Protein kinase that is part of growth control pathway which is at least partially redundant with the cAMP pathway. Required for trehalase activation. 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. AGC Ser/Thr protein kinase family. cAMP subfamily.