Ocular lens crystallin protein (Crystallin)

Ocular lens crystallin proteins are the primary structural components of the vertebrate eye lens, constituting up to 90% of its water-soluble protein content [1]. They are categorized into three main families: alpha, beta, and gamma crystallins, which are organized in a high-density gradient to maintain lens transparency and refractive power [2]. Alpha-crystallins, in particular, function as small heat-shock proteins (sHSPs) that act as molecular chaperones to prevent the irreversible aggregation of denatured proteins [3]. Since the lens does not undergo protein turnover, these proteins are susceptible to lifelong accumulation of oxidative damage and post-translational modifications [4]. This damage eventually leads to protein misfolding and the formation of large, light-scattering aggregates, resulting in cataracts, the leading cause of blindness worldwide [5]. Pharmacological interventions, such as lanosterol and chaperone-mimetic compounds, are being investigated for their ability to stabilize crystallins or dissolve existing aggregates to restore lens clarity [6, 7]. Sources: [1] Slingsby et al. (2013) Exp Eye Res; [2] Hejtmancik et al. (2015) Prog Retin Eye Res; [3] Horwitz (1992) PNAS; [4] Truscott (2005) Exp Eye Res; [5] Zhao et al. (2015) Nature; [6] Makley et al. (2015) Science; [7] Molnar et al. (2019) Exp Eye Res.

Other names

Lens crystallinsAlpha-crystallinBeta-crystallinGamma-crystallinCRY proteinsCrystallin superfamily

Small-molecule binding to crystallin proteins to stabilize their native fold and prevent or reverse the formation of light-scattering amyloid-like aggregates, thereby restoring lens clarity [5, 6].