Entity
| Entity ID | Chain ID | Description | Type | Chain length | Formula weight | Number of molecules | DB Name (Accession) | Biological source | Descriptive keywords |
| 1 | A (R) | Trp operon repressor | polymer | 107 | 12238.9 | 1 | UniProt (P0A881) Pfam (PF01371) | Escherichia coli | |
| 2 | B (R) | SODIUM ION | non-polymer | 23.0 | 1 | Chemie (NA) | |||
| 3 | C (R) | SULFATE ION | non-polymer | 96.1 | 1 | Chemie (SO4) | |||
| 4 | D (R) | TRYPTOPHAN | non-polymer | 204.2 | 1 | Chemie (TRP) | |||
| 5 | E (R) | water | water | 18.0 | 85 | Chemie (HOH) |
Sequence viewer
Contents of the asymmetric unit
| Polymers | Number of chains | 1 |
| Total formula weight | 12238.9 | |
| Non-Polymers* | Number of molecules | 3 |
| Total formula weight | 323.3 | |
| All* | Total formula weight | 12562.2 |
