Plays a role in the reorganization of the actin cytoskeleton. Contributes with NCK1 and GRB2 in the recruitment and activation of WASL. May participate in regulating the subcellular localization of WASL, resulting in the disassembly of stress fibers in favor of filopodia formation. Plays a role in the formation of cell ruffles (By similarity). Plays an important role in the intracellular motility of vaccinia virus by functioning as an adapter for recruiting WASL to vaccinia virus. Binds to WAS, profilin and actin. Binds to WASL (By similarity). Interacts with DBNL. Interacts with FNBP1L (via the SH3 domain) (PubMed:19798448). Vesicle surfaces and along actin tails. Colocalizes with actin stress fibers. When coexpressed with WASL, no longer associated with actin filaments but accumulated in perinuclear and cortical areas like WASL (By similarity). Highly expressed in peripheral blood mononuclear cells, spleen, placenta, small intestine, colon and thymus. Lower expression in ovary, heart, brain, lung, liver, skeletal muscle, kidney, pancreas, prostate and testis. Binds to WAS within the N-terminal region 170, at a site distinct from the CDC42-binding site. The disease is caused by variants affecting the gene represented in this entry. Recruited to PIP5K-induced vesicle surfaces in the absence of functional WASL. Belongs to the verprolin family.