| 2003 |
mitoNEET (CISD1) was identified as a novel mitochondrial binding target of pioglitazone by photoaffinity cross-linking; it is a <17-kDa protein located in the mitochondrial fraction and was found to associate with a complex of solubilized mitochondrial proteins including the trifunctional beta-oxidation protein. |
Photoaffinity cross-linking with tritiated pioglitazone, mass spectrometry, NH2-terminal sequencing, Western blot, size exclusion chromatography, solid-phase pulldown |
American journal of physiology. Endocrinology and metabolism |
High |
14570702
|
| 2007 |
mitoNEET is an integral outer mitochondrial membrane protein with an N-terminal transmembrane anchor and a cytoplasm-facing CDGSH domain containing 1.6 mol Fe per mole protein; cardiac mitochondria from mitoNEET-null mice show reduced oxidative capacity, establishing its role in controlling maximal mitochondrial respiratory rates. |
Bioinformatic analysis, iron quantification, subcellular fractionation/localization, mitoNEET-null mouse model with mitochondrial respiration assays |
Proceedings of the National Academy of Sciences of the United States of America |
High |
17376863
|
| 2007 |
X-ray crystal structure (1.5 Å) of mitoNEET revealed a unique dimeric 'NEET fold' in which each protomer coordinates a 2Fe-2S cluster; pioglitazone binding stabilizes the protein against 2Fe-2S cluster release. |
X-ray crystallography at 1.5 Å, ligand-stability assays with pioglitazone |
Proceedings of the National Academy of Sciences of the United States of America |
High |
17766440
|
| 2007 |
The 2Fe-2S cluster of mitoNEET is redox-active and pH-labile; mass spectrometry confirmed loss of 2Fe and 2S upon cofactor extrusion; spectroscopy showed the cluster is coordinated by Cys-3 and His-1 residues, with protonation of the His ligand triggering cluster release, suggesting a role in Fe-S cluster shuttling and/or redox reactions. |
Optical spectroscopy, electron paramagnetic resonance (EPR), mass spectrometry, recombinant mutagenesis |
The Journal of biological chemistry |
High |
17584744
|
| 2007 |
Crystal structure of human mitoNEET soluble domain (residues 32–108) at 1.8 Å revealed an intertwined homodimer with a [2Fe-2S] cluster coordinated by three cysteines and one histidine (novel CCCH-type motif), and UV-visible spectra indicated redox (oxidized/reduced) states. |
X-ray crystallography at 1.8 Å, UV-visible absorption spectroscopy |
Proceedings of the National Academy of Sciences of the United States of America |
High |
17766439
|
| 2007 |
Crystal structure of the cytoplasmic mitoNEET domain at high resolution confirmed [2Fe-2S] cluster coordination by Cys-72, Cys-74, Cys-83, and His-87; homodimerization is mediated by hydrophobic interactions and hydrogen bonds; His-87 is solvent-exposed and proposed to mediate interaction with other proteins. |
X-ray crystallography, analytical ultracentrifugation (homodimer in solution and crystal) |
The Journal of biological chemistry |
High |
17905743
|
| 2007 |
CISD1 (mitoNEET) mRNA is down-regulated in cystic fibrosis cells and restored upon ectopic CFTR expression; a CISD1-GFP chimera localizes to mitochondria, demonstrating CFTR-dependent regulation of this mitochondrial protein. |
RT-PCR in cell lines with/without CFTR, CFTR inhibitors (glibenclamide, CFTR(inh)-172), cAMP stimulation, live-cell fluorescence imaging of CISD1-GFP |
Biochemical and biophysical research communications |
Medium |
18047834
|
| 2009 |
Thiazolidinedione drug binding shifts the midpoint potential of the mitoNEET [2Fe-2S] cluster by more than 100 mV (from ~0 to −100 mV at pH 7); His87Cys mutation abolishes TZD's ability to affect the redox potential, indicating His87 mediates communication between the drug binding site and the Fe-S center. |
Protein film voltammetry (PFV), site-directed mutagenesis (H87C) |
Biochemistry |
High |
19791753
|
| 2009 |
Resonance Raman spectra of mitoNEET show pH-dependent changes in the Fe-His87 region (250–300 cm⁻¹) absent in the H87C mutant, demonstrating that the Fe-N(His87) interaction is modulated within physiological pH range and that this modulation is coupled to cluster lability. |
Resonance Raman spectroscopy, comparison with H87C mutant |
Biochemistry |
Medium |
19388667
|
| 2010 |
NADPH binds to homodimeric mitoNEET (at residues K55 and H58) and destabilizes the [2Fe-2S] clusters, promoting their release at pH ≤ 7.0 by disrupting inter-subunit interactions with H87′ and R73′. |
NMR spectroscopy, isothermal titration calorimetry, UV-visible absorption, circular dichroism |
Biochemistry |
High |
20932062
|
| 2010 |
EPR analysis of reduced mitoNEET confirmed valence-localized [2Fe-2S] cluster with Fe²⁺ at the His-bound iron; inter-cluster dipolar coupling is detectable and the histidine N-delta coordinates to iron with A_iso = −6.25 MHz. |
Multifrequency/multitechnique EPR (CW, ESEEM, ENDOR, HYSCORE), ¹⁵N-labeling |
Journal of the American Chemical Society |
High |
20099820
|
| 2011 |
mitoNEET transfers its [2Fe-2S] cluster to apo-ferredoxin in a unidirectional, second-order reaction; His87 is required for cluster transfer (H87C mutant inhibits transfer), while the Lys55Glu mutation does not; pioglitazone inhibits iron transfer from mitoNEET to mitochondria in HEK293 cells. |
UV-VIS spectroscopy, native-PAGE, mitochondrial iron detection assay in cells, site-directed mutagenesis (H87C, K55E) |
Proceedings of the National Academy of Sciences of the United States of America |
High |
21788481
|
| 2011 |
Crystal structure of H87C mitoNEET at 1.7 Å showed that replacing His87 with Cys stabilizes the cluster ~6-fold and decreases the redox potential ~300 mV; Cys87 displays two conformations; structural changes are localized to the cluster-binding region. |
X-ray crystallography at 1.7 Å, spectroscopic cluster stability assays |
Acta crystallographica. Section D, Biological crystallography |
High |
21636891
|
| 2012 |
NADPH inhibits [2Fe-2S] cluster transfer from mitoNEET to an apo-acceptor protein (K_i = 200 µM); the conserved Asp-84 residue in the CDGSH domain is required for NADPH-dependent inhibition of cluster transfer. |
In vitro cluster transfer assay, site-directed mutagenesis (D84 variants), inhibition kinetics |
The Journal of biological chemistry |
High |
22351774
|
| 2012 |
mitoNEET overexpression in adipocytes inhibits mitochondrial iron transport into the matrix, reducing electron transport chain activity, lowering β-oxidation rates, mitochondrial membrane potential, and ROS production; mitoNEET knockdown enhances mitochondrial respiratory capacity through increased matrix iron. |
Transgenic mouse overexpression, shRNA knockdown, mitochondrial iron measurements, metabolic/respiration assays |
Nature medicine |
High |
22961109
|
| 2013 |
mitoNEET forms a covalent disulfide bond with glutamate dehydrogenase 1 (GDH1) and acts as an activator of GDH1; specific cysteine residues participating in the disulfide bond were identified by proteomics. |
Protein pulldown, SDS-PAGE, mass spectrometry/proteomics identification of disulfide bond |
Biochemistry |
Medium |
24295216
|
| 2013 |
shRNA suppression of mitoNEET in breast cancer cells causes reduced cell proliferation, decreased mitochondrial performance, uncontrolled accumulation of mitochondrial iron and ROS, and activation of autophagy. |
shRNA knockdown, cell proliferation assays, mitochondrial iron/ROS imaging, autophagy assays, xenograft tumor model |
Proceedings of the National Academy of Sciences of the United States of America |
High |
23959881
|
| 2013 |
TNFα-induced necroptosis in hepatocytes requires mitoNEET: fructose/ethanol overexpression of CISD1 primes cells for TNFα cytotoxicity; TNFα promotes translocation of a Stat3-Grim-19 complex to mitochondria, which binds mitoNEET and triggers rapid release of its 2Fe-2S cluster, causing mitochondrial iron accumulation, ROS surge, and cell death. |
Co-immunoprecipitation (Stat3-Grim-19 with mitoNEET), Western blot, mitochondrial iron measurement, L929 cell and hepatocyte necroptosis models |
Journal of cell science |
Medium |
24357718
|
| 2014 |
mitoNEET Fe-S assembly strictly depends on mitochondrial ISC machinery (not CIA or CIAPIN1); augmenter of liver regeneration (ALR), a Mia40-dependent protein, is specifically required for mitoNEET maturation; holo-mitoNEET can repair oxidatively damaged Fe-S of IRP1/cytosolic aconitase, identifying IRP1 as a physiological acceptor of the mitoNEET Fe-S cluster. |
Genetic epistasis (siRNA depletion of ISC/CIA components), in vitro Fe-S assembly assay, cluster transfer to IRP1 after nitrosative stress, in vivo aconitase activity assay |
The Journal of biological chemistry |
High |
25012650
|
| 2014 |
The [2Fe-2S] clusters of mitoNEET are reduced by glutathione/cysteine/DTT and can be reversibly oxidized by H₂O₂ without cluster disruption; human glutathione reductase efficiently reduces mitoNEET clusters via its redox-active disulfide, whereas rat thioredoxin reductase (selenocysteine-containing) has no such activity. |
In vitro biochemical reduction/oxidation assays, inhibitor (N-ethylmaleimide) studies, UV-visible spectroscopy |
The Journal of biological chemistry |
High |
24403080
|
| 2015 |
Reduction of mitoNEET [2Fe-2S] clusters by human glutathione reductase proceeds via the enzyme's redox-active disulfide in an NADPH-dependent manner; N-ethylmaleimide abolishes this activity; rat thioredoxin reductase (selenocysteine) has negligible activity. |
In vitro enzyme assays, inhibitor studies, comparative enzyme analysis |
Free radical biology & medicine |
Medium |
25645953
|
| 2015 |
MAD-28 (a cluvenone derivative) binds mitoNEET and breaks the coordinative bond between His87 and the cluster Fe, destabilizing the 2Fe-2S cluster; cancer cells with suppressed mitoNEET are less susceptible to MAD-28, confirming NEET proteins as direct drug targets. |
Docking analysis, cell-based functional assays, shRNA suppression epistasis, mitochondrial respiration and iron measurements |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
25762074
|
| 2016 |
CISD1 (mitoNEET) negatively regulates ferroptosis in hepatocellular carcinoma cells by protecting against intramitochondrial lipid peroxidation; CISD1 expression is iron-dependently upregulated by erastin; genetic inhibition of CISD1 increases iron-mediated mitochondrial lipid peroxidation; pioglitazone-mediated stabilization of the Fe-S cluster inhibits mitochondrial iron uptake and lipid peroxidation. |
shRNA/siRNA knockdown, pioglitazone treatment, mitochondrial iron and lipid peroxidation measurements, erastin-induced ferroptosis model |
Biochemical and biophysical research communications |
High |
27510639
|
| 2016 |
Only the oxidized [2Fe-2S]²⁺ state of mitoNEET is active in cluster transfer to acceptor proteins; the reduced [2Fe-2S]⁺ state is a dormant form resistant to cluster loss; dioxygen is not required for transfer and does not affect transfer rate; mitoNEET thus uses an iron-based redox switch to regulate cluster transfer. |
Controlled spectroscopic reduction/oxidation, anaerobic cluster transfer assays, UV-vis and EPR spectroscopy |
The Journal of biological chemistry |
High |
26887944
|
| 2016 |
β-cell-specific overexpression of mitoNEET causes hyperglycemia via activation of a Parkin-dependent mitophagic pathway with vacuole and mitophagosome formation; α-cell-specific mitoNEET induction leads to hypoglycemia and protective effects on β-cells. |
Cell-type-specific transgenic mouse models, histology, electron microscopy of mitophagosomes, glucose tolerance tests |
Diabetes |
Medium |
26895793
|
| 2016 |
Flavin mononucleotide (FMN) but not FAD has a specific interaction with mitoNEET (EPR evidence); reduced flavin nucleotides rapidly reduce mitoNEET [2Fe-2S] clusters as electron shuttles, with one FMN molecule reducing ~100 mitoNEET clusters in 4 min. |
EPR spectroscopy, UV-vis absorption, flavin reductase/NADH assay system, molecular docking |
Free radical biology & medicine |
Medium |
27923678
|
| 2017 |
mitoNEET is a redox enzyme that catalyzes electron transfer from FMNH₂ to oxygen or ubiquinone via its [2Fe-2S] clusters; ubiquinone-2 is a more efficient oxidant than O₂; pioglitazone inhibits this electron transfer activity by forming a unique complex with mitoNEET and FMNH₂. |
In vitro reconstituted electron transfer assay (FMN/NADH/flavin reductase system), UV-vis spectroscopy, anaerobic and aerobic conditions |
The Journal of biological chemistry |
High |
28461337
|
| 2017 |
mitoNEET KO cells show reduced frequency of intermitochondrial junctions and decreased total mitochondrial volume (reducing cellular respiration); mitoNEET overexpression strongly increases intermitochondrial contacts and causes mitochondrial clustering; a mitoNEET mutant resistant to oxidative stress increases H₂O₂ resistance of the mitochondrial network. |
3D-EM reconstruction, thin-section EM, respiration assays in KO cells, re-expression rescue experiments |
Proceedings of the National Academy of Sciences of the United States of America |
High |
28716905
|
| 2017 |
mitoNEET and NAF-1 (CISD2) directly interact in mammalian cells; mitoNEET can transfer its [2Fe-2S] clusters to NAF-1 in vitro; single and double shRNA knockdown establishes they function in the same cellular pathway controlling mitochondrial iron and ROS. |
Yeast two-hybrid, in vivo bimolecular fluorescence complementation (BiFC), direct coupling analysis, in vitro cluster transfer assay, shRNA knockdown with iron/ROS imaging |
PloS one |
High |
28426722
|
| 2017 |
The cytosolic electron donor complex Ndor1/anamorsin (CIA machinery) reduces mitoNEET [2Fe-2S] clusters via transient protein-protein interaction, bringing their clusters into proximity; this provides a direct mechanistic link between CIA machinery and the mitoNEET cluster transfer/repair pathway. |
UV-vis and NMR spectroscopy in vitro, complex formation characterization |
Journal of the American Chemical Society |
Medium |
28648056
|
| 2017 |
Loss of mitoNEET in striatum results in mitochondrial dysfunction (elevated ROS, reduced ATP production), loss of striatal dopamine and tyrosine hydroxylase, shortened gait, and reduced rotarod performance, consistent with a Parkinson's disease-like phenotype. |
CISD1 knockout mice, isolated mitochondria ROS and ATP assays, immunohistochemistry for TH/dopamine, gait analysis, rotarod |
ACS chemical neuroscience |
Medium |
28880525
|
| 2018 |
pH regulates mitoNEET cluster transfer activity around physiological cytosolic pH; mitoNEET is highly resistant to H₂O₂ compared to other Fe-S cluster transfer proteins (ISCU, SufB); only one of two mitoNEET clusters is transferred when the other is decomposed; direct cluster transfer to apo-ferredoxin (not via intermediary) is confirmed. |
In vitro cluster transfer assays at varying pH, H₂O₂ resistance assays vs. ISCU/SufB, biophysical approaches (native MS, spectroscopy) |
Biochemistry |
High |
30204426
|
| 2018 |
Electron transfer kinetics of mitoNEET: FMNH₂ rapidly reduces [2Fe-2S] clusters; O₂ oxidizes reduced clusters at ~6 M⁻¹s⁻¹; ubiquinone-2 oxidizes them at ~3×10³ M⁻¹s⁻¹, ~500-fold faster than O₂, supporting ubiquinone as the intrinsic electron acceptor in mitochondria. |
Stopped-flow kinetics, UV-vis spectroscopy under anaerobic and aerobic conditions |
Free radical biology & medicine |
High |
29704621
|
| 2019 |
Oxidized mitoNEET gates VDAC1 in a redox-dependent manner; mitoNEET binds VDAC1 at the DIDS-sensitive site in vitro; the VDAC inhibitor DIDS prevents both mitoNEET–VDAC1 binding in vitro and mitoNEET-dependent mitochondrial iron accumulation in situ, indicating mitoNEET closes VDAC1 to regulate metabolite flow. |
In vitro binding assay, DIDS inhibitor studies in cells and in vitro, mitochondrial iron accumulation assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
31527235
|
| 2019 |
AGBE (glycogen branching enzyme) binds specifically to holo-IRP1 (aconitase) and to mitoNEET; this interaction facilitates nuclear translocation of holo-IRP1, demonstrating mitoNEET as part of a complex regulating iron-dependent gene expression. |
Co-immunoprecipitation, genetic studies in Drosophila, nuclear fractionation |
Nature communications |
Medium |
31784520
|
| 2019 |
Crystal structure of mitoNEET soluble domain bound to sulfonamide ligand furosemide was determined; structural basis of drug binding site on mitoNEET was elucidated for rational drug design. |
X-ray crystallography of mitoNEET–furosemide complex |
Communications chemistry |
High |
32382661
|
| 2020 |
FMN (and lumiflavin) forms a specific covalent complex with mitoNEET under blue light exposure near the [2Fe-2S] cluster; lumichrome (FMN analog lacking ribityl and phosphate) cannot mediate cluster redox transition and acts as a competitive inhibitor, mapping the FMN binding site. |
EPR spectroscopy, UV-vis, blue-light cross-linking, FMN analog comparison |
Free radical biology & medicine |
Medium |
32445867
|
| 2020 |
Pioglitazone-mediated neuroprotection after TBI requires mitoNEET: pioglitazone mitigates Ca²⁺-induced mitochondrial dysfunction and provides neuroprotection in WT mice but not in mitoNEET-null mice, establishing mitoNEET as the necessary mediator of pioglitazone's neuroprotective effects. |
WT and CISD1-null mouse TBI model, Ca²⁺-induced mitochondrial dysfunction assay, neuroprotection endpoints |
Experimental neurology |
High |
32057797
|
| 2020 |
Single-molecule AFM force spectroscopy shows the Fe-N(His87) bond is the mechanically weakest point of the [2Fe-2S] cluster and its rupture can be independent of cluster break, enabling multiple unfolding pathways and a Fe₂S₂(Cys)₃ intermediate. |
AFM-based single-molecule force spectroscopy (AFM-SMFS) |
Analytical chemistry |
Medium |
33048522
|
| 2021 |
Cardiac-specific deletion of CISD1 results in mitochondrial morphological abnormalities and elevated ROS at early time points, progressing to cardiac dysfunction at 12 months and heart failure by 16 months, demonstrating mitoNEET is required for maintaining cardiac mitochondrial integrity during aging. |
Cardiac-specific CISD1 KO mouse on C57BL/6J background, echocardiography, electron microscopy, ROS measurements |
Communications biology |
High |
33514783
|
| 2021 |
Pioglitazone stabilizes the labile Fe(III)-N(His87) bond of the mitoNEET cluster ~10-fold (by AFM-SMFS), while reducing dissociation of other protein regions only ~3-fold; this Fe-N bond stabilization is the primary mechanism by which pioglitazone inhibits metal cluster transfer. |
AFM-based single-molecule force spectroscopy with a mitoNEET homodimer polyprotein construct |
The journal of physical chemistry letters |
Medium |
33856229
|
| 2022 |
mitoNEET binds pyridoxal phosphate (PLP) specifically at Lys55 and catalyzes transamination of cysteine and 2-oxoglutarate to form 3-mercaptopyruvate and glutamate, demonstrating cysteine transaminase enzymatic activity. |
PLP binding assay (Lys55-specific), in vitro transamination assay with amino acid substrates |
ACS chemical biology |
Medium |
36194135
|
| 2022 |
Pharmacological inhibition of mitoNEET (NL-1 or rosiglitazone) induces PINK1-Parkin-mediated mitophagy; mitoNEET inhibition promotes Pink1/Parkin accumulation, mitochondria-lysosome crosstalk, and PGC-1α expression. |
NL-1 pharmacological inhibition, shRNA knockdown, Western blot of mitophagy markers (Pink1, Parkin, LC3), lysosome imaging in RAW264.7 cells |
BMB reports |
Medium |
35725011
|
| 2024 |
CISD1 accumulation in Pink1 and parkin mutant Drosophila forms aberrant disulfide-linked dimers incapable of coordinating the Fe-S cluster; elevated Cisd blocks mitophagy and impairs autophagy flux; genetic or pharmacological reduction of Cisd/CISD1 rescues locomotion, lifespan, dopamine levels, and mitochondrial ultrastructure in Pink1/parkin mutants, placing CISD1 downstream of PINK1 in the mitophagy pathway. |
Drosophila Pink1/parkin mutant genetics, human iPSC dopaminergic neurons, disulfide bond detection, mitophagy/autophagy flux assays, NL-1/rosiglitazone pharmacology, epistasis by genetic rescue |
Molecular neurodegeneration |
High |
38273330
|
| 2024 |
In Pink1 mutant flies and PINK1-mutant patient dopaminergic neurons, CISD1 forms aberrant disulfide-linked homodimers unable to bind the Fe-S cluster; overexpression of cluster-binding-deficient CISD1 worsens Pink1-mutant phenotypes, while complete loss of Cisd rescues all Pink1-mutant phenotypes, indicating that iron-depleted CISD1 is the pathogenic species operating downstream of PINK1. |
Drosophila genetics, human patient-derived dopaminergic neurons, disulfide dimer characterization, gain/loss-of-function with Fe-S binding mutant, behavioral and lifespan assays |
eLife |
High |
39159312
|
| 2025 |
mitoNEET inhibition (NL-1) ameliorates TBI-induced ferroptosis and cognitive dysfunction through activation of the mitoNEET/DHODH (dihydroorotate dehydrogenase) signaling axis; silencing DHODH blocks the anti-ferroptosis effects of NL-1, establishing DHODH as a downstream effector of mitoNEET in ferroptosis defense. |
mitoNEET KO and overexpression in TBI mouse models, DHODH siRNA epistasis, NL-1 pharmacology, ferroptosis markers, cognitive testing |
Experimental neurology |
Medium |
40189124
|