SGC 0946 is a potent small-molecule inhibitor of protein methyltransferase (PMT) DOT1L, a unique protein lysine methyltransferase (PKMT) catalyzing the methylation of histone H3 on Lysine 79 (H3K79), with the half maximal inhibition concentration IC50 value of 0.3 nM [1].
As a brominated analogue of EPZ004777, SGC 0946 exhibits substantially increased cellular inhibitory potency than its predecessor, where SGC 0946 reduces the methylation of H3K79 in both MCF10A (IC50: 8.8 nM) and A431 (IC50: 2.65 nM) cells compared with EPZ004777 (IC50: 84 nM and 264 nM respectively). This greatly increased cellular inhibitory potency of SGC 0946 can be attributed to lower off-rate and to improved cell permeability [1].
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References:
[1] Yu W, Chory EJ, Wernimont AK, Tempel W, Scopton A, Federation A, Marineau JJ, Qi J, Barsyte-Lovejoy D, Yi J, Marcellus R, Iacob RE, Engen JR, Griffin C, Aman A, Wienholds E, Li F, Pineda J, Estiu G, Shatseva T, Hajian T, Al-Awar R, Dick JE, Vedadi M, Brown PJ, Arrowsmith CH, Bradner JE, Schapira M. Catalytic site remodelling of the DOT1L methyltransferase by selective inhibitors. Nat Commun. 2012;3:1288. doi: 10.1038/ncomms2304.