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首页> 外文期刊>The FEBS journal >Isoprenoid biosynthesis in plants - 2C-methyl-D-erythritol-4-phosphate synthase (IspC protein) of Arabidopsis thaliana
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Isoprenoid biosynthesis in plants - 2C-methyl-D-erythritol-4-phosphate synthase (IspC protein) of Arabidopsis thaliana

机译:植物中类异戊二烯的生物合成-拟南芥的2C-甲基-D-赤藓糖醇-4-磷酸合酶(IspC蛋白)

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摘要

The ispC gene of Arabidopsis thaliana was expressed in pseudomature form without the putative plastid-targeting sequence in a recombinant Escherichia coli strain. The recombinant protein was purified by affinity chromatography and was shown to catalyze the formation of 2C-methyl-D-erythritol 4-phosphate from 1-deoxy-D-xylulose 5-phosphate at a rate of 5.6 micromol x min(-1) x mg(-1) (k(cat) 4.4 s(-1)). The Michaelis constants for 1-deoxy-D-xylulose 5-phosphate and the cosubstrate NADPH are 132 and 30 microm, respectively. The enzyme has an absolute requirement for divalent metal ions, preferably Mn2+ and Mg2+, and is inhibited by fosmidomycin with a Ki of 85 nm. The pH optimum is 8.0. NADH can substitute for NADPH, albeit at a low rate (14% as compared to NADPH). The enzyme catalyzes the reverse reaction at a rate of 2.1 micromol x min(-1) x mg(-1).
机译:在重组大肠杆菌菌株中拟南芥的ispC基因以假成熟形式表达,没有假定的质体靶向序列。重组蛋白通过亲和色谱纯化,并显示出可以以5.6 micromol x min(-1)x的速率催化1-脱氧-D-木酮糖5-磷酸形成2C-甲基-D-赤藓糖醇4-磷酸。 mg(-1)(k(cat)4.4 s(-1))。 1-脱氧-D-木酮糖5-磷酸和共底物NADPH的米氏常数分别为132和30微米。该酶绝对需要二价金属离子,最好是Mn2 +和Mg2 +,并被磷霉素的Ki值为85 nm抑制。最适pH为8.0。 NADH可以替代NADPH,尽管其转化率较低(相比NADPH为14%)。该酶以2.1 micromol x min(-1)x mg(-1)的速率催化逆反应。

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