Co(I)-[methylated-thiol-specific corrinoid protein] + methyl-coenzyme M + H(+) => methyl-Co(III)-[methylated-thiol-specific corrinoid protein] + coenzyme M
co(i)-[methylated-thiol-specific corrinoid protein] + methyl-coenzyme m + h(+) => methyl-co(iii)-[methylated-thiol-specific corrinoid protein] + coenzyme m