Cellular redox-sensitive proteins

Cellular redox-sensitive proteins represent a broad class of proteins whose functional activity is regulated by the cellular reduction-oxidation (redox) environment. These proteins typically contain highly reactive cysteine or methionine residues that undergo reversible post-translational modifications, such as S-nitrosylation or disulfide formation, in response to reactive oxygen species (ROS) (Antioxidants & Redox Signaling, 2017). Key examples include the transcription factor Nrf2 and its inhibitor Keap1, which together orchestrate the cellular antioxidant response (Nature Reviews Drug Discovery, 2014). Other members include various phosphatases, such as PTEN, and kinases that serve as molecular switches linking oxidative stress to signaling pathways like PI3K/Akt and MAPK (Journal of Biological Chemistry, 2003). In many diseases, including cancer and neurodegeneration, the redox balance is disrupted, leading to the aberrant activation or inhibition of these proteins. Therapeutic targeting of redox-sensitive proteins often involves electrophilic small molecules that covalently modify specific thiols to restore homeostasis or induce protective gene expression (Pharmacological Reviews, 2016). However, the widespread nature of these redox switches poses significant challenges for drug specificity and can lead to off-target effects or systemic toxicity.

Other names

Redox-regulated proteinsThiol-based redox sensorsOxidative stress-responsive proteins

Covalent modification of reactive cysteine residues, induction of the antioxidant response element (ARE) gene expression, and modulation of protein-protein interactions through redox-sensitive conformational changes.