Spatial reorganization of low-molecular-weight proteins during cold cataract opacification.

Freeze-fracture electron microscopy of calf lens nuclear cytoplasm undergoing a cold cataract opacification shows the formation of domains within the bulk cytoplasm. The size distribution of these domains (from a few tens of nanometers to a few micrometers) is compatible with previous size evaluations obtained from light scattering experiments for the 'large scattering elements' responsible for cold cataract opacification. In addition, these domains appear to be devoid of crystallins of higher molecular weight and enriched in low-molecular-weight species.