Component of the exocyst complex involved in the docking of exocytic vesicles with fusion sites on the plasma membrane. The exocyst complex is composed of SEC3, SEC5, SEC6, SEC8, SEC10, SEC15, EXO70 and EXO84. Interacts with SEC4. 25% cytoplasmic. 75% is associated with the cell membrane. Present with 4280 molecules/cell in log phase SD medium. Belongs to the SEC15 family.