1H1A

Thermophilic b-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 

wwPDB Validation 3D Report Full Report


This is version 1.1 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

  • Primary Citation of Related Structures:  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 twiste ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDOXYLANASE 11A
A, B
191Chaetomium thermophilumGene Names: xyn11A
EC: 3.2.1.8
Find proteins for Q8J1V6 (Chaetomium thermophilum)
Go to UniProtKB:  Q8J1V6
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
UNX
Query on UNX

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A, B
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A, B
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 108.240α = 90.00
b = 57.150β = 90.00
c = 65.680γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-07-04
    Type: Initial release
  • Version 1.1: 2011-09-28
    Type: Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance