1S3K

Crystal Structure of a Humanized Fab (hu3S193) in Complex with the Lewis Y Tetrasaccharide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Structural convergence of antibody binding of carbohydrate determinants in lewis y tumor antigens

Ramsland, P.A.Farrugia, W.Bradford, T.M.Hogarth, P.M.Scott, A.M.

(2004) J Mol Biol 340: 809-818

  • DOI: https://doi.org/10.1016/j.jmb.2004.05.037
  • Primary Citation of Related Structures:  
    1S3K

  • PubMed Abstract: 

    Antibodies targeting human epithelial carcinomas bearing Lewis Y (Le(y)) carbohydrate antigens provide a striking illustration of convergent immune recognition. We report a 1.9A resolution crystal structure of the Fab of a humanized antibody (hu3S193) in complex with the Le(y) tetrasaccharide, Fuc(alpha 1-->2)Gal(beta 1-->4)[Fuc(alpha 1-->3)]GlcNAc. Comparisons of the hu3S193 and BR96 antibodies bound to Le(y) tumor antigens revealed extremely similar mechanisms for recognition of the carbohydrate epitopes. Solvent plays a critical role in hu3S193 antibody binding to the Le(y) carbohydrate epitope. Specificity for Le(y) is maintained because a conserved pocket accepts an N-acetyl group of the core Gal(beta 1-->4)GlcNAc disaccharide. Closely related blood-group determinants (Le(a) and Le(b)) cannot enter the specificity pocket, making the Le(y) antibodies promising candidates for immunotherapy of epithelial cancer.


  • Organizational Affiliation

    Structural Immunology Laboratory, Austin Research Institute, Heidelberg, Vic. 3084, Australia. p.ramsland@ari.unimelb.edu.au


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HU3S193 Fab fragment, light chainA [auth L]219Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
HU3S193 Fab fragment, heavy chainB [auth H]222Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-2)-beta-D-galactopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-alpha-D-glucopyranoseC [auth A]4N/A
Glycosylation Resources
GlyTouCan:  G82236PZ
GlyCosmos:  G82236PZ
GlyGen:  G82236PZ
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
D [auth L]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.758α = 90
b = 71.758β = 90
c = 90.142γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2020-01-01
    Changes: Data collection, Derived calculations, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-10-25
    Changes: Data collection, Database references, Refinement description, Structure summary