5NZC

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.999 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

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:  

  • 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 t ...

    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. waituck.soh@sbg.ac.at.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Profilin-2
A, B
132Betula pendulaMutation(s): 0 
Find proteins for A4K9Z8 (Betula pendula)
Go to UniProtKB:  A4K9Z8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.999 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.206 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 74.402α = 90.00
b = 90.521β = 90.00
c = 83.172γ = 90.00
Software Package:
Software NamePurpose
Cootmodel building
PHENIXrefinement
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Austrian Science FundAustriaproject W_01213

Revision History 

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