1EPO

ENDOTHIA ASPARTIC PROTEINASE (ENDOTHIAPEPSIN) COMPLEXED WITH CP-81,282 (MOR PHE NLE CHF NME)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Direct observation by X-ray analysis of the tetrahedral intermediate of aspartic proteinases.

Veerapandian, B.Cooper, J.B.Sali, A.Blundell, T.L.Rosati, R.L.Dominy, B.W.Damon, D.B.Hoover, D.J.

(1992) Protein Sci. 1: 322-328

  • DOI: 10.1002/pro.5560010303

  • PubMed Abstract: 
  • We report the X-ray analysis at 2.0 A resolution for crystals of the aspartic proteinase endothiapepsin (EC 3.4.23.6) complexed with a potent difluorostatone-containing tripeptide renin inhibitor (CP-81,282). The scissile bond surrogate, an electroph ...

    We report the X-ray analysis at 2.0 A resolution for crystals of the aspartic proteinase endothiapepsin (EC 3.4.23.6) complexed with a potent difluorostatone-containing tripeptide renin inhibitor (CP-81,282). The scissile bond surrogate, an electrophilic ketone, is hydrated in the complex. The pro-(R) (statine-like) hydroxyl of the tetrahedral carbonyl hydrate is hydrogen-bonded to both active-site aspartates 32 and 215 in the position occupied by a water in the native enzyme. The second hydroxyl oxygen of the hydrate is hydrogen-bonded only to the outer oxygen of Asp 32. These experimental data provide a basis for a model of the tetrahedral intermediate in aspartic proteinase-mediated cleavage of the amide bond. This indicates a mechanism in which Asp 32 is the proton donor and Asp 215 carboxylate polarizes a bound water for nucleophilic attack. The mechanism involves a carboxylate (Asp 32) that is stabilized by extensive hydrogen bonding, rather than an oxyanion derivative of the peptide as in serine proteinase catalysis.


    Related Citations: 
    • A Structural Comparison of 21 Inhibitor Complexes of the Aspartic Proteinase from Endothia Parasitica
      Bailey, D.,Cooper, J.B.
      () TO BE PUBLISHED --: --
    • The 3D Structure at 2 Angstroms Resolution of Endothiapepsin
      Blundell, T.L.,Jenkins, J.,Sewell, B.T.,Pearl, L.H.,Cooper, J.B.,Tickle, I.J.,Veerapandian, B.,Wood, S.P.
      (1990) J.Mol.Biol. 211: 919


    Organizational Affiliation

    Department of Crystallography, Birkbeck College, London, UK.




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
2Z3
Query on 2Z3

Download SDF File 
Download CCD File 
E
N-(morpholin-4-ylcarbonyl)-L-phenylalanyl-N-[(1R)-1-(cyclohexylmethyl)-3,3-difluoro-2,2-dihydroxy-4-(methylamino)-4-oxobutyl]-L-norleucinamide
CP-81,282
C32 H49 F2 N5 O7
IPZOKQNUWWOCTK-GSDHBNRESA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000416 (2Z3)
Query on PRD_000416
ECP-81,282, MOR-PHE-NLE-CHF-NMEPeptide-like / Inhibitor

--

External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2Z3Ki: 11 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 53.700α = 90.00
b = 73.900β = 110.00
c = 45.800γ = 90.00
Software Package:
Software NamePurpose
RESTRAINrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-12-20
    Type: Initial release
  • Version 1.1: 2008-03-10
    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