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Functionally Distinct Effects of the C-Terminal Regions of IKKε and TBK1 on Type I IFN Production
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Functionally Distinct Effects of the C-Terminal Regions of IKKε and TBK1 on Type I IFN Production
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Journal Article
Functionally Distinct Effects of the C-Terminal Regions of IKKε and TBK1 on Type I IFN Production
2014
Overview
Inhibitor of κB kinase ε (IKKε) and TANK binding kinase 1 (TBK1), so-called non-canonical IKKs or IKK-related kinases, are involved in the cellular innate immunity by inducing type I IFNs. Two kinases commonly phosphorylate transcription factors IRF3 and IRF7 in type I IFN production pathway. In contrast to TBK1, underlying mechanisms of IKKε activation and regions required for activation of downstream molecules are poorly understood. In this study, we investigated regions of IKKε required for the activation of type I IFN promoter specially, by focusing on the C-terminal region. To show the functional significance of the IKKε C-terminal region on type I IFN production, we employed various mutant forms of IKKε and compared to corresponding region of TBK1. We identified the specific regions and residues of IKKε involved in the activation of downstream signaling. Interestingly, corresponding region and residues are not required for activation of downstream signaling by TBK1. The results highlight the importance of the C-terminal region in the functional activity of IKKε in innate immune response and also the difference in activation mechanisms between IKKε and the closely related TBK1.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Humans
/ I-kappa B Kinase - metabolism
/ Immunity
/ Interferon regulatory factor 3
/ Interferon regulatory factor 7
/ Interferon Type I - genetics
/ Interferon Type I - metabolism
/ Kinases
/ Mice
/ Plasmids
/ Protein-Serine-Threonine Kinases - genetics
/ Protein-Serine-Threonine Kinases - metabolism
/ Residues
/ Rodents
/ Signal Transduction - physiology
/ Studies
/ Virology
