Identification of a gliadin T-cell epitope in coeliac disease: general importance of gliadin deamidation for intestinal T-cell recognition.

Abstract:

:Coeliac disease probably results from a T-cell response to wheat gliadin and is associated to HLA-DQ2. No gliadin epitopes recognized by intestinal T cells have yet been identified, limiting our understanding of the pathogenesis. Gut-lesion-derived DQ2-restricted T cells from coeliac disease patients were used to identify an epitope within a purified gamma-type gliadin. The structure of the epitope was characterized by mass spectrometry and verified by synthesis. The epitope (QPQQSFPEQQ) results from deamidation of a distinct glutamine in the native structure. This deamidation is important for binding to DQ2 and T-cell recognition. Other gut-derived T cells fail to recognize the epitope, although deamidation of unfractionated gliadin enhances the response of all gut-derived DQ2-restricted T cells isolated from several patients. Several DQ2-restricted T-cell epitopes exist, but for all of them deamidation of glutamine residues appears to be critical for creation of active epitopes. Native gliadin has few negatively charged residues but is very rich in glutamine. After deamidation gliadin becomes a rich source of DQ2 epitopes thus providing a link between DQ2, gliadin and coeliac disease. The necessity for modification may have general immunological relevance.

journal_name

Scand J Immunol

authors

Sjöström H,Lundin KE,Molberg O,Körner R,McAdam SN,Anthonsen D,Quarsten H,Norén O,Roepstorff P,Thorsby E,Sollid LM

doi

10.1046/j.1365-3083.1998.00397.x

subject

Has Abstract

pub_date

1998-08-01 00:00:00

pages

111-5

issue

2

eissn

0300-9475

issn

1365-3083

journal_volume

48

pub_type

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