1W7Z

Crystal structure of the free (uncomplexed) Ecballium elaterium trypsin inhibitor (EETI-II)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 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.Scheldrick, G.M.Uson, I.

(2005) Acta Crystallogr.,Sect.D 61: 1255

  • DOI: 10.1107/S0907444905021207
  • Primary Citation of Related Structures:  

  • 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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN INHIBITOR II
A, B, C, D, E, F, G, H
31Ecballium elateriumMutation(s): 0 
Find proteins for P12071 (Ecballium elaterium)
Go to UniProtKB:  P12071
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, C, E
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
FMT
Query on FMT

Download SDF File 
Download CCD File 
B, D, F
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.194 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 71.160α = 90.00
b = 82.340β = 118.80
c = 62.930γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
DENZOdata reduction
SADABSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance