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. Author manuscript; available in PMC: 2021 Aug 7.
Published in final edited form as: J Proteome Res. 2020 May 29;19(8):3315–3325. doi: 10.1021/acs.jproteome.0c00226

Figure 4.

Figure 4.

CZE-MS/MS data of the E. coli sample regarding PTMs. (A) Distribution of some modifications on the identified proteoforms. (B) Sequence and fragmentation pattern of the 50S ribosomal protein L7/L12 proteoform with one methylation at the marked lysine residue and N-terminal truncation. (C) Sequence and fragmentation pattern of the 50S ribosomal protein L7/L12 proteoform with only N-terminal truncation. (D) Mass spectrum of one charge state (+6) of the 50S ribosomal protein L7/L12 proteoforms in (B) and (C). (E) Sequence and fragmentation pattern of one proteoform of the aspartate carbamoyltransferase regulatory chain with one disulfide bond between the two marked cysteine residues and truncations at the termini. (F) Sequence and fragmentation pattern of one proteoform of 50S ribosomal protein L31 with two disulfide bonds among the four marked cysteine residues, removal of two amino acid residues at the N-terminus, and truncation at the C-terminus.