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1pxz

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[[Image:1pxz.gif|left|200px]]
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{{STRUCTURE_1pxz| PDB=1pxz | SCENE= }}
{{STRUCTURE_1pxz| PDB=1pxz | SCENE= }}
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'''1.7 Angstrom Crystal Structure of jun a 1, the major allergen from cedar pollen'''
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===1.7 Angstrom Crystal Structure of jun a 1, the major allergen from cedar pollen===
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==Overview==
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Pollen from cedar and cypress trees is a major cause of seasonal hypersensitivity in humans in several regions of the Northern Hemisphere. We report the first crystal structure of a cedar allergen, Jun a 1, from the pollen of the mountain cedar Juniperus ashei (Cupressaceae). The core of the structure consists primarily of a parallel beta-helix, which is nearly identical to that found in the pectin/pectate lyases from several plant pathogenic microorganisms. Four IgE epitopes mapped to the surface of the protein are accessible to the solvent. The conserved vWiDH sequence is covered by the first 30 residues of the N terminus. The potential reactive arginine, analogous to the pectin/pectate lyase reaction site, is accessible to the solvent, but the substrate binding groove is blocked by a histidine-aspartate salt bridge, a glutamine, and an alpha-helix, all of which are unique to Jun a 1. These observations suggest that steric hindrance in Jun a 1 precludes enzyme activity. The overall results suggest that it is the structure of Jun a 1 that makes it a potent allergen.
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(as it appears on PubMed at http://www.pubmed.gov), where 15539389 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15539389}}
==About this Structure==
==About this Structure==
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[[Category: Cedar pollen]]
[[Category: Cedar pollen]]
[[Category: Parallel beta-helix]]
[[Category: Parallel beta-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:37:35 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 03:16:17 2008''

Revision as of 00:16, 29 July 2008

Image:1pxz.png

Template:STRUCTURE 1pxz

1.7 Angstrom Crystal Structure of jun a 1, the major allergen from cedar pollen

Template:ABSTRACT PUBMED 15539389

About this Structure

1PXZ is a Single protein structure of sequence from Juniperus ashei. Full crystallographic information is available from OCA.

Reference

Crystal structure of Jun a 1, the major cedar pollen allergen from Juniperus ashei, reveals a parallel beta-helical core., Czerwinski EW, Midoro-Horiuti T, White MA, Brooks EG, Goldblum RM, J Biol Chem. 2005 Feb 4;280(5):3740-6. Epub 2004 Nov 10. PMID:15539389

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