TANK-binding kinase 1

TBK1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 4EFO, 4EUT, 4EUU, 4IM0, 4IM2, 4IM3, 4IW0, 4IWO, 4IWP, 4IWQ
Identifiers
Aliases	TBK1, Tbk1, 1200008B05Rik, AI462036, AW048562, NAK, T2K, FTDALS4, TANK binding kinase 1, IIAE8
External IDs	OMIM: 604834; MGI: 1929658; HomoloGene: 22742; GeneCards: TBK1; OMA:TBK1 - orthologs
Gene location (Human) Chr. Chromosome 12 (human) Band 12q14.2 Start 64,452,090 bp End 64,502,114 bp
Gene location (Mouse) Chr. Chromosome 10 (mouse) Band 10|10 D2 Start 121,382,360 bp End 121,422,692 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in epithelium of colon Achilles tendon lateral nuclear group of thalamus secondary oocyte sperm monocyte sural nerve ventricular zone tonsil bone marrow cells Top expressed in Paneth cell facial motor nucleus condyle Epithelium of choroid plexus fossa substantia nigra conjunctival fornix iris stroma of bone marrow vestibular membrane of cochlear duct More reference expression data BioGPS More reference expression data
Gene ontology Molecular function transferase activity nucleotide binding kinase activity protein serine/threonine kinase activity phosphoprotein binding protein binding nucleic acid binding ATP binding protein kinase activity identical protein binding protein phosphatase binding Cellular component cytoplasm cytosol endosome membrane nucleoplasm aggresome Biological process phosphorylation positive regulation of interferon-alpha production immune system process response to virus positive regulation of xenophagy negative regulation of gene expression positive regulation of peptidyl-serine phosphorylation TRIF-dependent toll-like receptor signaling pathway type I interferon production defense response to virus peptidyl-serine phosphorylation regulation of neuron death activation of innate immune response positive regulation of I-kappaB kinase/NF-kappaB signaling negative regulation of type I interferon production innate immune response viral process inflammatory response I-kappaB kinase/NF-kappaB signaling positive regulation of type I interferon production positive regulation of transcription by RNA polymerase II dendritic cell proliferation defense response to Gram-positive bacterium positive regulation of interferon-beta production regulation of type I interferon production positive regulation of macroautophagy peptidyl-threonine phosphorylation protein phosphorylation cellular response to cytokine stimulus regulation of gene expression regulation of cellular metabolic process positive regulation of type I interferon-mediated signaling pathway Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 29110 56480 Ensembl ENSG00000183735 ENSMUSG00000020115 UniProt Q9UHD2 Q9WUN2 RefSeq (mRNA) NM_013254 NM_019786 RefSeq (protein) NP_037386 NP_062760 Location (UCSC) Chr 12: 64.45 – 64.5 Mb Chr 10: 121.38 – 121.42 Mb PubMed search
Wikidata
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TBK1 (TANK-binding kinase 1) is an enzyme with kinase activity. Specifically, it is a serine / threonine protein kinase. It is encoded by the TBK1 gene in humans. This kinase is mainly known for its role in innate immunity antiviral response. However, TBK1 also regulates cell proliferation, apoptosis, autophagy, and anti-tumor immunity. Insufficient regulation of TBK1 activity leads to autoimmune, neurodegenerative diseases or tumorigenesis.

Structure and regulation of activity

TBK1 is a non-canonical IKK kinase that phosphorylates the nuclear factor kB (NFkB). It shares sequence homology with canonical IKK.

The N-terminus of the protein contains the kinase domain (region 9-309) and the ubiquitin-like domain (region 310-385). The C-terminus is formed by two coiled-coil structures (region 407-713) that provide a surface for homodimerization.

The autophosphorylation of serine 172, which requires homodimerization and ubiquitinylation of lysines 30 and 401, is necessary for kinase activity.

Involvement in signaling pathways

TBK1 is involved in many signaling pathways and forms a node between them. For this reason, regulation of its involvement in individual signaling pathways is necessary. This is provided by adaptor proteins that interact with the dimerization domain of TBK1 to determine its location and access to substrates. Binding to TANK leads to localization to the perinuclear region and phosphorylation of substrates which is required for subsequent production of type I interferons (IFN-I). In contrast, binding to NAP1 and SINTBAD leads to localization in the cytoplasm and involvement in autophagy. Another adaptor protein that determines the location of TBK1 is TAPE. TAPE targets TBK1 to endolysosomes.

A key interest in TBK1 is due to its role in innate immunity, especially in antiviral responses. TBK1 is redundant with IKK$\epsilon$, but TBK1 seems to play a more important role. After triggering antiviral signaling through PRRs (pattern recognition receptors), TBK1 is activated. Subsequently, it phosphorylates the transcription factor IRF3, which is translocated to the nucleus, and promotes production of IFN-I.

As a non-canonical IκB kinases (IKK), TBK1 is also involved in the non-canonical NF-κB pathway. It phosphorylates p100/NF-κB2, which is subsequently processed in the proteasome and released as a p52 subunit. This subunit dimerizes with RelB and mediates gene expression.

In the canonical NF-κB pathway, the NF-kappa-B (NF-κB) complex of proteins is inhibited by I-kappa-B (IκB) proteins, which inactivate NF-κB by trapping it in the cytoplasm. Phosphorylation of serine residues on the IκB proteins by IκB kinases (IKK) marks them for destruction via the ubiquitination pathway, thereby allowing activation and nuclear translocation of the NF-κB complex. The protein encoded by this gene is similar to IκB kinases and can mediate NF-κB activation in response to certain growth factors.

TBK1 promotes autophagy involved in pathogen and mitochondrial clearance. TBK1 phosphorylates autophagy receptors and components of the autophagy apparatus. Furthermore, TBK1 is also involved in the regulation of cell proliferation, apoptosis and glucose metabolism.

Interactions

TANK-binding kinase 1 has been shown to interact with:

• NCK1,
• TANK,
• TRAF2 and
• TBKBP1 aka SINTBAD

Transcription factors activated upon TBK1 activation include IRF3, IRF7 and ZEB1.

Clinical significance

Deregulation of TBK1 activity and mutations in this protein are associated with many diseases. Due to the role of TBK1 in cell survival, deregulation of its activity is associated with tumorogenesis. There are also many autoimmune (e.g., rheumatoid arthritis, sympathetic lupus), neurodegenerative (e.g., amyotrophic lateral sclerosis), and infantile (e.g., herpesviral encephalitis) diseases.

The loss of TBK1 cause embryonic lethality in mice.

Inhibition of IκB kinase (IKK) and IKK-related kinases, IKBKE (IKKε) and TANK-binding kinase 1 (TBK1), has been investigated as a therapeutic option for the treatment of inflammatory diseases and cancer, and a way to overcome resistance to cancer immunotherapy.

See also

• CGAS–STING cytosolic DNA sensing pathway

Further reading

• Chou MM, Hanafusa H (March 1995). "A novel ligand for SH3 domains. The Nck adaptor protein binds to a serine/threonine kinase via an SH3 domain". The Journal of Biological Chemistry. 270 (13): 7359–7364. doi:10.1074/jbc.270.13.7359. PMID 7706279.
• Chen ZJ, Parent L, Maniatis T (March 1996). "Site-specific phosphorylation of IkappaBalpha by a novel ubiquitination-dependent protein kinase activity". Cell. 84 (6): 853–862. doi:10.1016/S0092-8674(00)81064-8. PMID 8601309. S2CID 112412.
• Zandi E, Chen Y, Karin M (August 1998). "Direct phosphorylation of IkappaB by IKKalpha and IKKbeta: discrimination between free and NF-kappaB-bound substrate". Science. 281 (5381): 1360–1363. doi:10.1126/science.281.5381.1360. PMID 9721103.
• Bonnard M, Mirtsos C, Suzuki S, Graham K, Huang J, Ng M, et al. (September 2000). "Deficiency of T2K leads to apoptotic liver degeneration and impaired NF-kappaB-dependent gene transcription". The EMBO Journal. 19 (18): 4976–4985. doi:10.1093/emboj/19.18.4976. PMC 314216. PMID 10990461.
• Kishore N, Huynh QK, Mathialagan S, Hall T, Rouw S, Creely D, et al. (April 2002). "IKK-i and TBK-1 are enzymatically distinct from the homologous enzyme IKK-2: comparative analysis of recombinant human IKK-i, TBK-1, and IKK-2". The Journal of Biological Chemistry. 277 (16): 13840–13847. doi:10.1074/jbc.M110474200. PMID 11839743.
• Chariot A, Leonardi A, Muller J, Bonif M, Brown K, Siebenlist U (October 2002). "Association of the adaptor TANK with the I kappa B kinase (IKK) regulator NEMO connects IKK complexes with IKK epsilon and TBK1 kinases". The Journal of Biological Chemistry. 277 (40): 37029–37036. doi:10.1074/jbc.M205069200. PMID 12133833.
• Li SF, Fujita F, Hirai M, Lu R, Niida H, Nakanishi M (January 2003). "Genomic structure and characterization of the promoter region of the human NAK gene". Gene. 304: 57–64. doi:10.1016/S0378-1119(02)01179-4. PMID 12568715.
• Fitzgerald KA, McWhirter SM, Faia KL, Rowe DC, Latz E, Golenbock DT, et al. (May 2003). "IKKepsilon and TBK1 are essential components of the IRF3 signaling pathway". Nature Immunology. 4 (5): 491–496. doi:10.1038/ni921. PMID 12692549. S2CID 19867234.
• Sharma S, tenOever BR, Grandvaux N, Zhou GP, Lin R, Hiscott J (May 2003). "Triggering the interferon antiviral response through an IKK-related pathway". Science. 300 (5622): 1148–1151. Bibcode:2003Sci...300.1148S. doi:10.1126/science.1081315. PMID 12702806. S2CID 42641584.
• Matsuda A, Suzuki Y, Honda G, Muramatsu S, Matsuzaki O, Nagano Y, et al. (May 2003). "Large-scale identification and characterization of human genes that activate NF-kappaB and MAPK signaling pathways". Oncogene. 22 (21): 3307–3318. doi:10.1038/sj.onc.1206406. PMID 12761501.
• Sato S, Sugiyama M, Yamamoto M, Watanabe Y, Kawai T, Takeda K, Akira S (October 2003). "Toll/IL-1 receptor domain-containing adaptor inducing IFN-beta (TRIF) associates with TNF receptor-associated factor 6 and TANK-binding kinase 1, and activates two distinct transcription factors, NF-kappa B and IFN-regulatory factor-3, in the Toll-like receptor signaling". Journal of Immunology. 171 (8): 4304–4310. doi:10.4049/jimmunol.171.8.4304. PMID 14530355.
• Fujita F, Taniguchi Y, Kato T, Narita Y, Furuya A, Ogawa T, et al. (November 2003). "Identification of NAP1, a regulatory subunit of IkappaB kinase-related kinases that potentiates NF-kappaB signaling". Molecular and Cellular Biology. 23 (21): 7780–7793. doi:10.1128/MCB.23.21.7780-7793.2003. PMC 207563. PMID 14560022.
• Bouwmeester T, Bauch A, Ruffner H, Angrand PO, Bergamini G, Croughton K, et al. (February 2004). "A physical and functional map of the human TNF-alpha/NF-kappa B signal transduction pathway". Nature Cell Biology. 6 (2): 97–105. doi:10.1038/ncb1086. PMID 14743216. S2CID 11683986.
• tenOever BR, Sharma S, Zou W, Sun Q, Grandvaux N, Julkunen I, et al. (October 2004). "Activation of TBK1 and IKKvarepsilon kinases by vesicular stomatitis virus infection and the role of viral ribonucleoprotein in the development of interferon antiviral immunity". Journal of Virology. 78 (19): 10636–10649. doi:10.1128/JVI.78.19.10636-10649.2004. PMC 516426. PMID 15367631.
• Kuai J, Wooters J, Hall JP, Rao VR, Nickbarg E, Li B, et al. (December 2004). "NAK is recruited to the TNFR1 complex in a TNFalpha-dependent manner and mediates the production of RANTES: identification of endogenous TNFR-interacting proteins by a proteomic approach". The Journal of Biological Chemistry. 279 (51): 53266–53271. doi:10.1074/jbc.M411037200. PMID 15485837.
• Buss H, Dörrie A, Schmitz ML, Hoffmann E, Resch K, Kracht M (December 2004). "Constitutive and interleukin-1-inducible phosphorylation of p65 NF-κB at serine 536 is mediated by multiple protein kinases including IκB kinase IKK-α, IKK-β, IKK-ε, TRAF family member-associated (TANK)-binding kinase 1 (TBK1), and an unknown kinase and couples p65 to TATA-binding protein-associated factor II31-mediated interleukin-8 transcription". The Journal of Biological Chemistry. 279 (53): 55633–55643. doi:10.1074/jbc.M409825200. PMID 15489227.