| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596548 |
| Locus Tag | PA1351 |
| Description | probable sigma-70 factor, ECF subfamily |
| Strain | Pseudomonas putida S16 |
| GI | 339488792 |
| Locus Tag | PPS_3899 |
| 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 |