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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):631–642. doi: 10.1021/pr800758g

Figure 8.

Figure 8

(A) ETD spectrum of the precursor ion m/z 472.1 (3+), showing the non-modified peptide 574-587 of the full length APP695 containing four potential O-glycosylation sites. (B) CID and (C) ETD of the precursor ion m/z 690.8 (3+), corresponding to glycopeptide 574-587 of the full length APP695, showing amino acid Thr 576 occupied with the indicated Core 1 type trisaccharide. The ETD spectrum was obtained using data dependent acquisition and the activation energy was 0.10 V. Color code: yellow - N-acetyl galactosamine, blue - galactose, purple - sialic acid. The fragment ions relevant for determination of the glycosylation site are indicated with black boxes.