Involved in the secretory pathway as part of the exocyst complex which tethers secretory vesicles to the sites of exocytosis. Plays a role in the assembly of the exocyst. The exocyst complex is composed of SEC3, SEC5, SEC6, SEC8, SEC10, SEC15, EXO70 and EXO84. Interacts with RHO3. Its polarization in the cell depends on EXO84. Present with 4280 molecules/cell in log phase SD medium. Belongs to the EXO70 family.