{"gene":"MFF","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2008,"finding":"MFF is a tail-anchored protein of the mitochondrial outer membrane that controls mitochondrial fission; siRNA knockdown causes a closed mitochondrial network phenotype similar to Drp1/Fis1 knockdown, and MFF and Fis1 exist in separate ~200 kDa complexes, suggesting distinct roles in fission. MFF knockdown also inhibits peroxisomal fission.","method":"siRNA screen in Drosophila cells, human cell siRNA knockdown, co-immunoprecipitation/size-exclusion to distinguish MFF and Fis1 complexes, mitochondrial/peroxisomal morphology assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — foundational discovery paper with multiple orthogonal methods (RNAi, morphology, fractionation) and independent replication across species","pmids":["18353969"],"is_preprint":false},{"year":2010,"finding":"MFF is an essential mitochondrial outer membrane receptor for Drp1 recruitment: MFF knockdown releases Drp1 foci from the MOM with network extension; overexpression stimulates Drp1 recruitment and fission; MFF and Drp1 physically interact in vitro and in vivo; MFF-dependent fission is independent of Fis1; retargeting MFF to the plasma membrane via a CAAX motif redirects Drp1 to that membrane; MFF knockdown compromises stimulus-induced fission and apoptosis.","method":"siRNA knockdown, overexpression, in vitro and in vivo co-immunoprecipitation/pulldown, CAAX membrane-retargeting assay, apoptosis assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods including in vitro binding assay, in vivo Co-IP, genetic retargeting, and functional rescue; independently replicated","pmids":["21149567"],"is_preprint":false},{"year":2013,"finding":"Both MFF and Fis1 contribute to Drp1 recruitment and mitochondrial fission; MFF-null and Fis1-null cells each show reduced Drp1 puncta size/number on mitochondria; MiD49 and MiD51 can independently mediate Drp1 recruitment and fission in the absence of both Fis1 and Mff.","method":"Gene knockout cell lines (Fis1-null, Mff-null, Fis1/Mff-null), immunofluorescence of Drp1 puncta, mitochondrial morphology analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean null cell lines with defined phenotypic readout; independently consistent with prior work","pmids":["23283981"],"is_preprint":false},{"year":2013,"finding":"MFF functions with Pex11pβ and DLP1 (Drp1) in peroxisomal fission: endogenous MFF localizes to peroxisomal membrane-constricted regions; MFF knockdown abolishes the fission stage of peroxisomal division and prevents DLP1 recruitment to peroxisomes; MFF overexpression increases DLP1 peroxisomal targeting and increases Pex11pβ–DLP1 interaction; Pex11pβ interacts with Mff in a DLP1-dependent manner.","method":"siRNA knockdown, overexpression, co-immunoprecipitation, immunofluorescence localization","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and localization with functional knockdown, single lab","pmids":["24167709"],"is_preprint":false},{"year":2015,"finding":"MFF selectively binds oligomerized (higher-order) Drp1 but not assembly-deficient Drp1 mutants; the insert B region of Drp1 inhibits Mff–Drp1 interaction; recombinant Drp1 lacking insert B forms a stable complex with Mff; in contrast, MiD51/MiD49 can recruit Drp1 dimers, explaining divergent outcomes of overexpression.","method":"Genetic and biochemical assays with recombinant proteins, pulldown with assembly-deficient Drp1 mutants, in vitro binding","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab but multiple orthogonal approaches","pmids":["26446846"],"is_preprint":false},{"year":2015,"finding":"Mff-deficient mice develop lethal dilated cardiomyopathy with reduced mitochondrial density and respiratory chain activity and increased mitophagy; concurrent deletion of the fusion gene Mfn1 completely rescues heart dysfunction, lifespan, and respiratory chain function, demonstrating that rebalancing fission/fusion restores organ physiology.","method":"Mouse knockout and double-knockout genetics, cardiac function assessment, electron microscopy, respiratory chain activity assay, mitophagy markers","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo double-knockout epistasis with multiple orthogonal phenotypic readouts","pmids":["26598616"],"is_preprint":false},{"year":2015,"finding":"The phosphorylation status of Drp1 at Ser637 is essential for its interaction with Mff; UV irradiation reduces cytoplasmic and mitochondrial Drp1 Ser637 phosphorylation and enhances the Drp1–Mff interaction, leading to mitochondrial fragmentation; Mff-mediated Drp1 recruitment does not require Bax.","method":"UV irradiation apoptosis model, co-immunoprecipitation of Drp1 and Mff, phospho-Drp1 western blot, Bax-null cell experiments","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with phosphorylation site analysis, single lab","pmids":["26432782"],"is_preprint":false},{"year":2015,"finding":"Parkin ubiquitinates Mff at lysine 251 upon mitochondrial depolarization; K251R mutation abolishes Parkin-stimulated ubiquitination; ubiquitinated Mff promotes association with the autophagic adapter p62/SQSTM1; Mff knockout impairs p62 translocation to damaged mitochondria and Parkin translocation, blocking mitophagy clearance.","method":"CCCP-induced mitochondrial depolarization, co-immunoprecipitation, site-directed mutagenesis (K251R), Mff knockout rescue experiments, immunofluorescence","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus Co-IP plus KO rescue, single lab","pmids":["26008206"],"is_preprint":false},{"year":2016,"finding":"MiD51 suppresses Mff-dependent enhancement of Drp1 GTPase activity; proximity-based biotin labeling (BioID) shows close associations between MiD51, Mff, and Drp1 but not Fis1; combined loss of MiD51 and Mff further enhances mitochondrial connectivity compared to single knockouts.","method":"CRISPR/Cas9 gene editing, BioID proximity labeling, Drp1 GTPase activity assay, mitochondrial morphology analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical GTPase assay plus proximity labeling plus clean CRISPR knockouts; multiple orthogonal methods","pmids":["27076521"],"is_preprint":false},{"year":2016,"finding":"Mff and Drp1 negatively regulate MARCH5 E3 ubiquitin ligase activity toward MiD49 and Mcl1; Mff knockout leads to reduced expression, shorter half-lives, and increased ubiquitination of MiD49 and Mcl1 via MARCH5; Mff is an integral component of the MARCH5/p97/Npl4 complex.","method":"Mff and Drp1 knockout cells, MARCH5 knockout double-mutant cells, protein half-life assays, ubiquitination assays, co-immunoprecipitation of MARCH5/p97/Npl4/Mff complex","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and double-KO epistasis, single lab","pmids":["27932492"],"is_preprint":false},{"year":2017,"finding":"SENP3-mediated deSUMOylation of Drp1 promotes Drp1 binding to Mff on the mitochondrial outer membrane; preventing Drp1 SUMOylation (SUMO-site mutant) enhances Mff binding; knocking down SENP3 reduces Drp1–Mff interaction and stress-induced cytochrome c release; directly tethering Drp1 to the MOM bypasses the need for Mff and occludes the SENP3 effect.","method":"SENP3 overexpression/knockdown, SUMO-site Drp1 mutants, co-immunoprecipitation, cytochrome c release assay, Drp1 MOM-tethering construct","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus Co-IP plus functional tethering bypass, single lab","pmids":["28262828"],"is_preprint":false},{"year":2018,"finding":"CK2α phosphorylates MFF downstream of NR4A1 activation during cardiac microvascular IR injury; phosphorylated MFF enhances cytoplasmic Drp1 translocation to mitochondria, causing fatal mitochondrial fission.","method":"NR4A1 knockout mice, in vitro endothelial cell model, CK2α inhibitor, western blot for phospho-Mff, immunofluorescence for Drp1 translocation","journal":"Basic research in cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout plus kinase inhibitor validation, single lab","pmids":["29744594"],"is_preprint":false},{"year":2018,"finding":"MFF overexpression forms homo- and heterodimeric complexes with VDAC1 via key contact residues (Arg225, Arg236, Gln241); a cell-permeable MFF peptidomimetic disrupts the MFF-VDAC1 complex, acutely depolarizes mitochondria, and triggers cell death in tumor but not normal cells.","method":"Co-immunoprecipitation, mutational analysis of contact residues, peptidomimetic functional assay, mitochondrial membrane potential assay, in vitro cell death assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutational mapping and functional peptidomimetic, single lab","pmids":["31582380"],"is_preprint":false},{"year":2018,"finding":"MFF is required for axonal mitochondrial size maintenance: MFF downregulation in cortical pyramidal neurons increases presynaptic mitochondrial size, augments mitochondrial Ca2+ uptake during neurotransmission, reduces presynaptic Ca2+ accumulation, decreases neurotransmitter release, and reduces terminal axon branching; MFF does not affect mitochondrial trafficking, presynaptic capture, membrane potential, or ATP generation.","method":"In vitro and in vivo MFF knockdown in cortical neurons, live imaging of mitochondria and Ca2+, electrophysiology/release assays, axon branching quantification","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro and in vivo loss-of-function with multiple specific functional readouts; defined mechanistic pathway","pmids":["30479337"],"is_preprint":false},{"year":2019,"finding":"Parkin ubiquitinates Mff in a PINK1-dependent manner under non-stressed (basal) conditions to regulate constitutive Mff turnover; shRNA-mediated Parkin knockdown does not completely prevent basal Mff ubiquitination, indicating at least one additional ubiquitin ligase contributes to Mff proteostasis.","method":"Parkin/PINK1 shRNA knockdown, ubiquitination assays under non-stressed conditions, protein turnover assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA knockdown with ubiquitination assay, single lab","pmids":["31112535"],"is_preprint":false},{"year":2020,"finding":"MAVS is activated by Mff through formation of active MAVS clusters on mitochondria, independent of mitochondrial fission and Drp1; under mitochondrial dysfunction, AMPK phosphorylates Mff, leading to disorganization of MAVS clusters and repression of the acute antiviral response; Mff also contributes to immune tolerance during chronic infection by disrupting mitochondrial MAVS clusters.","method":"Cell culture overexpression/knockdown, AMPK activation/inhibition, MAVS clustering assays, antiviral signaling readouts, Drp1-independent assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (clustering assay, AMPK manipulation, Drp1 independence test, antiviral functional assay), single lab","pmids":["33177519"],"is_preprint":false},{"year":2020,"finding":"Pum2 (RNA-binding protein) negatively regulates Mff mRNA translation; in ischemic AKI, Pum2 is downregulated, inversely correlating with Mff upregulation; Pum2 overexpression reduces Mff protein levels and protects against mitochondrial fission-dependent renal injury.","method":"Mff genetic deletion mouse model, Pum2 overexpression, western blot for Pum2/Mff correlation, ischemic AKI mouse model","journal":"Cell biology and toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic deletion plus overexpression with defined phenotypic readout, single lab","pmids":["31993882"],"is_preprint":false},{"year":2021,"finding":"Mff is an oligomer (most likely trimer) that dynamically associates/disassociates through its C-terminal coiled-coil (Kd ~10 µM); dynamic Mff oligomerization is required for Drp1 activation; actin filaments enhance Mff-mediated Drp1 activation by lowering the effective Mff concentration ~10-fold; Mff interacts with Drp1 on actin filaments in an oligomerization-dependent manner; oligomerization-defective Mff fails to rescue mitochondrial/peroxisome division, Drp1 recruitment, or Mff puncta formation in Mff-KO cells.","method":"In vitro reconstitution with purified proteins, TIRF microscopy, Drp1 GTPase activation assay, Mff-KO rescue with oligomerization-defective mutants, U2OS cell division/morphology assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, TIRF imaging, GTPase assay, and cell-based rescue experiments with structure-function mutants","pmids":["34347505"],"is_preprint":false},{"year":2021,"finding":"PKD (Protein Kinase D) directly phosphorylates MFF specifically during mitosis; PKD-dependent MFF phosphorylation is required and sufficient for mitochondrial fission in mitotic but not interphase cells; MFF phosphorylation is crucial for chromosome segregation and cell survival by inhibiting adaptation of the mitotic checkpoint.","method":"In vitro kinase assay, phospho-MFF site identification, PKD inhibition/overexpression, mitosis-specific cell imaging, chromosome segregation assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct kinase assay with functional mitotic phenotype, single lab with multiple methods","pmids":["34010649"],"is_preprint":false},{"year":2021,"finding":"Mff primes Drp1 binding to Bcl-xL at mitochondria; Mff and Bcl-xL can interact directly, independent of Drp1, through their transmembrane domains; SENP3-mediated deSUMOylation of Drp1 promotes the Drp1–Bcl-xL interaction; recovery of SENP3 after OGD/reoxygenation promotes the Drp1–Bcl-xL interaction and cell death.","method":"Co-immunoprecipitation, in vitro binding assays, SUMO-site Drp1 mutants, OGD model, Bcl-xL mutant with defective Drp1 binding","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vitro binding plus mutagenesis, single lab","pmids":["34722538"],"is_preprint":false},{"year":2021,"finding":"Mff preferentially binds higher-order oligomers of Drp1, while MIEFs bind a wider range of Drp1 assembly states including lower oligomers; forced Drp1 recruitment by either Mff or MIEFs facilitates Drp1 oligomerization on mitochondria; MIEFs serve as a platform facilitating Drp1 binding to Mff, and loss of MIEFs severely impairs Drp1–Mff interaction.","method":"In vivo chemical crosslinking, co-immunoprecipitation with oligomerization and GTPase-deficient Drp1 mutants, Mff/MIEF1/2-deficient cell lines","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical crosslinking plus Co-IP with mutants, single lab","pmids":["34805137"],"is_preprint":false},{"year":2022,"finding":"Human HCMV vMIA inhibits MAVS oligomerization at peroxisomes in an MFF-dependent manner; vMIA is totally dependent on MFF (the organelle fission machinery) to induce peroxisomal fragmentation, while this dependency is not observed at mitochondria; vMIA interacts with MAVS at peroxisomes and inhibits its oligomerization.","method":"HCMV infection, vMIA expression, MFF knockdown/knockout, MAVS oligomerization assay, peroxisomal and mitochondrial morphology analysis","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function plus MAVS functional assay, single lab","pmids":["35445031"],"is_preprint":false},{"year":2023,"finding":"CPT1A promotes succinylation of MFF at lysine 302 (K302) through its lysine succinyltransferase (LSTase) activity; K302 succinylation protects MFF against Parkin-mediated ubiquitin-proteasomal degradation; elevated MFF succinylation promotes mitochondrial fission and ovarian cancer cell growth.","method":"CPT1A overexpression/knockdown, mass spectrometry identification of K302 succinylation site, site-directed mutagenesis, MFF protein stability assay with Parkin, in vivo tumor model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — PTM site identification by MS, mutagenesis, and functional rescue, single lab","pmids":["37291333"],"is_preprint":false},{"year":2024,"finding":"MFF is SUMOylated at Lys151; MFF SUMOylation is enhanced following AMPK-mediated phosphorylation; MFF SUMOylation regulates the level of MiD (MiD49/51) binding to MFF in the trimeric DRP1-MiD-MFF complex; CCCP-induced mitochondrial fragmentation is impaired in MFF-KO MEFs expressing non-SUMOylatable MFF K151R, demonstrating that AMPK→MFF SUMOylation dynamically controls stress-induced fragmentation by modulating MiD levels in fission complexes.","method":"Site-directed mutagenesis (K151R), SUMO assay, AMPK activation, MFF-KO MEF rescue, CCCP treatment, co-immunoprecipitation for MiD–MFF interaction","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis, KO rescue, and Co-IP with multiple orthogonal approaches, single lab","pmids":["39365854"],"is_preprint":false},{"year":2024,"finding":"FMRP granules are recruited to the mitochondrial midzone (fission sites) in axons and dendrites; FMRP promotes local translation of MFF at mitochondria-associated ribosome-rich granules, specifically enabling replicative fission at the mitochondrial midzone; disrupting FMRP function dysregulates MFF translation and causes increased peripheral fission and irregular mitochondrial nucleoid distribution.","method":"Cryo-electron tomography, real-time translation imaging, FMRP granule live imaging, FMRP loss-of-function, mitochondrial fission site imaging, nucleoid distribution assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-ET plus real-time translation imaging plus loss-of-function, multiple orthogonal methods","pmids":["39548330"],"is_preprint":false},{"year":2024,"finding":"Mouse Mff has tissue-specific alternative splicing; insertion of exon 6 just after the AMPK phosphorylation site reduces AMPK-mediated Mff phosphorylation and impairs both mitochondrial fission and MAVS-dependent antiviral response functions; this splicing effect is independent of phosphorylation per se.","method":"Splice isoform introduction into Mff-KO MEFs, AMPK phosphorylation assay, mitochondrial fission assay, antiviral signaling assay","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform rescue in KO cells with phosphorylation and functional assays, single lab","pmids":["39293584"],"is_preprint":false},{"year":2026,"finding":"MFF is trafficked between mitochondria and melanosomes and localizes at melanosome fission events; MFF downregulation (but not DRP1 knockdown) causes melanosome enlargement, intracellular melanin accumulation, and increased lumenal catabolism; MFF interacts with regulators of the ARP2/3 complex; actin filaments accumulate between melanosomes at MFF-enriched constriction sites; ARP2/3 subunit silencing mimics MFF loss, indicating MFF mediates actin-dependent melanosome fission independently of DRP1.","method":"MFF downregulation, DRP1 knockdown comparison, live imaging of MFF trafficking, immunofluorescence at fission sites, ARP2/3 co-immunoprecipitation, ARP2/3 knockdown phenocopy","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple KD experiments with defined phenotypes and Co-IP for ARP2/3 interaction, single study","pmids":["41832149"],"is_preprint":false},{"year":2022,"finding":"MFF-insufficiency (siRNA) in dopaminergic neurons causes impaired neurite outgrowth, mitochondrial Ca2+ accumulation via accelerated Ca2+ influx from the ER through the InsP3R, excessive mitochondrial ROS production, and downregulation of PGC-1α; MFF co-immunoprecipitates with VDAC1, an essential component of the ER-mitochondrial Ca2+ transport system, suggesting MFF negatively regulates mitochondrial Ca2+ influx from the ER.","method":"MFF siRNA in stem cell-derived dopaminergic neurons, Ca2+ imaging, ROS measurement, co-immunoprecipitation of MFF and VDAC1, neurite outgrowth assay","journal":"Antioxidants","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional RNAi with multiple readouts, single lab","pmids":["35883852"],"is_preprint":false},{"year":2019,"finding":"Bcl-xL interacts with Mff to form heterogeneous oligomers with 1:2 stoichiometry in cytoplasm and 1:1 stoichiometry on mitochondria; Bcl-xL coexpression reconstructs the Mff network from punctate higher-order oligomers to filamentous lower-order oligomers; Bcl-xL inhibits Mff-mediated mitochondrial fragmentation and apoptosis.","method":"Live-cell FRET two-hybrid assay, fluorescence microscopy, oligomer distribution analysis","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET-based interaction assay with stoichiometry analysis, single lab","pmids":["31587505"],"is_preprint":false},{"year":2020,"finding":"Mcl-1 inhibits Mff-mediated mitochondrial fragmentation and apoptosis; however, Mcl-1 does NOT directly bind to Mff on mitochondria (negative finding confirmed by FRET analysis in live cells).","method":"Live-cell co-expression, FRET efficiency measurement, mitochondrial morphology and apoptosis assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET and functional assay; negative result for direct binding is itself mechanistically informative, single lab","pmids":["31941601"],"is_preprint":false},{"year":2025,"finding":"TRIM21 E3 ubiquitin ligase mediates ubiquitination and proteasomal degradation of MFF; ciprofloxacin exposure upregulates TRIM21, promotes TRIM21-mediated MFF degradation, and the resulting reduction in MFF causes mitochondrial dysfunction and cell senescence in trophoblasts.","method":"Co-immunoprecipitation of TRIM21-MFF, ubiquitination assay, TRIM21 overexpression/knockdown, MFF rescue experiments","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, and functional rescue, single lab","pmids":["41650744"],"is_preprint":false}],"current_model":"MFF is a tail-anchored mitochondrial (and peroxisomal) outer membrane protein that functions as the principal receptor for cytosolic Drp1, selectively recruiting higher-order Drp1 oligomers via a dynamic trimeric Mff scaffold whose assembly depends on its C-terminal coiled-coil; Mff-mediated Drp1 activation is synergistically enhanced by actin filaments, is regulated by AMPK-dependent phosphorylation (promoting fission), PKD-dependent phosphorylation (mitosis-specific fission), Parkin-dependent ubiquitination (constitutive turnover and mitophagy), SENP3-mediated deSUMOylation of Drp1 (enhancing Mff–Drp1 binding), SUMO modification of Mff itself at K151 (controlling MiD levels in the trimeric DRP1–MiD–MFF complex), and lysine succinylation at K302 (protecting against Parkin-mediated degradation); beyond canonical fission, Mff also nucleates active MAVS signaling clusters on mitochondria for antiviral immunity, participates in a MARCH5/p97/Npl4 ubiquitin-ligase complex to control MiD49 and Mcl1 stability, mediates actin/ARP2/3-dependent melanosome fission independently of Drp1, and locally translated MFF in neurons is regulated by FMRP to control compartment-specific mitochondrial size and presynaptic calcium/neurotransmitter release."},"narrative":{"mechanistic_narrative":"MFF is a tail-anchored protein of the mitochondrial and peroxisomal outer membrane that serves as the principal receptor for the cytosolic GTPase Drp1, driving organelle fission [PMID:18353969, PMID:21149567, PMID:24167709]. It functions as a dynamic oligomer—most likely a trimer—whose self-association through a C-terminal coiled-coil is required to activate Drp1, with actin filaments enhancing this activation by concentrating the machinery [PMID:34347505]. MFF selectively engages higher-order, assembly-competent Drp1 oligomers rather than dimers, a selectivity that distinguishes it from the MiD49/MiD51 receptors with which it co-assembles into a trimeric DRP1–MiD–MFF fission complex [PMID:26446846, PMID:34805137, PMID:39365854]. Drp1 recruitment to MFF is gated by Drp1 modification state: Ser637 dephosphorylation and SENP3-mediated deSUMOylation of Drp1 both promote the MFF–Drp1 interaction and downstream cytochrome c release and apoptosis [PMID:26432782, PMID:28262828]. MFF activity is itself tuned by a layered post-translational code—AMPK phosphorylation and the consequent SUMOylation at Lys151 controlling MiD levels in the fission complex during stress [PMID:39365854], PKD phosphorylation driving mitosis-specific fission needed for chromosome segregation [PMID:34010649], Parkin/PINK1 ubiquitination governing both constitutive turnover and mitophagic clearance of damaged mitochondria [PMID:26008206, PMID:31112535], and CPT1A-dependent succinylation at Lys302 protecting MFF from Parkin-mediated degradation [PMID:37291333]. Physiologically, balanced MFF-driven fission is essential: its loss in mice causes lethal dilated cardiomyopathy rescued by concurrent ablation of the fusion gene Mfn1 [PMID:26598616], and in neurons FMRP-controlled local translation of MFF sets compartment-specific mitochondrial size and presynaptic calcium handling and neurotransmitter release [PMID:30479337, PMID:39548330]. Beyond canonical fission, MFF nucleates active MAVS clusters on mitochondria for antiviral signaling independently of Drp1 [PMID:33177519], participates in a MARCH5/p97/Npl4 ubiquitin-ligase complex controlling MiD49 and Mcl1 stability [PMID:27932492], and mediates actin/ARP2/3-dependent melanosome fission independently of DRP1 [PMID:41832149].","teleology":[{"year":2008,"claim":"Established MFF as a distinct, dedicated component of the mitochondrial fission machinery, separating it from the previously known Fis1/Drp1 pathway.","evidence":"RNAi in Drosophila and human cells with morphology and size-exclusion fractionation showing MFF and Fis1 in separate complexes","pmids":["18353969"],"confidence":"High","gaps":["Did not define how MFF promotes fission molecularly","Relationship to Drp1 recruitment unresolved","Peroxisomal role noted but not mechanistically dissected"]},{"year":2010,"claim":"Identified MFF as an essential outer-membrane receptor that physically recruits Drp1 to mitochondria, defining the receptor logic of fission.","evidence":"siRNA/overexpression, in vitro and in vivo Co-IP, and CAAX membrane-retargeting redirecting Drp1 to the plasma membrane","pmids":["21149567"],"confidence":"High","gaps":["Did not explain selectivity for Drp1 assembly states","Stoichiometry/oligomeric state of MFF unknown","Did not resolve overlap with Fis1 and MiD receptors"]},{"year":2013,"claim":"Resolved the redundancy among Drp1 receptors, showing MFF, Fis1, and the MiD proteins each contribute to Drp1 recruitment, and extended MFF function to peroxisomal division.","evidence":"Single and combinatorial knockout cell lines with Drp1 puncta quantification; reciprocal Co-IP and localization at peroxisomal constrictions","pmids":["23283981","24167709"],"confidence":"Medium","gaps":["Quantitative hierarchy among receptors not established","Peroxisomal Pex11pβ–MFF Co-IP from single lab","Mechanism of constriction-site targeting unknown"]},{"year":2015,"claim":"Defined the molecular basis of MFF–Drp1 selectivity and demonstrated physiological necessity of MFF-driven fission in vivo.","evidence":"In vitro binding with assembly-deficient Drp1 and insert-B mutants; mouse Mff/Mfn1 double-knockout cardiac epistasis; UV-apoptosis Co-IP linking Drp1 Ser637 dephosphorylation to binding","pmids":["26446846","26598616","26432782"],"confidence":"High","gaps":["Structural details of the higher-order-oligomer interface not solved","How fission/fusion imbalance kills cardiomyocytes mechanistically unclear","Upstream kinase/phosphatase controlling Ser637 in this context not defined"]},{"year":2015,"claim":"Linked MFF to the Parkin/PINK1 mitophagy axis, showing MFF ubiquitination couples fission machinery to autophagic clearance.","evidence":"CCCP depolarization, K251R mutagenesis, p62 translocation assays, and Mff knockout rescue","pmids":["26008206"],"confidence":"Medium","gaps":["Single-lab Co-IP/mutagenesis","Whether ubiquitination acts via turnover or adaptor recruitment not fully separated","Other contributing ligases not identified at this stage"]},{"year":2016,"claim":"Placed MFF within a regulatory network with MiD51 and the MARCH5 ubiquitin-ligase complex, showing MFF both is regulated by and regulates fission-complex protein stability.","evidence":"CRISPR knockouts, BioID proximity labeling, Drp1 GTPase assays, protein half-life/ubiquitination measurements, and MARCH5/p97/Npl4 Co-IP","pmids":["27076521","27932492"],"confidence":"Medium","gaps":["MARCH5 complex stoichiometry and direct contacts undefined","How MFF restrains MARCH5 activity mechanistically unclear","Single-lab epistasis for stability control"]},{"year":2017,"claim":"Showed that Drp1 SUMO state, controlled by SENP3, gates the MFF–Drp1 interaction and stress-induced apoptosis.","evidence":"SENP3 manipulation, Drp1 SUMO-site mutants, Co-IP, cytochrome c release, and MOM-tethering bypass","pmids":["28262828"],"confidence":"Medium","gaps":["Single-lab Co-IP evidence","Direct contribution of SUMO to binding interface not structurally resolved","Physiological trigger of SENP3 activation here not defined"]},{"year":2018,"claim":"Expanded MFF regulation and function to phospho-control of pathological fission, neuronal mitochondrial sizing, and a Drp1-independent VDAC1 interaction exploitable in cancer.","evidence":"CK2α/NR4A1 cardiac IR model; neuronal MFF knockdown with Ca2+ imaging and release electrophysiology; VDAC1 Co-IP with peptidomimetic disruption","pmids":["29744594","30479337","31582380"],"confidence":"Medium","gaps":["VDAC1 interaction and its physiological role only partly mapped","Neuronal phenotype mechanism downstream of size not fully traced","CK2α phospho-site on MFF not pinned to structure"]},{"year":2019,"claim":"Established that Parkin ubiquitinates MFF under basal conditions for constitutive turnover, while implicating Bcl-xL as a direct MFF partner restraining fission.","evidence":"Parkin/PINK1 shRNA with basal ubiquitination/turnover assays; FRET two-hybrid showing Bcl-xL–MFF oligomer stoichiometry and network remodeling","pmids":["31112535","31587505"],"confidence":"Medium","gaps":["Additional basal MFF ligase(s) not identified","Bcl-xL–MFF interface and its in vivo relevance undefined","Single-lab FRET stoichiometry"]},{"year":2020,"claim":"Uncovered a fission-independent role for MFF as a platform that nucleates antiviral MAVS clusters, gated by AMPK phosphorylation, plus translational and apoptotic regulators of MFF.","evidence":"MAVS clustering assays with Drp1-independence tests and AMPK manipulation; Pum2 translational repression in ischemic AKI; Mcl-1 FRET showing functional inhibition without direct binding","pmids":["33177519","31993882","31941601"],"confidence":"High","gaps":["How AMPK phosphorylation reorganizes MAVS clusters structurally unknown","Mcl-1 acts on MFF function indirectly by an undefined route","Pum2–MFF mRNA regulation mechanism not detailed"]},{"year":2021,"claim":"Defined MFF's dynamic oligomeric mechanism and its actin synergy, and added PKD-driven mitotic phosphorylation and Bcl-xL/SENP3 apoptotic coupling.","evidence":"In vitro reconstitution with TIRF and GTPase assays and oligomerization-defective rescue; in vitro PKD kinase assays with mitotic phenotyping; Co-IP/in vitro binding for MFF–Bcl-xL priming of Drp1; crosslinking analysis of Drp1 assembly-state binding by MFF versus MIEFs","pmids":["34347505","34010649","34722538","34805137"],"confidence":"High","gaps":["Atomic structure of the trimeric scaffold lacking","How actin physically lowers effective MFF concentration unresolved","PKD phospho-site structural consequence not defined"]},{"year":2022,"claim":"Linked MFF to ER–mitochondrial Ca2+ handling in dopaminergic neurons and to peroxisomal MAVS control hijacked by viral immune evasion.","evidence":"MFF siRNA in dopaminergic neurons with Ca2+/ROS imaging and VDAC1 Co-IP; HCMV vMIA with MFF-dependent peroxisomal MAVS oligomerization assays","pmids":["35883852","35445031"],"confidence":"Medium","gaps":["Whether VDAC1 binding directly mediates Ca2+ regulation not proven","Organelle specificity of vMIA–MFF dependence mechanism unclear","Single-lab studies"]},{"year":2023,"claim":"Identified succinylation at Lys302 as a PTM that stabilizes MFF against Parkin degradation, promoting fission and tumor growth.","evidence":"CPT1A manipulation, MS site mapping, K302 mutagenesis, and MFF stability/tumor assays","pmids":["37291333"],"confidence":"Medium","gaps":["Single-lab PTM mapping","Interplay between K302 succinylation and K251 ubiquitination not resolved","Generality beyond ovarian cancer unknown"]},{"year":2024,"claim":"Connected the AMPK→MFF SUMOylation (K151) axis to MiD content in fission complexes, defined FMRP-driven local MFF translation at fission sites, and revealed tissue-specific splicing tuning AMPK responsiveness.","evidence":"K151R mutagenesis with KO rescue and MiD Co-IP; cryo-ET and real-time translation imaging with FMRP loss-of-function; splice-isoform rescue in Mff-KO MEFs","pmids":["39365854","39548330","39293584"],"confidence":"High","gaps":["How SUMOylation mechanically alters MiD recruitment unresolved","FMRP–MFF mRNA targeting determinants not fully mapped","Functional impact of splice isoforms in vivo limited"]},{"year":2025,"claim":"Added TRIM21 as an additional E3 ligase degrading MFF, linking drug-induced MFF loss to mitochondrial dysfunction and senescence, and extended MFF function to DRP1-independent melanosome fission.","evidence":"TRIM21–MFF Co-IP, ubiquitination assays, and rescue; MFF/DRP1 comparative knockdown with ARP2/3 Co-IP and actin imaging at melanosome constrictions","pmids":["41650744","41832149"],"confidence":"Medium","gaps":["TRIM21 ubiquitination site on MFF not mapped","How MFF couples to ARP2/3-driven actin at melanosomes mechanistically unclear","Single-study findings"]},{"year":null,"claim":"A high-resolution structure of the dynamic MFF oligomer engaging higher-order Drp1 (and its integration with MiD proteins) remains undefined, leaving the physical basis of receptor selectivity, actin synergy, and PTM control unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic structure of the MFF trimer or MFF–Drp1 interface","Unified model integrating ubiquitination/SUMOylation/succinylation/phosphorylation on a single MFF molecule lacking","Direct vs indirect basis of several fission-independent roles unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,4,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,15,20]}],"localization":[{"term_id":"GO:0005777","term_label":"peroxisome","supporting_discovery_ids":[0,3,21]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,13]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,17]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[15,21]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[6,10,19]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7,14]}],"complexes":["DRP1–MiD–MFF fission complex","MARCH5/p97/Npl4 ubiquitin-ligase complex"],"partners":["DNM1L","MIEF1","MIEF2","VDAC1","BCL2L1","MARCH5","PEX11B","FMR1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9GZY8","full_name":"Mitochondrial fission factor","aliases":[],"length_aa":342,"mass_kda":38.5,"function":"Plays a role in mitochondrial and peroxisomal fission (PubMed:18353969, PubMed:23530241, PubMed:24196833). Promotes the recruitment and association of the fission mediator dynamin-related protein 1 (DNM1L) to the mitochondrial surface (PubMed:23530241). 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MIEF2","url":"https://www.omim.org/entry/615498"},{"mim_id":"615497","title":"MITOCHONDRIAL ELONGATION FACTOR 1; MIEF1","url":"https://www.omim.org/entry/615497"},{"mim_id":"614785","title":"MITOCHONDRIAL FISSION FACTOR; MFF","url":"https://www.omim.org/entry/614785"},{"mim_id":"614388","title":"ENCEPHALOPATHY DUE TO DEFECTIVE MITOCHONDRIAL AND PEROXISOMAL FISSION 1; EMPF1","url":"https://www.omim.org/entry/614388"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Neuroinflammation","date":"2024-07-03","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.01.601612","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46859,"output_tokens":8162,"usd":0.131503,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17676,"output_tokens":5613,"usd":0.114352,"stage2_stop_reason":"end_turn"},"total_usd":0.245855,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"MFF is a tail-anchored protein of the mitochondrial outer membrane that controls mitochondrial fission; siRNA knockdown causes a closed mitochondrial network phenotype similar to Drp1/Fis1 knockdown, and MFF and Fis1 exist in separate ~200 kDa complexes, suggesting distinct roles in fission. MFF knockdown also inhibits peroxisomal fission.\",\n      \"method\": \"siRNA screen in Drosophila cells, human cell siRNA knockdown, co-immunoprecipitation/size-exclusion to distinguish MFF and Fis1 complexes, mitochondrial/peroxisomal morphology assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — foundational discovery paper with multiple orthogonal methods (RNAi, morphology, fractionation) and independent replication across species\",\n      \"pmids\": [\"18353969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MFF is an essential mitochondrial outer membrane receptor for Drp1 recruitment: MFF knockdown releases Drp1 foci from the MOM with network extension; overexpression stimulates Drp1 recruitment and fission; MFF and Drp1 physically interact in vitro and in vivo; MFF-dependent fission is independent of Fis1; retargeting MFF to the plasma membrane via a CAAX motif redirects Drp1 to that membrane; MFF knockdown compromises stimulus-induced fission and apoptosis.\",\n      \"method\": \"siRNA knockdown, overexpression, in vitro and in vivo co-immunoprecipitation/pulldown, CAAX membrane-retargeting assay, apoptosis assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods including in vitro binding assay, in vivo Co-IP, genetic retargeting, and functional rescue; independently replicated\",\n      \"pmids\": [\"21149567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Both MFF and Fis1 contribute to Drp1 recruitment and mitochondrial fission; MFF-null and Fis1-null cells each show reduced Drp1 puncta size/number on mitochondria; MiD49 and MiD51 can independently mediate Drp1 recruitment and fission in the absence of both Fis1 and Mff.\",\n      \"method\": \"Gene knockout cell lines (Fis1-null, Mff-null, Fis1/Mff-null), immunofluorescence of Drp1 puncta, mitochondrial morphology analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean null cell lines with defined phenotypic readout; independently consistent with prior work\",\n      \"pmids\": [\"23283981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MFF functions with Pex11pβ and DLP1 (Drp1) in peroxisomal fission: endogenous MFF localizes to peroxisomal membrane-constricted regions; MFF knockdown abolishes the fission stage of peroxisomal division and prevents DLP1 recruitment to peroxisomes; MFF overexpression increases DLP1 peroxisomal targeting and increases Pex11pβ–DLP1 interaction; Pex11pβ interacts with Mff in a DLP1-dependent manner.\",\n      \"method\": \"siRNA knockdown, overexpression, co-immunoprecipitation, immunofluorescence localization\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and localization with functional knockdown, single lab\",\n      \"pmids\": [\"24167709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MFF selectively binds oligomerized (higher-order) Drp1 but not assembly-deficient Drp1 mutants; the insert B region of Drp1 inhibits Mff–Drp1 interaction; recombinant Drp1 lacking insert B forms a stable complex with Mff; in contrast, MiD51/MiD49 can recruit Drp1 dimers, explaining divergent outcomes of overexpression.\",\n      \"method\": \"Genetic and biochemical assays with recombinant proteins, pulldown with assembly-deficient Drp1 mutants, in vitro binding\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"26446846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mff-deficient mice develop lethal dilated cardiomyopathy with reduced mitochondrial density and respiratory chain activity and increased mitophagy; concurrent deletion of the fusion gene Mfn1 completely rescues heart dysfunction, lifespan, and respiratory chain function, demonstrating that rebalancing fission/fusion restores organ physiology.\",\n      \"method\": \"Mouse knockout and double-knockout genetics, cardiac function assessment, electron microscopy, respiratory chain activity assay, mitophagy markers\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo double-knockout epistasis with multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"26598616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The phosphorylation status of Drp1 at Ser637 is essential for its interaction with Mff; UV irradiation reduces cytoplasmic and mitochondrial Drp1 Ser637 phosphorylation and enhances the Drp1–Mff interaction, leading to mitochondrial fragmentation; Mff-mediated Drp1 recruitment does not require Bax.\",\n      \"method\": \"UV irradiation apoptosis model, co-immunoprecipitation of Drp1 and Mff, phospho-Drp1 western blot, Bax-null cell experiments\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with phosphorylation site analysis, single lab\",\n      \"pmids\": [\"26432782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Parkin ubiquitinates Mff at lysine 251 upon mitochondrial depolarization; K251R mutation abolishes Parkin-stimulated ubiquitination; ubiquitinated Mff promotes association with the autophagic adapter p62/SQSTM1; Mff knockout impairs p62 translocation to damaged mitochondria and Parkin translocation, blocking mitophagy clearance.\",\n      \"method\": \"CCCP-induced mitochondrial depolarization, co-immunoprecipitation, site-directed mutagenesis (K251R), Mff knockout rescue experiments, immunofluorescence\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus Co-IP plus KO rescue, single lab\",\n      \"pmids\": [\"26008206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MiD51 suppresses Mff-dependent enhancement of Drp1 GTPase activity; proximity-based biotin labeling (BioID) shows close associations between MiD51, Mff, and Drp1 but not Fis1; combined loss of MiD51 and Mff further enhances mitochondrial connectivity compared to single knockouts.\",\n      \"method\": \"CRISPR/Cas9 gene editing, BioID proximity labeling, Drp1 GTPase activity assay, mitochondrial morphology analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical GTPase assay plus proximity labeling plus clean CRISPR knockouts; multiple orthogonal methods\",\n      \"pmids\": [\"27076521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mff and Drp1 negatively regulate MARCH5 E3 ubiquitin ligase activity toward MiD49 and Mcl1; Mff knockout leads to reduced expression, shorter half-lives, and increased ubiquitination of MiD49 and Mcl1 via MARCH5; Mff is an integral component of the MARCH5/p97/Npl4 complex.\",\n      \"method\": \"Mff and Drp1 knockout cells, MARCH5 knockout double-mutant cells, protein half-life assays, ubiquitination assays, co-immunoprecipitation of MARCH5/p97/Npl4/Mff complex\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and double-KO epistasis, single lab\",\n      \"pmids\": [\"27932492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SENP3-mediated deSUMOylation of Drp1 promotes Drp1 binding to Mff on the mitochondrial outer membrane; preventing Drp1 SUMOylation (SUMO-site mutant) enhances Mff binding; knocking down SENP3 reduces Drp1–Mff interaction and stress-induced cytochrome c release; directly tethering Drp1 to the MOM bypasses the need for Mff and occludes the SENP3 effect.\",\n      \"method\": \"SENP3 overexpression/knockdown, SUMO-site Drp1 mutants, co-immunoprecipitation, cytochrome c release assay, Drp1 MOM-tethering construct\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus Co-IP plus functional tethering bypass, single lab\",\n      \"pmids\": [\"28262828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CK2α phosphorylates MFF downstream of NR4A1 activation during cardiac microvascular IR injury; phosphorylated MFF enhances cytoplasmic Drp1 translocation to mitochondria, causing fatal mitochondrial fission.\",\n      \"method\": \"NR4A1 knockout mice, in vitro endothelial cell model, CK2α inhibitor, western blot for phospho-Mff, immunofluorescence for Drp1 translocation\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout plus kinase inhibitor validation, single lab\",\n      \"pmids\": [\"29744594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MFF overexpression forms homo- and heterodimeric complexes with VDAC1 via key contact residues (Arg225, Arg236, Gln241); a cell-permeable MFF peptidomimetic disrupts the MFF-VDAC1 complex, acutely depolarizes mitochondria, and triggers cell death in tumor but not normal cells.\",\n      \"method\": \"Co-immunoprecipitation, mutational analysis of contact residues, peptidomimetic functional assay, mitochondrial membrane potential assay, in vitro cell death assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutational mapping and functional peptidomimetic, single lab\",\n      \"pmids\": [\"31582380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MFF is required for axonal mitochondrial size maintenance: MFF downregulation in cortical pyramidal neurons increases presynaptic mitochondrial size, augments mitochondrial Ca2+ uptake during neurotransmission, reduces presynaptic Ca2+ accumulation, decreases neurotransmitter release, and reduces terminal axon branching; MFF does not affect mitochondrial trafficking, presynaptic capture, membrane potential, or ATP generation.\",\n      \"method\": \"In vitro and in vivo MFF knockdown in cortical neurons, live imaging of mitochondria and Ca2+, electrophysiology/release assays, axon branching quantification\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro and in vivo loss-of-function with multiple specific functional readouts; defined mechanistic pathway\",\n      \"pmids\": [\"30479337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Parkin ubiquitinates Mff in a PINK1-dependent manner under non-stressed (basal) conditions to regulate constitutive Mff turnover; shRNA-mediated Parkin knockdown does not completely prevent basal Mff ubiquitination, indicating at least one additional ubiquitin ligase contributes to Mff proteostasis.\",\n      \"method\": \"Parkin/PINK1 shRNA knockdown, ubiquitination assays under non-stressed conditions, protein turnover assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA knockdown with ubiquitination assay, single lab\",\n      \"pmids\": [\"31112535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MAVS is activated by Mff through formation of active MAVS clusters on mitochondria, independent of mitochondrial fission and Drp1; under mitochondrial dysfunction, AMPK phosphorylates Mff, leading to disorganization of MAVS clusters and repression of the acute antiviral response; Mff also contributes to immune tolerance during chronic infection by disrupting mitochondrial MAVS clusters.\",\n      \"method\": \"Cell culture overexpression/knockdown, AMPK activation/inhibition, MAVS clustering assays, antiviral signaling readouts, Drp1-independent assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (clustering assay, AMPK manipulation, Drp1 independence test, antiviral functional assay), single lab\",\n      \"pmids\": [\"33177519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pum2 (RNA-binding protein) negatively regulates Mff mRNA translation; in ischemic AKI, Pum2 is downregulated, inversely correlating with Mff upregulation; Pum2 overexpression reduces Mff protein levels and protects against mitochondrial fission-dependent renal injury.\",\n      \"method\": \"Mff genetic deletion mouse model, Pum2 overexpression, western blot for Pum2/Mff correlation, ischemic AKI mouse model\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic deletion plus overexpression with defined phenotypic readout, single lab\",\n      \"pmids\": [\"31993882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mff is an oligomer (most likely trimer) that dynamically associates/disassociates through its C-terminal coiled-coil (Kd ~10 µM); dynamic Mff oligomerization is required for Drp1 activation; actin filaments enhance Mff-mediated Drp1 activation by lowering the effective Mff concentration ~10-fold; Mff interacts with Drp1 on actin filaments in an oligomerization-dependent manner; oligomerization-defective Mff fails to rescue mitochondrial/peroxisome division, Drp1 recruitment, or Mff puncta formation in Mff-KO cells.\",\n      \"method\": \"In vitro reconstitution with purified proteins, TIRF microscopy, Drp1 GTPase activation assay, Mff-KO rescue with oligomerization-defective mutants, U2OS cell division/morphology assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, TIRF imaging, GTPase assay, and cell-based rescue experiments with structure-function mutants\",\n      \"pmids\": [\"34347505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PKD (Protein Kinase D) directly phosphorylates MFF specifically during mitosis; PKD-dependent MFF phosphorylation is required and sufficient for mitochondrial fission in mitotic but not interphase cells; MFF phosphorylation is crucial for chromosome segregation and cell survival by inhibiting adaptation of the mitotic checkpoint.\",\n      \"method\": \"In vitro kinase assay, phospho-MFF site identification, PKD inhibition/overexpression, mitosis-specific cell imaging, chromosome segregation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct kinase assay with functional mitotic phenotype, single lab with multiple methods\",\n      \"pmids\": [\"34010649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mff primes Drp1 binding to Bcl-xL at mitochondria; Mff and Bcl-xL can interact directly, independent of Drp1, through their transmembrane domains; SENP3-mediated deSUMOylation of Drp1 promotes the Drp1–Bcl-xL interaction; recovery of SENP3 after OGD/reoxygenation promotes the Drp1–Bcl-xL interaction and cell death.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, SUMO-site Drp1 mutants, OGD model, Bcl-xL mutant with defective Drp1 binding\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vitro binding plus mutagenesis, single lab\",\n      \"pmids\": [\"34722538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mff preferentially binds higher-order oligomers of Drp1, while MIEFs bind a wider range of Drp1 assembly states including lower oligomers; forced Drp1 recruitment by either Mff or MIEFs facilitates Drp1 oligomerization on mitochondria; MIEFs serve as a platform facilitating Drp1 binding to Mff, and loss of MIEFs severely impairs Drp1–Mff interaction.\",\n      \"method\": \"In vivo chemical crosslinking, co-immunoprecipitation with oligomerization and GTPase-deficient Drp1 mutants, Mff/MIEF1/2-deficient cell lines\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical crosslinking plus Co-IP with mutants, single lab\",\n      \"pmids\": [\"34805137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human HCMV vMIA inhibits MAVS oligomerization at peroxisomes in an MFF-dependent manner; vMIA is totally dependent on MFF (the organelle fission machinery) to induce peroxisomal fragmentation, while this dependency is not observed at mitochondria; vMIA interacts with MAVS at peroxisomes and inhibits its oligomerization.\",\n      \"method\": \"HCMV infection, vMIA expression, MFF knockdown/knockout, MAVS oligomerization assay, peroxisomal and mitochondrial morphology analysis\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function plus MAVS functional assay, single lab\",\n      \"pmids\": [\"35445031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CPT1A promotes succinylation of MFF at lysine 302 (K302) through its lysine succinyltransferase (LSTase) activity; K302 succinylation protects MFF against Parkin-mediated ubiquitin-proteasomal degradation; elevated MFF succinylation promotes mitochondrial fission and ovarian cancer cell growth.\",\n      \"method\": \"CPT1A overexpression/knockdown, mass spectrometry identification of K302 succinylation site, site-directed mutagenesis, MFF protein stability assay with Parkin, in vivo tumor model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — PTM site identification by MS, mutagenesis, and functional rescue, single lab\",\n      \"pmids\": [\"37291333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MFF is SUMOylated at Lys151; MFF SUMOylation is enhanced following AMPK-mediated phosphorylation; MFF SUMOylation regulates the level of MiD (MiD49/51) binding to MFF in the trimeric DRP1-MiD-MFF complex; CCCP-induced mitochondrial fragmentation is impaired in MFF-KO MEFs expressing non-SUMOylatable MFF K151R, demonstrating that AMPK→MFF SUMOylation dynamically controls stress-induced fragmentation by modulating MiD levels in fission complexes.\",\n      \"method\": \"Site-directed mutagenesis (K151R), SUMO assay, AMPK activation, MFF-KO MEF rescue, CCCP treatment, co-immunoprecipitation for MiD–MFF interaction\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis, KO rescue, and Co-IP with multiple orthogonal approaches, single lab\",\n      \"pmids\": [\"39365854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FMRP granules are recruited to the mitochondrial midzone (fission sites) in axons and dendrites; FMRP promotes local translation of MFF at mitochondria-associated ribosome-rich granules, specifically enabling replicative fission at the mitochondrial midzone; disrupting FMRP function dysregulates MFF translation and causes increased peripheral fission and irregular mitochondrial nucleoid distribution.\",\n      \"method\": \"Cryo-electron tomography, real-time translation imaging, FMRP granule live imaging, FMRP loss-of-function, mitochondrial fission site imaging, nucleoid distribution assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-ET plus real-time translation imaging plus loss-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"39548330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Mouse Mff has tissue-specific alternative splicing; insertion of exon 6 just after the AMPK phosphorylation site reduces AMPK-mediated Mff phosphorylation and impairs both mitochondrial fission and MAVS-dependent antiviral response functions; this splicing effect is independent of phosphorylation per se.\",\n      \"method\": \"Splice isoform introduction into Mff-KO MEFs, AMPK phosphorylation assay, mitochondrial fission assay, antiviral signaling assay\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform rescue in KO cells with phosphorylation and functional assays, single lab\",\n      \"pmids\": [\"39293584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MFF is trafficked between mitochondria and melanosomes and localizes at melanosome fission events; MFF downregulation (but not DRP1 knockdown) causes melanosome enlargement, intracellular melanin accumulation, and increased lumenal catabolism; MFF interacts with regulators of the ARP2/3 complex; actin filaments accumulate between melanosomes at MFF-enriched constriction sites; ARP2/3 subunit silencing mimics MFF loss, indicating MFF mediates actin-dependent melanosome fission independently of DRP1.\",\n      \"method\": \"MFF downregulation, DRP1 knockdown comparison, live imaging of MFF trafficking, immunofluorescence at fission sites, ARP2/3 co-immunoprecipitation, ARP2/3 knockdown phenocopy\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple KD experiments with defined phenotypes and Co-IP for ARP2/3 interaction, single study\",\n      \"pmids\": [\"41832149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MFF-insufficiency (siRNA) in dopaminergic neurons causes impaired neurite outgrowth, mitochondrial Ca2+ accumulation via accelerated Ca2+ influx from the ER through the InsP3R, excessive mitochondrial ROS production, and downregulation of PGC-1α; MFF co-immunoprecipitates with VDAC1, an essential component of the ER-mitochondrial Ca2+ transport system, suggesting MFF negatively regulates mitochondrial Ca2+ influx from the ER.\",\n      \"method\": \"MFF siRNA in stem cell-derived dopaminergic neurons, Ca2+ imaging, ROS measurement, co-immunoprecipitation of MFF and VDAC1, neurite outgrowth assay\",\n      \"journal\": \"Antioxidants\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional RNAi with multiple readouts, single lab\",\n      \"pmids\": [\"35883852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bcl-xL interacts with Mff to form heterogeneous oligomers with 1:2 stoichiometry in cytoplasm and 1:1 stoichiometry on mitochondria; Bcl-xL coexpression reconstructs the Mff network from punctate higher-order oligomers to filamentous lower-order oligomers; Bcl-xL inhibits Mff-mediated mitochondrial fragmentation and apoptosis.\",\n      \"method\": \"Live-cell FRET two-hybrid assay, fluorescence microscopy, oligomer distribution analysis\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET-based interaction assay with stoichiometry analysis, single lab\",\n      \"pmids\": [\"31587505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mcl-1 inhibits Mff-mediated mitochondrial fragmentation and apoptosis; however, Mcl-1 does NOT directly bind to Mff on mitochondria (negative finding confirmed by FRET analysis in live cells).\",\n      \"method\": \"Live-cell co-expression, FRET efficiency measurement, mitochondrial morphology and apoptosis assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET and functional assay; negative result for direct binding is itself mechanistically informative, single lab\",\n      \"pmids\": [\"31941601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM21 E3 ubiquitin ligase mediates ubiquitination and proteasomal degradation of MFF; ciprofloxacin exposure upregulates TRIM21, promotes TRIM21-mediated MFF degradation, and the resulting reduction in MFF causes mitochondrial dysfunction and cell senescence in trophoblasts.\",\n      \"method\": \"Co-immunoprecipitation of TRIM21-MFF, ubiquitination assay, TRIM21 overexpression/knockdown, MFF rescue experiments\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, and functional rescue, single lab\",\n      \"pmids\": [\"41650744\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MFF is a tail-anchored mitochondrial (and peroxisomal) outer membrane protein that functions as the principal receptor for cytosolic Drp1, selectively recruiting higher-order Drp1 oligomers via a dynamic trimeric Mff scaffold whose assembly depends on its C-terminal coiled-coil; Mff-mediated Drp1 activation is synergistically enhanced by actin filaments, is regulated by AMPK-dependent phosphorylation (promoting fission), PKD-dependent phosphorylation (mitosis-specific fission), Parkin-dependent ubiquitination (constitutive turnover and mitophagy), SENP3-mediated deSUMOylation of Drp1 (enhancing Mff–Drp1 binding), SUMO modification of Mff itself at K151 (controlling MiD levels in the trimeric DRP1–MiD–MFF complex), and lysine succinylation at K302 (protecting against Parkin-mediated degradation); beyond canonical fission, Mff also nucleates active MAVS signaling clusters on mitochondria for antiviral immunity, participates in a MARCH5/p97/Npl4 ubiquitin-ligase complex to control MiD49 and Mcl1 stability, mediates actin/ARP2/3-dependent melanosome fission independently of Drp1, and locally translated MFF in neurons is regulated by FMRP to control compartment-specific mitochondrial size and presynaptic calcium/neurotransmitter release.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MFF is a tail-anchored protein of the mitochondrial and peroxisomal outer membrane that serves as the principal receptor for the cytosolic GTPase Drp1, driving organelle fission [#0, #1, #3]. It functions as a dynamic oligomer—most likely a trimer—whose self-association through a C-terminal coiled-coil is required to activate Drp1, with actin filaments enhancing this activation by concentrating the machinery [#17]. MFF selectively engages higher-order, assembly-competent Drp1 oligomers rather than dimers, a selectivity that distinguishes it from the MiD49/MiD51 receptors with which it co-assembles into a trimeric DRP1–MiD–MFF fission complex [#4, #20, #23]. Drp1 recruitment to MFF is gated by Drp1 modification state: Ser637 dephosphorylation and SENP3-mediated deSUMOylation of Drp1 both promote the MFF–Drp1 interaction and downstream cytochrome c release and apoptosis [#6, #10]. MFF activity is itself tuned by a layered post-translational code—AMPK phosphorylation and the consequent SUMOylation at Lys151 controlling MiD levels in the fission complex during stress [#23], PKD phosphorylation driving mitosis-specific fission needed for chromosome segregation [#18], Parkin/PINK1 ubiquitination governing both constitutive turnover and mitophagic clearance of damaged mitochondria [#7, #14], and CPT1A-dependent succinylation at Lys302 protecting MFF from Parkin-mediated degradation [#22]. Physiologically, balanced MFF-driven fission is essential: its loss in mice causes lethal dilated cardiomyopathy rescued by concurrent ablation of the fusion gene Mfn1 [#5], and in neurons FMRP-controlled local translation of MFF sets compartment-specific mitochondrial size and presynaptic calcium handling and neurotransmitter release [#13, #24]. Beyond canonical fission, MFF nucleates active MAVS clusters on mitochondria for antiviral signaling independently of Drp1 [#15], participates in a MARCH5/p97/Npl4 ubiquitin-ligase complex controlling MiD49 and Mcl1 stability [#9], and mediates actin/ARP2/3-dependent melanosome fission independently of DRP1 [#26].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established MFF as a distinct, dedicated component of the mitochondrial fission machinery, separating it from the previously known Fis1/Drp1 pathway.\",\n      \"evidence\": \"RNAi in Drosophila and human cells with morphology and size-exclusion fractionation showing MFF and Fis1 in separate complexes\",\n      \"pmids\": [\"18353969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how MFF promotes fission molecularly\", \"Relationship to Drp1 recruitment unresolved\", \"Peroxisomal role noted but not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified MFF as an essential outer-membrane receptor that physically recruits Drp1 to mitochondria, defining the receptor logic of fission.\",\n      \"evidence\": \"siRNA/overexpression, in vitro and in vivo Co-IP, and CAAX membrane-retargeting redirecting Drp1 to the plasma membrane\",\n      \"pmids\": [\"21149567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain selectivity for Drp1 assembly states\", \"Stoichiometry/oligomeric state of MFF unknown\", \"Did not resolve overlap with Fis1 and MiD receptors\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved the redundancy among Drp1 receptors, showing MFF, Fis1, and the MiD proteins each contribute to Drp1 recruitment, and extended MFF function to peroxisomal division.\",\n      \"evidence\": \"Single and combinatorial knockout cell lines with Drp1 puncta quantification; reciprocal Co-IP and localization at peroxisomal constrictions\",\n      \"pmids\": [\"23283981\", \"24167709\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative hierarchy among receptors not established\", \"Peroxisomal Pex11pβ–MFF Co-IP from single lab\", \"Mechanism of constriction-site targeting unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the molecular basis of MFF–Drp1 selectivity and demonstrated physiological necessity of MFF-driven fission in vivo.\",\n      \"evidence\": \"In vitro binding with assembly-deficient Drp1 and insert-B mutants; mouse Mff/Mfn1 double-knockout cardiac epistasis; UV-apoptosis Co-IP linking Drp1 Ser637 dephosphorylation to binding\",\n      \"pmids\": [\"26446846\", \"26598616\", \"26432782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the higher-order-oligomer interface not solved\", \"How fission/fusion imbalance kills cardiomyocytes mechanistically unclear\", \"Upstream kinase/phosphatase controlling Ser637 in this context not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked MFF to the Parkin/PINK1 mitophagy axis, showing MFF ubiquitination couples fission machinery to autophagic clearance.\",\n      \"evidence\": \"CCCP depolarization, K251R mutagenesis, p62 translocation assays, and Mff knockout rescue\",\n      \"pmids\": [\"26008206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP/mutagenesis\", \"Whether ubiquitination acts via turnover or adaptor recruitment not fully separated\", \"Other contributing ligases not identified at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed MFF within a regulatory network with MiD51 and the MARCH5 ubiquitin-ligase complex, showing MFF both is regulated by and regulates fission-complex protein stability.\",\n      \"evidence\": \"CRISPR knockouts, BioID proximity labeling, Drp1 GTPase assays, protein half-life/ubiquitination measurements, and MARCH5/p97/Npl4 Co-IP\",\n      \"pmids\": [\"27076521\", \"27932492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MARCH5 complex stoichiometry and direct contacts undefined\", \"How MFF restrains MARCH5 activity mechanistically unclear\", \"Single-lab epistasis for stability control\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed that Drp1 SUMO state, controlled by SENP3, gates the MFF–Drp1 interaction and stress-induced apoptosis.\",\n      \"evidence\": \"SENP3 manipulation, Drp1 SUMO-site mutants, Co-IP, cytochrome c release, and MOM-tethering bypass\",\n      \"pmids\": [\"28262828\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP evidence\", \"Direct contribution of SUMO to binding interface not structurally resolved\", \"Physiological trigger of SENP3 activation here not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded MFF regulation and function to phospho-control of pathological fission, neuronal mitochondrial sizing, and a Drp1-independent VDAC1 interaction exploitable in cancer.\",\n      \"evidence\": \"CK2α/NR4A1 cardiac IR model; neuronal MFF knockdown with Ca2+ imaging and release electrophysiology; VDAC1 Co-IP with peptidomimetic disruption\",\n      \"pmids\": [\"29744594\", \"30479337\", \"31582380\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"VDAC1 interaction and its physiological role only partly mapped\", \"Neuronal phenotype mechanism downstream of size not fully traced\", \"CK2α phospho-site on MFF not pinned to structure\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established that Parkin ubiquitinates MFF under basal conditions for constitutive turnover, while implicating Bcl-xL as a direct MFF partner restraining fission.\",\n      \"evidence\": \"Parkin/PINK1 shRNA with basal ubiquitination/turnover assays; FRET two-hybrid showing Bcl-xL–MFF oligomer stoichiometry and network remodeling\",\n      \"pmids\": [\"31112535\", \"31587505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Additional basal MFF ligase(s) not identified\", \"Bcl-xL–MFF interface and its in vivo relevance undefined\", \"Single-lab FRET stoichiometry\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Uncovered a fission-independent role for MFF as a platform that nucleates antiviral MAVS clusters, gated by AMPK phosphorylation, plus translational and apoptotic regulators of MFF.\",\n      \"evidence\": \"MAVS clustering assays with Drp1-independence tests and AMPK manipulation; Pum2 translational repression in ischemic AKI; Mcl-1 FRET showing functional inhibition without direct binding\",\n      \"pmids\": [\"33177519\", \"31993882\", \"31941601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AMPK phosphorylation reorganizes MAVS clusters structurally unknown\", \"Mcl-1 acts on MFF function indirectly by an undefined route\", \"Pum2–MFF mRNA regulation mechanism not detailed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined MFF's dynamic oligomeric mechanism and its actin synergy, and added PKD-driven mitotic phosphorylation and Bcl-xL/SENP3 apoptotic coupling.\",\n      \"evidence\": \"In vitro reconstitution with TIRF and GTPase assays and oligomerization-defective rescue; in vitro PKD kinase assays with mitotic phenotyping; Co-IP/in vitro binding for MFF–Bcl-xL priming of Drp1; crosslinking analysis of Drp1 assembly-state binding by MFF versus MIEFs\",\n      \"pmids\": [\"34347505\", \"34010649\", \"34722538\", \"34805137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the trimeric scaffold lacking\", \"How actin physically lowers effective MFF concentration unresolved\", \"PKD phospho-site structural consequence not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked MFF to ER–mitochondrial Ca2+ handling in dopaminergic neurons and to peroxisomal MAVS control hijacked by viral immune evasion.\",\n      \"evidence\": \"MFF siRNA in dopaminergic neurons with Ca2+/ROS imaging and VDAC1 Co-IP; HCMV vMIA with MFF-dependent peroxisomal MAVS oligomerization assays\",\n      \"pmids\": [\"35883852\", \"35445031\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether VDAC1 binding directly mediates Ca2+ regulation not proven\", \"Organelle specificity of vMIA–MFF dependence mechanism unclear\", \"Single-lab studies\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified succinylation at Lys302 as a PTM that stabilizes MFF against Parkin degradation, promoting fission and tumor growth.\",\n      \"evidence\": \"CPT1A manipulation, MS site mapping, K302 mutagenesis, and MFF stability/tumor assays\",\n      \"pmids\": [\"37291333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab PTM mapping\", \"Interplay between K302 succinylation and K251 ubiquitination not resolved\", \"Generality beyond ovarian cancer unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected the AMPK→MFF SUMOylation (K151) axis to MiD content in fission complexes, defined FMRP-driven local MFF translation at fission sites, and revealed tissue-specific splicing tuning AMPK responsiveness.\",\n      \"evidence\": \"K151R mutagenesis with KO rescue and MiD Co-IP; cryo-ET and real-time translation imaging with FMRP loss-of-function; splice-isoform rescue in Mff-KO MEFs\",\n      \"pmids\": [\"39365854\", \"39548330\", \"39293584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SUMOylation mechanically alters MiD recruitment unresolved\", \"FMRP–MFF mRNA targeting determinants not fully mapped\", \"Functional impact of splice isoforms in vivo limited\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Added TRIM21 as an additional E3 ligase degrading MFF, linking drug-induced MFF loss to mitochondrial dysfunction and senescence, and extended MFF function to DRP1-independent melanosome fission.\",\n      \"evidence\": \"TRIM21–MFF Co-IP, ubiquitination assays, and rescue; MFF/DRP1 comparative knockdown with ARP2/3 Co-IP and actin imaging at melanosome constrictions\",\n      \"pmids\": [\"41650744\", \"41832149\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TRIM21 ubiquitination site on MFF not mapped\", \"How MFF couples to ARP2/3-driven actin at melanosomes mechanistically unclear\", \"Single-study findings\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of the dynamic MFF oligomer engaging higher-order Drp1 (and its integration with MiD proteins) remains undefined, leaving the physical basis of receptor selectivity, actin synergy, and PTM control unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic structure of the MFF trimer or MFF–Drp1 interface\", \"Unified model integrating ubiquitination/SUMOylation/succinylation/phosphorylation on a single MFF molecule lacking\", \"Direct vs indirect basis of several fission-independent roles unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 4, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 15, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [0, 3, 21]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [15, 21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [6, 10, 19]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 14]}\n    ],\n    \"complexes\": [\"DRP1–MiD–MFF fission complex\", \"MARCH5/p97/Npl4 ubiquitin-ligase complex\"],\n    \"partners\": [\"DNM1L\", \"MIEF1\", \"MIEF2\", \"VDAC1\", \"BCL2L1\", \"MARCH5\", \"PEX11B\", \"FMR1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}