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Immunity. 2010 Nov 24;33(5):765-76. doi: 10.1016/j.immuni.2010.10.013. Epub 2010 Nov 11.

The ubiquitin ligase TRIM56 regulates innate immune responses to intracellular double-stranded DNA.

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  • 1Laboratory of Host Defense, WPI Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan.

Abstract

The innate immune system detects pathogen- and host-derived double-stranded DNA exposed to the cytosol and induces type I interferon (IFN) and other cytokines. Here, we identified interferon-inducible tripartite-motif (TRIM) 56 as a regulator of double-stranded DNA-mediated type I interferon induction. TRIM56 overexpression enhanced IFN-β promoter activation after double-stranded DNA stimulation whereas TRIM56 knockdown abrogated it. TRIM56 interacted with STING and targeted it for lysine 63-linked ubiquitination. This modification induced STING dimerization, which was a prerequisite for recruitment of the antiviral kinase TBK1 and subsequent induction of IFN-β. Taken together, these results indicate that TRIM56 is an interferon-inducible E3 ubiquitin ligase that modulates STING to confer double-stranded DNA-mediated innate immune responses.

Copyright © 2010 Elsevier Inc. All rights reserved.

PMID:
21074459
[PubMed - indexed for MEDLINE]
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