Clathrin is the major protein of the polyhedral coat of coated pits and vesicles. Clathrin coats are formed from molecules containing 3 heavy chains and 3 light chains. Cytoplasmic face of coated pits and vesicles. Localized to punctae scattered within the cytoplasm, along the plasma membrane and concentrated in the perinuclear region. Cells fail to undergo cytokinesis in suspension culture and show osmoregulation defects. Late development is impaired in mutants lacking clc which produce misshapen projections rather than a fruiting body. Mutants lacking clc showed a reduction in the ability of clathrin to assemble onto membrane, though assembly of clathrin heavy chain triskelions was unaffected. Belongs to the clathrin light chain family.