Coronavirus subverts ER-phagy by hijacking FAM134B and ATL3 into p62 condensates to facilitate viral replication.

Coronavirus subverts ER-phagy by hijacking FAM134B and ATL3 into p62 condensates to facilitate viral replication.
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DOI:
10.1016/j.celrep.2023.112286
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发表时间:
2023-04-25
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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--
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ER-吞噬是一种由ER-吞噬受体介导的选择性降解内质网的自噬形式。冠状病毒已被证明使用内质网作为膜来源来建立其双膜小泡(DMV)。然而,病毒是否调节ER吞噬来驱动病毒DMV的形成及其潜在的分子机制在很大程度上仍不清楚。在这里,我们证明了冠状病毒通过劫持ER吞噬受体FAM134B和ATL3到p62凝聚体中来颠覆ER吞噬,导致病毒复制增加。从机制上讲,我们发现病毒蛋白ORF8与p62结合并与其缩合。FAM134B和ATL3与ORF8的同源二聚体相互作用,聚集成ORF8/P62液滴,导致ER-吞噬抑制。ORF8/p62凝聚体破坏ER吞噬,促进病毒DMV的形成,激活ER应激。总之,我们的数据突显了冠状病毒如何通过劫持ER吞噬受体来调节ER吞噬来驱动病毒复制。Tan等人。描述SARS-CoV-2蛋白ORF8通过劫持受体FAM134B和ATL3进入p62凝集物,促进病毒复制细胞器双膜囊泡的产生,从而抑制ER吞噬的重要机制。
ER-phagy is a form of autophagy that is mediated by ER-phagy receptors and selectively degrades endoplasmic reticulum (ER). Coronaviruses have been shown to use the ER as a membrane source to establish their double-membrane vesicles (DMVs). However, whether viruses modulate ER-phagy to drive viral DMV formation and its underlying molecular mechanisms remains largely unknown. Here, we demonstrate that coronavirus subverts ER-phagy by hijacking the ER-phagy receptors FAM134B and ATL3 into p62 condensates, resulting in increased viral replication. Mechanistically, we show that viral protein ORF8 binds to and undergoes condensation with p62. FAM134B and ATL3 interact with homodimer of ORF8 and are aggregated into ORF8/p62 liquid droplets, leading to ER-phagy inhibition. ORF8/p62 condensates disrupt ER-phagy to facilitate viral DMV formation and activate ER stress. Together, our data highlight how coronavirus modulates ER-phagy to drive viral replication by hijacking ER-phagy receptors. Tan et al. describe an important mechanism by which SARS-CoV-2 protein ORF8 inhibits ER-phagy by hijacking the receptors FAM134B and ATL3 into p62 condensates, facilitating the production of viral replication organelle double-membrane vesicles.
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