Acetylation of Beclin 1 inhibits autophagosome maturation and promotes tumour growth.

Acetylation of Beclin 1 inhibits autophagosome maturation and promotes tumour growth.
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DOI:
10.1038/ncomms8215
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发表时间:
2015-05-26
影响因子:
16.6
通讯作者:
Zhu, Xiao-Feng
Zhu, Xiao-Feng
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Sun, Ting;Li, Xuan;Zhang, Peng;Chen, Wen-Dan;Zhang, Hai-liang;Li, Dan-Dan;Deng, Rong;Qian, Xiao-Jun;Jiao, Lin;Ji, Jiao;Li, Yun-Tian;Wu, Rui-Yan;Yu, Yan;Feng, Gong-Kan;Zhu, Xiao-Feng

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Beclin 1, a protein essential for autophagy, regulates autophagy by interacting with Vps34 and other cofactors to form the Beclin 1 complex. Modifications of Beclin 1 may lead to the induction, inhibition or fine-tuning of the autophagic response under a variety of conditions. Here we show that Beclin 1 is acetylated by p300 and deacetylated by SIRT1 at lysine residues 430 and 437. In addition, the phosphorylation of Beclin 1 at S409 by CK1 is required for the subsequent p300 binding and Beclin 1 acetylation. Beclin 1 acetylation inhibits autophagosome maturation and endocytic trafficking by promoting the recruitment of Rubicon. In tumour xenografts, the expression of 2KR mutant Beclin 1 (substitution of K430 and K437 to arginines) leads to enhanced autophagosome maturation and tumour growth suppression. Therefore, our study identifies an acetylation-dependent regulatory mechanism governing Beclin 1 function in autophagosome maturation and tumour growth. Beclin 1 is an essential autophagy effector, necessary to form the autophagosome. Here Sun et al. show that Beclin 1 acetylation regulated by p300 and SIRT1 inhibits autophagosome maturation, and mutation of the acetylation sites leads to tumour growth suppression in vivo.
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