Protein: Multifunctional fusion protein [Includes: Tetrahydromethanopterin S-methyltransferase subunit G (EC 7.2.1.4) (N5-methyltetrahydromethanopterin--coenzyme M methyltransferase subunit G); Tetrahydromethanopterin S-methyltransferase subunit A (N5-methyltetrahydromethanopterin--coenzyme M methyltransferase subunit A)]