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| Pseudomonas stutzeri A1501 | Bacteria | Ni | user | urease subunit alpha | YP_001174194.1 | | PDB BLAST (NCBI) | STRING search |
| Pseudomonas syringae pv. tomato str. DC3000 | Bacteria | Ni | user | urease subunit alpha | NP_794629.1 | | PDB BLAST (NCBI) | STRING search |
| Pseudomonas syringae pv. tomato str. DC3000 | Bacteria | Ni | user | urease subunit alpha | | | PDB BLAST (NCBI) | STRING search |
| Psychrobacter cryohalolentis K5 | Bacteria | Ni | user | urease subunit alpha | YP_580147.1 | | PDB BLAST (NCBI) | STRING search |
| Psychrobacter cryohalolentis K5 | Bacteria | Ni | user | urease subunit alpha | YP_580251.1 | | PDB BLAST (NCBI) | STRING search |
| Psychroflexus torquis ATCC 700755 | Bacteria | Ni | user | Ni SodN | ZP_01254046.1 | | PDB BLAST (NCBI) | STRING search |
| Psychromonas ingrahamii 37 | Bacteria | Ni | user | Ni-Fe hydrogenase, large subunit | YP_942646.1 | | PDB BLAST (NCBI) | STRING search |
| Psychromonas ingrahamii 37 | Bacteria | Ni | user | urease subunit alpha | YP_944295.1 | | PDB BLAST (NCBI) | STRING search |
| Psychromonas sp. CNPT3 | Bacteria | Ni | user | Ni-Fe hydrogenase 4 component G | ZP_01215760.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrobaculum arsenaticum DSM 13514 | Archaea | Ni | user | Ni-Fe hydrogenase, large subunit | YP_001153513.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrobaculum calidifontis JCM 11548 | Archaea | Ni | user | Ni-Fe hydrogenase, large subunit | YP_001056462.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrobaculum islandicum DSM 4184 | Archaea | Ni | user | Ni-Fe hydrogenase, large subunit | YP_929722.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus abyssi GE5 | Archaea | Ni | user | Ni-Fe hydrogenase 4 component g | NP_127148.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus abyssi GE5 | Archaea | Ni | user | Ni-Fe hydrogenase alpha chain | NP_126548.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus abyssi GE5 | Archaea | Ni | user | Ni-Fe hydrogenase alpha chain | NP_126632.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus abyssi GE5 | Archaea | Ni | user | Ni-Fe hydrogenase related, subunit H | NP_126404.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus furiosus DSM 3638 | Archaea | Ni | user | Ni-Fe hydrogenase II alpha (hydrogenase subunit alpha) | NP_579061.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus furiosus DSM 3638 | Archaea | Ni | user | Ni-Fe hydrogenase alpha subunit | NP_578623.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus furiosus DSM 3638 | Archaea | Ni | user | Ni-Fe hydrogenase alpha | NP_579163.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus horikoshii OT3 | Archaea | Ni | user | Ni-Fe hydrogenase III large subunit | NP_143306.1 | | PDB BLAST (NCBI) | STRING search |
| Pyrococcus horikoshii OT3 | Archaea | Ni | user | Ni-Fe hydrogenase alpha chain | NP_143179.1 | | PDB BLAST (NCBI) | STRING search |
| Ralstonia eutropha H16 | Bacteria | Ni | user | urease subunit alpha | YP_725593.1 | | PDB BLAST (NCBI) | STRING search |
| Ralstonia metallidurans CH34 | Bacteria | Ni | user | Ni-Fe hydrogenase, large subunit | YP_583451.1 | | PDB BLAST (NCBI) | STRING search |
| Ralstonia metallidurans CH34 | Bacteria | Ni | user | urease subunit alpha | YP_583116.1 | | PDB BLAST (NCBI) | STRING search |
| Ralstonia pickettii 12J | Bacteria | Ni | user | urease, alpha subunit | YP_001899750.1 | | PDB BLAST (NCBI) | STRING search |
| Ralstonia solanacearum GMI1000 | Bacteria | Ni | user | urease subunit alpha | NP_520153.1 | | PDB BLAST (NCBI) | STRING search |
| Reinekea sp. MED297 | Bacteria | Ni | user | urease, alpha subunit | ZP_01113597.1 | | PDB BLAST (NCBI) | STRING search |
| Rhizobium etli CFN 42 | Bacteria | Ni | user | urease subunit alpha | YP_470796.1 | | PDB BLAST (NCBI) | STRING search |
| Rhizobium leguminosarum bv. viciae 3841 | Bacteria | Ni | user | urease subunit alpha | YP_769310.1 | | PDB BLAST (NCBI) | STRING search |
| Rhodobacter sphaeroides 2.4.1 | Bacteria | Ni | user | Ni-Fe hydrogenase large subunit | YP_353565.1 | | PDB BLAST (NCBI) | STRING search |
