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STAT2 Is an Essential Adaptor in USP18-mediated Suppression of Type I Interferon Signaling

STAT2 Is an Essential Adaptor in USP18-mediated Suppression of Type I Interferon Signaling

Kei-Ichiro Arimoto, Sara Löchte, Samuel A Stoner, Christoph Burkart, Yue Zhang, Sayuri Miyauchi, Stephan Wilmes, Jun-Bao Fan, Jürgen J Heinisch, Zhi Li, Ming Yan, Sandra Pellegrini, Frédéric Colland, Jacob Piehler, etc.

Nat Struct Mol Biol. 2017 Mar;24(3):279-289.

PMID: 28165510

Abstract:

Type I interferons (IFNs) are multifunctional cytokines that regulate immune responses and cellular functions but also can have detrimental effects on human health. A tight regulatory network therefore controls IFN signaling, which in turn may interfere with medical interventions. The JAK-STAT signaling pathway transmits the IFN extracellular signal to the nucleus, thus resulting in alterations in gene expression. STAT2 is a well-known essential and specific positive effector of type I IFN signaling. Here, we report that STAT2 is also a previously unrecognized, crucial component of the USP18-mediated negative-feedback control in both human and mouse cells. We found that STAT2 recruits USP18 to the type I IFN receptor subunit IFNAR2 via its constitutive membrane-distal STAT2-binding site. This mechanistic coupling of effector and negative-feedback functions of STAT2 may provide novel strategies for treatment of IFN-signaling-related human diseases.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42414950	STAT2 human			Price

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