| Phylum | Firmicutes |
| Order | Clostridiales |
| Organism | Acetobacterium woodii |
| Hydrogenase | [FeFe] Group A4 |
| Activity (Predicted) | Bifurcating |
| Oxygen Tolerance (Predicted) | Labile |
| Subunits (Predicted) | 6 |
| Metal Centres (Predicted) | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster |
| Accessory Subunits (Predicted) | NADP dehydrogenase, four FeS proteins |
MIINIDKEICTGCRECAEVCPVSAIEGEPGKGQEINYDKCVMCGQCVQKCKSYVSIVDHGVKAYERKRQERNLPASIKEPLFAAYNNCNLDKVKAALADPDVITMVQCAPAVRVGIAEDFGAELGTVAAGKLAAALHKIGFDRVYDTNFTADLTIMEEGTELIKRITEGAGKLPMFTSCCPAWVTFLERNYPDQKDHLSTCKSPQQMGAIFKTYGAKLDNYDPAKIFTVSVMPCTCKEFECNREEMNSSGYQDIDVAITTRELAYLIKDMDIDFNALADEDFDQPLGEYTGAGTIFGVTGGVMEAAIRTGYELITGKPIPDIDVSAVRGSNAFRTATLKVGDLDLKVGIVTGLANVIPVMEDLKAGKLDLHFIEVMTCPVGCVSGGGQPKLLLDSEKEAAYESRTKGIYTHDAELPIRKSHENPAITKIYEEYLLSPNGKESHHMLHTHYGTGENSFQK