2WKK

Identification of the glycan target of the nematotoxic fungal galectin CGL2 in Caenorhabditis elegans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Caenorhabditis Elegans N-Glycan Core Beta-Galactoside Confers Sensitivity Towards Nematotoxic Fungal Galectin Cgl2.

Butschi, A.Titz, A.Walti, M.A.Olieric, V.Paschinger, K.Nobauer, K.Guo, X.Seeberger, P.H.Wilson, I.B.H.Aebi, M.Hengartner, M.O.Kunzler, M.

(2010) PLoS Pathog 6: E717

  • DOI: https://doi.org/10.1371/journal.ppat.1000717
  • Primary Citation of Related Structures:  
    2WKK

  • PubMed Abstract: 

    The physiological role of fungal galectins has remained elusive. Here, we show that feeding of a mushroom galectin, Coprinopsis cinerea CGL2, to Caenorhabditis elegans inhibited development and reproduction and ultimately resulted in killing of this nematode. The lack of toxicity of a carbohydrate-binding defective CGL2 variant and the resistance of a C. elegans mutant defective in GDP-fucose biosynthesis suggested that CGL2-mediated nematotoxicity depends on the interaction between the galectin and a fucose-containing glycoconjugate. A screen for CGL2-resistant worm mutants identified this glycoconjugate as a Galbeta1,4Fucalpha1,6 modification of C. elegans N-glycan cores. Analysis of N-glycan structures in wild type and CGL2-resistant nematodes confirmed this finding and allowed the identification of a novel putative glycosyltransferase required for the biosynthesis of this glycoepitope. The X-ray crystal structure of a complex between CGL2 and the Galbeta1,4Fucalpha1,6GlcNAc trisaccharide at 1.5 A resolution revealed the biophysical basis for this interaction. Our results suggest that fungal galectins play a role in the defense of fungi against predators by binding to specific glycoconjugates of these organisms.


  • Organizational Affiliation

    Institute of Molecular Biology, University of Zürich, Zürich, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GALECTIN-2
A, B, C, D
150Coprinopsis cinereaMutation(s): 0 
UniProt
Find proteins for Q9P4R8 (Coprinopsis cinerea)
Explore Q9P4R8 
Go to UniProtKB:  Q9P4R8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9P4R8
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-alpha-L-fucopyranose
E
2N/A
Glycosylation Resources
GlyTouCan:  G61266PA
GlyCosmos:  G61266PA
GlyGen:  G61266PA
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose
F, G
3N/A
Glycosylation Resources
GlyTouCan:  G60087WL
GlyCosmos:  G60087WL
GlyGen:  G60087WL
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-2)-alpha-L-fucopyranose
H
2N/A
Glycosylation Resources
GlyTouCan:  G23386LT
GlyCosmos:  G23386LT
GlyGen:  G23386LT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.21α = 90
b = 80.62β = 90
c = 120.63γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2010-01-19
    Type: Initial release
  • Version 1.1: 2015-01-21
    Changes: Atomic model, Derived calculations, Non-polymer description, Other, 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
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary