SIKE is an IKK Epsilon/TBK1-associated Suppressor of TLR3- and Virus-triggered IRF-3 Activation Pathways

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2005 Nov 11

PMID 16281057

Citations 68

Authors

Jun Huang

Ting Liu

Liang-Guo Xu

Danying Chen

Zhonghe Zhai

Hong-Bing Shu

Affiliations

Soon will be listed here.

Abstract

Viral infection or TLR3 engagement causes activation of the transcription factors IRF-3 and NF-kappaB, which collaborate to induce transcription of type I IFN genes. IKKepsilon and TBK1 are two IKK-related kinases critically involved in virus- and TLR3-triggered activation of IRF-3. We identified a protein termed SIKE (for Suppressor of IKKepsilon) that interacts with IKKepsilon and TBK1. SIKE is associated with TBK1 under physiological condition and dissociated from TBK1 upon viral infection or TLR3 stimulation. Overexpression of SIKE disrupted the interactions of IKKepsilon or TBK1 with TRIF, RIG-I and IRF-3, components in virus- and TLR3-triggered IRF-3 activation pathways, but did not disrupt the interactions of TRIF with TRAF6 and RIP, components in TLR3-triggered NF-kappaB activation pathway. Consistently, overexpression of SIKE inhibited virus- and TLR3-triggered interferon-stimulated response elements (ISRE) but not NF-kappaB activation. Knockdown of SIKE potentiated virus- and TLR3-triggered ISRE but not NF-kappaB activation. Moreover, overexpression of SIKE inhibited IKKepsilon- and TBK1-mediated antiviral response. These findings suggest that SIKE is a physiological suppressor of IKKepsilon and TBK1 and plays an inhibitory role in virus- and TLR3-triggered IRF-3 but not NF-kappaB activation pathways.

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