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Effects of inorganic phosphorus compounds on the hydrolysis of phosphatidylcholine liposomes by phospholipid-deacylating enzymes

Sultana, G.N.; Watanabe, Y.; Tamai, Y.

Biotechnology and Applied Biochemistry 21(1): 101-110

1995

ISSN/ISBN: 0885-4513
PMID: 7710702
Document Number: 449736
Structural requirements of inorganic phosphorus compounds as specific activators or inhibitors for phospholipase A-2 and phospholipase B were investigated using orthophosphate, pyrophosphate and polyphosphate. It was observed that orthophosphate and pyrophosphate stimulated the activities of phospholipase A-2 from bee venom, snake (Naja naja) venom and pig pancreas, and also phospholipase B from the yeast Torulaspora delbrueckii. However, polyphosphate was found to act as an inhibitor for phospholipase A-2 in the above species and also for phospholipase B from T. delbrueckii. Orthophosphate and pyrophosphate induced gradual aggregation of liposome, but polyphosphate prolonged the lifetime of the liposome, suggesting that orthophosphate and pyrophosphate destabilize the bilayer structure of phosphatidylcholine and polyphosphate stabilizes it.

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