| Strain | Pseudomonas aeruginosa UCBPP-PA14 |
| GI | 116049155 |
| Locus Tag | PA14_48700 |
| Description | glutathione-regulated potassium-efflux system protein KefB |
| Strain | Pseudomonas putida BIRD-1 |
| GI | 386014515 |
| Locus Tag | PPUBIRD1_5040 |
| Description | Potassium efflux system protein |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83643660 |
| Locus Tag | HCH_00774 |
| Description | Kef-type K+ transport system membrane protein |