2.1.1.252 tetramethylammonium + a [Co(I) tetramethylammonium-specific corrinoid protein] - Methanosarcina barkeri a [methyl-Co(III) tetramethylammonium-specific corrinoid protein] + trimethylamine - ? 419140 2.1.1.252 tetramethylammonium + a [Co(I) tetramethylammonium-specific corrinoid protein] - Methanosarcina barkeri NaT1 a [methyl-Co(III) tetramethylammonium-specific corrinoid protein] + trimethylamine - ? 419140