2CGY

STRUCTURE OF HELIX POMATIA AGGLUTININ WITH FORSMANN ANTIGEN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.265 

wwPDB Validation 3D Report Full Report



Literature

Structural Basis for Recognition of Breast and Colon Cancer Epitopes Tn Antigen and Forssman Disaccharide by Helix Pomatia Lectin.

Lescar, J.Sanchez, J.-F.Audfray, A.Coll, J.Breton, C.Mitchell, E.P.Imberty, A.

(2007) Glycobiology 17: 1077

  • DOI: 10.1093/glycob/cwm077
  • Primary Citation of Related Structures:  
    2CGZ, 2CGY

  • PubMed Abstract: 
  • Helix pomatia agglutinin (HPA) is a lectin that has been used extensively in histopathology, since its binding to tissue sections from breast and colon cancers is correlated with the worst prognosis for the patients. The lectin recognizes alpha-d-N-a ...

    Helix pomatia agglutinin (HPA) is a lectin that has been used extensively in histopathology, since its binding to tissue sections from breast and colon cancers is correlated with the worst prognosis for the patients. The lectin recognizes alpha-d-N-acetylgalactosamine (alphaGalNAc) containing epitopes which are only present in cancer cell lines having a high likelihood to undergo metastasis, such as the HT29 cancer colon cell line. Several breast cancer cell lines have also been shown to be labeled, although IGROV1, an ovarian cancer cell line, is not. Inhibition studies, using GalNAc monosaccharides, are reported here, showing that the labeling is dependent upon the presence of carbohydrate epitopes. The crystal structures of the lectin complexed with two GalNAc containing epitopes associated with cancer, the Tn (alphaGalNAc-Ser) and Forssman (alphaGalNAc1-3GalNAc) antigens, show the lectin's specificity for GalNAc is due to a particular network of hydrogen bonds. A histidine residue makes hydrophobic contact with the aglycon, rationalizing the preference for GalNAc bearing an additional sugar or amino acid in the alpha position. These structures provide the molecular basis for the use of HPA in metastasis research.


    Organizational Affiliation

    Centre de Recherches sur les Macromolécules Végétales, CNRS, BP53, 38041 Grenoble Cedex 09, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AGGLUTININA101Helix pomatiaMutation(s): 0 
Gene Names: hpa
Find proteins for Q2F1K8 (Helix pomatia)
Explore Q2F1K8 
Go to UniProtKB:  Q2F1K8
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation
2-acetamido-2-deoxy-alpha-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-galactopyranose
B
2 N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
A
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900083
Query on PRD_900083
BForssman antigen fragmentOligosaccharide /  Antigen

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.265 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.019α = 90
b = 62.019β = 90
c = 106.642γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-03-13
    Type: Initial release
  • Version 1.1: 2011-09-28
    Changes: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary