| Strain | Pseudomonas syringae pv. syringae B728a |
| GI | 66043596 |
| Locus Tag | Psyr_0327 |
| Description | sigma-54 factor, interaction region |
| Strain | Pseudomonas putida BIRD-1 |
| GI | 386014437 |
| Locus Tag | PPUBIRD1_4959 |
| Description | Sigma-54 dependent transcriptional regulator |
| Strain | Azotobacter vinelandii CA6 |
| GI | 482901199 |
| Locus Tag | AvCA6_31690 |
| Description | Sigma54 -dependent activator protein |