Acts as an allosteric regulator of polarized exocytosis by promoting the targeted fusion of vesicles with the plasma membrane. 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 SEC9. Belongs to the WD repeat L(2)GL family.