ArticleJournal of the American Society for Mass Spectrometry2009
Kinetics for tautomerizations and dissociations of triglycine radical cations.
Article in Journal of the American Society for Mass Spectrometry, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Free Radical-Initiated Peptide Sequencing Mass Spectrometry for Phosphopeptide Post-translational Modification Analysis.Journal of the American Society for Mass Spectrometry · 2019Article
- Fragmentation chemistry of [Met-Gly]•+, [Gly-Met]•+, and [Met-Met]•+ radical cations.Journal of the American Society for Mass Spectrometry · 2013Article
- Structure and reactivity of the N-acetyl-cysteine radical cation and anion: does radical migration occur?Journal of the American Society for Mass Spectrometry · 2011Article
- Mobile protons versus mobile radicals: gas-phase unimolecular chemistry of radical cations of cysteine-containing peptides.Journal of the American Society for Mass Spectrometry · 2010Article
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Authors and funding
6 authors.
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Abstract
Fragmentations of tautomers of the alpha-centered radical triglycine radical cation, [GGG(*)](+), [GG(*)G](+), and [G(*)GG](+), are charge-driven, giving b-type ions; these are processes that are facilitated by a mobile proton, as in the fragmentation of protonated triglycine (Rodriquez, C. F. et al. J. Am. Chem. Soc. 2001, 123, 3006-3012). By contrast, radical centers are less mobile. Two mechanisms have been examined theoretically utilizing density functional theory and Rice-Ramsperger-Kassel-Marcus modeling: (1) a direct hydrogen-atom migration between two alpha-carbons, and (2) a two-step proton migration involving canonical [GGG](*+) as an intermediate. Predictions employing the latter mechanism are in good agreement with results of recent CID experiments (Chu, I. K. et al. J. Am. Chem. Soc. 2008, 130, 7862-7872).
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