Regulation of cytokine signaling through direct interaction between cytokine receptors and the ATG16L1 WD40 domain.

Regulation of cytokine signaling through direct interaction between cytokine receptors and the ATG16L1 WD40 domain.
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通过细胞因子受体与ATG16L1 WD40结构域之间的直接相互作用来调节细胞因子信号传导。

DOI:
10.1038/s41467-020-19670-4
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发表时间:
2020-11-20
影响因子:
16.6
通讯作者:
Pimentel-Muiños FX
Pimentel-Muiños FX
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Serramito-Gómez I;Boada-Romero E;Villamuera R;Fernández-Cabrera Á;Cedillo JL;Martín-Regalado Á;Carding S;Mayer U;Powell PP;Wileman T;García-Higuera I;Pimentel-Muiños FX

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ATG16L1是一种自噬介质,它指定了LC3脂化的位置,包括一个由7个WD40型重复组成的C-末端结构域(WD40结构域,WDD),其功能尚不清楚。在这里,我们展示了WDD与细胞因子受体的胞内域相互作用,以调节它们的信号输出,以响应配体的刺激。使用之前描述的WDD结合氨基酸基序的精制版本,我们在这里证明了该元件存在于细胞因子受体的胞内区域。其中两个受体,IL-10RB和IL-2Rγ,通过基序识别WdD,并表现出依赖wdd的Lc3脂化活性。IL-10通过WDD促进IL-10RB/ATG16L1的相互作用,而在缺乏WDD的细胞中,由于IL-10/IL-10R复合体的吞噬延迟和早期转运效率低下,IL-10的信号转导不是最理想的。我们的数据揭示了ATG16L1在调节细胞因子受体运输和信号传递中依赖于WDD的作用,并提供了一个WDD结合基序,可能用于识别其他WDD激活剂。ATG16L1的WD40结构域被认为与非典型自噬有关。在这里,作者筛选了多肽文库,并确定了该结构域与IL-2Rγ和IL-10RB受体之间的相互作用,表明内体通过非规范自噬调节细胞因子信号。
ATG16L1, an autophagy mediator that specifies the site of LC3 lipidation, includes a C-terminal domain formed by 7 WD40-type repeats (WD40 domain, WDD), the function of which is unclear. Here we show that the WDD interacts with the intracellular domain of cytokine receptors to regulate their signaling output in response to ligand stimulation. Using a refined version of a previously described WDD-binding amino acid motif, here we show that this element is present in the intracellular domain of cytokine receptors. Two of these receptors, IL-10RB and IL-2Rγ, recognize the WDD through the motif and exhibit WDD-dependent LC3 lipidation activity. IL-10 promotes IL-10RB/ATG16L1 interaction through the WDD, and IL-10 signaling is suboptimal in cells lacking the WDD owing to delayed endocytosis and inefficient early trafficking of IL10/IL-10R complexes. Our data reveal WDD-dependent roles of ATG16L1 in the regulation of cytokine receptor trafficking and signaling, and provide a WDD-binding motif that might be used to identify additional WDD activators. The WD40 domain of ATG16L1 is thought to be involved in non-canonical autophagy. Here the authors screen peptide libraries and identify interactions between this domain and the IL-2Rγ and IL-10RB receptors, indicating endosomal regulation of cytokine signalling by non-canonical autophagy.
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