| Role | Gene | Name | |
|---|
| Coenzyme F420 hydrogenase beta subunit (FruB) (EC 1.12.98.1) | No genes | | |
| Coenzyme F420 hydrogenase maturation protease (EC 3.4.24.-) | No genes | | |
| Coenzyme F420-reducing hydrogenase, alpha subunit | No genes | | |
| Coenzyme F420-reducing hydrogenase, beta subunit | No genes | | |
| Coenzyme F420-reducing hydrogenase, gamma subunit | No genes | | |
| Fe-S-cluster-containing hydrogenase components 1 | No genes | | |
| Fe-S-cluster-containing hydrogenase components 2 | No genes | | |
| Methanophenazine hydrogenase cytochrome b subunit (EC 1.12.98.3) | No genes | | |
| Methanophenazine hydrogenase large subunit (EC 1.12.98.3) | No genes | | |
| Methanophenazine hydrogenase small subunit precursor (EC 1.12.98.3) | No genes | | |
| NAD-reducing hydrogenase subunit HoxE (EC 1.12.1.2) | No genes | | |
| NAD-reducing hydrogenase subunit HoxF (EC 1.12.1.2) | No genes | | |
| NAD-reducing hydrogenase subunit HoxH (EC 1.12.1.2) | No genes | | |
| NAD-reducing hydrogenase subunit HoxU (EC 1.12.1.2) | No genes | | |
| NAD-reducing hydrogenase subunit HoxY (EC 1.12.1.2) | No genes | | |
| NADH-reducing hydrogenase maturation factor | No genes | | |
| NADP-reducing hydrogenase, subunit A | No genes | | |
| NADP-reducing hydrogenase, subunit B | No genes | | |
| NADP-reducing hydrogenase, subunit C | No genes | | |
| Ni,Fe-hydrogenase I cytochrome b subunit | SO2726 | | |
| | SO4483 | | |
| Ni,Fe-hydrogenase I large subunit | No genes | | |
| Ni,Fe-hydrogenase III large subunit | No genes | | |
| Ni,Fe-hydrogenase III small subunit | No genes | | |
| Ni,Fe-hydrogenase maturation factor | No genes | | |
| Ni/Fe-hydrogenase 2 B-type cytochrome subunit | No genes | | |
| Nickel-dependent hydrogenase, large subunit | No genes | | |
| Nickel-dependent hydrogenase, small subunit | No genes | | |
| Periplasmic [Fe] hydrogenase (EC 1.12.7.2) | No genes | | |
| Periplasmic [Fe] hydrogenase large subunit (EC 1.12.7.2) | SO3920 | hydA | |
| Periplasmic [Fe] hydrogenase small subunit (EC 1.12.7.2) | SO3921 | hydB | |
| Probable Ni/Fe-hydrogenase 2 B-type cytochrome subunit | No genes | | |
| Protein hydE | SO2095 | | |
| Quinone-reactive Ni/Fe hydrogenase, cytochrome b subunit | SO2097 | hydC | |
| Quinone-reactive Ni/Fe-hydrogenase large chain (EC 1.12.5.1) | SO2098 | hyaB | |
| Quinone-reactive Ni/Fe-hydrogenase small chain precursor (EC 1.12.5.1) | SO2099 | hoxK | |
| Signal transduction histidine kinase HoxJ (hydrogenase regulation) | No genes | | |
| Signal transduction histidine kinase for Quinone-reactive Ni/Fe-hydrogenase | SO2105 | | |
| Sulfhydrogenase II subunit a | No genes | | |
| Sulfhydrogenase II subunit b | No genes | | |
| Sulfhydrogenase II subunit d | No genes | | |
| Sulfhydrogenase II subunit g | No genes | | |
| Uptake hydrogenase large subunit (EC 1.12.99.6) | No genes | | |
| Uptake hydrogenase small subunit precursor (EC 1.12.99.6) | No genes | | |
| [Fe] hydrogenase gamma (EC 1.12.7.2) | No genes | | |
| [Fe] hydrogenase, HymA subunit, putative | No genes | | |
| [Fe] hydrogenase, HymB subunit, putative | No genes | | |
| [Fe] hydrogenase, HymD subunit, putative | No genes | | |
| [Ni/Fe] hydrogenase, group 1, large subunit | No genes | | |
| [Ni/Fe] hydrogenase, group 1, small subunit | No genes | | |
| cytochrome-c3 hydrogenase alpha chain | No genes | | |
| cytochrome-c3 hydrogenase delta chain | No genes | | |
| cytochrome-c3 hydrogenase gamma chain | No genes | | |
| heterodisulfide reductase, subunit A/methylviologen reducing hydrogenase, subunit delta | No genes | | |
| hydrogenase (cytochrome-c3 hydrogenase beta chain) | No genes | | |
| hydrogenase, (NiFe)/(NiFeSe) small subunit family | No genes | | |
| hydrogenase, methyl-violgen-reducing type, delta subunit | No genes | | |
| hydrogenase, subunit gamma related protein | No genes | | |
| hydrogenase/sulfur reductase, alpha subunit | No genes | | |
| hydrogenase/sulfur reductase, beta subunit | No genes | | |
| hydrogenase/sulfur reductase, delta subunit | No genes | | |
| hydrogenase/sulfur reductase, gamma subunit | No genes | | |
| methyl viologen-reducing hydrogenase, delta subunit homolog FlpD | No genes | | |
| quinone-reactive Ni/Fe-hydrogenase, small subunit | No genes | | |