2VXQ

Crystal structure of the major grass pollen allergen Phl p 2 in complex with its specific IgE-Fab

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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This is version 1.3 of the entry. See complete history. 


Literature

High-Affinity Ige Recognition of a Conformational Epitope of the Major Respiratory Allergen Phl P 2 as Revealed by X-Ray Crystallography.

Padavattan, S., Flicker, S., Schirmer, T., Madritsch, C., Randow, S., Reese, G., Vieths, S., Lupinek, C., Ebner, C., Valenta, R., Markovic-Housley, Z.

(2009) J Immunol 182: 2141

  • DOI: 10.4049/jimmunol.0803018
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • We report the three-dimensional structure of the complex between the major respiratory grass pollen allergen Phl p 2 and its specific human IgE-derived Fab. The Phl p 2-specific human IgE Fab has been isolated from a combinatorial library constructed ...

    We report the three-dimensional structure of the complex between the major respiratory grass pollen allergen Phl p 2 and its specific human IgE-derived Fab. The Phl p 2-specific human IgE Fab has been isolated from a combinatorial library constructed from lymphocytes of a pollen allergic patient. When the variable domains of the IgE Fab were grafted onto human IgG1, the resulting Ab (huMab2) inhibited strongly the binding of allergic patients' IgE to Phl p 2 as well as allergen-induced basophil degranulation. Analysis of the binding of the allergen to the Ab by surface plasmon resonance yielded a very low dissociation constant (K(D) = 1.1 x 10(-10) M), which is similar to that between IgE and Fcepsilon;RI. The structure of the Phl p 2/IgE Fab complex was determined by x-ray crystallography to 1.9 A resolution revealing a conformational epitope (876 A(2)) comprised of the planar surface of the four-stranded anti-parallel beta-sheet of Phl p 2. The IgE-defined dominant epitope is discontinuous and formed by 21 residues located mostly within the beta strands. Of the 21 residues, 9 interact directly with 5 of the 6 CDRs (L1, L3, H1, H2, H3) of the IgE Fab predominantly by hydrogen bonding and van der Waals interactions. Our results indicate that IgE Abs recognize conformational epitopes with high affinity and provide a structural basis for the highly efficient effector cell activation by allergen/IgE immune complexes.

    Organizational Affiliation: 

    Division of Structural Biology, Biozentrum, University of Basel, Basel, Switzerland.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
FABL214Homo sapiensMutation(s): 0 
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POLLEN ALLERGEN PHL P 2A96Phleum pratenseMutation(s): 0 
Gene Names: PHLPII
Find proteins for P43214 (Phleum pratense)
Explore P43214 
Go to UniProtKB:  P43214
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
FABH216Homo sapiensMutation(s): 0 
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.437α = 90
b = 105.437β = 90
c = 110.225γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-04-10
    Changes: Advisory, Data collection, Other, Source and taxonomy
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation