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An improved protein lipid overlay assay for studying lipid-protein interactions.
Plant Methods ( IF 5.1 ) Pub Date : 2020-03-06 , DOI: 10.1186/s13007-020-00578-5
Xiuli Han 1 , Yongqing Yang 2 , Fengyun Zhao 1 , Tianren Zhang 2 , Xiang Yu 2
Affiliation  

Background Lipids perform multiple functions in the cell, and lipid-protein interactions play a key role in metabolism. Although various techniques have been developed to study lipid-protein interactions, the interacting protein partners that bind to most lipids remain unknown. The protein lipid overlay (PLO) assay has revealed numerous lipid-protein interactions, but its application suffers from unresolved technical issues. Results Herein, we found that blocking proteins may interfere with interactions between lipids and their binding proteins if a separate blocking step is carried out before the incubation step in the PLO assay. To overcome this, we modified the PLO assay by combining an incubation step alongside the blocking step. Verification experiments included phosphatidylinositol-3-phosphate (PI3P) and its commercially available interacting protein G302, C18:1, C18:2, C18:3 and the Arabidopsis plasma membrane H+-ATPase (PM H+-ATPase) AHA2 C-terminus, phosphatidylglycerol (PG) and AtROP6, and phosphatidylserine (PS) and the AHA2 C-terminus. The lipid-protein binding signal in the classical PLO (CPLO) assay was weak and not reproducible, but the modified PLO (MPLO) assay displayed significantly improved sensitivity and reproducibility. Conclusions This work identified a limitation of the CPLO assay, and both sensitivity and reproducibility were improved in the modified assay, which could prove to be more effective for investigating lipid-protein interactions.

中文翻译:

一种改进的蛋白质脂质覆盖测定法,用于研究脂质-蛋白质相互作用。

背景脂质在细胞中发挥多种功能,脂质-蛋白质相互作用在新陈代谢中起关键作用。尽管已经开发了各种技术来研究脂质-蛋白质相互作用,但与大多数脂质结合的相互作用蛋白质伙伴仍然未知。蛋白质脂质覆盖 (PLO) 测定揭示了许多脂质-蛋白质相互作用,但其应用存在未解决的技术问题。结果 在本文中,我们发现如果在 PLO 测定中的孵育步骤之前进行单独的封闭步骤,封闭蛋白可能会干扰脂质与其结合蛋白之间的相互作用。为了克服这个问题,我们通过将孵育步骤与封闭步骤相结合来修改 PLO 检测。验证实验包括 3-磷酸磷脂酰肌醇 (PI3P) 及其市售的相互作用蛋白 G302、C18:1、C18:2、C18:3 和拟南芥质膜 H+-ATPase (PM H+-ATPase) AHA2 C-末端、磷脂酰甘油(PG) 和 AtROP6,以及磷脂酰丝氨酸 (PS) 和 AHA2 C 端。经典 PLO (CPLO) 测定中的脂蛋白结合信号较弱且不可重复,但改进的 PLO (MPLO) 测定显示出显着提高的灵敏度和重现性。结论 这项工作确定了 CPLO 检测的局限性,改进后的检测方法的灵敏度和重现性都得到了提高,这可能证明对研究脂质-蛋白质相互作用更有效。磷脂酰甘油 (PG) 和 AtROP6,以及磷脂酰丝氨酸 (PS) 和 AHA2 C 末端。经典 PLO (CPLO) 测定中的脂蛋白结合信号较弱且不可重复,但改进的 PLO (MPLO) 测定显示出显着提高的灵敏度和重现性。结论 这项工作确定了 CPLO 检测的局限性,改进后的检测方法的灵敏度和重现性都得到了提高,这可能证明对研究脂质-蛋白质相互作用更有效。磷脂酰甘油 (PG) 和 AtROP6,以及磷脂酰丝氨酸 (PS) 和 AHA2 C 末端。经典 PLO (CPLO) 测定中的脂蛋白结合信号较弱且不可重复,但改进的 PLO (MPLO) 测定显示出显着提高的灵敏度和重现性。结论 这项工作确定了 CPLO 检测的局限性,改进后的检测方法的灵敏度和重现性都得到了提高,这可能证明对研究脂质-蛋白质相互作用更有效。
更新日期:2020-04-22
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