Crystallographic Investigation and Selective Inhibition of Mutant Isocitrate Dehydrogenase
作者:Baisong Zheng、Yuan Yao、Zhen Liu、Lisheng Deng、Justin L. Anglin、Hong Jiang、B. V. Venkataram Prasad、Yongcheng Song
DOI:10.1021/ml400036z
日期:2013.6.13
Mutations in isocitrate dehydrogenase (IDH), a key enzyme in the tricarboxylic acid cycle, have recently been found in similar to 75% glioma and similar to 20% acute myeloid leukemia. Different from the wild-type enzyme, mutant IDH1 catalyzes the reduction of alpha-ketoglutaric acid to D-2-hydroxyglutaric acid. Strong evidence has shown mutant IDH1 represents a novel target for this type of cancer. We found two 1-hydroxypyridin-2-one compounds that are potent inhibitors of R132H and R132C mutants with K-i values as low as 120 nM. These compounds exhibit >60-fold selectivity against wild-type IDH1 and can inhibit the production of D-2-hydroxyglutaric acid in IDH1 mutated cells, representing novel chemical Probes for cancer biology studies. We also report the first inhibitor-bound crystal structures of IDH1(R132H), showing these inhibitors have H-bond, electrostatic, and hydrophobic interactions with the mutant enzyme. Comparison with the substrate-bound IDH1 structures revealed the structural basis for the high enzyme selectivity of these compounds.