1OLR

The Humicola grisea Cel12A Enzyme Structure at 1.2 A Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.151 
  • R-Value Work: 0.135 

wwPDB Validation 3D Report Full Report


This is version 1.3 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: 10.1110/ps.03220403
  • Primary Citation of Related Structures:  1OLQ

  • 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 g ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDO-BETA-1,4-GLUCANASE
A
224Humicola griseaGene Names: cel12A
Find proteins for Q8NJY3 (Humicola grisea)
Go to UniProtKB:  Q8NJY3
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.151 
  • R-Value Work: 0.135 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 49.231α = 90.00
b = 49.231β = 90.00
c = 165.517γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-17
    Type: Advisory, Data collection