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Phospholipase D hydrolyzes short-chain analogs of phosphatidylcholine in the absence of detergent

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Lipids

Abstract

Phospholipase D is an important enzyme in signal transduction in neuronal tissue. A variety of assays have been used to measure phospholipase D activity in vitro. The most typical measure of phospholipase D activity is the production of phosphatidylethanol in the presence of ethanol. Phosphatidylethanol is a product of transphosphatidylation activity that is considered a unique property of phospholipase D. To support transphosphatidylation activity, high concentrations of ethanol may be required. Furthermore, most assays in the literature utilize a detergent. These extreme conditions, detergent and ethanol, may alter phospholipase D and hinder the study of its regulation. In this manuscript we describe an assay that eliminates these potentially confounding conditions. It utilizes high specific activity [3H]butanol as a nucleophilic receptor. This eliminates the need for high concentrations of alcohol. The substrate is an analog of phosphatidylcholine that contains short-chain fatty acids, 1,2-dioctanoyl-sn-glycero-3-phosphocholine. Phospholipase D readily hydrolyzes this substrate in the absence of detergent. This novel assay should be useful in the further characterization of phospholipase D.

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Abbreviations

CMC:

critical micellar concentration

K M :

Michaelis constant

PC8:

1,2-dioctanoyl-sn-glycero-3-phosphocholine

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Correspondence to Joel Horwitz.

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Davis, L.L., Maglio, J.J. & Horwitz, J. Phospholipase D hydrolyzes short-chain analogs of phosphatidylcholine in the absence of detergent. Lipids 33, 223–227 (1998). https://doi.org/10.1007/s11745-998-0199-5

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  • DOI: https://doi.org/10.1007/s11745-998-0199-5

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