Reaction catalyzed by tetrahydromethanopterin S-methyltransferase (2.1.1.86)

		+			=			+
	5-methyl-5,6,7,8-tetrahydromethanopterin	+		2-mercaptoethanesulfonate	=		5,6,7,8-tetrahydromethanopterin	+		2-(methylthio)ethanesulfonate