The beta subunit of actin capping protein that regulates actin cytoskeleton assembly and establishment of initial asymmetry in the embryo; it is expressed in the cytoplasm of all cells in the embryo.
Enables actin filament binding activity. Involved in actin cytoskeleton organization and embryonic axis specification. Located in cytoplasm. Part of dynactin complex. Expressed in tail. Is an ortholog of human CAPZB (capping actin protein of muscle Z-line subunit beta).