1WUV

Crystal structure of native Canavalia gladiata lectin (CGL): a tetrameric ConA-like lectin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

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


Literature

Structure of a lectin from Canavalia gladiata seeds: new structural insights for old molecules

Delatorre, P.Rocha, B.A.M.Souza, E.P.Oliveira, T.M.Bezerra, G.A.Moreno, F.B.M.B.Freitas, B.T.Santi-Gadelha, T.Sampaio, A.H.Azevedo Jr., W.F.Cavada, B.S.

(2007) BMC Struct Biol 7: 52-52

  • DOI: https://doi.org/10.1186/1472-6807-7-52
  • Primary Citation of Related Structures:  
    1WUV, 2D7F

  • PubMed Abstract: 

    Lectins are mainly described as simple carbohydrate-binding proteins. Previous studies have tried to identify other binding sites, which possible recognize plant hormones, secondary metabolites, and isolated amino acid residues. We report the crystal structure of a lectin isolated from Canavalia gladiata seeds (CGL), describing a new binding pocket, which may be related to pathogen resistance activity in ConA-like lectins; a site where a non-protein amino-acid, alpha-aminobutyric acid (Abu), is bound. The overall structure of native CGL and complexed with alpha-methyl-mannoside and Abu have been refined at 2.3 A and 2.31 A resolution, respectively. Analysis of the electron density maps of the CGL structure shows clearly the presence of Abu, which was confirmed by mass spectrometry. The presence of Abu in a plant lectin structure strongly indicates the ability of lectins on carrying secondary metabolites. Comparison of the amino acids composing the site with other legume lectins revealed that this site is conserved, providing an evidence of the biological relevance of this site. This new action of lectins strengthens their role in defense mechanisms in plants.


  • Organizational Affiliation

    Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Ceará, Brazil. plinio@urca.br


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Concanavalin AA,
B [auth D],
C [auth G],
D [auth J]
237Canavalia gladiataMutation(s): 0 
UniProt
Find proteins for P14894 (Canavalia gladiata)
Explore P14894 
Go to UniProtKB:  P14894
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14894
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.903α = 90
b = 115.351β = 90
c = 241.078γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
MOLREPphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-18
    Type: Initial release
  • Version 1.1: 2007-11-21
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy