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苹果酸酶（ME）广泛存在于微生物、培养细胞、动物和植物胞浆中，尤其在植物组织中活性较高。ME 催化苹果酸氧化脱羧的可逆反应，产生丙酮酸和 CO₂，以及伴随NAD(P)⁺的还原反应，是苹果酸代谢的关键酶。ME 活性与生物合成和抗氧化密切相关。根据辅酶专一性和对底物特异性的不同，可将 ME 分为 NAD-ME (EC1.1.1.38)和 NADP-ME (EC1.1.1.40)，其中NAD-ME能够催化NAD⁺还原成 NADH，在 340 nm 下测定 NADH 的增加速率可反映其活力。
Malic enzyme (ME) is widely present in the cytoplasm of microorganisms, cultured cells, animals, and plants, with particularly high activity in plant tissues. ME catalyzes the reversible oxidative decarboxylation of malate to produce pyruvate and CO₂, accompanied by the reduction of NAD(P)⁺, and is a key enzyme in malate metabolism. ME activity is closely related to biosynthesis and antioxidation. Based on differences in coenzyme specificity and substrate specificity, ME can be classified into NAD-ME (EC 1.1.1.38) and NADP-ME (EC 1.1.1.40). NAD-ME catalyzes the reduction of NAD⁺ to NADH, and its activity can be reflected by measuring the rate of increase in NADH at 340 nm.
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