Detection of choline and phosphatidic acid (PA) catalyzed by phospholipase D (PLD) using MALDI-QIT-TOF/MS with 9-aminoacridine matrix |
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| Authors: | Kyung-eui Park Jun-dal Kim Yusuke Nagashima Koichiro Kako Hiroaki Daitoku Motoki Matsui |
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| Institution: | 1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan;2. Life Science Center, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, Japan;3. Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan |
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| Abstract: | Phospholipase D (PLD) catalyzes the hydrolysis of phosphatidylcholine (PC), the most abundant phospholipids of plasma membrane, resulting in the production of choline and phosphatidic acid (PA). Choline is a precursor of the neurotransmitter acetylcholine, whereas PA functions as an intracellular lipid mediator of diverse biological functions. For assessing PLD activity in vitro, PLD-derived choline has been often analyzed with radioactive or non-radioactive methods. In this study, we have developed a new method for detecting choline and PA with MALDI-QIT-TOF/MS by using 9-aminoacridine as a matrix. The standard calibration curves showed that choline and PA could be detected with linearity over the range from 0.05 and 1?pmol, respectively. Importantly, this method enables the concomitant detection of choline and PA as a reaction product of PC hydrolysis by PLD2 proteins. Thus, our simple and direct method would be useful to characterize the enzymatic properties of PLD, thereby providing insight into mechanisms of PLD activation. |
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| Keywords: | phosphatidylcholine hydrolysis phospholipase D activity choline phosphatidic acid MALDI-QIT-TOF/MS analysis |
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