Protein
5-hydroxybenzimidazole synthase
Organism
Desulfuromonas acetoxidans (strain DSM 684 / 11070)
Function
Catalyzes the complex conversion of aminoimidazole ribotide (AIR) to 5-hydroxybenzimidazole (5-HBI) in a radical S-adenosyl-L-methionine (SAM)-dependent reaction. Is thus involved in the anaerobic biosynthesis of dimethylbenzimidazole (DMB), the lower axial ligand of vitamin B12 (cobalamin).
Similarity
Belongs to the ThiC family. 5-hydroxybenzimidazole synthase subfamily.
Sequence
MKTQVEHAVDGIITEQMATVAHDEDLSPEYIRTMVAEGKIVIPNNSNSTPKPVGIGKGLRTKVNASIGTSSDIVNYQAEVRKARIAEQAGADTLMELSVGGNLDRVRREVLAAVNLPVGNVPLYQAFCDATRKYGSADKLDPEELFDLIEQQCEDGLAFMAIHCGINRYTIERLRKQHYRYGGLVSKGGTSMVSWMEHNNRENPLYEQFDRVVAILKKYDVCLSLGNGLRAGAIHDSHDRAQMQELIINCELAQLGREMGCQMLVEGPGHMPLDEVEANILIQKRMSNEAPYYMLGPISTDVVPGFDHISSAIGAAQSARYGADLICYITPAEHLALPNEDDVRSGVEAARVATYIGDMNKYPDKGRQRDKAMSKARRDLQWDKQFELALMPEQARQVRDSRLPEEEHSCTMCGNFCAANGSKTLFDGDLQGDKC