1MCV

Crystal Structure Analysis of a Hybrid Squash Inhibitor in Complex with Porcine Pancreatic Elastase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a hybrid squash inhibitor in complex with porcine pancreatic elastase at 1.8 A resolution.

Ay, J.Hilpert, K.Krauss, N.Schneider-Mergener, J.Hohne, W.

(2003) Acta Crystallogr.,Sect.D 59: 247-254


  • PubMed Abstract: 
  • The crystal structure of porcine pancreatic elastase in complex with a hybrid squash inhibitor (HEI-TOE I; 28 amino acids) has been determined to a resolution of 1.8 A. To construct the hybrid inhibitor, the trypsin-binding loop of the squash inhibit ...

    The crystal structure of porcine pancreatic elastase in complex with a hybrid squash inhibitor (HEI-TOE I; 28 amino acids) has been determined to a resolution of 1.8 A. To construct the hybrid inhibitor, the trypsin-binding loop of the squash inhibitor from Ecballium elaterium was substituted by the sequence of a peptide that was derived from the third domain of the turkey ovomucoid inhibitor and was optimized to inhibit porcine pancreatic elastase. This modification of the squash inhibitor changed its specificity for trypsin to a specificity for porcine pancreatic elastase. Specific interactions of this hybrid inhibitor with porcine pancreatic elastase and the differences from the interactions of the ovomucoid inhibitor with human leukocyte elastase are discussed. The binding loop of the inhibitor adopts a 'canonical' conformation and the scissile bond Leu-Glu remains intact.


    Related Citations: 
    • X-ray crystal structure of the complex of human leukocyte elastase (PMN elastase) and the third DOMAIN OF the turkey ovomucoid inhibitor
      Bode, W.,Wei, A.Z.,Huber, R.,Meyer, E.,Travis, J.,Neumann, S.
      (1986) Embo J. 5: 2453
    • Atomic Resolution Structure of native porcine pancreatic elastase at 1.1 A
      Wurtele, M.,Hahn, M.,Hilpert, K.,Hohne, W.
      (2000) Acta Crystallogr.,Sect.D 56: 520
    • THE REFINED 2.0 ANGSTROMS X-RAY CRYSTAL STRUCTURE OF THE COMPLEX FORMED BETWEEN BOVINE BETA-TRYPSIN AND CMTI-I, A TRYPSIN INHIBITOR FROM SQUASH SEEDS (CUCURBITA MAXIMA). TOPOLOGICAL SIMILARITY OF THE SQUASH SEED INHIBITORS WITH THE CARBOXYPEPTIDASE A INHIBITOR FROM POTATOES
      Bode, W.,Greyling, H.J.,Huber, R.,Otlewski, J.,Wilusz, T.
      (1989) FEBS Lett. 242: 285


    Organizational Affiliation

    Institut für Biochemie, Universitätsklinikum Charité, Humboldt-Universität zu Berlin, Abteilung Proteinstrukturforschung, Monbijoustrasse 2, 10117 Berlin, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Elastase 1
A
240Sus scrofaMutation(s): 0 
Gene Names: CELA1 (ELA1)
EC: 3.4.21.36
Find proteins for P00772 (Sus scrofa)
Go to Gene View: CELA1
Go to UniProtKB:  P00772
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HEI-TOE I
I
28N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.330α = 90.00
b = 56.440β = 90.00
c = 72.760γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance