Ubiquitylation of autophagy receptor Optineurin by HACE1 activates selective autophagy for tumor suppression.

Ubiquitylation of autophagy receptor Optineurin by HACE1 activates selective autophagy for tumor suppression.
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DOI:
10.1016/j.ccr.2014.05.015
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发表时间:
2014-07-14
期刊:
影响因子:
50.3
通讯作者:
Hu R
Hu R
中科院分区:
医学1区
文献类型:
--
作者:
Liu Z;Chen P;Gao H;Gu Y;Yang J;Peng H;Xu X;Wang H;Yang M;Liu X;Fan L;Chen S;Zhou J;Sun Y;Ruan K;Cheng S;Komatsu M;White E;Li L;Ji H;Finley D;Hu R

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在选择性自噬中,受体是货物选择和递送的中心。然而,目前尚不清楚是否以及如何多个自噬受体可能形成复杂的功能协调控制自噬。视神经磷酸酶(OPTN)是最近发现的一种自噬受体,在青光眼和肌萎缩侧索硬化症中具有遗传学意义。在这里,我们报告了肿瘤抑制因子HACE 1,一种泛素连接酶,使OPTN泛素化,并促进其与p62/SQSTM 1相互作用形成自噬受体复合物,从而加速自噬通量。有趣的是,K48-连接的多聚泛素链,HACE 1共轭到OPTN上可能主要靶向OPTN进行自噬降解。通过证明HACE 1-OPTN轴协同抑制肺癌细胞的生长和致瘤性,我们的研究结果可能为开发自噬靶向治疗干预癌症开辟了一条途径。
In selective autophagy, receptors are central for cargo selection and delivery. However, it remains yet unclear whether and how multiple autophagy receptors might form complex and function concertedly to control autophagy. Optineurin (OPTN), implicated genetically in glaucoma and amyotrophic lateral sclerosis, was a recently identified autophagy receptor. Here we report that tumor suppressor HACE1, a ubiquitin ligase, ubiquitylates OPTN and promotes its interaction with p62/SQSTM1 to form the autophagy receptor complex, thus accelerating autophagic flux. Interestingly, the K48-linked polyubiquitin chains that HACE1 conjugates onto OPTN might predominantly target OPTN for autophagic degradation. By demonstrating that the HACE1-OPTN axis synergistically suppresses growth and tumorigenicity of lung cancer cells, our findings may open an avenue for developing autophagy-targeted therapeutic intervention into cancer.
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