The study of radical stress in the biological environment needs a comprehensive vision of all possible reactive species and their mechanisms. Among them, reductive stress is evaluated for its selective target of sulfur-containing compounds. The selective attack of reducing species like
H• atoms or eaq
−/H+ to sulfur-containing amino acid residues has been proved in different substrates, peptides and proteins. The transformations include methionine to α-aminobutyric acid and cysteine/cystine residues to alanine,
as recognized in several sequences so far, such as RNase A, lysozyme, Met-enkephalin, amyloid β-peptide and metallothioneins. The amino acid desulfurization is accompanied by the formation of low-molecular-weight sulfur-centered radicals that may cause geometrical cis–trans
isomerization of unsaturated fatty acid residues in lipid bilayer. Thus, tandem protein/lipid damage is accomplished. Progress in research has given us a more comprehensive overview of the protein modifications and their roles, and the chemical biology approach will make its vital contribution
to the study of free radical reactions, linking chemistry to biology and medicine.
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Document Type: Research Article
Publication date: 01 September 2008
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International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions
CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.
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