3E8L
The Crystal Structure of the Double-headed Arrowhead Protease Inhibitor A in Complex with Two Trypsins
Entity
| Entity ID | Chain ID | Description | Type | Chain length | Formula weight | Number of molecules | DB Name (Accession) | Biological source | Descriptive keywords |
| 1 | A (C) | Serine proteinase inhibitor A | polymer | 185 | 20230.7 | 1 | UniProt (Q7M1P4) Pfam (PF00197) | Sagittaria sagittifolia (Arrowhead) | |
| 2 | B, C (A, B) | Cationic trypsin | polymer | 223 | 23324.3 | 2 | UniProt (P00760) Pfam (PF00089) | Bos taurus (Bovine) | Beta-trypsin |
| 3 | D, E, F, R, S... (C, A, B) | GLYCEROL | non-polymer | 92.1 | 7 | Chemie (GOL) | |||
| 4 | EA, G, H, V (B, C, A) | ACETATE ION | non-polymer | 59.0 | 4 | Chemie (ACT) | |||
| 5 | I, U (C, A) | SULFATE ION | non-polymer | 96.1 | 2 | Chemie (SO4) | |||
| 6 | J, K, N (A) | SODIUM ION | non-polymer | 23.0 | 3 | Chemie (NA) | |||
| 7 | L, M, O, P, Q... (A, B) | CALCIUM ION | non-polymer | 40.1 | 7 | Chemie (CA) | |||
| 8 | AA, BA, CA, Z (B) | 1,2-ETHANEDIOL | non-polymer | 62.1 | 4 | Chemie (EDO) | |||
| 9 | DA (B) | DI(HYDROXYETHYL)ETHER | non-polymer | 106.1 | 1 | Chemie (PEG) | |||
| 10 | FA, GA, HA (C, A, B) | water | water | 18.0 | 160 | Chemie (HOH) |
Sequence modifications
C: 2 - 177 (UniProt: Q7M1P4)
| PDB | External Database | Details |
|---|---|---|
| Met -7 | - | expression tag |
| Gly -6 | - | expression tag |
| His -5 | - | expression tag |
| His -4 | - | expression tag |
| His -3 | - | expression tag |
| His -2 | - | expression tag |
| His -1 | - | expression tag |
| His 0 | - | expression tag |
| Met 1 | - | expression tag |
| Arg 39 | His 63 | engineered mutation |
| Gln 172 | Arg 196 | engineered mutation |
Sequence viewer
Contents of the asymmetric unit
| Polymers | Number of chains | 3 |
| Total formula weight | 66879.2 | |
| Non-Polymers* | Number of molecules | 28 |
| Total formula weight | 1776.9 | |
| All* | Total formula weight | 68656.1 |
