F-actin-capping proteins bind in a Ca(2+)-independent manner to the fast growing ends of actin filaments (barbed end) thereby blocking the exchange of subunits at these ends. Unlike other capping proteins (such as gelsolin and severin), these proteins do not sever actin filaments. Heterodimer of an alpha and a beta subunit. Found at cortical actin spots at the site of bud emergence and at the tips of growing buds and shmoos. Present with 6770 molecules/cell in log phase SD medium. Belongs to the F-actin-capping protein beta subunit family.