| Phylum | Euryarchaeota |
| Order | Thermococcales |
| Organism | Pyrococcus abyssi |
| Hydrogenase | [NiFe] Group 4d |
| Activity (Predicted) | Evolving |
| Oxygen Tolerance (Predicted) | Sensitive |
| Subunits (Predicted) | 13 |
| Metal Centres (Predicted) | [NiFe]-centre, 1 x [4Fe4S] clusters |
| Accessory Subunits (Predicted) | NuoL, NuoH, NuoC, two [FeS] proteins, seven MRP antiporter subunits, etc. |
MSKVEYWVKVPFGPIHPGLEEPEKFILTLDGERIVNVDVKLGYNLRGIQWIAFRRNYVQLMYVAERICGICSFSHNHTYVRAVEEMAGIEVPERAEYIRVIIGELERIHSHLLNLGVLGHDIGYDTVLHLTWLAREKVMDVLEAITGNRVNYSMMTIGGVRRDIEEKHRRLLLDMIKYYREIMPQIEDVFLHDSTIEARLRNCAIIPKKLAIEMGAVGPTGRGSGVRDDARWSEKLGVYPDLGIKPIMPEDVTGEKARGDVYDRAAVRIGEIWQSLELIEHALDQIPKGKIKTFPKDNVLVAKLKLLGDGEGIGRYEAPRGELVHYVKGKKGRDGPVRWKMREPTFPNLFAIAKGLEGNQLADVVVAIASIDPCLSCTDRVAVITGDKKVILTEKDLLKLSIQKTREINPEIRGDPTPAGVGCVRG