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Related Experiment Video

Updated: May 7, 2026

Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro

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Published on: June 28, 2024

Glutathione--hydroxyl radical interaction: a theoretical study on radical recognition process.

Béla Fiser¹, Balázs Jójárt, Imre G Csizmadia

¹Department of Chemical Informatics, Faculty of Education, University of Szeged, Szeged, Hungary.

|September 17, 2013

Summary

Glutathione (GSH) recognizes hydroxyl radicals (OH•) through a two-step process involving catching and steering. Terminal residues catch the radical, while glycine steers it for effective quenching.

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Area of Science:

Biochemistry
Computational Chemistry
Molecular Dynamics

Background:

Glutathione (GSH) is a crucial antioxidant protecting cells from oxidative stress.
Hydroxyl radicals (OH•) are highly reactive oxygen species that can damage cellular components.

Purpose of the Study:

To characterize the molecular interactions between glutathione and hydroxyl radicals.
To elucidate the mechanism of hydroxyl radical recognition and binding by glutathione.

Main Methods:

Non-reactive molecular dynamics simulations (2 × 1.2 μs).
Quantum chemical calculations on selected complexes and conformers.
Analysis of host-guest interactions and energy profiles.

Main Results:

Identified a two-step recognition process: catching and steering.
Over 78% of interactions involve complex formation via anionic carboxyl groups (catching).
Glycine residue plays a key role in steering the hydroxyl radical through flexible interactions.

Conclusions:

Glutathione utilizes both terminal residues and the glycine residue for effective hydroxyl radical recognition.
The identified complexes serve as initial configurations for radical quenching via hydrogen atom migration.