Catalysis of the reaction: a [methyl-Co(III) methanol-specific corrinoid protein] + coenzyme M = methyl-coenzyme M + a [Co(I) methanol-specific corrinoid protein] + H+.
Catalysis of the reaction: [methyl-Co(III) methylamine-specific corrinoid protein] + coenzyme M = [Co(I) methylamine-specific corrinoid protein] + H+ + methyl-coenzyme M. This reaction is the transfer of the methyl group from the methylated corrinoid cofactor of a methylamine corrinoid protein to coenzyme M.
The dark-staining region of a sarcomere, in which myosin thick filaments are present; the center is traversed by the paler H zone, which in turn contains the M line.