V8彩票

羟脯氨酸生产厂家富阳东辰生物工程是一家羟脯氨酸生产企业,主营羟基脯氨酸,提供羟脯氨酸与脯氨酸价格、报价业务!

— V8彩票 —

  • 植物体内合成脯氨酸的有两条途径
  • 本站编辑:浙江省富阳东辰生物工程有限公司发布日期:2019-06-13 16:31 浏览次数:

V8彩票一是通过过谷氨酸途径,二是通过鸟氨酸途径。其中,谷氨酸途径在渗透胁迫和氮素不足情况下占主要地位;鸟氨酸途径在氮素充足情况下占主导地位。谷氨酸途径中,谷氨酸(Glu)在吡咯啉-5-羧酸合成酶(P5CS)催化下生成谷氨酰半醛(GSA),GSA自动环化为吡咯啉-5-羧酸(P5C),然后P5C在吡咯啉5-羧酸还原酶(P5CR)作用下生成脯氨酸。而鸟氨酸途径与谷氨酸途径在反应上的不同仅仅是第一步反应的底物和酶发生了变化,即由Glu和P5CS换成了鸟氨酸(Orn)和鸟氨酸转氨酶(OAT)。脯氨酸的降解过程基本上是合成途径的逆转。脯氨酸首先被脯氨酸脱氢酶(PDH)氧化成P5C,后者在吡咯啉-5-羧酸脱氢酶的作用下生成Glu。高等植物体内脯氨酸合成与降解途径.

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One through the glutamate pathway and the other through the ornithine pathway. Glutamate pathway plays the main role in osmotic stress and nitrogen deficiency. The ornithine pathway plays a dominant role in nitrogen abundance. In the glutamate pathway, glutamic acid (Glu) is catalyzed by pyrropridine 5-carboxylic acid synthetase (P5CS) to generate glutamyl semi-aldehyde (GSA), which is automatically cycled to pyrropridine 5-carboxylic acid (P5C), and then P5C is cycled to proline under the action of pyrropridine 5-carboxylic acid reductase (P5CR). The difference between the ornithine pathway and the glutamate pathway in the reaction is only that the substrate and enzyme of the first step of the reaction change, namely, from Glu and P5CS to ornithine (Orn) and ornithine transaminase (OAT). The degradation of proline is basically a reversal of the synthetic pathway. Proline is first oxidized to P5C by proline dehydrogenase (PDH), which generates Glu under the action of pyrrolidine -5- carboxylic acid dehydrogenase. Pathway of proline synthesis and degradation in higher plants.


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