Catalyzes the synthesis of activated sulfate. Essential for plant reproduction and viability. Required for the production of glucosinolates. adenosine 5'-phosphosulfate + ATP = 3'-phosphoadenylyl sulfate + ADP + H(+) Sulfur metabolism; hydrogen sulfide biosynthesis; sulfite from sulfate: step 2/3. Interacts with APK1. Expressed in root vasculature, root tips, leaf epidermal cells and funiculus of developing seeds. No visible phenotype under normal growth conditions. Apk1 and apk2 double mutant exhibits a semi-dwarf phenotype. Belongs to the APS kinase family.