5,6-dimethylbenzimidazole synthase activity
Catalysis of the reaction: FMNH2 + O2 = 5,6-dimethylbenzimidazole + D-erythrose 4-phosphate + dialuric acid.
GO:0016702
oxidoreductase activity, acting on single donors with incorporation of molecular oxygen, incorporation of two atoms of oxygen
is_a