{"gene":"NEK6","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2003,"finding":"NEK9/Nercc1 directly phosphorylates NEK6 at Ser206 on its activation loop in vitro, causing 20-25-fold activation of NEK6 kinase activity; this phosphorylation also occurs in vivo during mitosis and is stimulated by co-expression with activated NEK9 mutant, establishing a NEK9→NEK6 mitotic kinase cascade.","method":"In vitro kinase assay with recombinant proteins, co-expression of activated NEK9 mutant with NEK6 in cells, mass spectrometry phosphosite identification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of direct phosphorylation with defined phosphosite, confirmed in vivo, replicated across multiple studies","pmids":["12840024"],"is_preprint":false},{"year":2001,"finding":"NEK6 (and NEK7) were purified from rat liver as the major kinase activity phosphorylating the p70 S6 kinase hydrophobic motif site Thr412; recombinant NEK6 phosphorylates p70 S6K at Thr412 and activates it in vitro and in vivo synergistically with PDK1; kinase-inactive NEK6 interferes with insulin-induced p70 S6K activation.","method":"Biochemical purification from rat liver, in vitro kinase assay, co-expression/dominant-negative in cells","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical purification plus in vitro reconstitution plus cellular dominant-negative phenotype, replicated across multiple studies","pmids":["11516946"],"is_preprint":false},{"year":2002,"finding":"NEK6 has a strong substrate specificity preference for Leu at the -3 position relative to the phosphorylation site; mutation of this Leu in S6K1 or SGK1 prevents their in vitro phosphorylation by NEK6, but these mutants are still phosphorylated at the hydrophobic motif in cells after IGF-1 stimulation, indicating NEK6 is NOT responsible for insulin/IGF-1-induced hydrophobic motif phosphorylation of S6K, SGK, or PKB in vivo.","method":"Peptide library (Jerini pepSTAR) kinetic analysis, in vitro phosphorylation of mutant S6K1/SGK1, transfected 293 cells with IGF-1 stimulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — substrate specificity defined by systematic peptide analysis plus mutagenesis validation in vitro and in vivo; negative result for physiological S6K phosphorylation replicated and confirmed","pmids":["12023960"],"is_preprint":false},{"year":2003,"finding":"NEK6 is required for cell cycle progression through mitosis in human cells; inhibition of NEK6 by kinase-inactive mutant or siRNA causes metaphase arrest prior to apoptosis, as shown by time-lapse microscopy.","method":"siRNA knockdown, dominant-negative kinase-inactive mutant overexpression, time-lapse microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — two orthogonal loss-of-function approaches (siRNA + dominant-negative), specific cell cycle arrest phenotype defined; replicated across multiple studies","pmids":["14563848"],"is_preprint":false},{"year":2008,"finding":"NEK6 is constitutively associated with Eg5 (KIF11/Kinesin-5) and phosphorylates Eg5 at Ser1033 in vivo during mitosis primarily at spindle poles; this phosphorylation is required for full mitotic function of Eg5, as Eg5[Ser1033Ala] rescues only ~50% of cells depleted of Eg5 compared to wild-type, while a phosphomimetic Ser1033Asp rescues nearly as well as wild-type.","method":"Co-immunoprecipitation, in vitro kinase assay, phosphospecific antibody, rescue experiments with Eg5 point mutants in RNAi-depleted cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — constitutive interaction by Co-IP, in vitro phosphorylation, in vivo phosphosite validation, mutagenesis rescue experiment","pmids":["19001501"],"is_preprint":false},{"year":2009,"finding":"NEK6 and NEK7 are both required for robust mitotic spindle formation and cytokinesis; depletion of either causes metaphase arrest with fragile spindles and apoptosis; NEK6 specifically localizes to spindle microtubules in metaphase/anaphase and to the midbody during cytokinesis, while NEK7 shows only spindle pole localization, demonstrating their non-redundant roles.","method":"siRNA depletion, dominant-negative mutant expression, antibody localization/immunofluorescence, SAC inhibitor combination experiments","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal depletion phenotypes, multiple orthogonal approaches, specific localization; replicated across labs","pmids":["19414596"],"is_preprint":false},{"year":2011,"finding":"PLK1 is identified as a direct activator of NEK9, which in turn activates NEK6/7; PLK1 controls prophase centrosome separation through NEK9 activation and subsequent NEK6/7-dependent phosphorylation of kinesin Eg5 at Ser1033, and the CDK1 site Thr926 together contribute to Eg5 centrosome accumulation and centrosome separation.","method":"Co-immunoprecipitation, kinase assays, phosphospecific antibodies, siRNA depletion, rescue experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct kinase assay, epistasis established by sequential depletion and rescue, confirmed phosphosites with mutagenesis","pmids":["21642957"],"is_preprint":false},{"year":2011,"finding":"DYNLL/LC8 binds to the Nek9 C-terminal region via a (K/R)XTQT motif, causing Nek9 multimerization and accelerating Nek9 autoactivation; LC8 binding to Nek9 is negatively regulated by Nek9 autophosphorylation at Ser944; LC8 binding also competitively interferes with Nek9-Nek6 interaction and Nek6 activation, acting as a regulatory brake on the Nek9→Nek6 cascade.","method":"Co-immunoprecipitation, in vitro kinase assays, mutagenesis of Nek9 phosphosite and binding motif","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reciprocal Co-IP, in vitro phosphorylation, binding motif mutagenesis, competition assay; single lab with multiple orthogonal methods","pmids":["21454704"],"is_preprint":false},{"year":2010,"finding":"NEK6 interacts with STAT3 and phosphorylates STAT3 at Ser727, which is important for transcriptional activation; both Ser206 and Thr210 phosphorylation of NEK6 itself are required for this activity and for anchorage-independent transformation; NEK6 knockdown reduces colony formation and STAT3 Ser727 phosphorylation.","method":"Co-immunoprecipitation, in vitro kinase assay, NEK6 phosphosite mutants, siRNA knockdown, anchorage-independent growth assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction, in vitro kinase assay, mutagenesis of NEK6 activation sites; single lab","pmids":["20595392"],"is_preprint":false},{"year":2008,"finding":"NEK6 is phosphorylated upon IR and UV irradiation through the DNA damage checkpoint; Chk1 and Chk2 directly phosphorylate NEK6 in vitro; DNA damage abolishes NEK6 activation during mitosis; ectopic NEK6 overexpression overrides DNA damage-induced G2/M arrest, placing NEK6 downstream of the checkpoint kinases as a required effector.","method":"In vitro kinase assay with Chk1/Chk2, immunoprecipitation-kinase assay from irradiated cells, overexpression studies","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro phosphorylation by Chk1/Chk2, in vivo loss of activation, epistasis via overexpression; single lab","pmids":["18728393"],"is_preprint":false},{"year":2015,"finding":"NEK6 phosphorylates Hsp72 at Thr66 within its nucleotide-binding domain, targeting it to the mitotic spindle; phosphorylated Hsp72 concentrates at spindle poles and kinetochore-microtubule attachment sites; Hsp72 promotes K-fiber assembly by facilitating ch-TOG and TACC3 interaction and their recruitment to spindle MTs; a phosphomimetic Hsp72 (T66D) rescues K-fiber defects, ch-TOG/TACC3 recruitment defects, and mitotic arrest caused by NEK6 depletion.","method":"In vitro kinase assay, phosphospecific antibody, siRNA depletion, phosphomimetic rescue, co-immunoprecipitation, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro phosphorylation plus phosphomimetic rescue experiment plus co-IP of substrate complex; multiple orthogonal methods in one study","pmids":["25940345"],"is_preprint":false},{"year":2011,"finding":"Human NEK6 is a monomeric, mostly globular kinase with a flexible, disordered N-terminal domain; SAXS reveals slightly elongated shape in solution; phosphorylation state affects NEK6 conformation (higher phosphorylation increases Stokes radius); the disordered N-terminal domain mediates interactions with diverse partners.","method":"SAXS, SEC-MALS, circular dichroism, homology modeling, thermal shift assay","journal":"BMC structural biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple biophysical methods for low-resolution structure; single lab, no functional mutagenesis to validate domain roles","pmids":["21320329"],"is_preprint":false},{"year":2010,"finding":"NEK6 overexpression suppresses p53-induced senescence in a kinase-activity-dependent manner; kinase-dead NEK6 does not affect p53-induced senescence; NEK6 overexpression reduces cell cycle arrest in G1/G2M, maintains cyclin B and cdc2 levels, and inhibits ROS increases induced by p53.","method":"NEK6 overexpression and kinase-dead mutant in cancer cell lines, flow cytometry, Western blot for cyclin B/cdc2","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-dead control used to demonstrate activity-dependence, multiple readouts; single lab","pmids":["21099361"],"is_preprint":false},{"year":2016,"finding":"NEK6 phosphorylates TPP1 (shelterin component) at Ser255 during G2/M phase; this phosphorylation regulates the association between telomerase activity and TPP1; POT1 negatively regulates TPP1 Ser255 phosphorylation; NEK6-TPP1 interaction was detected in human cells.","method":"Co-immunoprecipitation, phosphospecific antibody for TPP1 Ser255, cell synchronization, telomerase activity assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, in vivo phosphosite, functional readout (telomerase association); single lab, single study","pmids":["27396482"],"is_preprint":false},{"year":2019,"finding":"NEK6 and NEK7 phosphorylate EML4 at Ser144 and Ser146 within its basic N-terminal domain; these phosphorylations reduce EML4 affinity for the acidic C-terminal tails of α/β-tubulin on the microtubule surface; depletion of NEK6/7 increases EML4-microtubule binding in mitosis; EML4 S144A-S146A double mutant binds inappropriately to mitotic microtubules, stabilizes them, and impairs chromosome congression.","method":"In vitro kinase assay, microtubule sedimentation assay, cryo-EM 3D reconstruction, depletion by siRNA, EML4 phosphosite mutant analysis","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with defined phosphosites, cryo-EM structural analysis of binding interface, mutagenesis rescue, multiple orthogonal methods","pmids":["31409757"],"is_preprint":false},{"year":2017,"finding":"NEK6 and its upstream activators PLK1 and Aurora-A target Hsp72 to the poles of cells with amplified centrosomes, promoting centrosome clustering into pseudo-bipolar spindles; blocking Hsp72 or NEK6 triggers multipolar spindle formation only in cells with amplified centrosomes, not in normal cells.","method":"siRNA depletion, phosphospecific antibodies, immunofluorescence in cancer cells with amplified centrosomes vs. normal cells","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis via depletion, context-specific spindle phenotype; single lab, limited mechanistic detail in abstract","pmids":["28720575"],"is_preprint":false},{"year":2015,"finding":"NEK6 directly interacts with GBP-1, making NEK6 a component of the cytoskeletal gateway of drug resistance; NEK6 expression is induced by hypoxia in a HIF-1α-dependent manner in ovarian cancer cells.","method":"Far western blot for NEK6-GBP1 interaction, hypoxia treatment, HIF-1α silencing, overexpression/silencing of NEK6","journal":"American journal of cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-method protein interaction (far western blot), limited mechanistic follow-up; single lab","pmids":["26269749"],"is_preprint":false},{"year":2006,"finding":"Pin1 (peptidyl-prolyl isomerase) interacts with NEK6, as confirmed by GST pull-down and co-immunoprecipitation and immunofluorescence colocalization in cells.","method":"GST pull-down, co-immunoprecipitation, immunofluorescence colocalization","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reciprocal Co-IP and pull-down but no functional characterization of the interaction; single lab","pmids":["16476580"],"is_preprint":false},{"year":2015,"finding":"NEK6 interacts with Smad4 and over-expression of NEK6 suppresses TGFβ-mediated transcriptional activity in a kinase activity-dependent manner; NEK6 blocks nuclear translocation of Smad4 and suppresses TGFβ-induced cell growth arrest; NEK6 expression is itself regulated by TGFβ and hypoxia.","method":"Co-immunoprecipitation, reporter assay for TGFβ transcriptional activity, subcellular fractionation for Smad4 localization, kinase-dead NEK6 mutant","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction, kinase-activity dependence confirmed by kinase-dead mutant, functional reporter assay; single lab","pmids":["25523445"],"is_preprint":false},{"year":2020,"finding":"miR-325-3p upregulation after M. tuberculosis infection directly targets LNX1 (an E3 ubiquitin ligase of NEK6), reducing LNX1-mediated proteasomal degradation of NEK6; accumulated NEK6 activates STAT3 signaling, inhibiting macrophage apoptosis and promoting intracellular M. tuberculosis survival.","method":"miRNA target validation, LNX1 as E3 ligase for NEK6 demonstrated, STAT3 signaling readout, Mir325-deficient mice, macrophage cell and mouse models","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — LNX1 identified as E3 ubiquitin ligase for NEK6, miR-325-3p target validation, in vivo mouse model; single lab","pmids":["32487755"],"is_preprint":false},{"year":2016,"finding":"Phosphoproteome profiling identified transcription factor FOXJ2 as a novel NEK6 substrate in the context of castration resistance; NEK6 overexpression stimulates cytoskeletal, differentiation, and immune signaling gene expression programs.","method":"Phosphoproteome profiling, gene expression profiling, kinome screen","journal":"Cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — phosphoproteomics identifies substrate but direct kinase-substrate assay not described in abstract; single lab","pmids":["27899381"],"is_preprint":false},{"year":2021,"finding":"NEK6 associates with and phosphorylates STAT3; NEK6 kinase activity is required for induction of GFAP and PCNA (markers of reactive astrogliosis); NEK6 is also localized in the nucleus and binds to STAT3-responsive genomic elements in astrocytes; NEK6 expression is rapidly induced after brain injury and promotes reactive astrogliosis.","method":"Co-immunoprecipitation, kinase assay, ChIP (binding to STAT3 genomic elements), immunofluorescence, loss-of-function/gain-of-function in astrocytes","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, kinase assay, ChIP for genomic binding; multiple orthogonal methods; single lab","pmids":["34643969"],"is_preprint":false},{"year":2024,"finding":"NEK6 directly interacts with FOXO3 and phosphorylates it at Ser7 through kinase activity, inhibiting FOXO3 nuclear translocation; nuclear FOXO3 promotes FBXW7 transcription leading to c-MYC ubiquitination and suppression of de novo purine synthesis; NEK6-mediated inhibition of this pathway supports chemoresistance in ovarian cancer.","method":"Co-immunoprecipitation, in vitro/in vivo kinase assay for FOXO3-S7 phosphorylation, subcellular fractionation, reporter assay, xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct Co-IP interaction, kinase assay with phosphosite, functional pathway readout; single lab","pmids":["39256367"],"is_preprint":false},{"year":2025,"finding":"NEK6 phosphorylates FOXN3 at Ser412 and Ser416 in response to pro-fibrotic stimuli, leading to FOXN3 degradation; loss of FOXN3 inhibits β-TrCP-mediated ubiquitination of Smad4, stabilizing the Smad2/3/4 complex at chromatin and promoting transcriptional activation of pro-fibrotic genes, contributing to pulmonary fibrosis.","method":"In vitro kinase assay, phosphosite mutagenesis, co-immunoprecipitation, ChIP, ubiquitination assay, loss-of-function in cell and animal models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with defined phosphosites, ubiquitination assay, ChIP, multiple orthogonal methods; single lab","pmids":["39984467"],"is_preprint":false},{"year":2022,"finding":"A single amino acid residue distinguishes NEK6 from NEK7 in NLRP3 inflammasome activation: NEK7 Arg121 (vs NEK6 Gln132) mediates NLRP3 binding; substituting Gln132 with Arg in NEK6 confers NEK6 the ability to bind NLRP3 and activate the inflammasome in mouse macrophages; NEK6 does NOT support NLRP3 inflammasome activation under normal conditions.","method":"Point mutant co-immunoprecipitation, inflammasome activation assay in macrophages, mutagenesis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis defines single causative residue, functional assay in macrophages, Co-IP interaction validated; single lab but multiple orthogonal methods","pmids":["35354613"],"is_preprint":false},{"year":2024,"finding":"NEK6 kinase stimulates LSD1 histone demethylase activity in cells; NEK6 phosphorylates LSD1 at the N-terminal intrinsically disordered region (IDR); NEK6 and LSD1 strongly colocalize at distinct chromatin sub-compartments (CSCs); LSD1 IDR shows phase separation behavior in vitro and in cells, and NEK6-mediated phosphorylation promotes LSD1 concentration at CSCs, supporting dynamic transcriptional control.","method":"Co-localization/co-immunoprecipitation, in vitro and in-cell kinase assay for LSD1 phosphorylation, phase separation assay, chromatin fractionation","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct kinase-substrate relationship, phase separation assay, chromatin co-localization; multiple methods but single lab","pmids":["39523439"],"is_preprint":false},{"year":2025,"finding":"NEK6 binds to YBX1 in the cytoplasm and phosphorylates it at Ser102, promoting YBX1 nuclear translocation; nuclear YBX1 activates CDK2 and BCL2 transcription; NEK6 and CDK4/6 inhibition are synthetically lethal in endometrial cancer.","method":"Co-immunoprecipitation, phosphospecific assay, nuclear fractionation, CRISPR-Cas9 screen, in vitro and in vivo tumor models","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction, phosphosite on substrate, nuclear translocation readout, functional validation in vivo; single lab","pmids":["41560755"],"is_preprint":false},{"year":2022,"finding":"NEK6 knockout in DU-145 prostate cancer cells reduces mitochondrial respiration, causes mitochondrial fragmentation (reduced cristae), increases intracellular ROS, decreases antioxidant proteins (SOD1, SOD2, PRDX3), increases JNK phosphorylation and DNA damage markers, and reduces NF-κB2 nuclear localization; NEK6 overexpression increases antioxidant defenses.","method":"CRISPR-Cas9 knockout, Western blot, ROS assay, mitochondrial respiration assay, clonogenic assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knockout with multiple defined biochemical readouts, validated by reciprocal overexpression; single lab","pmids":["36672191"],"is_preprint":false},{"year":2026,"finding":"NEK6 knockout in DU-145 prostate cancer cells causes mitochondrial morphological defects (fragmented phenotype with reduced cristae), reduced mitochondrial respiration, increased autophagic flux targeting mitochondria (mitophagy), altered fusion/fission regulators (decreased Long-OPA1:Short-OPA1 ratio and DRP1), and increased ER-mitochondria contacts.","method":"CRISPR-Cas9 knockout, transmission electron microscopy, Western blot, mitochondrial respiration assay, autophagy flux assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knockout with TEM ultrastructural analysis, multiple organelle readouts; single lab, single study","pmids":["42193938"],"is_preprint":false},{"year":2025,"finding":"NEK6 binds TCP10L and promotes its ubiquitination and degradation; TCP10L negatively regulates glycolysis in hepatocellular carcinoma; NEK6-mediated TCP10L downregulation accelerates HCC proliferation, metastasis, and glycolysis.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown rescue experiments","journal":"Critical reviews in eukaryotic gene expression","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and ubiquitination assay, single lab, limited mechanistic depth in abstract","pmids":["40228222"],"is_preprint":false}],"current_model":"NEK6 is a mitotic serine/threonine kinase activated by NEK9/Nercc1 (itself activated by PLK1-CDK1) via direct phosphorylation of its activation loop Ser206; active NEK6 phosphorylates multiple mitotic substrates including kinesin Eg5 (Ser1033), EML4 (Ser144/146), and Hsp72 (Thr66) to promote bipolar spindle assembly, K-fiber stability, and centrosome separation/clustering; outside mitosis, NEK6 phosphorylates STAT3 (Ser727), FOXO3 (Ser7), YBX1 (Ser102), FOXN3 (Ser412/416), TPP1 (Ser255), and LSD1 to regulate transcription, senescence, telomere length, TGFβ/Smad signaling, and chemoresistance; NEK6 activity is negatively regulated during DNA damage via Chk1/Chk2 phosphorylation, and by DYNLL/LC8 competing with NEK6 binding to NEK9."},"narrative":{"mechanistic_narrative":"NEK6 is a serine/threonine kinase that functions as a terminal effector of a mitotic kinase cascade in which PLK1/CDK1 activate NEK9, and NEK9 in turn directly phosphorylates NEK6 on its activation-loop residue Ser206 to drive a 20-25-fold increase in NEK6 activity [PMID:12840024, PMID:21642957]. Activated NEK6 is required for progression through mitosis: its loss or inhibition produces metaphase arrest with fragile spindles followed by apoptosis [PMID:14563848, PMID:19414596]. Mechanistically, NEK6 localizes to spindle microtubules and the midbody and phosphorylates a set of mitotic substrates to build a functional bipolar spindle — Eg5/KIF11 at Ser1033 to promote centrosome separation [PMID:19001501, PMID:21642957], Hsp72 at Thr66 to target it to spindle poles and recruit the ch-TOG/TACC3 complex for K-fiber assembly [PMID:25940345], and EML4 at Ser144/146 to release EML4 from mitotic microtubules and permit chromosome congression [PMID:31409757]. The same cascade promotes centrosome clustering into pseudo-bipolar spindles in cells with amplified centrosomes [PMID:28720575]. NEK6 activity is restrained during DNA damage, when Chk1 and Chk2 directly phosphorylate NEK6 to block its mitotic activation, and the cascade is further tuned by DYNLL/LC8, which competes with NEK6 for binding to NEK9 [PMID:21454704, PMID:18728393]. Beyond mitosis, NEK6 acts as a regulator of transcription-factor localization and stability in diverse settings: it phosphorylates and activates STAT3 at Ser727 [PMID:20595392, PMID:34643969], phosphorylates FOXO3 (Ser7) and FOXN3 (Ser412/416) to control their nuclear access and downstream ubiquitination programs [PMID:39256367, PMID:39984467], phosphorylates YBX1 (Ser102) to drive its nuclear translocation [PMID:41560755], and stimulates LSD1 demethylase activity at chromatin sub-compartments [PMID:39523439]. Through these activities NEK6 modulates p53-induced senescence, TGFβ/Smad signaling, telomere regulation via TPP1, and chemoresistance [PMID:21099361, PMID:27396482, PMID:25523445, PMID:39256367]. A single residue (Gln132 in NEK6 versus Arg121 in NEK7) explains why NEK6, unlike its paralog NEK7, does not support NLRP3 inflammasome activation [PMID:35354613].","teleology":[{"year":2001,"claim":"Established NEK6 as a bona fide protein kinase by purifying it biochemically as a major activity phosphorylating the p70 S6 kinase hydrophobic-motif site, giving the first candidate substrate.","evidence":"Biochemical purification from rat liver plus in vitro kinase assay and dominant-negative expression","pmids":["11516946"],"confidence":"High","gaps":["Physiological relevance of S6K phosphorylation by NEK6 not yet resolved at this stage","No cellular role defined"]},{"year":2002,"claim":"Defined NEK6 substrate specificity (Leu at -3) and showed by mutagenesis that NEK6 is NOT the physiological insulin/IGF-1-induced hydrophobic-motif kinase for S6K/SGK/PKB, redirecting the search for its true biological function.","evidence":"Peptide-library kinetic analysis and mutant substrate phosphorylation in IGF-1-stimulated cells","pmids":["12023960"],"confidence":"High","gaps":["Left NEK6's authentic in vivo substrates unidentified","No connection to a cellular process yet"]},{"year":2003,"claim":"Placed NEK6 in a defined activation cascade by demonstrating direct NEK9 phosphorylation of NEK6 at activation-loop Ser206, and independently showed NEK6 is required for mitotic progression.","evidence":"In vitro reconstitution with recombinant proteins, MS phosphosite mapping, and siRNA/dominant-negative phenotyping with time-lapse microscopy","pmids":["12840024","14563848"],"confidence":"High","gaps":["Mitotic substrates of NEK6 still unknown","Upstream activator of NEK9 not yet defined"]},{"year":2008,"claim":"Identified the first mitotic substrate (Eg5 at Ser1033) and showed NEK6 is checkpoint-regulated, revealing both its effector function and how it is suppressed during DNA damage.","evidence":"Co-IP, in vitro kinase assays, phosphospecific antibodies, Eg5 mutant rescue; separately Chk1/Chk2 in vitro phosphorylation of NEK6 from irradiated cells","pmids":["19001501","18728393"],"confidence":"High","gaps":["Eg5-Ser1033-Ala only partially impaired, implying additional substrates","Chk1/Chk2 phosphosites on NEK6 and mechanism of inhibition not mapped (Medium confidence for checkpoint arm)"]},{"year":2009,"claim":"Distinguished NEK6 from its paralog NEK7 functionally, showing non-redundant localization (spindle MTs/midbody vs spindle poles) and separate requirements for spindle formation and cytokinesis.","evidence":"Reciprocal siRNA depletion, dominant-negative expression, and immunofluorescence localization","pmids":["19414596"],"confidence":"High","gaps":["Molecular basis of distinct localization not defined","Midbody substrate(s) unidentified"]},{"year":2011,"claim":"Completed the upstream wiring (PLK1→NEK9→NEK6/7→Eg5) and defined LC8/DYNLL as a competitive brake on the cascade, plus provided a low-resolution structural picture implicating the disordered N-terminus in partner binding.","evidence":"Kinase assays, sequential depletion/rescue epistasis, phosphosite mutagenesis, LC8 binding-motif mutagenesis; SAXS/SEC-MALS/CD for NEK6 architecture","pmids":["21642957","21454704","21320329"],"confidence":"High","gaps":["High-resolution NEK6 structure absent","Functional role of N-terminal disorder not validated by mutagenesis"]},{"year":2015,"claim":"Elucidated how NEK6 builds K-fibers by phosphorylating Hsp72 at Thr66 to recruit the ch-TOG/TACC3 module, and extended NEK6 into non-mitotic signaling (TGFβ/Smad4, GBP-1/chemoresistance).","evidence":"In vitro kinase assay with phosphomimetic rescue and substrate-complex Co-IP for Hsp72; Co-IP/reporter assays for Smad4; far-western for GBP-1","pmids":["25940345","25523445","26269749"],"confidence":"High","gaps":["GBP-1 interaction rests on a single method (Low confidence)","Direct Smad4 phosphorylation by NEK6 not demonstrated"]},{"year":2017,"claim":"Connected NEK6/Hsp72 to centrosome clustering, showing a context-specific (amplified-centrosome) vulnerability where NEK6 loss forces multipolar spindles.","evidence":"siRNA depletion and phosphospecific immunofluorescence in cancer vs normal cells","pmids":["28720575"],"confidence":"Medium","gaps":["Limited mechanistic detail on the clustering step","No quantitative substrate-level analysis"]},{"year":2019,"claim":"Provided structural-mechanistic understanding of how NEK6 (with NEK7) controls microtubule dynamics by phosphorylating EML4 at Ser144/146 to release it from the microtubule lattice, enabling chromosome congression.","evidence":"In vitro kinase assay, microtubule sedimentation, cryo-EM reconstruction of the binding interface, and phosphosite mutant analysis","pmids":["31409757"],"confidence":"High","gaps":["Relative NEK6 vs NEK7 contribution at this substrate not separated","Timing/spatial control of EML4 phosphorylation in vivo not fully resolved"]},{"year":2022,"claim":"Defined the single-residue determinant (NEK6 Gln132 vs NEK7 Arg121) explaining NEK6's inability to bind NLRP3, and uncovered a mitochondrial/redox-homeostasis role through CRISPR knockout phenotypes.","evidence":"Point-mutant Co-IP and inflammasome assays in macrophages; CRISPR knockout with respiration, ROS, and antioxidant-protein readouts in prostate cancer cells","pmids":["35354613","36672191"],"confidence":"High","gaps":["Direct mitochondrial substrate of NEK6 unidentified","Mechanism linking NEK6 to antioxidant defense and NF-κB2 not defined"]},{"year":2025,"claim":"Consolidated NEK6 as a phosphorylation switch governing transcription-factor localization and stability across disease contexts — FOXO3 (Ser7), FOXN3 (Ser412/416), YBX1 (Ser102), STAT3, and LSD1 — linking it to chemoresistance, fibrosis, reactive astrogliosis, and tumor proliferation.","evidence":"Co-IP, in vitro/in-cell kinase assays with defined phosphosites, ChIP, ubiquitination assays, phase-separation assays, and xenograft/animal models across multiple studies","pmids":["39256367","39984467","41560755","34643969","39523439"],"confidence":"Medium","gaps":["Each transcription-factor substrate validated by single labs","How mitotic and transcriptional NEK6 pools are spatially/temporally segregated is unknown"]},{"year":null,"claim":"It remains unresolved how a single activation-loop-regulated kinase coordinates its many spatially distinct substrate pools (spindle, centrosome, nucleus, mitochondria) and what governs substrate selection in each compartment.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of active NEK6 with substrate","No systematic in vivo substrate map distinguishing mitotic from interphase targets","Compartment-specific activation/scaffolding mechanisms undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,8,10,14,22,23,25,26]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,4,10,14]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,14]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[21,25]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[26]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[27,28]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,5,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,21,22,23,25,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,18,22]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[9]}],"complexes":[],"partners":["NEK9","DYNLL1","KIF11","EML4","STAT3","FOXO3","SMAD4","PIN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HC98","full_name":"Serine/threonine-protein kinase Nek6","aliases":["Never in mitosis A-related kinase 6","NimA-related protein kinase 6","Protein kinase SID6-1512"],"length_aa":313,"mass_kda":35.7,"function":"Protein kinase which plays an important role in mitotic cell cycle progression (PubMed:11516946, PubMed:14563848). Required for chromosome segregation at metaphase-anaphase transition, robust mitotic spindle formation and cytokinesis (PubMed:19414596). Phosphorylates ATF4, CIRSR, PTN, RAD26L, RBBP6, RPS7, RPS6KB1, TRIP4, STAT3 and histones H1 and H3 (PubMed:12054534, PubMed:20873783). Phosphorylates KIF11 to promote mitotic spindle formation (PubMed:19001501). Involved in G2/M phase cell cycle arrest induced by DNA damage (PubMed:18728393). Inhibition of activity results in apoptosis. May contribute to tumorigenesis by suppressing p53/TP53-induced cancer cell senescence (PubMed:21099361). Phosphorylates EML4 at 'Ser-144', promoting its dissociation from microtubules during mitosis which is required for efficient chromosome congression (PubMed:31409757)","subcellular_location":"Cytoplasm; Nucleus; Nucleus speckle; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/Q9HC98/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NEK6","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NEK6","total_profiled":1310},"omim":[{"mim_id":"618726","title":"NIMA-RELATED KINASE 10; NEK10","url":"https://www.omim.org/entry/618726"},{"mim_id":"609798","title":"NIMA-RELATED KINASE 9; NEK9","url":"https://www.omim.org/entry/609798"},{"mim_id":"609720","title":"CRUMBS CELL POLARITY COMPLEX COMPONENT 2; CRB2","url":"https://www.omim.org/entry/609720"},{"mim_id":"606848","title":"NIMA-RELATED KINASE 7; NEK7","url":"https://www.omim.org/entry/606848"},{"mim_id":"604884","title":"NIMA-RELATED KINASE 6; NEK6","url":"https://www.omim.org/entry/604884"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Centriolar satellite","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":64.3}],"url":"https://www.proteinatlas.org/search/NEK6"},"hgnc":{"alias_symbol":["SID6-1512"],"prev_symbol":[]},"alphafold":{"accession":"Q9HC98","domains":[{"cath_id":"3.30.200.20","chopping":"41-122","consensus_level":"high","plddt":89.246,"start":41,"end":122},{"cath_id":"1.10.510.10","chopping":"129-194_210-311","consensus_level":"high","plddt":92.8586,"start":129,"end":311}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HC98","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HC98-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HC98-F1-predicted_aligned_error_v6.png","plddt_mean":83.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NEK6","jax_strain_url":"https://www.jax.org/strain/search?query=NEK6"},"sequence":{"accession":"Q9HC98","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HC98.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HC98/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HC98"}},"corpus_meta":[{"pmid":"12840024","id":"PMC_12840024","title":"A mitotic cascade of NIMA family kinases. 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expression","url":"https://pubmed.ncbi.nlm.nih.gov/40228222","citation_count":3,"is_preprint":false},{"pmid":"39523439","id":"PMC_39523439","title":"The kinase NEK6 positively regulates LSD1 activity and accumulation in local chromatin sub-compartments.","date":"2024","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/39523439","citation_count":1,"is_preprint":false},{"pmid":"39895790","id":"PMC_39895790","title":"NEK6 functions as an oncogene to promote the proliferation and metastasis of ovarian cancer.","date":"2025","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/39895790","citation_count":1,"is_preprint":false},{"pmid":"42131349","id":"PMC_42131349","title":"Integrating single-cell and spatial transcriptomics reveals glycolysis heterogeneity and NEK6-mediated progression in colorectal cancer.","date":"2026","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/42131349","citation_count":0,"is_preprint":false},{"pmid":"40090442","id":"PMC_40090442","title":"Design and synthesis of pyridopyrimidines targeting NEK6 kinase.","date":"2025","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/40090442","citation_count":0,"is_preprint":false},{"pmid":"42193938","id":"PMC_42193938","title":"NEK6 Knockout Causes Defects in Mitochondrial Morphology and Respiration.","date":"2026","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/42193938","citation_count":0,"is_preprint":false},{"pmid":"41560755","id":"PMC_41560755","title":"Genome-wide CRISPR screen identified NEK6 as a determinant of sensitivity to CDK4/6 inhibitor in endometrial cancer.","date":"2026","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/41560755","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.22.655458","title":"PIKI-1, a class II phosphatidylinositol 3-kinase, functions in endocytic trafficking","date":"2025-05-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.22.655458","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.15.613099","title":"TAT-1, a phosphatidylserine flippase, affects molting and regulates membrane trafficking in the epidermis of  <i>C. elegans</i>","date":"2024-09-15","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.15.613099","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":33636,"output_tokens":7686,"usd":0.108099,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17060,"output_tokens":4494,"usd":0.098825,"stage2_stop_reason":"end_turn"},"total_usd":0.206924,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"NEK9/Nercc1 directly phosphorylates NEK6 at Ser206 on its activation loop in vitro, causing 20-25-fold activation of NEK6 kinase activity; this phosphorylation also occurs in vivo during mitosis and is stimulated by co-expression with activated NEK9 mutant, establishing a NEK9→NEK6 mitotic kinase cascade.\",\n      \"method\": \"In vitro kinase assay with recombinant proteins, co-expression of activated NEK9 mutant with NEK6 in cells, mass spectrometry phosphosite identification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of direct phosphorylation with defined phosphosite, confirmed in vivo, replicated across multiple studies\",\n      \"pmids\": [\"12840024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NEK6 (and NEK7) were purified from rat liver as the major kinase activity phosphorylating the p70 S6 kinase hydrophobic motif site Thr412; recombinant NEK6 phosphorylates p70 S6K at Thr412 and activates it in vitro and in vivo synergistically with PDK1; kinase-inactive NEK6 interferes with insulin-induced p70 S6K activation.\",\n      \"method\": \"Biochemical purification from rat liver, in vitro kinase assay, co-expression/dominant-negative in cells\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical purification plus in vitro reconstitution plus cellular dominant-negative phenotype, replicated across multiple studies\",\n      \"pmids\": [\"11516946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NEK6 has a strong substrate specificity preference for Leu at the -3 position relative to the phosphorylation site; mutation of this Leu in S6K1 or SGK1 prevents their in vitro phosphorylation by NEK6, but these mutants are still phosphorylated at the hydrophobic motif in cells after IGF-1 stimulation, indicating NEK6 is NOT responsible for insulin/IGF-1-induced hydrophobic motif phosphorylation of S6K, SGK, or PKB in vivo.\",\n      \"method\": \"Peptide library (Jerini pepSTAR) kinetic analysis, in vitro phosphorylation of mutant S6K1/SGK1, transfected 293 cells with IGF-1 stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — substrate specificity defined by systematic peptide analysis plus mutagenesis validation in vitro and in vivo; negative result for physiological S6K phosphorylation replicated and confirmed\",\n      \"pmids\": [\"12023960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NEK6 is required for cell cycle progression through mitosis in human cells; inhibition of NEK6 by kinase-inactive mutant or siRNA causes metaphase arrest prior to apoptosis, as shown by time-lapse microscopy.\",\n      \"method\": \"siRNA knockdown, dominant-negative kinase-inactive mutant overexpression, time-lapse microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two orthogonal loss-of-function approaches (siRNA + dominant-negative), specific cell cycle arrest phenotype defined; replicated across multiple studies\",\n      \"pmids\": [\"14563848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NEK6 is constitutively associated with Eg5 (KIF11/Kinesin-5) and phosphorylates Eg5 at Ser1033 in vivo during mitosis primarily at spindle poles; this phosphorylation is required for full mitotic function of Eg5, as Eg5[Ser1033Ala] rescues only ~50% of cells depleted of Eg5 compared to wild-type, while a phosphomimetic Ser1033Asp rescues nearly as well as wild-type.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, phosphospecific antibody, rescue experiments with Eg5 point mutants in RNAi-depleted cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — constitutive interaction by Co-IP, in vitro phosphorylation, in vivo phosphosite validation, mutagenesis rescue experiment\",\n      \"pmids\": [\"19001501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NEK6 and NEK7 are both required for robust mitotic spindle formation and cytokinesis; depletion of either causes metaphase arrest with fragile spindles and apoptosis; NEK6 specifically localizes to spindle microtubules in metaphase/anaphase and to the midbody during cytokinesis, while NEK7 shows only spindle pole localization, demonstrating their non-redundant roles.\",\n      \"method\": \"siRNA depletion, dominant-negative mutant expression, antibody localization/immunofluorescence, SAC inhibitor combination experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal depletion phenotypes, multiple orthogonal approaches, specific localization; replicated across labs\",\n      \"pmids\": [\"19414596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PLK1 is identified as a direct activator of NEK9, which in turn activates NEK6/7; PLK1 controls prophase centrosome separation through NEK9 activation and subsequent NEK6/7-dependent phosphorylation of kinesin Eg5 at Ser1033, and the CDK1 site Thr926 together contribute to Eg5 centrosome accumulation and centrosome separation.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays, phosphospecific antibodies, siRNA depletion, rescue experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct kinase assay, epistasis established by sequential depletion and rescue, confirmed phosphosites with mutagenesis\",\n      \"pmids\": [\"21642957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DYNLL/LC8 binds to the Nek9 C-terminal region via a (K/R)XTQT motif, causing Nek9 multimerization and accelerating Nek9 autoactivation; LC8 binding to Nek9 is negatively regulated by Nek9 autophosphorylation at Ser944; LC8 binding also competitively interferes with Nek9-Nek6 interaction and Nek6 activation, acting as a regulatory brake on the Nek9→Nek6 cascade.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assays, mutagenesis of Nek9 phosphosite and binding motif\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reciprocal Co-IP, in vitro phosphorylation, binding motif mutagenesis, competition assay; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21454704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NEK6 interacts with STAT3 and phosphorylates STAT3 at Ser727, which is important for transcriptional activation; both Ser206 and Thr210 phosphorylation of NEK6 itself are required for this activity and for anchorage-independent transformation; NEK6 knockdown reduces colony formation and STAT3 Ser727 phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, NEK6 phosphosite mutants, siRNA knockdown, anchorage-independent growth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction, in vitro kinase assay, mutagenesis of NEK6 activation sites; single lab\",\n      \"pmids\": [\"20595392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NEK6 is phosphorylated upon IR and UV irradiation through the DNA damage checkpoint; Chk1 and Chk2 directly phosphorylate NEK6 in vitro; DNA damage abolishes NEK6 activation during mitosis; ectopic NEK6 overexpression overrides DNA damage-induced G2/M arrest, placing NEK6 downstream of the checkpoint kinases as a required effector.\",\n      \"method\": \"In vitro kinase assay with Chk1/Chk2, immunoprecipitation-kinase assay from irradiated cells, overexpression studies\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro phosphorylation by Chk1/Chk2, in vivo loss of activation, epistasis via overexpression; single lab\",\n      \"pmids\": [\"18728393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK6 phosphorylates Hsp72 at Thr66 within its nucleotide-binding domain, targeting it to the mitotic spindle; phosphorylated Hsp72 concentrates at spindle poles and kinetochore-microtubule attachment sites; Hsp72 promotes K-fiber assembly by facilitating ch-TOG and TACC3 interaction and their recruitment to spindle MTs; a phosphomimetic Hsp72 (T66D) rescues K-fiber defects, ch-TOG/TACC3 recruitment defects, and mitotic arrest caused by NEK6 depletion.\",\n      \"method\": \"In vitro kinase assay, phosphospecific antibody, siRNA depletion, phosphomimetic rescue, co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro phosphorylation plus phosphomimetic rescue experiment plus co-IP of substrate complex; multiple orthogonal methods in one study\",\n      \"pmids\": [\"25940345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human NEK6 is a monomeric, mostly globular kinase with a flexible, disordered N-terminal domain; SAXS reveals slightly elongated shape in solution; phosphorylation state affects NEK6 conformation (higher phosphorylation increases Stokes radius); the disordered N-terminal domain mediates interactions with diverse partners.\",\n      \"method\": \"SAXS, SEC-MALS, circular dichroism, homology modeling, thermal shift assay\",\n      \"journal\": \"BMC structural biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple biophysical methods for low-resolution structure; single lab, no functional mutagenesis to validate domain roles\",\n      \"pmids\": [\"21320329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NEK6 overexpression suppresses p53-induced senescence in a kinase-activity-dependent manner; kinase-dead NEK6 does not affect p53-induced senescence; NEK6 overexpression reduces cell cycle arrest in G1/G2M, maintains cyclin B and cdc2 levels, and inhibits ROS increases induced by p53.\",\n      \"method\": \"NEK6 overexpression and kinase-dead mutant in cancer cell lines, flow cytometry, Western blot for cyclin B/cdc2\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-dead control used to demonstrate activity-dependence, multiple readouts; single lab\",\n      \"pmids\": [\"21099361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NEK6 phosphorylates TPP1 (shelterin component) at Ser255 during G2/M phase; this phosphorylation regulates the association between telomerase activity and TPP1; POT1 negatively regulates TPP1 Ser255 phosphorylation; NEK6-TPP1 interaction was detected in human cells.\",\n      \"method\": \"Co-immunoprecipitation, phosphospecific antibody for TPP1 Ser255, cell synchronization, telomerase activity assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, in vivo phosphosite, functional readout (telomerase association); single lab, single study\",\n      \"pmids\": [\"27396482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEK6 and NEK7 phosphorylate EML4 at Ser144 and Ser146 within its basic N-terminal domain; these phosphorylations reduce EML4 affinity for the acidic C-terminal tails of α/β-tubulin on the microtubule surface; depletion of NEK6/7 increases EML4-microtubule binding in mitosis; EML4 S144A-S146A double mutant binds inappropriately to mitotic microtubules, stabilizes them, and impairs chromosome congression.\",\n      \"method\": \"In vitro kinase assay, microtubule sedimentation assay, cryo-EM 3D reconstruction, depletion by siRNA, EML4 phosphosite mutant analysis\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with defined phosphosites, cryo-EM structural analysis of binding interface, mutagenesis rescue, multiple orthogonal methods\",\n      \"pmids\": [\"31409757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEK6 and its upstream activators PLK1 and Aurora-A target Hsp72 to the poles of cells with amplified centrosomes, promoting centrosome clustering into pseudo-bipolar spindles; blocking Hsp72 or NEK6 triggers multipolar spindle formation only in cells with amplified centrosomes, not in normal cells.\",\n      \"method\": \"siRNA depletion, phosphospecific antibodies, immunofluorescence in cancer cells with amplified centrosomes vs. normal cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis via depletion, context-specific spindle phenotype; single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"28720575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK6 directly interacts with GBP-1, making NEK6 a component of the cytoskeletal gateway of drug resistance; NEK6 expression is induced by hypoxia in a HIF-1α-dependent manner in ovarian cancer cells.\",\n      \"method\": \"Far western blot for NEK6-GBP1 interaction, hypoxia treatment, HIF-1α silencing, overexpression/silencing of NEK6\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-method protein interaction (far western blot), limited mechanistic follow-up; single lab\",\n      \"pmids\": [\"26269749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Pin1 (peptidyl-prolyl isomerase) interacts with NEK6, as confirmed by GST pull-down and co-immunoprecipitation and immunofluorescence colocalization in cells.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, immunofluorescence colocalization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reciprocal Co-IP and pull-down but no functional characterization of the interaction; single lab\",\n      \"pmids\": [\"16476580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK6 interacts with Smad4 and over-expression of NEK6 suppresses TGFβ-mediated transcriptional activity in a kinase activity-dependent manner; NEK6 blocks nuclear translocation of Smad4 and suppresses TGFβ-induced cell growth arrest; NEK6 expression is itself regulated by TGFβ and hypoxia.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay for TGFβ transcriptional activity, subcellular fractionation for Smad4 localization, kinase-dead NEK6 mutant\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction, kinase-activity dependence confirmed by kinase-dead mutant, functional reporter assay; single lab\",\n      \"pmids\": [\"25523445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-325-3p upregulation after M. tuberculosis infection directly targets LNX1 (an E3 ubiquitin ligase of NEK6), reducing LNX1-mediated proteasomal degradation of NEK6; accumulated NEK6 activates STAT3 signaling, inhibiting macrophage apoptosis and promoting intracellular M. tuberculosis survival.\",\n      \"method\": \"miRNA target validation, LNX1 as E3 ligase for NEK6 demonstrated, STAT3 signaling readout, Mir325-deficient mice, macrophage cell and mouse models\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — LNX1 identified as E3 ubiquitin ligase for NEK6, miR-325-3p target validation, in vivo mouse model; single lab\",\n      \"pmids\": [\"32487755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phosphoproteome profiling identified transcription factor FOXJ2 as a novel NEK6 substrate in the context of castration resistance; NEK6 overexpression stimulates cytoskeletal, differentiation, and immune signaling gene expression programs.\",\n      \"method\": \"Phosphoproteome profiling, gene expression profiling, kinome screen\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — phosphoproteomics identifies substrate but direct kinase-substrate assay not described in abstract; single lab\",\n      \"pmids\": [\"27899381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NEK6 associates with and phosphorylates STAT3; NEK6 kinase activity is required for induction of GFAP and PCNA (markers of reactive astrogliosis); NEK6 is also localized in the nucleus and binds to STAT3-responsive genomic elements in astrocytes; NEK6 expression is rapidly induced after brain injury and promotes reactive astrogliosis.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, ChIP (binding to STAT3 genomic elements), immunofluorescence, loss-of-function/gain-of-function in astrocytes\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, kinase assay, ChIP for genomic binding; multiple orthogonal methods; single lab\",\n      \"pmids\": [\"34643969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NEK6 directly interacts with FOXO3 and phosphorylates it at Ser7 through kinase activity, inhibiting FOXO3 nuclear translocation; nuclear FOXO3 promotes FBXW7 transcription leading to c-MYC ubiquitination and suppression of de novo purine synthesis; NEK6-mediated inhibition of this pathway supports chemoresistance in ovarian cancer.\",\n      \"method\": \"Co-immunoprecipitation, in vitro/in vivo kinase assay for FOXO3-S7 phosphorylation, subcellular fractionation, reporter assay, xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Co-IP interaction, kinase assay with phosphosite, functional pathway readout; single lab\",\n      \"pmids\": [\"39256367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NEK6 phosphorylates FOXN3 at Ser412 and Ser416 in response to pro-fibrotic stimuli, leading to FOXN3 degradation; loss of FOXN3 inhibits β-TrCP-mediated ubiquitination of Smad4, stabilizing the Smad2/3/4 complex at chromatin and promoting transcriptional activation of pro-fibrotic genes, contributing to pulmonary fibrosis.\",\n      \"method\": \"In vitro kinase assay, phosphosite mutagenesis, co-immunoprecipitation, ChIP, ubiquitination assay, loss-of-function in cell and animal models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with defined phosphosites, ubiquitination assay, ChIP, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"39984467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A single amino acid residue distinguishes NEK6 from NEK7 in NLRP3 inflammasome activation: NEK7 Arg121 (vs NEK6 Gln132) mediates NLRP3 binding; substituting Gln132 with Arg in NEK6 confers NEK6 the ability to bind NLRP3 and activate the inflammasome in mouse macrophages; NEK6 does NOT support NLRP3 inflammasome activation under normal conditions.\",\n      \"method\": \"Point mutant co-immunoprecipitation, inflammasome activation assay in macrophages, mutagenesis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis defines single causative residue, functional assay in macrophages, Co-IP interaction validated; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35354613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NEK6 kinase stimulates LSD1 histone demethylase activity in cells; NEK6 phosphorylates LSD1 at the N-terminal intrinsically disordered region (IDR); NEK6 and LSD1 strongly colocalize at distinct chromatin sub-compartments (CSCs); LSD1 IDR shows phase separation behavior in vitro and in cells, and NEK6-mediated phosphorylation promotes LSD1 concentration at CSCs, supporting dynamic transcriptional control.\",\n      \"method\": \"Co-localization/co-immunoprecipitation, in vitro and in-cell kinase assay for LSD1 phosphorylation, phase separation assay, chromatin fractionation\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct kinase-substrate relationship, phase separation assay, chromatin co-localization; multiple methods but single lab\",\n      \"pmids\": [\"39523439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NEK6 binds to YBX1 in the cytoplasm and phosphorylates it at Ser102, promoting YBX1 nuclear translocation; nuclear YBX1 activates CDK2 and BCL2 transcription; NEK6 and CDK4/6 inhibition are synthetically lethal in endometrial cancer.\",\n      \"method\": \"Co-immunoprecipitation, phosphospecific assay, nuclear fractionation, CRISPR-Cas9 screen, in vitro and in vivo tumor models\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction, phosphosite on substrate, nuclear translocation readout, functional validation in vivo; single lab\",\n      \"pmids\": [\"41560755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEK6 knockout in DU-145 prostate cancer cells reduces mitochondrial respiration, causes mitochondrial fragmentation (reduced cristae), increases intracellular ROS, decreases antioxidant proteins (SOD1, SOD2, PRDX3), increases JNK phosphorylation and DNA damage markers, and reduces NF-κB2 nuclear localization; NEK6 overexpression increases antioxidant defenses.\",\n      \"method\": \"CRISPR-Cas9 knockout, Western blot, ROS assay, mitochondrial respiration assay, clonogenic assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knockout with multiple defined biochemical readouts, validated by reciprocal overexpression; single lab\",\n      \"pmids\": [\"36672191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NEK6 knockout in DU-145 prostate cancer cells causes mitochondrial morphological defects (fragmented phenotype with reduced cristae), reduced mitochondrial respiration, increased autophagic flux targeting mitochondria (mitophagy), altered fusion/fission regulators (decreased Long-OPA1:Short-OPA1 ratio and DRP1), and increased ER-mitochondria contacts.\",\n      \"method\": \"CRISPR-Cas9 knockout, transmission electron microscopy, Western blot, mitochondrial respiration assay, autophagy flux assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knockout with TEM ultrastructural analysis, multiple organelle readouts; single lab, single study\",\n      \"pmids\": [\"42193938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NEK6 binds TCP10L and promotes its ubiquitination and degradation; TCP10L negatively regulates glycolysis in hepatocellular carcinoma; NEK6-mediated TCP10L downregulation accelerates HCC proliferation, metastasis, and glycolysis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown rescue experiments\",\n      \"journal\": \"Critical reviews in eukaryotic gene expression\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and ubiquitination assay, single lab, limited mechanistic depth in abstract\",\n      \"pmids\": [\"40228222\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NEK6 is a mitotic serine/threonine kinase activated by NEK9/Nercc1 (itself activated by PLK1-CDK1) via direct phosphorylation of its activation loop Ser206; active NEK6 phosphorylates multiple mitotic substrates including kinesin Eg5 (Ser1033), EML4 (Ser144/146), and Hsp72 (Thr66) to promote bipolar spindle assembly, K-fiber stability, and centrosome separation/clustering; outside mitosis, NEK6 phosphorylates STAT3 (Ser727), FOXO3 (Ser7), YBX1 (Ser102), FOXN3 (Ser412/416), TPP1 (Ser255), and LSD1 to regulate transcription, senescence, telomere length, TGFβ/Smad signaling, and chemoresistance; NEK6 activity is negatively regulated during DNA damage via Chk1/Chk2 phosphorylation, and by DYNLL/LC8 competing with NEK6 binding to NEK9.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NEK6 is a serine/threonine kinase that functions as a terminal effector of a mitotic kinase cascade in which PLK1/CDK1 activate NEK9, and NEK9 in turn directly phosphorylates NEK6 on its activation-loop residue Ser206 to drive a 20-25-fold increase in NEK6 activity [#0, #6]. Activated NEK6 is required for progression through mitosis: its loss or inhibition produces metaphase arrest with fragile spindles followed by apoptosis [#3, #5]. Mechanistically, NEK6 localizes to spindle microtubules and the midbody and phosphorylates a set of mitotic substrates to build a functional bipolar spindle — Eg5/KIF11 at Ser1033 to promote centrosome separation [#4, #6], Hsp72 at Thr66 to target it to spindle poles and recruit the ch-TOG/TACC3 complex for K-fiber assembly [#10], and EML4 at Ser144/146 to release EML4 from mitotic microtubules and permit chromosome congression [#14]. The same cascade promotes centrosome clustering into pseudo-bipolar spindles in cells with amplified centrosomes [#15]. NEK6 activity is restrained during DNA damage, when Chk1 and Chk2 directly phosphorylate NEK6 to block its mitotic activation, and the cascade is further tuned by DYNLL/LC8, which competes with NEK6 for binding to NEK9 [#7, #9]. Beyond mitosis, NEK6 acts as a regulator of transcription-factor localization and stability in diverse settings: it phosphorylates and activates STAT3 at Ser727 [#8, #21], phosphorylates FOXO3 (Ser7) and FOXN3 (Ser412/416) to control their nuclear access and downstream ubiquitination programs [#22, #23], phosphorylates YBX1 (Ser102) to drive its nuclear translocation [#26], and stimulates LSD1 demethylase activity at chromatin sub-compartments [#25]. Through these activities NEK6 modulates p53-induced senescence, TGFβ/Smad signaling, telomere regulation via TPP1, and chemoresistance [#12, #13, #18, #22]. A single residue (Gln132 in NEK6 versus Arg121 in NEK7) explains why NEK6, unlike its paralog NEK7, does not support NLRP3 inflammasome activation [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established NEK6 as a bona fide protein kinase by purifying it biochemically as a major activity phosphorylating the p70 S6 kinase hydrophobic-motif site, giving the first candidate substrate.\",\n      \"evidence\": \"Biochemical purification from rat liver plus in vitro kinase assay and dominant-negative expression\",\n      \"pmids\": [\"11516946\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of S6K phosphorylation by NEK6 not yet resolved at this stage\", \"No cellular role defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined NEK6 substrate specificity (Leu at -3) and showed by mutagenesis that NEK6 is NOT the physiological insulin/IGF-1-induced hydrophobic-motif kinase for S6K/SGK/PKB, redirecting the search for its true biological function.\",\n      \"evidence\": \"Peptide-library kinetic analysis and mutant substrate phosphorylation in IGF-1-stimulated cells\",\n      \"pmids\": [\"12023960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Left NEK6's authentic in vivo substrates unidentified\", \"No connection to a cellular process yet\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Placed NEK6 in a defined activation cascade by demonstrating direct NEK9 phosphorylation of NEK6 at activation-loop Ser206, and independently showed NEK6 is required for mitotic progression.\",\n      \"evidence\": \"In vitro reconstitution with recombinant proteins, MS phosphosite mapping, and siRNA/dominant-negative phenotyping with time-lapse microscopy\",\n      \"pmids\": [\"12840024\", \"14563848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mitotic substrates of NEK6 still unknown\", \"Upstream activator of NEK9 not yet defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified the first mitotic substrate (Eg5 at Ser1033) and showed NEK6 is checkpoint-regulated, revealing both its effector function and how it is suppressed during DNA damage.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, phosphospecific antibodies, Eg5 mutant rescue; separately Chk1/Chk2 in vitro phosphorylation of NEK6 from irradiated cells\",\n      \"pmids\": [\"19001501\", \"18728393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Eg5-Ser1033-Ala only partially impaired, implying additional substrates\", \"Chk1/Chk2 phosphosites on NEK6 and mechanism of inhibition not mapped (Medium confidence for checkpoint arm)\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Distinguished NEK6 from its paralog NEK7 functionally, showing non-redundant localization (spindle MTs/midbody vs spindle poles) and separate requirements for spindle formation and cytokinesis.\",\n      \"evidence\": \"Reciprocal siRNA depletion, dominant-negative expression, and immunofluorescence localization\",\n      \"pmids\": [\"19414596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of distinct localization not defined\", \"Midbody substrate(s) unidentified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Completed the upstream wiring (PLK1→NEK9→NEK6/7→Eg5) and defined LC8/DYNLL as a competitive brake on the cascade, plus provided a low-resolution structural picture implicating the disordered N-terminus in partner binding.\",\n      \"evidence\": \"Kinase assays, sequential depletion/rescue epistasis, phosphosite mutagenesis, LC8 binding-motif mutagenesis; SAXS/SEC-MALS/CD for NEK6 architecture\",\n      \"pmids\": [\"21642957\", \"21454704\", \"21320329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution NEK6 structure absent\", \"Functional role of N-terminal disorder not validated by mutagenesis\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Elucidated how NEK6 builds K-fibers by phosphorylating Hsp72 at Thr66 to recruit the ch-TOG/TACC3 module, and extended NEK6 into non-mitotic signaling (TGFβ/Smad4, GBP-1/chemoresistance).\",\n      \"evidence\": \"In vitro kinase assay with phosphomimetic rescue and substrate-complex Co-IP for Hsp72; Co-IP/reporter assays for Smad4; far-western for GBP-1\",\n      \"pmids\": [\"25940345\", \"25523445\", \"26269749\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GBP-1 interaction rests on a single method (Low confidence)\", \"Direct Smad4 phosphorylation by NEK6 not demonstrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected NEK6/Hsp72 to centrosome clustering, showing a context-specific (amplified-centrosome) vulnerability where NEK6 loss forces multipolar spindles.\",\n      \"evidence\": \"siRNA depletion and phosphospecific immunofluorescence in cancer vs normal cells\",\n      \"pmids\": [\"28720575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited mechanistic detail on the clustering step\", \"No quantitative substrate-level analysis\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided structural-mechanistic understanding of how NEK6 (with NEK7) controls microtubule dynamics by phosphorylating EML4 at Ser144/146 to release it from the microtubule lattice, enabling chromosome congression.\",\n      \"evidence\": \"In vitro kinase assay, microtubule sedimentation, cryo-EM reconstruction of the binding interface, and phosphosite mutant analysis\",\n      \"pmids\": [\"31409757\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative NEK6 vs NEK7 contribution at this substrate not separated\", \"Timing/spatial control of EML4 phosphorylation in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the single-residue determinant (NEK6 Gln132 vs NEK7 Arg121) explaining NEK6's inability to bind NLRP3, and uncovered a mitochondrial/redox-homeostasis role through CRISPR knockout phenotypes.\",\n      \"evidence\": \"Point-mutant Co-IP and inflammasome assays in macrophages; CRISPR knockout with respiration, ROS, and antioxidant-protein readouts in prostate cancer cells\",\n      \"pmids\": [\"35354613\", \"36672191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mitochondrial substrate of NEK6 unidentified\", \"Mechanism linking NEK6 to antioxidant defense and NF-κB2 not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Consolidated NEK6 as a phosphorylation switch governing transcription-factor localization and stability across disease contexts — FOXO3 (Ser7), FOXN3 (Ser412/416), YBX1 (Ser102), STAT3, and LSD1 — linking it to chemoresistance, fibrosis, reactive astrogliosis, and tumor proliferation.\",\n      \"evidence\": \"Co-IP, in vitro/in-cell kinase assays with defined phosphosites, ChIP, ubiquitination assays, phase-separation assays, and xenograft/animal models across multiple studies\",\n      \"pmids\": [\"39256367\", \"39984467\", \"41560755\", \"34643969\", \"39523439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each transcription-factor substrate validated by single labs\", \"How mitotic and transcriptional NEK6 pools are spatially/temporally segregated is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single activation-loop-regulated kinase coordinates its many spatially distinct substrate pools (spindle, centrosome, nucleus, mitochondria) and what governs substrate selection in each compartment.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of active NEK6 with substrate\", \"No systematic in vivo substrate map distinguishing mitotic from interphase targets\", \"Compartment-specific activation/scaffolding mechanisms undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 8, 10, 14, 22, 23, 25, 26]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 4, 10, 14]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [21, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [26]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [27, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 5, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 21, 22, 23, 25, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 18, 22]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NEK9\", \"DYNLL1\", \"KIF11\", \"EML4\", \"STAT3\", \"FOXO3\", \"Smad4\", \"Pin1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}