A-196 (1982372-88-2) is a potent and selective (over 29 other methyltransferases) inhibitor of the protein lysine methyltransferases SUV420H1(IC50 = 25 nM) and SUV420H2 (IC50 = 144 nM). It substantially inhibited non-homologous end-joining (NHEJ)-directed DNA repair but not homology-directed repair(HDR) in cells treated with ionizing radiation. A-196 is active in cells and displayed no toxicity in several cell lines.
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