Oxidation-induced disulfide bonds in crystalline lens proteins

Oxidation-induced disulfide bonds in crystalline lens proteins are pathological post-translational modifications that occur primarily in the alpha, beta, and gamma-crystallins of the eye. Under normal physiological conditions, the lens maintains high concentrations of reduced glutathione to prevent protein oxidation and ensure transparency. As the lens ages or is exposed to oxidative stress, cysteine residues within these proteins undergo oxidation, leading to the formation of covalent inter-protein disulfide cross-links and high-molecular-weight aggregates. These aggregates scatter light, resulting in lens opacification and vision loss, which is the fundamental biochemical basis for age-related nuclear cataracts. Therapeutic strategies focus on using small-molecule reducing agents or pharmacological chaperones to break these bonds or prevent their formation, thereby restoring protein solubility and lens clarity. Targeting these bonds offers a potential non-surgical alternative to cataract extraction, which remains the leading cause of blindness worldwide.

Other names

Lens protein disulfide cross-linksOxidized crystallin aggregatesProtein-protein disulfide bonds in the lensCrystallin disulfide bridges

Reduction of pathological inter-protein disulfide bonds to restore protein solubility and lens transparency.