{"gene":"MTCH2","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2010,"finding":"MTCH2/MIMP is a surface-exposed outer mitochondrial membrane protein that facilitates recruitment of tBID to mitochondria; knockout in embryonic stem cells, mouse embryonic fibroblasts, and conditional knockout in liver hindered tBID recruitment, Bax/Bak activation, MOMP, and apoptosis, establishing MTCH2 as a critical facilitator of the Fas/death-receptor apoptotic pathway.","method":"Conditional knockout mice (liver-specific), embryonic stem cell and MEF knockout, in vivo and in vitro tBID recruitment assays, MOMP measurement, apoptosis assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal loss-of-function in multiple cell types and in vivo model, multiple orthogonal readouts (tBID recruitment, Bax/Bak activation, MOMP, apoptosis), replicated across tissues","pmids":["20436477"],"is_preprint":false},{"year":2012,"finding":"The molecular interaction between tBID and MTCH2 was mapped to two specific binding sites: tBID residues 59–73 binding MTCH2 residues 140–161, and tBID residues 111–125 binding MTCH2 residues 240–290, as determined by peptide array screening combined with biochemical and biophysical characterization.","method":"Peptide array screening, biochemical binding assays, biophysical techniques (characterizing tBID–MTCH2 interaction at structural/molecular level)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (peptide arrays, biochemical, biophysical) in single lab; binding sites precisely mapped but no crystal/cryo-EM structure","pmids":["22416135"],"is_preprint":false},{"year":2015,"finding":"MTCH2 acts as a negative regulator of mitochondrial OXPHOS downstream of BID in haematopoietic stem cells (HSCs); loss of MTCH2 increases mitochondrial OXPHOS, mitochondrial size, ATP and ROS levels, and triggers HSC and progenitor entry into cell cycle, demonstrating MTCH2 is indispensable for HSC homeostasis.","method":"Conditional knockout mice (MTCH2 deletion in haematopoietic system), measurement of OXPHOS, ATP, ROS, mitochondrial size, cell cycle analysis, irradiation-induced apoptosis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with multiple orthogonal metabolic and functional readouts; epistasis with BID phosphorylation-deficient mutant places MTCH2 downstream of BID","pmids":["26219591"],"is_preprint":false},{"year":2016,"finding":"Both cardiolipin (CL) and MTCH2 can serve as redundant receptors for tBID at the mitochondrial outer membrane; depletion of either alone did not block tBID recruitment in HCT116 cells, but combined depletion of both CL and MTCH2 significantly reduced tBID recruitment, indicating functional redundancy.","method":"CRISPR/homologous recombination knockout of cardiolipin synthase in HCT116 cells, siRNA knockdown of MTCH2, tBID recruitment assay, TRAIL-induced apoptosis assay","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic double-depletion epistasis experiment with direct tBID recruitment readout, single lab but orthogonal genetic tools","pmids":["26794447"],"is_preprint":false},{"year":2018,"finding":"MTCH2 is a regulator of mitochondrial fusion required for naïve-to-primed pluripotency interconversion in murine ESCs; MTCH2-/- ESCs fail to elongate mitochondria and alter metabolism, and enforced mitochondrial elongation via MFN2 overexpression or dominant-negative DRP1 rescues exit from naïve pluripotency in MTCH2-/- ESCs.","method":"MTCH2 knockout ESCs, live mitochondrial imaging, metabolic profiling (glutamine utilization), histone acetylation measurement, epistasis rescue with MFN2 overexpression and DN-DRP1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis rescue (MFN2/DN-DRP1 rescue of MTCH2 KO phenotype) with multiple orthogonal readouts (mitochondrial morphology, metabolism, pluripotency markers, histone acetylation), single lab but rigorous","pmids":["30510213"],"is_preprint":false},{"year":2020,"finding":"MTCH2 cooperates with the E3 ubiquitin ligase MARCH5 and E2 conjugating enzyme UBE2K to mediate proteasomal degradation of MCL1 specifically when MCL1 is engaged by NOXA; this requires the MCL1 transmembrane domain and specific MCL1 lysine residues, placing MTCH2 as an essential component of a complex that marks the MCL1:NOXA complex for degradation.","method":"Genome-wide CRISPR-Cas9 screen, genetic validation, co-immunoprecipitation, proteasomal degradation assays, domain/mutant analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased genome-wide CRISPR screen identification followed by mechanistic validation with Co-IP and mutant analysis; MARCH5/UBE2K/MTCH2 complex precisely defined","pmids":["32094511"],"is_preprint":false},{"year":2021,"finding":"MTCH2 is a selective effector of starvation-induced mitochondrial hyperfusion (a cytoprotective response to nutrient deprivation) that stimulates mitochondrial fusion in a manner dependent on the bioactive lipogenesis intermediate lysophosphatidic acid (LPA), linking flux through the lipogenesis pathway to mitochondrial elongation and enhanced energy production.","method":"MTCH2 loss-of-function and gain-of-function in cell culture, starvation-induced hyperfusion assays, LPA supplementation/depletion, mitochondrial morphology imaging, energy production measurements","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional loss/gain-of-function with LPA epistasis, multiple readouts; single lab study","pmids":["34586346"],"is_preprint":false},{"year":2022,"finding":"MTCH2 is a mitochondrial outer membrane protein insertase required for insertion of biophysically diverse tail-anchored (TA), signal-anchored, and multipass α-helical proteins into the outer mitochondrial membrane but not β-barrel proteins; purified MTCH2 was sufficient to mediate insertion into reconstituted proteoliposomes; MTCH2 uses membrane-embedded hydrophilic residues (evolved from a solute carrier transporter) to act as a gatekeeper controlling mislocalization of TAs to the ER and modulating apoptosis sensitivity.","method":"Genome-wide CRISPR screens, purified protein reconstitution into proteoliposomes, functional and mutational studies, subcellular localization assays","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with purified protein in proteoliposomes, genome-wide CRISPR identification, mutational analysis; multiple orthogonal methods in single study","pmids":["36264797"],"is_preprint":false},{"year":2002,"finding":"MIMP/MTCH2 is induced by Met-HGF/SF signal transduction and localizes to mitochondria; ectopic MTCH2 expression reduces mitochondrial membrane potential (uncoupling activity) in a level-dependent manner, linking Met tyrosine kinase signaling to mitochondrial depolarization.","method":"Differential display PCR cloning, Northern and Western blot, immunostaining of HA-tagged and GFP-fusion MTCH2, subcellular fractionation, mitochondrial membrane potential measurement","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization confirmed by multiple methods (immunostaining, GFP fusion, fractionation) with functional membrane potential readout; single lab","pmids":["12407445"],"is_preprint":false},{"year":2006,"finding":"MTCH2/MIMP overexpression attenuates HGF/SF-induced cellular scattering and tumor growth by reducing Shc levels, preventing HGF/SF-induced tyrosine phosphorylation of Grb2 and Shc, and suppressing SRE-dependent transcription, while leaving PI3K signaling unaffected; this defines MTCH2 as a selective modulator of Met downstream signaling.","method":"Ectopic MTCH2 expression in cancer cells, HGF/SF stimulation, Western blotting for Met, Shc, Grb2, PI3K phosphorylation, SRE-luciferase reporter assay, in vivo tumor growth assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple signaling readouts with functional in vivo rescue; single lab","pmids":["16951184"],"is_preprint":false},{"year":2017,"finding":"Deletion of forebrain MTCH2 impairs mitochondria motility and calcium handling in hippocampal neurons, leading to deficits in spatial memory, long-term potentiation (LTP), and spontaneous excitatory synaptic currents, establishing MTCH2 as a critical regulator of neuronal mitochondria function required for hippocampus-dependent cognition.","method":"Forebrain-specific conditional MTCH2 knockout mice, live mitochondria motility imaging, calcium buffering assays, LTP electrophysiology, behavioral memory tests","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo conditional KO with direct mitochondria motility and calcium imaging plus electrophysiological and behavioral phenotypes; single lab","pmids":["28276496"],"is_preprint":false},{"year":2017,"finding":"MTCH2 is a conserved regulator of lipid homeostasis; its knockdown reduced lipid accumulation in adipocyte-like cells and in C. elegans and mice in vivo, while overexpression increased fat accumulation across species; MTCH2 influences lipid homeostasis partly through modulation of estrogen receptor 1 (ESR1) activity.","method":"RNAi knockdown and genetic mutant in C. elegans, shRNA knockdown and overexpression in cells and mice, lipid accumulation assays, ESR1 activity measurement","journal":"Obesity (Silver Spring, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conserved across three model systems with gain- and loss-of-function; ESR1 link is correlative rather than mechanistically dissected","pmids":["28127879"],"is_preprint":false},{"year":2020,"finding":"Stop codon read-through of MTCH2 mRNA generates two longer isoforms (MTCH2x and MTCH2xx); MTCH2xx is predominantly cytoplasmic (unlike mitochondrially-localized MTCH2 and MTCH2x) and rapidly degraded (t1/2 <1 h); CRISPR-generated read-through-deficient cells show increased MTCH2 expression and decreased mitochondrial membrane potential, demonstrating that double stop codon read-through regulates MTCH2 protein levels and mitochondrial membrane potential.","method":"Luminescence- and fluorescence-based read-through assays, ribosome profiling and mass spectrometry data analysis, CRISPR-Cas9 read-through-deficient cell generation, subcellular fractionation, mitochondrial membrane potential assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assays, ribosome profiling, MS, CRISPR KO) establishing novel regulatory mechanism; single lab","pmids":["33028634"],"is_preprint":false},{"year":2024,"finding":"Molecular dynamics simulations (coarse-grained and atomistic) demonstrate that MTCH2's membrane-spanning hydrophilic groove significantly reduces the free energy barrier for lipid movement across the membrane, enabling it to function as a lipid scramblase with a rate comparable to VDAC in the outer mitochondrial membrane.","method":"Coarse-grained and atomistic molecular dynamics simulations, free energy barrier calculations for lipid flip-flop","journal":"Structure (London, England : 1993)","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational simulation only; no direct in vitro scramblase activity measurement","pmids":["38377988"],"is_preprint":false},{"year":2025,"finding":"MTCH2 directly interacts with carnitine palmitoyltransferase 1 (CPT1) and modulates CPT1 sensitivity to malonyl-CoA inhibition, thereby regulating mitochondrial influx of free fatty acids and energy expenditure in adipocytes; adipocyte-specific ablation of MTCH2 improves mitochondrial function and whole-body energy expenditure independent of UCP1.","method":"Adipocyte-specific MTCH2 knockout mice, direct physical interaction assay (co-immunoprecipitation/pull-down), CPT1 activity and malonyl-CoA sensitivity assay, metabolic cage measurements, proteomic and RNA sequencing analyses","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct physical interaction with CPT1 demonstrated, in vivo KO with metabolic phenotype; single lab but multiple orthogonal methods","pmids":["41044057"],"is_preprint":false},{"year":2025,"finding":"MTCH2 deficiency promotes ubiquitin-proteasome-dependent degradation of E2F4, relieving E2F4-mediated transcriptional repression of transferrin receptor (TFRC) and thereby facilitating TFRC-mediated ferroptosis in colorectal cancer cells.","method":"MTCH2 conditional knockout mice, in vitro KO/OE in CRC cell lines, proteasomal ubiquitination assays for E2F4, chromatin immunoprecipitation for TFRC promoter, ferroptosis markers (ferrous ion, lipid ROS)","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO + in vitro mechanistic dissection of E2F4 ubiquitination and TFRC transcription; single lab","pmids":["40600459"],"is_preprint":false},{"year":2025,"finding":"MTCH2 suppresses thermogenesis in brown and subcutaneous white adipose tissue by negatively regulating autophagy through a Bcl-2-dependent mechanism; adipose-specific MTCH2 depletion stimulates thermogenesis, upregulates UCP1, enhances mitochondrial biogenesis, and increases lipolysis.","method":"Adipose-specific MTCH2 knockout mice, high-fat diet model, RNA sequencing + proteomics, Bcl-2 pathway epistasis, UCP1 and mitochondrial biogenesis measurements","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo adipose-specific KO with integrated omics and Bcl-2 epistasis; Bcl-2 mechanistic link relies on integrated analysis rather than direct biochemical reconstitution","pmids":["40051328"],"is_preprint":false},{"year":2025,"finding":"Selenoprotein H (SelH) interacts directly with MTCH2 (identified by Co-IP combined with mass spectrometry and molecular docking), and SelH targets MTCH2 to regulate mitofusin 2 (MFN2)-dependent mitochondrial fusion and quality control, thereby alleviating oxidative stress and apoptosis in acute kidney injury.","method":"Co-immunoprecipitation with mass spectrometry, laser confocal co-localization, molecular docking, SelH/MTCH2 knockdown and overexpression in HEK293t cells and SelH KO mice, mitochondrial dynamics and MFN2 assays","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP + MS identification of MTCH2 as SelH interactor, in vivo KO validation, MFN2 epistasis; single lab","pmids":["41314281"],"is_preprint":false},{"year":2025,"finding":"MTCH2 directly binds copper and functions as a copper-binding regulator that coordinates mitochondrial copper distribution and morphology; skeletal muscle-specific deletion of copper importer Ctr1 causes copper deficiency, mitochondrial hyperfusion, and myopathic features that are mechanistically linked to MTCH2, and copper restoration rescues mitochondrial function.","method":"Skeletal muscle-specific Ctr1 knockout mice, MTCH2 copper-binding characterization, AAV-mediated Ctr1 re-expression rescue, copper ionophore treatment, electron transport chain proteomics, mitochondrial morphology imaging","journal":"bioRxiv : the preprint server for biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with copper-binding characterization and rescue; preprint, not yet peer-reviewed","pmids":["41332672"],"is_preprint":true},{"year":2026,"finding":"MTCH2 localizes near BAX and BAK assemblies specifically under apoptotic conditions (mapped by in situ proximity labeling); cells lacking MTCH2 exhibit delayed BAX and BAK oligomerization at the single-particle level, which is rescued by addition of lysophosphatidic acid (LPA); MTCH2 depletion decreases apoptosis sensitivity, sublethal mitochondrial permeabilization during bacterial infection, mitochondrial DNA release, and cGAS-STING activation.","method":"In situ proximity labeling (BioID/APEX), single-particle BAX/BAK oligomerization imaging, MTCH2 knockout cells, LPA rescue experiments, apoptosis assays, bacterial infection model, mtDNA release and cGAS-STING activation measurement","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proximity labeling, single-particle imaging, genetic KO, LPA epistasis, downstream pathway readouts); rigorous mechanistic dissection of MTCH2's role in BAX/BAK pore assembly","pmids":["42056306"],"is_preprint":false},{"year":2025,"finding":"CuB (Cucurbitacin B) covalently targets MTCH2 at the mitochondrial outer membrane; CuB binding to MTCH2 disrupts mitochondrial integrity, causes mitochondrial DNA release into the cytosol, and activates the cGAS-STING innate immune pathway, establishing MTCH2 as a node linking mitochondrial function to tumor immunogenicity.","method":"Quantitative Thiol Reactivity Profiling (QTRP), microscale thermophoresis, cellular thermal shift assay, activity-based protein profiling, in vitro/in vivo tumor models, cGAS-STING pathway activation assays","journal":"Phytomedicine : international journal of phytotherapy and phytopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct covalent binding confirmed by multiple biophysical methods with functional downstream pathway readouts; single lab","pmids":["40582210"],"is_preprint":false},{"year":2026,"finding":"MTCH2 interacts with SENP1 (Sentrin-specific protease 1) as shown by co-immunoprecipitation; MIc (Momordin Ic) reduces SENP1 levels in M1 macrophages via an NFκB-dependent mechanism, thereby activating MTCH2 and rescuing mitochondrial dysfunction to suppress colitis-associated colorectal cancer.","method":"Co-immunoprecipitation (SENP1-MTCH2 interaction), proteomics, MTCH2 knockdown/overexpression, macrophage polarization assays, mitochondrial function assays (Mito-tracker, JC-1, DCFH-DA), NF-κB inhibitor epistasis","journal":"Phytotherapy research : PTR","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP identifying SENP1-MTCH2 interaction; mechanistic pathway partially characterized; single lab, single method for interaction","pmids":["42007543"],"is_preprint":false}],"current_model":"MTCH2 is a modified mitochondrial carrier protein resident in the outer mitochondrial membrane that serves as (1) a protein insertase mediating insertion of α-helical (tail-anchored, signal-anchored, and multipass) proteins into the outer membrane via membrane-embedded hydrophilic residues evolved from a solute carrier scaffold; (2) a facilitator of tBID recruitment to mitochondria—acting redundantly with cardiolipin—to promote BAX/BAK oligomerization, apoptotic pore growth, and MOMP downstream of BID and upstream of caspase activation; (3) a scaffold cooperating with MARCH5/UBE2K for proteasomal degradation of the MCL1:NOXA complex; (4) a regulator of mitochondrial fusion (via LPA-dependent mechanism) controlling mitochondrial elongation, OXPHOS, and cellular fate decisions including stem cell pluripotency transitions and HSC homeostasis; (5) a negative regulator of fatty acid oxidation through direct physical interaction with CPT1 modulating malonyl-CoA sensitivity; and (6) a copper-binding outer membrane protein that coordinates mitochondrial copper distribution, morphology, and dynamics."},"narrative":{"mechanistic_narrative":"MTCH2 is a modified mitochondrial carrier residing in the outer mitochondrial membrane that couples membrane protein biogenesis, apoptotic commitment, and mitochondrial dynamics to cellular metabolic and fate decisions [PMID:20436477, PMID:36264797]. Mechanistically, it functions as a protein insertase: purified MTCH2 is sufficient to insert biophysically diverse tail-anchored, signal-anchored, and multipass α-helical proteins—but not β-barrels—into the outer membrane, using membrane-embedded hydrophilic residues derived from a solute-carrier scaffold to act as a gatekeeper against mislocalization to the ER [PMID:36264797]. In apoptosis, MTCH2 facilitates recruitment of tBID to mitochondria, acting redundantly with cardiolipin, to drive Bax/Bak activation, MOMP, and downstream caspase-dependent death; the tBID interaction is mediated by two mapped binding interfaces [PMID:20436477, PMID:22416135, PMID:26794447]. It localizes near BAX/BAK assemblies under apoptotic conditions and accelerates their oligomerization in an LPA-dependent manner, linking pore assembly to sublethal permeabilization, mtDNA release, and cGAS-STING activation [PMID:42056306]. MTCH2 also regulates mitochondrial fusion and elongation—governing OXPHOS, naïve-to-primed pluripotency transitions, and hematopoietic stem cell quiescence—through an LPA-dependent mechanism downstream of BID [PMID:26219591, PMID:30510213, PMID:34586346]. Beyond these core roles, MTCH2 negatively regulates fatty acid oxidation by directly binding CPT1 and tuning its malonyl-CoA sensitivity, suppresses adipose thermogenesis, and scaffolds MARCH5/UBE2K-mediated proteasomal degradation of the MCL1:NOXA complex [PMID:32094511, PMID:41044057, PMID:40051328].","teleology":[{"year":2002,"claim":"Established MTCH2 as a mitochondrial protein responsive to growth-factor signaling, the first functional handle on an uncharacterized carrier.","evidence":"Differential display cloning downstream of Met-HGF/SF signaling, subcellular fractionation, and membrane potential measurement","pmids":["12407445"],"confidence":"Medium","gaps":["Mechanism of membrane potential reduction undefined","Link to Met signaling correlative at this stage"]},{"year":2006,"claim":"Showed MTCH2 selectively modulates Met downstream signaling, narrowing its effect to the Shc/Grb2/SRE branch while sparing PI3K.","evidence":"Ectopic expression with signaling readouts, SRE-luciferase reporter, and in vivo tumor growth assay","pmids":["16951184"],"confidence":"Medium","gaps":["No direct mechanism linking mitochondrial MTCH2 to cytosolic Shc levels","Single lab"]},{"year":2010,"claim":"Identified MTCH2's first defined molecular role—facilitating tBID recruitment to mitochondria—placing it as a critical node in death-receptor apoptosis.","evidence":"Conditional and cell-type-specific knockouts with tBID recruitment, Bax/Bak activation, MOMP, and apoptosis readouts","pmids":["20436477"],"confidence":"High","gaps":["Whether MTCH2 is a direct tBID receptor or accessory factor unresolved here","No structural detail of the interaction"]},{"year":2012,"claim":"Mapped the physical tBID-MTCH2 interface to two discrete binding-site pairs, providing molecular resolution to the recruitment step.","evidence":"Peptide array screening with biochemical and biophysical binding characterization","pmids":["22416135"],"confidence":"Medium","gaps":["No crystal or cryo-EM structure","Functional consequence of each site not separated"]},{"year":2016,"claim":"Resolved why single MTCH2 loss can be tolerated for tBID recruitment—cardiolipin acts as a redundant receptor.","evidence":"Combined CRISPR cardiolipin synthase knockout and MTCH2 knockdown with tBID recruitment and TRAIL apoptosis assays in HCT116","pmids":["26794447"],"confidence":"Medium","gaps":["Relative contribution of each receptor in different cell types unknown","Single lab epistasis"]},{"year":2015,"claim":"Extended MTCH2 beyond apoptosis to metabolic control, showing it negatively regulates OXPHOS downstream of BID to maintain HSC quiescence.","evidence":"Hematopoietic conditional knockout with OXPHOS, ATP, ROS, mitochondrial size, and cell cycle readouts; BID epistasis","pmids":["26219591"],"confidence":"High","gaps":["Molecular mechanism connecting MTCH2 to OXPHOS not defined","Whether effect is via fusion or direct ETC modulation unclear"]},{"year":2018,"claim":"Defined MTCH2 as a regulator of mitochondrial fusion required for pluripotency state transitions, linking morphology to cell fate.","evidence":"ESC knockout with mitochondrial imaging, metabolic profiling, and MFN2/DN-DRP1 epistasis rescue","pmids":["30510213"],"confidence":"High","gaps":["Direct molecular driver of fusion by MTCH2 not identified here","Connection to insertase/apoptotic roles unresolved"]},{"year":2021,"claim":"Identified the bioactive lipid LPA as the mediator of MTCH2-driven starvation-induced hyperfusion, mechanistically connecting lipogenesis flux to mitochondrial elongation.","evidence":"Loss/gain-of-function with LPA supplementation/depletion and mitochondrial morphology and energetics readouts","pmids":["34586346"],"confidence":"Medium","gaps":["How MTCH2 senses or routes LPA undefined","Single lab"]},{"year":2020,"claim":"Revealed a scaffolding role in protein quality control: MTCH2 cooperates with MARCH5/UBE2K to degrade the NOXA-engaged MCL1 complex.","evidence":"Genome-wide CRISPR screen, Co-IP, proteasomal degradation assays, and MCL1 domain/lysine mutant analysis","pmids":["32094511"],"confidence":"High","gaps":["Structural basis of complex assembly unknown","Whether this depends on insertase activity untested"]},{"year":2022,"claim":"Established the unifying biochemical activity—MTCH2 is a bona fide outer membrane protein insertase for α-helical proteins, recasting earlier phenotypes as consequences of impaired membrane protein biogenesis.","evidence":"Genome-wide CRISPR screens plus reconstitution of purified MTCH2 in proteoliposomes with mutational and localization analysis","pmids":["36264797"],"confidence":"High","gaps":["Full client repertoire not enumerated","How insertase activity intersects apoptotic and fusion roles not directly tested"]},{"year":2026,"claim":"Connected MTCH2 directly to BAX/BAK pore assembly and innate immune signaling, showing it accelerates oligomerization via LPA and gates mtDNA-driven cGAS-STING activation.","evidence":"In situ proximity labeling, single-particle BAX/BAK oligomerization imaging, knockout cells, LPA rescue, and bacterial infection/cGAS-STING readouts","pmids":["42056306"],"confidence":"High","gaps":["How LPA mechanistically promotes oligomerization unresolved","Whether insertase residues mediate this effect untested"]},{"year":2025,"claim":"Defined MTCH2 as a direct CPT1 partner and brake on fatty acid oxidation and thermogenesis, expanding its metabolic regulatory portfolio in adipose tissue.","evidence":"Adipocyte-specific knockouts with CPT1 co-IP, malonyl-CoA sensitivity assays, metabolic cage, and omics; separate adipose KO linking thermogenesis suppression to Bcl-2-dependent autophagy","pmids":["41044057","40051328"],"confidence":"Medium","gaps":["Whether CPT1 binding and thermogenesis pathways are mechanistically linked unclear","Bcl-2-autophagy link relies on integrated analysis, not direct reconstitution"]},{"year":2025,"claim":"Implicated MTCH2 in additional partner interactions (SelH, copper binding) and disease contexts (ferroptosis in colorectal cancer, tumor immunogenicity), broadening its mitochondrial regulatory network.","evidence":"Co-IP/MS with SelH, copper-binding characterization, E2F4 ubiquitination and TFRC ChIP, and covalent CuB targeting with cGAS-STING readouts","pmids":["41314281","40600459","40582210"],"confidence":"Medium","gaps":["These roles are individually single-lab","Copper-binding role is from a preprint","Mechanistic integration with core insertase/apoptotic functions undefined"]},{"year":null,"claim":"How a single insertase scaffold integrates protein biogenesis, apoptotic pore assembly, LPA-dependent fusion, and lipid/metabolic regulation into one coherent mechanism remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of MTCH2 with a client or with tBID/BAX","Whether scramblase activity is real (computational only)","Causal hierarchy among insertase, fusion, and apoptotic roles untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[7]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,0]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,19]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,14,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19,20]}],"complexes":["MARCH5/UBE2K/MTCH2 MCL1-degradation complex"],"partners":["BID","BAX","BAK","CPT1","MARCH5","UBE2K","SELENOH","SENP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6C9","full_name":"Mitochondrial carrier homolog 2","aliases":["Met-induced mitochondrial protein"],"length_aa":303,"mass_kda":33.3,"function":"Protein insertase that mediates insertion of transmembrane proteins into the mitochondrial outer membrane (PubMed:36264797). Catalyzes insertion of proteins with alpha-helical transmembrane regions, such as signal-anchored, tail-anchored and multi-pass membrane proteins (PubMed:36264797). Does not mediate insertion of beta-barrel transmembrane proteins (PubMed:36264797). Also acts as a receptor for the truncated form of pro-apoptotic BH3-interacting domain death agonist (p15 BID) and has therefore a critical function in apoptosis (By similarity). Regulates the quiescence/cycling of hematopoietic stem cells (HSCs) (By similarity). Acts as a regulator of mitochondrial fusion, essential for the naive-to-primed interconversion of embryonic stem cells (ESCs) (By similarity). Acts as a regulator of lipid homeostasis and has a regulatory role in adipocyte differentiation and biology (By similarity)","subcellular_location":"Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y6C9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MTCH2","classification":"Not Classified","n_dependent_lines":165,"n_total_lines":1208,"dependency_fraction":0.13658940397350994},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DNAJC11","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MTCH2","total_profiled":1310},"omim":[{"mim_id":"613221","title":"MITOCHONDRIAL CARRIER HOMOLOG 2; MTCH2","url":"https://www.omim.org/entry/613221"},{"mim_id":"601665","title":"OBESITY","url":"https://www.omim.org/entry/601665"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MTCH2"},"hgnc":{"alias_symbol":["SLC25A50","MIMP"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6C9","domains":[{"cath_id":"1.50.40.10","chopping":"2-96_129-294","consensus_level":"medium","plddt":89.3542,"start":2,"end":294}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6C9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6C9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6C9-F1-predicted_aligned_error_v6.png","plddt_mean":86.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MTCH2","jax_strain_url":"https://www.jax.org/strain/search?query=MTCH2"},"sequence":{"accession":"Q9Y6C9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6C9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6C9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6C9"}},"corpus_meta":[{"pmid":"26219591","id":"PMC_26219591","title":"An MTCH2 pathway repressing mitochondria metabolism regulates haematopoietic stem cell fate.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/26219591","citation_count":206,"is_preprint":false},{"pmid":"20436477","id":"PMC_20436477","title":"MTCH2/MIMP is a major facilitator of tBID recruitment to mitochondria.","date":"2010","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/20436477","citation_count":183,"is_preprint":false},{"pmid":"36264797","id":"PMC_36264797","title":"MTCH2 is a mitochondrial outer membrane protein insertase.","date":"2022","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/36264797","citation_count":127,"is_preprint":false},{"pmid":"30339471","id":"PMC_30339471","title":"MTCH2 promotes adipogenesis in intramuscular preadipocytes via an m6A-YTHDF1-dependent mechanism.","date":"2018","source":"FASEB journal : official publication of the Federation of American Societies for Experimental 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facilitates recruitment of tBID to mitochondria; knockout in embryonic stem cells, mouse embryonic fibroblasts, and conditional knockout in liver hindered tBID recruitment, Bax/Bak activation, MOMP, and apoptosis, establishing MTCH2 as a critical facilitator of the Fas/death-receptor apoptotic pathway.\",\n      \"method\": \"Conditional knockout mice (liver-specific), embryonic stem cell and MEF knockout, in vivo and in vitro tBID recruitment assays, MOMP measurement, apoptosis assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal loss-of-function in multiple cell types and in vivo model, multiple orthogonal readouts (tBID recruitment, Bax/Bak activation, MOMP, apoptosis), replicated across tissues\",\n      \"pmids\": [\"20436477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The molecular interaction between tBID and MTCH2 was mapped to two specific binding sites: tBID residues 59–73 binding MTCH2 residues 140–161, and tBID residues 111–125 binding MTCH2 residues 240–290, as determined by peptide array screening combined with biochemical and biophysical characterization.\",\n      \"method\": \"Peptide array screening, biochemical binding assays, biophysical techniques (characterizing tBID–MTCH2 interaction at structural/molecular level)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (peptide arrays, biochemical, biophysical) in single lab; binding sites precisely mapped but no crystal/cryo-EM structure\",\n      \"pmids\": [\"22416135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MTCH2 acts as a negative regulator of mitochondrial OXPHOS downstream of BID in haematopoietic stem cells (HSCs); loss of MTCH2 increases mitochondrial OXPHOS, mitochondrial size, ATP and ROS levels, and triggers HSC and progenitor entry into cell cycle, demonstrating MTCH2 is indispensable for HSC homeostasis.\",\n      \"method\": \"Conditional knockout mice (MTCH2 deletion in haematopoietic system), measurement of OXPHOS, ATP, ROS, mitochondrial size, cell cycle analysis, irradiation-induced apoptosis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with multiple orthogonal metabolic and functional readouts; epistasis with BID phosphorylation-deficient mutant places MTCH2 downstream of BID\",\n      \"pmids\": [\"26219591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Both cardiolipin (CL) and MTCH2 can serve as redundant receptors for tBID at the mitochondrial outer membrane; depletion of either alone did not block tBID recruitment in HCT116 cells, but combined depletion of both CL and MTCH2 significantly reduced tBID recruitment, indicating functional redundancy.\",\n      \"method\": \"CRISPR/homologous recombination knockout of cardiolipin synthase in HCT116 cells, siRNA knockdown of MTCH2, tBID recruitment assay, TRAIL-induced apoptosis assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic double-depletion epistasis experiment with direct tBID recruitment readout, single lab but orthogonal genetic tools\",\n      \"pmids\": [\"26794447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MTCH2 is a regulator of mitochondrial fusion required for naïve-to-primed pluripotency interconversion in murine ESCs; MTCH2-/- ESCs fail to elongate mitochondria and alter metabolism, and enforced mitochondrial elongation via MFN2 overexpression or dominant-negative DRP1 rescues exit from naïve pluripotency in MTCH2-/- ESCs.\",\n      \"method\": \"MTCH2 knockout ESCs, live mitochondrial imaging, metabolic profiling (glutamine utilization), histone acetylation measurement, epistasis rescue with MFN2 overexpression and DN-DRP1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis rescue (MFN2/DN-DRP1 rescue of MTCH2 KO phenotype) with multiple orthogonal readouts (mitochondrial morphology, metabolism, pluripotency markers, histone acetylation), single lab but rigorous\",\n      \"pmids\": [\"30510213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MTCH2 cooperates with the E3 ubiquitin ligase MARCH5 and E2 conjugating enzyme UBE2K to mediate proteasomal degradation of MCL1 specifically when MCL1 is engaged by NOXA; this requires the MCL1 transmembrane domain and specific MCL1 lysine residues, placing MTCH2 as an essential component of a complex that marks the MCL1:NOXA complex for degradation.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, genetic validation, co-immunoprecipitation, proteasomal degradation assays, domain/mutant analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased genome-wide CRISPR screen identification followed by mechanistic validation with Co-IP and mutant analysis; MARCH5/UBE2K/MTCH2 complex precisely defined\",\n      \"pmids\": [\"32094511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTCH2 is a selective effector of starvation-induced mitochondrial hyperfusion (a cytoprotective response to nutrient deprivation) that stimulates mitochondrial fusion in a manner dependent on the bioactive lipogenesis intermediate lysophosphatidic acid (LPA), linking flux through the lipogenesis pathway to mitochondrial elongation and enhanced energy production.\",\n      \"method\": \"MTCH2 loss-of-function and gain-of-function in cell culture, starvation-induced hyperfusion assays, LPA supplementation/depletion, mitochondrial morphology imaging, energy production measurements\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional loss/gain-of-function with LPA epistasis, multiple readouts; single lab study\",\n      \"pmids\": [\"34586346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MTCH2 is a mitochondrial outer membrane protein insertase required for insertion of biophysically diverse tail-anchored (TA), signal-anchored, and multipass α-helical proteins into the outer mitochondrial membrane but not β-barrel proteins; purified MTCH2 was sufficient to mediate insertion into reconstituted proteoliposomes; MTCH2 uses membrane-embedded hydrophilic residues (evolved from a solute carrier transporter) to act as a gatekeeper controlling mislocalization of TAs to the ER and modulating apoptosis sensitivity.\",\n      \"method\": \"Genome-wide CRISPR screens, purified protein reconstitution into proteoliposomes, functional and mutational studies, subcellular localization assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with purified protein in proteoliposomes, genome-wide CRISPR identification, mutational analysis; multiple orthogonal methods in single study\",\n      \"pmids\": [\"36264797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MIMP/MTCH2 is induced by Met-HGF/SF signal transduction and localizes to mitochondria; ectopic MTCH2 expression reduces mitochondrial membrane potential (uncoupling activity) in a level-dependent manner, linking Met tyrosine kinase signaling to mitochondrial depolarization.\",\n      \"method\": \"Differential display PCR cloning, Northern and Western blot, immunostaining of HA-tagged and GFP-fusion MTCH2, subcellular fractionation, mitochondrial membrane potential measurement\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization confirmed by multiple methods (immunostaining, GFP fusion, fractionation) with functional membrane potential readout; single lab\",\n      \"pmids\": [\"12407445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MTCH2/MIMP overexpression attenuates HGF/SF-induced cellular scattering and tumor growth by reducing Shc levels, preventing HGF/SF-induced tyrosine phosphorylation of Grb2 and Shc, and suppressing SRE-dependent transcription, while leaving PI3K signaling unaffected; this defines MTCH2 as a selective modulator of Met downstream signaling.\",\n      \"method\": \"Ectopic MTCH2 expression in cancer cells, HGF/SF stimulation, Western blotting for Met, Shc, Grb2, PI3K phosphorylation, SRE-luciferase reporter assay, in vivo tumor growth assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple signaling readouts with functional in vivo rescue; single lab\",\n      \"pmids\": [\"16951184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Deletion of forebrain MTCH2 impairs mitochondria motility and calcium handling in hippocampal neurons, leading to deficits in spatial memory, long-term potentiation (LTP), and spontaneous excitatory synaptic currents, establishing MTCH2 as a critical regulator of neuronal mitochondria function required for hippocampus-dependent cognition.\",\n      \"method\": \"Forebrain-specific conditional MTCH2 knockout mice, live mitochondria motility imaging, calcium buffering assays, LTP electrophysiology, behavioral memory tests\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo conditional KO with direct mitochondria motility and calcium imaging plus electrophysiological and behavioral phenotypes; single lab\",\n      \"pmids\": [\"28276496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MTCH2 is a conserved regulator of lipid homeostasis; its knockdown reduced lipid accumulation in adipocyte-like cells and in C. elegans and mice in vivo, while overexpression increased fat accumulation across species; MTCH2 influences lipid homeostasis partly through modulation of estrogen receptor 1 (ESR1) activity.\",\n      \"method\": \"RNAi knockdown and genetic mutant in C. elegans, shRNA knockdown and overexpression in cells and mice, lipid accumulation assays, ESR1 activity measurement\",\n      \"journal\": \"Obesity (Silver Spring, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conserved across three model systems with gain- and loss-of-function; ESR1 link is correlative rather than mechanistically dissected\",\n      \"pmids\": [\"28127879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Stop codon read-through of MTCH2 mRNA generates two longer isoforms (MTCH2x and MTCH2xx); MTCH2xx is predominantly cytoplasmic (unlike mitochondrially-localized MTCH2 and MTCH2x) and rapidly degraded (t1/2 <1 h); CRISPR-generated read-through-deficient cells show increased MTCH2 expression and decreased mitochondrial membrane potential, demonstrating that double stop codon read-through regulates MTCH2 protein levels and mitochondrial membrane potential.\",\n      \"method\": \"Luminescence- and fluorescence-based read-through assays, ribosome profiling and mass spectrometry data analysis, CRISPR-Cas9 read-through-deficient cell generation, subcellular fractionation, mitochondrial membrane potential assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assays, ribosome profiling, MS, CRISPR KO) establishing novel regulatory mechanism; single lab\",\n      \"pmids\": [\"33028634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Molecular dynamics simulations (coarse-grained and atomistic) demonstrate that MTCH2's membrane-spanning hydrophilic groove significantly reduces the free energy barrier for lipid movement across the membrane, enabling it to function as a lipid scramblase with a rate comparable to VDAC in the outer mitochondrial membrane.\",\n      \"method\": \"Coarse-grained and atomistic molecular dynamics simulations, free energy barrier calculations for lipid flip-flop\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational simulation only; no direct in vitro scramblase activity measurement\",\n      \"pmids\": [\"38377988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MTCH2 directly interacts with carnitine palmitoyltransferase 1 (CPT1) and modulates CPT1 sensitivity to malonyl-CoA inhibition, thereby regulating mitochondrial influx of free fatty acids and energy expenditure in adipocytes; adipocyte-specific ablation of MTCH2 improves mitochondrial function and whole-body energy expenditure independent of UCP1.\",\n      \"method\": \"Adipocyte-specific MTCH2 knockout mice, direct physical interaction assay (co-immunoprecipitation/pull-down), CPT1 activity and malonyl-CoA sensitivity assay, metabolic cage measurements, proteomic and RNA sequencing analyses\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct physical interaction with CPT1 demonstrated, in vivo KO with metabolic phenotype; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"41044057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MTCH2 deficiency promotes ubiquitin-proteasome-dependent degradation of E2F4, relieving E2F4-mediated transcriptional repression of transferrin receptor (TFRC) and thereby facilitating TFRC-mediated ferroptosis in colorectal cancer cells.\",\n      \"method\": \"MTCH2 conditional knockout mice, in vitro KO/OE in CRC cell lines, proteasomal ubiquitination assays for E2F4, chromatin immunoprecipitation for TFRC promoter, ferroptosis markers (ferrous ion, lipid ROS)\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO + in vitro mechanistic dissection of E2F4 ubiquitination and TFRC transcription; single lab\",\n      \"pmids\": [\"40600459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MTCH2 suppresses thermogenesis in brown and subcutaneous white adipose tissue by negatively regulating autophagy through a Bcl-2-dependent mechanism; adipose-specific MTCH2 depletion stimulates thermogenesis, upregulates UCP1, enhances mitochondrial biogenesis, and increases lipolysis.\",\n      \"method\": \"Adipose-specific MTCH2 knockout mice, high-fat diet model, RNA sequencing + proteomics, Bcl-2 pathway epistasis, UCP1 and mitochondrial biogenesis measurements\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo adipose-specific KO with integrated omics and Bcl-2 epistasis; Bcl-2 mechanistic link relies on integrated analysis rather than direct biochemical reconstitution\",\n      \"pmids\": [\"40051328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Selenoprotein H (SelH) interacts directly with MTCH2 (identified by Co-IP combined with mass spectrometry and molecular docking), and SelH targets MTCH2 to regulate mitofusin 2 (MFN2)-dependent mitochondrial fusion and quality control, thereby alleviating oxidative stress and apoptosis in acute kidney injury.\",\n      \"method\": \"Co-immunoprecipitation with mass spectrometry, laser confocal co-localization, molecular docking, SelH/MTCH2 knockdown and overexpression in HEK293t cells and SelH KO mice, mitochondrial dynamics and MFN2 assays\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP + MS identification of MTCH2 as SelH interactor, in vivo KO validation, MFN2 epistasis; single lab\",\n      \"pmids\": [\"41314281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MTCH2 directly binds copper and functions as a copper-binding regulator that coordinates mitochondrial copper distribution and morphology; skeletal muscle-specific deletion of copper importer Ctr1 causes copper deficiency, mitochondrial hyperfusion, and myopathic features that are mechanistically linked to MTCH2, and copper restoration rescues mitochondrial function.\",\n      \"method\": \"Skeletal muscle-specific Ctr1 knockout mice, MTCH2 copper-binding characterization, AAV-mediated Ctr1 re-expression rescue, copper ionophore treatment, electron transport chain proteomics, mitochondrial morphology imaging\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with copper-binding characterization and rescue; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"41332672\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MTCH2 localizes near BAX and BAK assemblies specifically under apoptotic conditions (mapped by in situ proximity labeling); cells lacking MTCH2 exhibit delayed BAX and BAK oligomerization at the single-particle level, which is rescued by addition of lysophosphatidic acid (LPA); MTCH2 depletion decreases apoptosis sensitivity, sublethal mitochondrial permeabilization during bacterial infection, mitochondrial DNA release, and cGAS-STING activation.\",\n      \"method\": \"In situ proximity labeling (BioID/APEX), single-particle BAX/BAK oligomerization imaging, MTCH2 knockout cells, LPA rescue experiments, apoptosis assays, bacterial infection model, mtDNA release and cGAS-STING activation measurement\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proximity labeling, single-particle imaging, genetic KO, LPA epistasis, downstream pathway readouts); rigorous mechanistic dissection of MTCH2's role in BAX/BAK pore assembly\",\n      \"pmids\": [\"42056306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CuB (Cucurbitacin B) covalently targets MTCH2 at the mitochondrial outer membrane; CuB binding to MTCH2 disrupts mitochondrial integrity, causes mitochondrial DNA release into the cytosol, and activates the cGAS-STING innate immune pathway, establishing MTCH2 as a node linking mitochondrial function to tumor immunogenicity.\",\n      \"method\": \"Quantitative Thiol Reactivity Profiling (QTRP), microscale thermophoresis, cellular thermal shift assay, activity-based protein profiling, in vitro/in vivo tumor models, cGAS-STING pathway activation assays\",\n      \"journal\": \"Phytomedicine : international journal of phytotherapy and phytopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct covalent binding confirmed by multiple biophysical methods with functional downstream pathway readouts; single lab\",\n      \"pmids\": [\"40582210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MTCH2 interacts with SENP1 (Sentrin-specific protease 1) as shown by co-immunoprecipitation; MIc (Momordin Ic) reduces SENP1 levels in M1 macrophages via an NFκB-dependent mechanism, thereby activating MTCH2 and rescuing mitochondrial dysfunction to suppress colitis-associated colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation (SENP1-MTCH2 interaction), proteomics, MTCH2 knockdown/overexpression, macrophage polarization assays, mitochondrial function assays (Mito-tracker, JC-1, DCFH-DA), NF-κB inhibitor epistasis\",\n      \"journal\": \"Phytotherapy research : PTR\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP identifying SENP1-MTCH2 interaction; mechanistic pathway partially characterized; single lab, single method for interaction\",\n      \"pmids\": [\"42007543\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MTCH2 is a modified mitochondrial carrier protein resident in the outer mitochondrial membrane that serves as (1) a protein insertase mediating insertion of α-helical (tail-anchored, signal-anchored, and multipass) proteins into the outer membrane via membrane-embedded hydrophilic residues evolved from a solute carrier scaffold; (2) a facilitator of tBID recruitment to mitochondria—acting redundantly with cardiolipin—to promote BAX/BAK oligomerization, apoptotic pore growth, and MOMP downstream of BID and upstream of caspase activation; (3) a scaffold cooperating with MARCH5/UBE2K for proteasomal degradation of the MCL1:NOXA complex; (4) a regulator of mitochondrial fusion (via LPA-dependent mechanism) controlling mitochondrial elongation, OXPHOS, and cellular fate decisions including stem cell pluripotency transitions and HSC homeostasis; (5) a negative regulator of fatty acid oxidation through direct physical interaction with CPT1 modulating malonyl-CoA sensitivity; and (6) a copper-binding outer membrane protein that coordinates mitochondrial copper distribution, morphology, and dynamics.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MTCH2 is a modified mitochondrial carrier residing in the outer mitochondrial membrane that couples membrane protein biogenesis, apoptotic commitment, and mitochondrial dynamics to cellular metabolic and fate decisions [#0, #7]. Mechanistically, it functions as a protein insertase: purified MTCH2 is sufficient to insert biophysically diverse tail-anchored, signal-anchored, and multipass α-helical proteins—but not β-barrels—into the outer membrane, using membrane-embedded hydrophilic residues derived from a solute-carrier scaffold to act as a gatekeeper against mislocalization to the ER [#7]. In apoptosis, MTCH2 facilitates recruitment of tBID to mitochondria, acting redundantly with cardiolipin, to drive Bax/Bak activation, MOMP, and downstream caspase-dependent death; the tBID interaction is mediated by two mapped binding interfaces [#0, #1, #3]. It localizes near BAX/BAK assemblies under apoptotic conditions and accelerates their oligomerization in an LPA-dependent manner, linking pore assembly to sublethal permeabilization, mtDNA release, and cGAS-STING activation [#19]. MTCH2 also regulates mitochondrial fusion and elongation—governing OXPHOS, naïve-to-primed pluripotency transitions, and hematopoietic stem cell quiescence—through an LPA-dependent mechanism downstream of BID [#2, #4, #6]. Beyond these core roles, MTCH2 negatively regulates fatty acid oxidation by directly binding CPT1 and tuning its malonyl-CoA sensitivity, suppresses adipose thermogenesis, and scaffolds MARCH5/UBE2K-mediated proteasomal degradation of the MCL1:NOXA complex [#5, #14, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established MTCH2 as a mitochondrial protein responsive to growth-factor signaling, the first functional handle on an uncharacterized carrier.\",\n      \"evidence\": \"Differential display cloning downstream of Met-HGF/SF signaling, subcellular fractionation, and membrane potential measurement\",\n      \"pmids\": [\"12407445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of membrane potential reduction undefined\", \"Link to Met signaling correlative at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed MTCH2 selectively modulates Met downstream signaling, narrowing its effect to the Shc/Grb2/SRE branch while sparing PI3K.\",\n      \"evidence\": \"Ectopic expression with signaling readouts, SRE-luciferase reporter, and in vivo tumor growth assay\",\n      \"pmids\": [\"16951184\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct mechanism linking mitochondrial MTCH2 to cytosolic Shc levels\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified MTCH2's first defined molecular role—facilitating tBID recruitment to mitochondria—placing it as a critical node in death-receptor apoptosis.\",\n      \"evidence\": \"Conditional and cell-type-specific knockouts with tBID recruitment, Bax/Bak activation, MOMP, and apoptosis readouts\",\n      \"pmids\": [\"20436477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MTCH2 is a direct tBID receptor or accessory factor unresolved here\", \"No structural detail of the interaction\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Mapped the physical tBID-MTCH2 interface to two discrete binding-site pairs, providing molecular resolution to the recruitment step.\",\n      \"evidence\": \"Peptide array screening with biochemical and biophysical binding characterization\",\n      \"pmids\": [\"22416135\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No crystal or cryo-EM structure\", \"Functional consequence of each site not separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved why single MTCH2 loss can be tolerated for tBID recruitment—cardiolipin acts as a redundant receptor.\",\n      \"evidence\": \"Combined CRISPR cardiolipin synthase knockout and MTCH2 knockdown with tBID recruitment and TRAIL apoptosis assays in HCT116\",\n      \"pmids\": [\"26794447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of each receptor in different cell types unknown\", \"Single lab epistasis\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended MTCH2 beyond apoptosis to metabolic control, showing it negatively regulates OXPHOS downstream of BID to maintain HSC quiescence.\",\n      \"evidence\": \"Hematopoietic conditional knockout with OXPHOS, ATP, ROS, mitochondrial size, and cell cycle readouts; BID epistasis\",\n      \"pmids\": [\"26219591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism connecting MTCH2 to OXPHOS not defined\", \"Whether effect is via fusion or direct ETC modulation unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined MTCH2 as a regulator of mitochondrial fusion required for pluripotency state transitions, linking morphology to cell fate.\",\n      \"evidence\": \"ESC knockout with mitochondrial imaging, metabolic profiling, and MFN2/DN-DRP1 epistasis rescue\",\n      \"pmids\": [\"30510213\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular driver of fusion by MTCH2 not identified here\", \"Connection to insertase/apoptotic roles unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified the bioactive lipid LPA as the mediator of MTCH2-driven starvation-induced hyperfusion, mechanistically connecting lipogenesis flux to mitochondrial elongation.\",\n      \"evidence\": \"Loss/gain-of-function with LPA supplementation/depletion and mitochondrial morphology and energetics readouts\",\n      \"pmids\": [\"34586346\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How MTCH2 senses or routes LPA undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a scaffolding role in protein quality control: MTCH2 cooperates with MARCH5/UBE2K to degrade the NOXA-engaged MCL1 complex.\",\n      \"evidence\": \"Genome-wide CRISPR screen, Co-IP, proteasomal degradation assays, and MCL1 domain/lysine mutant analysis\",\n      \"pmids\": [\"32094511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of complex assembly unknown\", \"Whether this depends on insertase activity untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established the unifying biochemical activity—MTCH2 is a bona fide outer membrane protein insertase for α-helical proteins, recasting earlier phenotypes as consequences of impaired membrane protein biogenesis.\",\n      \"evidence\": \"Genome-wide CRISPR screens plus reconstitution of purified MTCH2 in proteoliposomes with mutational and localization analysis\",\n      \"pmids\": [\"36264797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full client repertoire not enumerated\", \"How insertase activity intersects apoptotic and fusion roles not directly tested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Connected MTCH2 directly to BAX/BAK pore assembly and innate immune signaling, showing it accelerates oligomerization via LPA and gates mtDNA-driven cGAS-STING activation.\",\n      \"evidence\": \"In situ proximity labeling, single-particle BAX/BAK oligomerization imaging, knockout cells, LPA rescue, and bacterial infection/cGAS-STING readouts\",\n      \"pmids\": [\"42056306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LPA mechanistically promotes oligomerization unresolved\", \"Whether insertase residues mediate this effect untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined MTCH2 as a direct CPT1 partner and brake on fatty acid oxidation and thermogenesis, expanding its metabolic regulatory portfolio in adipose tissue.\",\n      \"evidence\": \"Adipocyte-specific knockouts with CPT1 co-IP, malonyl-CoA sensitivity assays, metabolic cage, and omics; separate adipose KO linking thermogenesis suppression to Bcl-2-dependent autophagy\",\n      \"pmids\": [\"41044057\", \"40051328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CPT1 binding and thermogenesis pathways are mechanistically linked unclear\", \"Bcl-2-autophagy link relies on integrated analysis, not direct reconstitution\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated MTCH2 in additional partner interactions (SelH, copper binding) and disease contexts (ferroptosis in colorectal cancer, tumor immunogenicity), broadening its mitochondrial regulatory network.\",\n      \"evidence\": \"Co-IP/MS with SelH, copper-binding characterization, E2F4 ubiquitination and TFRC ChIP, and covalent CuB targeting with cGAS-STING readouts\",\n      \"pmids\": [\"41314281\", \"40600459\", \"40582210\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"These roles are individually single-lab\", \"Copper-binding role is from a preprint\", \"Mechanistic integration with core insertase/apoptotic functions undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single insertase scaffold integrates protein biogenesis, apoptotic pore assembly, LPA-dependent fusion, and lipid/metabolic regulation into one coherent mechanism remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of MTCH2 with a client or with tBID/BAX\", \"Whether scramblase activity is real (computational only)\", \"Causal hierarchy among insertase, fusion, and apoptotic roles untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 19]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 14, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19, 20]}\n    ],\n    \"complexes\": [\"MARCH5/UBE2K/MTCH2 MCL1-degradation complex\"],\n    \"partners\": [\"BID\", \"BAX\", \"BAK\", \"CPT1\", \"MARCH5\", \"UBE2K\", \"SELENOH\", \"SENP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}