Table 3.
Nomenclature.
| Central methanogenic pathway | |
| Fmd | Formylmethanofuran (CHO-MFR) dehydrogenase |
| Ftr | Formylmethanofuran-tetrahydromethanopterin (H4MPT) formyltransferase |
| Mch | N5,N10-methenyl-H4MPT cyclohydrolase |
| Mtd | F420H2-dependent methylene -H4MPT dehydrogenase |
| Mer | N5,N10-methylene-H4MPT reductase |
| Mtr | N5-methyl-H4MPT:coenzyme M (CoM) methyltransferase |
| Mcr | Methyl coenzyme M (CH3-CoM) reductase |
| Mdh | Methanol dehydrogenase |
| Fae/Hps | Fusion protein of formaldehyde activating enzyme/ hexulose-6-phosphate synthase |
| MetF | N5,N10-methylene tetrahydrofolate (H4HF) reductase analogue |
| Electron transport | |
| Mvh | F420-nonreducing hydrogenase |
| Vho | Methanophenazine-dependent hydrogenase |
| Fpo | F420H2:phenazine oxidoreductase |
| Fqo | F420H2:quinone oxidoreductase |
| Hdr | Coenzyme B-coenzyme M heterodisulfide (CoB-S-S-CoM) reductase |
| Frh | F420-dependent hydrogenase |
| Ech | Ferredoxin-dependent hydrogenase |
| MePh/MePhH2 | Methanophenazine |
| MQ/MQH2 | Menaquinone |
| Cyt b | Cytochrome b |
| Cyt c | Cytochrome c |
| MHC | Multiheme c-type cytochrome |
| Rieske | Rieske cytochrome b complex |
| Orf7 | Pseudoperiplasmic b-type cytochrome |
| Nar | Nitrate reductase |
| Nap | Periplasmic nitrate reductase |
| Nrf | Nitrite reductase |