1H1A

Thermophilic beta-1,4-xylanase from Chaetomium thermophilum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Three-Dimensional Structures of Thermophilic Beta-1,4-Xylanases from Chaetomium Thermophilum and Nonomuraea Flexuosa. Comparison of Twelve Xylanases in Relation to Their Thermal Stability.

Hakulinen, N.Turunen, O.Janis, J.Leisola, M.Rouvinen, J.

(2003) Eur J Biochem 270: 1399-1412

  • DOI: 10.1046/j.1432-1033.2003.03496.x
  • Primary Citation of Related Structures:  
    1H1A, 1M4W

  • PubMed Abstract: 
  • The crystal structures of thermophilic xylanases from Chaetomium thermophilum and Nonomuraea flexuosa were determined at 1.75 and 2.1 A resolution, respectively. Both enzymes have the overall fold typical to family 11 xylanases with two highly twisted beta-sheets forming a large cleft ...

    The crystal structures of thermophilic xylanases from Chaetomium thermophilum and Nonomuraea flexuosa were determined at 1.75 and 2.1 A resolution, respectively. Both enzymes have the overall fold typical to family 11 xylanases with two highly twisted beta-sheets forming a large cleft. The comparison of 12 crystal structures of family 11 xylanases from both mesophilic and thermophilic organisms showed that the structures of different xylanases are very similar. The sequence identity differences correlated well with the structural differences. Several minor modifications appeared to be responsible for the increased thermal stability of family 11 xylanases: (a) higher Thr : Ser ratio (b) increased number of charged residues, especially Arg, resulting in enhanced polar interactions, and (c) improved stabilization of secondary structures involved the higher number of residues in the beta-strands and stabilization of the alpha-helix region. Some members of family 11 xylanases have a unique strategy to improve their stability, such as a higher number of ion pairs or aromatic residues on protein surface, a more compact structure, a tighter packing, and insertions at some regions resulting in enhanced interactions.


    Organizational Affiliation

    Department of Chemistry, University of Joensuu, Finland; Helsinki University of Technology, Finland. Nina.Hakulinen@joensuu.fi



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endo-1,4-beta-xylanaseA, B191Chaetomium thermophilumMutation(s): 0 
Gene Names: xyn11A
EC: 3.2.1.8
Find proteins for Q8J1V6 (Chaetomium thermophilum)
Explore Q8J1V6 
Go to UniProtKB:  Q8J1V6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
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: 1.75 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.24α = 90
b = 57.15β = 90
c = 65.68γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-04
    Type: Initial release
  • Version 1.1: 2011-09-28
    Changes: Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance
  • Version 1.2: 2018-06-13
    Changes: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 1.3: 2018-06-20
    Changes: Data collection, Structure summary
  • Version 2.0: 2020-03-11
    Changes: Derived calculations, Other, Polymer sequence