The Enzyme Database

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Accepted name: 1-deoxy-D-xylulose-5-phosphate reductoisomerase
Reaction: 2-C-methyl-D-erythritol 4-phosphate + NADP+ = 1-deoxy-D-xylulose 5-phosphate + NADPH + H+
For diagram of non-mevalonate terpenoid biosynthesis, click here
Other name(s): DXP-reductoisomerase; 1-deoxy-D-xylulose-5-phosphate isomeroreductase; 2-C-methyl-D-erythritol 4-phosphate (MEP) synthase
Systematic name: 2-C-methyl-D-erythritol-4-phosphate:NADP+ oxidoreductase (isomerizing)
Comments: The enzyme requires Mn2+, Co2+ or Mg2+ for activity, with the first being most effective. The enzyme from several eubacteria, including Escherichia coli, forms part of an alternative nonmevalonate pathway for terpenoid biosynthesis (for diagram, click here). The mechanism has been shown to be a retroaldol/aldol reaction [2].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 210756-42-6
1.  Takahashi, S., Kuzuyama, T., Watanabe, H. and Seto, H.   A 1-deoxy-D-xylulose 5-phosphate reductoisomerase catalyzing the formation of 2-C-methyl-D-erythritol 4-phosphate in an alternative nonmevalonate pathway for terpenoid biosynthesis. Proc. Natl. Acad. Sci. USA 95 (1998) 9879–9884. [PMID: 9707569]
2.  Munos, J.W., Pu, X., Mansoorabadi, S.O., Kim, H.J. and Liu, H.W. A secondary kinetic isotope effect study of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase-catalyzed reaction: evidence for a retroaldol-aldol rearrangement. J. Am. Chem. Soc. 131 (2009) 2048–2049. [PMID: 19159292]
[EC created 2001]

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