FIP200 controls the TBK1 activation threshold at SQSTM1/p62-positive condensates.

FIP200 controls the TBK1 activation threshold at SQSTM1/p62-positive condensates.
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FIP 200控制SQSTM 1/p62阳性缩合物的TBK 1激活阈值。

DOI:
10.1038/s41598-021-92408-4
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发表时间:
2021-07-05
期刊:
影响因子:
4.6
通讯作者:
Stork B
Stork B
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Schlütermann D;Berleth N;Deitersen J;Wallot-Hieke N;Friesen O;Wu W;Stuhldreier F;Sun Y;Berning L;Friedrich A;Mendiburo MJ;Peter C;Wiek C;Hanenberg H;Stefanski A;Stühler K;Stork B

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蛋白激酶TBK 1是先天性免疫应答和自噬的中心调节因子,并且任一功能的消除与神经炎症或退行性疾病有关。自噬是一种细胞内的过程,它使旧的或受损的蛋白质和细胞器再生。近年来,TBK 1依赖的自噬途径的调节已经被表征。然而,TBK 1活性的自噬依赖性调节有待进一步澄清。在这里,我们观察到TBK 1通过选择性自噬受体TAX 1BP 1被募集到含有SQSTM 1/p62的聚集体中。在这些聚集体中,TBK 1在丝氨酸403处磷酸化SQSTM 1/p62,从而推测调节这些结构的有效吞噬和清除。我们发现,如果FIP 200(诱导自噬的ULK 1复合物的一种成分)不存在或不能与TAX 1BP 1结合,TBK 1的活化会强烈增加。鉴于我们的集体研究结果,我们假设FIP 200确保了TBK 1在SQSTM 1/p62缩合物上的诱导活化。
The protein kinase TBK1 is a central regulator of innate immune responses and autophagy, and ablation of either function has been linked to neuroinflammatory or degenerative diseases. Autophagy is an intracellular process that recycles old or damaged proteins and organelles. In recent years, the TBK1-dependent regulation of autophagy pathways has been characterized. However, the autophagy-dependent regulation of TBK1 activity awaits further clarification. Here, we observed that TBK1 is recruited to SQSTM1/p62-containing aggregates via the selective autophagy receptor TAX1BP1. In these aggregates, TBK1 phosphorylates SQSTM1/p62 at serine 403 and thus presumably regulates the efficient engulfment and clearance of these structures. We found that TBK1 activation is strongly increased if FIP200, a component of the autophagy-inducing ULK1 complex, is not present or cannot bind to TAX1BP1. Given our collective findings, we hypothesize that FIP200 ensures the inducible activation of TBK1 at SQSTM1/p62 condensates.
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