Acts as an allosteric regulator of polarized exocytosis by promoting the targeted fusion of vesicles with the plasma membrane. Coordinates the spatial and temporal nature of both Rab-dependent tethering and SNARE-dependent membrane fusion of exocytic vesicles with the plasma membrane. Required for targeting of the sodium pumping ATPase ENA1 to the Cell Surface, thus being involved in maintenance of ion homeostasis in cells exposed to NaCl stress. May be involved in the targeting of the myosin proteins to their intrinsic pathways. Multicopy suppressor of RHO3. May also participate in the maintenance of cell polarity and bud growth. Interacts with MYO2 and SEC9. Belongs to the WD repeat L(2)GL family.