A protein complex that regulates PtdIns(3,5)P2 levels.

A protein complex that regulates PtdIns(3,5)P2 levels.
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DOI:
10.1038/emboj.2008.270
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发表时间:
2009-01-21
期刊:
影响因子:
11.4
通讯作者:
Dove, Stephen K.
Dove, Stephen K.
中科院分区:
生物学1区
文献类型:
--
作者:
Michell, Robert H.;Dove, Stephen K.

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磷脂酰肌醇 3, 5-二磷酸 (PtdIns (3, 5) P2) 是溶酶体和晚期内体区室逆行膜运输所必需的,其合成受到严格调控。但细胞如何调节 PtdIns (3, 5) P2 合成(例如,响应高渗休克)仍不清楚。 Weisman 小组的一篇论文给出了迄今为止控制 PtdIns (3, 5) P2 合成的多蛋白复合物的最完整图片,并解释了 VAC14 突变如何在功能上损害复合物核心的支架蛋白并导致小鼠神经退行性疾病。自从十年前发现磷脂酰肌醇 3, 5-二磷酸 (PtdIns (3, 5) P2) 以来(Dove 等人, 1997),已经清楚它是一种普遍存在的真核生物磷酸肌醇,丰度非常低。 PtdIns (3, 5) P2 可能具有多种功能,其中最好的特征是支持并可能调节从溶酶体和晚期内体区室到高尔基复合体的逆行膜运输(Dove 等人,2004;Efe 等人,2005;Michell 等人,2006;Shisheva,2008)。 PtdIns (3, 5) P2 功能所必需的几种蛋白质的遗传丢失或功能障碍对于酵母和动物都是有害的(参考文献参见 Jin 等人 (2008))。直到最近,关于如何调节细胞 PtdIns (3, 5) P2 水平的第一个真正的线索——例如,高渗休克如何刺激合成——才开始出现,这就是本研究要解决的问题(Jin 等,2008)。
Phosphatidylinositol 3, 5-bisphosphate (PtdIns (3, 5) P2) is needed for retrograde membrane trafficking from lysosomal and late endosomal compartments and its synthesis is tightly regulated. But how cells regulate PtdIns (3, 5) P2 synthesis—for example, in response to hyperosmotic shock—remains unexplained. A paper from the Weisman group gives the most complete picture so far of a multiprotein complex that controls PtdIns (3, 5) P2 synthesis and explains how a VAC14 mutation functionally impairs the scaffold protein at the heart of the complex and causes a neurodegenerative condition in mice.Since phosphatidylinositol 3, 5-bisphosphate (PtdIns (3, 5) P2) was discovered a decade ago (Dove et al, 1997), it has become clear that it is a ubiquitous eukaryote phosphoinositide of very low abundance. PtdIns (3, 5) P2 probably has multiple functions—the best characterised of which is support, and probably regulation, of retrograde membrane trafficking from lysosomal and late endosomal compartments to the Golgi complex (Dove et al, 2004; Efe et al, 2005; Michell et al, 2006; Shisheva, 2008). Genetic loss or malfunction of several proteins essential to PtdIns (3, 5) P2 function is deleterious both in yeast and animals (see Jin et al (2008) for references). Only recently have the first real hints about how cellular PtdIns (3, 5) P2 levels are regulated—for example, how is synthesis stimulated by hyperosmotic shock—begun to emerge, and this is the problem addressed by this study (Jin et al, 2008).
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