Negatively regulates pheromone signaling during mating. Acts in a negative feedback loop that is essential for the mating process. This loop acts to down-regulate cellular sensitivity to pheromone. Activated by ste11. By nitrogen starvation and pheromone. The fungal-differentiation regulator (Fungal-DR) domain is only found in fungal regulator of G-protein signaling (RGS) proteins that regulate differentiation pathways. It is required for function.