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

✍ Scribed by M. Kirk Green; Sharron G. Penn; Carlito B. Lebrilla

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
459 KB
Volume
6
Category
Article
ISSN
1044-0305

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✦ Synopsis

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.

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