| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596973 |
| Locus Tag | PA1776 |
| Description | ECF sigma factor SigX |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472325299 |
| Locus Tag | H681_10665 |
| Description | RNA polymerase sigma factor SigX |
| Strain | Pseudomonas protegens Pf-5 |
| GI | 70734370 |
| Locus Tag | PFL_1875 |
| Description | RNA polymerase sigma factor SigX |