| Phylum | Alphaproteobacteria |
| Order | Rhizobiales |
| Organism | Methylocystis parvus |
| Hydrogenase | [NiFe] Group 3b |
| Activity (Predicted) | Bidirectional |
| Oxygen Tolerance (Predicted) | Tolerant |
| Subunits (Predicted) | 4 |
| Metal Centres (Predicted) | [NiFe]-centre, 3 x [4Fe4S] clusters |
| Accessory Subunits (Predicted) | Diaphorase, [FeS] protein |
MPSKTIKVDLLARVEGEGALKLVIRDGKVRRAEFNIFEPPRFFEAFLRGRHFTETPDIVARICGICPVAYQMSAVHALENLVGVSVDGPLRELRRLLYCGEWIESHVLHIYMLHAPDFLGYDGGVQMARDHGDAVKRGLQLKKVGNEILQLLGGREIHPINVRVGGFHRTPRKRELAPLAEKLKWAREAALETARWVATFDFPERERDYAFVTLNHATEYPFNEGRIVSNRGLDIAAAEYDEHFEESHVAHSTALHSRLKDGGGAYLTGPLARFNMCFAQLSPLAQQTAREIGLGESCRNPYRSIMVRAVETVYACDEALRVIENYEEPDTPCVAVQPRSGVGYAATEAPRGMLYHRYQIGDDGLIQDAQIVPPTSQNQACLEEDLIDFIGGFLDLPDKDLQYRAEQTVRNYDPCISCATHFLTLDIDRA