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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC

Accepted Name
5,6-dimethylbenzimidazole synthase.
Reaction catalysed
FMNH(2) + NADH + O(2) <=> 5,6-dimethylbenzimidazole + D-erythrose 4-phosphate + NAD(+) + other product(s)
  • The enzyme catalyzes a complex oxygen-dependent conversion of reduced flavin mononucleotide to form 5,6-dimethylbenzimidazole, the lower ligand of vitamin B12.
  • This conversion involves many sequential steps in two distinct stages, and an alloxan intermediate that acts as a proton donor, a proton acceptor, and a hydride acceptor.
  • The C-2 of 5,6-dimethylbenzimidazole is derived from C-1' of the ribityl group of FMNH(2) and 2-H from the ribityl 1'-pro-S hydrogen.
  • While D-erythrose 4-phosphate has been shown to be one of the byproducts, the nature of the other product(s) has not been verified yet.
  • Formerly EC
PRIAM enzyme-specific profiles1.13.11.79
KEGG Ligand Database for Enzyme Nomenclature1.13.11.79
IUBMB Enzyme Nomenclature1.13.11.79
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