Plays a role in the reorganization of the actin cytoskeleton. Contributes with NCK1 and GRB2 in the recruitment and activation of WASL. Plays a role in the formation of cell ruffles (By similarity). May participate in regulating the subcellular localization of WASL, resulting in the disassembly of stress fibers in favor of filopodia formation. Binds to WAS within the N-terminal region, at a site distinct from the CDC42-binding site. Binds profilin and actin. Interacts with DBNL (By similarity). Binds to WASL. Interacts with DBNL. Interacts with FNBP1L (via the SH3 domain) (By similarity). 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. A number of isoforms are produced. Isoforms were differentially expressed. One isoform was ubiquitously expressed, another was muscle-specific and another was expressed in the liver, heart and testis. Belongs to the verprolin family.