| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15599466 |
| Locus Tag | PA4270 |
| Description | DNA-directed RNA polymerase beta chain |
| Strain | Pseudomonas stutzeri ATCC 17588 = LMG 11199 |
| GI | 339492740 |
| Locus Tag | PSTAB_0663 |
| Description | DNA-directed RNA polymerase subunit beta |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83648859 |
| Locus Tag | HCH_06224 |
| Description | DNA-directed RNA polymerase subunit beta |