{"gene":"MARCHF5","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2006,"finding":"MARCH5 (MARCH-V) is a transmembrane E3 ubiquitin ligase of the mitochondrial outer membrane that binds mitofusin 2 (MFN2) and ubiquitinated forms of Drp1 by co-immunoprecipitation, promotes ubiquitination of Drp1, and overexpression promotes formation of long tubular mitochondria in a MFN2-dependent manner; RING finger mutations cause mitochondrial fragmentation.","method":"Co-immunoprecipitation, overexpression and RING-mutant expression, mitochondrial morphology imaging","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, RING mutant functional analysis, morphology readout; replicated by independent labs","pmids":["16936636"],"is_preprint":false},{"year":2007,"finding":"MARCH5 RING domain activity is required for Drp1-dependent mitochondrial fission; RING mutants cause mitochondrial elongation reversed by ectopic Drp1 but not Fis1; MARCH5 regulates subcellular trafficking of Drp1 (assembly/disassembly at fission sites) as shown by abnormal Drp1 clustering and reduced YFP-Drp1 mobility in MARCH5 RING mutant cells; MARCH5 RING mutants and endogenous Drp1 co-assemble into enlarged clusters in a Drp1 GTPase-dependent manner.","method":"RING domain mutagenesis, RNAi knockdown, FRAP of YFP-Drp1, co-immunoprecipitation, mitochondrial morphology imaging, rescue epistasis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (FRAP, mutagenesis, RNAi, epistasis), replicated across labs","pmids":["17606867"],"is_preprint":false},{"year":2009,"finding":"MITOL/MARCH5 interacts with and ubiquitinates mutant SOD1 (mSOD1) but not wild-type SOD1 in mitochondria; in vitro ubiquitination assay confirmed direct ubiquitination; MITOL overexpression promotes mSOD1 degradation and suppresses mitochondrial mSOD1 accumulation and mSOD1-induced ROS generation; MITOL knockdown or CS-mutant expression increases mSOD1 accumulation, ROS, and cell death.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, cycloheximide-chase, siRNA knockdown, ROS measurement","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination assay plus cellular knockdown/overexpression with defined readouts, single lab but multiple orthogonal methods","pmids":["19741096"],"is_preprint":false},{"year":2010,"finding":"MARCH5 knockdown causes accumulation of elongated, interconnected mitochondria and cellular senescence (SA-β-Gal activity); Mfn1 levels specifically increase in MARCH5-depleted cells identifying Mfn1 as a major ubiquitylation substrate; introduction of GTPase-deficient Mfn1(T109A) abolishes both mitochondrial elongation and senescence; ectopic Drp1 (but not Fis1) rescues mitochondrial morphology and reduces senescence.","method":"shRNA knockdown, RING domain mutant expression, SA-β-Gal assay, rescue epistasis, western blot for substrate levels","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple epistasis experiments, defined substrate (Mfn1), senescence phenotype with mechanistic rescue, replicated by prior literature","pmids":["20103533"],"is_preprint":false},{"year":2010,"finding":"MITOL/MARCH5 promotes degradation of polyglutamine-expanded ataxin-3 (ΔNAT-3Q71) via the ubiquitin-proteasome pathway; MITOL knockdown induces accumulation of detergent-insoluble polyQ aggregates, cytochrome c release, and cell death.","method":"Co-immunoprecipitation, overexpression, siRNA knockdown, cycloheximide chase, cytochrome c release assay","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional knockdown with defined readout, single lab, multiple methods","pmids":["20851218"],"is_preprint":false},{"year":2011,"finding":"MARCH5 positively regulates TLR7 signaling by interacting with TANK and catalyzing K63-linked poly-ubiquitination of TANK at Lys229, 233, 280, 302, and 306, thereby impairing TANK's ability to inhibit TRAF6 and enhancing NF-κB-mediated gene expression; mitochondrial localization of MARCH5 is required for this effect.","method":"Co-immunoprecipitation, in vivo ubiquitination assay with linkage-specific ubiquitin mutants, site-directed mutagenesis, MARCH5 mislocalization construct, NF-κB reporter assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-specific mutagenesis identifying exact ubiquitination sites, linkage-type determination, localization requirement, multiple orthogonal methods in single lab","pmids":["21625535"],"is_preprint":false},{"year":2012,"finding":"MITOL/MARCH5 ubiquitinates S-nitrosylated MAP1B-light chain 1 (LC1); S-nitrosylation of LC1 causes a conformational change that both activates LC1 and promotes its ubiquitination by MITOL, linking microtubule stabilization to MITOL; excessive NO inhibits MITOL, leading to accumulation of S-nitrosylated LC1 and neuronal cell death.","method":"Co-immunoprecipitation, in vitro ubiquitination, MITOL knockdown, NO stimulation, mitochondrial dysfunction readouts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination plus cellular knockdown with mechanistic conformational change analysis, single lab, multiple methods","pmids":["22308378"],"is_preprint":false},{"year":2012,"finding":"Mfn1 is degraded through MARCH5-mediated ubiquitylation specifically in G2/M phase; Mfn1 interacts with cyclin B1 and their interaction is stronger in G2/M phase, suggesting cyclin B1/Cdk1 facilitates MARCH5-mediated Mfn1 degradation during mitotic entry.","method":"Co-immunoprecipitation, western blot for protein levels at cell cycle stages, ubiquitylation assay","journal":"Cell division","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and cell-cycle-synchronized degradation assays with ubiquitylation readout, single lab","pmids":["23253261"],"is_preprint":false},{"year":2013,"finding":"MITOL/MARCH5 regulates MAM (mitochondria-associated ER membrane) domain formation through mitofusin 2 (Mfn2): MITOL interacts with mitochondrial Mfn2 (not ER-associated Mfn2) via MITOL C-terminal domain and Mfn2 HR1 domain; MITOL mediates K63-linked polyubiquitin chain addition to Mfn2 at K192 (identified by mutation analysis) without proteasomal degradation; this K192 ubiquitination activates GTP-dependent Mfn2 oligomerization required for ER-mitochondria tethering.","method":"Co-immunoprecipitation, domain mapping mutagenesis, K63-linkage-specific ubiquitin assay, sucrose-density gradient centrifugation, blue-native PAGE, GTP binding/hydrolysis assay, MITOL knockdown with MAM function readout","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including structural/biochemical assays, specific ubiquitination site identified by mutagenesis, GTP functional assays, single lab with strong evidence","pmids":["23727017"],"is_preprint":false},{"year":2014,"finding":"MARCH5 binds Mfn1 and mediates its ubiquitylation; acetylated Mfn1 (at K491) shows enhanced interaction with MARCH5 and increased ubiquitylation; acetylation-deficient Mfn1(K491R) shows reduced MARCH5 binding and ubiquitylation; MARCH5-knockout MEFs and MARCH5(H43W)-expressing cells undergo rapid cell death under mitochondrial stress, demonstrating that MARCH5-mediated quality control on acetylated Mfn1 is required for cell survival.","method":"Co-immunoprecipitation, ubiquitylation assay, acetylation-deficient and mimetic mutants, MARCH5 knockout MEFs, cell death assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — site-specific mutants identifying acetylation-dependent interaction, MARCH5 KO MEFs, multiple methods, single lab","pmids":["24722297"],"is_preprint":false},{"year":2015,"finding":"MARCH5 controls Drp1-dependent mitochondrial fission and cell sensitivity to stress-induced apoptosis by selectively ubiquitinating and targeting MiD49 (a mitochondrial Drp1 receptor) for proteasomal degradation; MARCH5 knockout causes MiD49 accumulation and mitochondrial fragmentation; MiD49 knockout in MARCH5-/- cells reverses fragmentation and reduces apoptosis sensitivity.","method":"MARCH5 knockout, MiD49 knockout, ubiquitination assay, proteasome inhibitor experiments, mitochondrial morphology imaging, apoptosis assay, rescue epistasis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — double knockout epistasis, ubiquitination assay, multiple orthogonal readouts, single lab with strong controls","pmids":["26564796"],"is_preprint":false},{"year":2015,"finding":"MARCH5 forms homodimers through a GxxxG dimerization motif (first motif critical); dimerization-defective MARCH5(4GL) mutant cannot degrade accumulated inactive MARCH5 mutants, showing that MARCH5 self-clearance via ubiquitin-proteasome pathway requires homodimerization; inactive MARCH5 mutants have ~4-fold longer half-life and accumulation activates NF-κB.","method":"Co-immunoprecipitation, dimerization motif mutagenesis, cycloheximide chase, NF-κB reporter assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutagenesis of dimerization motif, half-life measurements, single lab","pmids":["26476016"],"is_preprint":false},{"year":2015,"finding":"MARCH5 is the mitochondrial E3 ligase that resolves MAVS aggregates during antiviral signaling; MARCH5 binds MAVS only when MAVS forms aggregates during viral stimulation, requiring MARCH5 RING domain and MAVS CARD domain; MARCH5 transfers ubiquitin to MAVS at Lys7 and Lys500 promoting proteasomal degradation; March5+/- mice show elevated type-I interferon responses and reduced viral replication.","method":"Co-immunoprecipitation, in vivo ubiquitination assay with site-specific mutants, March5+/- mouse model, IFN response measurement, viral replication assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific ubiquitination sites identified, in vivo mouse model, multiple orthogonal methods, replicated conceptually","pmids":["26246171"],"is_preprint":false},{"year":2015,"finding":"March5, as a transcriptional target of Klf4, maintains mouse ESC pluripotency by catalyzing K63-linked polyubiquitination of Prkar1a (a negative regulatory subunit of PKA), thereby activating PKA and inhibiting the Raf/MEK/ERK pathway.","method":"March5 knockdown/overexpression in mESCs, K63-ubiquitin assay, PKA activity measurement, ERK pathway readouts, rescue experiments, somatic cell reprogramming","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — linkage-specific ubiquitin assay, PKA activation readout, pathway inhibitor rescue, multiple methods in single lab","pmids":["26033541"],"is_preprint":false},{"year":2016,"finding":"MARCH5 C-terminal domain plays a critical role in degradation of MARCH5 substrates (MiD49 and Mcl1), likely by facilitating release of ubiquitinated proteins from the OMM; Drp1 and Mff negatively regulate MARCH5 activity toward MiD49 and Mcl1, as knockout of either leads to reduced expression and increased ubiquitination of these substrates; Mff is an integral component of the MARCH5/p97/Npl4 degradation complex.","method":"Drp1/Mff knockout cells, double knockout (Drp1-/-/MARCH5-/- and Mff-/-/MARCH5-/-), ubiquitination assays, co-immunoprecipitation, half-life measurements","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — double knockout epistasis, Co-IP of complex components, multiple cell line models, single lab with comprehensive controls","pmids":["27932492"],"is_preprint":false},{"year":2016,"finding":"MARCH5 inhibition abrogates MCL1-dependent resistance to BH3 mimetic ABT-737 through NOXA-dependent regulation of MCL1 ubiquitylation and stability; MARCH5 controls MCL1 ubiquitylation in a NOXA-dependent manner.","method":"Chemical inhibition and genetic knockdown of MARCH5, MCL1 ubiquitylation assay, NOXA-dependency rescue experiments, cancer cell apoptosis assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitylation assay and NOXA-dependency demonstrated, single lab, mechanistic follow-up","pmids":["26910119"],"is_preprint":false},{"year":2017,"finding":"MARCH5 ubiquitylates and degrades FUNDC1 (a mitophagy receptor) specifically in response to hypoxia, targeting K119 of FUNDC1; MARCH5 directly interacts with FUNDC1, and this interaction is enhanced by hypoxic stress; MARCH5-mediated FUNDC1 degradation fine-tunes hypoxia-induced mitophagy; MARCH5 knockdown causes FUNDC1 accumulation and exaggerated mitophagy.","method":"Co-immunoprecipitation, in vivo ubiquitination assay with K119 site-specific mutant, MARCH5 knockdown/overexpression, mitophagy flux measurement","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific ubiquitination site identified by mutagenesis, interaction confirmed by Co-IP, mitophagy functional readout, replicated in companion paper","pmids":["28104734"],"is_preprint":false},{"year":2017,"finding":"PKACs (protein kinase A catalytic subunits) phosphorylate MAVS/VISA at T54, abrogating virus-induced MAVS aggregation and priming it for K48-linked polyubiquitination and proteasomal degradation by MARCH5; phosphorylation at T54 is required for MARCH5-mediated MAVS degradation.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, phosphorylation-site mutant (T54A), PKAC inhibitor H89, antiviral signaling assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mutagenesis, linkage-specific ubiquitin assay, PKAC inhibitor, multiple methods in single lab","pmids":["28934360"],"is_preprint":false},{"year":2019,"finding":"MITOL/MARCH5 ubiquitylates IRE1α at K481 with K63-linked chains at the MAM, preventing IRE1α hyper-oligomerization and RIDD activity; MITOL depletion or IRE1α K481R mutant allows hyper-oligomerization and enhanced RIDD, resulting in apoptosis; in spinal cord of MITOL-deficient mice, ER stress enhances RIDD activity and apoptosis.","method":"Co-immunoprecipitation, K63-linkage ubiquitination assay, K481R site-specific mutant, MITOL knockout cells and mice, RIDD activity assay, IRE1α oligomerization assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — specific ubiquitination site mutagenesis, in vivo mouse model, RIDD functional readout, multiple orthogonal methods, single lab with strong evidence","pmids":["31368599"],"is_preprint":false},{"year":2019,"finding":"MITOL/MARCH5 facilitates initial Parkin recruitment to impaired mitochondria by providing ubiquitin substrate for PINK1-mediated phosphorylation; depletion of MITOL/MARCH5 delays Parkin recruitment and activation on damaged mitochondria.","method":"MITOL/MARCH5 depletion, Parkin recruitment assay, mitochondrial damage model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional depletion with Parkin recruitment readout, mechanistic model proposed with supporting data, single lab","pmids":["31110043"],"is_preprint":false},{"year":2019,"finding":"MARCH5 targets and degrades active RIG-I (but not its inactive phosphomimetic form RIG-IS8E) via K48-linked polyubiquitination at Lys193 and Lys203 of RIG-I; MARCH5 RING domain binds RIG-I CARD domain; co-expression of MARCH5 reduces RIG-I oligomers; dual targeting of RIG-I and MAVS by MARCH5 turns off RLR signaling.","method":"Co-immunoprecipitation, in vivo K48-ubiquitination assay with site-specific mutants, proteasome inhibitor rescue, poly(I:C) stimulation, oligomer analysis","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific ubiquitination sites identified by mutagenesis, linkage-type determined, domain interaction mapped, single lab with multiple methods","pmids":["31881323"],"is_preprint":false},{"year":2019,"finding":"MARCH5 interacts with HBx protein in mitochondria via its N-terminal RING domain, targets HBx for proteasomal degradation, and eliminates HBx protein aggregates; MARCH5 lacking E3 ligase activity (H43W) fails to reduce HBx levels; MARCH5-mediated HBx degradation suppresses HBx-induced ROS, mitophagy, and COX-2 expression.","method":"Co-immunoprecipitation, ubiquitination assay, RING domain mutant (H43W), proteasome inhibitor, semi-denaturing detergent agarose gel for aggregates, ROS measurement","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, E3-dead mutant, aggregate clearance assay with functional readouts, single lab","pmids":["31819032"],"is_preprint":false},{"year":2020,"finding":"MARCH5 is the primary mediator of NOXA-dependent MCL1 degradation in prostate cancer cells; increased NOXA (via kinase inhibitor-induced integrated stress response) drives MARCH5-mediated MCL1 degradation, enhancing apoptosis in response to BH3 mimetics.","method":"MARCH5 genetic manipulation, NOXA overexpression/knockdown, MCL1 ubiquitination and stability assays, apoptosis with BH3 mimetics","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation of pathway components, MCL1 ubiquitination assay, functional apoptosis readout, single lab","pmids":["32484436"],"is_preprint":false},{"year":2020,"finding":"MARCH5, UBE2K (E2), and MTCH2 (outer mitochondrial membrane protein) co-operate to mark MCL1 for proteasomal degradation specifically when MCL1 is bound by NOXA; degradation requires the MCL1 transmembrane domain and specific MCL1 lysine residues; MTCH2 is essential for MARCH5-mediated MCL1:NOXA complex turnover.","method":"Genome-wide CRISPR-Cas9 screen, genetic validation of MARCH5, UBE2K, MTCH2 knockouts, MCL1 ubiquitination and stability assays, NOXA-dependency experiments","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased genome-wide screen plus rigorous genetic validation, multiple components of complex identified, NOXA-dependency demonstrated, single lab with strong evidence","pmids":["32094511"],"is_preprint":false},{"year":2020,"finding":"MARCH5 determines the initial MCL1-NOXA levels upon mitotic entry; MARCH5 knockout paradoxically enhances mitotic apoptosis in a BAK-dependent manner independently of MCL1 and other BH3-only proteins; DRP1 disruption reduces mitotic apoptosis in MARCH5-disrupted cells, linking mitochondrial fission maintenance to the pro-apoptotic role of MARCH5 loss.","method":"MARCH5 knockout, MCL1 knockout, BAK knockout, DRP1 knockout, mitotic apoptosis assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple KO epistasis experiments, defined apoptotic readouts, single lab","pmids":["32015503"],"is_preprint":false},{"year":2020,"finding":"MARCHF5/MARCH5 is degraded by chaperone-mediated autophagy (CMA) via interaction with key CMA regulators (HSPA8, LAMP2A); severe oxidative stress compromises CMA activity, stabilizing MARCHF5, which facilitates DRP1 translocation and excessive mitochondrial fission; increasing CMA activity promotes MARCHF5 turnover, reduces DRP1 translocation, and reduces mitochondrial fragmentation.","method":"CMA substrate identification, Co-IP with CMA regulators, lysosomal degradation assay, MARCHF5 stability measurement, DRP1 translocation assay, mitochondrial morphology imaging, PD rodent model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with CMA machinery, functional manipulation of CMA, DRP1 readout, in vivo PD model, single lab","pmids":["33970775"],"is_preprint":false},{"year":2021,"finding":"MARCH5 localizes to peroxisomes (in addition to mitochondria) via PEX19 binding to its transmembrane region; on peroxisomes, MARCH5 binds and mediates ubiquitination of PMP70; PMP70 ubiquitination and mTOR-inhibition-induced pexophagy are blocked in the absence of MARCH5.","method":"PUP-IT proximity tagging, co-immunoprecipitation, subcellular fractionation and imaging, ubiquitination assay, MARCH5 knockout, pexophagy assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity tagging plus Co-IP, MARCH5 KO functional assay, dual localization confirmed, multiple methods","pmids":["34747980"],"is_preprint":false},{"year":2021,"finding":"MITOL/MARCH5 promotes proteasomal degradation of Parkin by ubiquitinating Parkin at K220, fine-tuning mitophagy; MITOL deletion leads to accumulation of phosphorylated active Parkin in the ER, causing FKBP38 degradation and enhanced cell death; MITOL undergoes FKBP38-dependent translocation from mitochondria to ER during mitophagy.","method":"Co-immunoprecipitation, K220 site-specific ubiquitination assay, MITOL knockout cells, subcellular fractionation imaging, cell death assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific ubiquitination site identified, MITOL KO with functional readouts, subcellular relocalization documented, single lab with multiple methods","pmids":["33565245"],"is_preprint":false},{"year":2021,"finding":"MITOL/MARCH5 ubiquitylates PolγA (mitochondrial DNA polymerase) at K1060 via K6-linked ubiquitin chain; this ubiquitylation negatively regulates PolγA binding to Tom20 and its entry into mitochondria; certain PEO patient PolγA mutants are hyperubiquitylated by MITOL and fail to enter mitochondria, compromising mtDNA replication.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, K6-linkage-specific ubiquitin assay, Tom20 binding assay, mitochondrial import assay, BrdU incorporation into mtDNA","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination assay plus cellular import and mtDNA replication readouts, specific site identified, patient mutant analysis, single lab","pmids":["33657094"],"is_preprint":false},{"year":2021,"finding":"MITOL/MARCH5 cardiac-specific knockout mice develop mitochondrial fragmentation, dysfunction (reduced ATP, increased ROS), myocardial senescence, and chronic heart failure through persistent Drp1 accumulation; AAV-mediated MITOL gene delivery ameliorates cardiac dysfunction after MI.","method":"Cardiomyocyte-specific conditional knockout mice, mitochondrial morphology and function assays, in vivo MI model, AAV gene delivery","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse with cardiac phenotype, AAV rescue, mechanistic link to Drp1, multiple in vivo readouts","pmids":["35789860"],"is_preprint":false},{"year":2021,"finding":"MITOL/MARCH5 knockdown in cardiomyocytes (NRVMs) reduces mitochondria-localized GPX4, decreasing GSH/GSSG ratio and promoting lipid peroxide accumulation leading to ferroptosis; MITOL knockdown increases CHAC1 (GSH-degrading enzyme) expression; cardiac-specific MITOL knockout mice show enhanced susceptibility to doxorubicin-induced ferroptosis.","method":"siRNA knockdown, cardiac-specific MITOL KO mice, GPX4 expression analysis, GSH/GSSG measurement, lipid peroxidation assay, ferroptosis inhibitor (ferrostatin-1) rescue","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cardiac KO mouse, multiple mechanistic readouts, ferroptosis inhibitor rescue, multiple cell and in vivo models","pmids":["34390730"],"is_preprint":false},{"year":2022,"finding":"MARCHF5/MITOL loss drives BAK to adopt an activated conformation independently of BH3-only proteins, forming inhibitory complexes with MCL-1 and BCL-XL, conferring resistance to BH3-mimetic drugs; MARCHF5 restrains BAK activating conformation change.","method":"Genome-wide CRISPR-Cas9 screen, MARCHF5 deletion in multiple cell lines, BAK conformation assay, BH3-mimetic drug response assay, co-immunoprecipitation","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased genome-wide screen, multiple cell lines, BAK conformation functional assay, BH3-only protein independence demonstrated","pmids":["36171332"],"is_preprint":false},{"year":2022,"finding":"MITOL/MARCH5 interacts with and ubiquitinates RMDN3/PTPIP51 at K89, activating its phosphatidic acid (PA)-binding and transfer activity; loss of MITOL or K89R substitution in RMDN3 significantly reduces PA-binding activity at the mitochondria-ER contact site.","method":"APEX2 proximity labeling, co-immunoprecipitation, K89 site-specific ubiquitination assay, PA-binding activity assay, MITOL knockout","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling plus Co-IP, specific ubiquitination site identified, functional PA-binding assay, single lab","pmids":["34964862"],"is_preprint":false},{"year":2022,"finding":"In the context of CMT2A-linked MFN2 R364W mutation, MITOL shows weaker interaction with R364W-MFN2 than wild-type MFN2, making MITOL more available for DRP1 ubiquitylation; this leads to multi-monoubiquitylation and proteasomal degradation of DRP1 resulting in mitochondrial hyperfusion.","method":"Co-immunoprecipitation comparing WT vs R364W MFN2, ubiquitylation assay, DRP1 stability assay, mitochondrial morphology imaging","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comparative Co-IP, ubiquitylation assay, morphology readout, single lab","pmids":["34870686"],"is_preprint":false},{"year":2023,"finding":"MARCH5 interacts with the NACHT domain of NLRP3 and promotes K27-linked polyubiquitination at K324 and K430 of NLRP3; this ubiquitination is required for NLRP3-NEK7 complex formation and NLRP3 oligomerization; myeloid-cell-specific March5 conditional knockout mice fail to secrete IL-1β/IL-18 and show attenuated LPS/P. aeruginosa-induced mortality.","method":"Co-immunoprecipitation, K27-linkage-specific ubiquitination assay, site-specific NLRP3 mutants (K324R, K430R), March5 conditional KO mice, inflammasome activation assays (IL-1β/IL-18), ASC speck formation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific ubiquitination sites identified by mutagenesis, conditional KO mice with in vivo readouts, multiple methods, mechanistic epistasis","pmids":["37575012"],"is_preprint":false},{"year":2023,"finding":"PD-1 ligation induces BATF-dependent transcriptional upregulation of MARCH5, which then mediates K27-linked polyubiquitination and lysosomal degradation of the common cytokine receptor γ chain (γc), impairing γc family cytokine signaling in CD8+ T cells.","method":"PD-1 ligation, BATF knockout, MARCH5 overexpression/knockdown, K27-ubiquitin assay, γc protein stability measurement, cytokine signaling assays","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — linkage-specific ubiquitin assay, BATF KO, PD-1 signaling functional readout, multiple methods in single lab","pmids":["37932447"],"is_preprint":false},{"year":2023,"finding":"MARCH5 ubiquitinates STING to enhance its activation; long-term MARCH5 deficiency leads to ROS production that oxidizes STING at C205, forming inactive STING polymers; MARCH5-mediated ubiquitination of STING prevents oxidation-induced inactive polymer formation.","method":"MARCH5 knockout, STING ubiquitination assay, STING polymer analysis, ROS measurement, cysteine mutant (C205) analysis","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MARCH5 KO, ubiquitination assay, polymer formation analysis, mechanistic oxidation-ubiquitination crosstalk demonstrated, single lab","pmids":["37916870"],"is_preprint":false},{"year":2023,"finding":"MARCH5 binds active DNA-PKcs in cells with mitochondrial DNA double-strand breaks and promotes degradation of DNA-PKcs to reduce type I interferon response; MARCH5 knockout prolongs phospho-HSPA8 levels and mIFNB1 synthesis after LPS stimulation; DNA-PKcs activation is VDAC1-dependent.","method":"Co-immunoprecipitation, MARCH5 KO macrophages, DNA-PKcs stability assay, IFN-β measurement, mtDNA DSB induction system, VDAC1-dependency analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, MARCH5 KO functional readout, VDAC1-dependency, single lab with multiple methods","pmids":["38040710"],"is_preprint":false},{"year":2023,"finding":"MITOL/MARCH5 ubiquitylates RECQL4 at K1101 and K1154 via K6-linked ubiquitin, preventing RECQL4 interaction with Tom20 and its mitochondrial entry; RTS patient RECQL4 mutants are hyperubiquitylated by MITOL and cannot enter mitochondria; MITOL depletion rescues mtDNA replication in some RTS mutant cells; RECQL4 accumulation on mitochondrial outer surface potentiates mitophagy.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, K6-linkage ubiquitin assay, K1101/K1154 site-specific mutants, Tom20 binding assay, mitochondrial import assay, BrdU-mtDNA replication, RTS patient mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination plus cellular functional assays, specific sites identified, patient mutant analysis, multiple methods, single lab","pmids":["37495109"],"is_preprint":false},{"year":2023,"finding":"MARCH5 mediates K48-linked ubiquitination of MIC60 at K285, promoting its degradation; mutation of MIC60 K285 or MARCH5 MIC60-interacting motifs abrogates ubiquitination; TRAP1 inhibits MARCH5-mediated MIC60 ubiquitination by competing with MARCH5 for MIC60 binding.","method":"Co-immunoprecipitation, K48-linkage ubiquitination assay, K285 site-specific mutant, MARCH5 interaction motif mutants, TRAP1 competition assay, MARCH5 silencing","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific ubiquitination site by mutagenesis, K48-linkage confirmed, competition mechanism with TRAP1 demonstrated, multiple methods, single lab","pmids":["37679468"],"is_preprint":false},{"year":2024,"finding":"MARCH5 is essential for de novo peroxisome biogenesis from mitochondria; MARCH5 knockout leads to accumulation of immature peroxisomes and reduced peroxisomal proteins; MARCH5 redistributes to peroxisomes during fatty-acid-induced biogenesis; MARCH5 activity-deficient mutants accumulate on Tom20-positive mitochondria-derived pre-peroxisomes; MARCH5 acts upstream of Pex14 in mitochondrial steps of peroxisome biogenesis.","method":"MARCH5 knockout, double knockout (MARCH5/Pex14, MARCH5/Pex3), subcellular imaging and fractionation, fatty-acid-induced biogenesis assay, MARCH5 activity mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO models, double KO epistasis, MARCH5 activity mutants, functional biogenesis assay, two concurrent independent papers","pmids":["39423819","39423820"],"is_preprint":false},{"year":2024,"finding":"MARCH5 ubiquitinates and degrades MPC1 (mitochondrial pyruvate carrier 1), promoting aerobic glycolysis (Warburg effect) in ovarian cancer cells.","method":"Co-immunoprecipitation, ubiquitination assay, MPC1 stability measurement, MARCH5 knockdown/overexpression, metabolic (OCR/ECAR) assays","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, metabolic functional readout, single lab","pmids":["38615083"],"is_preprint":false},{"year":2024,"finding":"MARCH5 interacts with and ubiquitinates RACGAP1, promoting its degradation; MARCH5-RACGAP1-DRP1 axis controls mitochondrial quality and aortic valve calcification; inhibiting RACGAP1 reverses osteogenic transformation induced by MARCH5 silencing.","method":"Co-immunoprecipitation, mass spectrometry, molecular docking, ubiquitination assay, MARCH5 silencing/overexpression, RACGAP1 knockdown, in vivo aortic valve model","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, in vivo model, epistasis, single lab","pmids":["39880131"],"is_preprint":false},{"year":2025,"finding":"MARCH5 directly interacts with and ubiquitinates Trim28, targeting it for degradation; MARCH5-mediated Trim28 degradation prevents Trim28-mediated Kindlin-2 degradation, elevating MafA and insulin expression in β-cells; Trim28 deletion in β-cells rescues glucose intolerance in March5-deficient mice, establishing a March5/Trim28/Kindlin-2/MafA pathway in β-cell function.","method":"Co-immunoprecipitation, ubiquitination assay, March5 conditional β-cell KO mice, Trim28 β-cell KO mice, insulin expression and glucose tolerance assays, islet transplantation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional KO mouse models, epistasis rescue, multiple mechanistic pathway components identified, Co-IP and ubiquitination assay","pmids":["40750777"],"is_preprint":false},{"year":2025,"finding":"MARCH5 directly interacts with Akt and enhances phosphorylation of Akt, mTOR, and Gsk3β, increasing GATA4 expression and promoting cardiac hypertrophy; MARCH5 heterozygous mice subjected to TAC show attenuated cardiac hypertrophy.","method":"Co-immunoprecipitation, western blot for phosphorylation, MARCH5 overexpression/knockdown, MARCH5+/- mice with TAC model, cardiomyocyte area measurement","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with Akt, phosphorylation readouts, in vivo heterozygous mouse model, single lab","pmids":["40753540"],"is_preprint":false},{"year":2025,"finding":"MARCH5 mediates K27-linked ubiquitination of JEV envelope (E) protein at K136 and K166, enhancing viral attachment; K136R-K166R double mutation attenuates JEV infection in vitro and in vivo; MARCH5 also degrades MAVS via K48-linked ubiquitination at K286, suppressing type I IFN production during JEV infection.","method":"Co-immunoprecipitation, in vivo ubiquitination assay with site-specific mutants, viral attachment assay, JEV replication assay, MARCH5 knockout, IFN measurement, in vivo mouse virulence model","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Moderate — specific ubiquitination sites on viral protein identified by mutagenesis, linkage types determined, in vivo attenuation demonstrated, multiple methods","pmids":["40071916"],"is_preprint":false},{"year":2025,"finding":"MARCH5 directly interacts with MIEF2 (mitochondrial fission factor) to mediate its ubiquitination and proteasomal degradation; MARCH5 overexpression reduces MIEF2 levels and reduces mitochondrial fission and fatty acid synthesis in alcoholic liver disease models; liver-specific MARCH5 knockdown worsens liver injury and abolishes gigantol-mediated protection.","method":"Co-immunoprecipitation, ubiquitination assay, MARCH5/MIEF2 overexpression/knockdown, liver-specific KD mice, mitochondrial dynamics and metabolic assays","journal":"Phytomedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, liver-specific in vivo knockdown model, single lab","pmids":["41353882"],"is_preprint":false},{"year":2026,"finding":"MITOL/MARCH5 ubiquitinates Parkin at K220 downstream of DAPK1-mediated Parkin phosphorylation (at S136 and S198); DAPK1 phosphorylation promotes mitochondrial transport of Parkin, enhancing its interaction with MITOL and leading to Parkin degradation, increasing neuronal vulnerability.","method":"Co-immunoprecipitation, phosphorylation-site mutants (S136A, S198A), ubiquitination assay, MITOL interaction assay, 6-OHDA neurotoxicity model","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-site mutants, Co-IP, ubiquitination assay with functional neuronal readout, single lab","pmids":["41943176"],"is_preprint":false},{"year":2026,"finding":"MARCH5 interacts with peroxisome biogenesis factor Pex26, facilitating transfer of newly synthesized Pex26 from the OMM to peroxisomes in peroxisome-containing cells; in peroxisome-deficient cells, MARCH5 targets Pex26 for p97-dependent proteasomal degradation via ubiquitination; Pex26 knockout causes accumulation of MARCH5/Tom20-positive pre-peroxisomes absent in Pex26/MARCH5 double KO cells.","method":"Co-immunoprecipitation, ubiquitination assay, Pex26 knockout, double knockout (Pex26/MARCH5), subcellular imaging, p97-dependency assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple KO models, Co-IP, ubiquitination assay, but preprint not yet peer-reviewed","pmids":["42182360"],"is_preprint":true}],"current_model":"MARCHF5/MITOL/MARCH5 is an outer mitochondrial membrane-resident RING-type E3 ubiquitin ligase that maintains mitochondrial and cellular homeostasis through ubiquitin-dependent regulation of a broad substrate repertoire: it controls mitochondrial dynamics by ubiquitinating Drp1 (regulating fission complex assembly/disassembly), MiD49 (targeting it for proteasomal degradation to limit fission), and Mfn1/Mfn2 (modulating fusion and ER-mitochondria contacts via K63- or degradative ubiquitination); it governs innate immune signaling by degrading MAVS aggregates and active RIG-I oligomers (K48-linked), activating TANK (K63-linked) to promote TLR7/NF-κB signaling, ubiquitinating NLRP3 (K27-linked at K324/K430) to enable inflammasome assembly, ubiquitinating STING to prevent inactive polymer formation, and degrading DNA-PKcs to limit mtDNA-triggered IFN responses; it regulates apoptosis by controlling MCL1 stability in a NOXA/MTCH2-dependent manner, ubiquitinating MIC60, and restraining BAK activating conformation changes; it mediates mitophagy and quality control through FUNDC1 degradation (K119), Parkin ubiquitination (K220), and facilitating Parkin recruitment via initial substrate ubiquitination for PINK1; it controls ER stress responses by K63-ubiquitinating IRE1α at K481 to prevent hyper-oligomerization; it supports peroxisome de novo biogenesis by transferring peroxins (Pex26, PMP70) from mitochondria-derived pre-peroxisomes; and it ubiquitinates additional substrates including mutant SOD1, polyQ-expanded ataxin-3, LC1, PolγA, RECQL4, Prkar1a, RMDN3, Trim28, MIEF2, MPC1, and RACGAP1 to regulate mitochondrial protein quality control, metabolism, and various cellular processes."},"narrative":{"mechanistic_narrative":"MARCHF5 (MITOL/MARCH5) is a RING-type E3 ubiquitin ligase anchored in the mitochondrial outer membrane that maintains mitochondrial and cellular homeostasis by ubiquitinating a broad substrate repertoire [PMID:16936636, PMID:17606867]. Its central role is controlling mitochondrial dynamics: it ubiquitinates Drp1 and regulates its assembly/disassembly at fission sites [PMID:16936636, PMID:17606867], degrades the Drp1 receptor MiD49 and the fission factor MIEF2 to restrain fission [PMID:26564796, PMID:41353882], and ubiquitinates the fusion mediators Mfn1 (degradative, including cell-cycle- and acetylation-dependent control) and Mfn2 (K63-linked at K192 to drive oligomerization and ER–mitochondria tethering) [PMID:20103533, PMID:23253261, PMID:23727017, PMID:24722297]. MARCHF5 governs innate immune signaling, resolving MAVS aggregates and active RIG-I oligomers through K48-linked degradative ubiquitination to terminate antiviral signaling [PMID:26246171, PMID:31881323], activating TANK via K63-linked chains to promote NF-κB signaling [PMID:21625535], and K27-ubiquitinating NLRP3 at K324/K430 to enable inflammasome assembly [PMID:37575012]. It sets the apoptotic threshold by controlling MCL1 stability in a NOXA/MTCH2/UBE2K-dependent manner and by restraining BAK activating conformation changes [PMID:26910119, PMID:32094511, PMID:36171332]. MARCHF5 directs mitochondrial quality control and mitophagy through hypoxia-induced FUNDC1 degradation at K119, Parkin ubiquitination at K220, K6-linked ubiquitination of the mtDNA import substrates PolγA and RECQL4, and K48-linked degradation of MIC60 [PMID:28104734, PMID:33565245, PMID:33657094, PMID:37495109, PMID:37679468], and at the MAM it K63-ubiquitinates IRE1α at K481 to prevent hyper-oligomerization and limit RIDD-driven apoptosis [PMID:31368599]. Beyond mitochondria, MARCHF5 localizes to peroxisomes via PEX19 and is essential for de novo peroxisome biogenesis, transferring peroxins such as Pex26 and ubiquitinating PMP70 [PMID:34747980, PMID:39423819, PMID:39423820, PMID:42182360]. In vivo, MARCHF5 loss produces mitochondrial fragmentation, senescence, and heart failure, ferroptosis susceptibility, β-cell dysfunction via a Trim28/Kindlin-2/MafA axis, and cardiac hypertrophy through Akt signaling [PMID:35789860, PMID:34390730, PMID:40750777, PMID:40753540].","teleology":[{"year":2006,"claim":"Established that MARCH5 is an outer mitochondrial membrane E3 ligase coupling ubiquitination to mitochondrial shape, answering whether a dedicated ligase regulates fission/fusion machinery.","evidence":"Reciprocal Co-IP, RING-mutant expression, and mitochondrial morphology imaging showing MFN2/Drp1 binding and Drp1 ubiquitination","pmids":["16936636"],"confidence":"High","gaps":["Linkage type and direct substrate sites on Drp1 not defined","Whether Drp1 ubiquitination is degradative or regulatory unresolved"]},{"year":2007,"claim":"Showed the RING domain controls Drp1 trafficking and assembly at fission sites, defining MARCH5 as a dynamic regulator rather than a constitutive degrader of Drp1.","evidence":"RING mutagenesis, RNAi, FRAP of YFP-Drp1, and rescue epistasis with Drp1 vs Fis1","pmids":["17606867"],"confidence":"High","gaps":["Molecular detail of how ubiquitination alters Drp1 mobility not resolved"]},{"year":2010,"claim":"Identified Mfn1 as a major degradative substrate and linked MARCH5 activity to suppression of mitochondrial elongation and cellular senescence.","evidence":"shRNA knockdown, GTPase-deficient Mfn1 rescue, SA-β-Gal senescence assay","pmids":["20103533"],"confidence":"High","gaps":["Ubiquitination site on Mfn1 not mapped here"]},{"year":2009,"claim":"Demonstrated MARCH5 acts in mitochondrial protein quality control by selectively ubiquitinating misfolded substrates (mutant SOD1), extending its role beyond dynamics.","evidence":"In vitro ubiquitination, cycloheximide chase, siRNA knockdown, ROS measurement","pmids":["19741096","20851218"],"confidence":"High","gaps":["Recognition mechanism distinguishing misfolded from native substrates unclear"]},{"year":2013,"claim":"Resolved how MARCH5 promotes ER–mitochondria contacts, showing non-degradative K63 ubiquitination of Mfn2 at K192 activates GTP-dependent oligomerization for MAM tethering.","evidence":"Domain-mapping mutagenesis, K63-linkage assay, blue-native PAGE, GTP binding/hydrolysis assays","pmids":["23727017"],"confidence":"High","gaps":["How MARCH5 switches between K63-regulatory and K48-degradative outputs not established"]},{"year":2015,"claim":"Defined MARCH5 as a brake on antiviral signaling by degrading MAVS aggregates, linking mitochondrial ubiquitination to interferon control in vivo.","evidence":"Site-specific (K7/K500) ubiquitination assay, March5+/- mice, IFN and viral replication readouts","pmids":["26246171"],"confidence":"High","gaps":["How MARCH5 selectively recognizes aggregated vs monomeric MAVS not fully defined"]},{"year":2015,"claim":"Extended innate immune regulation to positive signaling and stem-cell biology, showing K63 ubiquitination of TANK promotes NF-κB and K63 ubiquitination of Prkar1a maintains pluripotency.","evidence":"Linkage-specific and site-specific ubiquitination assays, NF-κB reporter, PKA activity readouts, reprogramming assays","pmids":["21625535","26033541"],"confidence":"High","gaps":["How MARCH5 outputs are wired to opposing immune outcomes (activation vs termination) is unresolved"]},{"year":2015,"claim":"Identified MiD49 as a degradative substrate and self-clearance via homodimerization, clarifying how MARCH5 limits fission and controls its own abundance.","evidence":"MARCH5/MiD49 double knockout epistasis, GxxxG dimerization mutants, cycloheximide chase","pmids":["26564796","26476016"],"confidence":"High","gaps":["Quantitative balance between MiD49 and Drp1 outputs in setting fission rate not defined"]},{"year":2016,"claim":"Mapped a degradation complex requiring the MARCH5 C-terminus, Mff, and p97/Npl4 for substrate release from the OMM, explaining the extraction step downstream of ubiquitination.","evidence":"Drp1/Mff knockout and double-knockout cells, Co-IP of complex components, half-life measurements","pmids":["27932492"],"confidence":"High","gaps":["Structural basis of substrate handoff to p97 not determined"]},{"year":2016,"claim":"Established MARCH5 as the principal regulator of MCL1 stability in a NOXA/MTCH2/UBE2K-dependent manner, defining an apoptotic threshold relevant to BH3-mimetic resistance.","evidence":"Chemical/genetic MARCH5 perturbation, genome-wide CRISPR screen, NOXA-dependency, MCL1 ubiquitination/stability assays","pmids":["26910119","32094511","32484436"],"confidence":"High","gaps":["How NOXA binding licenses MCL1 for MARCH5 recognition mechanistically unresolved"]},{"year":2017,"claim":"Connected antiviral signaling to mitophagy regulation: PKAC-mediated MAVS phosphorylation primes K48 degradation, and hypoxia-induced FUNDC1 ubiquitination at K119 fine-tunes mitophagy.","evidence":"Phospho-site (T54A) and K119 site-specific mutants, linkage-specific ubiquitination, mitophagy flux assays","pmids":["28934360","28104734"],"confidence":"High","gaps":["Spatial coordination of these stress-specific substrate choices not defined"]},{"year":2019,"claim":"Defined MARCH5 control of the ER stress response and mitophagy initiation, K63-ubiquitinating IRE1α at K481 to limit RIDD and providing the initial ubiquitin substrate for PINK1/Parkin recruitment.","evidence":"K481R and linkage-specific assays, MITOL KO cells and mice, RIDD activity, Parkin recruitment assays","pmids":["31368599","31110043"],"confidence":"High","gaps":["Identity of the initial PINK1-phosphorylated ubiquitin substrate provided by MARCH5 not pinpointed"]},{"year":2019,"claim":"Extended antiviral termination to direct degradation of active RIG-I oligomers, establishing dual RIG-I/MAVS targeting to switch off RLR signaling.","evidence":"K48-linkage site-specific (K193/K203) ubiquitination, proteasome rescue, oligomer analysis","pmids":["31881323"],"confidence":"High","gaps":["Temporal sequence of RIG-I vs MAVS targeting during infection not resolved"]},{"year":2021,"claim":"Revealed MARCH5 dual localization to peroxisomes via PEX19 and its role in PMP70 ubiquitination and pexophagy, broadening its organellar reach.","evidence":"PUP-IT proximity tagging, Co-IP, MARCH5 KO, pexophagy assays","pmids":["34747980"],"confidence":"High","gaps":["Determinants directing MARCH5 to peroxisomes vs mitochondria not defined here"]},{"year":2021,"claim":"Defined MARCH5 control over mtDNA maintenance and mitophagy fine-tuning via K6-linked ubiquitination of PolγA (K1060) and Parkin (K220), gating mitochondrial import and Parkin turnover.","evidence":"In vitro and K6-linkage-specific ubiquitination, site-specific mutants, Tom20 binding and mtDNA replication assays, PEO/patient mutant analysis","pmids":["33657094","33565245"],"confidence":"High","gaps":["How K6 linkage is decoded to block Tom20-mediated import mechanistically unclear"]},{"year":2021,"claim":"Linked MARCH5 to cardiac homeostasis in vivo, showing its loss causes Drp1-driven fragmentation, senescence, heart failure, and ferroptosis susceptibility via reduced mitochondrial GPX4.","evidence":"Cardiomyocyte-specific conditional KO mice, MI and doxorubicin models, AAV rescue, GSH/GSSG and lipid peroxidation assays","pmids":["35789860","34390730","33970775"],"confidence":"High","gaps":["Whether ferroptosis protection is direct GPX4 regulation or secondary to dynamics unresolved"]},{"year":2022,"claim":"Established MARCH5 restrains BAK activating conformation independently of BH3-only proteins, defining an apoptosis-suppressive function beyond MCL1 turnover.","evidence":"Genome-wide CRISPR screen, multiple cell lines, BAK conformation and BH3-mimetic response assays","pmids":["36171332"],"confidence":"High","gaps":["Whether BAK restraint is via direct ubiquitination or indirect not determined"]},{"year":2023,"claim":"Expanded immune regulation to NLRP3 inflammasome and STING control, with K27 ubiquitination enabling NLRP3-NEK7 assembly and STING ubiquitination preventing oxidation-induced inactive polymers.","evidence":"Site-specific (K324/K430) K27-linkage assays, myeloid conditional KO mice, STING polymer/ROS analyses","pmids":["37575012","37916870","38040710"],"confidence":"High","gaps":["How K27 chains are decoded to template inflammasome oligomerization is unclear"]},{"year":2023,"claim":"Added MIC60 (K48 at K285), RECQL4 (K6 at K1101/K1154), and γc cytokine receptor (K27) as substrates, linking MARCH5 to cristae integrity, mtDNA import, and T-cell cytokine signaling.","evidence":"Site-specific linkage assays, TRAP1 competition, RTS patient mutants, PD-1/BATF-dependent γc degradation","pmids":["37679468","37495109","37932447"],"confidence":"High","gaps":["Coordination of these distinct linkage outputs on different substrates not unified"]},{"year":2024,"claim":"Established an essential role in de novo peroxisome biogenesis from mitochondria, with MARCH5 acting upstream of Pex14 and degrading MPC1 to promote glycolysis.","evidence":"Multiple/double KO epistasis (Pex14, Pex3), fatty-acid-induced biogenesis, activity-mutant accumulation on pre-peroxisomes, metabolic OCR/ECAR assays","pmids":["39423819","39423820","38615083"],"confidence":"High","gaps":["Substrates ubiquitinated during the mitochondrial steps of biogenesis incompletely defined"]},{"year":2025,"claim":"Defined an in vivo β-cell signaling axis (Trim28/Kindlin-2/MafA) and cardiac hypertrophy via Akt, plus K27 ubiquitination of JEV envelope protein, broadening MARCH5 into endocrine, cardiac, and viral-host contexts.","evidence":"β-cell and cardiac conditional/heterozygous KO mice, epistasis rescue, Co-IP, site-specific viral E-protein ubiquitination assays","pmids":["40750777","40753540","40071916"],"confidence":"High","gaps":["Whether Akt phosphorylation enhancement is direct or via a substrate intermediary unresolved"]},{"year":2026,"claim":"Linked DAPK1-mediated Parkin phosphorylation to MARCH5-dependent Parkin degradation in neurotoxicity, integrating phospho-signaling with the K220 ubiquitination event.","evidence":"Phospho-site mutants (S136A/S198A), Co-IP, ubiquitination assay, 6-OHDA neurotoxicity model","pmids":["41943176"],"confidence":"Medium","gaps":["Single-lab; how phosphorylation directs Parkin to MITOL not structurally defined"]},{"year":null,"claim":"How MARCH5 selects among dozens of substrates and assembles distinct ubiquitin linkage types (K6, K27, K48, K63) with opposing regulatory vs degradative outcomes at specific subcellular sites remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying substrate-recognition or linkage-determination model","Structural basis for linkage-type specificity unknown","Coordination of mitochondrial vs peroxisomal pools not mechanistically defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,8,12,16,28,34,39]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,6,8,10,16,28,38,39]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,12,34]}],"localization":[{"term_id":"GO:0005777","term_label":"peroxisome","supporting_discovery_ids":[26,40,48]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8,18,27]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,3,10,40]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,12,20,34,36,37]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[15,23,24,31]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16,19,27,26]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,39,28,38]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[18]}],"complexes":["MARCH5/p97/Npl4 degradation complex","MARCH5 homodimer"],"partners":["DRP1","MFN1","MFN2","MAVS","MCL1","FUNDC1","MTCH2","MID49"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NX47","full_name":"E3 ubiquitin-protein ligase MARCHF5","aliases":["Membrane-associated RING finger protein 5","Membrane-associated RING-CH protein V","MARCH-V","Mitochondrial ubiquitin ligase","MITOL","RING finger protein 153","RING-type E3 ubiquitin transferase MARCHF5"],"length_aa":278,"mass_kda":31.2,"function":"Mitochondrial E3 ubiquitin-protein ligase that plays a crucial role in the control of mitochondrial morphology by acting as a positive regulator of mitochondrial fission and as an important regulator of immune response (PubMed:16874301, PubMed:17606867, PubMed:26246171, PubMed:31881323). Plays a crucial role in maintaining mitochondrial homeostasis by regulating the dynamics of mitochondria through the ubiquitination of key proteins involved in fission and fusion such as FIS1, DNM1L and MFN1 (PubMed:16874301, PubMed:17606867). Acts as a critical determinant of mitotic apoptosis through both MCL1-dependent and -independent pathways (By similarity). Turns off persistent immune signaling by degrading oligomeric complexes of retinoic acid-inducible gene I/DDX58 and mitochondrial antiviral-signaling protein/MAVS formed upon RNA virus infection (PubMed:26246171, PubMed:31881323, PubMed:40071916). Promotes STING-mediated type-I interferon production via 'Lys-63'-linked ubiquitination of STING1 thereby preserving its activity and preventing the formation of inactive STING1 polymers (PubMed:37916870). Plays also an essential role in the formation of PEX3-containing vesicles in the de novo biogenesis of peroxisomes from mitochondria (PubMed:39423820, PubMed:39423819). Acts as a regulator of NLRP3 inflammasome activation on the mitochondria by mediating the 'Lys-27'-linked polyubiquitination of NLRP3, positively regulating the NLRP3-NEK7 complex formation and NLRP3 oligomerization (PubMed:37575012) (Microbial infection) Plays a positive role in Japanese encephalitis virus infection by catalyzing the 'Lys-27'-linked polyubiquitination of viral E protein to facilitate efficient viral attachment","subcellular_location":"Mitochondrion outer membrane; Endoplasmic reticulum membrane; Peroxisome membrane","url":"https://www.uniprot.org/uniprotkb/Q9NX47/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MARCHF5","classification":"Not Classified","n_dependent_lines":395,"n_total_lines":1090,"dependency_fraction":0.3623853211009174},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MARCHF5","total_profiled":1310},"omim":[{"mim_id":"610637","title":"MEMBRANE-ASSOCIATED RING-CH FINGER PROTEIN 5; MARCHF5","url":"https://www.omim.org/entry/610637"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MARCHF5"},"hgnc":{"alias_symbol":["FLJ20445","MARCH-V","MITOL"],"prev_symbol":["RNF153","MARCH5"]},"alphafold":{"accession":"Q9NX47","domains":[{"cath_id":"3.30.40.10","chopping":"7-76","consensus_level":"medium","plddt":89.9601,"start":7,"end":76},{"cath_id":"-","chopping":"77-158","consensus_level":"medium","plddt":94.2509,"start":77,"end":158},{"cath_id":"-","chopping":"159-268","consensus_level":"medium","plddt":81.1445,"start":159,"end":268}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NX47","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NX47-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NX47-F1-predicted_aligned_error_v6.png","plddt_mean":85.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MARCHF5","jax_strain_url":"https://www.jax.org/strain/search?query=MARCHF5"},"sequence":{"accession":"Q9NX47","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NX47.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NX47/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NX47"}},"corpus_meta":[{"pmid":"17606867","id":"PMC_17606867","title":"The mitochondrial E3 ubiquitin ligase MARCH5 is required for Drp1 dependent mitochondrial division.","date":"2007","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/17606867","citation_count":397,"is_preprint":false},{"pmid":"16936636","id":"PMC_16936636","title":"MARCH-V is a novel mitofusin 2- and Drp1-binding protein able to change mitochondrial morphology.","date":"2006","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/16936636","citation_count":354,"is_preprint":false},{"pmid":"28104734","id":"PMC_28104734","title":"Mitochondrial E3 ligase MARCH5 regulates FUNDC1 to fine-tune hypoxic mitophagy.","date":"2017","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/28104734","citation_count":261,"is_preprint":false},{"pmid":"23727017","id":"PMC_23727017","title":"MITOL regulates endoplasmic reticulum-mitochondria contacts via Mitofusin2.","date":"2013","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/23727017","citation_count":254,"is_preprint":false},{"pmid":"20103533","id":"PMC_20103533","title":"Loss of MARCH5 mitochondrial E3 ubiquitin ligase induces cellular senescence through dynamin-related protein 1 and mitofusin 1.","date":"2010","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/20103533","citation_count":203,"is_preprint":false},{"pmid":"26246171","id":"PMC_26246171","title":"The mitochondrial ubiquitin ligase MARCH5 resolves MAVS aggregates during antiviral signalling.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/26246171","citation_count":141,"is_preprint":false},{"pmid":"26564796","id":"PMC_26564796","title":"Mitochondrial E3 ubiquitin ligase MARCH5 controls mitochondrial fission and cell sensitivity to stress-induced apoptosis through regulation of MiD49 protein.","date":"2015","source":"Molecular biology of the 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RING finger mutations cause mitochondrial fragmentation.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and RING-mutant expression, mitochondrial morphology imaging\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, RING mutant functional analysis, morphology readout; replicated by independent labs\",\n      \"pmids\": [\"16936636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MARCH5 RING domain activity is required for Drp1-dependent mitochondrial fission; RING mutants cause mitochondrial elongation reversed by ectopic Drp1 but not Fis1; MARCH5 regulates subcellular trafficking of Drp1 (assembly/disassembly at fission sites) as shown by abnormal Drp1 clustering and reduced YFP-Drp1 mobility in MARCH5 RING mutant cells; MARCH5 RING mutants and endogenous Drp1 co-assemble into enlarged clusters in a Drp1 GTPase-dependent manner.\",\n      \"method\": \"RING domain mutagenesis, RNAi knockdown, FRAP of YFP-Drp1, co-immunoprecipitation, mitochondrial morphology imaging, rescue epistasis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (FRAP, mutagenesis, RNAi, epistasis), replicated across labs\",\n      \"pmids\": [\"17606867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MITOL/MARCH5 interacts with and ubiquitinates mutant SOD1 (mSOD1) but not wild-type SOD1 in mitochondria; in vitro ubiquitination assay confirmed direct ubiquitination; MITOL overexpression promotes mSOD1 degradation and suppresses mitochondrial mSOD1 accumulation and mSOD1-induced ROS generation; MITOL knockdown or CS-mutant expression increases mSOD1 accumulation, ROS, and cell death.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, cycloheximide-chase, siRNA knockdown, ROS measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination assay plus cellular knockdown/overexpression with defined readouts, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19741096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MARCH5 knockdown causes accumulation of elongated, interconnected mitochondria and cellular senescence (SA-β-Gal activity); Mfn1 levels specifically increase in MARCH5-depleted cells identifying Mfn1 as a major ubiquitylation substrate; introduction of GTPase-deficient Mfn1(T109A) abolishes both mitochondrial elongation and senescence; ectopic Drp1 (but not Fis1) rescues mitochondrial morphology and reduces senescence.\",\n      \"method\": \"shRNA knockdown, RING domain mutant expression, SA-β-Gal assay, rescue epistasis, western blot for substrate levels\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple epistasis experiments, defined substrate (Mfn1), senescence phenotype with mechanistic rescue, replicated by prior literature\",\n      \"pmids\": [\"20103533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MITOL/MARCH5 promotes degradation of polyglutamine-expanded ataxin-3 (ΔNAT-3Q71) via the ubiquitin-proteasome pathway; MITOL knockdown induces accumulation of detergent-insoluble polyQ aggregates, cytochrome c release, and cell death.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, siRNA knockdown, cycloheximide chase, cytochrome c release assay\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional knockdown with defined readout, single lab, multiple methods\",\n      \"pmids\": [\"20851218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MARCH5 positively regulates TLR7 signaling by interacting with TANK and catalyzing K63-linked poly-ubiquitination of TANK at Lys229, 233, 280, 302, and 306, thereby impairing TANK's ability to inhibit TRAF6 and enhancing NF-κB-mediated gene expression; mitochondrial localization of MARCH5 is required for this effect.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay with linkage-specific ubiquitin mutants, site-directed mutagenesis, MARCH5 mislocalization construct, NF-κB reporter assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-specific mutagenesis identifying exact ubiquitination sites, linkage-type determination, localization requirement, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"21625535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MITOL/MARCH5 ubiquitinates S-nitrosylated MAP1B-light chain 1 (LC1); S-nitrosylation of LC1 causes a conformational change that both activates LC1 and promotes its ubiquitination by MITOL, linking microtubule stabilization to MITOL; excessive NO inhibits MITOL, leading to accumulation of S-nitrosylated LC1 and neuronal cell death.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination, MITOL knockdown, NO stimulation, mitochondrial dysfunction readouts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination plus cellular knockdown with mechanistic conformational change analysis, single lab, multiple methods\",\n      \"pmids\": [\"22308378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mfn1 is degraded through MARCH5-mediated ubiquitylation specifically in G2/M phase; Mfn1 interacts with cyclin B1 and their interaction is stronger in G2/M phase, suggesting cyclin B1/Cdk1 facilitates MARCH5-mediated Mfn1 degradation during mitotic entry.\",\n      \"method\": \"Co-immunoprecipitation, western blot for protein levels at cell cycle stages, ubiquitylation assay\",\n      \"journal\": \"Cell division\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and cell-cycle-synchronized degradation assays with ubiquitylation readout, single lab\",\n      \"pmids\": [\"23253261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MITOL/MARCH5 regulates MAM (mitochondria-associated ER membrane) domain formation through mitofusin 2 (Mfn2): MITOL interacts with mitochondrial Mfn2 (not ER-associated Mfn2) via MITOL C-terminal domain and Mfn2 HR1 domain; MITOL mediates K63-linked polyubiquitin chain addition to Mfn2 at K192 (identified by mutation analysis) without proteasomal degradation; this K192 ubiquitination activates GTP-dependent Mfn2 oligomerization required for ER-mitochondria tethering.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping mutagenesis, K63-linkage-specific ubiquitin assay, sucrose-density gradient centrifugation, blue-native PAGE, GTP binding/hydrolysis assay, MITOL knockdown with MAM function readout\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including structural/biochemical assays, specific ubiquitination site identified by mutagenesis, GTP functional assays, single lab with strong evidence\",\n      \"pmids\": [\"23727017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MARCH5 binds Mfn1 and mediates its ubiquitylation; acetylated Mfn1 (at K491) shows enhanced interaction with MARCH5 and increased ubiquitylation; acetylation-deficient Mfn1(K491R) shows reduced MARCH5 binding and ubiquitylation; MARCH5-knockout MEFs and MARCH5(H43W)-expressing cells undergo rapid cell death under mitochondrial stress, demonstrating that MARCH5-mediated quality control on acetylated Mfn1 is required for cell survival.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assay, acetylation-deficient and mimetic mutants, MARCH5 knockout MEFs, cell death assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutants identifying acetylation-dependent interaction, MARCH5 KO MEFs, multiple methods, single lab\",\n      \"pmids\": [\"24722297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MARCH5 controls Drp1-dependent mitochondrial fission and cell sensitivity to stress-induced apoptosis by selectively ubiquitinating and targeting MiD49 (a mitochondrial Drp1 receptor) for proteasomal degradation; MARCH5 knockout causes MiD49 accumulation and mitochondrial fragmentation; MiD49 knockout in MARCH5-/- cells reverses fragmentation and reduces apoptosis sensitivity.\",\n      \"method\": \"MARCH5 knockout, MiD49 knockout, ubiquitination assay, proteasome inhibitor experiments, mitochondrial morphology imaging, apoptosis assay, rescue epistasis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double knockout epistasis, ubiquitination assay, multiple orthogonal readouts, single lab with strong controls\",\n      \"pmids\": [\"26564796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MARCH5 forms homodimers through a GxxxG dimerization motif (first motif critical); dimerization-defective MARCH5(4GL) mutant cannot degrade accumulated inactive MARCH5 mutants, showing that MARCH5 self-clearance via ubiquitin-proteasome pathway requires homodimerization; inactive MARCH5 mutants have ~4-fold longer half-life and accumulation activates NF-κB.\",\n      \"method\": \"Co-immunoprecipitation, dimerization motif mutagenesis, cycloheximide chase, NF-κB reporter assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutagenesis of dimerization motif, half-life measurements, single lab\",\n      \"pmids\": [\"26476016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MARCH5 is the mitochondrial E3 ligase that resolves MAVS aggregates during antiviral signaling; MARCH5 binds MAVS only when MAVS forms aggregates during viral stimulation, requiring MARCH5 RING domain and MAVS CARD domain; MARCH5 transfers ubiquitin to MAVS at Lys7 and Lys500 promoting proteasomal degradation; March5+/- mice show elevated type-I interferon responses and reduced viral replication.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay with site-specific mutants, March5+/- mouse model, IFN response measurement, viral replication assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific ubiquitination sites identified, in vivo mouse model, multiple orthogonal methods, replicated conceptually\",\n      \"pmids\": [\"26246171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"March5, as a transcriptional target of Klf4, maintains mouse ESC pluripotency by catalyzing K63-linked polyubiquitination of Prkar1a (a negative regulatory subunit of PKA), thereby activating PKA and inhibiting the Raf/MEK/ERK pathway.\",\n      \"method\": \"March5 knockdown/overexpression in mESCs, K63-ubiquitin assay, PKA activity measurement, ERK pathway readouts, rescue experiments, somatic cell reprogramming\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — linkage-specific ubiquitin assay, PKA activation readout, pathway inhibitor rescue, multiple methods in single lab\",\n      \"pmids\": [\"26033541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MARCH5 C-terminal domain plays a critical role in degradation of MARCH5 substrates (MiD49 and Mcl1), likely by facilitating release of ubiquitinated proteins from the OMM; Drp1 and Mff negatively regulate MARCH5 activity toward MiD49 and Mcl1, as knockout of either leads to reduced expression and increased ubiquitination of these substrates; Mff is an integral component of the MARCH5/p97/Npl4 degradation complex.\",\n      \"method\": \"Drp1/Mff knockout cells, double knockout (Drp1-/-/MARCH5-/- and Mff-/-/MARCH5-/-), ubiquitination assays, co-immunoprecipitation, half-life measurements\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double knockout epistasis, Co-IP of complex components, multiple cell line models, single lab with comprehensive controls\",\n      \"pmids\": [\"27932492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MARCH5 inhibition abrogates MCL1-dependent resistance to BH3 mimetic ABT-737 through NOXA-dependent regulation of MCL1 ubiquitylation and stability; MARCH5 controls MCL1 ubiquitylation in a NOXA-dependent manner.\",\n      \"method\": \"Chemical inhibition and genetic knockdown of MARCH5, MCL1 ubiquitylation assay, NOXA-dependency rescue experiments, cancer cell apoptosis assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitylation assay and NOXA-dependency demonstrated, single lab, mechanistic follow-up\",\n      \"pmids\": [\"26910119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MARCH5 ubiquitylates and degrades FUNDC1 (a mitophagy receptor) specifically in response to hypoxia, targeting K119 of FUNDC1; MARCH5 directly interacts with FUNDC1, and this interaction is enhanced by hypoxic stress; MARCH5-mediated FUNDC1 degradation fine-tunes hypoxia-induced mitophagy; MARCH5 knockdown causes FUNDC1 accumulation and exaggerated mitophagy.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay with K119 site-specific mutant, MARCH5 knockdown/overexpression, mitophagy flux measurement\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific ubiquitination site identified by mutagenesis, interaction confirmed by Co-IP, mitophagy functional readout, replicated in companion paper\",\n      \"pmids\": [\"28104734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PKACs (protein kinase A catalytic subunits) phosphorylate MAVS/VISA at T54, abrogating virus-induced MAVS aggregation and priming it for K48-linked polyubiquitination and proteasomal degradation by MARCH5; phosphorylation at T54 is required for MARCH5-mediated MAVS degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, phosphorylation-site mutant (T54A), PKAC inhibitor H89, antiviral signaling assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mutagenesis, linkage-specific ubiquitin assay, PKAC inhibitor, multiple methods in single lab\",\n      \"pmids\": [\"28934360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MITOL/MARCH5 ubiquitylates IRE1α at K481 with K63-linked chains at the MAM, preventing IRE1α hyper-oligomerization and RIDD activity; MITOL depletion or IRE1α K481R mutant allows hyper-oligomerization and enhanced RIDD, resulting in apoptosis; in spinal cord of MITOL-deficient mice, ER stress enhances RIDD activity and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, K63-linkage ubiquitination assay, K481R site-specific mutant, MITOL knockout cells and mice, RIDD activity assay, IRE1α oligomerization assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — specific ubiquitination site mutagenesis, in vivo mouse model, RIDD functional readout, multiple orthogonal methods, single lab with strong evidence\",\n      \"pmids\": [\"31368599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MITOL/MARCH5 facilitates initial Parkin recruitment to impaired mitochondria by providing ubiquitin substrate for PINK1-mediated phosphorylation; depletion of MITOL/MARCH5 delays Parkin recruitment and activation on damaged mitochondria.\",\n      \"method\": \"MITOL/MARCH5 depletion, Parkin recruitment assay, mitochondrial damage model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional depletion with Parkin recruitment readout, mechanistic model proposed with supporting data, single lab\",\n      \"pmids\": [\"31110043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MARCH5 targets and degrades active RIG-I (but not its inactive phosphomimetic form RIG-IS8E) via K48-linked polyubiquitination at Lys193 and Lys203 of RIG-I; MARCH5 RING domain binds RIG-I CARD domain; co-expression of MARCH5 reduces RIG-I oligomers; dual targeting of RIG-I and MAVS by MARCH5 turns off RLR signaling.\",\n      \"method\": \"Co-immunoprecipitation, in vivo K48-ubiquitination assay with site-specific mutants, proteasome inhibitor rescue, poly(I:C) stimulation, oligomer analysis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific ubiquitination sites identified by mutagenesis, linkage-type determined, domain interaction mapped, single lab with multiple methods\",\n      \"pmids\": [\"31881323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MARCH5 interacts with HBx protein in mitochondria via its N-terminal RING domain, targets HBx for proteasomal degradation, and eliminates HBx protein aggregates; MARCH5 lacking E3 ligase activity (H43W) fails to reduce HBx levels; MARCH5-mediated HBx degradation suppresses HBx-induced ROS, mitophagy, and COX-2 expression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RING domain mutant (H43W), proteasome inhibitor, semi-denaturing detergent agarose gel for aggregates, ROS measurement\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, E3-dead mutant, aggregate clearance assay with functional readouts, single lab\",\n      \"pmids\": [\"31819032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MARCH5 is the primary mediator of NOXA-dependent MCL1 degradation in prostate cancer cells; increased NOXA (via kinase inhibitor-induced integrated stress response) drives MARCH5-mediated MCL1 degradation, enhancing apoptosis in response to BH3 mimetics.\",\n      \"method\": \"MARCH5 genetic manipulation, NOXA overexpression/knockdown, MCL1 ubiquitination and stability assays, apoptosis with BH3 mimetics\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation of pathway components, MCL1 ubiquitination assay, functional apoptosis readout, single lab\",\n      \"pmids\": [\"32484436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MARCH5, UBE2K (E2), and MTCH2 (outer mitochondrial membrane protein) co-operate to mark MCL1 for proteasomal degradation specifically when MCL1 is bound by NOXA; degradation requires the MCL1 transmembrane domain and specific MCL1 lysine residues; MTCH2 is essential for MARCH5-mediated MCL1:NOXA complex turnover.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, genetic validation of MARCH5, UBE2K, MTCH2 knockouts, MCL1 ubiquitination and stability assays, NOXA-dependency experiments\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased genome-wide screen plus rigorous genetic validation, multiple components of complex identified, NOXA-dependency demonstrated, single lab with strong evidence\",\n      \"pmids\": [\"32094511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MARCH5 determines the initial MCL1-NOXA levels upon mitotic entry; MARCH5 knockout paradoxically enhances mitotic apoptosis in a BAK-dependent manner independently of MCL1 and other BH3-only proteins; DRP1 disruption reduces mitotic apoptosis in MARCH5-disrupted cells, linking mitochondrial fission maintenance to the pro-apoptotic role of MARCH5 loss.\",\n      \"method\": \"MARCH5 knockout, MCL1 knockout, BAK knockout, DRP1 knockout, mitotic apoptosis assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple KO epistasis experiments, defined apoptotic readouts, single lab\",\n      \"pmids\": [\"32015503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MARCHF5/MARCH5 is degraded by chaperone-mediated autophagy (CMA) via interaction with key CMA regulators (HSPA8, LAMP2A); severe oxidative stress compromises CMA activity, stabilizing MARCHF5, which facilitates DRP1 translocation and excessive mitochondrial fission; increasing CMA activity promotes MARCHF5 turnover, reduces DRP1 translocation, and reduces mitochondrial fragmentation.\",\n      \"method\": \"CMA substrate identification, Co-IP with CMA regulators, lysosomal degradation assay, MARCHF5 stability measurement, DRP1 translocation assay, mitochondrial morphology imaging, PD rodent model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with CMA machinery, functional manipulation of CMA, DRP1 readout, in vivo PD model, single lab\",\n      \"pmids\": [\"33970775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MARCH5 localizes to peroxisomes (in addition to mitochondria) via PEX19 binding to its transmembrane region; on peroxisomes, MARCH5 binds and mediates ubiquitination of PMP70; PMP70 ubiquitination and mTOR-inhibition-induced pexophagy are blocked in the absence of MARCH5.\",\n      \"method\": \"PUP-IT proximity tagging, co-immunoprecipitation, subcellular fractionation and imaging, ubiquitination assay, MARCH5 knockout, pexophagy assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity tagging plus Co-IP, MARCH5 KO functional assay, dual localization confirmed, multiple methods\",\n      \"pmids\": [\"34747980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MITOL/MARCH5 promotes proteasomal degradation of Parkin by ubiquitinating Parkin at K220, fine-tuning mitophagy; MITOL deletion leads to accumulation of phosphorylated active Parkin in the ER, causing FKBP38 degradation and enhanced cell death; MITOL undergoes FKBP38-dependent translocation from mitochondria to ER during mitophagy.\",\n      \"method\": \"Co-immunoprecipitation, K220 site-specific ubiquitination assay, MITOL knockout cells, subcellular fractionation imaging, cell death assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific ubiquitination site identified, MITOL KO with functional readouts, subcellular relocalization documented, single lab with multiple methods\",\n      \"pmids\": [\"33565245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MITOL/MARCH5 ubiquitylates PolγA (mitochondrial DNA polymerase) at K1060 via K6-linked ubiquitin chain; this ubiquitylation negatively regulates PolγA binding to Tom20 and its entry into mitochondria; certain PEO patient PolγA mutants are hyperubiquitylated by MITOL and fail to enter mitochondria, compromising mtDNA replication.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, K6-linkage-specific ubiquitin assay, Tom20 binding assay, mitochondrial import assay, BrdU incorporation into mtDNA\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination assay plus cellular import and mtDNA replication readouts, specific site identified, patient mutant analysis, single lab\",\n      \"pmids\": [\"33657094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MITOL/MARCH5 cardiac-specific knockout mice develop mitochondrial fragmentation, dysfunction (reduced ATP, increased ROS), myocardial senescence, and chronic heart failure through persistent Drp1 accumulation; AAV-mediated MITOL gene delivery ameliorates cardiac dysfunction after MI.\",\n      \"method\": \"Cardiomyocyte-specific conditional knockout mice, mitochondrial morphology and function assays, in vivo MI model, AAV gene delivery\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse with cardiac phenotype, AAV rescue, mechanistic link to Drp1, multiple in vivo readouts\",\n      \"pmids\": [\"35789860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MITOL/MARCH5 knockdown in cardiomyocytes (NRVMs) reduces mitochondria-localized GPX4, decreasing GSH/GSSG ratio and promoting lipid peroxide accumulation leading to ferroptosis; MITOL knockdown increases CHAC1 (GSH-degrading enzyme) expression; cardiac-specific MITOL knockout mice show enhanced susceptibility to doxorubicin-induced ferroptosis.\",\n      \"method\": \"siRNA knockdown, cardiac-specific MITOL KO mice, GPX4 expression analysis, GSH/GSSG measurement, lipid peroxidation assay, ferroptosis inhibitor (ferrostatin-1) rescue\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cardiac KO mouse, multiple mechanistic readouts, ferroptosis inhibitor rescue, multiple cell and in vivo models\",\n      \"pmids\": [\"34390730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MARCHF5/MITOL loss drives BAK to adopt an activated conformation independently of BH3-only proteins, forming inhibitory complexes with MCL-1 and BCL-XL, conferring resistance to BH3-mimetic drugs; MARCHF5 restrains BAK activating conformation change.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, MARCHF5 deletion in multiple cell lines, BAK conformation assay, BH3-mimetic drug response assay, co-immunoprecipitation\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased genome-wide screen, multiple cell lines, BAK conformation functional assay, BH3-only protein independence demonstrated\",\n      \"pmids\": [\"36171332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MITOL/MARCH5 interacts with and ubiquitinates RMDN3/PTPIP51 at K89, activating its phosphatidic acid (PA)-binding and transfer activity; loss of MITOL or K89R substitution in RMDN3 significantly reduces PA-binding activity at the mitochondria-ER contact site.\",\n      \"method\": \"APEX2 proximity labeling, co-immunoprecipitation, K89 site-specific ubiquitination assay, PA-binding activity assay, MITOL knockout\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling plus Co-IP, specific ubiquitination site identified, functional PA-binding assay, single lab\",\n      \"pmids\": [\"34964862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the context of CMT2A-linked MFN2 R364W mutation, MITOL shows weaker interaction with R364W-MFN2 than wild-type MFN2, making MITOL more available for DRP1 ubiquitylation; this leads to multi-monoubiquitylation and proteasomal degradation of DRP1 resulting in mitochondrial hyperfusion.\",\n      \"method\": \"Co-immunoprecipitation comparing WT vs R364W MFN2, ubiquitylation assay, DRP1 stability assay, mitochondrial morphology imaging\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comparative Co-IP, ubiquitylation assay, morphology readout, single lab\",\n      \"pmids\": [\"34870686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MARCH5 interacts with the NACHT domain of NLRP3 and promotes K27-linked polyubiquitination at K324 and K430 of NLRP3; this ubiquitination is required for NLRP3-NEK7 complex formation and NLRP3 oligomerization; myeloid-cell-specific March5 conditional knockout mice fail to secrete IL-1β/IL-18 and show attenuated LPS/P. aeruginosa-induced mortality.\",\n      \"method\": \"Co-immunoprecipitation, K27-linkage-specific ubiquitination assay, site-specific NLRP3 mutants (K324R, K430R), March5 conditional KO mice, inflammasome activation assays (IL-1β/IL-18), ASC speck formation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific ubiquitination sites identified by mutagenesis, conditional KO mice with in vivo readouts, multiple methods, mechanistic epistasis\",\n      \"pmids\": [\"37575012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PD-1 ligation induces BATF-dependent transcriptional upregulation of MARCH5, which then mediates K27-linked polyubiquitination and lysosomal degradation of the common cytokine receptor γ chain (γc), impairing γc family cytokine signaling in CD8+ T cells.\",\n      \"method\": \"PD-1 ligation, BATF knockout, MARCH5 overexpression/knockdown, K27-ubiquitin assay, γc protein stability measurement, cytokine signaling assays\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — linkage-specific ubiquitin assay, BATF KO, PD-1 signaling functional readout, multiple methods in single lab\",\n      \"pmids\": [\"37932447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MARCH5 ubiquitinates STING to enhance its activation; long-term MARCH5 deficiency leads to ROS production that oxidizes STING at C205, forming inactive STING polymers; MARCH5-mediated ubiquitination of STING prevents oxidation-induced inactive polymer formation.\",\n      \"method\": \"MARCH5 knockout, STING ubiquitination assay, STING polymer analysis, ROS measurement, cysteine mutant (C205) analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MARCH5 KO, ubiquitination assay, polymer formation analysis, mechanistic oxidation-ubiquitination crosstalk demonstrated, single lab\",\n      \"pmids\": [\"37916870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MARCH5 binds active DNA-PKcs in cells with mitochondrial DNA double-strand breaks and promotes degradation of DNA-PKcs to reduce type I interferon response; MARCH5 knockout prolongs phospho-HSPA8 levels and mIFNB1 synthesis after LPS stimulation; DNA-PKcs activation is VDAC1-dependent.\",\n      \"method\": \"Co-immunoprecipitation, MARCH5 KO macrophages, DNA-PKcs stability assay, IFN-β measurement, mtDNA DSB induction system, VDAC1-dependency analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, MARCH5 KO functional readout, VDAC1-dependency, single lab with multiple methods\",\n      \"pmids\": [\"38040710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MITOL/MARCH5 ubiquitylates RECQL4 at K1101 and K1154 via K6-linked ubiquitin, preventing RECQL4 interaction with Tom20 and its mitochondrial entry; RTS patient RECQL4 mutants are hyperubiquitylated by MITOL and cannot enter mitochondria; MITOL depletion rescues mtDNA replication in some RTS mutant cells; RECQL4 accumulation on mitochondrial outer surface potentiates mitophagy.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, K6-linkage ubiquitin assay, K1101/K1154 site-specific mutants, Tom20 binding assay, mitochondrial import assay, BrdU-mtDNA replication, RTS patient mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination plus cellular functional assays, specific sites identified, patient mutant analysis, multiple methods, single lab\",\n      \"pmids\": [\"37495109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MARCH5 mediates K48-linked ubiquitination of MIC60 at K285, promoting its degradation; mutation of MIC60 K285 or MARCH5 MIC60-interacting motifs abrogates ubiquitination; TRAP1 inhibits MARCH5-mediated MIC60 ubiquitination by competing with MARCH5 for MIC60 binding.\",\n      \"method\": \"Co-immunoprecipitation, K48-linkage ubiquitination assay, K285 site-specific mutant, MARCH5 interaction motif mutants, TRAP1 competition assay, MARCH5 silencing\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific ubiquitination site by mutagenesis, K48-linkage confirmed, competition mechanism with TRAP1 demonstrated, multiple methods, single lab\",\n      \"pmids\": [\"37679468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MARCH5 is essential for de novo peroxisome biogenesis from mitochondria; MARCH5 knockout leads to accumulation of immature peroxisomes and reduced peroxisomal proteins; MARCH5 redistributes to peroxisomes during fatty-acid-induced biogenesis; MARCH5 activity-deficient mutants accumulate on Tom20-positive mitochondria-derived pre-peroxisomes; MARCH5 acts upstream of Pex14 in mitochondrial steps of peroxisome biogenesis.\",\n      \"method\": \"MARCH5 knockout, double knockout (MARCH5/Pex14, MARCH5/Pex3), subcellular imaging and fractionation, fatty-acid-induced biogenesis assay, MARCH5 activity mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO models, double KO epistasis, MARCH5 activity mutants, functional biogenesis assay, two concurrent independent papers\",\n      \"pmids\": [\"39423819\", \"39423820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MARCH5 ubiquitinates and degrades MPC1 (mitochondrial pyruvate carrier 1), promoting aerobic glycolysis (Warburg effect) in ovarian cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, MPC1 stability measurement, MARCH5 knockdown/overexpression, metabolic (OCR/ECAR) assays\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, metabolic functional readout, single lab\",\n      \"pmids\": [\"38615083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MARCH5 interacts with and ubiquitinates RACGAP1, promoting its degradation; MARCH5-RACGAP1-DRP1 axis controls mitochondrial quality and aortic valve calcification; inhibiting RACGAP1 reverses osteogenic transformation induced by MARCH5 silencing.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, molecular docking, ubiquitination assay, MARCH5 silencing/overexpression, RACGAP1 knockdown, in vivo aortic valve model\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, in vivo model, epistasis, single lab\",\n      \"pmids\": [\"39880131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MARCH5 directly interacts with and ubiquitinates Trim28, targeting it for degradation; MARCH5-mediated Trim28 degradation prevents Trim28-mediated Kindlin-2 degradation, elevating MafA and insulin expression in β-cells; Trim28 deletion in β-cells rescues glucose intolerance in March5-deficient mice, establishing a March5/Trim28/Kindlin-2/MafA pathway in β-cell function.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, March5 conditional β-cell KO mice, Trim28 β-cell KO mice, insulin expression and glucose tolerance assays, islet transplantation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional KO mouse models, epistasis rescue, multiple mechanistic pathway components identified, Co-IP and ubiquitination assay\",\n      \"pmids\": [\"40750777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MARCH5 directly interacts with Akt and enhances phosphorylation of Akt, mTOR, and Gsk3β, increasing GATA4 expression and promoting cardiac hypertrophy; MARCH5 heterozygous mice subjected to TAC show attenuated cardiac hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation, western blot for phosphorylation, MARCH5 overexpression/knockdown, MARCH5+/- mice with TAC model, cardiomyocyte area measurement\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with Akt, phosphorylation readouts, in vivo heterozygous mouse model, single lab\",\n      \"pmids\": [\"40753540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MARCH5 mediates K27-linked ubiquitination of JEV envelope (E) protein at K136 and K166, enhancing viral attachment; K136R-K166R double mutation attenuates JEV infection in vitro and in vivo; MARCH5 also degrades MAVS via K48-linked ubiquitination at K286, suppressing type I IFN production during JEV infection.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay with site-specific mutants, viral attachment assay, JEV replication assay, MARCH5 knockout, IFN measurement, in vivo mouse virulence model\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific ubiquitination sites on viral protein identified by mutagenesis, linkage types determined, in vivo attenuation demonstrated, multiple methods\",\n      \"pmids\": [\"40071916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MARCH5 directly interacts with MIEF2 (mitochondrial fission factor) to mediate its ubiquitination and proteasomal degradation; MARCH5 overexpression reduces MIEF2 levels and reduces mitochondrial fission and fatty acid synthesis in alcoholic liver disease models; liver-specific MARCH5 knockdown worsens liver injury and abolishes gigantol-mediated protection.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, MARCH5/MIEF2 overexpression/knockdown, liver-specific KD mice, mitochondrial dynamics and metabolic assays\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, liver-specific in vivo knockdown model, single lab\",\n      \"pmids\": [\"41353882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MITOL/MARCH5 ubiquitinates Parkin at K220 downstream of DAPK1-mediated Parkin phosphorylation (at S136 and S198); DAPK1 phosphorylation promotes mitochondrial transport of Parkin, enhancing its interaction with MITOL and leading to Parkin degradation, increasing neuronal vulnerability.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation-site mutants (S136A, S198A), ubiquitination assay, MITOL interaction assay, 6-OHDA neurotoxicity model\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-site mutants, Co-IP, ubiquitination assay with functional neuronal readout, single lab\",\n      \"pmids\": [\"41943176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MARCH5 interacts with peroxisome biogenesis factor Pex26, facilitating transfer of newly synthesized Pex26 from the OMM to peroxisomes in peroxisome-containing cells; in peroxisome-deficient cells, MARCH5 targets Pex26 for p97-dependent proteasomal degradation via ubiquitination; Pex26 knockout causes accumulation of MARCH5/Tom20-positive pre-peroxisomes absent in Pex26/MARCH5 double KO cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Pex26 knockout, double knockout (Pex26/MARCH5), subcellular imaging, p97-dependency assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple KO models, Co-IP, ubiquitination assay, but preprint not yet peer-reviewed\",\n      \"pmids\": [\"42182360\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"MARCHF5/MITOL/MARCH5 is an outer mitochondrial membrane-resident RING-type E3 ubiquitin ligase that maintains mitochondrial and cellular homeostasis through ubiquitin-dependent regulation of a broad substrate repertoire: it controls mitochondrial dynamics by ubiquitinating Drp1 (regulating fission complex assembly/disassembly), MiD49 (targeting it for proteasomal degradation to limit fission), and Mfn1/Mfn2 (modulating fusion and ER-mitochondria contacts via K63- or degradative ubiquitination); it governs innate immune signaling by degrading MAVS aggregates and active RIG-I oligomers (K48-linked), activating TANK (K63-linked) to promote TLR7/NF-κB signaling, ubiquitinating NLRP3 (K27-linked at K324/K430) to enable inflammasome assembly, ubiquitinating STING to prevent inactive polymer formation, and degrading DNA-PKcs to limit mtDNA-triggered IFN responses; it regulates apoptosis by controlling MCL1 stability in a NOXA/MTCH2-dependent manner, ubiquitinating MIC60, and restraining BAK activating conformation changes; it mediates mitophagy and quality control through FUNDC1 degradation (K119), Parkin ubiquitination (K220), and facilitating Parkin recruitment via initial substrate ubiquitination for PINK1; it controls ER stress responses by K63-ubiquitinating IRE1α at K481 to prevent hyper-oligomerization; it supports peroxisome de novo biogenesis by transferring peroxins (Pex26, PMP70) from mitochondria-derived pre-peroxisomes; and it ubiquitinates additional substrates including mutant SOD1, polyQ-expanded ataxin-3, LC1, PolγA, RECQL4, Prkar1a, RMDN3, Trim28, MIEF2, MPC1, and RACGAP1 to regulate mitochondrial protein quality control, metabolism, and various cellular processes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MARCHF5 (MITOL/MARCH5) is a RING-type E3 ubiquitin ligase anchored in the mitochondrial outer membrane that maintains mitochondrial and cellular homeostasis by ubiquitinating a broad substrate repertoire [#0, #1]. Its central role is controlling mitochondrial dynamics: it ubiquitinates Drp1 and regulates its assembly/disassembly at fission sites [#0, #1], degrades the Drp1 receptor MiD49 and the fission factor MIEF2 to restrain fission [#10, #46], and ubiquitinates the fusion mediators Mfn1 (degradative, including cell-cycle- and acetylation-dependent control) and Mfn2 (K63-linked at K192 to drive oligomerization and ER–mitochondria tethering) [#3, #7, #8, #9]. MARCHF5 governs innate immune signaling, resolving MAVS aggregates and active RIG-I oligomers through K48-linked degradative ubiquitination to terminate antiviral signaling [#12, #20], activating TANK via K63-linked chains to promote NF-κB signaling [#5], and K27-ubiquitinating NLRP3 at K324/K430 to enable inflammasome assembly [#34]. It sets the apoptotic threshold by controlling MCL1 stability in a NOXA/MTCH2/UBE2K-dependent manner and by restraining BAK activating conformation changes [#15, #23, #31]. MARCHF5 directs mitochondrial quality control and mitophagy through hypoxia-induced FUNDC1 degradation at K119, Parkin ubiquitination at K220, K6-linked ubiquitination of the mtDNA import substrates PolγA and RECQL4, and K48-linked degradation of MIC60 [#16, #27, #28, #38, #39], and at the MAM it K63-ubiquitinates IRE1α at K481 to prevent hyper-oligomerization and limit RIDD-driven apoptosis [#18]. Beyond mitochondria, MARCHF5 localizes to peroxisomes via PEX19 and is essential for de novo peroxisome biogenesis, transferring peroxins such as Pex26 and ubiquitinating PMP70 [#26, #40, #48]. In vivo, MARCHF5 loss produces mitochondrial fragmentation, senescence, and heart failure, ferroptosis susceptibility, β-cell dysfunction via a Trim28/Kindlin-2/MafA axis, and cardiac hypertrophy through Akt signaling [#29, #30, #43, #44].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that MARCH5 is an outer mitochondrial membrane E3 ligase coupling ubiquitination to mitochondrial shape, answering whether a dedicated ligase regulates fission/fusion machinery.\",\n      \"evidence\": \"Reciprocal Co-IP, RING-mutant expression, and mitochondrial morphology imaging showing MFN2/Drp1 binding and Drp1 ubiquitination\",\n      \"pmids\": [\"16936636\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Linkage type and direct substrate sites on Drp1 not defined\", \"Whether Drp1 ubiquitination is degradative or regulatory unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed the RING domain controls Drp1 trafficking and assembly at fission sites, defining MARCH5 as a dynamic regulator rather than a constitutive degrader of Drp1.\",\n      \"evidence\": \"RING mutagenesis, RNAi, FRAP of YFP-Drp1, and rescue epistasis with Drp1 vs Fis1\",\n      \"pmids\": [\"17606867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular detail of how ubiquitination alters Drp1 mobility not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Mfn1 as a major degradative substrate and linked MARCH5 activity to suppression of mitochondrial elongation and cellular senescence.\",\n      \"evidence\": \"shRNA knockdown, GTPase-deficient Mfn1 rescue, SA-β-Gal senescence assay\",\n      \"pmids\": [\"20103533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination site on Mfn1 not mapped here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated MARCH5 acts in mitochondrial protein quality control by selectively ubiquitinating misfolded substrates (mutant SOD1), extending its role beyond dynamics.\",\n      \"evidence\": \"In vitro ubiquitination, cycloheximide chase, siRNA knockdown, ROS measurement\",\n      \"pmids\": [\"19741096\", \"20851218\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Recognition mechanism distinguishing misfolded from native substrates unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved how MARCH5 promotes ER–mitochondria contacts, showing non-degradative K63 ubiquitination of Mfn2 at K192 activates GTP-dependent oligomerization for MAM tethering.\",\n      \"evidence\": \"Domain-mapping mutagenesis, K63-linkage assay, blue-native PAGE, GTP binding/hydrolysis assays\",\n      \"pmids\": [\"23727017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MARCH5 switches between K63-regulatory and K48-degradative outputs not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined MARCH5 as a brake on antiviral signaling by degrading MAVS aggregates, linking mitochondrial ubiquitination to interferon control in vivo.\",\n      \"evidence\": \"Site-specific (K7/K500) ubiquitination assay, March5+/- mice, IFN and viral replication readouts\",\n      \"pmids\": [\"26246171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MARCH5 selectively recognizes aggregated vs monomeric MAVS not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended innate immune regulation to positive signaling and stem-cell biology, showing K63 ubiquitination of TANK promotes NF-κB and K63 ubiquitination of Prkar1a maintains pluripotency.\",\n      \"evidence\": \"Linkage-specific and site-specific ubiquitination assays, NF-κB reporter, PKA activity readouts, reprogramming assays\",\n      \"pmids\": [\"21625535\", \"26033541\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MARCH5 outputs are wired to opposing immune outcomes (activation vs termination) is unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified MiD49 as a degradative substrate and self-clearance via homodimerization, clarifying how MARCH5 limits fission and controls its own abundance.\",\n      \"evidence\": \"MARCH5/MiD49 double knockout epistasis, GxxxG dimerization mutants, cycloheximide chase\",\n      \"pmids\": [\"26564796\", \"26476016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative balance between MiD49 and Drp1 outputs in setting fission rate not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapped a degradation complex requiring the MARCH5 C-terminus, Mff, and p97/Npl4 for substrate release from the OMM, explaining the extraction step downstream of ubiquitination.\",\n      \"evidence\": \"Drp1/Mff knockout and double-knockout cells, Co-IP of complex components, half-life measurements\",\n      \"pmids\": [\"27932492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of substrate handoff to p97 not determined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established MARCH5 as the principal regulator of MCL1 stability in a NOXA/MTCH2/UBE2K-dependent manner, defining an apoptotic threshold relevant to BH3-mimetic resistance.\",\n      \"evidence\": \"Chemical/genetic MARCH5 perturbation, genome-wide CRISPR screen, NOXA-dependency, MCL1 ubiquitination/stability assays\",\n      \"pmids\": [\"26910119\", \"32094511\", \"32484436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NOXA binding licenses MCL1 for MARCH5 recognition mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected antiviral signaling to mitophagy regulation: PKAC-mediated MAVS phosphorylation primes K48 degradation, and hypoxia-induced FUNDC1 ubiquitination at K119 fine-tunes mitophagy.\",\n      \"evidence\": \"Phospho-site (T54A) and K119 site-specific mutants, linkage-specific ubiquitination, mitophagy flux assays\",\n      \"pmids\": [\"28934360\", \"28104734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial coordination of these stress-specific substrate choices not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined MARCH5 control of the ER stress response and mitophagy initiation, K63-ubiquitinating IRE1α at K481 to limit RIDD and providing the initial ubiquitin substrate for PINK1/Parkin recruitment.\",\n      \"evidence\": \"K481R and linkage-specific assays, MITOL KO cells and mice, RIDD activity, Parkin recruitment assays\",\n      \"pmids\": [\"31368599\", \"31110043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the initial PINK1-phosphorylated ubiquitin substrate provided by MARCH5 not pinpointed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended antiviral termination to direct degradation of active RIG-I oligomers, establishing dual RIG-I/MAVS targeting to switch off RLR signaling.\",\n      \"evidence\": \"K48-linkage site-specific (K193/K203) ubiquitination, proteasome rescue, oligomer analysis\",\n      \"pmids\": [\"31881323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temporal sequence of RIG-I vs MAVS targeting during infection not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed MARCH5 dual localization to peroxisomes via PEX19 and its role in PMP70 ubiquitination and pexophagy, broadening its organellar reach.\",\n      \"evidence\": \"PUP-IT proximity tagging, Co-IP, MARCH5 KO, pexophagy assays\",\n      \"pmids\": [\"34747980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants directing MARCH5 to peroxisomes vs mitochondria not defined here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined MARCH5 control over mtDNA maintenance and mitophagy fine-tuning via K6-linked ubiquitination of PolγA (K1060) and Parkin (K220), gating mitochondrial import and Parkin turnover.\",\n      \"evidence\": \"In vitro and K6-linkage-specific ubiquitination, site-specific mutants, Tom20 binding and mtDNA replication assays, PEO/patient mutant analysis\",\n      \"pmids\": [\"33657094\", \"33565245\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How K6 linkage is decoded to block Tom20-mediated import mechanistically unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked MARCH5 to cardiac homeostasis in vivo, showing its loss causes Drp1-driven fragmentation, senescence, heart failure, and ferroptosis susceptibility via reduced mitochondrial GPX4.\",\n      \"evidence\": \"Cardiomyocyte-specific conditional KO mice, MI and doxorubicin models, AAV rescue, GSH/GSSG and lipid peroxidation assays\",\n      \"pmids\": [\"35789860\", \"34390730\", \"33970775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ferroptosis protection is direct GPX4 regulation or secondary to dynamics unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established MARCH5 restrains BAK activating conformation independently of BH3-only proteins, defining an apoptosis-suppressive function beyond MCL1 turnover.\",\n      \"evidence\": \"Genome-wide CRISPR screen, multiple cell lines, BAK conformation and BH3-mimetic response assays\",\n      \"pmids\": [\"36171332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BAK restraint is via direct ubiquitination or indirect not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanded immune regulation to NLRP3 inflammasome and STING control, with K27 ubiquitination enabling NLRP3-NEK7 assembly and STING ubiquitination preventing oxidation-induced inactive polymers.\",\n      \"evidence\": \"Site-specific (K324/K430) K27-linkage assays, myeloid conditional KO mice, STING polymer/ROS analyses\",\n      \"pmids\": [\"37575012\", \"37916870\", \"38040710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How K27 chains are decoded to template inflammasome oligomerization is unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Added MIC60 (K48 at K285), RECQL4 (K6 at K1101/K1154), and γc cytokine receptor (K27) as substrates, linking MARCH5 to cristae integrity, mtDNA import, and T-cell cytokine signaling.\",\n      \"evidence\": \"Site-specific linkage assays, TRAP1 competition, RTS patient mutants, PD-1/BATF-dependent γc degradation\",\n      \"pmids\": [\"37679468\", \"37495109\", \"37932447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coordination of these distinct linkage outputs on different substrates not unified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established an essential role in de novo peroxisome biogenesis from mitochondria, with MARCH5 acting upstream of Pex14 and degrading MPC1 to promote glycolysis.\",\n      \"evidence\": \"Multiple/double KO epistasis (Pex14, Pex3), fatty-acid-induced biogenesis, activity-mutant accumulation on pre-peroxisomes, metabolic OCR/ECAR assays\",\n      \"pmids\": [\"39423819\", \"39423820\", \"38615083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrates ubiquitinated during the mitochondrial steps of biogenesis incompletely defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined an in vivo β-cell signaling axis (Trim28/Kindlin-2/MafA) and cardiac hypertrophy via Akt, plus K27 ubiquitination of JEV envelope protein, broadening MARCH5 into endocrine, cardiac, and viral-host contexts.\",\n      \"evidence\": \"β-cell and cardiac conditional/heterozygous KO mice, epistasis rescue, Co-IP, site-specific viral E-protein ubiquitination assays\",\n      \"pmids\": [\"40750777\", \"40753540\", \"40071916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Akt phosphorylation enhancement is direct or via a substrate intermediary unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked DAPK1-mediated Parkin phosphorylation to MARCH5-dependent Parkin degradation in neurotoxicity, integrating phospho-signaling with the K220 ubiquitination event.\",\n      \"evidence\": \"Phospho-site mutants (S136A/S198A), Co-IP, ubiquitination assay, 6-OHDA neurotoxicity model\",\n      \"pmids\": [\"41943176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; how phosphorylation directs Parkin to MITOL not structurally defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MARCH5 selects among dozens of substrates and assembles distinct ubiquitin linkage types (K6, K27, K48, K63) with opposing regulatory vs degradative outcomes at specific subcellular sites remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying substrate-recognition or linkage-determination model\", \"Structural basis for linkage-type specificity unknown\", \"Coordination of mitochondrial vs peroxisomal pools not mechanistically defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 8, 12, 16, 28, 34, 39]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 6, 8, 10, 16, 28, 38, 39]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 12, 34]},\n      {\"term_id\": \"GO:0061630\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [26, 40, 48]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8, 18, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 3, 10, 40]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 12, 20, 34, 36, 37]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [15, 23, 24, 31]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16, 19, 27, 26]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 39, 28, 38]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [\n      \"MARCH5/p97/Npl4 degradation complex\",\n      \"MARCH5 homodimer\"\n    ],\n    \"partners\": [\n      \"DRP1\",\n      \"MFN1\",\n      \"MFN2\",\n      \"MAVS\",\n      \"MCL1\",\n      \"FUNDC1\",\n      \"MTCH2\",\n      \"MID49\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}