Structure of Beta-1,4-Galactanase

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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Investigating the Binding of Beta-1,4-Galactan to Bacillus Licheniformis Beta-1,4-Galactanase by Crystallography and Computational Modeling.

Le Nours, J.De Maria, L.Welner, D.Jorgensen, C.T.Christensen, L.L.H.Borchert, T.V.Larsen, S.Lo Leggio, L.

(2009) Proteins 75: 977

  • DOI: https://doi.org/10.1002/prot.22310
  • Primary Citation of Related Structures:  
    2CCR, 2J74

  • PubMed Abstract: 

    Microbial beta-1,4-galactanases are glycoside hydrolases belonging to family 53, which degrade galactan and arabinogalactan side chains in the hairy regions of pectin, a major plant cell wall component. They belong to the larger clan GH-A of glycoside hydrolases, which cover many different poly- and oligosaccharidase specificities. Crystallographic complexes of Bacillus licheniformis beta-1,4-galactanase and its inactive nucleophile mutant have been obtained with methyl-beta(1-->4)-galactotetraoside, providing, for the first time, information on substrate binding to the aglycone side of the beta-1,4-galactanase substrate binding groove. Using the experimentally determined subsites as a starting point, a beta(1-->4)-galactononaose was built into the structure and subjected to molecular dynamics simulations giving further insight into the residues involved in the binding of the polysaccharide from subsite -4 to +5. In particular, this analysis newly identified a conserved beta-turn, which contributes to subsites -2 to +3. This beta-turn is unique to family 53 beta-1,4-galactanases among all clan GH-A families that have been structurally characterized and thus might be a structural signature for endo-beta-1,4-galactanase specificity.

  • Organizational Affiliation

    Biophysical Chemistry Group, Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
399Bacillus licheniformisMutation(s): 0 
Find proteins for Q65CX5 (Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / CCUG 7422 / NBRC 12200 / NCIMB 9375 / NCTC 10341 / NRRL NRS-1264 / Gibson 46))
Explore Q65CX5 
Go to UniProtKB:  Q65CX5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ65CX5
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
C, E
Glycosylation Resources
GlyTouCan:  G06996VN
GlyCosmos:  G06996VN
GlyGen:  G06996VN
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
D, F
Glycosylation Resources
GlyTouCan:  G08806VI
GlyCosmos:  G08806VI
GlyGen:  G08806VI
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.37α = 90
b = 80.64β = 99.29
c = 104.44γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-21
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-17
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Other, Structure summary
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary