Possesses adenylylsulfatase activity in vitro, releasing AMP and sulfate from adenylyl sulfate. Possesses also adenosine 5'-phosphosulfate (APS) phosphorylase activity in vitro. Catalyzes the phosphorolysis of APS, leading to ADP and sulfate. ADP + H(+) + sulfate = adenosine 5'-phosphosulfate + phosphate adenosine 5'-phosphosulfate + H2O = AMP + 2 H(+) + sulfate The adenosine 5'-phosphosulfate phosphorylase activity is enhanced at low pH. Homodimer. Extended C-terminus. The predicted gene has been split into 3 genes: At4g16560, At4g16563 and At4g16566. The predicted gene has been split into 3 genes: At4g16560, At4g16563 and At4g16566.