Required for heat stress-instigated phosphorylation of BCY1 which is involved in cell wall integrity signaling. Regulates activity of MSN2, a transcription factor that binds to the stress-response element (STRE). Probably promotes formation of a complex between MSN2 and DNA. Regulates the stability of ROG1. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.