1ER8

THE ACTIVE SITE OF ASPARTIC PROTEINASES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The Active Site of Aspartic Proteinases

Pearl, L.Blundell, T.

(1984) FEBS Lett 174: 96-101

  • DOI: https://doi.org/10.1016/0014-5793(84)81085-6
  • Primary Citation of Related Structures:  
    1ER8, 3ER3, 4APE, 4ER1, 4ER2

  • 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.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EndothiapepsinA [auth E]330Cryphonectria parasiticaMutation(s): 0 
Gene Names: EAPAEPN-1
EC: 3.4.23.22
UniProt
Find proteins for P11838 (Cryphonectria parasitica)
Explore P11838 
Go to UniProtKB:  P11838
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11838
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
H-77B [auth I]8Equus caballusMutation(s): 0 
Gene Names: AGT
UniProt
Find proteins for P01016 (Equus caballus)
Explore P01016 
Go to UniProtKB:  P01016
Entity Groups  
UniProt GroupP01016
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.2α = 90
b = 75.7β = 97.1
c = 42.9γ = 90

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1991-10-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2024-11-20
    Changes: Data collection, Database references, Derived calculations, Structure summary