Not essential for growth. Inhibits early G-protein signaling events following pheromone stimulation. May help create heterodimerizable beta-tubulin by facilitating the efficient transfer of nascent beta-tubulin polypeptides to the folding apparatus. Interacts with the G protein beta-gamma subunit complex (STE4-STE18 complex). Present with 2250 molecules/cell in log phase SD medium. Belongs to the phosducin family.