5WPW

Crystal structure of coconut allergen cocosin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 

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Literature

Crystal Structure of Cocosin, A Potential Food Allergen from Coconut (Cocos nucifera)

Jin, T.Wang, C.Zhang, C.Wang, Y.Chen, Y.W.Guo, F.Howard, A.Cao, M.J.Fu, T.J.McHugh, T.H.Zhang, Y.

(2017) J Agric Food Chem 65: 7560-7568

  • DOI: 10.1021/acs.jafc.7b02252
  • Primary Citation of Related Structures:  
    5WPW

  • PubMed Abstract: 
  • Coconut (Cocos nucifera) is an important palm tree. Coconut fruit is widely consumed. The most abundant storage protein in coconut fruit is cocosin (a likely food allergen), which belongs to the 11S globulin family. Cocosin was crystallized near a century ago, but its structure remains unknown ...

    Coconut (Cocos nucifera) is an important palm tree. Coconut fruit is widely consumed. The most abundant storage protein in coconut fruit is cocosin (a likely food allergen), which belongs to the 11S globulin family. Cocosin was crystallized near a century ago, but its structure remains unknown. By optimizing crystallization conditions and cryoprotectant solutions, we were able to obtain cocosin crystals that diffracted to 1.85 Å. The cocosin gene was cloned from genomic DNA isolated from dry coconut tissue. The protein sequence deduced from the predicted cocosin coding sequence was used to guide model building and structure refinement. The structure of cocosin was determined for the first time, and it revealed a typical 11S globulin feature of a double layer doughnut-shaped hexamer.


    Organizational Affiliation

    Healthy Processed Foods Research Unit, USDA-ARS, Western Regional Research Center , 800 Buchanan Street, Albany, California 94710, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
11S globulin isoform 1A, B424Cocos nuciferaMutation(s): 2 
Gene Names: COS-1
UniProt
Find proteins for A0A222NNM9 (Cocos nucifera)
Explore A0A222NNM9 
Go to UniProtKB:  A0A222NNM9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.41α = 90
b = 92.41β = 90
c = 212.85γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2016-11-21 
  • Released Date: 2017-10-25 
  • Deposition Author(s): Jin, T., Zhang, Y.

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-25
    Type: Initial release