Abstract
Phospholipase A2 (EC 3.1.1.4) hydrolyzes exclusively the 2acyl ester linkage of all types of naturally occurring phosphoglycerides (1). The enzyme acts highly stereospecific and only 3-snphosphoglycerides are hydrolyzed, while the stereoisomeric 1-sn-phosphoglycerides are competitive inhibitors (2). The pancreatic phospholipase A2 has a nearly absolute requirement for Ca2+ ions which bind in a 1:1 molar ratio to the enzyme at the catalytic or high-affinity site. Ba2+ and Sr2+ ions are competitive inhibitors, while Mg2+ ions are indifferent (3). So far only Gd3+ and Tb3+ ions can replace Ca2+ ions with retention of some activity (4).
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Slotboom, A.J., van Dam-Mieras, M.C.E., Jansen, E.H.J.M., Pattus, F., Verheij, H.M., de Haas, G.H. (1978). Relationship between Structure and Activity of Pancreatic Phospholipase A2 . In: Gatt, S., Freysz, L., Mandel, P. (eds) Enzymes of Lipid Metabolism. Advances in Experimental Medicine and Biology, vol 101. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9071-2_13
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