List of oxidative modifications identified from multiple proteases.

aLowercase letters represent the amino acid residues that have oxidative modifications.bPositions of modified residues in the entire ubiquitin sequence are shown and are abbreviated as follows: Oxidation indicates an oxygen addition to the amino acid residue, Dioxidation indicated two oxygens addition to the amino acid residue, carbonylation indicates formaton of carbonyl group with a mass increase of 14 Da, GluSA indicates the carbonylation of arginine to glutamic semialdehyde, AminoAdSA indicates the carbonlyation of lysine to aminoadipic semialdehyde, Oxd'n indicates the carbonlyation of threonine to 2-amino-3-oxo-butanoic acid, Asp indicates the oxidation of histidine to aspartic acid, Deamidation indicates the conversion of -NH2 to -OH and Decarbonylation indicates the loss of carboxyl group.cMS/MS spectra of each peptide is provided in S1 Fig.List of oxidative modifications identified from multiple proteases.