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. Author manuscript; available in PMC: 2010 Feb 1.
Published in final edited form as: J Proteome Res. 2009 Feb;8(2):493–501. doi: 10.1021/pr8007072

Table 1.

Protonated O-linked glycopeptide ions subjected to IRMPD. Asterisks appear after glycosylated residues

m/z Peptide Glycan Peptide Cleavages Seq. Cov.
1114.45 GPT*PS HeX1 HexNAc1 NeuAc1 b3 25%
1253.49 ST*V HeX1 HexNAc1 NeuAc2 b2 50%
1312.55 APS*AVPD HeX1 HexNAc1 NeuAc1 y6, b3, b5 50%
1324.54 ST*VA HeX1 HexNAc1 NeuAc2 y2, b3 66%
1352.53 PT*ST HeX1 HexNAc1 NeuAc2 y3, b2, b3 100%
1425.57 ST*VAT HeX1 HexNAc1 NeuAc2 Y4, b3, b4 75%
1445.59 GEPT*STPT HeX1 HexNAc1 NeuAc1 y6, b4, b5, b6 57%
1453.56 EST*VA HeX1 HexNAc1 NeuAc2 y4 25%
1603.65 APS*AVPD HeX1 HexNAc1 NeuAc2 y6, b3, b5 50%
1736.67 GEPT*STPT HeX1 HexNAc1 NeuAc2 y6, b4, b5, b6 57%
1841.72 GPT*PSA Hex2 HexNAc2 NeuAc2 b3, y3 20%
2101.82 GEPT*ST*PT (HeX1 HexNAc1 NeuAc)2 y6, b4, b5, b6 57%