{"gene":"NEK2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1994,"finding":"NEK2 protein kinase is cell cycle-regulated, accumulating progressively through S phase and peaking in late G2, being almost undetectable in G1, consistent with a role at the onset of mitosis.","method":"Cell synchronization (drug arrest and elutriation) + immunoblotting","journal":"Cell growth & differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — independently replicated across multiple labs using orthogonal synchronization methods","pmids":["7522034"],"is_preprint":false},{"year":1995,"finding":"Recombinant NEK2 functions as a serine/threonine-specific protein kinase capable of autophosphorylation; it phosphorylates beta-casein in vitro, and its substrate specificity overlaps with but is not identical to fungal NIMA.","method":"In vitro kinase assay with recombinant protein expressed in insect cells; synthetic peptide substrates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro biochemical reconstitution, replicated in subsequent studies","pmids":["7759549"],"is_preprint":false},{"year":2001,"finding":"NEK2A (but not NEK2B) is destroyed at mitotic entry via APC/C-Cdc20-mediated proteasomal degradation, dependent on a C-terminal extended D-box motif and a KEN-box; the C-terminal domain of NEK2A can inhibit APC/C-mediated destruction of both cyclins A and B.","method":"Cell-free degradation assays, mutagenesis of destruction motifs, immunodepletion, proteasome inhibitor studies","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical methods in one rigorous study, replicated by subsequent work","pmids":["11742988"],"is_preprint":false},{"year":2002,"finding":"Human NEK2 exists as two splice variants, NEK2A and NEK2B, that form homo- and hetero-dimers, both localize to centrosomes, but only NEK2A induces centrosome splitting upon overexpression; NEK2A disappears in prometaphase whereas NEK2B persists.","method":"RT-PCR, immunoblotting, antisense oligonucleotide knockdown, transfection/overexpression, immunofluorescence","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, replicated across labs","pmids":["11742531"],"is_preprint":false},{"year":2002,"finding":"NEK2 phosphorylates Hec1 at Ser165 both in vitro and in vivo during G2/M; Hec1 S165A mutation fails to rescue lethality from Hec1 deletion in yeast, demonstrating that NEK2-mediated phosphorylation of Hec1 is essential for chromosome segregation.","method":"In vitro kinase assay, in vivo phosphorylation, site-directed mutagenesis, yeast complementation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution, mutagenesis, and genetic rescue in one study","pmids":["12386167"],"is_preprint":false},{"year":2003,"finding":"Active NEK2A stimulates sustained splitting of interphase centrioles; kinase-dead NEK2A causes monopolar spindle formation with unseparated spindle poles, demonstrating that NEK2A kinase activity is required for centrosome disjunction and bipolar spindle formation in human cells.","method":"Tetracycline-inducible overexpression of wild-type and kinase-dead NEK2A; live cell imaging; immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative and gain-of-function approaches with live imaging, replicated across labs","pmids":["12857871"],"is_preprint":false},{"year":2003,"finding":"NEK2 directly phosphorylates HMGA2 in vitro and interacts with it in mouse spermatocytes; phosphorylation by NEK2 decreases HMGA2 affinity for DNA, potentially facilitating its release from chromatin during meiotic G2/M progression.","method":"In vitro kinase assay, co-immunoprecipitation from spermatocytes, chromatin fractionation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and in vitro kinase assay in single lab","pmids":["14668482"],"is_preprint":false},{"year":2004,"finding":"NEK2A interacts with MAD1 via a leucine zipper-containing C-terminal domain in vitro and in vivo; NEK2A localizes to kinetochores in mitosis and is required for MAD2 (but not MAD1) association with kinetochores; NEK2A knockdown causes premature chromosome segregation and impairs spindle checkpoint signaling.","method":"Co-immunoprecipitation, in vitro binding, siRNA knockdown, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional siRNA knockdown, single lab","pmids":["14978040"],"is_preprint":false},{"year":2004,"finding":"NEK2A interacts with Erk2 via a conserved docking site in the NEK2A C-terminus; NEK2A is required for centrosomal localization of Erk2 (RNAi depletion of NEK2A delocalizes Erk2 from centrosomes), but inhibition of Erk2 does not affect NEK2A localization.","method":"Co-immunoprecipitation, pull-down assay, siRNA knockdown, immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays plus loss-of-function localization, single lab","pmids":["15358203"],"is_preprint":false},{"year":2004,"finding":"NEK2A interacts with and phosphorylates Nek11 in the C-terminal non-catalytic region, stimulating Nek11 kinase activity by dissociating its autoinhibitory intramolecular interaction; autophosphorylation of NEK2A promotes its interaction with Nek11L at nucleoli in G1/S-arrested cells.","method":"Co-immunoprecipitation, pull-down with recombinant proteins, in vitro kinase assay, nucleolar localization experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase reconstitution and binding, single lab","pmids":["15161910"],"is_preprint":false},{"year":2004,"finding":"NEK2A kinase phosphorylates numatrin (B23/NPM1) and is required for numatrin's centrosomal localization in mitosis; siRNA depletion of NEK2A abolishes numatrin centrosomal association.","method":"Reciprocal co-immunoprecipitation, pull-down with recombinant proteins, in vitro kinase assay, siRNA knockdown with immunofluorescence","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, in vitro phosphorylation, and functional depletion, single lab","pmids":["15388344"],"is_preprint":false},{"year":2005,"finding":"NEK2 exists in cytoplasmic particles that traffic to the centrosome along microtubules; a motif in the Nek2 C-terminal non-catalytic domain mediates both microtubule binding and centrosome localization; PCM-1 (centriolar satellite component) is required for centrosomal recruitment of NEK2 and its substrate C-Nap1; 70% of centrosomal NEK2 turns over rapidly (t1/2 ~3 s by FRAP); localized proteasomal degradation is required for rapid centrosomal NEK2 replenishment.","method":"Live cell imaging, FRAP, immunofluorescence, PCM-1 depletion, microtubule-binding assay, mutagenesis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods including FRAP, live imaging, and functional mutagenesis in one study","pmids":["15659651"],"is_preprint":false},{"year":2005,"finding":"Nlp (ninein-like protein) is phosphorylated by NEK2 kinase; overexpression of active NEK2 prematurely displaces Nlp from interphase centrosomes independently of Plk1 phosphorylation sites on Nlp; active NEK2 stimulates Plk1 phosphorylation of Nlp in vitro, suggesting NEK2 primes Nlp for Plk1 phosphorylation at G2/M.","method":"In vitro kinase assay, overexpression of active/kinase-dead NEK2 and Plk1, immunofluorescence, Xenopus homolog characterization","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution plus in-cell functional assays, single lab","pmids":["15684383"],"is_preprint":false},{"year":2006,"finding":"NEK2A binds directly to the APC/C in a manner dependent on an exposed C-terminal methionine-arginine (MR) dipeptide, even in the absence of the adaptor Cdc20; this direct binding allows checkpoint-independent, prometaphase-specific degradation of NEK2A.","method":"In vitro binding assays to purified APC/C, peptide competition, C-terminal truncation and mutagenesis, cell-based degradation assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution with purified APC/C and mutagenesis, confirmed in cells","pmids":["16648845"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the NEK2 kinase domain in complex with a pyrrole-indolinone inhibitor at 2.2 Å reveals an inhibitory helical motif within the activation loop that creates a steric barrier to active enzyme formation; autophosphorylation sites identified by mass spectrometry have complex positive and negative regulatory effects on kinase activity correlated with centrosomal splitting efficiency.","method":"X-ray crystallography (2.2 Å), mass spectrometry, site-directed mutagenesis, in-cell centrosome splitting assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure plus mutagenesis and functional validation in one study","pmids":["17197699"],"is_preprint":false},{"year":2007,"finding":"NEK2A phosphorylates human Sgo1 at Ser14 and Ser507 in vitro; NEK2A co-distributes with HsSgo1 at kinetochores; expression of non-phosphorylatable Sgo1 causes microtubule attachment errors (syntelic and monotelic), demonstrating that NEK2A-mediated Sgo1 phosphorylation is required for faithful chromosome congression.","method":"In vitro kinase assay with 32P incorporation, co-immunoprecipitation, immunofluorescence, non-phosphorylatable mutant expression","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro phosphorylation with site mapping plus in-cell functional mutant, single lab","pmids":["17621308"],"is_preprint":false},{"year":2007,"finding":"PP1alpha (but not PP1gamma) specifically regulates NEK2 function; both isoforms co-immunoprecipitate with NEK2, but only PP1alpha mediates ionizing radiation-induced inhibition of NEK2 activity and centrosome splitting; this response is ATM-dependent and requires PP1 binding to the NEK2 PP1-binding motif outside the kinase domain.","method":"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown of PP1alpha, PP1-binding motif mutagenesis, ionizing radiation treatment","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific co-IP, mutagenesis, and siRNA knockdown, single lab","pmids":["17283141"],"is_preprint":false},{"year":2007,"finding":"Beta-catenin is a direct substrate of NEK2 kinase; NEK2 binds to and phosphorylates beta-catenin; beta-catenin localizes with rootletin between C-Nap1 puncta in interphase (dependent on C-Nap1 and rootletin); increased NEK2 activity disrupts rootletin-centrosome interaction and promotes binding of beta-catenin to rootletin-independent centrosomal sites required for centrosome separation.","method":"Co-immunoprecipitation, in vitro kinase assay, immunofluorescence, siRNA knockdown, overexpression","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro phosphorylation plus multiple co-IP and functional epistasis experiments","pmids":["18086858"],"is_preprint":false},{"year":2007,"finding":"Alternative splicing controls subcellular localization of NEK2: NEK2C is predominantly nuclear due to a strong bipartite nuclear localization sequence (NLS) spanning the splice junction; NEK2A has a weak NLS and distributes between nucleus and cytoplasm; NEK2B has no NLS and is cytoplasmic. All three share kinase activity, dimerization, PP1 interaction, and centrosome localization.","method":"Subcellular fractionation, immunofluorescence, NLS mutagenesis, kinase assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, NLS mutagenesis with functional validation","pmids":["17626005"],"is_preprint":false},{"year":2008,"finding":"NEK2A-mediated phosphorylation of Hec1 at Ser165 is required for faithful kinetochore–microtubule attachments; non-phosphorylatable Hec1(S165A) increases microtubule attachment errors; NEK2A phosphorylation of Hec1 increases the affinity of the Ndc80 complex for microtubules in vitro.","method":"Phospho-specific antibody, in vitro Ndc80 microtubule-binding reconstitution, expression of non-phosphorylatable mutant, immunofluorescence","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of microtubule binding plus functional mutant analysis, single lab","pmids":["18297113"],"is_preprint":false},{"year":2008,"finding":"Crystal structures of wild-type Nek2 kinase domain bound to ADP (1.55 Å) and T175A mutant reveal multiple conformations of the nucleotide-binding site and autoinhibitory mechanisms; mutagenesis tests proposed autoinhibition mechanisms and suggests dimerization-dependent allosteric regulation combined with autophosphorylation and PP1c activity.","method":"X-ray crystallography (1.55 Å), site-directed mutagenesis, comparison with Aurora-A and Cdk2 structures","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution structures with mutagenesis in one study, single lab","pmids":["19124027"],"is_preprint":false},{"year":2009,"finding":"Nek2 physically associates with Mad2 and Cdc20; Cdc20 localizes to centrosomes and spindle poles; both Mad2 and Cdc20 can be phosphorylated by Nek2 in vitro; overexpression of Nek2 enhances Mad2-induced mitotic delay.","method":"Co-immunoprecipitation, in vitro kinase assay, immunofluorescence, overexpression studies","journal":"Experimental and molecular pathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP and in vitro phosphorylation without site mapping, single lab","pmids":["20034488"],"is_preprint":false},{"year":2010,"finding":"Hippo pathway components Mst2 kinase and scaffold protein hSav1 directly interact with NEK2A and regulate its centrosomal localization and ability to phosphorylate C-Nap1 and rootletin; hSav1-Mst2-NEK2A and Eg5 constitute distinct but complementary pathways for centrosome disjunction.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, in vitro kinase assay, epistasis analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, in vitro kinase assay, and genetic epistasis with multiple knockdowns","pmids":["21076410"],"is_preprint":false},{"year":2010,"finding":"Kendrin (pericentrin) associates with NEK2A at centrosomes and inhibits NEK2A kinase activity in vitro in a dose-dependent manner through the Nek2A-binding region of kendrin; ectopic expression of this region reduces centrosome splitting at G2, indicating kendrin suppresses premature centrosome splitting by anchoring and inhibiting NEK2A.","method":"Co-immunoprecipitation, in vitro kinase inhibition assay with purified kendrin fragments, overexpression with centrosome splitting quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase inhibition assay plus in-cell functional validation, single lab","pmids":["20599736"],"is_preprint":false},{"year":2011,"finding":"Plk1 functions upstream of the Mst2-NEK2A module; Plk1 phosphorylates Mst2, which prevents PP1γ binding to the Mst2-NEK2A complex, thereby allowing NEK2A kinase activity to promote centrosome disjunction. Without Plk1-mediated Mst2 phosphorylation, PP1γ assembles into Nek2A-PP1γ-Mst2 complexes and counteracts NEK2A activity.","method":"Co-immunoprecipitation, in vitro kinase assay, Plk1 inhibition, siRNA knockdown, centrosome separation assays","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, kinase assays, and functional epistasis, single lab with multiple orthogonal methods","pmids":["21723128"],"is_preprint":false},{"year":2013,"finding":"NEK2 localizes to the nucleus of cancer cells, co-localizes in splicing speckles with SRSF1 and SRSF2, interacts with multiple splicing factors, and directly phosphorylates SRSF1; NEK2 overexpression affects SRSF1 splicing activity independently of SRPK1; NEK2 knockdown triggers pro-apoptotic splice variant expression and sensitizes cells to apoptosis.","method":"Immunofluorescence colocalization, co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, minigene splicing reporter assays, RT-PCR for endogenous targets","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP, in vitro phosphorylation, and splicing functional assays, single lab with multiple orthogonal methods","pmids":["24369428"],"is_preprint":false},{"year":2014,"finding":"NEK2 phosphorylates beta-catenin at N-terminal regulatory sites (same positions targeted by GSK3β: S33/S37/T41) as well as additional sites; NEK2 binding to beta-catenin inhibits beta-TrCP E3 ligase binding, preventing beta-catenin ubiquitination and degradation, leading to its stabilization and accumulation at mitotic centrosomes; Plk1 regulates this NEK2-mediated stabilization of beta-catenin.","method":"In vitro kinase assay, co-immunoprecipitation, ubiquitination assay, phospho-specific antibody, in vitro and cell-based assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of phosphorylation and ubiquitination inhibition with cell-based validation, single lab","pmids":["24501426"],"is_preprint":false},{"year":2015,"finding":"NEK2 co-localizes with Kif24 and phosphorylates it; NEK2-mediated phosphorylation stimulates Kif24 microtubule-depolymerizing activity, thereby promoting cilia disassembly and preventing cilia outgrowth in proliferating cells, independent of Aurora A and HDAC6.","method":"Co-localization, in vitro kinase assay, siRNA knockdown, ciliation quantification, rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro phosphorylation, functional rescue, and epistasis, single lab with multiple orthogonal methods","pmids":["26290419"],"is_preprint":false},{"year":2015,"finding":"Nek2 knockdown in Xenopus leads to a centriole defect at the left-right organizer; Nek2 overexpression causes premature ciliary resorption dependent on the tubulin deacetylase Hdac6; NEK2 interacts with Nup98 (a nucleoporin at the ciliary base) and this interaction regulates cilium resorption.","method":"Xenopus morpholino knockdown and overexpression, epistasis with Hippo pathway, genetic interaction with Hdac6, co-immunoprecipitation (Nek2-Nup98)","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in Xenopus plus co-IP for binding partner, single lab","pmids":["26493400"],"is_preprint":false},{"year":2015,"finding":"Cep68 is phosphorylated by NEK2 in vivo, which promotes Cep68 degradation at mitotic onset; the SCF complex (via beta-TrCP F-box component) also targets Cep68 for destruction at mitosis; the C-terminal 300–400 aa of Cep68 are required for interphase centrosome localization.","method":"In vivo phosphorylation assays, proteasome inhibitor treatment, SCF component co-immunoprecipitation, truncation/deletion analysis with immunofluorescence","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo phosphorylation and SCF co-IP with functional localization data, single lab","pmids":["25704143"],"is_preprint":false},{"year":2016,"finding":"DVL (Dishevelled) is a direct NEK2 substrate; NEK2 phosphorylates DVL at multiple residues, creating interfaces for binding to CDK5RAP2 and C-NAP1 at the centrosomal linker; NEK2-mediated DVL phosphorylation is coupled to dissolution of the centrosomal linker and centrosome separation; DVL depletion prevents NEK2-controlled linker dissolution; elevated DVL sequesters centrosomal NEK2 and mimics dominant-negative NEK2 phenotypes.","method":"Phospho-specific antibodies, co-immunoprecipitation, siRNA knockdown, overexpression, immunofluorescence centrosome separation assays","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — novel phospho-antibodies, reciprocal co-IP, and bidirectional functional genetics, single lab with multiple orthogonal methods","pmids":["27486244"],"is_preprint":false},{"year":2017,"finding":"NEK2 interacts with hnRNPA1/2 and regulates alternative splicing of PKM pre-mRNA by binding to the intronic sequence flanking exon 9; NEK2 promotes inclusion of exon 10 over exon 9, increasing the PKM2/PKM1 ratio and promoting aerobic glycolysis in multiple myeloma cells.","method":"Tandem affinity purification-mass spectrometry (TAP-MS), co-immunoprecipitation, RNA immunoprecipitation (RIP), Western blot, RT-PCR","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TAP-MS plus RIP and functional knockdown, single lab","pmids":["28086949"],"is_preprint":false},{"year":2017,"finding":"NEK2 forms a protein complex with EZH2 in glioma stem cells; NEK2 kinase activity phosphorylates EZH2 and protects it from ubiquitination-dependent proteasomal degradation, stabilizing EZH2 protein levels.","method":"Co-immunoprecipitation, ubiquitination assay, kinase-dead mutant rescue, siRNA knockdown, in vivo tumor models","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitination assay with kinase-dead control, single lab","pmids":["28737508"],"is_preprint":false},{"year":2018,"finding":"NEK2 is bound to the deubiquitinase USP7; USP7 binding prevents NEK2 ubiquitination, stabilizing NEK2 protein; increased NEK2 activates the canonical NF-κB signaling pathway through the PP1α/AKT axis; NEK2 also activates heparanase in an NF-κB-dependent manner.","method":"Tandem affinity purification-mass spectrometry (TAP-MS), co-immunoprecipitation, ubiquitination assay, kinase/pathway activity assays, xenograft models","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TAP-MS identification plus co-IP and functional pathway assays, single lab","pmids":["29863498"],"is_preprint":false},{"year":2020,"finding":"NEK2 kinase activity at the G2/M transition is required for displacement of distal appendages (DAs) from mother centrioles before mitosis; overexpression of active (but not kinase-dead) NEK2A prematurely displaces DAs; NEK2 knockout causes incomplete DA dissociation and retention of cilia remnants in mitosis, leading to asymmetric inheritance of ciliary signaling components.","method":"NEK2 knockout, overexpression of active and kinase-dead NEK2A, immunofluorescence, live imaging, quantification of DA markers at mitotic centrosomes","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO plus kinase-dead vs. active overexpression, multiple orthogonal methods, single lab","pmids":["32211891"],"is_preprint":false},{"year":2020,"finding":"NEK2 interacts with USP7 and Beclin-1; NEK2 interaction with USP7 decreases Beclin-1 ubiquitination, stabilizing Beclin-1 protein without affecting its phosphorylation; this NEK2/USP7/Beclin-1 complex activates autophagy in multiple myeloma cells, contributing to bortezomib resistance.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown of Beclin-1 and NEK2, in vitro and in vivo drug resistance assays","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, ubiquitination assay, and functional knockdown, single lab","pmids":["31955515"],"is_preprint":false},{"year":2020,"finding":"A unique binding mode allows NEK2A to be ubiquitinated by the APC/C-MCC complex in prometaphase: NEK2A binds the APC/C in a conformation-specific manner that allows it to access both UbcH10 and UbcH5 E2 enzymes, enabling efficient ubiquitination even while the spindle checkpoint is active.","method":"Biochemical reconstitution with purified APC/C and MCC, cryo-EM/structural analysis, in vitro ubiquitination assay, cell-based assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with structural analysis and functional validation, single lab","pmids":["32307883"],"is_preprint":false},{"year":2021,"finding":"NEK2 phosphorylates PD-L1 at T194 and T210 residues within the glycosylation-rich region of PD-L1 via a NEK binding motif (F/LXXS/T); this phosphorylation prevents ubiquitin-proteasome pathway-mediated degradation of PD-L1 in the ER lumen, stabilizing PD-L1 and promoting immune evasion in pancreatic cancer.","method":"Co-immunoprecipitation, in vitro kinase assay with phospho-site mapping, ubiquitination assay, siRNA knockdown, in vivo tumor-immune models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — phospho-site mutagenesis, ubiquitination assay, and in vivo functional validation, single lab with multiple orthogonal methods","pmids":["34315872"],"is_preprint":false},{"year":2022,"finding":"NEK2 directly phosphorylates NIK (NF-κB-inducing kinase), increasing NIK activity and stability, thereby activating the non-canonical NF-κB signaling pathway; this promotes glioblastoma progression.","method":"High-throughput RNA sequencing, co-immunoprecipitation, in vitro phosphorylation assay, siRNA knockdown, xenograft tumor models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and in vitro phosphorylation with functional in vivo validation, single lab","pmids":["35031599"],"is_preprint":false},{"year":2022,"finding":"NEK2 interacts with YAP1 and phosphorylates it at Thr-143, preventing YAP1 ubiquitination and proteasomal degradation; this stabilization of YAP1 by NEK2 promotes ESCC cell migration and invasion.","method":"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (T143 phosphorylation site), cycloheximide chase, in vivo xenograft","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, mutagenesis, and ubiquitination assay with functional validation, single lab","pmids":["35705994"],"is_preprint":false},{"year":2002,"finding":"p90Rsk2, activated by the MAPK/Erk1 pathway, directly phosphorylates the NEK2 kinase domain in vitro and stimulates NEK2 kinase activity in spermatocyte extracts; inhibition of the MAPK pathway (MEK inhibitor U0126) suppresses NEK2 activation during meiotic G2/M progression, placing NEK2 downstream of Erk1/p90Rsk2 in chromosome condensation.","method":"In vitro kinase assay, spermatocyte cell extracts, MEK inhibitor treatment, okadaic acid-induced G2/M progression","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro phosphorylation plus chemical genetic epistasis, single lab","pmids":["11923207"],"is_preprint":false},{"year":2016,"finding":"In Drosophila, APC/C(Fzr/Cdh1) negatively regulates Nek2 kinase as a direct substrate; Nek2 phosphorylates Dishevelled (Dsh); this APC/C→Nek2→Dsh pathway controls Dsh levels and localization required for planar cell polarity (PCP) establishment.","method":"Drosophila genetics, epistasis analysis, in vitro kinase assay (Nek2 phosphorylating Dsh), loss-of-function and gain-of-function in PCP assays","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis plus in vitro kinase assay in Drosophila model, single lab","pmids":["28041906"],"is_preprint":false}],"current_model":"NEK2 is a centrosomal serine/threonine kinase that peaks in late G2, phosphorylates centrosomal linker proteins (C-Nap1, rootletin, beta-catenin, Nlp, DVL, Cep68) to trigger centrosome disjunction and bipolar spindle formation, is regulated upstream by Plk1/Mst2/hSav1 and counteracted by PP1alpha/PP1gamma, undergoes checkpoint-independent APC/C-Cdc20-mediated proteasomal destruction in prometaphase via a direct MR-dipeptide interaction with the APC/C, and additionally functions as a nuclear splicing factor kinase (phosphorylating SRSF1), a regulator of cilia disassembly (via Kif24 phosphorylation and distal appendage displacement), and a stabilizer of oncogenic proteins (EZH2, YAP1, PD-L1, Beclin-1) through phosphorylation-dependent inhibition of their ubiquitination."},"narrative":{"mechanistic_narrative":"NEK2 is a cell cycle-regulated serine/threonine kinase that accumulates through S phase, peaks in late G2, and drives centrosome disjunction at the onset of mitosis [PMID:7522034, PMID:7759549, PMID:12857871]. Its kinase activity is essential for splitting the interphase centrosome and forming a bipolar spindle, as kinase-dead NEK2A produces monopolar spindles with unseparated poles [PMID:12857871]. NEK2 executes disjunction by phosphorylating components of the intercentriolar linker and associated factors—beta-catenin, Nlp, DVL, and Cep68—thereby dissolving the linker and displacing it from centrosomes [PMID:15684383, PMID:18086858, PMID:25704143, PMID:27486244]. Upstream control integrates the Hippo and Plk1 pathways: Mst2 and the scaffold hSav1 bind NEK2A and license its activity, while Plk1 phosphorylates Mst2 to exclude inhibitory PP1γ from the complex; PP1α conversely suppresses NEK2 in an ATM-dependent manner following DNA damage [PMID:17283141, PMID:21076410, PMID:21723128]. Beyond pole separation, NEK2A localizes to kinetochores and phosphorylates Hec1/Ndc80 at Ser165 to strengthen kinetochore–microtubule attachment and ensure faithful chromosome segregation [PMID:12386167, PMID:18297113]. NEK2A is held in check by checkpoint-independent destruction in prometaphase: it binds the APC/C directly through an exposed C-terminal MR dipeptide and is ubiquitinated even while the spindle checkpoint is active, using a binding mode that accesses both UbcH10 and UbcH5 E2 enzymes [PMID:11742988, PMID:16648845, PMID:32307883]. Alternative splicing generates NEK2A, NEK2B, and a predominantly nuclear NEK2C variant differing in destruction motifs and nuclear localization signals [PMID:11742531, PMID:17626005]. In the nucleus, NEK2 acts as a splicing-factor kinase, colocalizing with and phosphorylating SRSF1 to modulate splicing and apoptotic sensitivity [PMID:24369428]. NEK2 also governs cilia disassembly by phosphorylating Kif24 to stimulate its microtubule-depolymerizing activity and by driving distal-appendage displacement from mother centrioles at G2/M [PMID:26290419, PMID:32211891]. In cancer, NEK2 stabilizes oncogenic proteins by phosphorylation-dependent inhibition of their ubiquitination, including beta-catenin, EZH2, YAP1, PD-L1, and Beclin-1 [PMID:24501426, PMID:28737508, PMID:34315872, PMID:35705994, PMID:31955515].","teleology":[{"year":1994,"claim":"Establishing when NEK2 acts in the cell cycle was prerequisite to assigning a function; periodic accumulation peaking in late G2 placed it at mitotic onset.","evidence":"Cell synchronization and immunoblotting across the cell cycle","pmids":["7522034"],"confidence":"High","gaps":["Does not identify substrates","Does not establish a mechanism of cell cycle regulation"]},{"year":1995,"claim":"Defining NEK2 as a bona fide serine/threonine kinase capable of autophosphorylation established the biochemical basis for all downstream substrate work.","evidence":"In vitro kinase assay with recombinant protein and peptide substrates","pmids":["7759549"],"confidence":"High","gaps":["No physiological substrate identified","Beta-casein is a generic in vitro substrate"]},{"year":2003,"claim":"Distinguishing the centrosome-splitting NEK2A from NEK2B and showing kinase activity is required for disjunction defined the core cellular function.","evidence":"Splice-variant analysis, overexpression, and wild-type vs. kinase-dead live imaging","pmids":["11742531","12857871"],"confidence":"High","gaps":["Did not identify the linker substrates dissolved during splitting","Does not explain how kinase activity is spatially restricted"]},{"year":2002,"claim":"Discovery that NEK2A is destroyed at mitotic entry via APC/C-Cdc20 through a D-box and KEN-box explained why active kinase is restricted to G2/prophase.","evidence":"Cell-free degradation assays and destruction-motif mutagenesis","pmids":["11742988"],"confidence":"High","gaps":["Did not resolve how degradation occurs independent of the spindle checkpoint","Mechanism of direct APC/C engagement unresolved at this stage"]},{"year":2006,"claim":"Showing NEK2A binds APC/C directly via a C-terminal MR dipeptide independent of Cdc20 explained its checkpoint-independent prometaphase destruction.","evidence":"In vitro binding to purified APC/C, peptide competition, and mutagenesis","pmids":["16648845"],"confidence":"High","gaps":["Did not resolve E2 enzyme requirements during active checkpoint"]},{"year":2020,"claim":"Defining a conformation-specific APC/C binding mode that recruits both UbcH10 and UbcH5 E2 enzymes explained how NEK2A is ubiquitinated even while the checkpoint is on.","evidence":"Reconstitution with purified APC/C-MCC, structural analysis, and in vitro ubiquitination","pmids":["32307883"],"confidence":"High","gaps":["Does not address in vivo dynamics of destruction relative to centrosome separation"]},{"year":2002,"claim":"Demonstrating NEK2 phosphorylates Hec1 at Ser165 and that this is essential for viability linked NEK2 directly to chromosome segregation, later mechanistically tied to Ndc80–microtubule affinity.","evidence":"In vitro kinase assay, site mutagenesis, yeast complementation, and in vitro Ndc80–microtubule binding reconstitution","pmids":["12386167","18297113"],"confidence":"High","gaps":["Does not establish how kinetochore-localized NEK2A is regulated relative to the centrosomal pool"]},{"year":2005,"claim":"Mapping how NEK2 reaches the centrosome—microtubule trafficking, PCM-1-dependent recruitment, and rapid local turnover—explained its spatial control at the centrosome.","evidence":"Live imaging, FRAP, PCM-1 depletion, and microtubule-binding mutagenesis","pmids":["15659651"],"confidence":"High","gaps":["Does not define how local proteasomal turnover is targeted","Recruitment signal that triggers activation unclear"]},{"year":2007,"claim":"Identifying beta-catenin as a direct linker-associated substrate, and later that NEK2 phosphorylation blocks beta-TrCP-mediated degradation, unified centrosome disjunction with a substrate-stabilization mechanism.","evidence":"In vitro kinase assays, co-IP, ubiquitination assays, and centrosomal epistasis","pmids":["18086858","24501426"],"confidence":"High","gaps":["Relationship between centrosomal beta-catenin and canonical Wnt signaling not resolved"]},{"year":2006,"claim":"Crystal structures revealed an autoinhibitory activation-loop helix and dimerization-dependent allosteric regulation, defining how NEK2 catalytic activity is switched on.","evidence":"X-ray crystallography (2.2 Å and 1.55 Å), mass spectrometry of autophosphorylation sites, and mutagenesis","pmids":["17197699","19124027"],"confidence":"High","gaps":["Structures do not capture the active full-length dimer","In vivo activating phosphorylations incompletely mapped"]},{"year":2010,"claim":"Placing NEK2A downstream of Mst2/hSav1 and, in turn, Plk1—with PP1γ as the counteracting phosphatase—built the upstream regulatory circuit governing disjunction timing.","evidence":"Co-IP, in vitro kinase assays, siRNA epistasis, and Plk1 inhibition","pmids":["21076410","21723128"],"confidence":"High","gaps":["How the Eg5 and Mst2-NEK2A pathways are coordinated remains unresolved"]},{"year":2016,"claim":"Identifying DVL as a NEK2 substrate that scaffolds linker proteins and whose phosphorylation drives linker dissolution mechanistically connected NEK2 to centrosome separation, with conservation in Drosophila PCP.","evidence":"Phospho-specific antibodies, co-IP, bidirectional genetics, and Drosophila epistasis with in vitro kinase assay","pmids":["27486244","28041906"],"confidence":"High","gaps":["Cross-talk between centrosomal DVL phosphorylation and Wnt/PCP signaling pools not delineated"]},{"year":2013,"claim":"Showing nuclear NEK2 colocalizes with and phosphorylates SRSF1 to modulate splicing extended NEK2 function beyond the centrosome to RNA processing and apoptotic control.","evidence":"Colocalization, co-IP, in vitro kinase assay, and minigene splicing reporters","pmids":["24369428"],"confidence":"High","gaps":["Genome-wide splicing targets not defined","Relationship to SRPK1 regulation incomplete"]},{"year":2015,"claim":"Demonstrating NEK2 phosphorylates Kif24 and drives distal-appendage displacement defined its role in cilia disassembly and asymmetric ciliary inheritance.","evidence":"In vitro kinase assay, ciliation rescue, NEK2 knockout, and distal-appendage marker quantification","pmids":["26290419","32211891"],"confidence":"High","gaps":["How NEK2 ciliary and centrosomal functions are temporally partitioned is unresolved"]},{"year":2021,"claim":"A recurring oncogenic theme emerged in which NEK2 phosphorylates client proteins (EZH2, YAP1, PD-L1, Beclin-1) to block their ubiquitination and stabilize them, linking NEK2 to immune evasion, drug resistance, and tumor progression.","evidence":"Co-IP, ubiquitination assays, phospho-site mutagenesis, and in vivo tumor models across cancer types","pmids":["28737508","35705994","34315872","31955515"],"confidence":"Medium","gaps":["Most client-stabilization findings rest on single labs","Whether a common phospho-degron-masking mechanism applies across substrates is not established"]},{"year":null,"claim":"How NEK2's many functions—centrosome disjunction, kinetochore attachment, splicing, cilia disassembly, and oncoprotein stabilization—are coordinated by a single kinase across compartments and cell cycle phases remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model linking nuclear, centrosomal, and ciliary substrate selection","Spatiotemporal logic of substrate choice undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,4,12,17,25,27,37]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,4,17,26,37]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[25,31]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,5,11,17,22]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,25]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[9,10]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[25]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[27,34]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,2,5,13,22,36]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[25,31]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[27,34]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,13,26,32,37]}],"complexes":["APC/C (substrate-bound)","Mst2-hSav1-NEK2A","NEK2A-PP1γ-Mst2"],"partners":["MST2","SAV1","PLK1","PPP1CA","DVL","CTNNB1","USP7","SRSF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P51955","full_name":"Serine/threonine-protein kinase Nek2","aliases":["HSPK 21","Never in mitosis A-related kinase 2","NimA-related protein kinase 2","NimA-like protein kinase 1"],"length_aa":445,"mass_kda":51.8,"function":"Protein kinase which is involved in the control of centrosome separation and bipolar spindle formation in mitotic cells and chromatin condensation in meiotic cells. Regulates centrosome separation (essential for the formation of bipolar spindles and high-fidelity chromosome separation) by phosphorylating centrosomal proteins such as CROCC, CEP250 and NINL, resulting in their displacement from the centrosomes. Regulates kinetochore microtubule attachment stability in mitosis via phosphorylation of NDC80. Involved in regulation of mitotic checkpoint protein complex via phosphorylation of CDC20 and MAD2L1. Plays an active role in chromatin condensation during the first meiotic division through phosphorylation of HMGA2. Phosphorylates: PPP1CC; SGO1; NECAB3 and NPM1. Essential for localization of MAD2L1 to kinetochore and MAPK1 and NPM1 to the centrosome. Phosphorylates CEP68 and CNTLN directly or indirectly (PubMed:24554434). NEK2-mediated phosphorylation of CEP68 promotes CEP68 dissociation from the centrosome and its degradation at the onset of mitosis (PubMed:25704143). Involved in the regulation of centrosome disjunction (PubMed:26220856). Phosphorylates CCDC102B either directly or indirectly which causes CCDC102B to dissociate from the centrosome and allows for centrosome separation (PubMed:30404835) Phosphorylates and activates NEK11 in G1/S-arrested cells Not present in the nucleolus and, in contrast to isoform 1, does not phosphorylate and activate NEK11 in G1/S-arrested cells","subcellular_location":"Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/P51955/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NEK2","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ANAPC16","stoichiometry":10.0},{"gene":"ANAPC2","stoichiometry":4.0},{"gene":"ANAPC4","stoichiometry":4.0},{"gene":"CDC16","stoichiometry":4.0},{"gene":"CDC23","stoichiometry":4.0},{"gene":"CDC26","stoichiometry":0.2},{"gene":"CDC27","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NEK2","total_profiled":1310},"omim":[{"mim_id":"618898","title":"CENTROSOMAL PROTEIN, 85-KD; CEP85","url":"https://www.omim.org/entry/618898"},{"mim_id":"617720","title":"PROTEIN PHOSPHATASE 1, REGULATORY SUBUNIT 42; PPP1R42","url":"https://www.omim.org/entry/617720"},{"mim_id":"616889","title":"CENTROSOMAL PROTEIN, 68-KD; CEP68","url":"https://www.omim.org/entry/616889"},{"mim_id":"616731","title":"NIMA-RELATED KINASE 5; NEK5","url":"https://www.omim.org/entry/616731"},{"mim_id":"615776","title":"CILIARY ROOTLET COILED-COIL PROTEIN; CROCC","url":"https://www.omim.org/entry/615776"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Centrosome","reliability":"Supported"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":16.7},{"tissue":"lymphoid tissue","ntpm":17.9},{"tissue":"testis","ntpm":62.8}],"url":"https://www.proteinatlas.org/search/NEK2"},"hgnc":{"alias_symbol":["NLK1","NEK2A","RP67","PPP1R111"],"prev_symbol":[]},"alphafold":{"accession":"P51955","domains":[{"cath_id":"3.30.200.20","chopping":"2-46_68-89","consensus_level":"medium","plddt":90.5045,"start":2,"end":89},{"cath_id":"1.10.510.10","chopping":"90-288","consensus_level":"high","plddt":85.9755,"start":90,"end":288}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51955","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51955-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51955-F1-predicted_aligned_error_v6.png","plddt_mean":78.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NEK2","jax_strain_url":"https://www.jax.org/strain/search?query=NEK2"},"sequence":{"accession":"P51955","fasta_url":"https://rest.uniprot.org/uniprotkb/P51955.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51955/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51955"}},"corpus_meta":[{"pmid":"12857871","id":"PMC_12857871","title":"Nek2A 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it phosphorylates beta-casein in vitro, and its substrate specificity overlaps with but is not identical to fungal NIMA.\",\n      \"method\": \"In vitro kinase assay with recombinant protein expressed in insect cells; synthetic peptide substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro biochemical reconstitution, replicated in subsequent studies\",\n      \"pmids\": [\"7759549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NEK2A (but not NEK2B) is destroyed at mitotic entry via APC/C-Cdc20-mediated proteasomal degradation, dependent on a C-terminal extended D-box motif and a KEN-box; the C-terminal domain of NEK2A can inhibit APC/C-mediated destruction of both cyclins A and B.\",\n      \"method\": \"Cell-free degradation assays, mutagenesis of destruction motifs, immunodepletion, proteasome inhibitor studies\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical methods in one rigorous study, replicated by subsequent work\",\n      \"pmids\": [\"11742988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human NEK2 exists as two splice variants, NEK2A and NEK2B, that form homo- and hetero-dimers, both localize to centrosomes, but only NEK2A induces centrosome splitting upon overexpression; NEK2A disappears in prometaphase whereas NEK2B persists.\",\n      \"method\": \"RT-PCR, immunoblotting, antisense oligonucleotide knockdown, transfection/overexpression, immunofluorescence\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, replicated across labs\",\n      \"pmids\": [\"11742531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NEK2 phosphorylates Hec1 at Ser165 both in vitro and in vivo during G2/M; Hec1 S165A mutation fails to rescue lethality from Hec1 deletion in yeast, demonstrating that NEK2-mediated phosphorylation of Hec1 is essential for chromosome segregation.\",\n      \"method\": \"In vitro kinase assay, in vivo phosphorylation, site-directed mutagenesis, yeast complementation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution, mutagenesis, and genetic rescue in one study\",\n      \"pmids\": [\"12386167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Active NEK2A stimulates sustained splitting of interphase centrioles; kinase-dead NEK2A causes monopolar spindle formation with unseparated spindle poles, demonstrating that NEK2A kinase activity is required for centrosome disjunction and bipolar spindle formation in human cells.\",\n      \"method\": \"Tetracycline-inducible overexpression of wild-type and kinase-dead NEK2A; live cell imaging; immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative and gain-of-function approaches with live imaging, replicated across labs\",\n      \"pmids\": [\"12857871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NEK2 directly phosphorylates HMGA2 in vitro and interacts with it in mouse spermatocytes; phosphorylation by NEK2 decreases HMGA2 affinity for DNA, potentially facilitating its release from chromatin during meiotic G2/M progression.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation from spermatocytes, chromatin fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and in vitro kinase assay in single lab\",\n      \"pmids\": [\"14668482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NEK2A interacts with MAD1 via a leucine zipper-containing C-terminal domain in vitro and in vivo; NEK2A localizes to kinetochores in mitosis and is required for MAD2 (but not MAD1) association with kinetochores; NEK2A knockdown causes premature chromosome segregation and impairs spindle checkpoint signaling.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional siRNA knockdown, single lab\",\n      \"pmids\": [\"14978040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NEK2A interacts with Erk2 via a conserved docking site in the NEK2A C-terminus; NEK2A is required for centrosomal localization of Erk2 (RNAi depletion of NEK2A delocalizes Erk2 from centrosomes), but inhibition of Erk2 does not affect NEK2A localization.\",\n      \"method\": \"Co-immunoprecipitation, pull-down assay, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays plus loss-of-function localization, single lab\",\n      \"pmids\": [\"15358203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NEK2A interacts with and phosphorylates Nek11 in the C-terminal non-catalytic region, stimulating Nek11 kinase activity by dissociating its autoinhibitory intramolecular interaction; autophosphorylation of NEK2A promotes its interaction with Nek11L at nucleoli in G1/S-arrested cells.\",\n      \"method\": \"Co-immunoprecipitation, pull-down with recombinant proteins, in vitro kinase assay, nucleolar localization experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase reconstitution and binding, single lab\",\n      \"pmids\": [\"15161910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NEK2A kinase phosphorylates numatrin (B23/NPM1) and is required for numatrin's centrosomal localization in mitosis; siRNA depletion of NEK2A abolishes numatrin centrosomal association.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, pull-down with recombinant proteins, in vitro kinase assay, siRNA knockdown with immunofluorescence\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, in vitro phosphorylation, and functional depletion, single lab\",\n      \"pmids\": [\"15388344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NEK2 exists in cytoplasmic particles that traffic to the centrosome along microtubules; a motif in the Nek2 C-terminal non-catalytic domain mediates both microtubule binding and centrosome localization; PCM-1 (centriolar satellite component) is required for centrosomal recruitment of NEK2 and its substrate C-Nap1; 70% of centrosomal NEK2 turns over rapidly (t1/2 ~3 s by FRAP); localized proteasomal degradation is required for rapid centrosomal NEK2 replenishment.\",\n      \"method\": \"Live cell imaging, FRAP, immunofluorescence, PCM-1 depletion, microtubule-binding assay, mutagenesis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods including FRAP, live imaging, and functional mutagenesis in one study\",\n      \"pmids\": [\"15659651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Nlp (ninein-like protein) is phosphorylated by NEK2 kinase; overexpression of active NEK2 prematurely displaces Nlp from interphase centrosomes independently of Plk1 phosphorylation sites on Nlp; active NEK2 stimulates Plk1 phosphorylation of Nlp in vitro, suggesting NEK2 primes Nlp for Plk1 phosphorylation at G2/M.\",\n      \"method\": \"In vitro kinase assay, overexpression of active/kinase-dead NEK2 and Plk1, immunofluorescence, Xenopus homolog characterization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution plus in-cell functional assays, single lab\",\n      \"pmids\": [\"15684383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NEK2A binds directly to the APC/C in a manner dependent on an exposed C-terminal methionine-arginine (MR) dipeptide, even in the absence of the adaptor Cdc20; this direct binding allows checkpoint-independent, prometaphase-specific degradation of NEK2A.\",\n      \"method\": \"In vitro binding assays to purified APC/C, peptide competition, C-terminal truncation and mutagenesis, cell-based degradation assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution with purified APC/C and mutagenesis, confirmed in cells\",\n      \"pmids\": [\"16648845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the NEK2 kinase domain in complex with a pyrrole-indolinone inhibitor at 2.2 Å reveals an inhibitory helical motif within the activation loop that creates a steric barrier to active enzyme formation; autophosphorylation sites identified by mass spectrometry have complex positive and negative regulatory effects on kinase activity correlated with centrosomal splitting efficiency.\",\n      \"method\": \"X-ray crystallography (2.2 Å), mass spectrometry, site-directed mutagenesis, in-cell centrosome splitting assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure plus mutagenesis and functional validation in one study\",\n      \"pmids\": [\"17197699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NEK2A phosphorylates human Sgo1 at Ser14 and Ser507 in vitro; NEK2A co-distributes with HsSgo1 at kinetochores; expression of non-phosphorylatable Sgo1 causes microtubule attachment errors (syntelic and monotelic), demonstrating that NEK2A-mediated Sgo1 phosphorylation is required for faithful chromosome congression.\",\n      \"method\": \"In vitro kinase assay with 32P incorporation, co-immunoprecipitation, immunofluorescence, non-phosphorylatable mutant expression\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphorylation with site mapping plus in-cell functional mutant, single lab\",\n      \"pmids\": [\"17621308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PP1alpha (but not PP1gamma) specifically regulates NEK2 function; both isoforms co-immunoprecipitate with NEK2, but only PP1alpha mediates ionizing radiation-induced inhibition of NEK2 activity and centrosome splitting; this response is ATM-dependent and requires PP1 binding to the NEK2 PP1-binding motif outside the kinase domain.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown of PP1alpha, PP1-binding motif mutagenesis, ionizing radiation treatment\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific co-IP, mutagenesis, and siRNA knockdown, single lab\",\n      \"pmids\": [\"17283141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Beta-catenin is a direct substrate of NEK2 kinase; NEK2 binds to and phosphorylates beta-catenin; beta-catenin localizes with rootletin between C-Nap1 puncta in interphase (dependent on C-Nap1 and rootletin); increased NEK2 activity disrupts rootletin-centrosome interaction and promotes binding of beta-catenin to rootletin-independent centrosomal sites required for centrosome separation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, immunofluorescence, siRNA knockdown, overexpression\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro phosphorylation plus multiple co-IP and functional epistasis experiments\",\n      \"pmids\": [\"18086858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Alternative splicing controls subcellular localization of NEK2: NEK2C is predominantly nuclear due to a strong bipartite nuclear localization sequence (NLS) spanning the splice junction; NEK2A has a weak NLS and distributes between nucleus and cytoplasm; NEK2B has no NLS and is cytoplasmic. All three share kinase activity, dimerization, PP1 interaction, and centrosome localization.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, NLS mutagenesis, kinase assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, NLS mutagenesis with functional validation\",\n      \"pmids\": [\"17626005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NEK2A-mediated phosphorylation of Hec1 at Ser165 is required for faithful kinetochore–microtubule attachments; non-phosphorylatable Hec1(S165A) increases microtubule attachment errors; NEK2A phosphorylation of Hec1 increases the affinity of the Ndc80 complex for microtubules in vitro.\",\n      \"method\": \"Phospho-specific antibody, in vitro Ndc80 microtubule-binding reconstitution, expression of non-phosphorylatable mutant, immunofluorescence\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of microtubule binding plus functional mutant analysis, single lab\",\n      \"pmids\": [\"18297113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structures of wild-type Nek2 kinase domain bound to ADP (1.55 Å) and T175A mutant reveal multiple conformations of the nucleotide-binding site and autoinhibitory mechanisms; mutagenesis tests proposed autoinhibition mechanisms and suggests dimerization-dependent allosteric regulation combined with autophosphorylation and PP1c activity.\",\n      \"method\": \"X-ray crystallography (1.55 Å), site-directed mutagenesis, comparison with Aurora-A and Cdk2 structures\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution structures with mutagenesis in one study, single lab\",\n      \"pmids\": [\"19124027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nek2 physically associates with Mad2 and Cdc20; Cdc20 localizes to centrosomes and spindle poles; both Mad2 and Cdc20 can be phosphorylated by Nek2 in vitro; overexpression of Nek2 enhances Mad2-induced mitotic delay.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, immunofluorescence, overexpression studies\",\n      \"journal\": \"Experimental and molecular pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP and in vitro phosphorylation without site mapping, single lab\",\n      \"pmids\": [\"20034488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Hippo pathway components Mst2 kinase and scaffold protein hSav1 directly interact with NEK2A and regulate its centrosomal localization and ability to phosphorylate C-Nap1 and rootletin; hSav1-Mst2-NEK2A and Eg5 constitute distinct but complementary pathways for centrosome disjunction.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, in vitro kinase assay, epistasis analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, in vitro kinase assay, and genetic epistasis with multiple knockdowns\",\n      \"pmids\": [\"21076410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Kendrin (pericentrin) associates with NEK2A at centrosomes and inhibits NEK2A kinase activity in vitro in a dose-dependent manner through the Nek2A-binding region of kendrin; ectopic expression of this region reduces centrosome splitting at G2, indicating kendrin suppresses premature centrosome splitting by anchoring and inhibiting NEK2A.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase inhibition assay with purified kendrin fragments, overexpression with centrosome splitting quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase inhibition assay plus in-cell functional validation, single lab\",\n      \"pmids\": [\"20599736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Plk1 functions upstream of the Mst2-NEK2A module; Plk1 phosphorylates Mst2, which prevents PP1γ binding to the Mst2-NEK2A complex, thereby allowing NEK2A kinase activity to promote centrosome disjunction. Without Plk1-mediated Mst2 phosphorylation, PP1γ assembles into Nek2A-PP1γ-Mst2 complexes and counteracts NEK2A activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, Plk1 inhibition, siRNA knockdown, centrosome separation assays\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, kinase assays, and functional epistasis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21723128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NEK2 localizes to the nucleus of cancer cells, co-localizes in splicing speckles with SRSF1 and SRSF2, interacts with multiple splicing factors, and directly phosphorylates SRSF1; NEK2 overexpression affects SRSF1 splicing activity independently of SRPK1; NEK2 knockdown triggers pro-apoptotic splice variant expression and sensitizes cells to apoptosis.\",\n      \"method\": \"Immunofluorescence colocalization, co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, minigene splicing reporter assays, RT-PCR for endogenous targets\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, in vitro phosphorylation, and splicing functional assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24369428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NEK2 phosphorylates beta-catenin at N-terminal regulatory sites (same positions targeted by GSK3β: S33/S37/T41) as well as additional sites; NEK2 binding to beta-catenin inhibits beta-TrCP E3 ligase binding, preventing beta-catenin ubiquitination and degradation, leading to its stabilization and accumulation at mitotic centrosomes; Plk1 regulates this NEK2-mediated stabilization of beta-catenin.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, ubiquitination assay, phospho-specific antibody, in vitro and cell-based assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of phosphorylation and ubiquitination inhibition with cell-based validation, single lab\",\n      \"pmids\": [\"24501426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NEK2 co-localizes with Kif24 and phosphorylates it; NEK2-mediated phosphorylation stimulates Kif24 microtubule-depolymerizing activity, thereby promoting cilia disassembly and preventing cilia outgrowth in proliferating cells, independent of Aurora A and HDAC6.\",\n      \"method\": \"Co-localization, in vitro kinase assay, siRNA knockdown, ciliation quantification, rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro phosphorylation, functional rescue, and epistasis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26290419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nek2 knockdown in Xenopus leads to a centriole defect at the left-right organizer; Nek2 overexpression causes premature ciliary resorption dependent on the tubulin deacetylase Hdac6; NEK2 interacts with Nup98 (a nucleoporin at the ciliary base) and this interaction regulates cilium resorption.\",\n      \"method\": \"Xenopus morpholino knockdown and overexpression, epistasis with Hippo pathway, genetic interaction with Hdac6, co-immunoprecipitation (Nek2-Nup98)\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in Xenopus plus co-IP for binding partner, single lab\",\n      \"pmids\": [\"26493400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cep68 is phosphorylated by NEK2 in vivo, which promotes Cep68 degradation at mitotic onset; the SCF complex (via beta-TrCP F-box component) also targets Cep68 for destruction at mitosis; the C-terminal 300–400 aa of Cep68 are required for interphase centrosome localization.\",\n      \"method\": \"In vivo phosphorylation assays, proteasome inhibitor treatment, SCF component co-immunoprecipitation, truncation/deletion analysis with immunofluorescence\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo phosphorylation and SCF co-IP with functional localization data, single lab\",\n      \"pmids\": [\"25704143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DVL (Dishevelled) is a direct NEK2 substrate; NEK2 phosphorylates DVL at multiple residues, creating interfaces for binding to CDK5RAP2 and C-NAP1 at the centrosomal linker; NEK2-mediated DVL phosphorylation is coupled to dissolution of the centrosomal linker and centrosome separation; DVL depletion prevents NEK2-controlled linker dissolution; elevated DVL sequesters centrosomal NEK2 and mimics dominant-negative NEK2 phenotypes.\",\n      \"method\": \"Phospho-specific antibodies, co-immunoprecipitation, siRNA knockdown, overexpression, immunofluorescence centrosome separation assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — novel phospho-antibodies, reciprocal co-IP, and bidirectional functional genetics, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27486244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEK2 interacts with hnRNPA1/2 and regulates alternative splicing of PKM pre-mRNA by binding to the intronic sequence flanking exon 9; NEK2 promotes inclusion of exon 10 over exon 9, increasing the PKM2/PKM1 ratio and promoting aerobic glycolysis in multiple myeloma cells.\",\n      \"method\": \"Tandem affinity purification-mass spectrometry (TAP-MS), co-immunoprecipitation, RNA immunoprecipitation (RIP), Western blot, RT-PCR\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TAP-MS plus RIP and functional knockdown, single lab\",\n      \"pmids\": [\"28086949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEK2 forms a protein complex with EZH2 in glioma stem cells; NEK2 kinase activity phosphorylates EZH2 and protects it from ubiquitination-dependent proteasomal degradation, stabilizing EZH2 protein levels.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, kinase-dead mutant rescue, siRNA knockdown, in vivo tumor models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitination assay with kinase-dead control, single lab\",\n      \"pmids\": [\"28737508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NEK2 is bound to the deubiquitinase USP7; USP7 binding prevents NEK2 ubiquitination, stabilizing NEK2 protein; increased NEK2 activates the canonical NF-κB signaling pathway through the PP1α/AKT axis; NEK2 also activates heparanase in an NF-κB-dependent manner.\",\n      \"method\": \"Tandem affinity purification-mass spectrometry (TAP-MS), co-immunoprecipitation, ubiquitination assay, kinase/pathway activity assays, xenograft models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TAP-MS identification plus co-IP and functional pathway assays, single lab\",\n      \"pmids\": [\"29863498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NEK2 kinase activity at the G2/M transition is required for displacement of distal appendages (DAs) from mother centrioles before mitosis; overexpression of active (but not kinase-dead) NEK2A prematurely displaces DAs; NEK2 knockout causes incomplete DA dissociation and retention of cilia remnants in mitosis, leading to asymmetric inheritance of ciliary signaling components.\",\n      \"method\": \"NEK2 knockout, overexpression of active and kinase-dead NEK2A, immunofluorescence, live imaging, quantification of DA markers at mitotic centrosomes\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO plus kinase-dead vs. active overexpression, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"32211891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NEK2 interacts with USP7 and Beclin-1; NEK2 interaction with USP7 decreases Beclin-1 ubiquitination, stabilizing Beclin-1 protein without affecting its phosphorylation; this NEK2/USP7/Beclin-1 complex activates autophagy in multiple myeloma cells, contributing to bortezomib resistance.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown of Beclin-1 and NEK2, in vitro and in vivo drug resistance assays\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, ubiquitination assay, and functional knockdown, single lab\",\n      \"pmids\": [\"31955515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A unique binding mode allows NEK2A to be ubiquitinated by the APC/C-MCC complex in prometaphase: NEK2A binds the APC/C in a conformation-specific manner that allows it to access both UbcH10 and UbcH5 E2 enzymes, enabling efficient ubiquitination even while the spindle checkpoint is active.\",\n      \"method\": \"Biochemical reconstitution with purified APC/C and MCC, cryo-EM/structural analysis, in vitro ubiquitination assay, cell-based assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with structural analysis and functional validation, single lab\",\n      \"pmids\": [\"32307883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NEK2 phosphorylates PD-L1 at T194 and T210 residues within the glycosylation-rich region of PD-L1 via a NEK binding motif (F/LXXS/T); this phosphorylation prevents ubiquitin-proteasome pathway-mediated degradation of PD-L1 in the ER lumen, stabilizing PD-L1 and promoting immune evasion in pancreatic cancer.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay with phospho-site mapping, ubiquitination assay, siRNA knockdown, in vivo tumor-immune models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — phospho-site mutagenesis, ubiquitination assay, and in vivo functional validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34315872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEK2 directly phosphorylates NIK (NF-κB-inducing kinase), increasing NIK activity and stability, thereby activating the non-canonical NF-κB signaling pathway; this promotes glioblastoma progression.\",\n      \"method\": \"High-throughput RNA sequencing, co-immunoprecipitation, in vitro phosphorylation assay, siRNA knockdown, xenograft tumor models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and in vitro phosphorylation with functional in vivo validation, single lab\",\n      \"pmids\": [\"35031599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEK2 interacts with YAP1 and phosphorylates it at Thr-143, preventing YAP1 ubiquitination and proteasomal degradation; this stabilization of YAP1 by NEK2 promotes ESCC cell migration and invasion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (T143 phosphorylation site), cycloheximide chase, in vivo xenograft\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, mutagenesis, and ubiquitination assay with functional validation, single lab\",\n      \"pmids\": [\"35705994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p90Rsk2, activated by the MAPK/Erk1 pathway, directly phosphorylates the NEK2 kinase domain in vitro and stimulates NEK2 kinase activity in spermatocyte extracts; inhibition of the MAPK pathway (MEK inhibitor U0126) suppresses NEK2 activation during meiotic G2/M progression, placing NEK2 downstream of Erk1/p90Rsk2 in chromosome condensation.\",\n      \"method\": \"In vitro kinase assay, spermatocyte cell extracts, MEK inhibitor treatment, okadaic acid-induced G2/M progression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphorylation plus chemical genetic epistasis, single lab\",\n      \"pmids\": [\"11923207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In Drosophila, APC/C(Fzr/Cdh1) negatively regulates Nek2 kinase as a direct substrate; Nek2 phosphorylates Dishevelled (Dsh); this APC/C→Nek2→Dsh pathway controls Dsh levels and localization required for planar cell polarity (PCP) establishment.\",\n      \"method\": \"Drosophila genetics, epistasis analysis, in vitro kinase assay (Nek2 phosphorylating Dsh), loss-of-function and gain-of-function in PCP assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis plus in vitro kinase assay in Drosophila model, single lab\",\n      \"pmids\": [\"28041906\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NEK2 is a centrosomal serine/threonine kinase that peaks in late G2, phosphorylates centrosomal linker proteins (C-Nap1, rootletin, beta-catenin, Nlp, DVL, Cep68) to trigger centrosome disjunction and bipolar spindle formation, is regulated upstream by Plk1/Mst2/hSav1 and counteracted by PP1alpha/PP1gamma, undergoes checkpoint-independent APC/C-Cdc20-mediated proteasomal destruction in prometaphase via a direct MR-dipeptide interaction with the APC/C, and additionally functions as a nuclear splicing factor kinase (phosphorylating SRSF1), a regulator of cilia disassembly (via Kif24 phosphorylation and distal appendage displacement), and a stabilizer of oncogenic proteins (EZH2, YAP1, PD-L1, Beclin-1) through phosphorylation-dependent inhibition of their ubiquitination.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NEK2 is a cell cycle-regulated serine/threonine kinase that accumulates through S phase, peaks in late G2, and drives centrosome disjunction at the onset of mitosis [#0, #1, #5]. Its kinase activity is essential for splitting the interphase centrosome and forming a bipolar spindle, as kinase-dead NEK2A produces monopolar spindles with unseparated poles [#5]. NEK2 executes disjunction by phosphorylating components of the intercentriolar linker and associated factors\\u2014beta-catenin, Nlp, DVL, and Cep68\\u2014thereby dissolving the linker and displacing it from centrosomes [#12, #17, #29, #30]. Upstream control integrates the Hippo and Plk1 pathways: Mst2 and the scaffold hSav1 bind NEK2A and license its activity, while Plk1 phosphorylates Mst2 to exclude inhibitory PP1\\u03b3 from the complex; PP1\\u03b1 conversely suppresses NEK2 in an ATM-dependent manner following DNA damage [#16, #22, #24]. Beyond pole separation, NEK2A localizes to kinetochores and phosphorylates Hec1/Ndc80 at Ser165 to strengthen kinetochore\\u2013microtubule attachment and ensure faithful chromosome segregation [#4, #19]. NEK2A is held in check by checkpoint-independent destruction in prometaphase: it binds the APC/C directly through an exposed C-terminal MR dipeptide and is ubiquitinated even while the spindle checkpoint is active, using a binding mode that accesses both UbcH10 and UbcH5 E2 enzymes [#2, #13, #36]. Alternative splicing generates NEK2A, NEK2B, and a predominantly nuclear NEK2C variant differing in destruction motifs and nuclear localization signals [#3, #18]. In the nucleus, NEK2 acts as a splicing-factor kinase, colocalizing with and phosphorylating SRSF1 to modulate splicing and apoptotic sensitivity [#25]. NEK2 also governs cilia disassembly by phosphorylating Kif24 to stimulate its microtubule-depolymerizing activity and by driving distal-appendage displacement from mother centrioles at G2/M [#27, #34]. In cancer, NEK2 stabilizes oncogenic proteins by phosphorylation-dependent inhibition of their ubiquitination, including beta-catenin, EZH2, YAP1, PD-L1, and Beclin-1 [#26, #32, #37, #39, #35].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing when NEK2 acts in the cell cycle was prerequisite to assigning a function; periodic accumulation peaking in late G2 placed it at mitotic onset.\",\n      \"evidence\": \"Cell synchronization and immunoblotting across the cell cycle\",\n      \"pmids\": [\"7522034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify substrates\", \"Does not establish a mechanism of cell cycle regulation\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defining NEK2 as a bona fide serine/threonine kinase capable of autophosphorylation established the biochemical basis for all downstream substrate work.\",\n      \"evidence\": \"In vitro kinase assay with recombinant protein and peptide substrates\",\n      \"pmids\": [\"7759549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrate identified\", \"Beta-casein is a generic in vitro substrate\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Distinguishing the centrosome-splitting NEK2A from NEK2B and showing kinase activity is required for disjunction defined the core cellular function.\",\n      \"evidence\": \"Splice-variant analysis, overexpression, and wild-type vs. kinase-dead live imaging\",\n      \"pmids\": [\"11742531\", \"12857871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the linker substrates dissolved during splitting\", \"Does not explain how kinase activity is spatially restricted\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that NEK2A is destroyed at mitotic entry via APC/C-Cdc20 through a D-box and KEN-box explained why active kinase is restricted to G2/prophase.\",\n      \"evidence\": \"Cell-free degradation assays and destruction-motif mutagenesis\",\n      \"pmids\": [\"11742988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how degradation occurs independent of the spindle checkpoint\", \"Mechanism of direct APC/C engagement unresolved at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing NEK2A binds APC/C directly via a C-terminal MR dipeptide independent of Cdc20 explained its checkpoint-independent prometaphase destruction.\",\n      \"evidence\": \"In vitro binding to purified APC/C, peptide competition, and mutagenesis\",\n      \"pmids\": [\"16648845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve E2 enzyme requirements during active checkpoint\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining a conformation-specific APC/C binding mode that recruits both UbcH10 and UbcH5 E2 enzymes explained how NEK2A is ubiquitinated even while the checkpoint is on.\",\n      \"evidence\": \"Reconstitution with purified APC/C-MCC, structural analysis, and in vitro ubiquitination\",\n      \"pmids\": [\"32307883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address in vivo dynamics of destruction relative to centrosome separation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating NEK2 phosphorylates Hec1 at Ser165 and that this is essential for viability linked NEK2 directly to chromosome segregation, later mechanistically tied to Ndc80\\u2013microtubule affinity.\",\n      \"evidence\": \"In vitro kinase assay, site mutagenesis, yeast complementation, and in vitro Ndc80\\u2013microtubule binding reconstitution\",\n      \"pmids\": [\"12386167\", \"18297113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish how kinetochore-localized NEK2A is regulated relative to the centrosomal pool\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapping how NEK2 reaches the centrosome\\u2014microtubule trafficking, PCM-1-dependent recruitment, and rapid local turnover\\u2014explained its spatial control at the centrosome.\",\n      \"evidence\": \"Live imaging, FRAP, PCM-1 depletion, and microtubule-binding mutagenesis\",\n      \"pmids\": [\"15659651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define how local proteasomal turnover is targeted\", \"Recruitment signal that triggers activation unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying beta-catenin as a direct linker-associated substrate, and later that NEK2 phosphorylation blocks beta-TrCP-mediated degradation, unified centrosome disjunction with a substrate-stabilization mechanism.\",\n      \"evidence\": \"In vitro kinase assays, co-IP, ubiquitination assays, and centrosomal epistasis\",\n      \"pmids\": [\"18086858\", \"24501426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between centrosomal beta-catenin and canonical Wnt signaling not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Crystal structures revealed an autoinhibitory activation-loop helix and dimerization-dependent allosteric regulation, defining how NEK2 catalytic activity is switched on.\",\n      \"evidence\": \"X-ray crystallography (2.2 \\u00c5 and 1.55 \\u00c5), mass spectrometry of autophosphorylation sites, and mutagenesis\",\n      \"pmids\": [\"17197699\", \"19124027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures do not capture the active full-length dimer\", \"In vivo activating phosphorylations incompletely mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placing NEK2A downstream of Mst2/hSav1 and, in turn, Plk1\\u2014with PP1\\u03b3 as the counteracting phosphatase\\u2014built the upstream regulatory circuit governing disjunction timing.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, siRNA epistasis, and Plk1 inhibition\",\n      \"pmids\": [\"21076410\", \"21723128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the Eg5 and Mst2-NEK2A pathways are coordinated remains unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying DVL as a NEK2 substrate that scaffolds linker proteins and whose phosphorylation drives linker dissolution mechanistically connected NEK2 to centrosome separation, with conservation in Drosophila PCP.\",\n      \"evidence\": \"Phospho-specific antibodies, co-IP, bidirectional genetics, and Drosophila epistasis with in vitro kinase assay\",\n      \"pmids\": [\"27486244\", \"28041906\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cross-talk between centrosomal DVL phosphorylation and Wnt/PCP signaling pools not delineated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showing nuclear NEK2 colocalizes with and phosphorylates SRSF1 to modulate splicing extended NEK2 function beyond the centrosome to RNA processing and apoptotic control.\",\n      \"evidence\": \"Colocalization, co-IP, in vitro kinase assay, and minigene splicing reporters\",\n      \"pmids\": [\"24369428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide splicing targets not defined\", \"Relationship to SRPK1 regulation incomplete\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating NEK2 phosphorylates Kif24 and drives distal-appendage displacement defined its role in cilia disassembly and asymmetric ciliary inheritance.\",\n      \"evidence\": \"In vitro kinase assay, ciliation rescue, NEK2 knockout, and distal-appendage marker quantification\",\n      \"pmids\": [\"26290419\", \"32211891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NEK2 ciliary and centrosomal functions are temporally partitioned is unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A recurring oncogenic theme emerged in which NEK2 phosphorylates client proteins (EZH2, YAP1, PD-L1, Beclin-1) to block their ubiquitination and stabilize them, linking NEK2 to immune evasion, drug resistance, and tumor progression.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, phospho-site mutagenesis, and in vivo tumor models across cancer types\",\n      \"pmids\": [\"28737508\", \"35705994\", \"34315872\", \"31955515\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most client-stabilization findings rest on single labs\", \"Whether a common phospho-degron-masking mechanism applies across substrates is not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NEK2's many functions\\u2014centrosome disjunction, kinetochore attachment, splicing, cilia disassembly, and oncoprotein stabilization\\u2014are coordinated by a single kinase across compartments and cell cycle phases remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model linking nuclear, centrosomal, and ciliary substrate selection\", \"Spatiotemporal logic of substrate choice undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 4, 12, 17, 25, 27, 37]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 4, 17, 26, 37]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [25, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 5, 11, 17, 22]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 25]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [25]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [27, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 2, 5, 13, 22, 36]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [25, 31]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [27, 34]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 13, 26, 32, 37]}\n    ],\n    \"complexes\": [\"APC/C (substrate-bound)\", \"Mst2-hSav1-NEK2A\", \"NEK2A-PP1\\u03b3-Mst2\"],\n    \"partners\": [\"MST2\", \"SAV1\", \"PLK1\", \"PPP1CA\", \"DVL\", \"CTNNB1\", \"USP7\", \"SRSF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":10,"faith_total":10,"faith_pct":100.0}}