| Strain | Pseudomonas syringae pv. syringae B728a |
| GI | 66045698 |
| Locus Tag | Psyr_2462 |
| Description | nitrite/sulfite reductase, hemoprotein beta-component, ferrodoxin-like:nitrite and sulfite reductase 4Fe-4S region |
| Strain | Pseudomonas putida S16 |
| GI | 339486876 |
| Locus Tag | PPS_1957 |
| Description | sulfite reductase (ferredoxin) |
| Strain | Azotobacter vinelandii CA6 |
| GI | 482897796 |
| Locus Tag | AvCA6_27520 |
| Description | Sulfite reductase, beta subunit (hemoprotein) |