| Phylum | Firmicutes |
| Order | Thermoanaerobacterales |
| Organism | Caldanaerobacter subterraneus |
| Hydrogenase | [FeFe] Group C3 |
| Activity (Predicted) | Sensory |
| Oxygen Tolerance (Predicted) | Labile |
| Subunits (Predicted) | 2 |
| Metal Centres (Predicted) | [FeFe]-centre, 2 x [4Fe4S] clusters, PAS domain |
| Accessory Subunits (Predicted) | Phosphatase |
MVSPMVAHARSLKQRYGLDIKVVFIGPCIAKKAEALDRSVLGDVDAVLTFQELADWIDEKASAVAGVDFGERENVLEPFIARSYPLPGGLLKTSSMEGDLLSREVVVVDGIENCMELLDALEMENVSGRIFEMMACRGGCINGPSMPCDSSLYERRERLLSFIENNQQQQGYENIKASAAGIDLRRSFEPKAFKAPRPTESEIREILASIGKTTPEKELNCGACGYPSCRKKAEAVYHGMAEPDMCIPYMRSRAESLANLIIDHTPNGIILVDSNLNIKEINRAAEKMFGVEKEQVQGKPLFTVIDDRDFAWVLANKTNLQDKKVNYPRNSLTTLQTMCYIEEEDMVLAIIQDITEQEKQRMELERVREETLEKAQEVINRQMRVAQEIAGLLGETTAESKMLLLKLIELVKGREEEK