- P-ISSN 2233-4203
- E-ISSN 2093-8950
In the present study, we report that the charge-directed (assisted) peptide dissociation products, such as b- and y-type peptidebackbone fragments, were the major products in MS/MS and MS3 applications of some o-TEMPO-Bz-C(O)-peptide ions, whileradical-driven dissociation products, such as a/x and c/z-type fragments, were previously shown to be the major products in the freeradical initiated peptide sequencing mass spectrometry (FRIPS MS). Those o-TEMPO-Bz-C(O)-peptides share a common feature intheir sequences, that is, the peptides do not include an arginine residue that has the highest proton affinity among free amino acids. The appearance of b- and y-type fragments as major products in FRIPS MS can be understood in terms of the so-called “mobile-protonmodel”. When the proton is highly mobilized by the absence of arginine, the chare-directed peptide dissociation pathways appearto be more competitive than the radical-driven dissociation pathways, in our FRIPS experiments.
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