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线粒体异柠檬酸脱氢酶即 NAD-异柠檬酸脱氢酶(NAD-IDH EC 1.1.1.41)广泛存在于动物、植物和培养细胞的线粒体中,在三羧酸循中催化异柠檬酸生成α-酮戊二酸,同时将NAD⁺还原为 NADH,是三羧酸循环的限速酶之一,其催化的反应是细胞 NADH 主要来源之一。 NAD-异柠檬酸脱氢酶催化NAD⁺还原生成NADH,导致340nm处光吸收上升,进而得出NAD-IDH酶活性的大小。
Mitochondrial isocitrate dehydrogenase, also known as NAD-dependent isocitrate dehydrogenase (NAD-IDH, EC 1.1.1.41), is widely found in the mitochondria of animals, plants, and cultured cells. In the tricarboxylic acid (TCA) cycle, it catalyzes the conversion of isocitrate to α-ketoglutarate while simultaneously reducing NAD⁺ to NADH. As one of the rate-limiting enzymes of the TCA cycle, the reaction it catalyzes serves as a major source of cellular NADH. NAD-dependent isocitrate dehydrogenase catalyzes the reduction of NAD⁺ to NADH, leading to an increase in light absorption at 340 nm, which allows for the determination of NAD-IDH enzyme activity.