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Radiation chemical studies of Gly-Met-Gly in aqueous solution [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages S24-S39 : digital, PDF file
Additional Creators:
United States. Department of Energy. Office of Science and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Important biological consequences are related to the reaction of HO radicals with methionine (Met). Several fundamental aspects remain to be defined when Met is an amino acid residue incorporated in the interior of peptides and proteins. The present study focuses on Gly-Met-Gly, the simplest peptide where Met is not a terminal residue. The reactions of HO with Gly-Met-Gly and its N-acetyl derivative were studied by pulse radiolysis technique. The transient absorption spectra were resolved into contributions from specific components of radical intermediates. Moreover, a detailed product analysis is provided for the first time for Met-containing peptides in radiolytic studies to support the mechanistic proposal. By parallel radiolytical and electrochemical reactions and consequent product identification, the formation of sulfoxide attributed to the direct HO radical attack on the sulfide functionality of the Met residue could be excluded, with the in situ generated hydrogen peroxide responsible for this oxidation. LC–MS and high resolution MS/MS were powerful analytical tools to envisage the structures of five products, thus allowing to complete the mechanistic picture of the overall Met-containing peptide reactivity.
Report Numbers:
E 1.99:1438192
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Note:
Published through SciTech Connect.
10/25/2016.
Free Radical Research 50 sup1 ISSN 1071-5762 AM
Sebastian Barata-Vallejo; Carla Ferreri; Tao Zhang; Hjalmar Permentier; Rainer Bischoff; Krzysztof Bobrowski; Chryssostomos Chatgilialoglu.
Univ. of Notre Dame, IN (United States)
Funding Information:
FC02-04ER15533
View MARC record | catkey: 24045623