2X2S

Crystal structure of Sclerotinia sclerotiorum agglutinin SSA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.141 

Starting Model: in silico
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This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of the Galnac/Gal-Specific Agglutinin from the Phytopathogenic Ascomycete Sclerotinia Sclerotiorum Reveals Novel Adaptation of a Beta-Trefoil Domain

Sulzenbacher, G.Roig-Zamboni, V.Peumans, W.J.Rouge, P.Van Damme, E.J.M.Bourne, Y.

(2010) J Mol Biol 400: 715

  • DOI: https://doi.org/10.1016/j.jmb.2010.05.038
  • Primary Citation of Related Structures:  
    2X2S, 2X2T

  • PubMed Abstract: 

    A lectin from the phytopathogenic ascomycete Sclerotinia sclerotiorum that shares only weak sequence similarity with characterized fungal lectins has recently been identified. S. sclerotiorum agglutinin (SSA) is a homodimeric protein consisting of two identical subunits of approximately 17 kDa and displays specificity primarily towards Gal/GalNAc. Glycan array screening indicates that SSA readily interacts with Gal/GalNAc-bearing glycan chains. The crystal structures of SSA in the ligand-free form and in complex with the Gal-beta1,3-GalNAc (T-antigen) disaccharide have been determined at 1.6 and 1.97 A resolution, respectively. SSA adopts a beta-trefoil domain as previously identified for other carbohydrate-binding proteins of the ricin B-like lectin superfamily and accommodates terminal non-reducing galactosyl and N-acetylgalactosaminyl glycans. Unlike other structurally related lectins, SSA contains a single carbohydrate-binding site at site alpha. SSA reveals a novel dimeric assembly markedly dissimilar to those described earlier for ricin-type lectins. The present structure exemplifies the adaptability of the beta-trefoil domain in the evolution of fungal lectins.


  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques UMR-6098 CNRS, Université Aix-Marseille, Campus Luminy, Case 932, F-13288 Marseille cedex 09, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AGGLUTININ
A, B, C, D
153Sclerotinia sclerotiorumMutation(s): 0 
UniProt
Find proteins for A7XUK7 (Sclerotinia sclerotiorum)
Explore A7XUK7 
Go to UniProtKB:  A7XUK7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA7XUK7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.141 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.318α = 90
b = 127.318β = 90
c = 86.652γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-26
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description