3ER3

The active site of aspartic proteinases


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.188 

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

  • Primary Citation of Related Structures:  

  • 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 impo ...

    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.


    Related Citations: 
    • Four-Fold Structural Repeat in the Acid Proteases
      Blundell, T.L.,Sewell, B.T.,Mclachlan, A.D.
      (1979) Biochim.Biophys.Acta 580: 24
    • Homology Among Acid Proteases. Comparison of Crystal Structures at 3 Angstroms Resolution of Acid Proteases from Rhizopus Chinensis and Endothia Parasitica
      Subramanian, E.,Swan, I.D.A.,Liu, M.,Davies, D.R.,Jenkins, J.A.,Tickle, I.J.,Blundell, T.L.
      (1977) Proc.Natl.Acad.Sci.USA 74: 556
    • X-Ray Analysis and Circular Dichroism of the Acid Protease from Endothia Parasitica and Chymosin
      Jenkins, J.,Tickle, I.,Sewell, T.,Ungaretti, L.,Wollmer, A.,Blundell, T.
      (1977) Adv.Exp.Med.Biol. 95: 43
    • The Three-Dimensional Structure of Acid Proteinases
      Blundell, T.L.,Jenkins, J.A.,Khan, G.,Roychowdhury, P.,Sewell, T.,Tickle, I.J.,Wood, E.A.
      (1979) Proc.FEBS Meet. 52: 81
    • Structural Evidence for Gene Duplication in the Evolution of Acid Proteases
      Tang, J.,James, M.N.G.,Hsu, I.N.,Jenkins, J.A.,Blundell, T.L.
      (1978) Nature 271: 618
    • Active Site of Acid Proteinases
      Blundell, T.L.,Jones, H.B.,Khan, G.,Taylor, G.,Sewell, T.S.,Pearl, L.H.,Wood, S.P.
      (1979) Proc.FEBS Meet. 60: 281



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDOTHIAPEPSIN
E
330Cryphonectria parasiticaMutation(s): 0 
Gene Names: EAPA (EPN-1)
EC: 3.4.23.22
Find proteins for P11838 (Cryphonectria parasitica)
Go to UniProtKB:  P11838
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
0EL
Query on 0EL

Download SDF File 
Download CCD File 
E
6-ammonio-N-[(2R,4R,5R)-5-{[N-(tert-butoxycarbonyl)-L-phenylalanyl-3-(1H-imidazol-3-ium-4-yl)-L-alanyl]amino}-6-cyclohexyl-4-hydroxy-2-(2-methylpropyl)hexanoyl]-L-norleucylphenylalanine
C51 H78 N8 O9
YHLJEWZZOJLRNJ-OBSKRNKISA-P
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
0ELKi: 81 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 43.000α = 90.00
b = 75.700β = 96.90
c = 42.900γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1991-04-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2012-12-12
    Type: Other
  • Version 1.4: 2017-11-29
    Type: Derived calculations, Other