Catalyzes the phosphorylation of adenosine 5'-phosphosulfate to 3'-phosphoadenylyl sulfate, which is the activated sulfate form for sulfation reactions. Essential for plant reproduction and viability. adenosine 5'-phosphosulfate + ATP = 3'-phosphoadenylyl sulfate + ADP + H(+) Sulfur metabolism; hydrogen sulfide biosynthesis; sulfite from sulfate: step 2/3. Homodimer; disulfide-linked. Expressed in root vasculature, root tips, leaf epidermal and guard cells, pollen grains and radicle of immature seeds. No visible phenotype under normal growth conditions. Belongs to the APS kinase family. Truncated N-terminus.