4 component system: The ATP-binding Cassette (ABC) Superfamily
| P0AFK4 | Spermidine/putrescine transport system permease protein PotB aka B1125 |
|---|---|
| P0AFK6 | Spermidine/putrescine transport system permease protein PotC aka B1124 |
| P0AFK9 | Spermidine/putrescine-binding periplasmic protein PotD aka B1123 |
| P69874 | Spermidine/putrescine import ATP-binding protein PotA aka B1126 |