RAB37 interacts directly with ATG5 and promotes autophagosome formation via regulating ATG5-12-16 complex assembly.

RAB37 interacts directly with ATG5 and promotes autophagosome formation via regulating ATG5-12-16 complex assembly.
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RAB37 直接与 ATG5 相互作用,并通过调节 ATG5-12-16 复合物组装促进自噬体形成

DOI:
10.1038/s41418-017-0023-1
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发表时间:
2018-05
影响因子:
12.4
通讯作者:
Zhou R
Zhou R
中科院分区:
生物学1区
文献类型:
--
作者:
Sheng Y;Song Y;Li Z;Wang Y;Lin H;Cheng H;Zhou R

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细胞内膜运输是真核细胞生存所必需的。在这里,我们表明通过GTP结合的RAB 37激活募集ATG 5 -12到隔离膜,并通过ATG 5-ATG 12-ATG 16 L1复合物促进自噬体形成。RAB 37定位在隔离膜上。它可以直接与ATG 5结合并促进ATG 5 -12-16复合物的形成。突变分析表明,GTP结合的RAB 37表现出增强的相互作用与ATG 5 -12和GDP稳定的突变损害的相互作用。RAB 37促进ATG 5 -12与ATG 16 L1的相互作用,从而以GTP依赖性方式促进LC 3B的脂化以增强自噬。值得注意的是,RAB 37表达的消除影响复合物的形成并减少自噬,而强迫RAB 37表达促进自噬并抑制细胞增殖。我们的研究结果表明,RAB 37在自噬体形成中的作用,通过分子连接的RAB 37,ATG 5 -12,ATG 16 L1至LC 3B,这表明在自噬体膜生物发生过程中的组织者作用的RAB 37。这些发现对于理解RAB囊泡转运在自噬和癌症中的作用具有广泛的意义。
Intracellular membrane trafficking is essential for eukaryotic cell existence. Here, we show that RAB37 activation through GTP binding recruits ATG5-12 to isolation membrane and promotes autophagosome formation through the ATG5-ATG12-ATG16L1 complex. RAB37 is localized on the isolation membrane. It can bind directly with ATG5 and promotes formation of the ATG5-12-16 complex. Mutation analysis reveals that GTP-bound RAB37 exhibits an enhanced interaction with ATG5-12 and GDP-stabilised mutation impairs the interaction. RAB37 promotes ATG5-12 interaction with ATG16L1, thus facilitates lipidation of LC3B in a GTP-dependent manner to enhance autophagy. Notably, ablation of RAB37 expression affects the complex formation and decreases autophagy, whereas forced RAB37 expression promotes autophagy and also suppresses cell proliferation. Our results demonstrate a role of RAB37 in autophagosome formation through a molecular connection of RAB37, ATG5-12, ATG16L1 up to LC3B, suggesting an organiser role of RAB37 during autophagosomal membrane biogenesis. These findings have broad implications for understanding the role of RAB vesicle transport in autophagy and cancer.
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