Crystal structure of timothy grass allergen Phl p 12.0101 reveals an unusual profilin dimer

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 

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Crystal structure of timothy grass allergen Phl p 12.0101 reveals an unusual profilin dimer.

O'Malley, A.Kapingidza, A.B.Hyduke, N.Dolamore, C.Kowal, K.Chruszcz, M.

(2021) Acta Biochim Pol 68: 15-22

  • DOI: https://doi.org/10.18388/abp.2020_5587
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Timothy grass pollen is a source of potent allergens. Among them, Phl p 1 and Phl p 5 are thought to be the most important, as a majority of timothy grass-allergic individuals have IgE antibodies directed against these two allergens. The profilin from timothy grass (Phl p 12) has been registered as a minor allergen, with up to 35% of individuals in populations of grass pollen allergic patients showing IgE binding to Phl p 12. Profilins are primarily minor allergens and are known for a high likelihood of co-sensitization as well as cross-reactivity situations caused by their sequence and structure similarity. The crystal structure of Phl p 12.0101 was determined and it revealed that this allergen may form an unusual dimer not previously observed among any profilins. For example, the Phl p 12 dimer has a completely different geometry and interface when compared with the latex profilin (Hev b 8) dimer that has its crystal structure determined. The structure of Phl p 12.0101 is described in the context of allergenic sensitization and allergy diagnostics. Moreover, the structure of the Phl p 12.0101 dimer is discussed, taking into account the production of recombinant allergens and their storage.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Profilin-1131Phleum pratenseMutation(s): 0 
Gene Names: PRO1PHLPXI
Find proteins for P35079 (Phleum pratense)
Explore P35079 
Go to UniProtKB:  P35079
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35079
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CIT

Download Ideal Coordinates CCD File 
C6 H8 O7
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.344α = 90
b = 56.344β = 90
c = 94.379γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States2R01AI077653-10A1

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-31
    Type: Initial release
  • Version 1.1: 2023-10-18
    Changes: Data collection, Database references, Refinement description