The FTR (Formylmethanofuran--tetrahydromethanopterin formyltransferase) enzyme EC:2.3.1.101 is involved in archaebacteria in the formation of methane from carbon dioxide. C-terminal proximal lobe of alpha+beta ferredoxin-like fold. SCOP reports fold duplication with N-terminal distal lobe.

1: Formylmethanofuran: tetrahydromethanopterin formyltransferase from Methanopyrus kandleri - new insights into salt-dependence and thermostability. Ermler U, Merckel M, Thauer R, Shima S; Structure 1997;5:635-646. PMID:9195883