Protein kinase that functions as regulator in the pheromone-induced mating pathway downstream of mitogen-activated protein kinase (MAPK) FUS3. Diminishes transcriptional induction of genes in response to pheromone signaling. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] By the macrolide rapamycin in a TOR-dependent manner. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.