a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion per subunit. Optimum pH is 8.0. Stable between pH 6.0 and 9.0. Optimum temperature is 50 degrees Celsius. No activity at temperatures below 25 degrees Celsius or above 60 degrees Celsius. Belongs to the phospholipase A2 family.