Model of Tda2–Aim21 complex function in CME. Tda2 is a TcTex1-type dynein light chain homologue and exists as a stable homodimer. Tda2 associates with Aim21 into a stable complex in which Tda2 likely acts as an Aim21 “dimerization chaperone.” The Tda2–Aim21 complex is recruited to endocytic sites via interaction with Bbc1, a component of the WASp/Myo module. The Tda2–Aim21 complex interacts physically with actin-capping protein and mediates its recruitment to the barbed end of actin filaments.