3ATK
Crystal structure of trypsin complexed with cycloheptanamine
Entity
| Entity ID | Chain ID | Description | Type | Chain length | Formula weight | Number of molecules | DB Name (Accession) | Biological source | Descriptive keywords | 
| 1 | A (A)  | Cationic trypsin | polymer | 223 | 23324.3 | 1 | UniProt (P00760) Pfam (PF00089)  | Bos taurus (bovine) | Beta-trypsin | 
| 2 | B (A)  | CALCIUM ION | non-polymer | 40.1 | 1 | Chemie (CA) | |||
| 3 | C, D (A)  | DIMETHYL SULFOXIDE | non-polymer | 78.1 | 2 | Chemie (DMS) | |||
| 4 | E (A)  | cycloheptanamine | non-polymer | 113.2 | 1 | Chemie (SZ1) | |||
| 5 | F (A)  | water | water | 18.0 | 301 | Chemie (HOH) | 
Sequence viewer
Contents of the asymmetric unit
| Polymers | Number of chains | 1 | 
| Total formula weight | 23324.3 | |
| Non-Polymers* | Number of molecules | 4 | 
| Total formula weight | 309.5 | |
| All* | Total formula weight | 23633.8 | 






