NDLI: Mass spectrometric evidence for mechanisms of fragmentation of charge-derivatized peptides

Content Provider	Springer Nature Link
Author	Sadagopan, Nalini Watson, J. Throck
Copyright Year	2001
Abstract	Mass spectrometry of charged derivatives of peptides has been a growing area of interest in the past decade. Fragmentation of charged derivatives of peptides is believed to be different from than that of protonated peptides when analyzed by collisionally activated dissociation-tandem mass spectrometry (CAD-MS/MS). The charged derivatives fragment by charge-remote fragmentation mechanisms, which are usually classified as high-energy (HE)-CAD processes. Our objective in the present study is to investigate the mechanism of fragmentation of charged derivatives of peptides when analyzed by matrix-assisted laser desorption/ionization-post-source decay-mass spectrometry (MALDI-PSD-MS) and electrospray ionization (ESI)-CAD-MS/MS (ion trap), which involve low-energy processes. Three major types of hydrogens (α, β, and amide) are available for migration during the formation of the a $_{n}$ ions (the predominant ion series produced from these charged derivatives). To pinpoint which of the three hydrogens is involved in the formation of the a $_{n}$ ions, deuterium-labeled peptide derivatives with labels at specific sites were synthesized and analyzed by MALDI-PSD-MS and ESI-CAD-MS/MS. Our results suggest that the amide hydrogen of the residue at which the cleavage occurs shifts during the formation of a $_{n}$; this observation serves as evidence for the mechanism proposed earlier by Liao et al. for fragmentation of such charged derivatives. The results also help elucidate the structure of the a $_{n}$ ions, *b $_{n}$ ions, and others formed during cleavage at the proline residue, as well as the ions formed during loss of the C-terminal residue from these charged derivatives.
Starting Page	399
Ending Page	409
Page Count	11
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	12
Issue Number	4
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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