Qualitative LC-MS/MS Identification, Formation and Stability of Adducts and Crosslinks Arising from the Reactions of Glutathione with the Model Enal Systems

Title:Qualitative LC-MS/MS Identification, Formation and Stability of Adducts and Crosslinks Arising from the Reactions of Glutathione with the Model Enal Systems

Volume: 25 Issue: 15

Author(s): Kinga Salus and Donata Pluskota-Karwatka*

Affiliation:

• Faculty of Chemistry, Adam Mickiewicz University in Poznan, Uniwersytetu Poznanskiego 8, 61-614 Poznan,Poland

Keywords: Glutathione, S-conjugates, N-conjugates, cross-links, adducts, Michael addition.

Abstract: Glutathione (GSH), due to the ability to capture the reactive electrophiles of exoand endogenous origins, is expected to prevent cross-linking induced by these compounds. However, it may instead become cross-linked itself. We subjected glutathione to reactions with model α,β-unsaturated carbonyl systems resulting from the interactions of adenosine with bifunctional aldehyde products of lipid peroxidation, and identified a range of adducts and cross-linked products. We found that the S-conjugated adducts, initially formed in the typical GSH Michael addition to α,β-unsaturated carbonyl system, unexpectedly undergo gradual degradation giving rise to the final N-conjugated products, in which formation of peptide amino group is involved instead of sulfhydryl functionality. This finding shows that the role of the GSH amino group in the non-enzymatic detoxification is underestimated, and that reactions between cellular α,β-unsaturated carbonyl compounds and GSH may be more complex than are presently perceived.

Cite this article as:

Salus Kinga and Pluskota-Karwatka Donata*, Qualitative LC-MS/MS Identification, Formation and Stability of Adducts and Crosslinks Arising from the Reactions of Glutathione with the Model Enal Systems, Current Organic Chemistry 2021; 25 (15) . https://dx.doi.org/10.2174/1385272825666210614092833