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脯氨酸脱氢酶(prolinedehydragenase，PDH，EC 1.5.1.2) 催化脯氨酸生成 Δ1-二氢吡咯-5-羧酸的反应，是脯氨酸降解过程的限速步骤。脯氨酸是分布最广泛的一种渗透物质，在胁迫条件下很多植物可以通过增加合成、减少降解而在体内累积大量脯氨酸，降低PDH活性对于防止渗透胁迫对植物造成伤害、保护细胞结构等方面具有重要意义。 脯氨酸脱氢酶(PDH)催化脯氨酸脱氢并使NAD⁺还原成NADH，通过检测NADH在340nm处的增加速率即可得出PDH酶活性大小。
Proline dehydrogenase (PDH, EC 1.5.1.2) catalyzes the reaction that converts proline to Δ1-pyrroline-5-carboxylate, serving as the rate-limiting step in the proline degradation pathway. Proline is the most widely distributed osmoregulatory substance; under stress conditions, many plants accumulate substantial amounts of proline by enhancing its synthesis and reducing its degradation. Decreasing PDH activity is of great significance for preventing osmotic stress damage to plants and protecting cellular structure. Proline dehydrogenase (PDH) catalyzes the dehydrogenation of proline while reducing NAD⁺ to NADH. The PDH enzyme activity can be determined by measuring the increase rate of NADH at 340 nm.
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