| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596607 |
| Locus Tag | PA1410 |
| Description | probable periplasmic spermidine/putrescine-binding protein |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472324791 |
| Locus Tag | H681_08105 |
| Description | periplasmic spermidine/putrescine-binding protein |
| Strain | Pseudomonas protegens Pf-5 |
| GI | 70730024 |
| Locus Tag | PFL_2656 |
| Description | putrescine ABC transporter periplasmic putrescine-binding protein |