2CN3

Crystal Structures of Clostridium thermocellum Xyloglucanase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

wwPDB Validation 3D Report Full Report



Literature

Crystal Structures of Clostridium Thermocellum Xyloglucanase, Xgh74A, Reveal the Structural Basis for Xyloglucan Recognition and Degradation

Martinez-Fleites, C.Taylor, E.J.Guerreiro, C.I.P.D.Prates, J.A.M.Ferreira, L.M.A.Fontes, C.M.G.A.Baumann, M.J.Brumer, H.Davies, G.J.

(2006) J Biol Chem 281: 24922

  • DOI: 10.1074/jbc.M603583200
  • Primary Citation of Related Structures:  
    2CN3, 2CN2

  • PubMed Abstract: 
  • The enzymatic degradation of the plant cell wall is central both to the natural carbon cycle and, increasingly, to environmentally friendly routes to biomass conversion, including the production of biofuels. The plant cell wall is a complex composite ...

    The enzymatic degradation of the plant cell wall is central both to the natural carbon cycle and, increasingly, to environmentally friendly routes to biomass conversion, including the production of biofuels. The plant cell wall is a complex composite of cellulose microfibrils embedded in diverse polysaccharides collectively termed hemicelluloses. Xyloglucan is one such polysaccharide whose hydrolysis is catalyzed by diverse xyloglucanases. Here we present the structure of the Clostridium thermocellum xyloglucanase Xgh74A in both apo and ligand-complexed forms. The structures, in combination with mutagenesis data on the catalytic residues and the kinetics and specificity of xyloglucan hydrolysis reveal a complex subsite specificity accommodating seventeen monosaccharide moieties of the multibranched substrate in an open substrate binding terrain.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemitry, University of York, York YO10 5YW, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-1,4-XYLOGLUCAN HYDROLASEA, B737Hungateiclostridium thermocellumMutation(s): 1 
Gene Names: xghA
EC: 3.2.1.151 (PDB Primary Data), 3.2.1 (UniProt)
Find proteins for Q70DK5 (Hungateiclostridium thermocellum)
Explore Q70DK5 
Go to UniProtKB:  Q70DK5
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation
alpha-D-xylopyranose-(1-6)-beta-D-glucopyranose-(1-4)-[alpha-D-xylopyranose-(1-6)]beta-D-glucopyranose-(1-4)-[beta-D-galactopyranose-(1-2)-alpha-D-xylopyranose-(1-6)]beta-D-glucopyranose-(1-4)-alpha-D-glucopyranose
C, E, F
8 N/A
Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation
alpha-D-xylopyranose-(1-6)-beta-D-glucopyranose-(1-4)-[beta-D-galactopyranose-(1-2)-alpha-D-xylopyranose-(1-6)]beta-D-glucopyranose-(1-4)-[beta-D-galactopyranose-(1-2)-alpha-D-xylopyranose-(1-6)]beta-D-glucopyranose-(1-4)-alpha-D-glucopyranose
D
9 N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.44α = 90
b = 141.44β = 90
c = 193.393γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-22
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary