| Phylum | Firmicutes |
| Order | Clostridiales |
| Organism | Ruminiclostridium leptum |
| Hydrogenase | [FeFe] Group A3 |
| Activity (Predicted) | Bifurcating |
| Oxygen Tolerance (Predicted) | Labile |
| Subunits (Predicted) | 4 |
| Metal Centres (Predicted) | [FeFe]-centre, 2 x [4Fe4S] clusters |
| Accessory Subunits (Predicted) | NADH dehydrogenase, thioredoxin, thioredoxin |
MVAAIADPKKHVVVQTAPSVRAALGEEFGMPIGTNVEGKMVAALRRLGFDKVFDTDFGADMTIMEEAHEFIDRVQNGGVLPLITSCSPGWIKFCEFYYPELLPNLSSCKSPQQMQGALIKTWYAETHNIDPKDIVSVSVMPCTAKKFEISRDDENAAGVPDVDVVLTVRELARMIKRANIDLTMLPDEKFDPTMDVSTGAAVIFGATGGVMEAALRTAADTLTGKSLDSIDYEEVRGTDGIKEAVYNVAGMDVKVAVASGLSNANEILKKVKNGEADYHFIEIMCCPGGCVNGGGMPIQPSSVRNFVDIRKERAKVLYEEDKNLPLRKSHDNPVVKKCYAEYLGEPGSHKAHEILHTTYTPRPKMK