| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596548 |
| Locus Tag | PA1351 |
| Description | probable sigma-70 factor, ECF subfamily |
| Strain | Pseudomonas putida W619 |
| GI | 170723010 |
| Locus Tag | PputW619_3848 |
| Description | RNA polymerase ECF-subfamily sigma factor |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83648243 |
| Locus Tag | HCH_05594 |
| Description | TPR repeat-containing RNA polymerase sigma factor |