| 2011 |
MIEF1 (MiD51) is anchored to the outer mitochondrial membrane and directly recruits Drp1 to the mitochondrial surface; knockdown of MIEF1 reduces Drp1 association with mitochondria, leading to unopposed fusion and mitochondrial elongation. |
Immunofluorescence, co-immunoprecipitation, knockdown/overexpression in mammalian cells |
The EMBO journal |
High |
21508961 21701560
|
| 2011 |
MIEF1 recruits Drp1 independently of hFis1, Mff, and Mfn2, but inhibits Drp1 fission activity, thereby promoting mitochondrial fusion rather than fission when overexpressed. MIEF1 also interacts with hFis1, and elevated hFis1 partially reverses MIEF1-induced fusion. |
Co-immunoprecipitation, overexpression and knockdown with mitochondrial morphology readout, interaction mapping with Mff/hFis1/Mfn2 |
The EMBO journal |
High |
21701560
|
| 2013 |
MiD51 can mediate Drp1 recruitment and mitochondrial fission in the absence of both Fis1 and Mff, demonstrating it acts as an independent Drp1 receptor. Fis1 and Mff regulate the number and size of Drp1 puncta on mitochondria. |
Fis1-null, Mff-null, and Fis1/Mff double-null cell lines; immunofluorescence analysis of Drp1 puncta |
Molecular biology of the cell |
High |
23283981
|
| 2013 |
MiD51 overexpression sequesters Drp1 specifically at mitochondria acting as a dominant negative, causing unopposed fusion and peroxisomal elongation. At low-level overexpression forming discrete foci, mitochondrial fission still occurs. Unlike Fis1 and Mff, MiD51 is not targeted to peroxisomes. When MiD51 is artificially targeted to peroxisomes or lysosomes, Drp1 is specifically recruited to those organelles. |
Overexpression at varying levels, targeting constructs to peroxisomes/lysosomes, immunofluorescence, mitofusin 1/2 double-knockout cells |
The Journal of biological chemistry |
High |
23921378
|
| 2014 |
Crystal structure of the cytosolic domain of human MiD51 reveals a nucleotidyltransferase fold. MiD51 binds GDP and ADP with high specificity but lacks catalytic transferase residues. Nucleotide-binding mutants still recruit Drp1, but a separate region outside the nucleotidyltransferase fold is required for Drp1 recruitment and foci formation. MiD51 foci depend on Drp1 presence and distribute to daughter organelles after scission. |
X-ray crystallography, site-directed mutagenesis, pull-down assays, live-cell imaging |
The Journal of cell biology |
High |
24515348
|
| 2014 |
MiD51 contains a nucleotidyltransferase domain that binds ADP with high affinity. MiD51 recruits Drp1 via a surface loop independently of ADP binding. However, without ADP, recruited Drp1 cannot be activated for fission: purified MiD51 strongly inhibits Drp1 assembly and GTP hydrolysis in vitro, and ADP addition relieves this inhibition and promotes Drp1 assembly into spirals with enhanced GTPase activity. ADP is thus an essential cofactor for MiD51-mediated fission. |
X-ray crystallography, in vitro GTPase assays, Drp1 sedimentation/assembly assays, mutagenesis |
Structure |
High |
24508339
|
| 2016 |
MiD51 can suppress Mff-dependent enhancement of Drp1 GTPase activity. Proximity-based biotinylation shows close associations between MiD51, Mff, and Drp1, but not Fis1. Loss of MiD51 and Mff together confers greater mitochondrial connectivity and increased resistance to intrinsic apoptosis than loss of either alone. |
CRISPR/gene editing knockouts, BioID proximity labeling, Drp1 GTPase activity assay, apoptosis assays |
Journal of cell science |
High |
27076521
|
| 2015 |
During UV irradiation-induced apoptosis, the interaction between Fis1 and MiD51/MIEF1 increases while the interaction between Drp1 and MiD51/MIEF1 decreases, suggesting that Fis1 competitively binds MiD51 to release and activate Drp1 indirectly. |
Co-immunoprecipitation before/after UV irradiation, western blotting, immunofluorescence |
FASEB journal |
Medium |
26432782
|
| 2018 |
MIEF1-MP (MIEF1 microprotein), encoded by a small ORF in the 5'UTR of the MIEF1 transcript, localizes to the mitochondrial matrix and interacts with the mitoribosome. Loss of MIEF1-MP decreases mitochondrial translation rate; elevated MIEF1-MP increases it. |
APEX2 proximity labeling, ribosome interaction assays, gain/loss-of-function with mitochondrial translation readout |
Biochemistry |
Medium |
30215512
|
| 2019 |
Loss of MIEF1 triggers translocation of BAX to mitochondria, decreases mitochondrial membrane potential, and promotes release of DIABLO/SMAC and cytochrome c, sensitizing cells to apoptosis. MIEF1 degradation during staurosporine treatment occurs via the ubiquitin-proteasome system. |
MIEF1 knockout cells, flow cytometry, western blotting, live-cell imaging, proteasome inhibitor experiments |
Autophagy |
Medium |
30894073
|
| 2019 |
MIEF1 deficiency impairs mitochondrial respiration and induces oxidative stress, sensitizing cells to PINK1-PRKN-mediated mitophagy. Upon MIEF1 loss, PRKN recruitment to depolarized mitochondria leads to UPS-dependent degradation of MFN2 and FIS1. |
MIEF1 knockout, PINK1/PRKN pathway analysis, oxygen consumption rate measurements, western blotting |
Autophagy |
Medium |
30894073
|
| 2019 |
Two distinct regions on MiD51 directly bind Drp1; the interaction is regulated by GTP binding to Drp1 and depends on Drp1 polymerization. Dimerization of MiD51 via residue C452 is required for proper regulation of mitochondrial dynamics. |
Pull-down assays, mutagenesis of MiD51 (C452), Drp1 GTP-binding mutants, mitochondrial morphology assays |
PloS one |
Medium |
30703167
|
| 2021 |
In intact mammalian cells, Drp1 exists as a mixture of oligomeric assembly states. MIEFs (MIEF1 and MIEF2) bind a wider range of Drp1 assembly states including lower and higher oligomers and recruit both active and inactive Drp1, whereas Mff preferentially binds higher-order Drp1 oligomers and only active forms. MIEFs serve as a platform facilitating Drp1 binding to Mff; loss of MIEFs severely impairs Drp1–Mff interaction. Forced recruitment of Drp1 by MIEFs facilitates Drp1 oligomerization. |
In vivo chemical crosslinking, Mff/MIEF1/2-deficient cells, Drp1 oligomerization mutants, co-immunoprecipitation |
Frontiers in cell and developmental biology |
Medium |
34805137
|
| 2024 |
Long-chain acyl-CoA (LCACA) activates MiD51 by inducing its oligomerization, which stimulates Drp1 GTPase activity. LCACA binds in the previously identified nucleotide-binding pocket of MiD51 (1:1 stoichiometry); a point mutation in this pocket reduces LCACA binding and LCACA-induced oligomerization. In cells, the LCACA-binding mutant fails to form puncta or rescue MiD49/51 knockdown effects on mitochondrial length and Drp1 recruitment. MiD51 oligomers synergize with Mff but not actin filaments in Drp1 activation. |
In vitro Drp1 GTPase assay, biochemical binding assays, site-directed mutagenesis, cell-based rescue experiments, oleic acid treatment |
Nature cell biology |
High |
38594588
|
| 2024 |
Actomyosin tension promotes phosphorylation of MIEF1, limiting Drp1 recruitment at mitochondria and inhibiting peri-mitochondrial F-actin formation and mitochondrial fission. DRP1- and MIEF1/2-dependent fission is required and sufficient to regulate YAP/TAZ, SREBP1/2, and NRF2 transcription factors in response to mechanical cues, thereby controlling cell proliferation, lipogenesis, antioxidant metabolism, and adipocyte differentiation. |
ECM stiffness manipulation, applied mechanical forces including mouse skin stretching, phosphorylation assays, DRP1/MIEF1/2 loss-of-function, transcription factor activity readouts |
Nature cell biology |
High |
39433949
|
| 2023 |
Fis1 and MiD51 engage in a direct protein-protein interaction; peptide inhibitors (CVP-241, CVP-242) disrupt this interaction in vitro with measured binding affinities (Fis1/MiD51 KD 0.054 µM). Disrupting Fis1/MiD51 PPI increases cardiomyocyte viability under hypoxic stress. |
In vitro binding assays (fluorescence), molecular docking, cell viability assays in H9c2 cardiomyocytes |
Frontiers in pharmacology |
Medium |
38192411
|
| 2026 |
MAOA interacts directly with MIEF1 (confirmed by co-immunoprecipitation and molecular docking) and enhances MIEF1-DRP1 coupling. Cortisol increases MIEF1 and p-DRP1(Ser616), driving mitochondrial fission; knockdown of MAOA or MIEF1 reduces oxidative stress and mitochondrial fragmentation in trabecular meshwork cells. |
Co-immunoprecipitation, molecular docking, molecular dynamics simulations, MAOA/MIEF1 knockdown and overexpression, confocal microscopy |
Free radical biology & medicine |
Medium |
41579974
|
| 2021 |
Dominant heterozygous mutations in MIEF1 do not disrupt MiD51 localization to the outer mitochondrial membrane or its oligomerization, but significantly disrupt mitochondrial network dynamics, causing optic neuropathy in humans. |
Targeted sequencing, high-resolution confocal live imaging, mitochondrial morphology analysis in patient-derived cells |
Molecular neurodegeneration |
Medium |
33632269
|
| 2018 |
MiD51 silencing (but not silencing of Fis1 or Mff) causes G1-phase cell cycle arrest through ERK1/2- and CDK4-dependent mechanisms in pulmonary artery smooth muscle cells. MiD upregulation in PAH results from decreased miR-34a-3p expression (epigenetic mechanism). |
siRNA knockdown, flow cytometry cell cycle analysis, ERK1/2 and CDK4 pathway analysis, microRNA profiling |
Circulation |
Medium |
29431643
|
| 2025 |
The chromatin remodeler HELLS directly regulates MIEF1 transcription; HELLS knockdown suppresses MIEF1 expression leading to mitochondrial hyperfusion and energy deprivation. The HELLS-MIEF1 axis controls mitochondrial dynamics and genome stability in liver cancer. |
Loss/gain-of-function experiments (HELLS KD and MIEF1 KD/OE), mitochondrial morphology imaging, ChIP or transcriptional target identification |
Cell death & disease |
Medium |
40175344
|