Reactive oxygen species, electrophiles, and disulfide bonds

Reactive oxygen species (ROS), electrophiles, and disulfide bonds represent a broad category of chemical entities and structural motifs that govern cellular redox homeostasis and signaling. ROS, such as superoxide and hydrogen peroxide, and various electrophiles are produced during normal metabolism or in response to external stressors, acting as signaling molecules at low concentrations but causing damage to DNA, lipids, and proteins at high levels (Source: NIH, StatPearls). Disulfide bonds are essential for the structural integrity of proteins and are dynamically regulated by the redox environment, often serving as molecular switches for protein function (Source: Nature Reviews Drug Discovery). The primary biological sensor for these species is the Keap1-Nrf2 pathway, where reactive cysteines on Keap1 detect chemical modifications and trigger a protective antioxidant response. In many diseases, such as cancer and neurodegeneration, an imbalance in these species leads to pathological oxidative stress. Pharmacological intervention typically involves either neutralizing these species with antioxidants or using electrophilic compounds to prime the body's endogenous antioxidant defenses via the Nrf2 pathway (Source: PubChem).

Other names

Oxidative stress markersElectrophilic stressorsRedox-active speciesReactive speciesRedox status

Drugs targeting these species or their sensors typically act by covalently modifying cysteine residues on the Keap1 protein to activate the Nrf2 antioxidant response, or by directly scavenging reactive oxygen species to mitigate oxidative damage (Source: PubMed PMID: 23238471, 25672622).