Regulates lamellipodial actin dynamics in a CTTN-dependent manner. May form homomers (By similarity). May interact with MOB4, PPP2R1A, PPP2CB, STK24, STK25, STK26, STRN4, STRIP1 and STRIP2. Interacts with CTTN/cortactin; this interaction may redistribute CTTN to stress fibers (By similarity).