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[formula: see text] The stereochemistry of the 1-deoxy-D-xylulose 5-phosphate (DXP) isomeroreductase reduction step has been examined using the recombinant enzyme from Synechocystis sp. PCC6803. Using [3-2H]DXP and [4S-2H]NADPH, it has been determined that the C1 pro-S hydrogen in the 2-C-methyl-D-erythritol 4-phosphate product derives from C3 of DXP, indicating that hydride attack occurs on the re face of the intermediate aldehyde. The 4S-hydride from NADPH is delivered, assigning this enzyme as a class B dehydrogenase. 相似文献
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