a phosphate monoester + H2O = an alcohol + phosphate Binds 1 Fe cation per subunit. Binds 1 zinc ion per subunit. Inhibited by compounds CC24201, CC27209, and MO07123 (PubMed:22943065). Inhibited by the tetraoxoanions molybdate and phosphate (PubMed:12054466). Not inhibited by EDTA or tartrate (PubMed:12054466). Optimum pH is 6.1. Homodimer; disulfide-linked. Belongs to the metallophosphoesterase superfamily. Purple acid phosphatase family.