5,6-dimethylbenzimidazole synthase

5,6-dimethylbenzimidazole synthase (EC 1.14.99.40, BluB) is an enzyme with systematic name FMNH2 oxidoreductase (5,6-dimethylbenzimidazole forming).[1][2][3] This enzyme catalyses the following chemical reaction

FMNH2 + NADH + H+ + O2 5,6-dimethylbenzimidazole + D-erythrose 4-phosphate + NAD+ + other product
5,6-dimethylbenzimidazole synthase
Identifiers
EC number1.14.99.40
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum

The C-2 of 5,6-dimethylbenzimidazole is derived from C-1' of the ribityl group of FMNH2 and 2-H from the ribityl 1'-pro-S hydrogen. This enzyme is part of the biosynthetic pathway to cobalamin (vitamin B12) in bacteria.

See also

References

  1. Gray MJ, Escalante-Semerena JC (February 2007). "Single-enzyme conversion of FMNH2 to 5,6-dimethylbenzimidazole, the lower ligand of B12". Proceedings of the National Academy of Sciences of the United States of America. 104 (8): 2921–6. doi:10.1073/pnas.0609270104. PMC 1815282. PMID 17301238.
  2. Ealick SE, Begley TP (March 2007). "Biochemistry: molecular cannibalism". Nature. 446 (7134): 387–8. doi:10.1038/446387a. PMID 17377573.
  3. Taga ME, Larsen NA, Howard-Jones AR, Walsh CT, Walker GC (March 2007). "BluB cannibalizes flavin to form the lower ligand of vitamin B12". Nature. 446 (7134): 449–53. doi:10.1038/nature05611. PMC 2770582. PMID 17377583.
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