The complexation of protonated peptides with saccharides in the gas phase decreases the rates of hydrogen/deuterium exchange reactions

M. Kirk Green, Sharron G. Penn, Carlito B Lebrilla

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Gas-phase noncovalently bound complexes are probed by hydrogen/deuterium exchange. The complexes, composed of a protonated amino acid and a monosaccharide, are investigated to observe the effects of complexation on the rates of exchange. Rate constants are determined and compared for complexed and uncomplexed amino acids. The overall rate constant, which corresponds to exchange of a specific number of hydrogens, is deconvoluted to yield site-specific rate constants. Complexation of amino acids with saccharides significantly decreases the rate constants of the exchange. Results of molecular orbital calculations are provided to explain the decrease in the rates.

Original languageEnglish (US)
Pages (from-to)1247-1251
Number of pages5
JournalJournal of the American Society for Mass Spectrometry
Volume6
Issue number12
DOIs
StatePublished - Dec 1995

ASJC Scopus subject areas

  • Spectroscopy
  • Structural Biology

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