| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596973 |
| Locus Tag | PA1776 |
| Description | ECF sigma factor SigX |
| Strain | Pseudomonas resinovorans NBRC 106553 |
| GI | 512619364 |
| Locus Tag | PCA10_37110 |
| Description | RNA polymerase ECF-type sigma factor SigX |
| Strain | Pseudomonas syringae pv. tomato str. DC3000 |
| GI | 28869498 |
| Locus Tag | PSPTO_2298 |
| Description | RNA polymerase sigma factor SigX |