Clathrin triskelions, composed of 3 heavy chains and 3 light chains, are the basic subunits of the clathrin coat. In the presence of light chains, hub assembly is influenced by both the pH and the concentration of calcium. Interacts with HIP1. Interacts with DENND1A, DENND1B and DENND1C (By similarity). May interact with OCRL. Interacts with ERBB2 (By similarity).