PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. 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 8.2. Stable when incubated for 10 minutes between pH 2 and 11. Retains 70% of its activity when incubated for 10 minutes at pH 1.5. Stable after incubation at 70 degrees Celsius for 10 minutes. Retains 80% of its activity after incubation at 80 degrees Celsius for 20 minutes. Belongs to the phospholipase A2 family.