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
中科院分区:
文献类型:
--
作者:
Menzel S;Koudelka T;Rissiek B;Haag F;Meyer-Schwesinger C;Tholey A;Koch-Nolte F
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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影响因子:
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通讯作者:
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影响因子:
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作者:
Ohlrogge, W;Haag, F;Koch-Nolte, F
通讯作者:
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