Two-site recognition of phosphatidylinositol 3-phosphate by PROPPINs in autophagy.

Two-site recognition of phosphatidylinositol 3-phosphate by PROPPINs in autophagy.
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DOI:
10.1016/j.molcel.2012.05.027
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发表时间:
2012-08-10
期刊:
影响因子:
16
通讯作者:
Hurley, James H.
Hurley, James H.
中科院分区:
生物学1区
文献类型:
--
作者:
Baskaran, Sulochanadevi;Ragusa, Michael J.;Boura, Evzen;Hurley, James H.

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巨自噬是细胞在饥饿期间生存所必需的,并且通过双膜吞噬细胞的生长而进行,该吞噬细胞吞噬胞质溶胶和其他底物。脂质磷脂酰肌醇3-磷酸(PI(3)P)的合成和识别对于自噬至关重要。关键的自噬PI(3)P传感器属于PROPPIN家族,其从酵母到人类都是保守的。在这里,我们报告的晶体结构的酵母蛋白Hsv 2。该结构由七叶片β螺旋桨组成,出乎意料的是,在叶片5和6上包含两个伪等效的PI(3)P结合位点。这两个位点都有助于体外膜结合,并共同需要在酵母中的完整自噬功能。这些位点通过叶片6中的疏水环与膜结合协同作用,解释了PROPPIN对膜结合PI(3)P的特异性。因此,这些观察结果为自噬中保守的中心分子识别事件之一提供了结构和机制框架。
Macroautophagy is essential to cell survival during starvation and proceeds by the growth of a double-membraned phagophore, which engulfs cytosol and other substrates. The synthesis and recognition of the lipid phosphatidylinositol 3-phosphate (PI(3)P) is essential for autophagy. The key autophagic PI(3)P sensors, which are conserved from yeast to humans, belong to the PROPPIN family. Here we report the crystal structure of the yeast PROPPIN Hsv2. The structure consists of a seven-bladed β-propeller, and unexpectedly, contains two pseudo-equivalent PI(3)P binding sites on blades 5 and 6. These two sites both contribute to membrane binding in vitro and are collectively required for full autophagic function in yeast. These sites function in concert with membrane binding by a hydrophobic loop in blade 6, explaining the specificity of the PROPPINs for membrane-bound PI(3)P. These observations thus provide a structural and mechanistic framework for one of the conserved central molecular recognition events in autophagy.
晶体结构和生化分析表明 Beclin 1 是一种新型膜结合蛋白
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影响因子: 11.1
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