期刊
FEBS JOURNAL
卷 273, 期 19, 页码 4446-4458出版社
WILEY
DOI: 10.1111/j.1742-4658.2006.05446.x
关键词
deoxyxylulose; dimethylallyl diphosphate; herbicide; isopentenyl diphosphate; terpene
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 mu mol.min(-1).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 mu M, respectively. The enzyme has an absolute requirement for divalent metal ions, preferably Mn2+ and Mg2+, and is inhibited by fosmidomycin with a K-i 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 mu mol.min(-1).mg(-1).
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