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J. Biol. Chem., Vol. 265, Issue 12, 6675-6681, 04, 1990

Purification of a cellular (granulocyte) and an extracellular (serum) phospholipase A2 that participate in the destruction of Escherichia coli in a rabbit inflammatory exudate

GW Wright, CE Ooi, J Weiss and P Elsbach
Department of Medicine, New York University School of Medicine, New York 10016.

A granule-associated phospholipase A2 from rabbit polymorphonuclear leukocytes and a closely similar phospholipase A2 from rabbit serum have been purified to near homogeneity by ion-exchange and reverse- phase chromatography. The cellular (polymorphonuclear leukocyte) phospholipase A2 has been purified greater than 100,000-fold and the extracellular (serum) phospholipase A2 approximately 60,000-fold. The NH2-terminal amino acid sequence of the ascitic fluid phospholipase A2 that we have recently purified from inflammatory exudates produced in rabbits is nearly identical (15 of 16 residues) to that of the polymorphonuclear leukocyte phospholipase A2 and completely identical (19 of 19 residues) to that of the purified serum phospholipase A2. The functional properties of these three phospholipases A2 are indistinguishable. Each enzyme is active against Escherichia coli killed by the bactericidal/permeability-increasing protein of polymorphonuclear leukocyte, a property shared only by a subset of phospholipases A2. The presence of structurally and functionally very closely similar phospholipases A2 in the cellular and extracellular compartments of an inflammatory exudate is consistent with the apparent role of these enzymes in the destruction of certain microbial invaders during the acute inflammatory response.
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