May be a crucial component of the cytoskeleton of highly motile cells, functioning both in the invagination of large pieces of plasma membrane, as well as in forming protrusions of the plasma membrane involved in cell locomotion. Binds actin. phosphorylation at Ser-412 by PKC strongly down-regulates the association with actin. Polyubiquitinated by RNF128 with 'Lys-48'-linked chains, leading to proteasomal degradation. Belongs to the WD repeat coronin family.