Regulates leading edge dynamics and cell motility in fibroblasts. May be involved in cytokinesis and signal transduction (By similarity). Forms homooligomers, but does not form complexes with the other coronins. Interacts with Arp2/3 complex components, including ACTR2, ARPC1B and ARPC2. Binds actin (By similarity). Localized to the leading edge in fibroblasts, as well as weakly along actin stress fibers. Phosphorylation on Ser-2 regulates the interaction with the Arp2/3 complex and cell motility in fibroblasts. Phosphorylation does not seem to affect subcellular location (By similarity). Belongs to the WD repeat coronin family.