| Strain | Pseudomonas stutzeri RCH2 |
| GI | 431925983 |
| Locus Tag | Psest_0794 |
| Description | parallel beta-helix repeat (two copies) |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472328119 |
| Locus Tag | H681_24790 |
| Description | nitrous oxide reductase maturation protein NosD |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83646127 |
| Locus Tag | HCH_03387 |
| Description | nitrous oxidase accessory protein |