1k9u
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(New page: 200px<br /><applet load="1k9u" size="450" color="white" frame="true" align="right" spinBox="true" caption="1k9u, resolution 1.75Å" /> '''Crystal Structure of...)
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Revision as of 16:51, 20 November 2007
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Crystal Structure of the Calcium-Binding Pollen Allergen Phl p 7 (Polcalcin) at 1.75 Angstroem
Overview
The timothy grass pollen allergen Phl p 7 assembles most of the IgE, epitopes of a novel family of 2 EF-hand calcium-binding proteins and, therefore represents a diagnostic marker allergen and vaccine candidate, for immunotherapy. Here we report the first three-dimensional structure of, a representative of the 2 EF-hand allergen family, Phl p 7, in the, calcium-bound form. The protein occurs as a novel dimer assembly with, unique features: in contrast to well known EF-hand proteins such as, calmodulin, parvalbumin or the S100 proteins, Phl p 7 adopts an extended, conformation. Two protein monomers assemble in a head-to-tail arrangement, with domain-swapped EF-hand pairing. The intertwined dimer adopts a, barrel-like structure with an extended hydrophobic cavity providing a, ligand-binding site. Calcium binding acts as a conformational switch, between an open and a closed dimeric form of Phl p 7. These findings are, interesting in the context of lipid- and calcium-dependent pollen tube, growth. Furthermore, the structure of Phl p 7 allows for the rational, development of vaccine strategies for treatment of sensitized allergic, patients.
About this Structure
1K9U is a Single protein structure of sequence from Phleum pratense with SO4 and CA as ligands. Full crystallographic information is available from OCA.
Reference
The cross-reactive calcium-binding pollen allergen, Phl p 7, reveals a novel dimer assembly., Verdino P, Westritschnig K, Valenta R, Keller W, EMBO J. 2002 Oct 1;21(19):5007-16. PMID:12356717
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