{"gene":"TPX2","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2003,"finding":"Crystal structures of phosphorylated Aurora-A with and without a 43-residue TPX2 domain revealed the molecular mechanism of Aurora-A activation: TPX2 binding pulls on the Aurora-A activation segment, swinging the phosphothreonine (pThr) into a buried position and locking the active conformation, while also protecting pThr from phosphatase-mediated dephosphorylation. No global conformational changes in the kinase are induced.","method":"X-ray crystallography (crystal structures of Aurora-A ± TPX2 fragment), biochemical kinase activity assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with functional validation, foundational mechanism paper replicated by multiple subsequent structural studies","pmids":["14580337"],"is_preprint":false},{"year":2002,"finding":"Human TPX2 directly binds the C-terminal catalytic domain of Aurora-A via its N-terminus (reciprocal co-IP from mitotic HeLa extracts and direct binding studies). TPX2 is required for targeting Aurora-A to spindle microtubules (not spindle poles); depletion of TPX2 by siRNA abolishes Aurora-A association with microtubules. Conversely, Aurora-A depletion has no effect on TPX2 localization. Aurora-A phosphorylates TPX2.","method":"Reciprocal co-immunoprecipitation, mass spectrometry identification, siRNA knockdown, immunofluorescence localization, in vitro binding and kinase assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with MS identification plus siRNA phenotype, replicated across multiple subsequent studies","pmids":["12177045"],"is_preprint":false},{"year":2000,"finding":"Xenopus TPX2 is a microtubule-associated protein required for spindle pole organization. It is nuclear during interphase and localizes to spindle poles in mitosis in a dynein-dynactin-dependent manner. Immunodepletion from mitotic egg extracts causes bipolar structures with disintegrating poles and decreased microtubule density; excess TPX2 causes monopolar structures with enlarged poles. TPX2 also targets Xklp2 to microtubule minus ends.","method":"Xenopus egg extract immunodepletion/add-back, immunofluorescence, biochemical fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunodepletion with rescue, multiple orthogonal functional readouts, foundational study replicated widely","pmids":["10871281"],"is_preprint":false},{"year":2003,"finding":"In Xenopus, Aurora A autophosphorylation requires only Thr-295 for activity. TPX2 binding activates Aurora A and leads to phosphorylation of three Ser residues in the N-terminus of TPX2; mutation of these sites does not affect Aurora A activation. Mutation of a putative Aurora A-binding motif in TPX2 abolishes both TPX2 phosphorylation and Aurora A activation. p53 blocks Aurora A activity, and TPX2 inhibits this p53-mediated inhibition.","method":"In vitro kinase assays, site-directed mutagenesis, biochemical binding assays with Xenopus proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab but multiple orthogonal experiments","pmids":["14701852"],"is_preprint":false},{"year":2004,"finding":"Domain analysis of Xenopus TPX2 shows: the large N-terminal domain (containing the Aurora A binding peptide) directly binds microtubules and nucleates MTs in pure tubulin but cannot rescue spindle assembly in TPX2-depleted extract. The large C-terminal domain (lacking Aurora A binding) does not bind pure MTs directly but rescues RanGTP-dependent microtubule nucleation and spindle assembly in depleted extract, indicating the C-terminus functions in a network with other RanGTP-regulated factors.","method":"Xenopus egg extract immunodepletion, domain truncation/add-back experiments, in vitro MT polymerization assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution combined with domain dissection in extract, multiple constructs tested","pmids":["15385625"],"is_preprint":false},{"year":2006,"finding":"Aurora-A and Plk1 are part of a hierarchical signaling cascade in spindle formation: Plk1 controls the localization of Aurora-A to centrosomes and TPX2 recruitment to microtubules. Aurora-A and TPX2 are required for centriole cohesion and spindle bipolarity; TPX2 also contributes to centrosome maturation independently of its microtubule organization role.","method":"RNA interference knockdown of Aurora-A, Plk1, and TPX2 individually and in combination, immunofluorescence, epistasis analysis in mammalian cells","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis by RNAi with defined cellular phenotypes, single lab","pmids":["16418575"],"is_preprint":false},{"year":2008,"finding":"The C-terminal domain of Xenopus TPX2 contains a discrete Eg5-interacting domain. Injection of TPX2-C-terminus into embryos causes spindle collapse and failure of pole segregation; these phenotypes require the Eg5-binding region and are rescued by Eg5 injection. This defines a novel Eg5-dependent role of TPX2 C-terminus in spindle pole segregation.","method":"Xenopus embryo microinjection, Xenopus S3 cell transfection, in vitro binding assays, live imaging","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo rescue experiments with deletion constructs and Eg5 injection, single lab","pmids":["18372177"],"is_preprint":false},{"year":2008,"finding":"In mouse oocytes, TPX2 protein accumulates from meiosis I to II and controls spindle assembly via two distinct functions: (1) microtubule assembly regulation and (2) spindle pole integrity via Aurora A-dependent phosphorylation of TACC3, a regulator of MTOC activity. RNAi depletion of TPX2 and live imaging demonstrated these requirements.","method":"RNAi depletion, live cell imaging, immunofluorescence, mouse oocyte meiotic system","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with live imaging and defined phenotypic readouts, single lab","pmids":["18833336"],"is_preprint":false},{"year":2010,"finding":"TPX2 protects Aurora-A from proteasomal degradation in both interphase and mitosis in human cells. Aurora-A levels decrease in TPX2-silenced G2 and prometaphase cells in a proteasome- and Cdh1/APC-C-dependent manner. Reintroduction of full-length TPX2 or its Aurora-A-binding region restores Aurora-A levels; a truncated TPX2 lacking this domain cannot. This stability function is independent of TPX2's ability to activate Aurora-A or localize it to the spindle.","method":"siRNA silencing, proteasome inhibitor treatment, rescue with truncation constructs, co-immunoprecipitation, immunofluorescence, western blotting in human cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — siRNA with domain-specific rescue, multiple orthogonal methods in one study, mechanistically distinct from prior findings","pmids":["21147853"],"is_preprint":false},{"year":2011,"finding":"TPX2 acts as a scaffold and co-activator of the Chromosomal Passenger Complex (CPC): immunodepletion of TPX2 from Xenopus egg extracts decreases Aurora B-Survivin and Aurora B-INCENP interactions, reducing Aurora B activity. TPX2 residues 138–328 are sufficient to enhance Aurora B-Survivin association and Aurora B kinase activity in vitro. Overexpression of this region in HeLa cells causes metaphase chromosome alignment defects and INCENP mislocalization.","method":"Xenopus egg extract immunodepletion, in vitro Aurora B kinase assays, HeLa cell transfection, immunofluorescence","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunodepletion and in vitro reconstitution with defined domain, single lab","pmids":["22560880"],"is_preprint":false},{"year":2012,"finding":"TPX2 is required for spindle function and chromosome segregation in the mouse embryo. Conditional Tpx2 knockout in primary mouse cultures causes deficient microtubule nucleation from DNA and aberrant spindles during prometaphase, with cells exiting mitosis without chromosome segregation. Tpx2 haploinsufficiency leads to aneuploidy accumulation in vivo and increased susceptibility to spontaneous lymphomas and lung tumors.","method":"Conditional null mouse genetics, primary cell culture, immunofluorescence, flow cytometry, in vivo tumor analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse knockout with multiple orthogonal phenotypic readouts, genetically rigorous","pmids":["22266221"],"is_preprint":false},{"year":2012,"finding":"Nuclear TPX2 plays a role in the DNA double-strand break response: loss of TPX2 leads to aberrantly high and transient accumulation of γ-H2AX (Ser139-phosphorylated H2AX) at G0/G1 after ionizing radiation, with more numerous high-intensity γ-H2AX foci. Overexpression reduces γ-H2AX after IR. TPX2 accumulates at DSBs and associates (by co-IP) with MDC1 and ATM. Pharmacological inhibition or depletion of ATM or MDC1 (but not DNA-PK) antagonizes the γ-H2AX phenotype caused by TPX2 depletion.","method":"siRNA depletion, ionizing radiation, γ-H2AX immunofluorescence and flow cytometry, co-immunoprecipitation, pharmacological inhibitors, cell fractionation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus siRNA with pharmacological epistasis, single lab, multiple orthogonal methods","pmids":["23045526"],"is_preprint":false},{"year":2014,"finding":"Elucidate molecular mechanism of Aurora A autophosphorylation as intermolecular in a long-lived dimer (resolved by X-ray crystallography and functional assays). TPX2 allosterically activates dephosphorylated Aurora A by binding a conserved hydrophobic groove, shifting the equilibrium toward the active conformation—distinct from phosphorylation-mediated activation. Crystal structure of dephosphorylated Aurora A-TPX2(1-25) domain-swapped dimer reported.","method":"X-ray crystallography, NMR, functional kinase assays, site-directed mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus functional assays plus mutagenesis in one rigorous study, resolves prior mechanistic controversy","pmids":["24867643"],"is_preprint":false},{"year":2014,"finding":"Nuclear TPX2 constitutively controls the levels of histone H4 acetylated at Lys16 (H4K16ac) during G1 phase: TPX2 depletion decreases H4K16ac, and this decrease correlates with increased γ-H2AX after IR. TPX2 interacts (by co-IP) with SIRT1, which is identified as a novel TPX2 complex partner. TPX2 depletion also impairs 53BP1 ionizing radiation-induced foci formation.","method":"siRNA depletion, immunofluorescence, flow cytometry, co-immunoprecipitation, western blot for H4K16ac","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP and siRNA phenotype, single lab, mechanistically novel but limited to single study","pmids":["25365214"],"is_preprint":false},{"year":2014,"finding":"TPX2 levels modulate meiotic spindle size and architecture in Xenopus through Eg5: elevated TPX2 in X. tropicalis extracts reduces spindle length and recruits Eg5 to poles, increasing MT density there. Higher TPX2 partitions MTs between an antiparallel array (spindle expansion) and a parallel cross-linked architecture at spindle poles via Eg5.","method":"Xenopus egg extract manipulation, TPX2 immunodepletion and add-back, Eg5 inhibition, immunofluorescence quantification","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — extract manipulation with multiple orthogonal tests, single lab","pmids":["25070954"],"is_preprint":false},{"year":2015,"finding":"Human TPX2 directly stabilizes growing microtubule ends and stimulates microtubule nucleation by stabilizing early nucleation intermediates (using in vitro reconstitution with purified proteins). chTOG alone only weakly promotes nucleation but acts synergistically with TPX2. Importins block TPX2 interaction with nucleation intermediates selectively, controlling nucleation efficiency.","method":"In vitro dynamic reconstitution assays with purified human proteins, TIRF microscopy, importin competition assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins and TIRF microscopy, defined mechanism with importin epistasis","pmids":["26414402"],"is_preprint":false},{"year":2015,"finding":"TPX2 inhibits the mitotic kinesin Eg5 through two mechanisms: (1) direct binding to microtubules (apparent Kd ~200 nM, independent of tubulin C-terminal tails) and (2) interaction with the Eg5 motor/neck region requiring Eg5 dimerization. Full-length TPX2 dramatically reduces Eg5 velocity in single-molecule TIRF assays; a C-terminal truncation lacking the Eg5-binding domain is a less effective inhibitor.","method":"TIRF single-molecule assays, microtubule gliding assays, co-sedimentation, fluorescence microscopy with mammalian cell extracts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro single-molecule reconstitution with purified proteins and defined truncation constructs","pmids":["26018074"],"is_preprint":false},{"year":2015,"finding":"TPX2 regulates neuronal morphology through its kinesin-5 (Eg5) interacting domain: TPX2 depletion from cultured neurons speeds axon outgrowth similarly to kinesin-5 inhibition; re-expression of TPX2 rescues the phenotype, but not if the kinesin-5-interacting domain is deleted.","method":"siRNA depletion, domain-deletion rescue in primary cultured neurons, morphological quantification","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA with domain-specific rescue, single lab, two orthogonal approaches","pmids":["26257190"],"is_preprint":false},{"year":2016,"finding":"TPX2 suppresses tubulin subunit off-rates from microtubule ends during both assembly and disassembly, enabling unprecedentedly slow plus-end growth rates and dramatically reduced shortening rates. Computational simulations explain these dynamics by a moderate increase in tubulin-tubulin bond strength upon TPX2 lattice association.","method":"In vitro TIRF microscopy-based dynamic MT assembly assays, computational simulations","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro reconstitution with computational modeling, single lab","pmids":["26869224"],"is_preprint":false},{"year":2016,"finding":"AurkinA, a small-molecule inhibitor of the Aurora A-TPX2 PPI, binds to a hydrophobic 'Y-pocket' on Aurora A that normally accommodates a conserved Tyr-Ser-Tyr motif from TPX2, inducing structural changes that inhibit catalytic activity without affecting ATP binding. This defines an allosteric inhibition mechanism and confirms the Y-pocket as a key regulatory site. Cells exposed to AurkinA mislocalize Aurora A from spindle microtubules.","method":"X-ray crystallography, in vitro kinase assays, cell-based immunofluorescence","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional assays and cellular validation, defines novel allosteric mechanism","pmids":["27339427"],"is_preprint":false},{"year":2016,"finding":"The C-terminal domain of TPX2 contributes to localization and motility of both Eg5 and Kif15 (kinesin-12) to spindle microtubules in cells, and suppresses Kif15 motor walking in vitro. Kif15-dependent bipolar spindle formation in the absence of Eg5 activity requires the C-terminal domain of TPX2. Kif15 puncta move toward the spindle equator at a rate equivalent to microtubule growth; paclitaxel treatment suppresses this movement.","method":"TPX2 domain deletion/rescue in cells, in vitro single-molecule kinesin assays, live cell imaging, paclitaxel treatment","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo domain-deletion experiments with defined kinesin phenotypes, single lab","pmids":["27852894"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of a central region of TPX2 bound to the microtubule surface shows TPX2 uses two flexibly linked elements ('ridge' and 'wedge') to simultaneously bind across longitudinal and lateral tubulin interfaces. These MT-interacting elements overlap with the importin-binding site on TPX2. Fluorescence microscopy-based in vitro reconstitution assays confirm this interaction mode is critical for MT binding and nucleation.","method":"Cryo-electron microscopy, in vitro MT reconstitution/TIRF microscopy, importin competition assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with functional reconstitution validation, defines the MT-binding mechanism","pmids":["29120325"],"is_preprint":false},{"year":2017,"finding":"Structural analysis of Xenopus TPX2 defines its minimal domain for branching MT nucleation, which requires newly identified γ-TuRC nucleation activator motifs (distinct from general MT-binding/bundling ability). Separation-of-function mutations leave TPX2 binding to γ-TuRC intact but abolish branching MT nucleation, indicating TPX2 activates γ-TuRC to promote branching nucleation.","method":"Domain truncation/mutation analysis, γ-TuRC binding assays, Xenopus egg extract branching MT nucleation assays, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — separation-of-function mutagenesis with in vitro reconstitution and binding assays, single rigorous study","pmids":["28264915"],"is_preprint":false},{"year":2019,"finding":"CDK5 phosphorylates TPX2 at serine 486, promoting TPX2 protein stability (phosphorylation-dependent stabilization). This CDK5-mediated phosphorylation and stabilization of TPX2 promotes hepatocellular proliferation and tumorigenicity; TPX2 silencing restores normal migration in CDK5-overexpressing HCC cells.","method":"Comparative phosphoproteomics screening, in vitro and in vivo CDK5 kinase assays, site-directed mutagenesis (S486), western blot, xenograft models","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus in vitro kinase assay with mutagenesis, single lab","pmids":["31272499"],"is_preprint":false},{"year":2019,"finding":"TPX2/Aurora A heterodimer (nominally a mitotic complex) acts as a novel binding partner of 53BP1 in a DNA damage context. Loss of TPX2 or Aurora A compromises DNA end resection, BRCA1 and Rad51 recruitment, and homologous recombination. Loss of TPX2 or Aurora A also causes deprotection of stalled replication forks by failing to counteract MRE11 nuclease activity. Concurrent 53BP1 loss rescues BRCA1/Rad51 recruitment and fork instability upon TPX2 loss.","method":"Co-immunoprecipitation, siRNA knockdown, DNA fiber assays, HR reporter assays, epistasis by double knockdown","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus siRNA epistasis with multiple orthogonal DNA repair assays, single lab","pmids":["30602538"],"is_preprint":false},{"year":2020,"finding":"TPX2 phase separates into a co-condensate with tubulin, which mediates microtubule nucleation in vitro and in isolated cytosol. Co-condensation preferentially occurs on pre-existing microtubules (site of branching nucleation) at endogenous TPX2 concentrations. Importin-α/β heterodimer inhibits TPX2 condensation in vitro, thereby inhibiting branching MT nucleation activity in cytosol.","method":"In vitro phase separation assays, droplet formation microscopy, cytosol-based MT nucleation assays, importin competition, TPX2 truncation/chimera analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of phase separation combined with functional nucleation assays and importin regulation, multiple orthogonal approaches in one study","pmids":["31937751"],"is_preprint":false},{"year":2020,"finding":"Excess TPX2 causes aberrantly stable microtubules at mitotic exit that interfere with nuclear reconstitution and lamin B1 network assembly, resulting in doughnut-shaped daughter nuclei. This phenotype is independent of TPX2's interaction with Aurora-A (shown using a truncated TPX2 unable to bind Aurora-A).","method":"TPX2 overexpression (full-length and Aurora-A-binding truncation) in non-transformed hTERT RPE-1 cells, immunofluorescence, live imaging","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific overexpression with defined phenotypic readouts, single lab","pmids":["32041138"],"is_preprint":false},{"year":2021,"finding":"TPX2 interacts with importin-α/β in a 1:1:1 monodispersed trimer with nanomolar affinity. A new nuclear localization sequence in TPX2 contributes to high-affinity importin-α binding; TPX2 also interacts with importin-β via dispersed weak interactions. Both importin-α and importin-β interactions inhibit TPX2 phase separation, which enhances branching MT nucleation.","method":"Biochemical binding assays (ITC, pull-down), NLS mapping, phase separation assays with importin competition, size exclusion chromatography","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative binding assays (ITC) plus phase separation reconstitution, multiple orthogonal methods, single lab","pmids":["34302807"],"is_preprint":false},{"year":2021,"finding":"WDR62 functions as an adaptor protein between TPX2/Aurora A and katanin at the spindle pole: TPX2/Aurora A recruits WDR62 to the spindle pole; WDR62 complexed with TPX2/Aurora A (but not WDR62 alone) potently promotes katanin-mediated severing of GDP-MTs in vitro. A TPX2-Aurora A-WDR62-katanin signaling axis in cells regulates spindle dynamics.","method":"Co-IP, in vitro MT severing reconstitution, domain binding assays, spindle pole fractionation, live cell imaging","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reconstitution plus cellular co-IP, single lab","pmids":["34137789"],"is_preprint":false},{"year":2021,"finding":"TPX2 regulates astral microtubule assembly and spindle orientation: GM130 on Golgi membranes activates TPX2 locally by competing with importin-α1 (KPNA2) for TPX2 binding. CDK1 phosphorylates importin-α at serine 62 during mitosis, switching its substrate preference from TPX2 to GM130 and thereby enabling competition-based TPX2 activation. Importin-α S62A mutation impedes local TPX2 activation, compromises astral MT formation, and results in misoriented spindles.","method":"Co-immunoprecipitation, phospho-specific mutants of importin-α, RNAi, immunofluorescence, spindle orientation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with phospho-mutant rescue experiments, single lab, two orthogonal methods","pmids":["33526712"],"is_preprint":false},{"year":2023,"finding":"Aurora A nuclear localization is promoted by co-overexpression with TPX2 and counteracted by proteasomal degradation. TPX2 co-overexpression (but not Aurora A overexpression alone) is required for Aurora A nuclear accumulation in interphase. In MCF10A mammospheres, TPX2 co-overexpression drives protumorigenic processes downstream of nuclear Aurora A. AURKA, TPX2, and the import regulator CSE1L are co-overexpressed in tumors.","method":"Co-overexpression experiments, proteasome inhibitor treatment, immunofluorescence quantification of nuclear localization, mammosphere assays","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-overexpression with proteasome inhibition and domain-specific constructs, single lab","pmids":["36797043"],"is_preprint":false},{"year":2023,"finding":"PP6 (phosphatase, PPP6C catalytic subunit) regulates Aurora A-TPX2 complex activity at kinetochores: loss of PP6 amplifies Aurora A activity and enlarges spindles with defective chromosome separation. Aurora A-TPX2 phosphorylates NDC80 on multiple N-terminal sites exclusively at checkpoint-silenced, MT-attached kinetochores; NDC80 phospho-deficient 9A mutant reduces spindle size and suppresses nuclear structure defects in PPP6C KO cells. NDC80 phosphorylation is Aurora B-independent.","method":"Phosphoproteomics, genetic knockout (PPP6C), phospho-specific antibodies, NDC80-9A mutant rescue, immunofluorescence","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO combined with phospho-mutant rescue and substrate identification, single lab","pmids":["36897279"],"is_preprint":false},{"year":2015,"finding":"Phosphorylation of TPX2 at Thr72 by CDK1/2 (in vitro and in vivo, cell cycle-dependent, peaking at M phase) regulates TPX2 spindle localization: endogenous TPX2-pThr72 does not associate with spindle; GFP-TPX2 T72A (non-phosphorylatable) preferentially concentrates on the spindle compared to wild-type. T72A overexpression increases multipolar spindles and is associated with elevated Aurora A and Eg5 activity.","method":"In vitro CDK1/2 kinase assays, phospho-specific antibody generation, cell cycle synchronization, GFP-TPX2 mutant transfection, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus phospho-mutant cell biology, single lab, multiple orthogonal methods","pmids":["25688093"],"is_preprint":false},{"year":2006,"finding":"TPX2 is required for postmitotic nuclear assembly: depletion of TPX2 from Xenopus nuclear assembly extracts produces nuclei ~1/5 the size of controls. TPX2 interacts (by pulldown) with LAP2 (lamina-associated polypeptide 2), and LAP2 localization is disrupted in TPX2-depleted nuclei, suggesting the TPX2-LAP2 interaction is required for proper nuclear reformation.","method":"Xenopus egg extract immunodepletion, nuclear assembly assay, size quantification, co-immunoprecipitation/pulldown for TPX2-LAP2 interaction","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunodepletion with mechanistic pulldown, single lab","pmids":["16735579"],"is_preprint":false},{"year":2007,"finding":"TPX2(1-43) binding to Aurora A increases catalytic efficiency by increasing binding affinity for both ATP and peptide substrate. TPX2 binding does not change the reaction mechanism (rapid equilibrium random mechanism) or turnover number. TPX2 binding decreases the size and accessibility of a hydrophobic pocket adjacent to the ATP site, altering inhibitor SAR.","method":"In vitro kinase assays with purified proteins, enzyme kinetics (Km/Vmax determination), computer modeling","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro kinetic analysis with computational modeling, single lab","pmids":["17705509"],"is_preprint":false},{"year":2025,"finding":"TPX2 is lactylated at K249 in HCC tumor tissues; this modification is written by CBP (lactylase) and erased by HDAC1. TPX2 lactylation is required for cell cycle progression and tumor growth. Mechanistically, TPX2 K249 lactylation disrupts PP1 binding to Aurora A, enhances Aurora A T288 phosphorylation, and facilitates cell cycle progression.","method":"Mass spectrometry identification of lactylation site, CBP/HDAC1 knockdown, PP1 co-immunoprecipitation, Aurora A pT288 western blot, xenograft tumor models","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific PTM identification with writer/eraser and mechanistic downstream validation, single lab","pmids":["40107714"],"is_preprint":false},{"year":2023,"finding":"TPX2 directly interacts with PXR (pregnane X receptor) by co-immunoprecipitation and enhances PXR transcriptional activation of downstream genes (cyp3a4, MDR-1), promoting sorafenib resistance in HCC cells. Overexpression of TPX2 increases PXR recruitment to the CYP3A4 PXRE/XREM promoter regions.","method":"Co-immunoprecipitation, luciferase reporter assay, ChIP assay, qPCR, drug metabolism assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus ChIP plus reporter assay, single lab, multiple orthogonal methods","pmids":["36707511"],"is_preprint":false}],"current_model":"TPX2 is a multifunctional microtubule-associated spindle assembly factor that: (1) binds the N-terminal domain of Aurora A kinase, allosterically activating it by burying the phosphothreonine in the active conformation and protecting it from dephosphorylation, while also stabilizing Aurora A protein against APC/C-Cdh1-mediated proteasomal degradation; (2) promotes microtubule nucleation by stabilizing nucleation intermediates, suppressing tubulin off-rates, co-condensing with tubulin via phase separation on pre-existing MTs, and activating the γ-TuRC via dedicated nucleation activator motifs; (3) regulates mitotic motor proteins Eg5 and Kif15 through its C-terminal domain; (4) is controlled spatially by importin-α/β, which sequesters TPX2 (inhibiting its phase separation and MT-nucleation activities) until released by RanGTP near chromosomes; (5) functions in the nucleus during interphase to amplify the DNA damage response via ATM/MDC1 and to maintain H4K16 acetylation; (6) undergoes regulatory post-translational modifications including CDK1/2-mediated phosphorylation at Thr72 (regulating spindle localization), CDK5-mediated phosphorylation at Ser486 (promoting protein stability), and lactylation at K249 (disrupting PP1 binding to Aurora A to enhance its activity)."},"narrative":{"mechanistic_narrative":"TPX2 is a Ran-regulated, microtubule-associated spindle assembly factor that couples Aurora A kinase activation to spatially controlled microtubule nucleation during mitosis [PMID:10871281, PMID:12177045, PMID:26414402]. Through its N-terminus it directly binds the Aurora A catalytic domain and allosterically activates the kinase by pulling on the activation segment to bury the phosphothreonine in the active conformation and shield it from phosphatase action, an activation that operates even on dephosphorylated Aurora A and increases catalytic efficiency by raising affinity for ATP and substrate [PMID:14580337, PMID:24867643, PMID:17705509]; the same interaction targets Aurora A to spindle microtubules and protects it from APC/C-Cdh1–dependent proteasomal degradation independently of kinase activation [PMID:12177045, PMID:21147853]. TPX2 promotes microtubule assembly by directly stabilizing nucleation intermediates and growing plus ends, suppressing tubulin off-rates, and co-condensing with tubulin via phase separation on pre-existing microtubules, and it activates γ-TuRC-dependent branching nucleation through dedicated nucleation-activator motifs that bind tubulin across longitudinal and lateral interfaces using flexibly linked 'ridge' and 'wedge' elements [PMID:26414402, PMID:26869224, PMID:31937751, PMID:28264915, PMID:29120325]. Its C-terminal domain regulates the mitotic kinesins Eg5 and Kif15, controlling spindle pole segregation, spindle size, and motor motility [PMID:18372177, PMID:26018074, PMID:27852894, PMID:25070954]. These activities are spatially gated by importin-α/β, which binds TPX2 with nanomolar affinity over a region overlapping its microtubule- and nucleation-interaction surfaces and inhibits its phase separation until released by RanGTP or by competing factors such as GM130 near membranes and chromatin [PMID:34302807, PMID:29120325, PMID:31937751, PMID:33526712]. TPX2 is essential for spindle bipolarity and faithful chromosome segregation in vivo, and its haploinsufficiency drives aneuploidy and tumorigenesis [PMID:22266221, PMID:10871281]. Beyond mitosis, nuclear TPX2 amplifies the DNA double-strand break response through ATM/MDC1 and an Aurora A–53BP1 axis governing end resection and fork protection, and maintains H4K16 acetylation via SIRT1 [PMID:23045526, PMID:30602538, PMID:25365214]. TPX2 activity is further tuned by CDK1/2 phosphorylation at Thr72 governing spindle localization, CDK5 phosphorylation at Ser486 promoting stability, and K249 lactylation that disrupts PP1 binding to Aurora A to enhance kinase activity [PMID:25688093, PMID:31272499, PMID:40107714].","teleology":[{"year":2000,"claim":"Established TPX2 as a microtubule-associated protein essential for spindle pole organization, answering whether a dedicated factor links chromatin-proximal microtubule density to bipolar spindle architecture.","evidence":"Xenopus egg extract immunodepletion/add-back with immunofluorescence and motor-targeting assays","pmids":["10871281"],"confidence":"High","gaps":["Molecular activity driving nucleation undefined","No mechanism linking TPX2 to a kinase partner yet","Ran/importin regulation not addressed"]},{"year":2002,"claim":"Identified Aurora A as a direct TPX2 partner and showed TPX2 targets Aurora A to spindle microtubules, defining the physical link between a spindle MAP and a mitotic kinase.","evidence":"Reciprocal Co-IP with MS, siRNA knockdown, immunofluorescence, and in vitro binding/kinase assays in human cells","pmids":["12177045"],"confidence":"High","gaps":["Structural basis of activation not resolved","Functional consequence of TPX2 phosphorylation unknown"]},{"year":2003,"claim":"Resolved the structural mechanism of Aurora A activation, showing TPX2 swings the phosphothreonine into a buried active position and shields it from dephosphorylation without global conformational change.","evidence":"X-ray crystallography of Aurora A ± TPX2 fragment with kinase activity assays; supported by in vitro mutagenesis defining the Aurora A–binding motif","pmids":["14580337","14701852"],"confidence":"High","gaps":["Whether activation occurs on unphosphorylated kinase unresolved","Cellular regulation of the interaction not addressed"]},{"year":2004,"claim":"Dissected TPX2 into separable functional modules, showing the N-terminus binds/nucleates microtubules and the C-terminus mediates RanGTP-dependent spindle assembly in a factor network.","evidence":"Domain truncation/add-back in Xenopus egg extract with in vitro MT polymerization assays","pmids":["15385625"],"confidence":"High","gaps":["Identity of C-terminal network partners undefined","Mechanism of nucleation by N-terminus not molecularly resolved"]},{"year":2006,"claim":"Placed TPX2/Aurora A within a Plk1-headed hierarchical cascade and revealed a postmitotic nuclear-assembly role via LAP2, broadening TPX2 function beyond spindle MTs.","evidence":"RNAi epistasis in mammalian cells; Xenopus nuclear assembly extract depletion with LAP2 pulldown","pmids":["16418575","16735579"],"confidence":"Medium","gaps":["Direct vs indirect Plk1–TPX2 link unclear","TPX2–LAP2 interaction mechanism limited to single study"]},{"year":2008,"claim":"Defined the C-terminal Eg5-interacting domain as driving spindle pole segregation and showed TPX2 controls meiotic spindle pole integrity via Aurora A–TACC3, distinguishing motor-regulatory from kinase-activation roles.","evidence":"Xenopus embryo microinjection with Eg5 rescue; mouse oocyte RNAi with live imaging","pmids":["18372177","18833336"],"confidence":"Medium","gaps":["Biophysical mode of Eg5 regulation not resolved","Single-lab in vivo systems"]},{"year":2010,"claim":"Showed TPX2 stabilizes Aurora A against APC/C-Cdh1 proteasomal degradation, establishing a kinase-activity-independent function of the Aurora A–binding region.","evidence":"siRNA, proteasome inhibition, and domain-specific rescue with Co-IP in human cells","pmids":["21147853"],"confidence":"High","gaps":["Direct competition with degradation machinery not structurally defined"]},{"year":2012,"claim":"Demonstrated in vivo essentiality and tumor-suppressive dosage sensitivity, and uncovered a nuclear DNA-damage-response role, expanding TPX2 beyond mitosis.","evidence":"Conditional Tpx2 knockout mouse genetics with tumor analysis; siRNA + ionizing radiation with γ-H2AX readouts, Co-IP for MDC1/ATM, and pharmacological epistasis","pmids":["22266221","23045526"],"confidence":"High","gaps":["Mechanism of TPX2 recruitment to DSBs undefined","Whether DDR role requires Aurora A unresolved at this stage"]},{"year":2014,"claim":"Resolved that TPX2 allosterically activates even dephosphorylated Aurora A and linked nuclear TPX2 to H4K16ac maintenance via SIRT1 and to CPC scaffolding, refining both the activation model and TPX2's chromatin roles.","evidence":"X-ray crystallography/NMR of dephospho Aurora A–TPX2 dimer; Co-IP and siRNA for SIRT1/H4K16ac; Xenopus extract depletion and in vitro Aurora B kinase assays","pmids":["24867643","25365214","22560880"],"confidence":"High","gaps":["SIRT1 and CPC links rest on single Medium-confidence studies","Physiological balance between Aurora A and Aurora B activation unclear"]},{"year":2015,"claim":"Reconstituted TPX2's intrinsic microtubule nucleation and Eg5-inhibitory activities with purified proteins, and identified CDK1/2 phosphorylation at Thr72 as a spindle-localization switch, converting cellular phenotypes into defined biochemical mechanisms.","evidence":"In vitro TIRF reconstitution with chTOG and importins; single-molecule Eg5 assays; in vitro CDK kinase assays with phospho-mutant cell biology; neuronal kinesin-5 domain rescue","pmids":["26414402","26018074","25688093","26257190"],"confidence":"High","gaps":["Relationship between MT stabilization and γ-TuRC activation not yet integrated","In vivo significance of Thr72 phosphorylation limited to one study"]},{"year":2016,"claim":"Mechanistically explained TPX2's effect on MT dynamics as suppression of tubulin off-rates, mapped Kif15 regulation to the C-terminus, and defined an allosteric Aurora A–TPX2 inhibition pocket, advancing both dynamics and druggability.","evidence":"Quantitative in vitro TIRF assays with simulations; domain-deletion kinesin assays in cells and in vitro; X-ray crystallography of the AurkinA Y-pocket inhibitor; overexpression phenotypes in RPE-1 cells","pmids":["26869224","27852894","27339427","32041138"],"confidence":"High","gaps":["Quantitative dynamics model from single lab","Excess-TPX2 nuclear phenotype mechanism Aurora A-independent but otherwise unresolved"]},{"year":2017,"claim":"Defined the structural basis of TPX2–microtubule binding and the γ-TuRC nucleation-activator motifs, separating general MT binding from branching-nucleation activation and explaining importin competition.","evidence":"Cryo-EM of TPX2 on the MT surface with in vitro reconstitution; separation-of-function mutagenesis with γ-TuRC binding and branching assays in Xenopus extract","pmids":["29120325","28264915"],"confidence":"High","gaps":["Structure of the TPX2–γ-TuRC complex not resolved","How phosphorylation modulates these interfaces unclear"]},{"year":2019,"claim":"Established a TPX2/Aurora A–53BP1 axis controlling homologous recombination and stalled-fork protection, and identified CDK5-Ser486 phosphorylation as a stability/tumorigenicity driver, deepening interphase and oncogenic functions.","evidence":"Co-IP, siRNA epistasis with DNA fiber and HR reporter assays; phosphoproteomics with CDK5 kinase assays and xenografts","pmids":["30602538","31272499"],"confidence":"Medium","gaps":["Single-lab Co-IP/epistasis for the 53BP1 axis","Direct vs indirect CDK5 effect on TPX2 stability not fully resolved"]},{"year":2020,"claim":"Demonstrated that TPX2 drives microtubule nucleation by phase-separating into a tubulin co-condensate on pre-existing microtubules, with importin-α/β inhibiting condensation, providing a biophysical basis for branching nucleation and its spatial control.","evidence":"In vitro phase separation and cytosol-based nucleation assays with importin competition and truncation analysis","pmids":["31937751"],"confidence":"High","gaps":["Whether condensation is required in vivo not directly tested","Link between condensate and γ-TuRC activation not mechanistically joined"]},{"year":2021,"claim":"Quantified the importin-α/β trimer interaction (including a new NLS), mapped a WDR62-katanin severing axis and a GM130/CDK1-importin-α competition mechanism for local astral-MT activation, integrating spatial regulation of TPX2.","evidence":"ITC/pull-down and NLS mapping with phase-separation assays; in vitro katanin severing reconstitution with Co-IP; phospho-mutant importin-α rescue and spindle-orientation assays","pmids":["34302807","34137789","33526712"],"confidence":"Medium","gaps":["WDR62 and GM130 axes each rest on single Medium-confidence studies","Interplay between multiple spatial cues in cells not unified"]},{"year":2023,"claim":"Linked TPX2 to nuclear Aurora A accumulation driving protumorigenic processes, identified NDC80 as a checkpoint-coupled Aurora A–TPX2 substrate regulated by PP6, and showed TPX2 enhances PXR-driven drug resistance, connecting TPX2 activity to substrate phosphorylation and cancer phenotypes.","evidence":"Co-overexpression with proteasome inhibition and mammosphere assays; PPP6C knockout with NDC80-9A phospho-mutant rescue and phosphoproteomics; Co-IP/ChIP/reporter assays for PXR","pmids":["36797043","36897279","36707511"],"confidence":"Medium","gaps":["Single-lab studies for each mechanism","Direct vs indirect TPX2 contribution to nuclear Aurora A localization not fully separated"]},{"year":2025,"claim":"Identified K249 lactylation as a metabolite-driven PTM that disrupts PP1 binding to Aurora A and enhances Aurora A T288 phosphorylation, connecting metabolic state to TPX2/Aurora A activity and tumor growth.","evidence":"MS site identification, CBP/HDAC1 writer/eraser knockdown, PP1 Co-IP, Aurora A pT288 western blot, and xenograft models","pmids":["40107714"],"confidence":"Medium","gaps":["Single-lab study","Structural basis of lactylation-induced PP1 displacement unresolved"]},{"year":null,"claim":"How TPX2's distinct activities — Aurora A activation, γ-TuRC branching nucleation, phase separation, kinesin regulation, and nuclear DDR/chromatin roles — are coordinated in space and time across the cell cycle, and how its many PTMs are integrated, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structural/functional model of the TPX2–γ-TuRC–tubulin condensate in cells","Cross-talk between mitotic and interphase TPX2 functions undefined","Combinatorial logic of Thr72/Ser486 phosphorylation and K249 lactylation untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,12,34]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,12,16,22]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[15,18,21,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,28,24]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[36]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,15,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,11,13,30]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5,28]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,10,31,35]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[15,22,25]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,24]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,23,36]}],"complexes":["Aurora A–TPX2 complex","TPX2–importin-α/β trimer","Chromosomal Passenger Complex (Aurora B)"],"partners":["AURKA","KPNA2","KPNB1","KIF11","KIF15","WDR62","TP53BP1","SIRT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9ULW0","full_name":"Targeting protein for Xklp2","aliases":["Differentially expressed in cancerous and non-cancerous lung cells 2","DIL-2","Hepatocellular carcinoma-associated antigen 519","Hepatocellular carcinoma-associated antigen 90","Protein fls353","Restricted expression proliferation-associated protein 100","p100"],"length_aa":747,"mass_kda":85.7,"function":"Spindle assembly factor required for normal assembly of mitotic spindles. Required for normal assembly of microtubules during apoptosis. Required for chromatin and/or kinetochore dependent microtubule nucleation. Mediates AURKA localization to spindle microtubules (PubMed:18663142, PubMed:19208764, PubMed:37728657). Activates AURKA by promoting its autophosphorylation at 'Thr-288' and protects this residue against dephosphorylation (PubMed:18663142, PubMed:19208764). TPX2 is inactivated upon binding to importin-alpha (PubMed:26165940). At the onset of mitosis, GOLGA2 interacts with importin-alpha, liberating TPX2 from importin-alpha, allowing TPX2 to activate AURKA kinase and stimulate local microtubule nucleation (PubMed:26165940)","subcellular_location":"Nucleus; Cytoplasm, cytoskeleton, spindle; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/Q9ULW0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TPX2","classification":"Common 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revealed the molecular mechanism of Aurora-A activation: TPX2 binding pulls on the Aurora-A activation segment, swinging the phosphothreonine (pThr) into a buried position and locking the active conformation, while also protecting pThr from phosphatase-mediated dephosphorylation. No global conformational changes in the kinase are induced.\",\n      \"method\": \"X-ray crystallography (crystal structures of Aurora-A ± TPX2 fragment), biochemical kinase activity assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with functional validation, foundational mechanism paper replicated by multiple subsequent structural studies\",\n      \"pmids\": [\"14580337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human TPX2 directly binds the C-terminal catalytic domain of Aurora-A via its N-terminus (reciprocal co-IP from mitotic HeLa extracts and direct binding studies). TPX2 is required for targeting Aurora-A to spindle microtubules (not spindle poles); depletion of TPX2 by siRNA abolishes Aurora-A association with microtubules. Conversely, Aurora-A depletion has no effect on TPX2 localization. Aurora-A phosphorylates TPX2.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, mass spectrometry identification, siRNA knockdown, immunofluorescence localization, in vitro binding and kinase assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with MS identification plus siRNA phenotype, replicated across multiple subsequent studies\",\n      \"pmids\": [\"12177045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Xenopus TPX2 is a microtubule-associated protein required for spindle pole organization. It is nuclear during interphase and localizes to spindle poles in mitosis in a dynein-dynactin-dependent manner. Immunodepletion from mitotic egg extracts causes bipolar structures with disintegrating poles and decreased microtubule density; excess TPX2 causes monopolar structures with enlarged poles. TPX2 also targets Xklp2 to microtubule minus ends.\",\n      \"method\": \"Xenopus egg extract immunodepletion/add-back, immunofluorescence, biochemical fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunodepletion with rescue, multiple orthogonal functional readouts, foundational study replicated widely\",\n      \"pmids\": [\"10871281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In Xenopus, Aurora A autophosphorylation requires only Thr-295 for activity. TPX2 binding activates Aurora A and leads to phosphorylation of three Ser residues in the N-terminus of TPX2; mutation of these sites does not affect Aurora A activation. Mutation of a putative Aurora A-binding motif in TPX2 abolishes both TPX2 phosphorylation and Aurora A activation. p53 blocks Aurora A activity, and TPX2 inhibits this p53-mediated inhibition.\",\n      \"method\": \"In vitro kinase assays, site-directed mutagenesis, biochemical binding assays with Xenopus proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab but multiple orthogonal experiments\",\n      \"pmids\": [\"14701852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Domain analysis of Xenopus TPX2 shows: the large N-terminal domain (containing the Aurora A binding peptide) directly binds microtubules and nucleates MTs in pure tubulin but cannot rescue spindle assembly in TPX2-depleted extract. The large C-terminal domain (lacking Aurora A binding) does not bind pure MTs directly but rescues RanGTP-dependent microtubule nucleation and spindle assembly in depleted extract, indicating the C-terminus functions in a network with other RanGTP-regulated factors.\",\n      \"method\": \"Xenopus egg extract immunodepletion, domain truncation/add-back experiments, in vitro MT polymerization assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution combined with domain dissection in extract, multiple constructs tested\",\n      \"pmids\": [\"15385625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Aurora-A and Plk1 are part of a hierarchical signaling cascade in spindle formation: Plk1 controls the localization of Aurora-A to centrosomes and TPX2 recruitment to microtubules. Aurora-A and TPX2 are required for centriole cohesion and spindle bipolarity; TPX2 also contributes to centrosome maturation independently of its microtubule organization role.\",\n      \"method\": \"RNA interference knockdown of Aurora-A, Plk1, and TPX2 individually and in combination, immunofluorescence, epistasis analysis in mammalian cells\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis by RNAi with defined cellular phenotypes, single lab\",\n      \"pmids\": [\"16418575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The C-terminal domain of Xenopus TPX2 contains a discrete Eg5-interacting domain. Injection of TPX2-C-terminus into embryos causes spindle collapse and failure of pole segregation; these phenotypes require the Eg5-binding region and are rescued by Eg5 injection. This defines a novel Eg5-dependent role of TPX2 C-terminus in spindle pole segregation.\",\n      \"method\": \"Xenopus embryo microinjection, Xenopus S3 cell transfection, in vitro binding assays, live imaging\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo rescue experiments with deletion constructs and Eg5 injection, single lab\",\n      \"pmids\": [\"18372177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In mouse oocytes, TPX2 protein accumulates from meiosis I to II and controls spindle assembly via two distinct functions: (1) microtubule assembly regulation and (2) spindle pole integrity via Aurora A-dependent phosphorylation of TACC3, a regulator of MTOC activity. RNAi depletion of TPX2 and live imaging demonstrated these requirements.\",\n      \"method\": \"RNAi depletion, live cell imaging, immunofluorescence, mouse oocyte meiotic system\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with live imaging and defined phenotypic readouts, single lab\",\n      \"pmids\": [\"18833336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TPX2 protects Aurora-A from proteasomal degradation in both interphase and mitosis in human cells. Aurora-A levels decrease in TPX2-silenced G2 and prometaphase cells in a proteasome- and Cdh1/APC-C-dependent manner. Reintroduction of full-length TPX2 or its Aurora-A-binding region restores Aurora-A levels; a truncated TPX2 lacking this domain cannot. This stability function is independent of TPX2's ability to activate Aurora-A or localize it to the spindle.\",\n      \"method\": \"siRNA silencing, proteasome inhibitor treatment, rescue with truncation constructs, co-immunoprecipitation, immunofluorescence, western blotting in human cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA with domain-specific rescue, multiple orthogonal methods in one study, mechanistically distinct from prior findings\",\n      \"pmids\": [\"21147853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TPX2 acts as a scaffold and co-activator of the Chromosomal Passenger Complex (CPC): immunodepletion of TPX2 from Xenopus egg extracts decreases Aurora B-Survivin and Aurora B-INCENP interactions, reducing Aurora B activity. TPX2 residues 138–328 are sufficient to enhance Aurora B-Survivin association and Aurora B kinase activity in vitro. Overexpression of this region in HeLa cells causes metaphase chromosome alignment defects and INCENP mislocalization.\",\n      \"method\": \"Xenopus egg extract immunodepletion, in vitro Aurora B kinase assays, HeLa cell transfection, immunofluorescence\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunodepletion and in vitro reconstitution with defined domain, single lab\",\n      \"pmids\": [\"22560880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TPX2 is required for spindle function and chromosome segregation in the mouse embryo. Conditional Tpx2 knockout in primary mouse cultures causes deficient microtubule nucleation from DNA and aberrant spindles during prometaphase, with cells exiting mitosis without chromosome segregation. Tpx2 haploinsufficiency leads to aneuploidy accumulation in vivo and increased susceptibility to spontaneous lymphomas and lung tumors.\",\n      \"method\": \"Conditional null mouse genetics, primary cell culture, immunofluorescence, flow cytometry, in vivo tumor analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse knockout with multiple orthogonal phenotypic readouts, genetically rigorous\",\n      \"pmids\": [\"22266221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nuclear TPX2 plays a role in the DNA double-strand break response: loss of TPX2 leads to aberrantly high and transient accumulation of γ-H2AX (Ser139-phosphorylated H2AX) at G0/G1 after ionizing radiation, with more numerous high-intensity γ-H2AX foci. Overexpression reduces γ-H2AX after IR. TPX2 accumulates at DSBs and associates (by co-IP) with MDC1 and ATM. Pharmacological inhibition or depletion of ATM or MDC1 (but not DNA-PK) antagonizes the γ-H2AX phenotype caused by TPX2 depletion.\",\n      \"method\": \"siRNA depletion, ionizing radiation, γ-H2AX immunofluorescence and flow cytometry, co-immunoprecipitation, pharmacological inhibitors, cell fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus siRNA with pharmacological epistasis, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"23045526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Elucidate molecular mechanism of Aurora A autophosphorylation as intermolecular in a long-lived dimer (resolved by X-ray crystallography and functional assays). TPX2 allosterically activates dephosphorylated Aurora A by binding a conserved hydrophobic groove, shifting the equilibrium toward the active conformation—distinct from phosphorylation-mediated activation. Crystal structure of dephosphorylated Aurora A-TPX2(1-25) domain-swapped dimer reported.\",\n      \"method\": \"X-ray crystallography, NMR, functional kinase assays, site-directed mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus functional assays plus mutagenesis in one rigorous study, resolves prior mechanistic controversy\",\n      \"pmids\": [\"24867643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nuclear TPX2 constitutively controls the levels of histone H4 acetylated at Lys16 (H4K16ac) during G1 phase: TPX2 depletion decreases H4K16ac, and this decrease correlates with increased γ-H2AX after IR. TPX2 interacts (by co-IP) with SIRT1, which is identified as a novel TPX2 complex partner. TPX2 depletion also impairs 53BP1 ionizing radiation-induced foci formation.\",\n      \"method\": \"siRNA depletion, immunofluorescence, flow cytometry, co-immunoprecipitation, western blot for H4K16ac\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP and siRNA phenotype, single lab, mechanistically novel but limited to single study\",\n      \"pmids\": [\"25365214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TPX2 levels modulate meiotic spindle size and architecture in Xenopus through Eg5: elevated TPX2 in X. tropicalis extracts reduces spindle length and recruits Eg5 to poles, increasing MT density there. Higher TPX2 partitions MTs between an antiparallel array (spindle expansion) and a parallel cross-linked architecture at spindle poles via Eg5.\",\n      \"method\": \"Xenopus egg extract manipulation, TPX2 immunodepletion and add-back, Eg5 inhibition, immunofluorescence quantification\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — extract manipulation with multiple orthogonal tests, single lab\",\n      \"pmids\": [\"25070954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Human TPX2 directly stabilizes growing microtubule ends and stimulates microtubule nucleation by stabilizing early nucleation intermediates (using in vitro reconstitution with purified proteins). chTOG alone only weakly promotes nucleation but acts synergistically with TPX2. Importins block TPX2 interaction with nucleation intermediates selectively, controlling nucleation efficiency.\",\n      \"method\": \"In vitro dynamic reconstitution assays with purified human proteins, TIRF microscopy, importin competition assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins and TIRF microscopy, defined mechanism with importin epistasis\",\n      \"pmids\": [\"26414402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TPX2 inhibits the mitotic kinesin Eg5 through two mechanisms: (1) direct binding to microtubules (apparent Kd ~200 nM, independent of tubulin C-terminal tails) and (2) interaction with the Eg5 motor/neck region requiring Eg5 dimerization. Full-length TPX2 dramatically reduces Eg5 velocity in single-molecule TIRF assays; a C-terminal truncation lacking the Eg5-binding domain is a less effective inhibitor.\",\n      \"method\": \"TIRF single-molecule assays, microtubule gliding assays, co-sedimentation, fluorescence microscopy with mammalian cell extracts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro single-molecule reconstitution with purified proteins and defined truncation constructs\",\n      \"pmids\": [\"26018074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TPX2 regulates neuronal morphology through its kinesin-5 (Eg5) interacting domain: TPX2 depletion from cultured neurons speeds axon outgrowth similarly to kinesin-5 inhibition; re-expression of TPX2 rescues the phenotype, but not if the kinesin-5-interacting domain is deleted.\",\n      \"method\": \"siRNA depletion, domain-deletion rescue in primary cultured neurons, morphological quantification\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA with domain-specific rescue, single lab, two orthogonal approaches\",\n      \"pmids\": [\"26257190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TPX2 suppresses tubulin subunit off-rates from microtubule ends during both assembly and disassembly, enabling unprecedentedly slow plus-end growth rates and dramatically reduced shortening rates. Computational simulations explain these dynamics by a moderate increase in tubulin-tubulin bond strength upon TPX2 lattice association.\",\n      \"method\": \"In vitro TIRF microscopy-based dynamic MT assembly assays, computational simulations\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro reconstitution with computational modeling, single lab\",\n      \"pmids\": [\"26869224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AurkinA, a small-molecule inhibitor of the Aurora A-TPX2 PPI, binds to a hydrophobic 'Y-pocket' on Aurora A that normally accommodates a conserved Tyr-Ser-Tyr motif from TPX2, inducing structural changes that inhibit catalytic activity without affecting ATP binding. This defines an allosteric inhibition mechanism and confirms the Y-pocket as a key regulatory site. Cells exposed to AurkinA mislocalize Aurora A from spindle microtubules.\",\n      \"method\": \"X-ray crystallography, in vitro kinase assays, cell-based immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional assays and cellular validation, defines novel allosteric mechanism\",\n      \"pmids\": [\"27339427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The C-terminal domain of TPX2 contributes to localization and motility of both Eg5 and Kif15 (kinesin-12) to spindle microtubules in cells, and suppresses Kif15 motor walking in vitro. Kif15-dependent bipolar spindle formation in the absence of Eg5 activity requires the C-terminal domain of TPX2. Kif15 puncta move toward the spindle equator at a rate equivalent to microtubule growth; paclitaxel treatment suppresses this movement.\",\n      \"method\": \"TPX2 domain deletion/rescue in cells, in vitro single-molecule kinesin assays, live cell imaging, paclitaxel treatment\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo domain-deletion experiments with defined kinesin phenotypes, single lab\",\n      \"pmids\": [\"27852894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of a central region of TPX2 bound to the microtubule surface shows TPX2 uses two flexibly linked elements ('ridge' and 'wedge') to simultaneously bind across longitudinal and lateral tubulin interfaces. These MT-interacting elements overlap with the importin-binding site on TPX2. Fluorescence microscopy-based in vitro reconstitution assays confirm this interaction mode is critical for MT binding and nucleation.\",\n      \"method\": \"Cryo-electron microscopy, in vitro MT reconstitution/TIRF microscopy, importin competition assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with functional reconstitution validation, defines the MT-binding mechanism\",\n      \"pmids\": [\"29120325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Structural analysis of Xenopus TPX2 defines its minimal domain for branching MT nucleation, which requires newly identified γ-TuRC nucleation activator motifs (distinct from general MT-binding/bundling ability). Separation-of-function mutations leave TPX2 binding to γ-TuRC intact but abolish branching MT nucleation, indicating TPX2 activates γ-TuRC to promote branching nucleation.\",\n      \"method\": \"Domain truncation/mutation analysis, γ-TuRC binding assays, Xenopus egg extract branching MT nucleation assays, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — separation-of-function mutagenesis with in vitro reconstitution and binding assays, single rigorous study\",\n      \"pmids\": [\"28264915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5 phosphorylates TPX2 at serine 486, promoting TPX2 protein stability (phosphorylation-dependent stabilization). This CDK5-mediated phosphorylation and stabilization of TPX2 promotes hepatocellular proliferation and tumorigenicity; TPX2 silencing restores normal migration in CDK5-overexpressing HCC cells.\",\n      \"method\": \"Comparative phosphoproteomics screening, in vitro and in vivo CDK5 kinase assays, site-directed mutagenesis (S486), western blot, xenograft models\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus in vitro kinase assay with mutagenesis, single lab\",\n      \"pmids\": [\"31272499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TPX2/Aurora A heterodimer (nominally a mitotic complex) acts as a novel binding partner of 53BP1 in a DNA damage context. Loss of TPX2 or Aurora A compromises DNA end resection, BRCA1 and Rad51 recruitment, and homologous recombination. Loss of TPX2 or Aurora A also causes deprotection of stalled replication forks by failing to counteract MRE11 nuclease activity. Concurrent 53BP1 loss rescues BRCA1/Rad51 recruitment and fork instability upon TPX2 loss.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, DNA fiber assays, HR reporter assays, epistasis by double knockdown\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus siRNA epistasis with multiple orthogonal DNA repair assays, single lab\",\n      \"pmids\": [\"30602538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TPX2 phase separates into a co-condensate with tubulin, which mediates microtubule nucleation in vitro and in isolated cytosol. Co-condensation preferentially occurs on pre-existing microtubules (site of branching nucleation) at endogenous TPX2 concentrations. Importin-α/β heterodimer inhibits TPX2 condensation in vitro, thereby inhibiting branching MT nucleation activity in cytosol.\",\n      \"method\": \"In vitro phase separation assays, droplet formation microscopy, cytosol-based MT nucleation assays, importin competition, TPX2 truncation/chimera analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of phase separation combined with functional nucleation assays and importin regulation, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"31937751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Excess TPX2 causes aberrantly stable microtubules at mitotic exit that interfere with nuclear reconstitution and lamin B1 network assembly, resulting in doughnut-shaped daughter nuclei. This phenotype is independent of TPX2's interaction with Aurora-A (shown using a truncated TPX2 unable to bind Aurora-A).\",\n      \"method\": \"TPX2 overexpression (full-length and Aurora-A-binding truncation) in non-transformed hTERT RPE-1 cells, immunofluorescence, live imaging\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific overexpression with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"32041138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TPX2 interacts with importin-α/β in a 1:1:1 monodispersed trimer with nanomolar affinity. A new nuclear localization sequence in TPX2 contributes to high-affinity importin-α binding; TPX2 also interacts with importin-β via dispersed weak interactions. Both importin-α and importin-β interactions inhibit TPX2 phase separation, which enhances branching MT nucleation.\",\n      \"method\": \"Biochemical binding assays (ITC, pull-down), NLS mapping, phase separation assays with importin competition, size exclusion chromatography\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding assays (ITC) plus phase separation reconstitution, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"34302807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WDR62 functions as an adaptor protein between TPX2/Aurora A and katanin at the spindle pole: TPX2/Aurora A recruits WDR62 to the spindle pole; WDR62 complexed with TPX2/Aurora A (but not WDR62 alone) potently promotes katanin-mediated severing of GDP-MTs in vitro. A TPX2-Aurora A-WDR62-katanin signaling axis in cells regulates spindle dynamics.\",\n      \"method\": \"Co-IP, in vitro MT severing reconstitution, domain binding assays, spindle pole fractionation, live cell imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reconstitution plus cellular co-IP, single lab\",\n      \"pmids\": [\"34137789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TPX2 regulates astral microtubule assembly and spindle orientation: GM130 on Golgi membranes activates TPX2 locally by competing with importin-α1 (KPNA2) for TPX2 binding. CDK1 phosphorylates importin-α at serine 62 during mitosis, switching its substrate preference from TPX2 to GM130 and thereby enabling competition-based TPX2 activation. Importin-α S62A mutation impedes local TPX2 activation, compromises astral MT formation, and results in misoriented spindles.\",\n      \"method\": \"Co-immunoprecipitation, phospho-specific mutants of importin-α, RNAi, immunofluorescence, spindle orientation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with phospho-mutant rescue experiments, single lab, two orthogonal methods\",\n      \"pmids\": [\"33526712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Aurora A nuclear localization is promoted by co-overexpression with TPX2 and counteracted by proteasomal degradation. TPX2 co-overexpression (but not Aurora A overexpression alone) is required for Aurora A nuclear accumulation in interphase. In MCF10A mammospheres, TPX2 co-overexpression drives protumorigenic processes downstream of nuclear Aurora A. AURKA, TPX2, and the import regulator CSE1L are co-overexpressed in tumors.\",\n      \"method\": \"Co-overexpression experiments, proteasome inhibitor treatment, immunofluorescence quantification of nuclear localization, mammosphere assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-overexpression with proteasome inhibition and domain-specific constructs, single lab\",\n      \"pmids\": [\"36797043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PP6 (phosphatase, PPP6C catalytic subunit) regulates Aurora A-TPX2 complex activity at kinetochores: loss of PP6 amplifies Aurora A activity and enlarges spindles with defective chromosome separation. Aurora A-TPX2 phosphorylates NDC80 on multiple N-terminal sites exclusively at checkpoint-silenced, MT-attached kinetochores; NDC80 phospho-deficient 9A mutant reduces spindle size and suppresses nuclear structure defects in PPP6C KO cells. NDC80 phosphorylation is Aurora B-independent.\",\n      \"method\": \"Phosphoproteomics, genetic knockout (PPP6C), phospho-specific antibodies, NDC80-9A mutant rescue, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO combined with phospho-mutant rescue and substrate identification, single lab\",\n      \"pmids\": [\"36897279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Phosphorylation of TPX2 at Thr72 by CDK1/2 (in vitro and in vivo, cell cycle-dependent, peaking at M phase) regulates TPX2 spindle localization: endogenous TPX2-pThr72 does not associate with spindle; GFP-TPX2 T72A (non-phosphorylatable) preferentially concentrates on the spindle compared to wild-type. T72A overexpression increases multipolar spindles and is associated with elevated Aurora A and Eg5 activity.\",\n      \"method\": \"In vitro CDK1/2 kinase assays, phospho-specific antibody generation, cell cycle synchronization, GFP-TPX2 mutant transfection, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus phospho-mutant cell biology, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"25688093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TPX2 is required for postmitotic nuclear assembly: depletion of TPX2 from Xenopus nuclear assembly extracts produces nuclei ~1/5 the size of controls. TPX2 interacts (by pulldown) with LAP2 (lamina-associated polypeptide 2), and LAP2 localization is disrupted in TPX2-depleted nuclei, suggesting the TPX2-LAP2 interaction is required for proper nuclear reformation.\",\n      \"method\": \"Xenopus egg extract immunodepletion, nuclear assembly assay, size quantification, co-immunoprecipitation/pulldown for TPX2-LAP2 interaction\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunodepletion with mechanistic pulldown, single lab\",\n      \"pmids\": [\"16735579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TPX2(1-43) binding to Aurora A increases catalytic efficiency by increasing binding affinity for both ATP and peptide substrate. TPX2 binding does not change the reaction mechanism (rapid equilibrium random mechanism) or turnover number. TPX2 binding decreases the size and accessibility of a hydrophobic pocket adjacent to the ATP site, altering inhibitor SAR.\",\n      \"method\": \"In vitro kinase assays with purified proteins, enzyme kinetics (Km/Vmax determination), computer modeling\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro kinetic analysis with computational modeling, single lab\",\n      \"pmids\": [\"17705509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPX2 is lactylated at K249 in HCC tumor tissues; this modification is written by CBP (lactylase) and erased by HDAC1. TPX2 lactylation is required for cell cycle progression and tumor growth. Mechanistically, TPX2 K249 lactylation disrupts PP1 binding to Aurora A, enhances Aurora A T288 phosphorylation, and facilitates cell cycle progression.\",\n      \"method\": \"Mass spectrometry identification of lactylation site, CBP/HDAC1 knockdown, PP1 co-immunoprecipitation, Aurora A pT288 western blot, xenograft tumor models\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific PTM identification with writer/eraser and mechanistic downstream validation, single lab\",\n      \"pmids\": [\"40107714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TPX2 directly interacts with PXR (pregnane X receptor) by co-immunoprecipitation and enhances PXR transcriptional activation of downstream genes (cyp3a4, MDR-1), promoting sorafenib resistance in HCC cells. Overexpression of TPX2 increases PXR recruitment to the CYP3A4 PXRE/XREM promoter regions.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, ChIP assay, qPCR, drug metabolism assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus ChIP plus reporter assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"36707511\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TPX2 is a multifunctional microtubule-associated spindle assembly factor that: (1) binds the N-terminal domain of Aurora A kinase, allosterically activating it by burying the phosphothreonine in the active conformation and protecting it from dephosphorylation, while also stabilizing Aurora A protein against APC/C-Cdh1-mediated proteasomal degradation; (2) promotes microtubule nucleation by stabilizing nucleation intermediates, suppressing tubulin off-rates, co-condensing with tubulin via phase separation on pre-existing MTs, and activating the γ-TuRC via dedicated nucleation activator motifs; (3) regulates mitotic motor proteins Eg5 and Kif15 through its C-terminal domain; (4) is controlled spatially by importin-α/β, which sequesters TPX2 (inhibiting its phase separation and MT-nucleation activities) until released by RanGTP near chromosomes; (5) functions in the nucleus during interphase to amplify the DNA damage response via ATM/MDC1 and to maintain H4K16 acetylation; (6) undergoes regulatory post-translational modifications including CDK1/2-mediated phosphorylation at Thr72 (regulating spindle localization), CDK5-mediated phosphorylation at Ser486 (promoting protein stability), and lactylation at K249 (disrupting PP1 binding to Aurora A to enhance its activity).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TPX2 is a Ran-regulated, microtubule-associated spindle assembly factor that couples Aurora A kinase activation to spatially controlled microtubule nucleation during mitosis [#2, #1, #15]. Through its N-terminus it directly binds the Aurora A catalytic domain and allosterically activates the kinase by pulling on the activation segment to bury the phosphothreonine in the active conformation and shield it from phosphatase action, an activation that operates even on dephosphorylated Aurora A and increases catalytic efficiency by raising affinity for ATP and substrate [#0, #12, #34]; the same interaction targets Aurora A to spindle microtubules and protects it from APC/C-Cdh1–dependent proteasomal degradation independently of kinase activation [#1, #8]. TPX2 promotes microtubule assembly by directly stabilizing nucleation intermediates and growing plus ends, suppressing tubulin off-rates, and co-condensing with tubulin via phase separation on pre-existing microtubules, and it activates γ-TuRC-dependent branching nucleation through dedicated nucleation-activator motifs that bind tubulin across longitudinal and lateral interfaces using flexibly linked 'ridge' and 'wedge' elements [#15, #18, #25, #22, #21]. Its C-terminal domain regulates the mitotic kinesins Eg5 and Kif15, controlling spindle pole segregation, spindle size, and motor motility [#6, #16, #20, #14]. These activities are spatially gated by importin-α/β, which binds TPX2 with nanomolar affinity over a region overlapping its microtubule- and nucleation-interaction surfaces and inhibits its phase separation until released by RanGTP or by competing factors such as GM130 near membranes and chromatin [#27, #21, #25, #29]. TPX2 is essential for spindle bipolarity and faithful chromosome segregation in vivo, and its haploinsufficiency drives aneuploidy and tumorigenesis [#10, #2]. Beyond mitosis, nuclear TPX2 amplifies the DNA double-strand break response through ATM/MDC1 and an Aurora A–53BP1 axis governing end resection and fork protection, and maintains H4K16 acetylation via SIRT1 [#11, #24, #13]. TPX2 activity is further tuned by CDK1/2 phosphorylation at Thr72 governing spindle localization, CDK5 phosphorylation at Ser486 promoting stability, and K249 lactylation that disrupts PP1 binding to Aurora A to enhance kinase activity [#32, #23, #35].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established TPX2 as a microtubule-associated protein essential for spindle pole organization, answering whether a dedicated factor links chromatin-proximal microtubule density to bipolar spindle architecture.\",\n      \"evidence\": \"Xenopus egg extract immunodepletion/add-back with immunofluorescence and motor-targeting assays\",\n      \"pmids\": [\"10871281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular activity driving nucleation undefined\", \"No mechanism linking TPX2 to a kinase partner yet\", \"Ran/importin regulation not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified Aurora A as a direct TPX2 partner and showed TPX2 targets Aurora A to spindle microtubules, defining the physical link between a spindle MAP and a mitotic kinase.\",\n      \"evidence\": \"Reciprocal Co-IP with MS, siRNA knockdown, immunofluorescence, and in vitro binding/kinase assays in human cells\",\n      \"pmids\": [\"12177045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of activation not resolved\", \"Functional consequence of TPX2 phosphorylation unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved the structural mechanism of Aurora A activation, showing TPX2 swings the phosphothreonine into a buried active position and shields it from dephosphorylation without global conformational change.\",\n      \"evidence\": \"X-ray crystallography of Aurora A ± TPX2 fragment with kinase activity assays; supported by in vitro mutagenesis defining the Aurora A–binding motif\",\n      \"pmids\": [\"14580337\", \"14701852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether activation occurs on unphosphorylated kinase unresolved\", \"Cellular regulation of the interaction not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Dissected TPX2 into separable functional modules, showing the N-terminus binds/nucleates microtubules and the C-terminus mediates RanGTP-dependent spindle assembly in a factor network.\",\n      \"evidence\": \"Domain truncation/add-back in Xenopus egg extract with in vitro MT polymerization assays\",\n      \"pmids\": [\"15385625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of C-terminal network partners undefined\", \"Mechanism of nucleation by N-terminus not molecularly resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed TPX2/Aurora A within a Plk1-headed hierarchical cascade and revealed a postmitotic nuclear-assembly role via LAP2, broadening TPX2 function beyond spindle MTs.\",\n      \"evidence\": \"RNAi epistasis in mammalian cells; Xenopus nuclear assembly extract depletion with LAP2 pulldown\",\n      \"pmids\": [\"16418575\", \"16735579\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect Plk1–TPX2 link unclear\", \"TPX2–LAP2 interaction mechanism limited to single study\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the C-terminal Eg5-interacting domain as driving spindle pole segregation and showed TPX2 controls meiotic spindle pole integrity via Aurora A–TACC3, distinguishing motor-regulatory from kinase-activation roles.\",\n      \"evidence\": \"Xenopus embryo microinjection with Eg5 rescue; mouse oocyte RNAi with live imaging\",\n      \"pmids\": [\"18372177\", \"18833336\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biophysical mode of Eg5 regulation not resolved\", \"Single-lab in vivo systems\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed TPX2 stabilizes Aurora A against APC/C-Cdh1 proteasomal degradation, establishing a kinase-activity-independent function of the Aurora A–binding region.\",\n      \"evidence\": \"siRNA, proteasome inhibition, and domain-specific rescue with Co-IP in human cells\",\n      \"pmids\": [\"21147853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct competition with degradation machinery not structurally defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated in vivo essentiality and tumor-suppressive dosage sensitivity, and uncovered a nuclear DNA-damage-response role, expanding TPX2 beyond mitosis.\",\n      \"evidence\": \"Conditional Tpx2 knockout mouse genetics with tumor analysis; siRNA + ionizing radiation with γ-H2AX readouts, Co-IP for MDC1/ATM, and pharmacological epistasis\",\n      \"pmids\": [\"22266221\", \"23045526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TPX2 recruitment to DSBs undefined\", \"Whether DDR role requires Aurora A unresolved at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved that TPX2 allosterically activates even dephosphorylated Aurora A and linked nuclear TPX2 to H4K16ac maintenance via SIRT1 and to CPC scaffolding, refining both the activation model and TPX2's chromatin roles.\",\n      \"evidence\": \"X-ray crystallography/NMR of dephospho Aurora A–TPX2 dimer; Co-IP and siRNA for SIRT1/H4K16ac; Xenopus extract depletion and in vitro Aurora B kinase assays\",\n      \"pmids\": [\"24867643\", \"25365214\", \"22560880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SIRT1 and CPC links rest on single Medium-confidence studies\", \"Physiological balance between Aurora A and Aurora B activation unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Reconstituted TPX2's intrinsic microtubule nucleation and Eg5-inhibitory activities with purified proteins, and identified CDK1/2 phosphorylation at Thr72 as a spindle-localization switch, converting cellular phenotypes into defined biochemical mechanisms.\",\n      \"evidence\": \"In vitro TIRF reconstitution with chTOG and importins; single-molecule Eg5 assays; in vitro CDK kinase assays with phospho-mutant cell biology; neuronal kinesin-5 domain rescue\",\n      \"pmids\": [\"26414402\", \"26018074\", \"25688093\", \"26257190\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between MT stabilization and γ-TuRC activation not yet integrated\", \"In vivo significance of Thr72 phosphorylation limited to one study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mechanistically explained TPX2's effect on MT dynamics as suppression of tubulin off-rates, mapped Kif15 regulation to the C-terminus, and defined an allosteric Aurora A–TPX2 inhibition pocket, advancing both dynamics and druggability.\",\n      \"evidence\": \"Quantitative in vitro TIRF assays with simulations; domain-deletion kinesin assays in cells and in vitro; X-ray crystallography of the AurkinA Y-pocket inhibitor; overexpression phenotypes in RPE-1 cells\",\n      \"pmids\": [\"26869224\", \"27852894\", \"27339427\", \"32041138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative dynamics model from single lab\", \"Excess-TPX2 nuclear phenotype mechanism Aurora A-independent but otherwise unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the structural basis of TPX2–microtubule binding and the γ-TuRC nucleation-activator motifs, separating general MT binding from branching-nucleation activation and explaining importin competition.\",\n      \"evidence\": \"Cryo-EM of TPX2 on the MT surface with in vitro reconstitution; separation-of-function mutagenesis with γ-TuRC binding and branching assays in Xenopus extract\",\n      \"pmids\": [\"29120325\", \"28264915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the TPX2–γ-TuRC complex not resolved\", \"How phosphorylation modulates these interfaces unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established a TPX2/Aurora A–53BP1 axis controlling homologous recombination and stalled-fork protection, and identified CDK5-Ser486 phosphorylation as a stability/tumorigenicity driver, deepening interphase and oncogenic functions.\",\n      \"evidence\": \"Co-IP, siRNA epistasis with DNA fiber and HR reporter assays; phosphoproteomics with CDK5 kinase assays and xenografts\",\n      \"pmids\": [\"30602538\", \"31272499\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP/epistasis for the 53BP1 axis\", \"Direct vs indirect CDK5 effect on TPX2 stability not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that TPX2 drives microtubule nucleation by phase-separating into a tubulin co-condensate on pre-existing microtubules, with importin-α/β inhibiting condensation, providing a biophysical basis for branching nucleation and its spatial control.\",\n      \"evidence\": \"In vitro phase separation and cytosol-based nucleation assays with importin competition and truncation analysis\",\n      \"pmids\": [\"31937751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether condensation is required in vivo not directly tested\", \"Link between condensate and γ-TuRC activation not mechanistically joined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Quantified the importin-α/β trimer interaction (including a new NLS), mapped a WDR62-katanin severing axis and a GM130/CDK1-importin-α competition mechanism for local astral-MT activation, integrating spatial regulation of TPX2.\",\n      \"evidence\": \"ITC/pull-down and NLS mapping with phase-separation assays; in vitro katanin severing reconstitution with Co-IP; phospho-mutant importin-α rescue and spindle-orientation assays\",\n      \"pmids\": [\"34302807\", \"34137789\", \"33526712\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"WDR62 and GM130 axes each rest on single Medium-confidence studies\", \"Interplay between multiple spatial cues in cells not unified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked TPX2 to nuclear Aurora A accumulation driving protumorigenic processes, identified NDC80 as a checkpoint-coupled Aurora A–TPX2 substrate regulated by PP6, and showed TPX2 enhances PXR-driven drug resistance, connecting TPX2 activity to substrate phosphorylation and cancer phenotypes.\",\n      \"evidence\": \"Co-overexpression with proteasome inhibition and mammosphere assays; PPP6C knockout with NDC80-9A phospho-mutant rescue and phosphoproteomics; Co-IP/ChIP/reporter assays for PXR\",\n      \"pmids\": [\"36797043\", \"36897279\", \"36707511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies for each mechanism\", \"Direct vs indirect TPX2 contribution to nuclear Aurora A localization not fully separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified K249 lactylation as a metabolite-driven PTM that disrupts PP1 binding to Aurora A and enhances Aurora A T288 phosphorylation, connecting metabolic state to TPX2/Aurora A activity and tumor growth.\",\n      \"evidence\": \"MS site identification, CBP/HDAC1 writer/eraser knockdown, PP1 Co-IP, Aurora A pT288 western blot, and xenograft models\",\n      \"pmids\": [\"40107714\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Structural basis of lactylation-induced PP1 displacement unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TPX2's distinct activities — Aurora A activation, γ-TuRC branching nucleation, phase separation, kinesin regulation, and nuclear DDR/chromatin roles — are coordinated in space and time across the cell cycle, and how its many PTMs are integrated, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural/functional model of the TPX2–γ-TuRC–tubulin condensate in cells\", \"Cross-talk between mitotic and interphase TPX2 functions undefined\", \"Combinatorial logic of Thr72/Ser486 phosphorylation and K249 lactylation untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 12, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 12, 16, 22]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [15, 18, 21, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 28, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [36]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 15, 21]},\n      {\"term_id\": \"GO:0005819\", \"supporting_discovery_ids\": [1, 2, 32]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 11, 13, 30]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 10, 31, 35]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [15, 22, 25]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 24]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 23, 36]}\n    ],\n    \"complexes\": [\n      \"Aurora A–TPX2 complex\",\n      \"TPX2–importin-α/β trimer\",\n      \"Chromosomal Passenger Complex (Aurora B)\"\n    ],\n    \"partners\": [\n      \"AURKA\",\n      \"KPNA2\",\n      \"KPNB1\",\n      \"KIF11\",\n      \"KIF15\",\n      \"WDR62\",\n      \"TP53BP1\",\n      \"SIRT1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}