Probably involved in the organization of the actin cytoskeleton. May act downstream of CDC42 to induce actin filament assembly leading to cell shape changes. Induces pseudopodia formation in fibroblasts in a CDC42-dependent manner (By similarity). Interacts with CDC42 and RHOQ in a GTP-dependent manner, and with SEPT7. The CRIB domain mediates interaction with CDC42. Belongs to the BORG/CEP family.