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G9a and G9a-like protein (GLP) are euchromatic histone-lysine methyltransferases (EHMT2 and EHMT1, respectively) that can heterodimerize with each other to methylate several proteins in addition to histone H3. UNC0646 is a potent and selective inhibitor of G9a and GLP activities in vitro (IC50s = 6 and 15 nM, respectively) and G9a/GLP-mediated dimethylation of histone 3 on lysine 9 in MDA-MB-231 cells (IC50 = 26 nM).1 It is highly selective for G9a/GLP over several other protein lysine and arginine methyltransferases.1 UNC0646 potently inhibits G9a/GLP activity in a variety of cancer cell lines as well as in the human fetal lung IMR-90 line.1 This compound selectively targets the corepressor function of G9a without affecting its ability to act as a coactivator with glucocorticoid receptor.2
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1. Optimization of cellular activity of G9a inhibitors 7-
2. G9a functions as a molecular scaffold for assembly of transcriptional coactivators on a subset of glucocorticoid receptor target genes. Proc. Natl. Acad. Sci. USA 109(48), 19673-19678 (2012).