IUBMB Enzyme Nomenclature


Accepted name: tetramethylammonium—corrinoid protein Co-methyltransferase

Reaction: tetramethylammonium + a [(Co(I) tetramethylammonium-specific corrinoid protein] = a [methyl-Co(III) tetramethylammonium-specific corrinoid protein] + trimethylamine

Other name(s): mtqB (gene name); tetramethylammonium methyltransferase

Systematic name: tetramethylammonium:5-hydroxybenzimidazolylcobamide Co-methyltransferase

Comments: The enzyme, which catalyses the transfer of a methyl group from tetramethylammonium to a tetramethylammonium-specific corrinoid protein (MtqC), is involved in methanogenesis from tetramethylammonium. Methylation of the corrinoid protein requires the central cobalt to be in the Co(I) state. During methylation the cobalt is oxidized to the Co(III) state. The methylated corrinoid protein is substrate for EC, methylated tetramethylammonium-specific corrinoid protein:coenzyme M methyltransferase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Asakawa, S., Sauer, K., Liesack, W. and Thauer, R.K. Tetramethylammonium:coenzyme M methyltransferase system from methanococcoides s. Arch. Microbiol. 170 (1998) 220-226. [PMID: 9732435]

[EC created 2012]

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