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Recent studies have demonstrated that interactions between cysteic acid and arginine residues have a marked effect on the low energy decompositions of protonated peptides in the gas phase. This work extends these findings to show that analogous interactions operate in the presence of other acidic amino acid residues, although the effects are less pronounced. Thus, the presence of aspartic or glutamic...
Low energy fragmentations of protonated peptides in the gas phase are generally attributed to charge-directed processes. The extent and location of peptide backbone fragmentation is accordingly influenced by the extent to which charge is sequestered on amino acid side-chains. We describe systematic studies of the efficiencies of decomposition of peptide ions to assess in particular the influence...
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