| Phylum | Euryarchaeota |
| Order | Methanococcales |
| Organism | Methanocaldococcus infernus |
| Hydrogenase | [NiFe] Group 4h |
| Activity (Predicted) | Evolving |
| Oxygen Tolerance (Predicted) | Sensitive |
| Subunits (Predicted) | 20 |
| Metal Centres (Predicted) | [NiFe]-centre, 1 x [4Fe4S] clusters |
| Accessory Subunits (Predicted) | NuoH, NuoL, Two polyferredoxins, eleven TM proteins, three hypotheticals |
MPTIPIGPIHPALKEPMRIKLVLEGERPVDVELEMGYAHRGIEKIMEGKHCHKAIHLAERVCGICSNVHTHTFAQCVEKISKIEVPDKAKYLRVVIYELERIHSHLLAISTYCLAIEHETLGLWLLNIREPIMDLFELITGNRINLSFNVIGGVRKDITKEMAEEIIDKINSIKEDVENVMNAFEKAPLVGLRSKGIGVLKYKDIMKTRAVGPIARASGLPESDWRLRKKIYKELKFKVKWRKEGDNFARTMVRFEEILESIRLVEKALEHYLECSGDYRVRAEIKAGEGEVRNEAHRGEVLYQMAITSGGIVKKINIRTPSVMNFESYKYMIKTCPTVADAVATYVTTDPCVACAERAIYIVKDGKIYQYRR