The Enzyme Database

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Accepted name: dihydromethanopterin reductase [NAD(P)+]
Reaction: 5,6,7,8-tetrahydromethanopterin + NAD(P)+ = 7,8-dihydromethanopterin + NAD(P)H + H+
For diagram of methanopterin biosynthesis (part 4), click here
Other name(s): DmrA; H2MPT reductase; 5,6,7,8-tetrahydromethanopterin 5,6-oxidoreductase; dihydromethanopterin reductase
Systematic name: 5,6,7,8-tetrahydromethanopterin:NAD(P)+ 5,6-oxidoreductase
Comments: The enzyme, characterized from the bacterium Methylobacterium extorquens, is involved in biosynthesis of dephospho-tetrahydromethanopterin. The specific activity with NADH is 15% of that with NADPH at the same concentration [1]. It does not reduce 7,8-dihydrofolate (cf. EC, dihydrofolate reductase).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Caccamo, M.A., Malone, C.S. and Rasche, M.E. Biochemical characterization of a dihydromethanopterin reductase involved in tetrahydromethanopterin biosynthesis in Methylobacterium extorquens AM1. J. Bacteriol. 186 (2004) 2068–2073. [DOI] [PMID: 15028691]
[EC created 2013, modified 2014]

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