With CysN forms the ATP sulfurylase (ATPS) that catalyzes the adenylation of sulfate producing adenosine 5'-phosphosulfate (APS) and diphosphate, the first enzymatic step in sulfur assimilation pathway. APS synthesis involves the formation of a high-energy phosphoric-sulfuric acid anhydride bond driven by GTP hydrolysis by CysN coupled to ATP hydrolysis by CysD. ATP + H(+) + sulfate = adenosine 5'-phosphosulfate + diphosphate Antibiotic biosynthesis; mitomycin C biosynthesis. Belongs to the PAPS reductase family. CysD subfamily.