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ZAPS is a potent stimulator of signaling mediated by the RNA helicase RIG-I during antiviral responses.

Hayakawa S., Shiratori S., Yamato H., Kameyama T., Kitatsuji C., Kashigi F., Goto S., Kameoka S., Fujikura D., Yamada T., Mizutani T., Kazumata M., Sato M., Tanaka J., Asaka M., Ohba Y., Miyazaki T., Imamura M., Takaoka A.

The poly(ADP-ribose) polymerases (PARPs) participate in many biological and pathological processes. Here we report that the PARP-13 shorter isoform (ZAPS), rather than the full-length protein (ZAP), was selectively induced by 5'-triphosphate-modified RNA (3pRNA) and functioned as a potent stimulator of interferon responses in human cells mediated by the RNA helicase RIG-I. ZAPS associated with RIG-I to promote the oligomerization and ATPase activity of RIG-I, which led to robust activation of IRF3 and NF-κB transcription factors. Disruption of the gene encoding ZAPS resulted in impaired induction of interferon-α (IFN-α), IFN-β and other cytokines after viral infection. These results indicate that ZAPS is a key regulator of RIG-I signaling during the innate antiviral immune response, which suggests its possible use as a therapeutic target for viral control.

Nat. Immunol. 12:37-44(2011) [PubMed] [Europe PMC]

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