Filensin Background Information Filensin, also referred to as CP94, CP95, or CP97, is an eye lens fiber, membrane-associated, cytoskeletal intermediate filament (IF) protein that is required for the assembly of beaded filaments, cytoskeletal networks that are necessary for the long-term maintenance of optical clarity. Phakinin copolymerizes with Filensin to make up the filamentous structures present in the beaded filaments. Filensin is also crucial for lens development since it regulates lens fiber cell shape conformation and lens transparency. Filensin contains a C-terminal non-å-helical domain that contributes in several ways to its function. The head domain of Filensin includes a di-arginine/aromatic amino acid motif that contains a potential protein kinase A phosphorylation site.
