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. 2012 Sep 13;7(9):e44797. doi: 10.1371/journal.pone.0044797

Figure 4. MS/MS spectra for a tryptophan-containing peptide from S. aureus cell lysate.

Figure 4

S. aureus was grown in the presence of L-tryptophan (A) or 1-L-MT (B). From the spectra shown, the peptide SVVIAYEPIWAIGTGK from S. aureus Triosephosphate isomerase (Uniprot ID: A7WZS8) was identified with a mascot score of 63 (L-tryptophan) and 47 (1-L-MT). The peptide contains L-Tryptophan and not 1-L-MT in both samples. Fragment ions identifying the tryptophan residue are clearly visible and are marked with an asterisk.