The selective macroautophagic degradation of aggregated proteins requires the PI3P-binding protein Alfy.

The selective macroautophagic degradation of aggregated proteins requires the PI3P-binding protein Alfy.
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DOI:
10.1016/j.molcel.2010.04.007
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发表时间:
2010-04-23
期刊:
影响因子:
16
通讯作者:
Yamamoto A
Yamamoto A
中科院分区:
生物学1区
文献类型:
--
作者:
Filimonenko M;Isakson P;Finley KD;Anderson M;Jeong H;Melia TJ;Bartlett BJ;Myers KM;Birkeland HC;Lamark T;Krainc D;Brech A;Stenmark H;Simonsen A;Yamamoto A

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越来越多的证据表明,巨自噬货物不限于散装细胞质响应饥饿,并可以发生选择性的底物,包括聚集蛋白。然而,目前尚不清楚饥饿诱导的和选择性的大自噬是否共享相同的适配器分子来捕获它们的货物。在这里,我们报告说,Alfy,磷脂酰肌醇3-磷酸结合蛋白,是中央的选择性消除聚集蛋白。我们报告说,Alfy的损失抑制夹杂物的清除,对饥饿反应几乎没有影响。Alfy被募集到细胞内包涵体中,并在p62(SQSTM 1)阳性蛋白与自噬效应子Atg 5、Atg 12、Atg 16 L和LC 3之间构建复合物。Alfy过表达导致以Atg 5依赖性方式消除聚集体,并且同样地,在多聚谷氨酰胺毒性的神经元和果蝇模型中保护。我们认为,Alfy在选择性大自噬中起着关键作用,通过将货物连接到构建自噬体的分子机制。
There is growing evidence that macroautophagic cargo is not limited to bulk cytosol in response to starvation, and can occur selectively for substrates including aggregated proteins. It remains unclear, however, if starvation-induced and selective macroautophagy share identical adapter molecules to capture their cargo. Here we report that Alfy, a phosphatidylinositol 3-phosphate binding protein, is central to the selective elimination of aggregated proteins. We report that the loss of Alfy inhibits the clearance of inclusions, with little to no effect on the starvation response. Alfy is recruited to intracellular inclusions and scaffolds a complex between p62(SQSTM1)-positive proteins and the autophagic effectors Atg5, Atg12, Atg16L and LC3. Alfy overexpression leads to elimination of aggregates in an Atg5-dependent manner, and likewise, to protection in a neuronal and Drosophila model of polyglutamine toxicity. We propose that Alfy plays a key role in selective macroautophagy, by bridging cargo to the molecular machinery that builds autophagosomes.
DOI: 10.1083/jcb.143.7.1883
发表时间: 1998-12-28
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