3S7E

Crystal structure of Ara h 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1074/jbc.M111.270132
  • Primary Citation of Related Structures:  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 bioinforma ...

    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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Allergen Ara h 1, clone P41B
A, B
418Arachis hypogaeaN/A
Find proteins for P43238 (Arachis hypogaea)
Go to UniProtKB:  P43238
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.236 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 93.368α = 90.00
b = 93.368β = 90.00
c = 237.111γ = 120.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-3000data collection
HKL-3000phasing
REFMACrefinement
CCP4refinement
HKL-2000data reduction
HKL-2000data scaling
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-12-14
    Type: Database references