1OLQ

The Trichoderma reesei cel12a P201C mutant, structure at 1.7 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

wwPDB Validation 3D Report Full Report


This is version 2.1 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
  • Structures With Same Primary Citation

  • 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-GLUCANASEA, B218Trichoderma reeseiMutation(s): 1 
Gene Names: egl
EC: 3.2.1.4
Find proteins for O00095 (Hypocrea jecorina)
Explore O00095 
Go to UniProtKB:  O00095
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
A, B
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A,BL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.616α = 90
b = 70.616β = 90
c = 69.092γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2012-02-22
    Changes: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 2.0: 2020-03-11
    Changes: Data collection, Derived calculations, Other, Polymer sequence
  • Version 2.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary