Enables actin filament binding activity and identical protein binding activity. Involved in cellular response to fluid shear stress; negative regulation of epithelial cell proliferation; and urogenital system development. Acts upstream of or within several processes, including actin filament polymerization; adherens junction maintenance; and magnesium ion homeostasis. Located in adherens junction and cytoplasm. Is expressed in several structures, including central nervous system; metanephros; myotome; sensory organ; and spleen. Used to study non-Hodgkin lymphoma. Orthologous to human MTSS1 (MTSS I-BAR domain containing 1). [provided by Alliance of Genome Resources, Apr 2022]