Predicted to enable G protein-coupled receptor binding activity. Acts upstream of or within several processes, including endothelial to hematopoietic transition; regulation of microglial cell activation; and regulation of signal transduction. Predicted to be located in several cellular components, including clathrin-coated pit; cytoplasmic vesicle; and pseudopodium. Predicted to be active in cytoplasm. Is expressed in neural rod. Orthologous to human ARRB1 (arrestin beta 1).