MDH2（malate dehydrogenase 2），癌症关联基因，基因ID：4191，苹果酸脱氢酶在柠檬酸循环中利用NAD/NADH辅因子体系催化苹果酸对草酰乙酸的可逆氧化。由该基因编码的蛋白质定位于线粒体，可能在苹果酸-天冬氨酸穿梭中发挥关键作用，在细胞溶胶和线粒体之间的代谢协调中起作用已经发现了一些编码不同亚型的转录变体。[由RefSeq提供，2013年9月]Malate dehydrogenase catalyzes the reversible oxidation of malate to oxaloacetate， utilizing the NAD/NADH cofactor system in the citric acid cycle. The protein encoded by this gene is localized to the mitochondria and may play pivotal roles in the malate-aspartate shuttle that operates in the metabolic coordination between cytosol and mitochondria. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq， Sep 2013]。