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- W154465914 abstract "Theaction of pig pancreatic phospholipase A2 (EC 3.1.1.4) on phosphatidylcholine bilayer is studied under a variety of substrate modification conditions including the incorporation of long chain alcohols (hexanol and several isomeric octanols) into the bilayer. The rate of hydrolysis shows a biphasic dependence upon the concentration of the activating alcohol. The hexanol to lipid molar ratio in the bilayer is approximately 1.4:1 at the optimal alkanol concentration. The lag phase at the beginning of hydrolysis has been shown to depend upon the nature of the bilayer as modified by different alkanols and by intrinsic differences in the unilamellar vesicles (approximate diameter approximately 250 A) compared to the multilamellar vesicles. The rate constant for the activation process responsible for the lag period is first order and does not depend upon the concentration of the enzyme, substrate, alkanol, and calcium. These and other experiments are interpreted in terms of a hypothesis that the pancreatic phospholipase interacts with the bilayer by a catalytic and a recognition site. The data suggest that the packing of the interface regulates the interaction of both the catalytic and the recognition site. It is postulated that the biphasic activation profile as a function of hexanol concentration may be a consequence of two-site interactions between the enzyme and the substrate interface." @default.
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- W154465914 date "1978-10-01" @default.
- W154465914 modified "2023-09-27" @default.
- W154465914 title "Lag phase during the action of phospholipase A2 on phosphatidylcholine modified by alkanols." @default.
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- W154465914 doi "https://doi.org/10.1016/s0021-9258(17)38021-3" @default.
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