The enzyme tetrahydromethanopterin S-methyltransferase EC:2.1.1.86 is composed of eight subunits [1]. The enzyme is a membrane- associated enzyme complex which catalyses an energy-conserving, sodium-ion-translocating step in methanogenesis from hydrogen and carbon dioxide [1].

1: The energy conserving N5-methyltetrahydromethanopterin:coenzyme M methyltransferase complex from Methanobacterium thermoautotrophicum is composed of eight different subunits. Harms U, Weiss DS, Gartner P, Linder D, Thauer RK; Eur J Biochem 1995;228:640-648. PMID:7737157