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. {ECO:0000269|PubMed:10490598, ECO:0000269|PubMed:11035016}. This is the function of CDC42EP3 (CDC42 effector protein 3, Ensembl gene identifier ENSG00000163171).