1OLR

The Humicola grisea Cel12A Enzyme Structure at 1.2 A Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.151 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.135 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

The Humicola Grisea Cel12A Enzyme Structure at 1.2 A Resolution and the Impact of its Free Cysteine Residues on Thermal Stability

Sandgren, M.Gualfetti, P.J.Paech, C.Paech, S.Shaw, A.Gross, L.S.Saldajeno, M.Berglund, G.I.Jones, T.A.Mitchinson, C.

(2003) Protein Sci 12: 2782

  • DOI: https://doi.org/10.1110/ps.03220403
  • Primary Citation of Related Structures:  
    1OLQ, 1OLR

  • PubMed Abstract: 

    As part of a program to discover improved glycoside hydrolase family 12 (GH 12) endoglucanases, we have extended our previous work on the structural and biochemical diversity of GH 12 homologs to include the most stable fungal GH 12 found, Humicola grisea Cel12A. The H. grisea enzyme was much more stable to irreversible thermal denaturation than the Trichoderma reesei enzyme. It had an apparent denaturation midpoint (T(m)) of 68.7 degrees C, 14.3 degrees C higher than the T. reesei enzyme. There are an additional three cysteines found in the H. grisea Cel12A enzyme. To determine their importance for thermal stability, we constructed three H. grisea Cel12A single mutants in which these cysteines were exchanged with the corresponding residues in the T. reesei enzyme. We also introduced these cysteine residues into the T. reesei enzyme. The thermal stability of these variants was determined. Substitutions at any of the three positions affected stability, with the largest effect seen in H. grisea C206P, which has a T(m) 9.1 degrees C lower than that of the wild type. The T. reesei cysteine variant that gave the largest increase in stability, with a T(m) 3.9 degrees C higher than wild type, was the P201C mutation, the converse of the destabilizing C206P mutation in H. grisea. To help rationalize the results, we have determined the crystal structure of the H. grisea enzyme and of the most stable T. reesei cysteine variant, P201C. The three cysteines in H. grisea Cel12A play an important role in the thermal stability of this protein, although they are not involved in a disulfide bond.


  • Organizational Affiliation

    Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, S-751 24 Uppsala, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ENDO-BETA-1,4-GLUCANASE224Trichocladium griseumMutation(s): 0 
EC: 3.2.1.4
UniProt
Find proteins for Q8NJY3 (Trichocladium griseum)
Explore Q8NJY3 
Go to UniProtKB:  Q8NJY3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NJY3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PCA
Query on PCA
A
L-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.151 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.135 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.231α = 90
b = 49.231β = 90
c = 165.517γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-17
    Changes: Advisory, Data collection
  • Version 2.0: 2020-03-11
    Changes: Derived calculations, Other, Polymer sequence
  • Version 2.1: 2023-12-13
    Changes: Advisory, Data collection, Database references, Refinement description
  • Version 2.2: 2024-11-06
    Changes: Structure summary