Alkaline phosphatase with broad substrate specificity. Has phosphatase activity towards nucleotide phosphates with a preference for ATP. Active towards a great variety of phosphomonoesters with the exception of 2',3'-cyclic AMP and myo-inositol hexakisphosphate. a phosphate monoester + H2O = an alcohol + phosphate Binds 2 Zn(2+) ions. Strongly inhibited by orthovanadate and EDTA. Also inhibited by inorganic phosphate. Optimum pH is 8.5 with 4-nitrophenyl phosphate as substrate. Has 50% residual activity at pH 7.5 and 30% at pH 9.0, being virtually inactive at pH 10 and at pH 5 or lower. Heat-labile. Incubation for 10 minutes at 50 or 60 degrees Celsius causes 40% and 60% inactivation, respectively. Heating at 100 degrees Celsius for 2 minutes causes total loss of activity. Heat-inactivated enzyme cannot be renaturated. Expression is not repressed by inorganic phosphate.