Redox-sensitive mitochondrial and cytosolic proteins

Redox-sensitive mitochondrial and cytosolic proteins constitute a diverse group of proteins whose functions are regulated by the cellular reduction-oxidation (redox) state, primarily through the modification of reactive cysteine thiol groups [PMC3614623]. In the cytosol, key examples include the transcription factor Nrf2 and its inhibitor Keap1, which orchestrate the antioxidant response, as well as various protein kinases and phosphatases involved in signal transduction [PubMed: 22669173]. Mitochondrial redox-sensitive proteins include components of the electron transport chain and metabolic enzymes like aconitase, which are particularly susceptible to oxidative inactivation by reactive oxygen species (ROS) [PubMed: 15128444]. Dysregulation of these redox-sensitive pathways is implicated in the pathogenesis of cancer, where it supports survival, and in neurodegenerative diseases like Parkinson's and Alzheimer's, where oxidative damage leads to protein aggregation and cell death [PubMed: 28235565]. Pharmacological intervention typically involves electrophilic molecules that activate protective pathways (e.g., Nrf2 activators) or antioxidants designed to scavenge ROS within specific compartments like the mitochondria [PubMed: 30585954]. These proteins serve as critical redox switches that allow the cell to adapt to metabolic demands and environmental stressors.

Other names

Redox-regulated proteinsThiol-based redox switchesOxidative stress-responsive proteinsRedox-sensitive proteome

Modulation of reactive cysteine residues and activation of endogenous antioxidant response pathways to restore redox homeostasis.