Distinguishing phosphatidic acid pools from de novo synthesis, PLD, and DGK

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Abstract

In plants, phosphatidic acid (PA) functions as a metabolic precursor in the biosynthesis of glycerolipids, but it also acts as a key signaling lipid in the response to environmental stress conditions (Testerink and Munnik, J Exp Bot 62:2349-2361, 2011). In vivo 32P-radiolabeling assays have shown the level of PA to increase within seconds/minutes of exposure to a stimulus. This response can be due to the activity of diacylglycerol kinase (DGK) and/or phospholipase D (PLD). A method is described to investigate which of the pathways is responsible for PA accumulation under a particular stress condition. First, a differential 32P-radiolabeling protocol is used to discriminate 32P-PA pools that are rapidly labeled versus those requiring long prelabeling times, reflecting DGK and PLD activities, respectively. Second, to specifically monitor the contribution of PLD, a transphosphatidylation assay is applied, which makes use of the artificial lipid phosphatidylbutanol as an in vivo marker of PLD activity. © 2013 Springer Science+Business Media, LLC.

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Arisz, S. A., & Munnik, T. (2013). Distinguishing phosphatidic acid pools from de novo synthesis, PLD, and DGK. Methods in Molecular Biology, 1009, 55–62. https://doi.org/10.1007/978-1-62703-401-2_6

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