The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
Identity check. The target is human TTBK2, tau-tubulin kinase 2, also designated KIAA0847 in the supplied UniProt record. A human-cell phosphoproteomic study explicitly identifies the canonical TTBK2 sequence as Q6IQ55. TTBK2 is a CK1-related serine/threonine protein kinase with an N-terminal catalytic domain and a long, functionally important noncatalytic C-terminal region. It is not TTBK1: their kinase domains are highly similar, but their remaining sequences and experimentally observed activities differ. The kinase-domain and ATP-binding annotations supplied with the accession are consistent with this literature. (bernatik2020phosphorylationofmultiple pages 10-13, bouskila2011ttbk2kinasesubstrate pages 1-2, liao2015ttbk2atau pages 1-2)
TTBK2 transfers the terminal phosphate of ATP to serine or threonine residues on protein substrates, generating ADP and a phosphorylated protein. Its best-established physiological role is to control primary-cilium assembly and maintenance at the distal appendages of the mother centriole, which becomes the ciliary basal body. It is an intracellular kinase, not a secreted protein or membrane transporter. In human retinal epithelial cells, the distal-appendage protein CEP164 recruits TTBK2; CEP164 depletion prevents TTBK2 recruitment, whereas redirecting TTBK2 to appendages can restore cilium formation. Superresolution microscopy further shows that, during serum-starvation-induced ciliogenesis, TTBK2 shifts from the appendage periphery toward its CEP83-containing root. (cajanek2014cep164triggersciliogenesis pages 8-8, cajanek2014cep164triggersciliogenesis pages 2-3, lo2019phosphorylationofcep83 pages 1-2)
The mechanistic sequence is more informative than the protein’s historical name. CEP164 positions TTBK2 at the mother centriole; TTBK2 phosphorylates appendage and cap-associated proteins; these events enable ciliary-vesicle docking, removal of the inhibitory CP110–CEP97 cap, recruitment or retention of intraflagellar-transport (IFT) machinery, and growth of the microtubule axoneme. CP110 removal is a TTBK2-dependent outcome, not evidence that CP110 itself is a confirmed direct TTBK2 substrate. Ciliary-vesicle docking generally precedes CP110 removal, although individual recruitment and membrane-trafficking events are not necessarily governed by one universal linear timetable. TTBK2 loss can allow early initiation events while preventing axoneme extension. (cajanek2014cep164triggersciliogenesis pages 8-8, bernatik2020phosphorylationofmultiple pages 1-5, bernatik2020phosphorylationofmultiple pages 19-21, lo2019phosphorylationofcep83 pages 8-10)
The following evidence map separates biochemically supported phosphorylation from downstream effects. The cropped Figure 7 panels in Lo and colleagues’ study illustrate the effects of CEP83 phosphosite mutants on vesicle docking and CP110 removal, alongside the authors’ proposed mechanism. (lo2019phosphorylationofcep83 media 98032bbe, lo2019phosphorylationofcep83 media a0a97781, lo2019phosphorylationofcep83 pages 8-10)
| Substrate / regulator | Specific biochemical event and cellular site | Biological outcome | Evidence status | Source (year; DOI) |
|---|---|---|---|---|
| CEP164 | Its N-terminal WW domain recruits TTBK2 to distal appendages of the mother centriole; TTBK2 then phosphorylates CEP164 at multiple sites, including T1309, S1317, S1346, S1347 and S1443. | Positions active TTBK2 at the nascent ciliary base, enabling IFT recruitment, CP110-cap removal and progression toward axoneme extension. | Human-cell depletion/rescue, interaction and phosphoproteomic evidence; CEP164 is the most extensively modified ciliary substrate identified. (cajanek2014cep164triggersciliogenesis pages 8-8, bernatik2020phosphorylationofmultiple pages 36-39, bernatik2020phosphorylationofmultiple pages 19-21) | Čajánek & Nigg (2014), 10.1073/pnas.1401777111; Bernatik et al. (2020), 10.1091/mbc.e19-06-0334 |
| CEP83 | Direct TTBK2 phosphorylation at S29, T292, T527 and S698 after CEP164-dependent recruitment; occurs near the root of mother-centriole distal appendages. | Promotes ciliary-vesicle docking, subsequent CP110 removal, transition-zone assembly and cilium initiation; phosphodead CEP83-4A is defective, whereas phosphomimetic CEP83-DEED rescues/promotes ciliogenesis. (lo2019phosphorylationofcep83 pages 4-6, lo2019phosphorylationofcep83 pages 6-8, lo2019phosphorylationofcep83 pages 8-10) | Purified-protein kinase assays, phosphosite MS, phosphospecific antibodies and human-cell phosphodead/phosphomimetic rescue experiments. | Lo et al. (2019), 10.1083/jcb.201811142 |
| CEP97 / MPP9 | CEP97 is a reported TTBK2 substrate; MPP9 is phosphorylated at S629 and S636 at the distal mother-centriole cap. | MPP9 phosphorylation promotes its proteasomal degradation and facilitates removal of the CP110–CEP97 cap, permitting axoneme extension. CP110 is a downstream cap component, not an established direct TTBK2 substrate. (bernatik2020phosphorylationofmultiple pages 19-21, bernatik2020phosphorylationofmultiple pages 1-5, lo2019phosphorylationofcep83 pages 8-10) | Prior substrate studies synthesized in a phosphoproteomic primary study and recent review; direct necessity is strongest for MPP9 phosphorylation, while the relevant CEP97 phosphosite is not specified here. | Bernatik et al. (2020), 10.1091/mbc.e19-06-0334; Felício & Santos (2024), 10.1007/s12311-023-01540-6 |
| CEP89, CCDC92, Rabin8 and DVL3 | TTBK2 directly phosphorylates these distal-appendage- or ciliogenesis-associated proteins, predominantly at multiple S/T residues in intrinsically disordered regions. | Supports a model of coordinated multisite control of distal-appendage organization, vesicle trafficking and ciliogenesis; individual phosphosites have not all been proven necessary in vivo. (bernatik2020phosphorylationofmultiple pages 1-5, bernatik2020phosphorylationofmultiple pages 10-13) | Biochemical kinase assays and MS in human-cell-derived proteins; functional necessity remains incompletely established for each candidate. | Bernatik et al. (2020), 10.1091/mbc.e19-06-0334 |
| EB1/EB3–KIF2A module | C-terminal SxIP-mediated interaction associates TTBK2 with EB1/EB3 at growing microtubule plus ends; TTBK2 phosphorylates KIF2A at S135. | Reduces KIF2A microtubule binding and depolymerase activity, thereby restraining microtubule shrinkage and supporting microtubule stability. (felicio2024spinocerebellarataxiatype pages 4-6, bernatik2020phosphorylationofmultiple pages 1-5) | In-vitro phosphorylation and cellular microtubule-dynamics evidence, summarized in the 2024 SCA11 review. | Felício & Santos (2024), 10.1007/s12311-023-01540-6 |
| HUWE1 | Centrosomal HECT E3 ligase physically associates with and polyubiquitinates the TTBK2 C-terminal region, promoting proteasomal degradation; exact ubiquitinated lysines remain unidentified. | Lowers centrosomal TTBK2 and promotes primary-cilium disassembly; the HUWE1–TTBK2 axis regulates SHH-responsive cerebellar granule-progenitor proliferation and affects SHH-medulloblastoma growth in preclinical models. (lin2024regulationofprimary pages 12-12, lin2024regulationofprimary pages 5-6, lin2024regulationofprimary pages 6-9) | Co-immunoprecipitation, cellular ubiquitination, inhibitor/knockdown studies and mouse-progenitor/tumor-cell perturbations; not clinical efficacy evidence. | Lin et al. (2024), 10.1038/s41418-024-01325-2 |
| TTBK1 versus TTBK2 at neuronal tau S422 | Although both isoforms can phosphorylate tau in overexpression systems, neuronal tau S422 phosphorylation is driven principally by TTBK1, not TTBK2. | Prevents misannotation of pathological tau-S422 signaling as a primary TTBK2 function; TTBK2’s best-established core role is cilium initiation and maintenance. (bao2021mechanismsofregulation pages 12-13, bao2021mechanismsofregulation pages 1-2, bao2021mechanismsofregulation pages 5-7) | Isoform-specific knockdown, overexpression, immunoblotting and MS; TTBK1 knockdown reduced neuronal S422 phosphorylation, whereas TTBK2 knockdown did not. | Bao et al. (2021), 10.1007/s10571-020-00875-6 |
Table: A compact evidence map distinguishing direct TTBK2 substrates and regulators from downstream ciliary effects and incompletely validated candidates. It also highlights the important TTBK1—not TTBK2—nuance for neuronal tau-S422 phosphorylation.
Substrate specificity requires a qualification. An earlier synthetic-peptide assay found that a truncated TTBK2 preparation favored a priming phosphotyrosine two residues after the phosphorylated serine/threonine. However, mapping substrates with full-length kinase in human-cell-based experiments did not find this to be a dominant motif among verified ciliary targets. Instead, some sites resemble CK1-type phosphoserine/phosphothreonine-primed motifs, with additional enrichment for leucine at +1 or glutamate at +3 in subsets of targets. Thus, no single short peptide sequence adequately defines TTBK2’s physiological substrates: localization, partner binding and multisite phosphorylation also matter. A 2020 study assigned 45 TTBK2-induced serine/threonine sites across six examined proteins in its in-vitro dataset; that is a result of a targeted screen, not a count of all physiological TTBK2 substrates. (bouskila2011ttbk2kinasesubstrate pages 1-2, bernatik2020phosphorylationofmultiple pages 19-21, bernatik2020phosphorylationofmultiple pages 10-13)
Among the strongest substrate-level results, purified TTBK2 directly phosphorylates CEP83 at S29, T292, T527 and S698. In human cells, replacing these four residues with nonphosphorylatable alanines impairs ciliary-vesicle docking and ciliation despite preservation of measured appendage assembly and TTBK2/IFT88 recruitment; a phosphomimetic CEP83 variant restores or promotes ciliation. Phosphorylation of CEP164 is also strongly supported by kinase assays, multiple mapped sites, and the finding that wild-type—but not kinase-dead—TTBK2 restores CEP164 modification and ciliation in TTBK2-knockout cells. Other reported substrates include MPP9 and CEP97, which participate in cap removal, and biochemically phosphorylated CEP89, CCDC92, Rabin8 and DVL3; the necessity of every individual site on these latter proteins in vivo has not been established. (lo2019phosphorylationofcep83 pages 4-6, lo2019phosphorylationofcep83 pages 6-8, lo2019phosphorylationofcep83 pages 8-10, bernatik2020phosphorylationofmultiple pages 36-39, bernatik2020phosphorylationofmultiple pages 10-13)
TTBK2 remains relevant after a cilium has formed. In a 2023 conditional-deletion study of mouse embryonic fibroblasts, removal of Ttbk2 after assembly caused ciliary breakage, reduced axonemal tubulin polyglutamylation, changes in centriolar-satellite composition, and loss of basal-body IFT-protein pools. Ciliated-cell frequency at 48 hours was 29.66% ± 2.662% in Ttbk2-deleted cultures versus 70.00% ± 3.46% in controls; at 72 hours, it was 10.989% ± 2.549% versus 71.299% ± 3.213%. These are model-specific measurements, not estimates of human tissue ciliation. The work establishes a postassembly requirement but does not prove that TTBK2 directly phosphorylates tubulin to cause the observed polyglutamylation change. [Nguyen and Goetz, Molecular Biology of the Cell, published January 2023; https://doi.org/10.1091/mbc.e22-08-0373.] (nguyen2023ttbk2controlscilium pages 1-2, nguyen2023ttbk2controlscilium pages 3-5, nguyen2023ttbk2controlscilium pages 5-8)
A 2024 study added an abundance-control mechanism: the centrosomal E3 ligase HUWE1 associates with TTBK2 and promotes its ubiquitination and degradation. HUWE1 inhibition or depletion raises TTBK2 abundance and favors cilium persistence in the investigated models; the precise ubiquitinated lysines remain unidentified. In cerebellar granule-neuron progenitor models, TTBK2-supported cilia sustain responsiveness to Sonic Hedgehog (SHH) signaling, assessed in part through Gli1 and proliferation measurements. TTBK2 depletion also impaired growth and colony formation in investigated SHH-medulloblastoma cell models. This is evidence for a cilium-dependent pathway and a preclinical target hypothesis, not evidence that TTBK2 directly phosphorylates SHH-pathway receptors or that its inhibition treats patients. [Lin and colleagues, Cell Death & Differentiation, published online June 2024; https://doi.org/10.1038/s41418-024-01325-2.] (lin2024regulationofprimary pages 5-6, lin2024regulationofprimary pages 9-12, lin2024regulationofprimary pages 12-12)
In another experimentally defined pathway, pathogenic LRRK2 phosphorylates Rab10; phosphorylated Rab10 acting with RILPL1 prevents TTBK2 recruitment to the mother centriole and consequently blocks CP110 release. The direction matters: LRRK2 acts upstream of TTBK2 here; Rab10 should not be annotated as a TTBK2 substrate on this evidence. [Sobu and colleagues, PNAS, March 2021; https://doi.org/10.1073/pnas.2005894118.] (sobu2021pathogeniclrrk2regulates pages 1-2)
Outside the basal body, TTBK2 has been reported at EB1/EB3-marked growing microtubule plus ends, where phosphorylation of the depolymerase KIF2A at S135 reduces KIF2A-associated microtubule destabilization. Tau and TDP-43 are also reported kinase substrates, but these observations should not displace the stronger functional annotation centered on ciliogenesis. In particular, isoform-specific neuronal experiments indicate that TTBK1, rather than TTBK2, is the principal kinase for tau S422 phosphorylation in the systems tested. A crystal structure of the ADP-bound TTBK2 catalytic domain supports the kinase assignment, while distinct regulatory sequences and autophosphorylation help explain why TTBK1 and TTBK2 cannot be treated as functionally interchangeable. (felicio2024spinocerebellarataxiatype pages 4-6, bernatik2020phosphorylationofmultiple pages 1-5, bao2021mechanismsofregulation pages 5-7, bao2021mechanismsofregulation pages 1-2)
TTBK2 variants cause spinocerebellar ataxia type 11 (SCA11), a rare autosomal-dominant disorder characterized chiefly by progressive cerebellar ataxia. The familial pathogenic variants emphasized in a review published online March 2023 and in print 2024 were predominantly frameshifts producing C-terminally truncated protein. The reviewers stress that whether disease reflects haploinsufficiency, dominant interference with full-length TTBK2, defective cilia, additional neuronal substrates, or a combination remains unresolved; SCA11 is not straightforwardly equivalent to a classic multisystem ciliopathy. [Felício and Santos, The Cerebellum, 2024; https://doi.org/10.1007/s12311-023-01540-6.] (felicio2024spinocerebellarataxiatype pages 1-2)
One 2024 family study of c.3290T>C, p.Val1097Ala reported reduced CEP164 association and cilium formation without a measured loss of kinase activity or protein abundance. Its pedigree comprised 26 people across three generations, 10 affected. This offers a plausible localization-based mechanism for that variant in experimental cells, but one family and transfection-based assays do not establish that all TTBK2 missense variants are pathogenic or operate identically. [Luo and colleagues, Translational Neuroscience, accepted September 2024; https://doi.org/10.1515/tnsci-2022-0353.] (luo2024ttbk2t3290cmutation pages 1-2, felicio2024spinocerebellarataxiatype pages 1-2)
Current implementation is principally research and genetic interpretation, rather than an established TTBK2-directed treatment: pathogenic-variant evaluation, ciliation/CP110/IFT assays, and tests of the HUWE1–TTBK2 or SHH-related mechanisms. Pharmacological conclusions demand particular care because TTBK1 and TTBK2 share a highly similar catalytic domain. A March 2024 review reports that investigated kinase inhibitors commonly inhibit both isoforms; for example, reported biochemical inhibitory concentrations for BMS1 were approximately 120 nM for TTBK1 and 170 nM for TTBK2, not TTBK2 selectivity. Kinase-inhibition effects should therefore be interpreted with orthogonal genetic or target-engagement controls, particularly when proposing cancer intervention in a protein needed for normal cilium biology. [Flax and colleagues, Frontiers in Molecular Biosciences, March 2024; https://doi.org/10.3389/fmolb.2024.1352781.] (flax2024illuminationofunderstudied pages 11-12, lin2024regulationofprimary pages 12-12)
Functional-annotation conclusion: The most defensible primary assignment for human TTBK2/Q6IQ55 is a CEP164-recruited, CK1-related serine/threonine kinase acting at mother-centriole distal appendages to phosphorylate ciliogenesis factors—particularly CEP83 and CEP164—and enable primary-cilium initiation and subsequent stability. Its additional microtubule-plus-end and neuronal-substrate activities are relevant, but their contribution to human SCA11 relative to ciliary dysfunction remains an open mechanistic question. (cajanek2014cep164triggersciliogenesis pages 8-8, lo2019phosphorylationofcep83 pages 4-6, bernatik2020phosphorylationofmultiple pages 19-21, nguyen2023ttbk2controlscilium pages 1-2, felicio2024spinocerebellarataxiatype pages 1-2)
References
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(lo2019phosphorylationofcep83 pages 8-10): Chien-Hui Lo, I-Hsuan Lin, T. Tony Yang, Yen-Chun Huang, Barbara E. Tanos, Po-Chun Chou, Chih-Wei Chang, Yeou-Guang Tsay, Jung-Chi Liao, and Won-Jing Wang. Phosphorylation of cep83 by ttbk2 is necessary for cilia initiation. The Journal of Cell Biology, 218:3489-3505, Aug 2019. URL: https://doi.org/10.1083/jcb.201811142, doi:10.1083/jcb.201811142. This article has 86 citations.
(lo2019phosphorylationofcep83 media 98032bbe): Chien-Hui Lo, I-Hsuan Lin, T. Tony Yang, Yen-Chun Huang, Barbara E. Tanos, Po-Chun Chou, Chih-Wei Chang, Yeou-Guang Tsay, Jung-Chi Liao, and Won-Jing Wang. Phosphorylation of cep83 by ttbk2 is necessary for cilia initiation. The Journal of Cell Biology, 218:3489-3505, Aug 2019. URL: https://doi.org/10.1083/jcb.201811142, doi:10.1083/jcb.201811142. This article has 86 citations.
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(lo2019phosphorylationofcep83 pages 6-8): Chien-Hui Lo, I-Hsuan Lin, T. Tony Yang, Yen-Chun Huang, Barbara E. Tanos, Po-Chun Chou, Chih-Wei Chang, Yeou-Guang Tsay, Jung-Chi Liao, and Won-Jing Wang. Phosphorylation of cep83 by ttbk2 is necessary for cilia initiation. The Journal of Cell Biology, 218:3489-3505, Aug 2019. URL: https://doi.org/10.1083/jcb.201811142, doi:10.1083/jcb.201811142. This article has 86 citations.
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(lin2024regulationofprimary pages 5-6): I-Hsuan Lin, Yue-Ru Li, Chia-Hsiang Chang, Yu-Wen Cheng, Yu-Ting Wang, Yu-Shuen Tsai, Pei-Yi Lin, Chien-Han Kao, Ting-Yu Su, Chih-Sin Hsu, Chien-Yi Tung, Pang-Hung Hsu, Olivier Ayrault, Bon-chu Chung, Jin-Wu Tsai, and Won-Jing Wang. Regulation of primary cilia disassembly through huwe1-mediated ttbk2 degradation plays a crucial role in cerebellar development and medulloblastoma growth. Cell Death and Differentiation, 31:1349-1361, Jun 2024. URL: https://doi.org/10.1038/s41418-024-01325-2, doi:10.1038/s41418-024-01325-2. This article has 16 citations and is from a domain leading peer-reviewed journal.
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(bao2021mechanismsofregulation pages 1-2): Channa Bao, Bekim Bajrami, Douglas J. Marcotte, Jayanth V. Chodaparambil, Hannah M. Kerns, Jaclyn Henderson, Ru Wei, Benbo Gao, and Gregory M. Dillon. Mechanisms of regulation and diverse activities of tau-tubulin kinase (ttbk) isoforms. Cellular and Molecular Neurobiology, 41:669-685, May 2021. URL: https://doi.org/10.1007/s10571-020-00875-6, doi:10.1007/s10571-020-00875-6. This article has 26 citations and is from a peer-reviewed journal.
(bao2021mechanismsofregulation pages 5-7): Channa Bao, Bekim Bajrami, Douglas J. Marcotte, Jayanth V. Chodaparambil, Hannah M. Kerns, Jaclyn Henderson, Ru Wei, Benbo Gao, and Gregory M. Dillon. Mechanisms of regulation and diverse activities of tau-tubulin kinase (ttbk) isoforms. Cellular and Molecular Neurobiology, 41:669-685, May 2021. URL: https://doi.org/10.1007/s10571-020-00875-6, doi:10.1007/s10571-020-00875-6. This article has 26 citations and is from a peer-reviewed journal.
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(nguyen2023ttbk2controlscilium pages 3-5): Abraham Nguyen and Sarah C. Goetz. Ttbk2 controls cilium stability by regulating distinct modules of centrosomal proteins. Jan 2023. URL: https://doi.org/10.1091/mbc.e22-08-0373, doi:10.1091/mbc.e22-08-0373. This article has 16 citations and is from a domain leading peer-reviewed journal.
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