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. 2017 Jul 18;7:5765. doi: 10.1038/s41598-017-06202-2

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© The Author(s) 2017

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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MS/MS spectra of FN peptides showing both the deamidated variant (GNLLQCICTGN#GRGEW) and unmodified form (GNLLQCICTGNGRGEW) as annotated by Mascot database search software (a). The deamidation site was identified with high confidence as being located between sequences (y1, y2, y4, y6) and (y7–y14). Each of the fragmented y-ions containing a deamidation site (y7–y14) displayed a characteristic mass increase of 0.984 Da compared with the unmodified peptide^{45, 52}.