A new type of ERGIC-ERES membrane contact mediated by TMED9 and SEC12 is required for autophagosome biogenesis.

A new type of ERGIC-ERES membrane contact mediated by TMED9 and SEC12 is required for autophagosome biogenesis.
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自噬体生物发生需要一种由 TMED9 和 SEC12 介导的新型 ERGIC-ERES 膜接触

DOI:
10.1038/s41422-021-00563-0
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发表时间:
2022-03
期刊:
影响因子:
44.1
通讯作者:
Ge L
Ge L
中科院分区:
生物学1区
文献类型:
--
作者:
Li S;Yan R;Xu J;Zhao S;Ma X;Sun Q;Zhang M;Li Y;Liu JG;Chen L;Li S;Xu K;Ge L

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在应激下,内膜系统经历重组以支持自噬体生物合成,这是自噬的中心步骤。内膜系统如何重塑一直知之甚少。在这里,我们确定了一种新型的膜接触之间形成的ER-高尔基体中间室(ERGIC)和ER-出口网站(ERES)的ER-高尔基体系统,这是必不可少的促进自噬体的生物合成诱导不同的压力刺激。ERGIC-ERES接触是通过TMED 9和SEC 12之间的相互作用建立的,这在两个隔室之间产生了短距离的相对(近至2-5 nm)。紧密的膜接触允许位于ERES的SEC 12反式激活ERGIC上的COPII组装。此外,SEC 12的一部分也重新定位到ERGIC。通过这两种机制,ERGIC-ERES接触促进ERGIC衍生的COPII囊泡(自噬体的膜前体)的形成。ERGIC-ERES接触在物理上和功能上不同于参与分泌蛋白转运的TFG介导的ERGIC-ERES附着,因此定义了在应激条件下产生的独特内膜结构,用于自噬膜形成。
Under stress, the endomembrane system undergoes reorganization to support autophagosome biogenesis, which is a central step in autophagy. How the endomembrane system remodels has been poorly understood. Here we identify a new type of membrane contact formed between the ER–Golgi intermediate compartment (ERGIC) and the ER-exit site (ERES) in the ER–Golgi system, which is essential for promoting autophagosome biogenesis induced by different stress stimuli. The ERGIC–ERES contact is established by the interaction between TMED9 and SEC12 which generates a short distance opposition (as close as 2–5 nm) between the two compartments. The tight membrane contact allows the ERES-located SEC12 to transactivate COPII assembly on the ERGIC. In addition, a portion of SEC12 also relocates to the ERGIC. Through both mechanisms, the ERGIC–ERES contact promotes formation of the ERGIC-derived COPII vesicle, a membrane precursor of the autophagosome. The ERGIC–ERES contact is physically and functionally different from the TFG-mediated ERGIC–ERES adjunction involved in secretory protein transport, and therefore defines a unique endomembrane structure generated upon stress conditions for autophagic membrane formation.
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