May be involved in plant defense signaling. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Palmitoylation at Cys-3 and Cys-7 are required for plasma membrane location. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.