A regulatory circuit comprising the CBP and SIRT7 regulates FAM134B-mediated ER-phagy.

A regulatory circuit comprising the CBP and SIRT7 regulates FAM134B-mediated ER-phagy.
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由CBP和SIRT7组成的调节电路调节FAM134B介导的ER-PHAGY。

DOI:
10.1083/jcb.202201068
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发表时间:
2023-05-01
期刊:
The Journal of cell biology
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其他
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Wang等人报道,核衍生的CBP和SIRT 7构成启动ER-吞噬作为对ER应激的早期反应的调节回路。接下来,他们提出了一个连续乙酰化-磷酸化的模型来描述ER-吞噬受体如何整合不同的信号来时空控制ER稳态。自噬是利用一系列受体特异性地识别和降解自噬货物,包括受损的细胞器,以维持细胞内稳态。上游信号通过蛋白质翻译后修饰(PTM)如磷酸化在时空上调节选择性自噬受体的生物学功能。然而,目前还不清楚乙酰化如何直接控制选择性自噬中的自噬受体。在这里,我们报告说,ER-吞噬受体FAM 134 B是由CBP乙酰转移酶乙酰化,引发激烈的ER-吞噬。此外,FAM 134 B乙酰化促进CAMKII介导的磷酸化以维持较温和的ER-吞噬模式。相反,SIRT 7使FAM 134 B脱乙酰化以缓和其在ER-吞噬中的活性,从而避免过度的ER降解。总之,这项工作提供了进一步的机制的见解ER-吞噬受体如何感知环境信号的ER稳态的微调,并演示了如何编程核衍生因子通过调节ER-吞噬来控制ER应激。
Wang et al. report that nucleus-derived CBP and SIRT7 constitute a regulatory circuit to initiate ER-phagy as an early response to ER stress. Next, they presented a model of sequential acetylation-phosphorylation to depict how ER-phagy receptor integrates divergent signals for spatiotemporal control of ER homeostasis. Macroautophagy (autophagy) utilizes a serial of receptors to specifically recognize and degrade autophagy cargoes, including damaged organelles, to maintain cellular homeostasis. Upstream signals spatiotemporally regulate the biological functions of selective autophagy receptors through protein post-translational modifications (PTM) such as phosphorylation. However, it is unclear how acetylation directly controls autophagy receptors in selective autophagy. Here, we report that an ER-phagy receptor FAM134B is acetylated by CBP acetyltransferase, eliciting intense ER-phagy. Furthermore, FAM134B acetylation promoted CAMKII-mediated phosphorylation to sustain a mode of milder ER-phagy. Conversely, SIRT7 deacetylated FAM134B to temper its activities in ER-phagy to avoid excessive ER degradation. Together, this work provides further mechanistic insights into how ER-phagy receptor perceives environmental signals for fine-tuning of ER homeostasis and demonstrates how nucleus-derived factors are programmed to control ER stress by modulating ER-phagy.
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