2XOM

Atomic resolution structure of TmCBM61 in complex with beta-1,4- galactotriose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.95 Å
  • R-Value Free: 0.120 
  • R-Value Work: 0.104 
  • R-Value Observed: 0.105 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Recognition of the Helical Structure of Beta-1,4-Galactan by a New Family of Carbohydrate-Binding Modules.

Cid, M.Pedersen, H.L.Kaneko, S.Coutinho, P.M.Henrissat, B.Willats, W.G.T.Boraston, A.B.

(2010) J Biol Chem 285: 35999

  • DOI: 10.1074/jbc.M110.166330
  • Primary Citation of Related Structures:  
    2XOM, 2XON

  • PubMed Abstract: 
  • The microbial enzymes that depolymerize plant cell wall polysaccharides, ultimately promoting energy liberation and carbon recycling, are typically complex in their modularity and often contain carbohydrate-binding modules (CBMs). Here, through analysis of an unknown module from a Thermotoga maritima endo-β-1,4-galactanase, we identify a new family of CBMs that are most frequently found appended to proteins with β-1,4-galactanase activity ...

    The microbial enzymes that depolymerize plant cell wall polysaccharides, ultimately promoting energy liberation and carbon recycling, are typically complex in their modularity and often contain carbohydrate-binding modules (CBMs). Here, through analysis of an unknown module from a Thermotoga maritima endo-β-1,4-galactanase, we identify a new family of CBMs that are most frequently found appended to proteins with β-1,4-galactanase activity. Polysaccharide microarray screening, immunofluorescence microscopy, and biochemical analysis of the isolated module demonstrate the specificity of the module, here called TmCBM61, for β-1,4-linked galactose-containing ligands, making it the founding member of family CBM61. The ultra-high resolution X-ray crystal structures of TmCBM61 (0.95 and 1.4 Å resolution) in complex with β-1,4-galactotriose reveal the molecular basis of the specificity of the CBM for β-1,4-galactan. Analysis of these structures provides insight into the recognition of an unexpected helical galactan conformation through a mode of binding that resembles the recognition of starch.


    Organizational Affiliation

    Department Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ARABINOGALACTAN ENDO-1,4-BETA-GALACTOSIDASEA152Thermotoga maritimaMutation(s): 0 
EC: 3.2.1.89
UniProt
Find proteins for Q9X0S8 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0S8 
Go to UniProtKB:  Q9X0S8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0S8
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-galactopyranose-(1-4)-beta-D-galactopyranose-(1-4)-beta-D-galactopyranoseB 3N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G06996VN
GlyCosmos:  G06996VN
GlyGen:  G06996VN
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
C [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.95 Å
  • R-Value Free: 0.120 
  • R-Value Work: 0.104 
  • R-Value Observed: 0.105 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.915α = 90
b = 31.92β = 128.28
c = 67.79γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
ACORNphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-09-08
    Type: Initial release
  • Version 1.1: 2011-05-12
    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: Atomic model, Data collection, Derived calculations, Other, Structure summary