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
中科院分区:
文献类型:
--
作者:
Rappley,Irit;Gitler,AaronD;Selvy,PaigeE;LaVoie,MatthewJ;Levy,BruceD;Brown,HAlex;Lindquist,Susan;Selkoe,DennisJ
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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