1PXZ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of Jun a 1, the major cedar pollen allergen from Juniperus ashei, reveals a parallel beta-helical core.

Czerwinski, E.W.Midoro-Horiuti, T.White, M.A.Brooks, E.G.Goldblum, R.M.

(2005) J.Biol.Chem. 280: 3740-3746

  • DOI: 10.1074/jbc.M409655200

  • 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 Junip ...

    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.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction analysis of Jun a 1, the major allergen isolated from pollen of the mountain cedar Juniperus ashei
      Liu, D.,Midoro-Horiuti, T.,White, M.A.,Brooks, E.G.,Goldblum, R.M.,Czerwinski, E.W.
      (2003) Acta Crystallogr.,Sect.D 59: 1052


    Organizational Affiliation

    Sealy Center for Structural Biology, Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch at Galveston, Galveston, Texas 77555-0647, USA. edcz@xray.utmb.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Major pollen allergen Jun a 1
A, B
346Juniperus asheiEC: 4.2.2.2
Find proteins for P81294 (Juniperus ashei)
Go to UniProtKB:  P81294
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 53.636α = 90.00
b = 115.005β = 95.82
c = 73.525γ = 90.00
Software Package:
Software NamePurpose
RESOLVEmodel building
DENZOdata reduction
SHELXL-97refinement
HKL-2000data reduction
SOLVEphasing
SCALEPACKdata scaling
RESOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-16
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description