1EG1

ENDOGLUCANASE I FROM TRICHODERMA REESEI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of the catalytic core domain of endoglucanase I from Trichoderma reesei at 3.6 A resolution, and a comparison with related enzymes.

Kleywegt, G.J.Zou, J.Y.Divne, C.Davies, G.J.Sinning, I.Stahlberg, J.Reinikainen, T.Srisodsuk, M.Teeri, T.T.Jones, T.A.

(1997) J.Mol.Biol. 272: 383-397

  • DOI: 10.1006/jmbi.1997.1243

  • PubMed Abstract: 
  • Cellulose is the most abundant polymer in the biosphere. Although generally resistant to degradation, it may be hydrolysed by cellulolytic organisms that have evolved a variety of structurally distinct enzymes, cellobiohydrolases and endoglucanases, ...

    Cellulose is the most abundant polymer in the biosphere. Although generally resistant to degradation, it may be hydrolysed by cellulolytic organisms that have evolved a variety of structurally distinct enzymes, cellobiohydrolases and endoglucanases, for this purpose. Endoglucanase I (EG I) is the major endoglucanase produced by the cellulolytic fungus Trichoderma reesei, accounting for 5 to 10% of the total amount of cellulases produced by this organism. Together with EG I from Humicola insolens and T. reesei cellobiohydrolase I (CBH I), the enzyme is classified into family 7 of the glycosyl hydrolases, and it catalyses hydrolysis with a net retention of the anomeric configuration. The structure of the catalytic core domain (residues 1 to 371) of EG I from T. reesei has been determined at 3.6 A resolution by the molecular replacement method using the structures of T. reesei CBH I and H. insolens EG I as search models. By employing the 2-fold non-crystallographic symmetry (NCS), the structure was refined successfully, despite the limited resolution. The final model has an R-factor of 0.201 (Rfree 0.258). The structure of EG I reveals an extended, open substrate-binding cleft, rather than a tunnel as found in the homologous cellobiohydrolase CBH I. This confirms the earlier proposal that the tunnel-forming loops in CBH I have been deleted in EG I, which has resulted in an open active site in EG I, enabling it to function as an endoglucanase. Comparison of the structure of EG I with several related enzymes reveals structural similarities, and differences that relate to their biological function in degrading particular substrates. A possible structural explanation of the drastically different pH profiles of T. reesei and H. insolens EG I is proposed.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Studies on the Core Proteins of Cellobiohydrolase I and Endoglucanase I from Trichoderma Reesei
      Divne, C.,Sinning, I.,Stahlberg, J.,Pettersson, G.,Bailey, M.,Siika-Aho, M.,Margolles-Clark, E.,Teeri, T.,Jones, T.A.
      (1993) J.Mol.Biol. 234: 905


    Organizational Affiliation

    Biomedical Centre, Uppsala University, Uppsala, SE-751 24, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDOGLUCANASE I
A, C
371Hypocrea jecorinaGene Names: egl1
EC: 3.2.1.4
Find proteins for P07981 (Hypocrea jecorina)
Go to UniProtKB:  P07981
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A, C
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.201 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 101.400α = 90.00
b = 101.400β = 90.00
c = 199.500γ = 90.00
Software Package:
Software NamePurpose
CCP4data reduction
AMoREphasing
X-PLORrefinement
DENZOdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-08-20
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance