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