ADP-Ribosylation Regulates the Signaling Function of IFN-γ.

ADP-Ribosylation Regulates the Signaling Function of IFN-γ.
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DOI:
10.3389/fimmu.2021.642545
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发表时间:
2021
影响因子:
7.3
通讯作者:
Koch-Nolte F
Koch-Nolte F
中科院分区:
医学2区
文献类型:
--
作者:
Menzel S;Koudelka T;Rissiek B;Haag F;Meyer-Schwesinger C;Tholey A;Koch-Nolte F

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鼠T细胞在细胞表面表达GPI锚定的ADP-核糖基转移酶2.2(ARTC2.2)。响应于T细胞活化或细胞外NAD+或ATP介导的P2 X7离子通道门控,ARTC2.2作为可溶性酶从细胞表面脱落。脱落改变了ARTC2.2从细胞表面蛋白到分泌蛋白的靶特异性。在这里,我们证明了脱落的ARTC2.2除了其他细胞因子之外还有效地使IFN-γ ADP-核糖基化。使用质谱,我们确定精氨酸128作为ADP-核糖基化的靶位点。该残基在IFN-γ与干扰素受体1(IFNR 1)的结合中起关键作用。事实上,IFN-γ与IFNR 1的结合阻断了IFN-γ的ADP-核糖基化。此外,IFN-γ的ADP-核糖基化抑制IFN-γ诱导巨噬细胞中STAT 1磷酸化的能力以及足细胞中蛋白酶体亚基β 5 i和蛋白酶体激活剂PA 28-α的上调。我们的研究结果表明,ADP-核糖基化抑制IFN-γ的信号功能,并指出一个新的调节机制,控制IFN-γ的信号。
Murine T cells express the GPI-anchored ADP-ribosyltransferase 2.2 (ARTC2.2) on the cell surface. In response to T cell activation or extracellular NAD+ or ATP-mediated gating of the P2X7 ion channel ARTC2.2 is shed from the cell surface as a soluble enzyme. Shedding alters the target specificity of ARTC2.2 from cell surface proteins to secreted proteins. Here we demonstrate that shed ARTC2.2 potently ADP-ribosylates IFN-γ in addition to other cytokines. Using mass spectrometry, we identify arginine 128 as the target site of ADP-ribosylation. This residue has been implicated to play a key role in binding of IFN-γ to the interferon receptor 1 (IFNR1). Indeed, binding of IFN-γ to IFNR1 blocks ADP-ribosylation of IFN-γ. Moreover, ADP-ribosylation of IFN-γ inhibits the capacity of IFN-γ to induce STAT1 phosphorylation in macrophages and upregulation of the proteasomal subunit ß5i and the proteasomal activator PA28-α in podocytes. Our results show that ADP-ribosylation inhibits the signaling functions of IFN-γ and point to a new regulatory mechanism for controlling signaling by IFN-γ.
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