title: A curated gluten protein sequence database to support development of proteomics methods for determination of gluten in gluten-free foods.
abstract: The unique physiochemical properties of wheat gluten enable a diverse range of food products to be manufactured. However, gluten triggers coeliac disease, a condition which is treated using a gluten-free diet. Analytical methods are required to confirm if foods are gluten-free, but current immunoassay-based methods can unreliable and proteomic methods offer an alternative but require comprehensive and well annotated sequence databases which are lacking for gluten. A manually a curated database (GluPro V1.0) of gluten proteins, comprising 630 discrete unique full length protein sequences has been compiled. It is representative of the different types of gliadin and glutenin components found in gluten. An in silico comparison of their coeliac toxicity was undertaken by analysing the distribution of coeliac toxic motifs. This demonstrated that whilst the α-gliadin proteins contained more toxic motifs, these were distributed across all gluten protein sub-types. Comparison of annotations observed using a discovery proteomics dataset acquired using ion mobility MS/MS showed that more reliable identifications were obtained using the GluPro V1.0 database compared to the complete reviewed Viridiplantae database. This highlights the value of a curated sequence database specifically designed to support the proteomic workflows and the development of methods to detect and quantify gluten.
  
  
  
  We have constructed the first manually curated open-source wheat gluten protein sequence database (GluPro V1.0) in a FASTA format to support the application of proteomic methods for gluten protein detection and quantification. We have also analysed the manually verified sequences to give the first comprehensive overview of the distribution of sequences able to elicit a reaction in coeliac disease, the prevalent form of gluten intolerance. Provision of this database will improve the reliability of gluten protein identification by proteomic analysis, and aid the development of targeted mass spectrometry methods in line with Codex Alimentarius Commission requirements for foods designed to meet the needs of gluten intolerant individuals.
authors.affiliation: School of Biological Sciences, Manchester Institute of Biotechnology, Manchester Academic Health Sciences Centre, University of Manchester, M17DN, UK.
authors.forename: Sophie
authors.initials: S
authors.lastname: Bromilow
authors.affiliation: Waters Corporation, Stamford Avenue, Altrincham Road, Wilmslow SK9 4AX, UK.
authors.forename: Lee A
authors.initials: LA
authors.lastname: Gethings
authors.affiliation: School of Earth and Environmental Sciences, Manchester Institute of Biotechnology, University of Manchester, M17DN, UK.
authors.forename: Mike
authors.initials: M
authors.lastname: Buckley
authors.affiliation: Genon Laboratories Limited, Cragg Vale, Halifax, UK.
authors.forename: Mike
authors.initials: M
authors.lastname: Bromley
authors.affiliation: Rothamsted Research, Harpenden, UK.
authors.forename: Peter R
authors.initials: PR
authors.lastname: Shewry
authors.affiliation: Waters Corporation, Stamford Avenue, Altrincham Road, Wilmslow SK9 4AX, UK.
authors.forename: James I
authors.initials: JI
authors.lastname: Langridge
authors.affiliation: School of Biological Sciences, Manchester Institute of Biotechnology, Manchester Academic Health Sciences Centre, University of Manchester, M17DN, UK. Electronic address: clare.mills@manchester.ac.uk.
authors.forename: E N
authors.initials: EN
authors.lastname: Clare Mills
mesh_terms: D000595:Amino Acid Sequence; D002446:Celiac Disease / Q000209:etiology; D030562:Databases, Protein / Q000592:standards / Q000639:trends; D055050:Diet, Gluten-Free; D005903:Gliadin / Q000032:analysis; D005983:Glutens / Q000032:analysis*; D006801:Humans; D040901:Proteomics / Q000379:methods*
chemical_list: D005983:Glutens; D005903:Gliadin; C037302:glutenin
keywords: Celiac toxic motif; Database; Gluten; Proteomics; Triticum aestivum