Crystal Structure of a Hypoallergenic Isoform of the Major Birch Pollen Allergen Bet v 1 and its Likely Biological Function as a Plant Steroid CarrierMarkovic-Housley, Z., Degano, M., Lamba, D., von Roepenack-Lahaye, E., Clemens, S., Susani, M., Ferreira, F., Scheiner, O., Breiteneder, H.
(2003) J.Mol.Biol. 325: 123-133
- PubMed: 12473456
- Also Cited By: 1XDF, 2QIM, 3E85
- PubMed Abstract:
- Isoforms of Bet v 1, the major birch pollen allergen, analyzed by liquid chromatography, mass spectrometry, and cDNA cloning.
Swoboda, I.,Jilek, A.,Ferreira, F.,Engel, E.,Hoffman-Sommergruber, K.,Scheiner, O.,Kraft, D.,Breiteneder, H.,Pittenauer, E.,Schmid, E.,Vicente, O.,Heberle-Bors, E.,Ahorn, H.,Breitenbach, M.
(1995) J.Biol.Chem. 270: 2607
- The gene coding for the major birch pollen allergen Betv1, is highly homologous to a pea disease resistance response gene.
Breiteneder, H.,Pettenburger, K.,Bito, A.,Valenta, R.,Kraft, D.,Rumpold, H.,Scheiner, O.,Breitenbach, M.
(1989) Embo J. 8: 1935
Bet v 1l is a naturally occurring hypoallergenic isoform of the major birch pollen allergen Bet v 1. The Bet v 1 protein belongs to the ubiquitous family of pathogenesis-related plant proteins (PR-10), which are produced in defense-response to variou ...
Bet v 1l is a naturally occurring hypoallergenic isoform of the major birch pollen allergen Bet v 1. The Bet v 1 protein belongs to the ubiquitous family of pathogenesis-related plant proteins (PR-10), which are produced in defense-response to various pathogens. Although the allergenic properties of PR-10 proteins have been extensively studied, their biological function in plants is not known. The crystal structure of Bet v 1l in complex with deoxycholate has been determined to a resolution of 1.9A using the method of molecular replacement. The structure reveals a large hydrophobic Y-shaped cavity that spans the protein and is partly occupied by two deoxycholate molecules which are bound in tandem and only partially exposed to solvent. This finding indicates that the hydrophobic cavity may have a role in facilitating the transfer of apolar ligands. The structural similarity of deoxycholate and brassinosteroids (BRs) ubiquitous plant steroid hormones, prompted the mass spectrometry (MS) study in order to examine whether BRs can bind to Bet v 1l. The MS analysis of a mixture of Bet v 1l and BRs revealed a specific non-covalent interaction of Bet v 1l with brassinolide and 24-epicastasterone. Together, our findings are consistent with a general plant-steroid carrier function for Bet v 1 and related PR-10 proteins. The role of BRs transport in PR-10 proteins may be of crucial importance in the plant defense response to pathological situations as well as in growth and development.
Department of Structural Biology, Biozentrum, University of Basel, CH-4056 Basel, Switzerland. email@example.com