| Role | Gene | Name | |
|---|
| Adenylylsulfate reductase alpha-subunit (EC 1.8.99.2) | No genes | | |
| Adenylylsulfate reductase beta-subunit (EC 1.8.99.2) | No genes | | |
| Anaerobic dehydrogenases, typically selenocysteine-containing | No genes | | |
| Anaerobic dimethyl sulfoxide reductase chain A (EC 1.8.99.-) | No genes | | |
| Anaerobic dimethyl sulfoxide reductase chain B (EC 1.8.99.-) | No genes | | |
| Anaerobic dimethyl sulfoxide reductase chain C (EC 1.8.99.-) | No genes | | |
| Anaerobic sulfite reductase subunit A | No genes | | |
| Anaerobic sulfite reductase subunit B | No genes | | |
| Anaerobic sulfite reductase subunit C (EC 1.8.1.-) | No genes | | |
| Arsenate reductase (EC 1.20.4.1) | MMP_RS02590 | | |
| Butyryl-CoA dehydrogenase (EC 1.3.99.2) | No genes | | |
| CoB--CoM heterodisulfide reductase 2 iron-sulfur subunit D (EC 1.8.98.1) | No genes | | |
| CoB--CoM heterodisulfide reductase 2 subunit E (EC 1.8.98.1) | No genes | | |
| CoB--CoM heterodisulfide reductase subunit A (EC 1.8.98.1) | MMP_RS04295 | | |
| | MMP_RS08740 | | |
| CoB--CoM heterodisulfide reductase subunit B (EC 1.8.98.1) | MMP_RS05445 | | |
| | MMP_RS05960 | | |
| CoB--CoM heterodisulfide reductase subunit C (EC 1.8.98.1) | MMP_RS05450 | | |
| | MMP_RS05955 | | |
| CoB--CoM heterodisulfide reductase subunit D (EC 1.8.98.1) | No genes | | |
| CoB--CoM-reducing hydrogenase (Cys) delta subunit | MMP_RS04275 | | |
| Coenzyme F420-dependent oxidoreductase | No genes | | |
| Dissimilatory sulfite reductase (desulfoviridin), alpha and beta subunits | MMP_RS00450 | | |
| Electron transfer flavoprotein-ubiquinone oxidoreductase (EC 1.5.5.1) | No genes | | |
| F420-dependent sulfite reductase | No genes | | |
| Fe-S-cluster-containing hydrogenase components 1 | No genes | | |
| Ferredoxin reductase | No genes | | |
| Ferric reductase (1.6.99.14) | No genes | | |
| Flavodoxin reductases (ferredoxin-NADPH reductases) family 1 | No genes | | |
| Formate dehydrogenase -O, gamma subunit (EC 1.2.1.2) | No genes | | |
| Heterodisulfide reductase, cytochrome reductase subunit | No genes | | |
| Heterodisulfide reductase, subunit A | No genes | | |
| Polysulfide reductase, subunit A, putative | No genes | | |
| Polysulfide reductase, subunit B, putative | No genes | | |
| Polysulfide reductase, subunit C, putative | No genes | | |
| Sulfite reductase alpha subunit (EC 1.8.99.1) | No genes | | |
| Sulfite reductase beta subunit (EC 1.8.99.1) | No genes | | |
| Sulfite reductase, dissimilatory-type gamma subunit (EC 1.8.99.3) | No genes | | |
| Thiosulfate reductase cytochrome B subunit | No genes | | |
| Thiosulfate reductase electron transport protein phsB | No genes | | |
| Thiosulfate reductase precursor (EC 1.-.-.-) | No genes | | |
| Uncharacterized component of anaerobic dehydrogenases | No genes | | |
| Vanillate O-demethylase oxidoreductase (EC 1.14.13.-) | No genes | | |
| heterodisulfide reductase, iron-sulfur binding subunit, putative | No genes | | |
| heterodisulfide reductase, subunit A/methylviologen reducing hydrogenase, subunit delta | No genes | | |
| heterodisulfide reductase, subunit E, putative | No genes | | |
| polysulfide reductase, subunit A | No genes | | |
| polysulfide reductase, subunit B | No genes | | |
| polysulfide reductase, subunit C | No genes | | |