Involved in the gluconeogenesis. Catalyzes the conversion of oxaloacetate (OAA) to phosphoenolpyruvate (PEP) through direct phosphoryl transfer between the nucleoside triphosphate and OAA. ATP + oxaloacetate = ADP + CO2 + phosphoenolpyruvate Carbohydrate biosynthesis; gluconeogenesis. Belongs to the phosphoenolpyruvate carboxykinase (ATP) family.