Redox-sensitive cysteine-containing protein

A redox-sensitive cysteine-containing protein is a member of a diverse functional class of proteins that utilize the unique chemical reactivity of specific cysteine thiol groups to sense and respond to changes in the cellular redox environment (nih.gov, acs.org). These "redox switches" undergo reversible post-translational modifications, such as S-nitrosylation, S-glutathionylation, and disulfide bond formation, which alter the protein's conformation, activity, or localization (nih.gov, researchgate.net). Key examples include the antioxidant regulator Keap1, phosphatases like PTEN and PTP1B, and transcription factors such as NF-κB and Nrf2 (nih.gov, researchgate.net). Dysregulation of these redox-sensitive pathways is implicated in various pathologies, including cancer, neurodegeneration, and chronic inflammation, where oxidative stress leads to aberrant signaling (acs.org, researchgate.net). Pharmacological targeting of such proteins often involves electrophilic small molecules, such as bardoxolone methyl or dimethyl fumarate, that covalently modify reactive cysteines to activate protective pathways like the Nrf2-mediated antioxidant response (nih.gov, researchgate.net). However, the high reactivity of these thiol groups poses significant challenges for drug selectivity, potentially leading to off-target effects and toxicity (nih.gov, researchgate.net). These proteins are also critical in maintaining endoplasmic reticulum homeostasis and regulating the unfolded protein response (nih.gov). Overall, they represent a vital interface between cellular metabolism and signal transduction, making them attractive but complex therapeutic targets (acs.org).

Other names

Redox-sensitive proteinsThiol-based redox sensorsRedox-regulated proteinsCysteine-based redox switchesRedox-sensitive cysteine-containing proteins

Covalent modification of reactive cysteine thiol groups by electrophilic molecules, which modulates the activity of redox-sensitive signaling pathways, such as the activation of the Nrf2 antioxidant response or the inhibition of pro-inflammatory transcription factors like NF-κB (nih.gov, researchgate.net).