2WKK

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.150 

wwPDB Validation 3D Report Full Report


This is version 1.1 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: 10.1371/journal.ppat.1000717

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GALECTIN-2
A, B, C, D
150Coprinopsis cinereaMutation(s): 0 
Gene Names: Cgl2
Find proteins for Q9P4R8 (Coprinopsis cinerea)
Go to UniProtKB:  Q9P4R8
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FUC
Query on FUC

Download SDF File 
Download CCD File 
A, B, C, D
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
GAL
Query on GAL

Download SDF File 
Download CCD File 
A, B, C, D
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
B, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.150 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 66.210α = 90.00
b = 80.620β = 90.00
c = 120.630γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
MOLREPphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-19
    Type: Initial release
  • Version 1.1: 2015-01-21
    Type: Atomic model, Derived calculations, Non-polymer description, Other, Version format compliance