| Role | Gene | Name | |
|---|
| Assimilatory nitrate reductase large subunit (EC:1.7.99.4) | Psyr_2099 | | |
| Cytochrome c nitrite reductase, small subunit NrfH | No genes | | |
| Cytochrome c-type heme lyase subunit nrfE, nitrite reductase complex assembly | No genes | | |
| Cytochrome c-type heme lyase subunit nrfF, nitrite reductase complex assembly | No genes | | |
| Cytochrome c-type heme lyase subunit nrfG, nitrite reductase complex assembly | No genes | | |
| Cytochrome c-type protein NapC | No genes | | |
| Cytochrome c-type protein NrfB precursor | No genes | | |
| Cytochrome c552 precursor (EC 1.7.2.2) | No genes | | |
| Ferredoxin--nitrite reductase (EC 1.7.7.1) | No genes | | |
| Ferredoxin-type protein NapF (periplasmic nitrate reductase) | No genes | | |
| Ferredoxin-type protein NapG (periplasmic nitrate reductase) | No genes | | |
| Nitrate ABC transporter, ATP-binding protein | No genes | | |
| Nitrate ABC transporter, nitrate-binding protein | Psyr_2105 | | |
| Nitrate ABC transporter, permease protein | No genes | | |
| Nitrate reductase cytochrome c550-type subunit | No genes | | |
| Nitrate/nitrite response regulator protein | No genes | | |
| Nitrate/nitrite sensor protein (EC 2.7.3.-) | No genes | | |
| Nitrate/nitrite transporter | Psyr_1709 | | |
| | Psyr_2102 | | |
| Nitrite reductase [NAD(P)H] large subunit (EC 1.7.1.4) | Psyr_2100 | | |
| | Psyr_3099 | | |
| Nitrite reductase [NAD(P)H] small subunit (EC 1.7.1.4) | Psyr_3100 | | |
| Nitrite reductase probable [NAD(P)H] subunit (EC 1.7.1.4) | No genes | | |
| Nitrite reductase probable electron transfer 4Fe-S subunit (EC 1.7.1.4) | No genes | | |
| Nitrite transporter NirC | No genes | | |
| Nitrite transporter from formate/nitrite family | No genes | | |
| NrfC protein | No genes | | |
| NrfD protein | No genes | | |
| Periplasmic nitrate reductase component NapD | No genes | | |
| Periplasmic nitrate reductase component NapE | No genes | | |
| Periplasmic nitrate reductase component NapL | No genes | | |
| Periplasmic nitrate reductase precursor (EC 1.7.99.4) | No genes | | |
| Polyferredoxin NapH (periplasmic nitrate reductase) | No genes | | |
| Putative thiol:disulfide oxidoreductase, nitrite reductase complex assembly | No genes | | |
| Respiratory nitrate reductase alpha chain (EC 1.7.99.4) | No genes | | |
| Respiratory nitrate reductase beta chain (EC 1.7.99.4) | No genes | | |
| Respiratory nitrate reductase delta chain (EC 1.7.99.4) | No genes | | |
| Respiratory nitrate reductase gamma chain (EC 1.7.99.4) | No genes | | |
| Respiratory nitrate reductase subunit, conjectural (EC 1.7.99.4) | No genes | | |
| Response regulator NasT | Psyr_2104 | | |