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. 2013 Apr 25;8(4):e61913. doi: 10.1371/journal.pone.0061913

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© 2013 Zorn et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Nano-ESI-LTQ-Orbitrap-MS data. The signal of the selenopeptide from FdoG at m/z 993.4281 matches the expected mass with a deviation of 1.1 ppm. In the inset the signal is shown enlarged, exhibiting the characteristic isotope pattern of a selenopeptide. (B, C) Nano-ESI-LTQ-Orbitrap-MS/MS data of peptides LPSTu₆₁₈FAEENGSIVNSGR (B, m/z 993.4281) and LPSTa₆₁₈FAEENGSIVNSGR (C, m/z 923.9503). Precursor ions were selected, fragmented, and analyzed in the linear ion trap (LTQ). MS/MS data unambiguously identify carbamidomethylated selenocysteine (u) and dehydroalanine (a) at position 618.