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. 2020 May 4;10:7426. doi: 10.1038/s41598-020-64143-9

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Schematic illustration of isopeptides between TG2 and barley gluten proteins. (B2), (B3) and (B5), Isopeptides with localization probabilities >75%. (B1), (B4) and (B6)–(B10), Isopeptides with crosslinking sites additionally confirmed by parallel reaction monitoring. The binding glutamine residues are given in bold, the binding probabilities for the crosslinks (MaxQuant) in the grey box and the deamidation probabilities for the glutamine residues in colours. Specific fragments used to confirm the binding sites are given in blue (b-fragments) and pink (y-fragments).