Title
Purification and Characterization of Naturally Occurring Post-Translationally Cleaved Ara h 6 an Allergen That Contributes Substantially to the Allergenic Potency of Peanut
Author
de Jong, G.A.H.
Jayasena, S.
Johnson, P.
Marsh, J.
Apostolovic, D.
van Hage, M.
Nordlee, J.
Baumert, J.
Taylor, S.L.
Roucairol, C.
de Jongh, H.
Koppelman, S.J.
Publication year
2018
Abstract
The 2S albumin Ara h 6 is one of the most important peanut allergens. A post-translationally cleaved Ara h 6 (pAra h 6) was purified from Virginia type peanuts, and the cleavage site was mapped using high-resolution mass spectrometry. Compared to intact Ara h 6, pAra h 6 lacks a 5-amino acid stretch, resembling amino acids 43-47 (UniProt accession number Q647G9) in the nonstructured loop. Consequently, pAra h 6 consists of two chains: an N-terminal chain of approximately 5 kDa and a C-terminal chain of approximately 9 kDa, held together by disulfide bonds. Intermediate post-translationally cleaved products, in which this stretch is cleaved yet still attached to one of the subunits, are also present. The secondary structure and immunoglobulin E (IgE) binding of pAra h 6 resembles that of intact Ara h 6, indicating that the loss of the nonstructured loop is not critical for maintaining the protein structure. Commercially available monoclonal and polyclonal immunoglobulin G (IgG) antibodies directed to Ara h 6 react with both intact Ara h 6 and pAra h 6, suggesting that the involved epitopes are not located in the area that is post-translationally cleaved. No differences between intact Ara h 6 and pAra h 6 in terms of IgE binding were found, suggesting that the area that is post-translationally cleaved is not involved in IgE epitopes either. For all main cultivars Runner, Virginia, Valencia, and Spanish, intact Ara h 6 and pAra h 6 occur in peanut at similar levels, indicating that pAra h 6 is a consistent and important contributor to the allergenic potency of peanut. © Copyright 2018 American Chemical Society.
Subject
Arachis hypogaea
IgE
Allergens
Antibodies
Chains
Covalent bonds
Epitopes
Mass spectrometry
Purification
Sulfur compounds
Arachis hypogaea
High resolution mass spectrometry
Immunoglobulin G
Naturally occurring
peanut
Peanut allergens
Protein structures
Secondary structures
Oilseeds
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DOI
https://doi.org/10.1021/acs.jafc.8b03140
TNO identifier
954959
ISSN
0021-8561
Source
Journal of Agricultural and Food Chemistry, 66 (66), 10855-10863
Document type
article