Fig. 4
From: Complete genome sequence of Methanospirillum hungatei type strain JF1
Overview of central metabolism in M. hungatei strain JF1. The pathway for methane formation from hydrogen and formate is shown in black with key steps shown with gene/enzyme designations. Membrane proteins involved in energy transduction electron transport, and ion/solute translocation are arranged along the cytoplasmic membrane: archaeal ATP synthase, Aha; formate dehydrogenases, Fdh; hydrogenases (Mbh, Ech, Ehr, Eha Frh); formyl-methanofuran dehydrogenase, Fmd, Fwd; methenyl–H4MPT tetrahydromethanopterin cyclohydrolyase, Mch; formylMFR:tetrahydromethanopterin formyl transferase, Ftr; methylene–H4MPT dehydrogenase, Mtd; methylene–H4MPT reductase, Mer; H4MPT S-methyltransferase (Mtr; methyl-CoM reductasem Mcr; and CoM-S-S-CoB heterodisulfide reductase, Hdr