5NZB

A disulfide switch determines proteolytic resistance in the birch pollen allergen Bet v 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 

wwPDB Validation   3D Report Full Report


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Literature

Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S.

Soh, W.T.Briza, P.Dall, E.Asam, C.Schubert, M.Huber, S.Aglas, L.Bohle, B.Ferreira, F.Brandstetter, H.

(2017) Int J Mol Sci 18

  • DOI: 10.3390/ijms18102156
  • Primary Citation of Related Structures:  
    5NZB, 5NZC

  • PubMed Abstract: 
  • Birch pollen allergy affects more than 20% of the European allergic population. On a molecular level, birch pollen allergy can be linked to the two dominant allergens Bet v 1 and Bet v 2. Bet v 2 belongs to the profilin family, which is abundant in the plant kingdom ...

    Birch pollen allergy affects more than 20% of the European allergic population. On a molecular level, birch pollen allergy can be linked to the two dominant allergens Bet v 1 and Bet v 2. Bet v 2 belongs to the profilin family, which is abundant in the plant kingdom. Importantly, the homologous plant profilins have a conserved cysteine motif with a currently unknown functional relevance. In particular, it is unknown whether the motif is relevant for disulfide formation and to what extent it would affect the profilins' structural, functional and immunological properties. Here we present crystal structures of Bet v 2 in the reduced and the oxidized state, i.e., without and with a disulfide bridge. Despite overall structural similarity, the two structures distinctly differ at their termini which are stabilized to each other in the oxidized, i.e., disulfide-linked state. These structural differences translate into differences in their proteolytic resistance. Whereas the oxidized Bet v 2 is rather resistant towards the endolysosomal protease cathepsin S, it is rapidly degraded in the reduced form. By contrast, both Bet v 2 forms exhibit similar immunological properties as evidenced by their binding to IgE antibodies from birch pollen allergic patients and by their ability to trigger histamine release in a humanized rat basophilic leukemia cells (RBL) assay, independent of the presence or absence of the disulfide bridge. Taken together our findings suggest that the oxidized Bet v 2 conformation should be the relevant species, with a much longer retention time to trigger immune responses.


    Organizational Affiliation

    Department of Molecular Biology, University of Salzburg, Salzburg 5020, Austria. hans.brandstetter@sbg.ac.at.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Profilin-2A132Betula pendulaMutation(s): 0 
UniProt
Find proteins for A4K9Z8 (Betula pendula)
Explore A4K9Z8 
Go to UniProtKB:  A4K9Z8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA4K9Z8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.763α = 90
b = 57.336β = 90
c = 59.041γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Cootmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Austrian Science FundAustriaproject W_01213

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-25
    Type: Initial release