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Title: Radiation chemical studies of Gly-Met-Gly in aqueous solution

Journal Article · · Free Radical Research
 [1];  [1];  [2];  [2];  [2];  [3];  [4]
  1. Consiglio Nazionale delle Ricerche (CNR), Bologna (Italy)
  2. Univ. of Groningen (The Netherlands)
  3. Univ. of Notre Dame, IN (United States)
  4. Consiglio Nazionale delle Ricerche (CNR), Bologna (Italy); NCSR Demokritos, Athens (Greece)

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.

Research Organization:
University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FC02-04ER15533
OSTI ID:
1438192
Journal Information:
Free Radical Research, Vol. 50, Issue sup1; ISSN 1071-5762
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Identification and characterization of protein cross-links induced by oxidative reactions journal August 2018
Chlorination and oxidation of the extracellular matrix protein laminin and basement membrane extracts by hypochlorous acid and myeloperoxidase journal November 2018

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