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

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

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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: https://doi.org/10.1074/jbc.M409655200
  • Primary Citation of Related Structures:  

  • 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.

  • 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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Major pollen allergen Jun a 1
A, B
346Juniperus asheiMutation(s): 0 
Find proteins for P81294 (Juniperus ashei)
Explore P81294 
Go to UniProtKB:  P81294
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP81294
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.636α = 90
b = 115.005β = 95.82
c = 73.525γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
RESOLVEmodel building
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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