Figure 3

Quantitative representation of peptides (A) and proteins (B) containing oxidised Met residues identified by mass spectrometry. The total numbers of peptides and proteins containing at least one oxidised Met residue identified by LC-MS/MS in protein samples extracted from A. thaliana cells treated with 10 μM 8-Br-cGMP and collected at 0, 30 and 60 min post-treatment were analysed. Proteins matching the peptides were identified by searching against TAIR10 database using MASCOT and TPP algorithm, and only proteins within a 95% confidence threshold were considered. The total number of peptides (A) or proteins (B) are indicated outside the Venn diagram (in bold), the numbers inside are the unique peptides or proteins identified at each time point. Fourteen, 113 and 288 peptide fragments containing at least one oxidised Met appear only at either 0, 30 or 60 min. This corresponds to an increase in the total number of time point specific Met oxidised proteins from 10 to 94 and then to 224 (B).