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Protein Protocols Protein Protocols

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618 Bonenfant, Mini, and Jenö<br />

Fig. 4. Comparison of the MS/MS spectra of (A) the unphosphorylated and (B) the phosphorylated<br />

CP 4 peptide (comprising residues 23–48) from interphase lamin. In both experiments,<br />

the triply charged ion was selected for collision-induced dissociation. Phosphorylated fragment<br />

ions are indicated by an asterisk, ions that have undergone neutral loss of phosphoric acid are<br />

indicated by ∆. (C) Summary of the observed b- and y-ions in the MS/MS spectrum of CP 4. The<br />

predicted b-ions are listed above the sequence for unphosphorylated CP 4 (lower row) and for<br />

phospho- CP 4 (upper row) by assuming phosphorylation on the serine indicated with an asterisk<br />

(Ser 25 in the amino acid sequence of Drosophila lamin). The symbol ∆ marks those ions that<br />

have undergone neutral loss of phosphoric acid during the collision process. The amino<br />

sequence of CP 4 is shown only for residues 23–37, the C-terminal part is abbreviated as<br />

(11 res). (From ref. 17).

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