Skip to main content
. Author manuscript; available in PMC: 2017 Aug 5.
Published in final edited form as: J Proteome Res. 2016 Jul 1;15(8):2422–2432. doi: 10.1021/acs.jproteome.5b01098

Table 2.

Four PTMs are treated as common PTMs in proteoform characterization

PTM Modified amino acids at the N-terminus Modified amino acids Monoisotopic mass mass (Da)
Acetylation All 20 amino acids K 42.01
Methylation All 20 amino acids HKNQRILDEST 14.01
Oxidation DKNPYRC* DKNPYRC* 15.99
Phosphorylation STY STY 79.96
*

Artifacts introduced in sample preparations and mass spectrometry experiments are not included.