IDH1 is one of three isocitrate dehydrogenases that catalyze the oxidative decarboxylation of isocitrate to α-ketoglutarate (α-KG). These enzymes exist in two distinct subclasses that utilize either NAD or NADP+ respectively, as an electron acceptor. IDH1 is the NADP+-dependent isocitrate dehydrogenase found in the cytoplasm and peroxisomes.
