4 component system: The ATP-binding Cassette (ABC) Superfamily
| P07654 | PstA aka PhoT aka B3726 |
|---|---|
| P0AAH0 | Phosphate import ATP-binding protein PstB aka PhoT aka B3725 |
| P0AG82 | Phosphate-binding protein PstS aka PhoS aka B3728 |
| P0AGH8 | Phosphate transport system permease protein PstC aka PhoW aka B3727 |