Pterocarpus angolensis lectin complexed with turanose

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.188 

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This is version 2.1 of the entry. See complete history


Crystal structure of Pterocarpus angolensis lectin in complex with glucose, sucrose, and turanose

Loris, R.Imberty, A.Beeckmans, S.Van Driessche, E.Read, J.S.Bouckaert, J.De Greve, H.Buts, L.Wyns, L.

(2003) J Biol Chem 278: 16297-16303

  • DOI: https://doi.org/10.1074/jbc.M211148200
  • Primary Citation of Related Structures:  
    1N3O, 1N3P, 1N3Q

  • PubMed Abstract: 

    The crystal structure of the Man/Glc-specific seed lectin from Pterocarpus angolensis was determined in complex with methyl-alpha-d-glucose, sucrose, and turanose. The carbohydrate binding site contains a classic Man/Glc type specificity loop. Its metal binding loop on the other hand is of the long type, different from what is observed in other Man/Glc-specific legume lectins. Glucose binding in the primary binding site is reminiscent of the glucose complexes of concanavalin A and lentil lectin. Sucrose is found to be bound in a conformation similar as seen in the binding site of lentil lectin. A direct hydrogen bond between Ser-137(OG) to Fru(O2) in Pterocarpus angolensis lectin replaces a water-mediated interaction in the equivalent complex of lentil lectin. In the turanose complex, the binding site of the first molecule in the asymmetric unit contains the alphaGlc1-3betaFruf form of furanose while the second molecule contains the alphaGlc1-3betaFrup form in its binding site.

  • Organizational Affiliation

    Laboratorium voor Ultrastructuur, Instituut voor Moleculaire Biologie, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium. reloris@vub.ac.be

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
lectin PAL
A, B
252Pterocarpus angolensisMutation(s): 0 
Find proteins for Q8GSD2 (Pterocarpus angolensis)
Explore Q8GSD2 
Go to UniProtKB:  Q8GSD2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8GSD2
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G42009OT
GlyCosmos:  G42009OT
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G47842AW
GlyCosmos:  G47842AW
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.66α = 90
b = 83.23β = 90
c = 123.16γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-11-20
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2024-03-13
    Changes: Data collection, Database references, Structure summary