140-fold selective for GLP over G9a and other methyltransferases, respectively. The cocrystal structures of GLP and G9a in the complex with either 4 or 18 displayed virtually identical binding modes and interactions, highlighting the challenges in structure-based design of selective inhibitors for either enzyme.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2089617832	MS012		2089617-83-2	Price

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