Hydrolyzes the bond between sulfate and the aromatic ring in a compound such as 4-nitrocatechol sulfate. an aryl sulfate + H2O = a phenol + H(+) + sulfate Binds 1 Ca(2+) ion per subunit. Optimum pH is 8.9. Optimum temperature is 57 degrees Celsius. Incubation that exceeds 20 minutes above 50 degrees Celsius leads to enzyme inactivation. Monomer. The conversion to 3-oxoalanine (also known as C-formylglycine, FGly), of a serine or cysteine residue in prokaryotes and of a cysteine residue in eukaryotes, is critical for catalytic activity. Belongs to the sulfatase family.