Protein Oxidation Mechanisms in Biological Systems

Protein oxidation encompasses a variety of covalent modifications induced by reactive species targeting amino acid side chains and backbone structures. Reactive oxygen species such as hydroxyl radicals, hydrogen peroxide and superoxide drive both radical and non-radical pathways, yielding methionine sulfoxide, disulphide bonds, dityrosine cross-links and carbonyl derivatives on lysine, arginine and proline residues. Transition metal-catalysed reactions further intensify these processes, generating site-specific damage through Fenton-type chemistry. In contrast, regulated redox modifications of cysteine thiols serve as reversible molecular switches that modulate protein conformation, activity and interaction networks.

The interplay between damaging and signalling oxidation is governed by antioxidant systems including glutathione, thioredoxin and peroxiredoxin families, which reverse reversible modifications and limit irreversible carbonylation. Spatial organisation within crowded intracellular environments, membraneless organelles and lipid–protein interfaces shapes local redox landscapes, influencing reaction kinetics and product specificity. Dysregulation of these mechanisms underpins ageing, inflammatory disorders and neurodegeneration, while controlled exploitation of protein oxidation holds promise for novel biotechnological applications, food processing and therapeutic development.

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Protein Oxidation Mechanisms in Biological Systems publication trend

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Technical terms

Reactive oxygen species (ROS): Chemically reactive oxygen-derived molecules capable of initiating protein oxidation.

Carbonylation: Introduction of carbonyl groups into protein side chains, typically marking irreversible oxidative damage.

Disulphide bond: Covalent linkage between two cysteine residues, serving both regulatory and damage-related roles.

Dityrosine: Covalent cross-link between tyrosine residues formed by radical-mediated coupling, indicative of oxidative stress.

Metal-catalysed oxidation (MCO): Oxidative process involving transition metals that promotes site-specific protein damage via Fenton-type reactions.

Redox signalling: Reversible oxidative modifications acting as molecular switches in cellular communication and enzyme regulation.

References

1. Effect of crowding, compartmentalization and nanodomains on protein modification and redox signaling – current state and future challenges. Free Radical Biology and Medicine (2023).
2. Protein Oxidation in Aging, Disease, and Oxidative Stress*. Journal of Biological Chemistry (1997).
3. Conversion of Amino Acid Residues in Proteins and Amino Acid Homopolymers to Carbonyl Derivatives by Metal-catalyzed Oxidation Reactions. Journal of Biological Chemistry (1989).
4. Protein carbonylation in food and nutrition: a concise update. Amino Acids (2021).