Phosphorylation of the autophagy receptor optineurin restricts Salmonella growth.

Phosphorylation of the autophagy receptor optineurin restricts Salmonella growth.
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DOI:
10.1126/science.1205405
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发表时间:
2011-07-08
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Dikic I
Dikic I
中科院分区:
其他
文献类型:
--
作者:
Wild P;Farhan H;McEwan DG;Wagner S;Rogov VV;Brady NR;Richter B;Korac J;Waidmann O;Choudhary C;Dötsch V;Bumann D;Dikic I

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选择性自噬可以通过受体分子介导,受体分子将特定的货物连接到由泛素样微管相关蛋白轻链 3 (LC3) 修饰剂修饰的自噬体膜上。尽管已经鉴定了几种自噬受体,但人们对体内控制其功能的机制知之甚少。在这项工作中,我们发现自噬受体 optineurin 的磷酸化促进了泛素包被的胞质肠沙门氏菌的选择性自噬。蛋白激酶 TANK 结合激酶 1 (TBK1) 磷酸化丝氨酸 177 上的 optineurin,增强 LC3 结合亲和力和胞质沙门氏菌的自噬清除能力。相反,泛素或 LC3 结合的 optineurin 突变体以及 optineurin 或 TBK1 的沉默会损害沙门氏菌自噬,导致细胞内细菌增殖增加。我们认为自噬受体的磷酸化可能是调节货物选择性自噬的一般机制。
Selective autophagy can be mediated via receptor molecules that link specific cargoes to the autophagosomal membranes decorated by ubiquitin-like microtubule-associated protein light chain 3 (LC3) modifiers. Although several autophagy receptors have been identified, little is known about mechanisms controlling their functions in vivo. In this work, we found that phosphorylation of an autophagy receptor, optineurin, promoted selective autophagy of ubiquitin-coated cytosolic Salmonella enterica. The protein kinase TANK binding kinase 1 (TBK1) phosphorylated optineurin on serine-177, enhancing LC3 binding affinity and autophagic clearance of cytosolic Salmonella. Conversely, ubiquitin- or LC3-binding optineurin mutants and silencing of optineurin or TBK1 impaired Salmonella autophagy, resulting in increased intracellular bacterial proliferation. We propose that phosphorylation of autophagy receptors might be a general mechanism for regulation of cargo-selective autophagy.
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