4ER2
The active site of aspartic proteinases
Summary for 4ER2
| Entry DOI | 10.2210/pdb4er2/pdb |
| Related PRD ID | PRD_000557 |
| Descriptor | ENDOTHIAPEPSIN, PEPSTATIN, SULFATE ION, ... (4 entities in total) |
| Functional Keywords | acid proteinase, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor |
| Biological source | Cryphonectria parasitica (chestnut blight fungus) More |
| Total number of polymer chains | 2 |
| Total formula weight | 34787.94 |
| Authors | Bailey, D.,Veerapandian, B.,Cooper, J.B.,Blundell, T.L. (deposition date: 1990-10-20, release date: 1991-01-15, Last modification date: 2024-10-30) |
| Primary citation | Pearl, L.,Blundell, T. The active site of aspartic proteinases FEBS Lett., 174:96-101, 1984 Cited by PubMed Abstract: The active site of the aspartic proteinase, endothiapepsin, has been defined by X-ray analysis and restrained least-squares refinement at 2.1 A resolution with a crystallographic agreement value of 0.16. The environments of the two catalytically important aspartyl groups are remarkably similar and the contributions of the NH2- and COOH-terminal domains to the catalytic centre are related by a local 2-fold axis. The carboxylates of the aspartyls share a hydrogen bond and have equivalent contacts to a bound water molecule or hydroxonium ion lying on the local diad. The main chains around 32 and 215 are connected by a novel interaction involving diad-related threonines. It is suggested that the two pKa values of the active site aspartyls arise from a structure not unlike that in maleic acid with a hydrogen-bonded intermediate species and a dicarboxylate characterised by electrostatic repulsions between the two negatively charged groups. PubMed: 6381096DOI: 10.1016/0014-5793(84)81085-6 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2 Å) |
Structure validation
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