because ca2+-dependent phospholipases a2 degrade the phospholipids of escherichia coli , treated with the membrane-active antibiotic polymixin b equally well with and without added ca2+ ( weiss , j. , beckerdite-quagliata , s. , and elsbach , p. ( 1979 ) j. biol . chem . 254 , 11010-11014 ) , we have examined the possibility that intramembrane ca2+ can provide the ca2+ needed for phospholipase action .
C0031667
phospholipases a2
C0031671
phospholipase