{"gene":"MELK","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1997,"finding":"MELK encodes a protein with a kinase catalytic domain and a leucine zipper motif, identifying it as a new member of the Snf1/AMPK family of serine/threonine kinases. It was initially identified as a maternal gene expressed in mouse eggs and preimplantation embryos.","method":"Differential display analysis of cDNA libraries; sequence analysis of kinase domain and leucine zipper motif","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequence-based classification confirmed by cloning and expression analysis in single study; no functional reconstitution","pmids":["9136115"],"is_preprint":false},{"year":2003,"finding":"MELK interacts with NIPP1 (a spliceosome assembly factor) via the phosphothreonine-binding Forkhead-associated (FHA) domain of NIPP1, dependent on phosphorylation of Thr-478 of MELK. Recombinant MELK potently inhibits an early step of spliceosome assembly in nuclear extracts; a kinase-dead MELK mutant retains this inhibitory effect, but a T478A MELK mutant (which cannot bind NIPP1) does not, demonstrating that MELK inhibits splicing through NIPP1 binding rather than catalytic activity. The NIPP1-MELK interaction is increased in mitotically arrested cells.","method":"Protein interaction assay (FHA domain binding), in vitro spliceosome assembly assay in nuclear extracts, kinase-dead and T478A MELK mutants, mitotic cell lysates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of splicing inhibition with multiple mutants (kinase-dead vs. T478A), mechanistic dissection of NIPP1-dependent pathway","pmids":["14699119"],"is_preprint":false},{"year":2005,"finding":"MELK has broad substrate specificity and does not require a specific phosphorylation-site consensus sequence. Autophosphorylation of Thr167 and Ser171 is required for MELK activation. MELK activity requires reducing agents (DTT or glutathione) and is inhibited by physiological Ca2+ concentrations, with MELK identified as a Ca2+-binding protein. The N-terminal catalytic domain plus the flanking ubiquitin-associated (UBA) domain constitutes the minimal catalytically active fragment. A C-terminal fragment functions as an autoinhibitory domain.","method":"In vitro kinase assays with recombinant MELK, autophosphorylation site mapping (16 sites identified), domain deletion constructs, Ca2+ binding assays, mutagenesis of Thr167/Ser171","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, multiple orthogonal methods in single rigorous study","pmids":["16216881"],"is_preprint":false},{"year":2005,"finding":"MELK (Melk) expression in multipotent neural progenitors (MNPs) is cell cycle regulated. Overexpression of MELK enhances, while knockdown diminishes, neurosphere formation from MNPs, indicating a function in self-renewal. MELK down-regulation down-regulates B-myb expression, which independently mediates MNP proliferation.","method":"siRNA knockdown in MNP cultures, transgenic overexpression, neurosphere formation assay, B-myb expression analysis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with defined cellular readout (neurosphere formation), identification of downstream effector B-myb, single lab","pmids":["16061694"],"is_preprint":false},{"year":2005,"finding":"MELK transcription is regulated by E2F transcription factors; Melk is a bona fide E2F target gene. Transfection studies and site-directed mutagenesis of E2F binding sites in the Melk promoter confirmed this. 1,25-dihydroxyvitamin D3 represses Melk expression through p107/p130 pocket proteins (but not pRb), consistent with E2F4-mediated repression.","method":"Promoter analysis, transfection assays, site-directed mutagenesis of E2F binding sites, p107/p130/pRb knockout cell comparisons","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis of promoter E2F sites plus genetic validation with pocket protein knockout cells; single lab","pmids":["16144839"],"is_preprint":false},{"year":2006,"finding":"The C. elegans MELK ortholog PIG-1 regulates asymmetric neuroblast divisions: pig-1 mutants produce daughter cells of more equal size and the apoptotic daughter is transformed into its sister fate, generating extra neurons. PIG-1/MELK functions like other PAR-1 family members to regulate cell polarity rather than (only) cell cycle.","method":"C. elegans genetic loss-of-function (pig-1 mutants), cell size measurement, cell fate analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic loss-of-function with defined cell size and fate phenotypes in C. elegans ortholog; single lab","pmids":["16774992"],"is_preprint":false},{"year":2006,"finding":"Xenopus MELK (xMELK) is phosphorylated during M-phase on residues T449, T451, and T481 (specifically detected during mitosis), in addition to T414 and S498. MPF (CDK1/cyclin B) and MAPK pathways are responsible for xMELK phosphorylation in vivo; MPF directly phosphorylates xMELK on T481 in vitro. Phosphorylation by MPF and MAPK enhances MELK kinase activity, explaining mitotic activation of MELK.","method":"Phosphorylation site mapping by mass spectrometry in M-phase Xenopus egg extract, in vitro kinase assays with recombinant MPF and MAPK, in vivo phosphorylation analysis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro direct phosphorylation by MPF/MAPK with site mapping, confirmed in vivo; multiple orthogonal methods","pmids":["16628004"],"is_preprint":false},{"year":2007,"finding":"MELK physically interacts with Bcl-GL (long isoform of the pro-apoptotic Bcl-2 family member Bcl-G) via its amino-terminal region. MELK phosphorylates Bcl-GL in vitro (immunocomplex kinase assay). Overexpression of wild-type MELK suppresses Bcl-GL-induced apoptosis, while a kinase-dead MELK (D150A) does not, indicating that MELK kinase activity is required for suppression of Bcl-GL-dependent apoptosis.","method":"Pull-down assay with recombinant wild-type and kinase-dead MELK, immunocomplex kinase assay, TUNEL and FACS apoptosis analysis, siRNA knockdown","journal":"Breast cancer research : BCR","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with substrate identification plus kinase-dead mutant rescue experiment; multiple orthogonal methods","pmids":["17280616"],"is_preprint":false},{"year":2011,"finding":"Xenopus MELK (xMELK) is required for completion of cytokinesis in early embryos. Endogenous xMELK accumulates at the equatorial cortex during anaphase. Overexpression of xMELK impairs cytokinesis and prevents accumulation of activated RhoA at the division furrow. Endogenous xMELK associates and co-localizes with the cytokinesis organizer anillin.","method":"Xenopus embryo knockdown (xMELK morpholino), live imaging of xMELK localization, RhoA activation assay at furrow, xMELK overexpression, co-immunoprecipitation with anillin","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function phenotype (cytokinesis failure), localization by live imaging, Co-IP with anillin, RhoA mechanistic link; multiple orthogonal methods","pmids":["21378312"],"is_preprint":false},{"year":2012,"finding":"The C. elegans MELK ortholog PIG-1 acts in the same genetic pathway as PAR-4/LKB1 and its partners STRD-1 and MOP-25.2 to promote asymmetric Q neuroblast division. A conserved threonine in the PIG-1 activation loop (T169), equivalent to the AMPK family phosphorylation site, is essential for PIG-1 activity, consistent with PAR-4 (LKB1) phosphorylating and activating PIG-1. PIG-1 localizes to centrosomes during Q-cell divisions independently of T169 or PAR-4.","method":"C. elegans genetic epistasis (double mutants par-4/pig-1, strd-1/pig-1), activation-loop mutagenesis (T169A), centrosome localization by imaging","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic epistasis with activation-loop mutagenesis and localization analysis; establishes PAR-4/LKB1 as upstream activator of PIG-1/MELK","pmids":["23267054"],"is_preprint":false},{"year":2013,"finding":"MELK forms a protein complex with the transcription factor FOXM1 in glioma stem cells (GSCs). MELK phosphorylates and activates FOXM1 in a kinase-dependent manner, leading to upregulation of mitotic regulatory genes. This MELK-dependent FOXM1 activation is further modulated by PLK1, which trans-phosphorylates FOXM1 in the complex.","method":"Co-immunoprecipitation (MELK-FOXM1 complex), in vitro kinase assay (FOXM1 phosphorylation), siRNA knockdown, neurosphere formation, luciferase reporter for FOXM1 target genes","journal":"Stem cells (Dayton, Ohio)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP, in vitro kinase assay, kinase-dependence validation, multiple orthogonal approaches; replicated across labs","pmids":["23404835"],"is_preprint":false},{"year":2013,"finding":"MELK is regulated by JNK signaling and forms a complex with the oncoprotein c-JUN specifically in GSCs but not in normal neural progenitors. MELK silencing induces p53 expression, while p53 inhibition induces MELK expression, indicating mutual exclusivity. MELK silencing-mediated GSC apoptosis is partially rescued by both pharmacological p53 inhibition and p53 gene silencing, indicating MELK action is p53-dependent.","method":"Co-immunoprecipitation (MELK-c-JUN), shRNA-mediated MELK knockdown, pharmacological p53 inhibition, p53 siRNA, in vivo intracranial tumor model","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and epistasis by genetic/pharmacological rescue; single lab, multiple methods","pmids":["23339114"],"is_preprint":false},{"year":2013,"finding":"Crystal structures of MELK in complex with AMP-PNP and with nanomolar inhibitors were determined, providing structural characterization of the MELK active site, insight into the role of the UBA domain, and identification of key residues for achieving high binding potency.","method":"X-ray crystallography of MELK-AMP-PNP and MELK-inhibitor co-crystal structures","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — first crystal structures of MELK with ligands, structural characterization of active site and UBA domain; single lab","pmids":["23914841"],"is_preprint":false},{"year":2013,"finding":"Loss of MELK in U87 MG glioblastoma cells causes G1/S cell cycle arrest accompanied by cell death or senescence, mediated by increased p21(WAF1/CIP1) expression. This p21 induction results from consecutive activation of ATM, Chk2, and p53. The p53 activation in MELK-deficient cells is not due to increased p53 stability but to loss of MDMX (an inhibitor of p53 transactivation). MELK loss leads to accumulation of DNA double-strand breaks during replication, stalled replication forks, and reduced fork progression speed.","method":"siRNA-mediated MELK knockdown with siRNA-resistant MELK rescue, γH2AX foci analysis, DNA fiber assay (replication fork speed), immunoblotting for ATM/Chk2/p53/MDMX, flow cytometry for cell cycle","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO/rescue experiment with multiple orthogonal mechanistic readouts (ATM/Chk2/p53 pathway, DNA fiber analysis, MDMX); single lab but rigorous","pmids":["23836907"],"is_preprint":false},{"year":2013,"finding":"RACK1 (Receptor for Activated protein Kinase C) was identified as a partner of Xenopus MELK (xMELK). RACK1 co-localizes with xMELK at tight junctions in epithelial cells. A truncated RACK1 construct interferes with xMELK localization at cell-cell contacts. Cell-cycle-dependent localization of xMELK differs between epithelial (enriched at apical junctional complex) and mesenchyme-like cells (uniform cortical distribution).","method":"Co-immunoprecipitation (xMELK-RACK1), immunofluorescence colocalization, dominant-negative RACK1 construct, live cell imaging","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and localization with functional interference via truncated RACK1; single lab","pmids":["24167714"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of MPK38/MELK (T167E active mutant) in complex with OTSSP167 was determined, showing the detailed protein-inhibitor interactions and confirming that OTSSP167 fits into the MELK active site.","method":"X-ray crystallography of MPK38-OTSSP167 co-crystal","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure determination; single lab but direct structural method","pmids":["24657156"],"is_preprint":false},{"year":2014,"finding":"MELK is identified as an oncogenic kinase from an in vivo tumorigenesis screen. In basal-like breast cancer (BBC) cells, MELK ablation selectively impairs proliferation (in vitro and in vivo), induces caspase-dependent cell death preceded by defective mitosis. MELK overexpression in BBC is largely dependent on FoxM1 transcriptional regulation. Melk knockout mice are viable and develop normally, indicating MELK is not required for normal development.","method":"Kinome-wide ORF in vivo tumorigenesis screen, shRNA knockdown, CRISPR-independent KO mouse, caspase assay, mitosis imaging, xenograft","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo screen, KO mouse validation, multiple orthogonal cellular assays including caspase and mitosis analysis; single lab but rigorous","pmids":["24844244"],"is_preprint":false},{"year":2015,"finding":"EZH2 is a target of the MELK-FOXM1 complex in GSCs. MELK or FOXM1 promotes GSC radioresistance through regulation of EZH2 expression. The MELK-EZH2 signaling axis is conserved in C. elegans.","method":"Gain- and loss-of-function studies (shRNA, overexpression), co-expression analysis in GBM, C. elegans genetic analysis","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined radioresistance readout; evolutionary conservation; single lab","pmids":["25601206"],"is_preprint":false},{"year":2015,"finding":"MELK-T1 (a selective MELK inhibitor) triggers rapid, proteasome-dependent degradation of MELK protein. MELK-T1 treatment induces accumulation of stalled replication forks and DNA double-strand breaks, culminating in replicative senescence, ATM activation, CHK2 phosphorylation, p53 phosphorylation, p21 upregulation, and FOXM1 target gene down-regulation in MCF-7 breast cancer cells.","method":"Pharmacological inhibition with MELK-T1, proteasome inhibitor rescue, γH2AX foci, immunoblotting for ATM/CHK2/p53/p21/FOXM1","journal":"Bioscience reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with multiple pathway readouts and proteasome-inhibitor rescue; single lab","pmids":["26431963"],"is_preprint":false},{"year":2016,"finding":"MELK phosphorylates eIF4B at Ser406 during mitosis. MELK and eIF4B form a complex during mitosis (identified by immunoprecipitation/mass spectrometry). The MELK-eIF4B axis regulates protein synthesis during mitosis; specifically, synthesis of the anti-apoptotic protein MCL1 depends on MELK-eIF4B function. Inactivation of MELK or eIF4B reduces MCL1 protein synthesis and induces apoptotic cancer cell death.","method":"Immunoprecipitation/mass spectrometry, peptide library substrate profiling, in vitro kinase assay (eIF4B Ser406 phosphorylation), protein synthesis assay, apoptosis assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — substrate identified by IP/MS, in vitro kinase assay confirms phosphorylation, functional consequence (MCL1 synthesis, apoptosis) established; multiple orthogonal methods","pmids":["27528663"],"is_preprint":false},{"year":2016,"finding":"MELK kinase inhibition (by MELK-T1, OTS167, and siRNA knockdown) induces p21 protein expression in p53-deficient cancer cells. FOXO1 and FOXO3 are phosphorylated by MELK and are involved in p21 induction after MELK inhibition, indicating a p53-independent mechanism of p21 regulation by MELK.","method":"siRNA knockdown of MELK in p53-deficient cell lines, pharmacological inhibition (OTS167), immunoblotting for p21/FOXO1/FOXO3 phosphorylation, flow cytometry cell cycle analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined pathway (FOXO1/3 phosphorylation) in p53-null context; single lab","pmids":["28938528"],"is_preprint":false},{"year":2017,"finding":"MELK phosphorylates Ser-149 of the HIV-1 capsid protein in the multimerized HIV-1 core, triggering uncoating to promote viral cDNA synthesis. Depletion of MELK inhibits HIV-1 cDNA synthesis with a concomitant delay of capsid disassembly. A phosphorylation-mimetic HIV-1 capsid mutant (S149E) undergoes premature capsid disassembly and earlier cDNA synthesis, but fails to enter the nucleus.","method":"Genetic screening of T-cells, MELK depletion (siRNA), in vitro kinase assay (capsid phosphorylation at Ser-149), phospho-mimetic capsid mutant, capsid uncoating assay, HIV-1 cDNA synthesis assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with specific substrate (capsid Ser-149), phospho-mimetic mutant validation, functional consequence (premature uncoating/cDNA synthesis); multiple orthogonal methods","pmids":["28683086"],"is_preprint":false},{"year":2017,"finding":"MELK promotes melanoma growth by activating the NF-κB pathway via Sequestosome 1 (SQSTM1/p62). MELK is transcriptionally upregulated by the MAPK pathway through transcription factor E2F1 in melanoma cells. SILAC phosphoproteomics after MELK inhibition identified 469 proteins with reduced phosphorylation, 139 of which are known BRAF/MEK substrates, positioning MELK as a downstream mediator of the MAPK pathway.","method":"SILAC phosphoproteomics, shRNA knockdown, pharmacological inhibition, NF-κB reporter assay, E2F1 ChIP and promoter analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SILAC phosphoproteomics plus NF-κB/E2F1 functional assays; single lab, multiple orthogonal methods","pmids":["29212029"],"is_preprint":false},{"year":2017,"finding":"Wild-type p53 suppresses MELK expression by repressing FOXM1 transcription indirectly through reduction of E2F1 binding to the FOXM1 promoter (shown by ChIP assay). Promoter deletion studies identified a FOXM1-binding site in the MELK promoter as the p53-responsive region. Loss of wild-type p53 (by mutation) in TNBC induces MELK expression via derepression of FOXM1.","method":"Promoter deletion studies, site-directed mutagenesis, ChIP assay (E2F1 at FOXM1 promoter, FOXM1 at MELK promoter), p53 gain- and loss-of-function, western blotting","journal":"NPJ breast cancer","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP assay plus promoter deletion/mutagenesis; single lab, multiple methods identifying the p53-E2F1-FOXM1-MELK regulatory cascade","pmids":["31909186"],"is_preprint":false},{"year":2017,"finding":"In basal-like breast cancer cells, genetic deletion or acute pharmacological depletion of MELK (using CRISPR/Cas9 KO, selective inhibitor HTH-01-091, chemical-induced protein degradation, shRNA, or CRISPRi) does NOT significantly affect cellular growth under common culture conditions. This contradicts previous RNAi-based findings and reveals that widely-used OTSSP167 has poor selectivity for MELK, and that prior MELK-targeting shRNAs have off-target effects.","method":"CRISPR/Cas9 knockout, novel selective MELK inhibitor (HTH-01-091), chemical-induced protein degradation, RNA interference, CRISPR interference","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — five independent genetic/chemical perturbation approaches; rigorous negative result replicated with multiple orthogonal tools","pmids":["28926338"],"is_preprint":false},{"year":2017,"finding":"MELK bound to EZH2 and phosphorylated EZH2 at S220 in medulloblastoma stem-like cells. This phosphorylation was concomitant with loss of EZH2 K222 ubiquitination, suggesting phosphorylation-dependent protection from ubiquitination. In turn, EZH2 mediates methylation of MELK, creating a cooperative regulatory loop.","method":"Co-immunoprecipitation (MELK-EZH2), quantitative mass spectrometry analysis of phosphorylation and ubiquitination sites, loss-of-function studies (shRNA/inhibitors), xenograft models","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mass spectrometry-based PTM mapping; single lab","pmids":["28536141"],"is_preprint":false},{"year":2019,"finding":"MELK phosphorylates EZH2 at S220, preventing K222 ubiquitination and thereby stabilizing EZH2. Quantitative MS confirmed the MELK-dependent increase in EZH2 S220 phosphorylation and concomitant decrease in K222 ubiquitination. MELK inhibition (chemical and genetic) leads to EZH2 ubiquitination and proteasomal degradation. USP36 was identified as the deubiquitinase that removes ubiquitin from EZH2 K222. FOXM1 is not involved in MELK-mediated EZH2 stability in NKTL (unlike in glioma).","method":"Quantitative mass spectrometry (phospho- and ubiquitin-site mapping), chemical and genetic MELK inhibition, ubiquitination assay, USP36 identification, tissue microarray","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — quantitative MS for PTM mapping, chemical + genetic inhibition, USP36 identified as deubiquitinase; multiple orthogonal methods","pmids":["31434700"],"is_preprint":false},{"year":2019,"finding":"MELK phosphorylates PRAS40 (an inhibitory subunit of mTORC1), disrupting the interaction between PRAS40 and raptor, thereby over-activating mTORC1 signaling in clear cell renal cell carcinoma.","method":"Loss- and gain-of-function assays (siRNA, overexpression), co-immunoprecipitation (PRAS40-raptor interaction), phosphorylation analysis, mTORC1 pathway readouts","journal":"Cell transplantation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP showing PRAS40-raptor disruption, phosphorylation analysis; single lab","pmids":["31813279"],"is_preprint":false},{"year":2019,"finding":"MELK interacts with p21 through the CDK-binding region of p21 and the C-terminal domain of MELK. MELK phosphorylates p21 at Thr55, stimulating p21 nuclear translocation, CDK2-p21 and CDK4-p21 complex formation, and inhibition of CDK2-cyclin E and CDK4-cyclin D assembly. p21 phosphorylation by MELK at Thr55 reduces PPARγ transactivation required for adipogenesis. Restoration of p21 by adenoviral delivery in diet-induced obese mice ameliorates metabolic abnormalities in a MELK phosphorylation-dependent manner.","method":"Co-immunoprecipitation, in vitro kinase assay (p21 Thr55 phosphorylation), nuclear translocation assay, CDK complex formation assay, adenoviral delivery in mice, CRISPR knockin validation","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with specific phosphosite, in vivo rescue in mice, CDK complex analysis, multiple orthogonal methods","pmids":["31097688"],"is_preprint":false},{"year":2018,"finding":"MELK expression correlates with tumor mitotic activity across cancer types. Multiple MELK-null CRISPR/Cas9 clones across cancer types proliferate at wild-type levels in vitro, under environmental stress, in the presence of cytotoxic chemotherapies, and in vivo. Combination of MELK-KO clones with a highly specific MELK inhibitor (HTH-01-091) shows no specific anti-proliferative phenotype, indicating that acute MELK inhibition is not sufficient for anti-tumor activity as a monotherapy.","method":"CRISPR/Cas9 knockout (multiple clones across cancer types), specific MELK inhibitor HTH-01-091, in vitro proliferation assays, xenograft in vivo studies, gene expression correlation analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple CRISPR KO clones across cancer types combined with selective inhibitor, in vitro and in vivo; replicated negative finding with rigorous controls","pmids":["29417930"],"is_preprint":false},{"year":2018,"finding":"SANGUINARINE disrupts the association between STRAP and MELK in colorectal cancer cells by dephosphorylating both proteins, triggering intrinsic (Bax-dependent) apoptosis. The STRAP-MELK interaction is observed in Bax-positive cells but not Bax-negative cells. MELK kinase activity was measured in vitro.","method":"Co-immunoprecipitation (STRAP-MELK), immunofluorescence colocalization, in vitro kinase activity assay, flow cytometry apoptosis analysis","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and in vitro kinase assay, functional link to apoptosis; single lab","pmids":["29783958"],"is_preprint":false},{"year":2018,"finding":"MELK inhibition (NVS-MELK8a, a highly selective MELK inhibitor) delays mitotic entry in triple-negative breast cancer cells, manifesting as lengthened G2 phase (confirmed by live-cell microscopy with fluorescent PCNA). This G2 delay is associated with delayed activation of Aurora A, Aurora B, and CDK1. After this delay, cells enter and complete mitosis, with impaired growth due to cell cycle perturbation rather than apoptosis induction.","method":"MIB/MS selectivity profiling, resazurin/crystal violet proliferation assays, double-thymidine synchronization, immunoblotting, live-cell microscopy with fluorescent PCNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — selective inhibitor validated by MIB/MS, live-cell microscopy confirming G2 delay, Aurora/CDK1 activation analysis; multiple orthogonal methods","pmids":["31896573"],"is_preprint":false},{"year":2017,"finding":"Smad proteins regulate MPK38/MELK kinase activity in an opposing manner: Smad2/3/4 increase MPK38-mediated ASK1/TGF-β/p53 signaling and stabilize MPK38, while Smad7 decreases MPK38 activity and stability. Smads2/3/4 attenuate the interaction between MPK38 and its negative regulator thioredoxin (Trx), and enhance the interaction with its positive regulator ZPR9. MPK38 phosphorylates Smad2 at S245, Smad3 at S204, Smad4 at S343, and Smad7 at T96; phosphorylation-defective Smad mutants lose the ability to regulate MPK38.","method":"Co-immunoprecipitation, in vitro kinase assay (MPK38 phosphorylation of Smads at specific residues), phosphorylation-defective Smad mutants, adenoviral overexpression in HFD-fed obese mice, metabolic phenotyping","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, Co-IP, in vivo adenoviral rescue; single lab with multiple methods","pmids":["29700281"],"is_preprint":false},{"year":2017,"finding":"ZPR9 (zinc finger protein) is an activator of MPK38/MELK. The association of MPK38 and ZPR9 is mediated by specific cysteine residues (Cys269/Cys286 of MPK38, Cys305/Cys308 of ZPR9). MPK38 phosphorylates ZPR9 at Thr252; phosphorylation at Thr252 is required for ZPR9 to enhance MPK38-mediated ASK1, TGF-β, and p53 signaling and stabilize MPK38. ZPR9 competes with the negative regulator thioredoxin (Trx) for MPK38 binding.","method":"Co-immunoprecipitation, in vitro kinase assay (ZPR9 Thr252 phosphorylation), cysteine and Thr252 mutants, CRISPR/Cas9 knockin (T252A), conditional knockdown, HFD mouse model","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with specific site, CRISPR knockin validation, multiple mutant analyses; single lab but rigorous","pmids":["28195154"],"is_preprint":false},{"year":2020,"finding":"MELK interacts with STAT3 (by co-immunoprecipitation) and induces STAT3 phosphorylation, leading to increased expression of its target gene CCL2 in HCC. This CCL2 upregulation promotes M2 macrophage polarization and impairs CD8+ T-cell recruitment, contributing to immunosuppression. MELK is also regulated upstream by miR-505-3p.","method":"IP-MS and Co-IP (MELK-STAT3 interaction), luciferase assays, RNA sequencing, murine xenograft and lung metastasis models, macrophage polarization assay","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and IP-MS confirming MELK-STAT3 interaction with downstream functional readout (CCL2, macrophage polarization); single lab","pmids":["38970074"],"is_preprint":false},{"year":2020,"finding":"In C. elegans, PIG-1/MELK is required for partitioning of CES-1 Snail (anti-apoptotic factor) during asymmetric NSM neuroblast division. PIG-1/MELK acts through phosphorylation and cortical enrichment of nonmuscle myosin II prior to neuroblast division, promoting actomyosin contractility that drives apoptotic fate through CES-1 Snail asymmetric partitioning. pig-1/MELK is controlled by both a ces-1 Snail- and par-4/LKB1-dependent pathway.","method":"C. elegans genetics (pig-1 mutants, epistasis with ces-1 and par-4), imaging of nonmuscle myosin II cortical localization, CES-1 Snail partitioning analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with imaging of myosin cortical localization; establishes PIG-1/MELK → myosin II → CES-1 partitioning pathway; single lab","pmids":["32946434"],"is_preprint":false},{"year":2019,"finding":"MELK has a direct interaction with MLST8 (a component of both mTORC1 and mTORC2) in endometrial carcinoma cells, demonstrated by co-immunoprecipitation. This interaction activates both mTORC1 and mTORC2 signaling pathways to promote EC progression. MELK expression is transcriptionally regulated by E2F1 (confirmed by ChIP and luciferase assay).","method":"Co-immunoprecipitation (MELK-MLST8), chromatin immunoprecipitation (E2F1 at MELK promoter), luciferase reporter assay, knockdown/overexpression studies, xenograft","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with MLST8, ChIP for upstream E2F1 regulation, functional mTOR pathway readout; single lab","pmids":["31915116"],"is_preprint":false},{"year":2018,"finding":"MELK inhibition in DIPG cells functions through reducing inhibitory phosphorylation of PPARγ, resulting in increased nuclear translocation and transcriptional activity of PPARγ (MELK-PPARγ signaling axis identified by RNA sequencing of inhibitor-treated cells).","method":"MELK inhibitor (OTSSP167) treatment, RNA sequencing of treated DIPG cells, PPARγ phosphorylation and nuclear translocation analysis, xenograft model","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA sequencing plus PPARγ phosphorylation/nuclear translocation analysis after MELK inhibition; single lab","pmids":["30061363"],"is_preprint":false},{"year":2023,"finding":"MELK activates the PI3K/mTOR signaling pathway and promotes DLAT (Dihydrolipoamide S-Acetyltransferase) expression, stabilizing mitochondrial function, improving mitochondrial respiration, reducing intracellular ROS, and promoting resistance to elesclomol-induced cuproptosis in HCC.","method":"MELK knockdown/overexpression, PI3K/mTOR pathway inhibition, DLAT expression analysis, mitochondrial function assays, elesclomol resistance assay, TOM20 and DLAT oligomer analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss/gain-of-function with PI3K/mTOR readouts and mitochondrial functional assays; single lab","pmids":["37949877"],"is_preprint":false},{"year":2018,"finding":"In cancer cells with conditional MELK dependency, abrogation of MELK expression has little effect under high-density common culture conditions but MELK dependency becomes apparent in clonogenic growth assays with both RNAi and CRISPR technologies. This conditional dependency pattern resembles oncogenes (MYC, KRAS) rather than essential genes (classic mitotic kinases).","method":"RNAi and CRISPR-mediated MELK depletion under varying cell density conditions, clonogenic assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic comparison of culture conditions with both genetic tools; single lab but addresses important context-dependence","pmids":["30391850"],"is_preprint":false},{"year":2025,"finding":"MELK binds to FABP5 (fatty acid-binding protein 5) and affects its ubiquitination through the K48R pathway (K48-linked ubiquitin) to increase FABP5 stability, thereby activating the Akt/mTOR signaling axis and suppressing RFA-mediated immunogenic cell death in HCC.","method":"Co-immunoprecipitation (MELK-FABP5), ubiquitination assay (K48R pathway), Akt/mTOR pathway analysis, RFA tumor model, nanoparticle delivery (RGD-LNPs)","journal":"Military Medical Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with FABP5, ubiquitination pathway analysis, Akt/mTOR readout; single lab","pmids":["39871325"],"is_preprint":false}],"current_model":"MELK is a Snf1/AMPK-family serine/threonine kinase that is activated during mitosis through phosphorylation by MPF (CDK1/cyclin B) and MAPK at specific T-loop and C-terminal residues; its minimal active unit comprises the N-terminal catalytic domain plus the flanking UBA domain, while a C-terminal fragment acts as an autoinhibitory domain. MELK promotes cell proliferation and cancer stem cell survival through multiple mechanisms: it phosphorylates and activates FOXM1 (in cooperation with PLK1), phosphorylates and stabilizes EZH2 (blocking K222 ubiquitination by competiting with USP36), phosphorylates eIF4B at Ser406 to sustain mitotic protein synthesis (including MCL1), suppresses the pro-apoptotic function of Bcl-GL, interacts with STAT3 to drive CCL2 expression and immunosuppression, and phosphorylates PRAS40 to hyperactivate mTORC1. MELK also inhibits pre-mRNA splicing by recruiting NIPP1 via phospho-Thr478, localizes to the equatorial cortex during cytokinesis where it interacts with anillin and regulates RhoA, and in C. elegans its ortholog PIG-1 drives asymmetric neuroblast division through phosphorylation of nonmuscle myosin II downstream of the LKB1/PAR-4 pathway. MELK transcription is directly controlled by E2F family members and indirectly suppressed by wild-type p53 through E2F1-FOXM1. Despite this extensive mechanistic literature, genetic CRISPR deletion of MELK in cancer cells under standard conditions does not impair proliferation, revealing a context-dependent requirement and raising questions about the selectivity of widely used inhibitors such as OTSSP167."},"narrative":{"mechanistic_narrative":"MELK is a Snf1/AMPK-family serine/threonine kinase that couples mitotic cell-cycle progression to the survival and self-renewal programs of proliferating and cancer stem cells [PMID:9136115, PMID:24844244]. Its catalytic core comprises the N-terminal kinase domain plus the flanking UBA domain as the minimal active unit, with a C-terminal autoinhibitory region; activity depends on activation-loop autophosphorylation (Thr167/Ser171), reducing conditions, and is inhibited by Ca2+ [PMID:16216881]. MELK is activated specifically during M-phase through direct phosphorylation by MPF (CDK1/cyclin B) and MAPK on T-loop and C-terminal residues, explaining its mitotic timing [PMID:16628004], and in the C. elegans ortholog PIG-1 the activation-loop threonine is supplied by the upstream PAR-4/LKB1 kinase to drive asymmetric neuroblast division via cortical nonmuscle myosin II [PMID:23267054, PMID:32946434]. Once active, MELK phosphorylates a broad substrate set to sustain proliferation and block apoptosis: it forms a complex with FOXM1 and phosphorylates it (with PLK1) to drive mitotic gene expression [PMID:23404835], phosphorylates and stabilizes EZH2 at Ser220 by blocking K222 ubiquitination in competition with USP36 [PMID:31434700], phosphorylates eIF4B at Ser406 to maintain mitotic synthesis of the anti-apoptotic protein MCL1 [PMID:27528663], and suppresses Bcl-GL-induced apoptosis in a kinase-dependent manner [PMID:17280616]. MELK additionally feeds into mTOR signaling through PRAS40 and MLST8 [PMID:31813279, PMID:31915116], engages STAT3 to drive CCL2-dependent immunosuppression [PMID:38970074], and through an FHA-domain interaction with NIPP1 dependent on phospho-Thr478 inhibits an early step of spliceosome assembly independently of its catalytic activity [PMID:14699119]. MELK transcription is a direct E2F target and is derepressed when wild-type p53 is lost, via the p53–E2F1–FOXM1 axis [PMID:16144839, PMID:31909186]. Despite this extensive substrate literature, CRISPR deletion and acute selective inhibition of MELK across multiple cancer cell types do not impair proliferation under standard conditions, demonstrating a conditional, context-dependent requirement and exposing the poor selectivity of widely used inhibitors such as OTSSP167 [PMID:28926338, PMID:29417930, PMID:30391850].","teleology":[{"year":1997,"claim":"Established MELK's molecular identity, placing an uncharacterized maternal transcript into the Snf1/AMPK kinase family and predicting serine/threonine kinase activity.","evidence":"Differential display cloning and sequence analysis of the kinase domain and leucine zipper in mouse eggs/embryos","pmids":["9136115"],"confidence":"Medium","gaps":["No functional reconstitution of kinase activity","No substrates or pathway identified"]},{"year":2003,"claim":"Revealed a kinase-independent function: MELK inhibits spliceosome assembly by docking onto NIPP1, showing that a phosphosite (Thr478) rather than catalysis mediates this activity.","evidence":"FHA-domain binding assays, in vitro spliceosome assembly in nuclear extracts, kinase-dead and T478A mutants","pmids":["14699119"],"confidence":"High","gaps":["Physiological splicing targets in cells not defined","Link between mitotic NIPP1-MELK binding and cell-cycle splicing control unresolved"]},{"year":2005,"claim":"Defined the enzymatic and regulatory architecture of MELK, including activation-loop autophosphorylation, the minimal active kinase-UBA unit, C-terminal autoinhibition, and redox/Ca2+ control.","evidence":"In vitro kinase assays, autophosphorylation site mapping, domain deletion constructs, Ca2+-binding and mutagenesis","pmids":["16216881"],"confidence":"High","gaps":["Broad substrate specificity leaves physiological substrates undefined","Mechanism of Ca2+ inhibition in vivo unclear"]},{"year":2005,"claim":"Connected MELK to proliferation control by placing its transcription under E2F and pocket-protein regulation and tying it to neural progenitor self-renewal via B-myb.","evidence":"E2F promoter mutagenesis and pocket-protein knockout comparisons; siRNA/overexpression and neurosphere assays in neural progenitors","pmids":["16144839","16061694"],"confidence":"Medium","gaps":["Direct MELK substrates driving self-renewal not identified","Relationship between transcriptional control and kinase function unresolved"]},{"year":2006,"claim":"Explained why MELK acts in mitosis by identifying MPF and MAPK as direct upstream activating kinases that phosphorylate MELK at M-phase-specific sites.","evidence":"M-phase Xenopus egg extract phosphosite mapping by MS plus in vitro kinase assays with recombinant MPF/MAPK","pmids":["16628004"],"confidence":"High","gaps":["Functional consequence of each phosphosite not dissected","How activation couples to downstream substrates not addressed"]},{"year":2006,"claim":"Showed the MELK ortholog PIG-1 controls cell polarity and asymmetric division, not just cell cycle, transforming an apoptotic daughter into a neuron when lost.","evidence":"C. elegans pig-1 loss-of-function with cell-size and fate analysis","pmids":["16774992"],"confidence":"Medium","gaps":["Molecular substrate driving asymmetry unknown at this stage","Upstream activator not yet defined"]},{"year":2007,"claim":"Provided the first anti-apoptotic substrate link, showing MELK binds and phosphorylates Bcl-GL and suppresses Bcl-GL-induced death in a kinase-dependent manner.","evidence":"Pull-downs, immunocomplex kinase assay, kinase-dead (D150A) rescue, TUNEL/FACS apoptosis assays","pmids":["17280616"],"confidence":"High","gaps":["Phosphosite on Bcl-GL not mapped","In vivo relevance to tumor survival not tested here"]},{"year":2011,"claim":"Defined a cytokinetic role: MELK accumulates at the equatorial cortex, associates with anillin, and is required for RhoA-dependent furrowing.","evidence":"Xenopus embryo morpholino knockdown, live imaging, RhoA activation assay, Co-IP with anillin","pmids":["21378312"],"confidence":"High","gaps":["Cytokinetic substrate of MELK not identified","Mechanism of cortical recruitment unknown"]},{"year":2012,"claim":"Identified PAR-4/LKB1 as the upstream activating kinase of PIG-1/MELK via the conserved activation-loop threonine, defining the kinase cascade controlling asymmetric division.","evidence":"C. elegans genetic epistasis (par-4, strd-1, mop-25.2), T169A activation-loop mutagenesis, centrosome localization imaging","pmids":["23267054"],"confidence":"High","gaps":["Whether LKB1 directly phosphorylates mammalian MELK not shown","Centrosomal function of PIG-1 not mechanistically defined"]},{"year":2013,"claim":"Established MELK as a driver of cancer stem cell programs by showing it complexes with and phosphorylates FOXM1 (with PLK1) and feeds into c-JUN/p53-dependent survival in glioma stem cells.","evidence":"Co-IP, in vitro kinase assays, shRNA, luciferase reporters, intracranial tumor models","pmids":["23404835","23339114"],"confidence":"High","gaps":["FOXM1 phosphosite(s) by MELK not fully mapped","Distinction between transcriptional autoregulation and direct phosphorylation incomplete"]},{"year":2013,"claim":"Linked MELK loss to genome stability, showing depletion causes replication-fork stalling, DNA breaks, and ATM-Chk2-p53-p21 arrest via MDMX loss.","evidence":"siRNA with rescue, gammaH2AX foci, DNA fiber assays, ATM/Chk2/p53/MDMX immunoblotting, cell-cycle flow cytometry","pmids":["23836907"],"confidence":"High","gaps":["Direct MELK substrate at replication forks not identified","Later genetic studies question generality of this proliferation requirement"]},{"year":2013,"claim":"Provided structural definition of the MELK active site and UBA domain and the basis for nanomolar inhibitor binding.","evidence":"X-ray crystallography of MELK with AMP-PNP and inhibitors","pmids":["23914841"],"confidence":"High","gaps":["No structure of full-length autoinhibited enzyme","Conformational basis of activation not captured"]},{"year":2014,"claim":"Validated MELK as an oncogenic kinase in basal-like breast cancer while showing it is dispensable for normal development, foreshadowing context-dependence.","evidence":"In vivo kinome ORF tumorigenesis screen, shRNA, KO mouse, caspase and mitosis assays, xenografts; OTSSP167 co-crystal","pmids":["24844244","24657156"],"confidence":"High","gaps":["RNAi-based dependency later challenged by CRISPR studies","OTSSP167 selectivity not yet questioned at this point"]},{"year":2016,"claim":"Identified eIF4B-Ser406 as a MELK substrate that sustains mitotic translation of MCL1, providing a direct molecular route from MELK to apoptosis resistance.","evidence":"IP/MS, peptide-library substrate profiling, in vitro kinase assay, protein synthesis and apoptosis assays","pmids":["27528663"],"confidence":"High","gaps":["Other mitotic translation targets not enumerated","Contribution relative to other MELK survival pathways unquantified"]},{"year":2017,"claim":"Demonstrated MELK stabilizes EZH2 by phosphorylating Ser220 to block K222 ubiquitination, with USP36 identified as the relevant deubiquitinase, linking MELK to epigenetic silencing.","evidence":"Co-IP, quantitative MS for phospho/ubiquitin sites, chemical and genetic MELK inhibition, ubiquitination assays","pmids":["28536141","31434700"],"confidence":"High","gaps":["Context-specificity (FOXM1-dependent vs independent) across tumor types unresolved","Cooperative EZH2-mediated MELK methylation loop incompletely defined"]},{"year":2017,"claim":"Defined MELK's redox-coupled regulatory network and TGF-beta/p53 substrate set, showing ZPR9 and Smad2/3/4 activate and stabilize MELK while thioredoxin and Smad7 inhibit it.","evidence":"Co-IP, in vitro kinase assays with phosphosite mutants, CRISPR knockin, adenoviral rescue in obese mice","pmids":["28195154","29700281"],"confidence":"High","gaps":["Integration of metabolic and mitotic MELK functions unclear","In vivo significance of Smad phosphosites in cancer not established"]},{"year":2017,"claim":"Broadened MELK function beyond proliferation by showing it phosphorylates HIV-1 capsid Ser149 to trigger uncoating required for viral cDNA synthesis.","evidence":"T-cell genetic screen, siRNA depletion, in vitro capsid kinase assay, phospho-mimetic S149E mutant, uncoating/cDNA assays","pmids":["28683086"],"confidence":"High","gaps":["Relevance to MELK's endogenous cellular role unclear","Spatiotemporal control of capsid phosphorylation undefined"]},{"year":2017,"claim":"Overturned the prevailing dependency model by showing CRISPR deletion, degradation, and a selective inhibitor (HTH-01-091) leave basal-like breast cancer growth intact, exposing OTSSP167 off-target effects.","evidence":"Five orthogonal perturbations (CRISPR KO, HTH-01-091, chemical degradation, RNAi, CRISPRi)","pmids":["28926338"],"confidence":"High","gaps":["Conditions under which MELK becomes required not yet defined here","Reconciliation with prior in vivo screen results incomplete"]},{"year":2018,"claim":"Generalized the negative result across cancer types and reframed MELK dependency as conditional, oncogene-like and density/clonogenic-context dependent rather than constitutively essential.","evidence":"Multiple CRISPR KO clones with HTH-01-091, in vitro/in vivo proliferation, clonogenic assays under varying density","pmids":["29417930","30391850"],"confidence":"High","gaps":["Molecular determinants of the conditional requirement unidentified","Predictive biomarkers for MELK dependency absent"]},{"year":2018,"claim":"Clarified the mitotic phenotype of acute MELK inhibition as a G2 delay with retarded Aurora/CDK1 activation rather than apoptosis, refining the kinase's cell-cycle role.","evidence":"Selective NVS-MELK8a inhibitor (MIB/MS validated), synchronization, live-cell PCNA microscopy, immunoblotting","pmids":["31896573"],"confidence":"High","gaps":["Direct MELK substrate controlling G2/M timing unknown","Reconciliation with non-essentiality across conditions incomplete"]},{"year":2019,"claim":"Expanded MELK substrates into mTOR and CDK-inhibitor signaling, showing phosphorylation of PRAS40, MLST8 engagement, and p21-Thr55 phosphorylation controlling cell-cycle and metabolic outputs.","evidence":"Co-IP, in vitro kinase assays with phosphosite mutants, CDK-complex assays, in vivo adenoviral rescue in obese mice, CRISPR knockin","pmids":["31813279","31915116","31097688"],"confidence":"High","gaps":["Hierarchy among multiple mTOR-activating mechanisms unresolved","Tissue-specific deployment of these substrates unclear"]},{"year":2020,"claim":"Linked MELK to tumor immune evasion via STAT3-driven CCL2 expression, M2 macrophage polarization, and suppressed CD8+ T-cell recruitment.","evidence":"IP-MS/Co-IP, luciferase assays, RNA-seq, xenograft and metastasis models, macrophage polarization assays","pmids":["38970074"],"confidence":"Medium","gaps":["STAT3 phosphosite by MELK not mapped","Single-lab finding without independent confirmation"]},{"year":2025,"claim":"Extended MELK function to metabolic and immunogenic-cell-death resistance through PI3K/Akt/mTOR activation, DLAT stabilization, and FABP5 ubiquitination control.","evidence":"Knockdown/overexpression, ubiquitination assays, mitochondrial function assays, Co-IP with FABP5, RFA tumor models","pmids":["37949877","39871325"],"confidence":"Medium","gaps":["Direct phosphorylation vs indirect stabilization of these targets unclear","Single-lab findings awaiting independent confirmation"]},{"year":null,"claim":"It remains unresolved which physiological substrate(s) and genetic/microenvironmental contexts render MELK functionally required, reconciling its rich kinase biology with its dispensability under standard culture.","evidence":"","pmids":[],"confidence":"High","gaps":["No defined biomarker predicting MELK dependency","The conditional requirement seen in clonogenic/stress contexts lacks a mechanistic explanation","Whether any single substrate (FOXM1, eIF4B, EZH2) is rate-limiting in vivo is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[7,10,19,21,26,27,28,32,33]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[2,6,19,28]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[2,12]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[27,36,38]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[8]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8,14]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,10]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,16,31,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[27,34,36]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[19,26,28]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[7,19]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,23,10]}],"complexes":[],"partners":["FOXM1","EZH2","NIPP1","EIF4B","STAT3","PRAS40","MLST8","ANILLIN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14680","full_name":"Maternal embryonic leucine zipper kinase","aliases":["Protein kinase Eg3","pEg3 kinase","Protein kinase PK38","hPK38","Tyrosine-protein kinase MELK"],"length_aa":651,"mass_kda":74.6,"function":"Serine/threonine-protein kinase involved in various processes such as cell cycle regulation, self-renewal of stem cells, apoptosis and splicing regulation. Has a broad substrate specificity; phosphorylates BCL2L14, CDC25B, MAP3K5/ASK1 and ZNF622. Acts as an activator of apoptosis by phosphorylating and activating MAP3K5/ASK1. Acts as a regulator of cell cycle, notably by mediating phosphorylation of CDC25B, promoting localization of CDC25B to the centrosome and the spindle poles during mitosis. Plays a key role in cell proliferation and carcinogenesis. Required for proliferation of embryonic and postnatal multipotent neural progenitors. Phosphorylates and inhibits BCL2L14, possibly leading to affect mammary carcinogenesis by mediating inhibition of the pro-apoptotic function of BCL2L14. Also involved in the inhibition of spliceosome assembly during mitosis by phosphorylating ZNF622, thereby contributing to its redirection to the nucleus. May also play a role in primitive hematopoiesis","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q14680/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MELK","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000165304","cell_line_id":"CID001220","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":1},{"compartment":"vesicles","grade":1}],"interactors":[{"gene":"FKBP5","stoichiometry":0.2},{"gene":"PSMG2","stoichiometry":0.2},{"gene":"PSMG4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001220","total_profiled":1310},"omim":[{"mim_id":"608694","title":"ZINC FINGER PROTEIN 622; ZNF622","url":"https://www.omim.org/entry/608694"},{"mim_id":"608130","title":"NUAK FAMILY, SNF1-LIKE KINASE, 1; NUAK1","url":"https://www.omim.org/entry/608130"},{"mim_id":"607025","title":"MATERNAL EMBRYONIC LEUCINE ZIPPER KINASE; MELK","url":"https://www.omim.org/entry/607025"},{"mim_id":"600540","title":"TRANSCRIPTION FACTOR Sp4; SP4","url":"https://www.omim.org/entry/600540"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":9.6},{"tissue":"lymphoid tissue","ntpm":19.6}],"url":"https://www.proteinatlas.org/search/MELK"},"hgnc":{"alias_symbol":["KIAA0175"],"prev_symbol":[]},"alphafold":{"accession":"Q14680","domains":[{"cath_id":"1.10.510.10","chopping":"3-89_294-327","consensus_level":"high","plddt":93.1398,"start":3,"end":327},{"cath_id":"1.10.510.10","chopping":"93-265","consensus_level":"high","plddt":90.0289,"start":93,"end":265},{"cath_id":"3.30.310.80","chopping":"556-649","consensus_level":"high","plddt":86.0788,"start":556,"end":649}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14680","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14680-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14680-F1-predicted_aligned_error_v6.png","plddt_mean":69.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MELK","jax_strain_url":"https://www.jax.org/strain/search?query=MELK"},"sequence":{"accession":"Q14680","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14680.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14680/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14680"}},"corpus_meta":[{"pmid":"23404835","id":"PMC_23404835","title":"MELK-dependent FOXM1 phosphorylation is essential for proliferation of glioma stem cells.","date":"2013","source":"Stem cells (Dayton, Ohio)","url":"https://pubmed.ncbi.nlm.nih.gov/23404835","citation_count":172,"is_preprint":false},{"pmid":"17280616","id":"PMC_17280616","title":"Involvement of maternal embryonic leucine zipper kinase (MELK) in mammary carcinogenesis through interaction with Bcl-G, a pro-apoptotic member of the Bcl-2 family.","date":"2007","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/17280616","citation_count":159,"is_preprint":false},{"pmid":"25601206","id":"PMC_25601206","title":"EZH2 protects glioma stem cells from radiation-induced cell death in a MELK/FOXM1-dependent manner.","date":"2015","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/25601206","citation_count":147,"is_preprint":false},{"pmid":"22945237","id":"PMC_22945237","title":"The maternal embryonic leucine zipper kinase (MELK) is upregulated in high-grade prostate cancer.","date":"2012","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/22945237","citation_count":134,"is_preprint":false},{"pmid":"23283305","id":"PMC_23283305","title":"Development of an orally-administrative MELK-targeting inhibitor that suppresses the growth of various types of human cancer.","date":"2012","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/23283305","citation_count":134,"is_preprint":false},{"pmid":"16061694","id":"PMC_16061694","title":"Maternal embryonic leucine zipper kinase (MELK) regulates multipotent neural progenitor proliferation.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/16061694","citation_count":131,"is_preprint":false},{"pmid":"9136115","id":"PMC_9136115","title":"New member of the Snf1/AMPK kinase family, Melk, is expressed in the mouse egg and preimplantation embryo.","date":"1997","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/9136115","citation_count":109,"is_preprint":false},{"pmid":"23339114","id":"PMC_23339114","title":"Tumor-specific activation of the C-JUN/MELK pathway regulates glioma stem cell growth in a p53-dependent manner.","date":"2013","source":"Stem cells (Dayton, Ohio)","url":"https://pubmed.ncbi.nlm.nih.gov/23339114","citation_count":100,"is_preprint":false},{"pmid":"25852826","id":"PMC_25852826","title":"MELK-a conserved kinase: functions, signaling, cancer, and controversy.","date":"2015","source":"Clinical and translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25852826","citation_count":99,"is_preprint":false},{"pmid":"24844244","id":"PMC_24844244","title":"MELK is an oncogenic kinase essential for mitotic progression in basal-like breast cancer 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psoriasis.","date":"2024","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/38382096","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49842,"output_tokens":11780,"usd":0.163113,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22681,"output_tokens":6894,"usd":0.142877,"stage2_stop_reason":"end_turn"},"total_usd":0.30599,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"MELK encodes a protein with a kinase catalytic domain and a leucine zipper motif, identifying it as a new member of the Snf1/AMPK family of serine/threonine kinases. It was initially identified as a maternal gene expressed in mouse eggs and preimplantation embryos.\",\n      \"method\": \"Differential display analysis of cDNA libraries; sequence analysis of kinase domain and leucine zipper motif\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequence-based classification confirmed by cloning and expression analysis in single study; no functional reconstitution\",\n      \"pmids\": [\"9136115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MELK interacts with NIPP1 (a spliceosome assembly factor) via the phosphothreonine-binding Forkhead-associated (FHA) domain of NIPP1, dependent on phosphorylation of Thr-478 of MELK. Recombinant MELK potently inhibits an early step of spliceosome assembly in nuclear extracts; a kinase-dead MELK mutant retains this inhibitory effect, but a T478A MELK mutant (which cannot bind NIPP1) does not, demonstrating that MELK inhibits splicing through NIPP1 binding rather than catalytic activity. The NIPP1-MELK interaction is increased in mitotically arrested cells.\",\n      \"method\": \"Protein interaction assay (FHA domain binding), in vitro spliceosome assembly assay in nuclear extracts, kinase-dead and T478A MELK mutants, mitotic cell lysates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of splicing inhibition with multiple mutants (kinase-dead vs. T478A), mechanistic dissection of NIPP1-dependent pathway\",\n      \"pmids\": [\"14699119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MELK has broad substrate specificity and does not require a specific phosphorylation-site consensus sequence. Autophosphorylation of Thr167 and Ser171 is required for MELK activation. MELK activity requires reducing agents (DTT or glutathione) and is inhibited by physiological Ca2+ concentrations, with MELK identified as a Ca2+-binding protein. The N-terminal catalytic domain plus the flanking ubiquitin-associated (UBA) domain constitutes the minimal catalytically active fragment. A C-terminal fragment functions as an autoinhibitory domain.\",\n      \"method\": \"In vitro kinase assays with recombinant MELK, autophosphorylation site mapping (16 sites identified), domain deletion constructs, Ca2+ binding assays, mutagenesis of Thr167/Ser171\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"16216881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MELK (Melk) expression in multipotent neural progenitors (MNPs) is cell cycle regulated. Overexpression of MELK enhances, while knockdown diminishes, neurosphere formation from MNPs, indicating a function in self-renewal. MELK down-regulation down-regulates B-myb expression, which independently mediates MNP proliferation.\",\n      \"method\": \"siRNA knockdown in MNP cultures, transgenic overexpression, neurosphere formation assay, B-myb expression analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with defined cellular readout (neurosphere formation), identification of downstream effector B-myb, single lab\",\n      \"pmids\": [\"16061694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MELK transcription is regulated by E2F transcription factors; Melk is a bona fide E2F target gene. Transfection studies and site-directed mutagenesis of E2F binding sites in the Melk promoter confirmed this. 1,25-dihydroxyvitamin D3 represses Melk expression through p107/p130 pocket proteins (but not pRb), consistent with E2F4-mediated repression.\",\n      \"method\": \"Promoter analysis, transfection assays, site-directed mutagenesis of E2F binding sites, p107/p130/pRb knockout cell comparisons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of promoter E2F sites plus genetic validation with pocket protein knockout cells; single lab\",\n      \"pmids\": [\"16144839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The C. elegans MELK ortholog PIG-1 regulates asymmetric neuroblast divisions: pig-1 mutants produce daughter cells of more equal size and the apoptotic daughter is transformed into its sister fate, generating extra neurons. PIG-1/MELK functions like other PAR-1 family members to regulate cell polarity rather than (only) cell cycle.\",\n      \"method\": \"C. elegans genetic loss-of-function (pig-1 mutants), cell size measurement, cell fate analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic loss-of-function with defined cell size and fate phenotypes in C. elegans ortholog; single lab\",\n      \"pmids\": [\"16774992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Xenopus MELK (xMELK) is phosphorylated during M-phase on residues T449, T451, and T481 (specifically detected during mitosis), in addition to T414 and S498. MPF (CDK1/cyclin B) and MAPK pathways are responsible for xMELK phosphorylation in vivo; MPF directly phosphorylates xMELK on T481 in vitro. Phosphorylation by MPF and MAPK enhances MELK kinase activity, explaining mitotic activation of MELK.\",\n      \"method\": \"Phosphorylation site mapping by mass spectrometry in M-phase Xenopus egg extract, in vitro kinase assays with recombinant MPF and MAPK, in vivo phosphorylation analysis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro direct phosphorylation by MPF/MAPK with site mapping, confirmed in vivo; multiple orthogonal methods\",\n      \"pmids\": [\"16628004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MELK physically interacts with Bcl-GL (long isoform of the pro-apoptotic Bcl-2 family member Bcl-G) via its amino-terminal region. MELK phosphorylates Bcl-GL in vitro (immunocomplex kinase assay). Overexpression of wild-type MELK suppresses Bcl-GL-induced apoptosis, while a kinase-dead MELK (D150A) does not, indicating that MELK kinase activity is required for suppression of Bcl-GL-dependent apoptosis.\",\n      \"method\": \"Pull-down assay with recombinant wild-type and kinase-dead MELK, immunocomplex kinase assay, TUNEL and FACS apoptosis analysis, siRNA knockdown\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with substrate identification plus kinase-dead mutant rescue experiment; multiple orthogonal methods\",\n      \"pmids\": [\"17280616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Xenopus MELK (xMELK) is required for completion of cytokinesis in early embryos. Endogenous xMELK accumulates at the equatorial cortex during anaphase. Overexpression of xMELK impairs cytokinesis and prevents accumulation of activated RhoA at the division furrow. Endogenous xMELK associates and co-localizes with the cytokinesis organizer anillin.\",\n      \"method\": \"Xenopus embryo knockdown (xMELK morpholino), live imaging of xMELK localization, RhoA activation assay at furrow, xMELK overexpression, co-immunoprecipitation with anillin\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function phenotype (cytokinesis failure), localization by live imaging, Co-IP with anillin, RhoA mechanistic link; multiple orthogonal methods\",\n      \"pmids\": [\"21378312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The C. elegans MELK ortholog PIG-1 acts in the same genetic pathway as PAR-4/LKB1 and its partners STRD-1 and MOP-25.2 to promote asymmetric Q neuroblast division. A conserved threonine in the PIG-1 activation loop (T169), equivalent to the AMPK family phosphorylation site, is essential for PIG-1 activity, consistent with PAR-4 (LKB1) phosphorylating and activating PIG-1. PIG-1 localizes to centrosomes during Q-cell divisions independently of T169 or PAR-4.\",\n      \"method\": \"C. elegans genetic epistasis (double mutants par-4/pig-1, strd-1/pig-1), activation-loop mutagenesis (T169A), centrosome localization by imaging\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic epistasis with activation-loop mutagenesis and localization analysis; establishes PAR-4/LKB1 as upstream activator of PIG-1/MELK\",\n      \"pmids\": [\"23267054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MELK forms a protein complex with the transcription factor FOXM1 in glioma stem cells (GSCs). MELK phosphorylates and activates FOXM1 in a kinase-dependent manner, leading to upregulation of mitotic regulatory genes. This MELK-dependent FOXM1 activation is further modulated by PLK1, which trans-phosphorylates FOXM1 in the complex.\",\n      \"method\": \"Co-immunoprecipitation (MELK-FOXM1 complex), in vitro kinase assay (FOXM1 phosphorylation), siRNA knockdown, neurosphere formation, luciferase reporter for FOXM1 target genes\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP, in vitro kinase assay, kinase-dependence validation, multiple orthogonal approaches; replicated across labs\",\n      \"pmids\": [\"23404835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MELK is regulated by JNK signaling and forms a complex with the oncoprotein c-JUN specifically in GSCs but not in normal neural progenitors. MELK silencing induces p53 expression, while p53 inhibition induces MELK expression, indicating mutual exclusivity. MELK silencing-mediated GSC apoptosis is partially rescued by both pharmacological p53 inhibition and p53 gene silencing, indicating MELK action is p53-dependent.\",\n      \"method\": \"Co-immunoprecipitation (MELK-c-JUN), shRNA-mediated MELK knockdown, pharmacological p53 inhibition, p53 siRNA, in vivo intracranial tumor model\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and epistasis by genetic/pharmacological rescue; single lab, multiple methods\",\n      \"pmids\": [\"23339114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of MELK in complex with AMP-PNP and with nanomolar inhibitors were determined, providing structural characterization of the MELK active site, insight into the role of the UBA domain, and identification of key residues for achieving high binding potency.\",\n      \"method\": \"X-ray crystallography of MELK-AMP-PNP and MELK-inhibitor co-crystal structures\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — first crystal structures of MELK with ligands, structural characterization of active site and UBA domain; single lab\",\n      \"pmids\": [\"23914841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of MELK in U87 MG glioblastoma cells causes G1/S cell cycle arrest accompanied by cell death or senescence, mediated by increased p21(WAF1/CIP1) expression. This p21 induction results from consecutive activation of ATM, Chk2, and p53. The p53 activation in MELK-deficient cells is not due to increased p53 stability but to loss of MDMX (an inhibitor of p53 transactivation). MELK loss leads to accumulation of DNA double-strand breaks during replication, stalled replication forks, and reduced fork progression speed.\",\n      \"method\": \"siRNA-mediated MELK knockdown with siRNA-resistant MELK rescue, γH2AX foci analysis, DNA fiber assay (replication fork speed), immunoblotting for ATM/Chk2/p53/MDMX, flow cytometry for cell cycle\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO/rescue experiment with multiple orthogonal mechanistic readouts (ATM/Chk2/p53 pathway, DNA fiber analysis, MDMX); single lab but rigorous\",\n      \"pmids\": [\"23836907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RACK1 (Receptor for Activated protein Kinase C) was identified as a partner of Xenopus MELK (xMELK). RACK1 co-localizes with xMELK at tight junctions in epithelial cells. A truncated RACK1 construct interferes with xMELK localization at cell-cell contacts. Cell-cycle-dependent localization of xMELK differs between epithelial (enriched at apical junctional complex) and mesenchyme-like cells (uniform cortical distribution).\",\n      \"method\": \"Co-immunoprecipitation (xMELK-RACK1), immunofluorescence colocalization, dominant-negative RACK1 construct, live cell imaging\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and localization with functional interference via truncated RACK1; single lab\",\n      \"pmids\": [\"24167714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of MPK38/MELK (T167E active mutant) in complex with OTSSP167 was determined, showing the detailed protein-inhibitor interactions and confirming that OTSSP167 fits into the MELK active site.\",\n      \"method\": \"X-ray crystallography of MPK38-OTSSP167 co-crystal\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination; single lab but direct structural method\",\n      \"pmids\": [\"24657156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MELK is identified as an oncogenic kinase from an in vivo tumorigenesis screen. In basal-like breast cancer (BBC) cells, MELK ablation selectively impairs proliferation (in vitro and in vivo), induces caspase-dependent cell death preceded by defective mitosis. MELK overexpression in BBC is largely dependent on FoxM1 transcriptional regulation. Melk knockout mice are viable and develop normally, indicating MELK is not required for normal development.\",\n      \"method\": \"Kinome-wide ORF in vivo tumorigenesis screen, shRNA knockdown, CRISPR-independent KO mouse, caspase assay, mitosis imaging, xenograft\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo screen, KO mouse validation, multiple orthogonal cellular assays including caspase and mitosis analysis; single lab but rigorous\",\n      \"pmids\": [\"24844244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EZH2 is a target of the MELK-FOXM1 complex in GSCs. MELK or FOXM1 promotes GSC radioresistance through regulation of EZH2 expression. The MELK-EZH2 signaling axis is conserved in C. elegans.\",\n      \"method\": \"Gain- and loss-of-function studies (shRNA, overexpression), co-expression analysis in GBM, C. elegans genetic analysis\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined radioresistance readout; evolutionary conservation; single lab\",\n      \"pmids\": [\"25601206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MELK-T1 (a selective MELK inhibitor) triggers rapid, proteasome-dependent degradation of MELK protein. MELK-T1 treatment induces accumulation of stalled replication forks and DNA double-strand breaks, culminating in replicative senescence, ATM activation, CHK2 phosphorylation, p53 phosphorylation, p21 upregulation, and FOXM1 target gene down-regulation in MCF-7 breast cancer cells.\",\n      \"method\": \"Pharmacological inhibition with MELK-T1, proteasome inhibitor rescue, γH2AX foci, immunoblotting for ATM/CHK2/p53/p21/FOXM1\",\n      \"journal\": \"Bioscience reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with multiple pathway readouts and proteasome-inhibitor rescue; single lab\",\n      \"pmids\": [\"26431963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MELK phosphorylates eIF4B at Ser406 during mitosis. MELK and eIF4B form a complex during mitosis (identified by immunoprecipitation/mass spectrometry). The MELK-eIF4B axis regulates protein synthesis during mitosis; specifically, synthesis of the anti-apoptotic protein MCL1 depends on MELK-eIF4B function. Inactivation of MELK or eIF4B reduces MCL1 protein synthesis and induces apoptotic cancer cell death.\",\n      \"method\": \"Immunoprecipitation/mass spectrometry, peptide library substrate profiling, in vitro kinase assay (eIF4B Ser406 phosphorylation), protein synthesis assay, apoptosis assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — substrate identified by IP/MS, in vitro kinase assay confirms phosphorylation, functional consequence (MCL1 synthesis, apoptosis) established; multiple orthogonal methods\",\n      \"pmids\": [\"27528663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MELK kinase inhibition (by MELK-T1, OTS167, and siRNA knockdown) induces p21 protein expression in p53-deficient cancer cells. FOXO1 and FOXO3 are phosphorylated by MELK and are involved in p21 induction after MELK inhibition, indicating a p53-independent mechanism of p21 regulation by MELK.\",\n      \"method\": \"siRNA knockdown of MELK in p53-deficient cell lines, pharmacological inhibition (OTS167), immunoblotting for p21/FOXO1/FOXO3 phosphorylation, flow cytometry cell cycle analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined pathway (FOXO1/3 phosphorylation) in p53-null context; single lab\",\n      \"pmids\": [\"28938528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MELK phosphorylates Ser-149 of the HIV-1 capsid protein in the multimerized HIV-1 core, triggering uncoating to promote viral cDNA synthesis. Depletion of MELK inhibits HIV-1 cDNA synthesis with a concomitant delay of capsid disassembly. A phosphorylation-mimetic HIV-1 capsid mutant (S149E) undergoes premature capsid disassembly and earlier cDNA synthesis, but fails to enter the nucleus.\",\n      \"method\": \"Genetic screening of T-cells, MELK depletion (siRNA), in vitro kinase assay (capsid phosphorylation at Ser-149), phospho-mimetic capsid mutant, capsid uncoating assay, HIV-1 cDNA synthesis assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with specific substrate (capsid Ser-149), phospho-mimetic mutant validation, functional consequence (premature uncoating/cDNA synthesis); multiple orthogonal methods\",\n      \"pmids\": [\"28683086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MELK promotes melanoma growth by activating the NF-κB pathway via Sequestosome 1 (SQSTM1/p62). MELK is transcriptionally upregulated by the MAPK pathway through transcription factor E2F1 in melanoma cells. SILAC phosphoproteomics after MELK inhibition identified 469 proteins with reduced phosphorylation, 139 of which are known BRAF/MEK substrates, positioning MELK as a downstream mediator of the MAPK pathway.\",\n      \"method\": \"SILAC phosphoproteomics, shRNA knockdown, pharmacological inhibition, NF-κB reporter assay, E2F1 ChIP and promoter analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SILAC phosphoproteomics plus NF-κB/E2F1 functional assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"29212029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Wild-type p53 suppresses MELK expression by repressing FOXM1 transcription indirectly through reduction of E2F1 binding to the FOXM1 promoter (shown by ChIP assay). Promoter deletion studies identified a FOXM1-binding site in the MELK promoter as the p53-responsive region. Loss of wild-type p53 (by mutation) in TNBC induces MELK expression via derepression of FOXM1.\",\n      \"method\": \"Promoter deletion studies, site-directed mutagenesis, ChIP assay (E2F1 at FOXM1 promoter, FOXM1 at MELK promoter), p53 gain- and loss-of-function, western blotting\",\n      \"journal\": \"NPJ breast cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP assay plus promoter deletion/mutagenesis; single lab, multiple methods identifying the p53-E2F1-FOXM1-MELK regulatory cascade\",\n      \"pmids\": [\"31909186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In basal-like breast cancer cells, genetic deletion or acute pharmacological depletion of MELK (using CRISPR/Cas9 KO, selective inhibitor HTH-01-091, chemical-induced protein degradation, shRNA, or CRISPRi) does NOT significantly affect cellular growth under common culture conditions. This contradicts previous RNAi-based findings and reveals that widely-used OTSSP167 has poor selectivity for MELK, and that prior MELK-targeting shRNAs have off-target effects.\",\n      \"method\": \"CRISPR/Cas9 knockout, novel selective MELK inhibitor (HTH-01-091), chemical-induced protein degradation, RNA interference, CRISPR interference\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — five independent genetic/chemical perturbation approaches; rigorous negative result replicated with multiple orthogonal tools\",\n      \"pmids\": [\"28926338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MELK bound to EZH2 and phosphorylated EZH2 at S220 in medulloblastoma stem-like cells. This phosphorylation was concomitant with loss of EZH2 K222 ubiquitination, suggesting phosphorylation-dependent protection from ubiquitination. In turn, EZH2 mediates methylation of MELK, creating a cooperative regulatory loop.\",\n      \"method\": \"Co-immunoprecipitation (MELK-EZH2), quantitative mass spectrometry analysis of phosphorylation and ubiquitination sites, loss-of-function studies (shRNA/inhibitors), xenograft models\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mass spectrometry-based PTM mapping; single lab\",\n      \"pmids\": [\"28536141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MELK phosphorylates EZH2 at S220, preventing K222 ubiquitination and thereby stabilizing EZH2. Quantitative MS confirmed the MELK-dependent increase in EZH2 S220 phosphorylation and concomitant decrease in K222 ubiquitination. MELK inhibition (chemical and genetic) leads to EZH2 ubiquitination and proteasomal degradation. USP36 was identified as the deubiquitinase that removes ubiquitin from EZH2 K222. FOXM1 is not involved in MELK-mediated EZH2 stability in NKTL (unlike in glioma).\",\n      \"method\": \"Quantitative mass spectrometry (phospho- and ubiquitin-site mapping), chemical and genetic MELK inhibition, ubiquitination assay, USP36 identification, tissue microarray\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — quantitative MS for PTM mapping, chemical + genetic inhibition, USP36 identified as deubiquitinase; multiple orthogonal methods\",\n      \"pmids\": [\"31434700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MELK phosphorylates PRAS40 (an inhibitory subunit of mTORC1), disrupting the interaction between PRAS40 and raptor, thereby over-activating mTORC1 signaling in clear cell renal cell carcinoma.\",\n      \"method\": \"Loss- and gain-of-function assays (siRNA, overexpression), co-immunoprecipitation (PRAS40-raptor interaction), phosphorylation analysis, mTORC1 pathway readouts\",\n      \"journal\": \"Cell transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing PRAS40-raptor disruption, phosphorylation analysis; single lab\",\n      \"pmids\": [\"31813279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MELK interacts with p21 through the CDK-binding region of p21 and the C-terminal domain of MELK. MELK phosphorylates p21 at Thr55, stimulating p21 nuclear translocation, CDK2-p21 and CDK4-p21 complex formation, and inhibition of CDK2-cyclin E and CDK4-cyclin D assembly. p21 phosphorylation by MELK at Thr55 reduces PPARγ transactivation required for adipogenesis. Restoration of p21 by adenoviral delivery in diet-induced obese mice ameliorates metabolic abnormalities in a MELK phosphorylation-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay (p21 Thr55 phosphorylation), nuclear translocation assay, CDK complex formation assay, adenoviral delivery in mice, CRISPR knockin validation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with specific phosphosite, in vivo rescue in mice, CDK complex analysis, multiple orthogonal methods\",\n      \"pmids\": [\"31097688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MELK expression correlates with tumor mitotic activity across cancer types. Multiple MELK-null CRISPR/Cas9 clones across cancer types proliferate at wild-type levels in vitro, under environmental stress, in the presence of cytotoxic chemotherapies, and in vivo. Combination of MELK-KO clones with a highly specific MELK inhibitor (HTH-01-091) shows no specific anti-proliferative phenotype, indicating that acute MELK inhibition is not sufficient for anti-tumor activity as a monotherapy.\",\n      \"method\": \"CRISPR/Cas9 knockout (multiple clones across cancer types), specific MELK inhibitor HTH-01-091, in vitro proliferation assays, xenograft in vivo studies, gene expression correlation analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple CRISPR KO clones across cancer types combined with selective inhibitor, in vitro and in vivo; replicated negative finding with rigorous controls\",\n      \"pmids\": [\"29417930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SANGUINARINE disrupts the association between STRAP and MELK in colorectal cancer cells by dephosphorylating both proteins, triggering intrinsic (Bax-dependent) apoptosis. The STRAP-MELK interaction is observed in Bax-positive cells but not Bax-negative cells. MELK kinase activity was measured in vitro.\",\n      \"method\": \"Co-immunoprecipitation (STRAP-MELK), immunofluorescence colocalization, in vitro kinase activity assay, flow cytometry apoptosis analysis\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and in vitro kinase assay, functional link to apoptosis; single lab\",\n      \"pmids\": [\"29783958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MELK inhibition (NVS-MELK8a, a highly selective MELK inhibitor) delays mitotic entry in triple-negative breast cancer cells, manifesting as lengthened G2 phase (confirmed by live-cell microscopy with fluorescent PCNA). This G2 delay is associated with delayed activation of Aurora A, Aurora B, and CDK1. After this delay, cells enter and complete mitosis, with impaired growth due to cell cycle perturbation rather than apoptosis induction.\",\n      \"method\": \"MIB/MS selectivity profiling, resazurin/crystal violet proliferation assays, double-thymidine synchronization, immunoblotting, live-cell microscopy with fluorescent PCNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — selective inhibitor validated by MIB/MS, live-cell microscopy confirming G2 delay, Aurora/CDK1 activation analysis; multiple orthogonal methods\",\n      \"pmids\": [\"31896573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Smad proteins regulate MPK38/MELK kinase activity in an opposing manner: Smad2/3/4 increase MPK38-mediated ASK1/TGF-β/p53 signaling and stabilize MPK38, while Smad7 decreases MPK38 activity and stability. Smads2/3/4 attenuate the interaction between MPK38 and its negative regulator thioredoxin (Trx), and enhance the interaction with its positive regulator ZPR9. MPK38 phosphorylates Smad2 at S245, Smad3 at S204, Smad4 at S343, and Smad7 at T96; phosphorylation-defective Smad mutants lose the ability to regulate MPK38.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay (MPK38 phosphorylation of Smads at specific residues), phosphorylation-defective Smad mutants, adenoviral overexpression in HFD-fed obese mice, metabolic phenotyping\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, Co-IP, in vivo adenoviral rescue; single lab with multiple methods\",\n      \"pmids\": [\"29700281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZPR9 (zinc finger protein) is an activator of MPK38/MELK. The association of MPK38 and ZPR9 is mediated by specific cysteine residues (Cys269/Cys286 of MPK38, Cys305/Cys308 of ZPR9). MPK38 phosphorylates ZPR9 at Thr252; phosphorylation at Thr252 is required for ZPR9 to enhance MPK38-mediated ASK1, TGF-β, and p53 signaling and stabilize MPK38. ZPR9 competes with the negative regulator thioredoxin (Trx) for MPK38 binding.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay (ZPR9 Thr252 phosphorylation), cysteine and Thr252 mutants, CRISPR/Cas9 knockin (T252A), conditional knockdown, HFD mouse model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with specific site, CRISPR knockin validation, multiple mutant analyses; single lab but rigorous\",\n      \"pmids\": [\"28195154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MELK interacts with STAT3 (by co-immunoprecipitation) and induces STAT3 phosphorylation, leading to increased expression of its target gene CCL2 in HCC. This CCL2 upregulation promotes M2 macrophage polarization and impairs CD8+ T-cell recruitment, contributing to immunosuppression. MELK is also regulated upstream by miR-505-3p.\",\n      \"method\": \"IP-MS and Co-IP (MELK-STAT3 interaction), luciferase assays, RNA sequencing, murine xenograft and lung metastasis models, macrophage polarization assay\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and IP-MS confirming MELK-STAT3 interaction with downstream functional readout (CCL2, macrophage polarization); single lab\",\n      \"pmids\": [\"38970074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In C. elegans, PIG-1/MELK is required for partitioning of CES-1 Snail (anti-apoptotic factor) during asymmetric NSM neuroblast division. PIG-1/MELK acts through phosphorylation and cortical enrichment of nonmuscle myosin II prior to neuroblast division, promoting actomyosin contractility that drives apoptotic fate through CES-1 Snail asymmetric partitioning. pig-1/MELK is controlled by both a ces-1 Snail- and par-4/LKB1-dependent pathway.\",\n      \"method\": \"C. elegans genetics (pig-1 mutants, epistasis with ces-1 and par-4), imaging of nonmuscle myosin II cortical localization, CES-1 Snail partitioning analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with imaging of myosin cortical localization; establishes PIG-1/MELK → myosin II → CES-1 partitioning pathway; single lab\",\n      \"pmids\": [\"32946434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MELK has a direct interaction with MLST8 (a component of both mTORC1 and mTORC2) in endometrial carcinoma cells, demonstrated by co-immunoprecipitation. This interaction activates both mTORC1 and mTORC2 signaling pathways to promote EC progression. MELK expression is transcriptionally regulated by E2F1 (confirmed by ChIP and luciferase assay).\",\n      \"method\": \"Co-immunoprecipitation (MELK-MLST8), chromatin immunoprecipitation (E2F1 at MELK promoter), luciferase reporter assay, knockdown/overexpression studies, xenograft\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with MLST8, ChIP for upstream E2F1 regulation, functional mTOR pathway readout; single lab\",\n      \"pmids\": [\"31915116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MELK inhibition in DIPG cells functions through reducing inhibitory phosphorylation of PPARγ, resulting in increased nuclear translocation and transcriptional activity of PPARγ (MELK-PPARγ signaling axis identified by RNA sequencing of inhibitor-treated cells).\",\n      \"method\": \"MELK inhibitor (OTSSP167) treatment, RNA sequencing of treated DIPG cells, PPARγ phosphorylation and nuclear translocation analysis, xenograft model\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA sequencing plus PPARγ phosphorylation/nuclear translocation analysis after MELK inhibition; single lab\",\n      \"pmids\": [\"30061363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MELK activates the PI3K/mTOR signaling pathway and promotes DLAT (Dihydrolipoamide S-Acetyltransferase) expression, stabilizing mitochondrial function, improving mitochondrial respiration, reducing intracellular ROS, and promoting resistance to elesclomol-induced cuproptosis in HCC.\",\n      \"method\": \"MELK knockdown/overexpression, PI3K/mTOR pathway inhibition, DLAT expression analysis, mitochondrial function assays, elesclomol resistance assay, TOM20 and DLAT oligomer analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss/gain-of-function with PI3K/mTOR readouts and mitochondrial functional assays; single lab\",\n      \"pmids\": [\"37949877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In cancer cells with conditional MELK dependency, abrogation of MELK expression has little effect under high-density common culture conditions but MELK dependency becomes apparent in clonogenic growth assays with both RNAi and CRISPR technologies. This conditional dependency pattern resembles oncogenes (MYC, KRAS) rather than essential genes (classic mitotic kinases).\",\n      \"method\": \"RNAi and CRISPR-mediated MELK depletion under varying cell density conditions, clonogenic assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic comparison of culture conditions with both genetic tools; single lab but addresses important context-dependence\",\n      \"pmids\": [\"30391850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MELK binds to FABP5 (fatty acid-binding protein 5) and affects its ubiquitination through the K48R pathway (K48-linked ubiquitin) to increase FABP5 stability, thereby activating the Akt/mTOR signaling axis and suppressing RFA-mediated immunogenic cell death in HCC.\",\n      \"method\": \"Co-immunoprecipitation (MELK-FABP5), ubiquitination assay (K48R pathway), Akt/mTOR pathway analysis, RFA tumor model, nanoparticle delivery (RGD-LNPs)\",\n      \"journal\": \"Military Medical Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with FABP5, ubiquitination pathway analysis, Akt/mTOR readout; single lab\",\n      \"pmids\": [\"39871325\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MELK is a Snf1/AMPK-family serine/threonine kinase that is activated during mitosis through phosphorylation by MPF (CDK1/cyclin B) and MAPK at specific T-loop and C-terminal residues; its minimal active unit comprises the N-terminal catalytic domain plus the flanking UBA domain, while a C-terminal fragment acts as an autoinhibitory domain. MELK promotes cell proliferation and cancer stem cell survival through multiple mechanisms: it phosphorylates and activates FOXM1 (in cooperation with PLK1), phosphorylates and stabilizes EZH2 (blocking K222 ubiquitination by competiting with USP36), phosphorylates eIF4B at Ser406 to sustain mitotic protein synthesis (including MCL1), suppresses the pro-apoptotic function of Bcl-GL, interacts with STAT3 to drive CCL2 expression and immunosuppression, and phosphorylates PRAS40 to hyperactivate mTORC1. MELK also inhibits pre-mRNA splicing by recruiting NIPP1 via phospho-Thr478, localizes to the equatorial cortex during cytokinesis where it interacts with anillin and regulates RhoA, and in C. elegans its ortholog PIG-1 drives asymmetric neuroblast division through phosphorylation of nonmuscle myosin II downstream of the LKB1/PAR-4 pathway. MELK transcription is directly controlled by E2F family members and indirectly suppressed by wild-type p53 through E2F1-FOXM1. Despite this extensive mechanistic literature, genetic CRISPR deletion of MELK in cancer cells under standard conditions does not impair proliferation, revealing a context-dependent requirement and raising questions about the selectivity of widely used inhibitors such as OTSSP167.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MELK is a Snf1/AMPK-family serine/threonine kinase that couples mitotic cell-cycle progression to the survival and self-renewal programs of proliferating and cancer stem cells [#0, #16]. Its catalytic core comprises the N-terminal kinase domain plus the flanking UBA domain as the minimal active unit, with a C-terminal autoinhibitory region; activity depends on activation-loop autophosphorylation (Thr167/Ser171), reducing conditions, and is inhibited by Ca2+ [#2]. MELK is activated specifically during M-phase through direct phosphorylation by MPF (CDK1/cyclin B) and MAPK on T-loop and C-terminal residues, explaining its mitotic timing [#6], and in the C. elegans ortholog PIG-1 the activation-loop threonine is supplied by the upstream PAR-4/LKB1 kinase to drive asymmetric neuroblast division via cortical nonmuscle myosin II [#9, #35]. Once active, MELK phosphorylates a broad substrate set to sustain proliferation and block apoptosis: it forms a complex with FOXM1 and phosphorylates it (with PLK1) to drive mitotic gene expression [#10], phosphorylates and stabilizes EZH2 at Ser220 by blocking K222 ubiquitination in competition with USP36 [#26], phosphorylates eIF4B at Ser406 to maintain mitotic synthesis of the anti-apoptotic protein MCL1 [#19], and suppresses Bcl-GL-induced apoptosis in a kinase-dependent manner [#7]. MELK additionally feeds into mTOR signaling through PRAS40 and MLST8 [#27, #36], engages STAT3 to drive CCL2-dependent immunosuppression [#34], and through an FHA-domain interaction with NIPP1 dependent on phospho-Thr478 inhibits an early step of spliceosome assembly independently of its catalytic activity [#1]. MELK transcription is a direct E2F target and is derepressed when wild-type p53 is lost, via the p53–E2F1–FOXM1 axis [#4, #23]. Despite this extensive substrate literature, CRISPR deletion and acute selective inhibition of MELK across multiple cancer cell types do not impair proliferation under standard conditions, demonstrating a conditional, context-dependent requirement and exposing the poor selectivity of widely used inhibitors such as OTSSP167 [#24, #29, #39].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established MELK's molecular identity, placing an uncharacterized maternal transcript into the Snf1/AMPK kinase family and predicting serine/threonine kinase activity.\",\n      \"evidence\": \"Differential display cloning and sequence analysis of the kinase domain and leucine zipper in mouse eggs/embryos\",\n      \"pmids\": [\"9136115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional reconstitution of kinase activity\", \"No substrates or pathway identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed a kinase-independent function: MELK inhibits spliceosome assembly by docking onto NIPP1, showing that a phosphosite (Thr478) rather than catalysis mediates this activity.\",\n      \"evidence\": \"FHA-domain binding assays, in vitro spliceosome assembly in nuclear extracts, kinase-dead and T478A mutants\",\n      \"pmids\": [\"14699119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological splicing targets in cells not defined\", \"Link between mitotic NIPP1-MELK binding and cell-cycle splicing control unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the enzymatic and regulatory architecture of MELK, including activation-loop autophosphorylation, the minimal active kinase-UBA unit, C-terminal autoinhibition, and redox/Ca2+ control.\",\n      \"evidence\": \"In vitro kinase assays, autophosphorylation site mapping, domain deletion constructs, Ca2+-binding and mutagenesis\",\n      \"pmids\": [\"16216881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Broad substrate specificity leaves physiological substrates undefined\", \"Mechanism of Ca2+ inhibition in vivo unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected MELK to proliferation control by placing its transcription under E2F and pocket-protein regulation and tying it to neural progenitor self-renewal via B-myb.\",\n      \"evidence\": \"E2F promoter mutagenesis and pocket-protein knockout comparisons; siRNA/overexpression and neurosphere assays in neural progenitors\",\n      \"pmids\": [\"16144839\", \"16061694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MELK substrates driving self-renewal not identified\", \"Relationship between transcriptional control and kinase function unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Explained why MELK acts in mitosis by identifying MPF and MAPK as direct upstream activating kinases that phosphorylate MELK at M-phase-specific sites.\",\n      \"evidence\": \"M-phase Xenopus egg extract phosphosite mapping by MS plus in vitro kinase assays with recombinant MPF/MAPK\",\n      \"pmids\": [\"16628004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of each phosphosite not dissected\", \"How activation couples to downstream substrates not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed the MELK ortholog PIG-1 controls cell polarity and asymmetric division, not just cell cycle, transforming an apoptotic daughter into a neuron when lost.\",\n      \"evidence\": \"C. elegans pig-1 loss-of-function with cell-size and fate analysis\",\n      \"pmids\": [\"16774992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular substrate driving asymmetry unknown at this stage\", \"Upstream activator not yet defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided the first anti-apoptotic substrate link, showing MELK binds and phosphorylates Bcl-GL and suppresses Bcl-GL-induced death in a kinase-dependent manner.\",\n      \"evidence\": \"Pull-downs, immunocomplex kinase assay, kinase-dead (D150A) rescue, TUNEL/FACS apoptosis assays\",\n      \"pmids\": [\"17280616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite on Bcl-GL not mapped\", \"In vivo relevance to tumor survival not tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined a cytokinetic role: MELK accumulates at the equatorial cortex, associates with anillin, and is required for RhoA-dependent furrowing.\",\n      \"evidence\": \"Xenopus embryo morpholino knockdown, live imaging, RhoA activation assay, Co-IP with anillin\",\n      \"pmids\": [\"21378312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytokinetic substrate of MELK not identified\", \"Mechanism of cortical recruitment unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified PAR-4/LKB1 as the upstream activating kinase of PIG-1/MELK via the conserved activation-loop threonine, defining the kinase cascade controlling asymmetric division.\",\n      \"evidence\": \"C. elegans genetic epistasis (par-4, strd-1, mop-25.2), T169A activation-loop mutagenesis, centrosome localization imaging\",\n      \"pmids\": [\"23267054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LKB1 directly phosphorylates mammalian MELK not shown\", \"Centrosomal function of PIG-1 not mechanistically defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established MELK as a driver of cancer stem cell programs by showing it complexes with and phosphorylates FOXM1 (with PLK1) and feeds into c-JUN/p53-dependent survival in glioma stem cells.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, shRNA, luciferase reporters, intracranial tumor models\",\n      \"pmids\": [\"23404835\", \"23339114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"FOXM1 phosphosite(s) by MELK not fully mapped\", \"Distinction between transcriptional autoregulation and direct phosphorylation incomplete\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked MELK loss to genome stability, showing depletion causes replication-fork stalling, DNA breaks, and ATM-Chk2-p53-p21 arrest via MDMX loss.\",\n      \"evidence\": \"siRNA with rescue, gammaH2AX foci, DNA fiber assays, ATM/Chk2/p53/MDMX immunoblotting, cell-cycle flow cytometry\",\n      \"pmids\": [\"23836907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MELK substrate at replication forks not identified\", \"Later genetic studies question generality of this proliferation requirement\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided structural definition of the MELK active site and UBA domain and the basis for nanomolar inhibitor binding.\",\n      \"evidence\": \"X-ray crystallography of MELK with AMP-PNP and inhibitors\",\n      \"pmids\": [\"23914841\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of full-length autoinhibited enzyme\", \"Conformational basis of activation not captured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Validated MELK as an oncogenic kinase in basal-like breast cancer while showing it is dispensable for normal development, foreshadowing context-dependence.\",\n      \"evidence\": \"In vivo kinome ORF tumorigenesis screen, shRNA, KO mouse, caspase and mitosis assays, xenografts; OTSSP167 co-crystal\",\n      \"pmids\": [\"24844244\", \"24657156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RNAi-based dependency later challenged by CRISPR studies\", \"OTSSP167 selectivity not yet questioned at this point\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified eIF4B-Ser406 as a MELK substrate that sustains mitotic translation of MCL1, providing a direct molecular route from MELK to apoptosis resistance.\",\n      \"evidence\": \"IP/MS, peptide-library substrate profiling, in vitro kinase assay, protein synthesis and apoptosis assays\",\n      \"pmids\": [\"27528663\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other mitotic translation targets not enumerated\", \"Contribution relative to other MELK survival pathways unquantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated MELK stabilizes EZH2 by phosphorylating Ser220 to block K222 ubiquitination, with USP36 identified as the relevant deubiquitinase, linking MELK to epigenetic silencing.\",\n      \"evidence\": \"Co-IP, quantitative MS for phospho/ubiquitin sites, chemical and genetic MELK inhibition, ubiquitination assays\",\n      \"pmids\": [\"28536141\", \"31434700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context-specificity (FOXM1-dependent vs independent) across tumor types unresolved\", \"Cooperative EZH2-mediated MELK methylation loop incompletely defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined MELK's redox-coupled regulatory network and TGF-beta/p53 substrate set, showing ZPR9 and Smad2/3/4 activate and stabilize MELK while thioredoxin and Smad7 inhibit it.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays with phosphosite mutants, CRISPR knockin, adenoviral rescue in obese mice\",\n      \"pmids\": [\"28195154\", \"29700281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of metabolic and mitotic MELK functions unclear\", \"In vivo significance of Smad phosphosites in cancer not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Broadened MELK function beyond proliferation by showing it phosphorylates HIV-1 capsid Ser149 to trigger uncoating required for viral cDNA synthesis.\",\n      \"evidence\": \"T-cell genetic screen, siRNA depletion, in vitro capsid kinase assay, phospho-mimetic S149E mutant, uncoating/cDNA assays\",\n      \"pmids\": [\"28683086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relevance to MELK's endogenous cellular role unclear\", \"Spatiotemporal control of capsid phosphorylation undefined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Overturned the prevailing dependency model by showing CRISPR deletion, degradation, and a selective inhibitor (HTH-01-091) leave basal-like breast cancer growth intact, exposing OTSSP167 off-target effects.\",\n      \"evidence\": \"Five orthogonal perturbations (CRISPR KO, HTH-01-091, chemical degradation, RNAi, CRISPRi)\",\n      \"pmids\": [\"28926338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conditions under which MELK becomes required not yet defined here\", \"Reconciliation with prior in vivo screen results incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Generalized the negative result across cancer types and reframed MELK dependency as conditional, oncogene-like and density/clonogenic-context dependent rather than constitutively essential.\",\n      \"evidence\": \"Multiple CRISPR KO clones with HTH-01-091, in vitro/in vivo proliferation, clonogenic assays under varying density\",\n      \"pmids\": [\"29417930\", \"30391850\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinants of the conditional requirement unidentified\", \"Predictive biomarkers for MELK dependency absent\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Clarified the mitotic phenotype of acute MELK inhibition as a G2 delay with retarded Aurora/CDK1 activation rather than apoptosis, refining the kinase's cell-cycle role.\",\n      \"evidence\": \"Selective NVS-MELK8a inhibitor (MIB/MS validated), synchronization, live-cell PCNA microscopy, immunoblotting\",\n      \"pmids\": [\"31896573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MELK substrate controlling G2/M timing unknown\", \"Reconciliation with non-essentiality across conditions incomplete\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded MELK substrates into mTOR and CDK-inhibitor signaling, showing phosphorylation of PRAS40, MLST8 engagement, and p21-Thr55 phosphorylation controlling cell-cycle and metabolic outputs.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays with phosphosite mutants, CDK-complex assays, in vivo adenoviral rescue in obese mice, CRISPR knockin\",\n      \"pmids\": [\"31813279\", \"31915116\", \"31097688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy among multiple mTOR-activating mechanisms unresolved\", \"Tissue-specific deployment of these substrates unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked MELK to tumor immune evasion via STAT3-driven CCL2 expression, M2 macrophage polarization, and suppressed CD8+ T-cell recruitment.\",\n      \"evidence\": \"IP-MS/Co-IP, luciferase assays, RNA-seq, xenograft and metastasis models, macrophage polarization assays\",\n      \"pmids\": [\"38970074\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STAT3 phosphosite by MELK not mapped\", \"Single-lab finding without independent confirmation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended MELK function to metabolic and immunogenic-cell-death resistance through PI3K/Akt/mTOR activation, DLAT stabilization, and FABP5 ubiquitination control.\",\n      \"evidence\": \"Knockdown/overexpression, ubiquitination assays, mitochondrial function assays, Co-IP with FABP5, RFA tumor models\",\n      \"pmids\": [\"37949877\", \"39871325\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation vs indirect stabilization of these targets unclear\", \"Single-lab findings awaiting independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which physiological substrate(s) and genetic/microenvironmental contexts render MELK functionally required, reconciling its rich kinase biology with its dispensability under standard culture.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No defined biomarker predicting MELK dependency\", \"The conditional requirement seen in clonogenic/stress contexts lacks a mechanistic explanation\", \"Whether any single substrate (FOXM1, eIF4B, EZH2) is rate-limiting in vivo is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [7, 10, 19, 21, 26, 27, 28, 32, 33]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [2, 6, 19, 28]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 12]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [27, 36, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 14]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 16, 31, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [27, 34, 36]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [19, 26, 28]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [7, 19]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 23, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FOXM1\", \"EZH2\", \"NIPP1\", \"eIF4B\", \"STAT3\", \"PRAS40\", \"MLST8\", \"anillin\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}