3EBK

Crystal structure of major allergens, Bla g 4 from cockroaches


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.218 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of two major allergens, Bla g 4 and Per a 4, from cockroaches and their IgE binding epitopes.

Tan, Y.W.Chan, S.L.Ong, T.C.Yit, L.Y.Tiong, Y.S.Chew, F.T.Sivaraman, J.Mok, Y.K.

(2008) J Biol Chem 284: 3148-3157

  • DOI: https://doi.org/10.1074/jbc.M807209200
  • Primary Citation of Related Structures:  
    3EBK, 3EBW

  • PubMed Abstract: 
  • Inhalant allergens from cockroaches are an important cause of asthma to millions of individuals worldwide. Here we report for the first time the structures of two major cockroach allergens, Bla g 4 and Per a 4, that adopt a typical lipocalin fold but with distinct structural features as compared with other known lipocalin allergens ...

    Inhalant allergens from cockroaches are an important cause of asthma to millions of individuals worldwide. Here we report for the first time the structures of two major cockroach allergens, Bla g 4 and Per a 4, that adopt a typical lipocalin fold but with distinct structural features as compared with other known lipocalin allergens. Both Bla g 4 and Per a 4 contain two long-range disulfide bonds linking the N and C termini to a beta-barrel. The C-terminal helix of Bla g 4 is bent and greatly extended toward the N terminus. Bla g 4 is found to be a monomer, whereas Per a 4 exists as a dimer in solution with a novel dimeric interface involving residues from loops at the top and bottom of the beta-barrel. Putative ligand binding sites of both allergens are determined by docking of the juvenile hormone III inside the beta-barrel and found to interact with the ligand using non-conserved residues. Bla g 4 and Per a 4 are found to be cross-reactive in sera IgE binding, at least in the Singaporean Chinese population tested. A major IgE binding epitope unique to Per a 4 is found on the loops at the bottom of the beta-barrel that may aid the development of hypoallergens for immunotherapy.


    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Singapore 17543. Electronic address: dbsmokh@nus.edu.sg.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Allergen Bla g 4A, B176Blattella germanicaMutation(s): 0 
UniProt
Find proteins for P54962 (Blattella germanica)
Explore P54962 
Go to UniProtKB:  P54962
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP54962
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.218 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.166α = 90
b = 60.166β = 90
c = 124.93γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement
PDB_EXTRACTdata extraction
CBASSdata collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description