B12 binding domain of corrinoid proteins. A family of small methanogenic corrinoid proteins that bind methyl-Co(III) 5-hydroxybenzimidazolylcobamide as a cofactor. They play a role on the methanogenesis from trimethylamine, dimethylamine or monomethylamine, which is initiated by a series of corrinoid-dependent methyltransferases.
Jiyao W et al.(2023). "The conserved domain database in 2023.",