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Version 2014-12-22
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Details for methylthiol:coenzyme M methyltransferase activity
2.1.1.251
Gene ontology ID
GO:0044683
Definition
Catalysis of the overall reaction: methyl-Co(III) methylated-thiol-specific corrinoid protein + coenzyme M = Co(I) methylated--thiol-specific corrinoid protein + methyl-CoM
Comment
This reaction is achieved by the catalysis of two successive steps carried out by the same enzyme - the transfer of a methyl group from the substrate to the cobalt cofactor of a methylated-thiol-specific corrinoid protein (MtsB), and the subsequent transfer of the methyl group from the corrinoid protein to coenzyme M. With most other methanogenesis substrates this process is carried out by two different enzymes (for example, EC 2.1.1.90, methanol-corrinoid protein Co-methyltransferase, and EC 2.1.1.246, methylated methanol-specific corrinoid protein:coenzyme M methyltransferase). The cobalt is oxidized during methylation from the Co(I) state to the Co(III) state, and is reduced back to the Co(I) form during demethylation.
References
1. MetaCyc RXN-8125
2. PMID 9371433
3. EC 2.1.1.251
4. RHEA: 32670
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