Deacetylation of ATG4B promotes autophagy initiation under starvation.

Deacetylation of ATG4B promotes autophagy initiation under starvation.
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ATG4B 去乙酰化促进饥饿条件下自噬的启动

DOI:
10.1126/sciadv.abo0412
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发表时间:
2022-08-05
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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真核生物在面临缺乏外部营养等环境变化时,会启动自噬。然而,自噬的启动机制仍未完全阐明。在这里,我们表明ATG4B的脱乙酰基在饥饿诱导的自噬启动中起着关键作用。具体地说,我们证明了ATG4B在饥饿期间通过K39处的脱乙酰酶SIRT2被激活。此外,饥饿以细胞周期蛋白E/CDK2抑制依赖的方式触发SIRT2去磷酸化和激活。同时,饥饿下调p300,导致K39处ATG4B乙酰化减少。K39脱乙酰基还能增强ATG4B与原LC3的相互作用,从而促进LC3-II的形成。此外,使用SIRT2基因敲除小鼠的体内实验也证实了SIRT2介导的K39位ATG4B去乙酰化促进了饥饿诱导的自噬启动。综上所述,这项研究揭示了一种乙酰化依赖的调节机制,该机制控制ATG4B在自噬启动中的作用,以响应营养缺乏。
Eukaryotes initiate autophagy when facing environmental changes such as a lack of external nutrients. However, the mechanisms of autophagy initiation are still not fully elucidated. Here, we showed that deacetylation of ATG4B plays a key role in starvation-induced autophagy initiation. Specifically, we demonstrated that ATG4B is activated during starvation through deacetylation at K39 by the deacetylase SIRT2. Moreover, starvation triggers SIRT2 dephosphorylation and activation in a cyclin E/CDK2 suppression–dependent manner. Meanwhile, starvation down-regulates p300, leading to a decrease in ATG4B acetylation at K39. K39 deacetylation also enhances the interaction of ATG4B with pro-LC3, which promotes LC3-II formation. Furthermore, an in vivo experiment using Sirt2 knockout mice also confirmed that SIRT2-mediated ATG4B deacetylation at K39 promotes starvation-induced autophagy initiation. In summary, this study reveals an acetylation-dependent regulatory mechanism that controls the role of ATG4B in autophagy initiation in response to nutritional deficiency.
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