This entry was last updated at: Feb. 9, 2018, 7:34 a.m.
| Group | [NiFe] Group 3: Cofactor-coupled bidirectional [NiFe] hydrogenases |
| Subgroup | [NiFe] Group 3b: NADP-coupled |
| Function | Directly couples oxidation of NADPH to fermentative evolution of H2. Reverse reaction may also occur. Some complexes controversially proposed to harbour sulfhydrogenase activity. |
| Activity | Bidirectional |
| Oxygen tolerance | O2-tolerant |
| Localisation | Cytosolic |
| Ecosystem distribution | Diverse soil and aquatic environments |
| Taxonomic distribution | Encoded in multiple diverse bacterial and archaeal phyla |
e.g. Pyrococcus furiosus (WP_011012029.1):
| Structures |
|
| Subunits | 4 |
| Subunit description | HyhL (hydrogenase large subunit) HyhS (hydrogenase small subunit) HyhG (diaphorase catalytic subunit) HyhB (diaphorase electron transfer subunit) |
| Catalytic site | [NiFe]-centre |
| FeS clusters | Proximal: 4Cys[4Fe4S] Medial: 4Cys[4Fe4S] Distal: 4Cys[4Fe4S] |
| NCBI Accession | Organism | Hydrogenase Class | Phylum | Order | Activity (Predicted) | Oxygen Tolerance (Predicted) | Subunits (Predicted) | Metal Centres (Predicted) | Accessory Subunits (Predicted) |
|---|---|---|---|---|---|---|---|---|---|
| WP_029912396.1 | Pelobacter seleniigenes | [NiFe] Group 3b | Deltaproteobacteria | Desulfuromonadales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_029915222.1 | Pelobacter seleniigenes | [NiFe] Group 3b | Deltaproteobacteria | Desulfuromonadales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_048088262.1 | Methanoperedens nitroreducens | [NiFe] Group 3b | Euryarchaeota | Methanosarcinales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_048090768.1 | Methanoperedens nitroreducens | [NiFe] Group 3b | Euryarchaeota | Methanosarcinales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
Genetics:
Physiology:
Biochemistry:
Chemistry: