Predicted to contribute to small GTPase binding activity. Involved in positive regulation of actin filament polymerization and positive regulation of lamellipodium assembly. Acts upstream of or within several processes, including apical protein localization; embryonic morphogenesis; and segmentation. Located in lamellipodium and ruffle. Part of filamentous actin. Is active in postsynapse. Is expressed in several structures, including alimentary system; genitourinary system; immune system; nervous system; and sensory organ. Orthologous to human NCKAP1 (NCK associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]