Serine/threonine-protein kinase involved in the control of sugar metabolism and translation. Phosphorylates UGP1, which is required for normal glycogen and beta-(1,6)-glucan synthesis. This phosphorylation shifts glucose partitioning toward cell wall glucan synthesis at the expense of glycogen synthesis. Phosphorylates also the glycogen synthase GSY2 and the translation factors CAF20, TIF11 and SRO9. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Present with 2220 molecules/cell in log phase SD medium. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.