Crystal structure of Ara h 1

Experimental Data Snapshot

  • Resolution: 2.71 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history


Structural and Immunologic Characterization of Ara h 1, a Major Peanut Allergen.

Chruszcz, M.Maleki, S.J.Majorek, K.A.Demas, M.Bublin, M.Solberg, R.Hurlburt, B.K.Ruan, S.Mattisohn, C.P.Breiteneder, H.Minor, W.

(2011) J Biol Chem 286: 39318-39327

  • DOI: https://doi.org/10.1074/jbc.M111.270132
  • Primary Citation of Related Structures:  
    3S7E, 3S7I

  • PubMed Abstract: 

    Allergic reactions to peanuts and tree nuts are major causes of anaphylaxis in the United States. We compare different properties of natural and recombinant versions of Ara h 1, a major peanut allergen, through structural, immunologic, and bioinformatics analyses. Small angle x-ray scattering studies show that natural Ara h 1 forms higher molecular weight aggregates in solution. In contrast, the full-length recombinant protein is partially unfolded and exists as a monomer. The crystal structure of the Ara h 1 core (residues 170-586) shows that the central part of the allergen has a bicupin fold, which is in agreement with our bioinformatics analysis. In its crystalline state, the core region of Ara h 1 forms trimeric assemblies, while in solution the protein exists as higher molecular weight assemblies. This finding reveals that the residues forming the core region of the protein are sufficient for formation of Ara h 1 trimers and higher order oligomers. Natural and recombinant variants of proteins tested in in vitro gastric and duodenal digestion assays show that the natural protein is the most stable form, followed by the recombinant Ara h 1 core fragment and the full-length recombinant protein. Additionally, IgE binding studies reveal that the natural and recombinant allergens have different patterns of interaction with IgE antibodies. The molecular basis of cross-reactivity between vicilin allergens is also elucidated.

  • Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908, USA. maks@iwonka.med.virginia.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Allergen Ara h 1, clone P41B
A, B
418Arachis hypogaeaMutation(s): 0 
Find proteins for P43238 (Arachis hypogaea)
Explore P43238 
Go to UniProtKB:  P43238
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43238
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.71 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.368α = 90
b = 93.368β = 90
c = 237.111γ = 120
Software Package:
Software NamePurpose
HKL-3000data collection
Cootmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-12-14
    Changes: Database references
  • Version 1.2: 2022-04-13
    Changes: Database references, Derived calculations, Structure summary
  • Version 1.3: 2023-09-13
    Changes: Data collection, Refinement description