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• W3131488396 abstract "Lysoplasmalogen-specific phospholipase D (LyPls-PLD) catalyzes reactions in a manner similar to those catalyzed by glycerophosphodiester phosphodiesterase (GDPD) and other well-known PLDs. Although these enzymes hydrolyze the glycerophosphodiester bond, their substrate specificities are completely different. Previously, we reported that LyPls-PLD from Thermocrispum sp. RD004668 shows only 53% activity with 1-hexadecyl-2-hydroxy-sn-glycero-3-phosphocholine (LysoPAF) relative to the 100% activity it shows with choline lysoplasmalogen (LyPlsCho). Lipoprotein-associated phospholipase A2 (Lp-PLA2 ) activity can be used to evaluate for cardiovascular disease. Hence, development of a point-of-care testing kit requires a LysoPAF-specific PLD (LysoPAF-PLD) to measure Lp-PLA2 activity. Rational site-directed mutagenesis and kinetic analysis were applied to generate LysoPAF-PLD from LyPls-PLD and to clarify the mechanisms underlying the substrate-recognition ability of LyPls-PLD. Our results suggest that LyPls-PLD variants A47, M71, N173, F211, and W282 are possibly involved in substrate recognition and that F211L may substantially alter substrate preference. Moreover, the specific activity ratio LysoPAF/LyPlsCho corresponding to F211L was up to 25-fold higher than that corresponding to the wild-type enzyme. Thus, we succeeded in switching from LyPlsCho- to LysoPAF-PLD. These results suggest that the F211L variant may be utilized to measure Lp-PLA2 activity. Kinetic analyses demonstrated that product release was the rate-limiting step of the reaction, with flexibility of the sn-1 ether-linked vinyl/alkyl chain of the substrate being essential for substrate binding and product release. Our findings may lead to a better understanding of the differences between homologous enzymes (such as PLD, sphingomyelinase D, and GDPD of the phosphatidylinositol-phosphodiesterase superfamily) in relation to substrate recognition. ENZYME: EC 3.1.4.2 (currently assigned)." @default.
• W3131488396 created "2021-03-01" @default.
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• W3131488396 date "2021-03-19" @default.
• W3131488396 modified "2023-10-12" @default.
• W3131488396 title "Switching the substrate specificity of lysoplasmalogen‐specific phospholipase D" @default.
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• W3131488396 doi "https://doi.org/10.1002/2211-5463.13123" @default.
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