Atg4 proteolytic activity can be inhibited by Atg1 phosphorylation.

Atg4 proteolytic activity can be inhibited by Atg1 phosphorylation.
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DOI:
10.1038/s41467-017-00302-3
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发表时间:
2017-08-18
影响因子:
16.6
通讯作者:
Reggiori F
Reggiori F
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Sánchez-Wandelmer J;Kriegenburg F;Rohringer S;Schuschnig M;Gómez-Sánchez R;Zens B;Abreu S;Hardenberg R;Hollenstein D;Gao J;Ungermann C;Martens S;Kraft C;Reggiori F

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自噬小体的生物发生依赖于类ATG8蛋白与磷脂酰乙醇胺的结合。ATG8需要半胱氨酸蛋白酶Atg4的处理才能与磷脂酰乙醇胺共价连接,但也需要Atg8从这种脂类中去结合才能将其从膜上释放出来。这两个切割步骤是如何协调的尚不清楚。在这里,我们证明了ATG1的磷酸化抑制了ATG4的功能,这一事件似乎只发生在自噬小体生物发生的位置。这些结果与一个模型一致,该模型认为,自噬体内形成所必需的Atg8-磷脂酰乙醇胺池至少部分受到Atg1的Atg4磷酸化的保护,而新合成的细胞质Atg8仍然容易受到结构性Atg4处理的影响。蛋白水解酶Atg4介导了自噬小体生物发生所需的Atg8脂化反应,但也触发了膜上的Atg8释放,但这些步骤是如何协调的尚不清楚。在这里,作者表明,ATG1的磷酸化抑制了自噬小体形成部位的ATG4。
The biogenesis of autophagosomes depends on the conjugation of Atg8-like proteins with phosphatidylethanolamine. Atg8 processing by the cysteine protease Atg4 is required for its covalent linkage to phosphatidylethanolamine, but it is also necessary for Atg8 deconjugation from this lipid to release it from membranes. How these two cleavage steps are coordinated is unknown. Here we show that phosphorylation by Atg1 inhibits Atg4 function, an event that appears to exclusively occur at the site of autophagosome biogenesis. These results are consistent with a model where the Atg8-phosphatidylethanolamine pool essential for autophagosome formation is protected at least in part by Atg4 phosphorylation by Atg1 while newly synthesized cytoplasmic Atg8 remains susceptible to constitutive Atg4 processing. The protease Atg4 mediates Atg8 lipidation, required for autophagosome biogenesis, but also triggers Atg8 release from the membranes, however is unclear how these steps are coordinated. Here the authors show that phosphorylation by Atg1 inhibits Atg4 at autophagosome formation sites.
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影响因子: 16.6
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