Biomedical Engineering Reference
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Fig. 5.2. CID and ETD tandem mass spectra of the singly phosphorylated triply protonated peptide
TLYEHYSGGESHNSpSSSK. (
i
)CID-lossofH
3
PO
4
from the peptide is indicated as
.(
ii
) ETD - the phosphate is main-
tained on the fragment ion during dissociation. N-terminal ions (c and b ions) and C-terminal ions (z and y ions) are
indicated.
CID “tickling,” dissociates the hydrogen-bonded, dissociated,
charge-reduced species, significantly improving the sequence cov-
erage by production of c
+
and z
+
•
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