1H9I

COMPLEX OF EETI-II MUTANT WITH PORCINE TRYPSIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.175 
  • R-Value Observed: 0.142 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structure of Ecballium Elaterium Trypsin Inhibitor II (Eeti-II): A Rigid Molecular Scaffold

Kraetzner, R.Debreczeni, J.E.Pape, T.Schneider, T.R.Wentzel, A.Kolmar, H.Sheldrick, G.M.Uson, I.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1255

  • DOI: 10.1107/S0907444905021207
  • Primary Citation of Related Structures:  
    1W7Z, 1H9I, 1H9H

  • PubMed Abstract: 
  • The Ecballium elaterium trypsin inhibitor II (EETI-II) belongs to the family of squash inhibitors and is one of the strongest inhibitors known for trypsin. The eight independent molecules of EETI-II in the crystal structure reported here provide a go ...

    The Ecballium elaterium trypsin inhibitor II (EETI-II) belongs to the family of squash inhibitors and is one of the strongest inhibitors known for trypsin. The eight independent molecules of EETI-II in the crystal structure reported here provide a good opportunity to test the hypothesis that this small cystine-knot protein (knottin) is sufficiently rigid to be used as a molecular scaffold for protein-engineering purposes. To extend this test, the structures of two complexes of EETI-II with trypsin have also been determined, one carrying a four-amino-acid mutation of EETI-II. The remarkable similarity of these structures confirms the rigidity of the molecular framework and hence its suitability as a molecular scaffold.


    Related Citations: 
    • Sequence Requirements of the Gpng Beta-Turn of the Ecballium Elaterium Trypsin Inhibitor II Explored by Combinatorial Library Screening
      Wentzel, A., Christmann, A., Kraetzner, R., Kolmar, H.
      (1999) J Biol Chem 274: 21037
    • Min-21 and Min-23, the Smallest Peptides that Fold Like a Cystine-Stabilized Beta-Sheet Motif: Design, Solution Structure, and Thermal Stability
      Heitz, A., Le-Nguyen, D., Chiche, L.
      (1999) Biochemistry 38: 10615
    • Use of Restrained Molecular Dynamics in Water to Determine Three-Dimensional Protein Structure: Prediction of the Three-Dimensional Structure of Ecballium Elaterium Trypsin Inhibitor II
      Chiche, L., Gaboriaud, C., Heitz, A., Mornon, J.P., Castro, B., Kollman, P.A.
      (1989) Proteins 6: 405

    Organizational Affiliation

    Lehrstuhl für Strukturchemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D37077 Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSINE223Sus scrofaMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00761 (Sus scrofa)
Explore P00761 
Go to UniProtKB:  P00761
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSIN INHIBITOR III36Ecballium elateriumMutation(s): 4 
Find proteins for P12071 (Ecballium elaterium)
Explore P12071 
Go to UniProtKB:  P12071
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.175 
  • R-Value Observed: 0.142 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.862α = 90
b = 139.862β = 90
c = 33.667γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
DENZOdata reduction
SCALEPACKdata scaling
EPMRphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-07-26
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-04
    Changes: Data collection
  • Version 1.4: 2019-05-22
    Changes: Data collection, Refinement description