ID 2.1.1.245 DE 5-methyltetrahydrosarcinapterin:corrinoid/iron-sulfur protein DE Co-methyltransferase. CA 5,6,7,8-tetrahydrosarcinapterin + methyl-Co(III)-[corrinoid Fe-S protein] CA = 5-methyltetrahydrosarcinapterin + Co(I)-[corrinoid Fe-S protein] + CA H(+). CC -!- Catalyzes the transfer of a methyl group from the cobamide cofactor CC of a corrinoid/Fe-S protein to the N5 group of CC tetrahydrosarcinapterin. CC -!- Forms, together with EC 1.2.7.4 and EC 2.3.1.169 the acetyl-CoA CC decarbonylase/synthase complex that catalyzes the demethylation of CC acetyl-CoA in a reaction that also forms CO2. CC -!- This reaction is a key step in methanogenesis from acetate. DR Q8PZ09, ACDG1_METMA; Q50539, ACDG1_METTE; Q8PV87, ACDG2_METMA; DR Q9C4Z0, ACDG2_METTE; O29871, ACDG_ARCFU ; Q8TH44, ACDG_METAC ; DR Q57576, ACDG_METJA ; Q8TXF1, ACDG_METKA ; O27748, ACDG_METTH ; //