1PXZ

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

Summary for 1PXZ

• Entry DOI: 10.2210/pdb1pxz/pdb
• Descriptor: Major pollen allergen Jun a 1 (2 entities in total)
• Functional Keywords: parallel beta-helix, allergen, cedar pollen
• Biological source: Juniperus ashei (Ozark white cedar)
• Total number of polymer chains: 2
• Total formula weight: 75361.73

Authors

Czerwinski, E.W.,White, M.A.,Midoro-Horiuti, T.,Brooks, E.G.,Goldblum, R.M. (deposition date: 2003-07-07, release date: 2004-11-16, Last modification date: 2024-10-16)

Primary citation

Czerwinski, E.W.,Midoro-Horiuti, T.,White, M.A.,Brooks, E.G.,Goldblum, R.M.
Crystal structure of Jun a 1, the major cedar pollen allergen from Juniperus ashei, reveals a parallel beta-helical core.
J.Biol.Chem., 280:3740-3746, 2005

PubMed Abstract: 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.

PubMed: 15539389
DOI: 10.1074/jbc.M409655200

Experimental method

X-RAY DIFFRACTION (1.7 Å)