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Table 3 A subset of tryptic peptides from glyceraldehyde-3-phosphate dehydrogenase C subunit (At3g04120) that were identified by mass spectrometry and subsequent database search (14N-search, see methods for details). For each peptide the expected mass difference was calculated based on the measured mass to charge ratio (MCR). Asterisks mark those peptides that have also been identified in the database search with 15N as fixed modification (15N-search, see Methods for details)

From: Metabolic labeling of plant cell cultures with K15NO3 as a tool for quantitative analysis of proteins and metabolites

Sequence measured mass 14N MCR 14N [Th] Charge calculated mass difference calculated mass 15N MCR 15N [Th]
AASFNIIPSSTGAAK 1434.42 718.22 2 16.95 1451.37 726.69
DAPMFVVGVNEHEYK 1733.42 867.72 2 18.94 1752.36 877.18
FGIVEGLMTTVHSITATQK * 2033.69 1017.85 2 18.94 2052.63 1027.32
GILGYTEDDVVSTDFVGDNR 2170.55 1086.28 2 23.93 2194.48 1098.24
LVSWYDNEWGYSSR 1760.47 881.24 2 19.94 1780.41 891.20
SDLDIVSNASCTTNCLAPLAK 2248.71 1125.36 2 23.93 2272.64 1137.32
VPTVDVSVVDLTVR * 1497.55 749.78 2 16.95 1514.50 758.25
YDSVHGQWK 1118.39 560.20 2 13.96 1132.35 567.17