Evidence that alpha-synuclein does not inhibit phospholipase D.

Evidence that alpha-synuclein does not inhibit phospholipase D.
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α-突触核蛋白不抑制磷脂酶 D 的证据。

DOI:
10.1021/bi801871h
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发表时间:
2009
期刊:
影响因子:
2.9
通讯作者:
Selkoe,DennisJ
Selkoe,DennisJ
中科院分区:
生物学3区
文献类型:
--
作者:
Rappley,Irit;Gitler,AaronD;Selvy,PaigeE;LaVoie,MatthewJ;Levy,BruceD;Brown,HAlex;Lindquist,Susan;Selkoe,DennisJ

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α-突触核蛋白(αSyn)是一种功能未知的小胞浆蛋白,在大脑中高度富集。它与帕金森病 (PD) 有遗传关联,因为编码 αSyn 的基因的错义突变或增殖会导致早发的家族性帕金森病。此外,散发性和家族性 PD 的神经病理学标志路易体和路易神经突均含有不溶性 αSyn 聚集体。多项研究报告证据表明 αSyn 可以抑制磷脂酶 D (PLD),磷脂酶 D 可以水解磷脂酰胆碱形成磷脂酸和胆碱。尽管关于 αSyn 在健康和疾病中的作用存在各种假设,但迄今为止尚未报道该蛋白质的其他特定生化功能。由于 PLD 抑制可能代表 αSyn 的重要功能,因此我们试图扩展有关这种相互作用的现有报告。使用纯化的蛋白质,我们在无细胞测定中测试了 αSyn 抑制 PLD 活性的能力。我们还检查了几种细胞系和转染条件,以评估 αSyn 是否抑制培养的哺乳动物细胞中的内源性或过度表达的 PLD。在酵母中,我们扩展了之前关于 αSyn 和 PLD 依赖性表型之间相互作用的报告,其中 PLD 活性是绝对必要的。尽管测试了一系列实验条件(包括之前发表的实验条件),但我们在任何这些系统中都没有观察到 αSyn 对 PLD 的显着抑制作用。我们认为,先前报道的 αSyn 对 PLD 活性的影响可能是由于与细胞中 αSyn 过度表达相关的内质网相关应激增加所致,但不太可能是由于 αSyn 和 PLD 之间的特异性和直接相互作用。
α-Synuclein (αSyn) is a small cytosolic protein of unknown function, which is highly enriched in the brain. It is genetically linked to Parkinson’s disease (PD) in that missense mutations or multiplication of the gene encoding αSyn causes early onset familial PD. Furthermore, the neuropathological hallmarks of both sporadic and familial PD, Lewy bodies and Lewy neurites, contain insoluble aggregates of αSyn. Several studies have reported evidence that αSyn can inhibit phospholipase D (PLD), which hydrolyzes phosphatidylcholine to form phosphatidic acid and choline. Although various hypotheses exist regarding the roles of αSyn in health and disease, no other specific biochemical function for this protein has been reported to date. Because PLD inhibition could represent an important function of αSyn, we sought to extend existing reports on this interaction. Using purified proteins, we tested the ability of αSyn to inhibit PLD activity in cell-free assays. We also examined several cell lines and transfection conditions to assess whether αSyn inhibits endogenous or overexpressed PLD in cultured mammalian cells. In yeast, we extended our previous report of an interaction between αSyn and PLD-dependent phenotypes, for which PLD activity is absolutely necessary. Despite testing a range of experimental conditions, including those previously published, we observed no significant inhibition of PLD by αSyn in any of these systems. We propose that the previously reported effects of αSyn on PLD activity could be due to increased endoplasmic reticulum-related stress associated with αSyn overexpression in cells, but are not likely due to a specific and direct interaction between αSyn and PLD.
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