Required for receptor inhibition of inappropriately expressed a-factor receptor (STE3) in MAT a cells. Inhibits signaling by relocalizing the G protein beta-gamma (STE4-STE18) subunit to intracellular membranes. May also be a mechanism for the down-regulation of the mating pheromone response after the zygotic fusion event, promoting the transition of the new diploid cell to vegetative growth (By similarity). Induced by alpha-pheromone. Repressed by the ALPHA2-MCM1 repressor (By similarity).