1GIC

CONCANAVALIN A COMPLEXED WITH METHYL ALPHA-D-GLUCOPYRANOSIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Structure solution of a cubic crystal of concanavalin A complexed with methyl alpha-D-glucopyranoside.

Harrop, S.J.Helliwell, J.R.Wan, T.C.Kalb, A.J.Tong, L.Yariv, J.

(1996) Acta Crystallogr D Biol Crystallogr 52: 143-155

  • DOI: https://doi.org/10.1107/S0907444995008742
  • Primary Citation of Related Structures:  
    1GIC

  • PubMed Abstract: 

    The solution of the cubic crystal form (a = 167.8 A) of concanavalin A complexed with the monosaccharide methyl alpha-D-glucopyranoside is described. The space group has been determined as I2(1)3 rather than I23. The use of cadmium to replace cobalt at the transition metal-ion binding site and to replace calcium at its binding site proved to be crucial to the successful solution of the crystal structure. The relatively small isomorphous signals of 21 e(-) for the replacement of cobalt and 28 e(-) for the replacement of calcium, yielded interpretable difference Patterson maps. The electron-density map calculated in space group I2(1)3 at 5.4 A resolution, based on phases derived from single- and double-substituted cadmium differences, revealed a classical concanavalin A tetramer of 222 point symmetry, as seen in all the known crystal structures of concanavalin A. Rigid-body refinement at 3.6 A using the refined coordinates of saccharide-free concanavalin A converged to an R factor of 27.4%. A molecular-replacement analysis, consistent with this crystal structure, and initial experiences in the incorrect space group I23 are described as these also prove to be instructive.


  • Organizational Affiliation

    Department of Chemistry, University of Manchester, England.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CONCANAVALIN A
A, B
237Canavalia ensiformisMutation(s): 0 
UniProt
Find proteins for P02866 (Canavalia ensiformis)
Explore P02866 
Go to UniProtKB:  P02866
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02866
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 
  • Space Group: I 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 167.8α = 90
b = 167.8β = 90
c = 167.8γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
XENGENdata reduction
MOSFLMdata reduction
CCP4data scaling
ROTAVATAdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-08-20
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description, Structure summary
  • Version 1.4: 2023-08-09
    Changes: Database references, Refinement description, Structure summary
  • Version 1.5: 2024-05-22
    Changes: Data collection