ATP + H(+) + sulfate = adenosine 5'-phosphosulfate + diphosphate adenosine 5'-phosphosulfate + ATP = 3'-phosphoadenylyl sulfate + ADP + H(+) Sulfur metabolism; hydrogen sulfide biosynthesis; sulfite from sulfate: step 1/3. Sulfur metabolism; hydrogen sulfide biosynthesis; sulfite from sulfate: step 2/3. In the N-terminal section; belongs to the APS kinase family. In the C-terminal section; belongs to the sulfate adenylyltransferase family.