Crystal structure of the major allergen from fire ant venom, Sol i 3

Experimental Data Snapshot

  • Resolution: 3.05 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

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Crystal Structure of the Major Allergen from Fire Ant Venom, Sol I 3

Padavattan, S.Schmidt, M.Hoffman, D.R.Markovic-Housley, Z.

(2008) J Mol Biol 383: 178

  • DOI: https://doi.org/10.1016/j.jmb.2008.08.023
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Fire ant venom is an extremely potent allergy-inducing agent containing four major allergens, Sol i 1 to Sol i 4, which are the most frequent cause of hypersensitivity reactions to hymenoptera in the southern USA. The crystal structure of recombinant (Baculovirus) major fire ant allergen Sol i 3 has been determined to a resolution of 3.1 A by the method of molecular replacement. The secondary-structure elements of Sol i 3 are arranged in an alpha-beta-alpha sandwich fold consisting of a central antiparallel beta-sheet surrounded on both sides by alpha helices. The overall structure is very similar to that of the homologous wasp venom allergen Ves v 5 with major differences occurring in the solvent-exposed loop regions that contain amino acid insertions. Consequently, the limited conservation of surface chemical properties and topology between Sol i 3 and Ves v 5 may explain the observed lack of relevant cross-reactivity. It is concluded that Sol i 3 recognizes immunoglobulin E antibodies with a distinct set of its own epitopes, which are different from those of Ves v 5. Indeed, the molecular area in Sol i 3 covered by non-conserved residues is large enough to accommodate four unique Sol i 3 epitopes.

  • Organizational Affiliation

    Department of Structural Biology, Biozentrum, University of Basel, CH-4056 Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
218Solenopsis invictaMutation(s): 0 
Find proteins for P35778 (Solenopsis invicta)
Explore P35778 
Go to UniProtKB:  P35778
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35778
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.05 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.355α = 90
b = 93.355β = 90
c = 144.051γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-05-15
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description