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天冬酰胺合成酶（AS，EC 6.3.5.4) 广泛存在于植物和微生物体内，是一个以氨或谷氨酰胺及天冬氨酸为底物催化合成天冬酰胺的关键酶，该酶对于研究植物营养有重要意义。天冬酰胺合成酶（AS) 催化谷氨酰胺的氨基转移到天冬氨酸形成天冬酰胺，同时生成谷氨酸；利用谷氨酸脱氢酶作用于生成的谷氨酸，同时使NAD⁺还原成NADH，通过测定NADH在340nm处的增加速率，进而得出天冬酰胺合成酶活性大小。 该酶催化反应：ATP+L-aspartate+L-glutamine+H₂O=AMP+diphosphate+L-asparagine+L-glutamate。
Asparagine Synthetase (AS, EC 6.3.5.4) is widely distributed in plants and microorganisms. It is a key enzyme that catalyzes the synthesis of asparagine using ammonia or glutamine and aspartate as substrates, and it holds significant importance for the study of plant nutrition. Asparagine Synthetase (AS) catalyzes the transfer of the amino group from glutamine to aspartate, forming asparagine and simultaneously producing glutamate. Glutamate dehydrogenase then acts on the generated glutamate, concurrently reducing NAD⁺ to NADH. By measuring the increase rate of NADH at 340 nm, the activity of Asparagine Synthetase can be determined. The enzymatic reaction is as follows: ATP + L-aspartate + L-glutamine + H₂O = AMP + diphosphate + L-asparagine + L-glutamate.
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