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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: J Proteome Res. 2011 Mar 1;10(4):1728–1736. doi: 10.1021/pr1010247

Figure 3.

Figure 3

Representative tandem mass spectra generated by CID of phosphophoryaltion states of statherin peptides. (A) Spectrum identified as DsSEEKFLR, where Ser-21 is phosphorylated. (B) Spectrum identified as DSsEEKFLR, where Ser-22 is phosphorylated. (C) Spectrum identified as MIGADssEEKFLR, where Ser-21 and Ser-22 are phosphorylated. (D) Spectrum of a synthesized form of MIGADssEEKFLR for comparison, where Ser-21 and Ser-22 are phosphorylated. Also displayed is the full amino acid sequence of the statherin gene product with signal peptide and mature sequences marked. Residues in bold were identified by the spectra from the figure and residues in lower case are identified phosphorylation sites. The complete primary amino acid sequence of statherin including that of the signal peptide and mature protein is displayed at the top.