5FEG

Crystal structure of the dimeric allergen profilin (Hev b 8)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural insights into the IgE mediated responses induced by the allergens Hev b 8 and Zea m 12 in their dimeric forms.

Mares-Mejia, I., Martinez-Caballero, S., Garay-Canales, C., Cano-Sanchez, P., Torres-Larios, A., Lara-Gonzalez, S., Ortega, E., Rodriguez-Romero, A.

(2016) Sci Rep 6: 32552-32552

  • DOI: 10.1038/srep32552
  • Primary Citation of Related Structures:  
    5FDS, 5FEF, 5FEG

  • PubMed Abstract: 

    • Oligomerization of allergens plays an important role in IgE-mediated reactions, as effective crosslinking of IgE- FcεRI complexes on the cell membrane is dependent on the number of exposed B-cell epitopes in a single allergen molecule or on the occurrence of identical epitopes in a symmetrical arrangement ...

    Oligomerization of allergens plays an important role in IgE-mediated reactions, as effective crosslinking of IgE- FcεRI complexes on the cell membrane is dependent on the number of exposed B-cell epitopes in a single allergen molecule or on the occurrence of identical epitopes in a symmetrical arrangement. Few studies have attempted to experimentally demonstrate the connection between allergen dimerization and the ability to trigger allergic reactions. Here we studied plant allergenic profilins rHev b 8 (rubber tree) and rZea m 12 (maize) because they represent an important example of cross-reactivity in the latex-pollen-food syndrome. Both allergens in their monomeric and dimeric states were isolated and characterized by exclusion chromatography and mass spectrometry and were used in immunological in vitro experiments. Their crystal structures were solved, and for Hev b 8 a disulfide-linked homodimer was found. Comparing the structures we established that the longest loop is relevant for recognition by IgE antibodies, whereas the conserved regions are important for cross-reactivity. We produced a novel monoclonal murine IgE (mAb 2F5), specific for rHev b 8, which was useful to provide evidence that profilin dimerization considerably increases the IgE-mediated degranulation in rat basophilic leukemia cells.

    Organizational Affiliation: 

    Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Cd. Universitaria, Coyoacán, Ciudad de México, 04510.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Profilin-2A, B131Hevea brasiliensisMutation(s): 0 
Gene Names: PRO2
UniProt
Find proteins for Q9STB6 (Hevea brasiliensis)
Explore Q9STB6 
Go to UniProtKB:  Q9STB6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9STB6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.558α = 90
b = 58.558β = 90
c = 87.34γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
DGAPA-UNAMMexicoIN207613
Consejo Nacional de Ciencia y Tecnologia (CONACYT)Mexico166472

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence, Data collection, Derived calculations