4bkc

Crystal Structure of a unusually linked dimeric variant of Bet v 1

spinqualitylabelsall models 4bkc, resolution 1.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4bkc is a 2 chain structure with sequence from Betpn. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: TSY Related: 4bk6, 4bk7, 4bkd Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [BEV1A_BETPN] May be a general steroid carrier protein (By similarity). Publication Abstract from PubMed Many allergens share several biophysical characteristics, including the capability to undergo oligomerisation. The dimerization mechanism in Bet v 1 and its allergenic properties are so far poorly understood. Here, we report crystal structures of dimeric Bet v 1, revealing a non-canonical incorporation of cysteine at position 5 instead of genetically encoded tyrosine. Cysteine polysulfide bridging stabilized different dimeric assemblies, depending on the polysulfide linker length. These dimers represent quaternary arrangements that are frequently observed in related proteins, reflecting their prevalence in unmodified Bet v 1. These conclusions were corroborated by characteristic immunologic properties of monomeric and dimeric allergen variants. Hereby, residue 5 could be identified as an allergenic hot spot in Bet v 1. The presented results refine fundamental principles in protein chemistry, and emphasize the importance of protein modifications in understanding the molecular basis of allergenicity. Stabilization of the dimeric birch pollen allergen Bet v 1 impacts its immunological properties.,Kofler S, Ackaert C, Samonig M, Asam C, Briza P, Horejs-Hoeck J, Cabrele C, Ferreira F, Duschl A, Huber C, Brandstetter H J Biol Chem. 2013 Nov 19. PMID:24253036 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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