Mediates selenate (Se) reduction, and promotes Se and sulfur (S) uptake and assimilation. ATP + H(+) + sulfate = adenosine 5'-phosphosulfate + diphosphate Sulfur metabolism; hydrogen sulfide biosynthesis; sulfite from sulfate: step 1/3. Homotetramer. Repressed locally and systemically by phloem-translocated glutathione (GSH). Belongs to the sulfate adenylyltransferase family. Truncated N-terminus.