| 2000 |
Mammalian Mog1 binds specifically to RanGTP and stimulates guanine nucleotide release from Ran in vitro, functioning as a guanine nucleotide release factor; after GTP release, Mog1 remains bound to nucleotide-free Ran in a conformation that prevents rebinding of guanine nucleotide, distinguishing it mechanistically from the canonical RanGEF. |
In vitro biochemical assay (GTP release assay), binding assay with RanGTP |
The Journal of biological chemistry |
High |
10811801
|
| 2001 |
Mog1 residues Asp25, Asp34, and Glu37 within a conserved solvent-exposed loop are critical for GTP release and Ran binding; mutation of Arg30 renders Mog1 hyperactive for GTP release. This loop is functionally analogous to the beta-wedge of RanGEF. Mog1 undergoes nuclear import via physical interactions with the nuclear pore complex (inhibited by wheat germ agglutinin) independently of exogenously added factors, and shuttles between nucleus and cytoplasm. |
Site-directed mutagenesis of acidic/basic residues, in vitro GTP release assay, nuclear import assay in permeabilized cells, wheat germ agglutinin inhibition |
Traffic (Copenhagen, Denmark) |
High |
11733047
|
| 2001 |
The Mog1-Ran interaction interface involves conserved Mog1 residues Asp62 and Glu65, and Ran residue Lys136; mutations at these residues decrease Mog1's ability to bind and release nucleotide from Ran, and cause temperature sensitivity and mislocalization of a nuclear import reporter protein in yeast, demonstrating that Mog1-Ran interaction is necessary for efficient nuclear protein import in vivo. MOG1 shows synthetic lethality with PRP20 (RanGEF). |
Site-directed mutagenesis, in vitro binding and GTP release assay, yeast genetics (synthetic lethality, nuclear import reporter mislocalization) |
The Journal of biological chemistry |
High |
11509570
|
| 2001 |
Human MOG1 protein binds to both yeast and human Ran, is concentrated within the nucleus (but also present throughout the cell), and can partially complement growth defects in yeast MOG1-deletion cells, indicating functional conservation of the Ran-binding and nuclear trafficking roles. |
Co-immunoprecipitation / binding assay (yeast and human Ran), subcellular localization (immunofluorescence), yeast complementation assay |
Gene |
Medium |
11290418
|
| 2007 |
In yeast, Mog1 deletion dislocates phospholipid N-methyltransferase Opi3p from the nuclear membrane; fission yeast mog1(ts) causes nuclear accumulation of mRNA and is rescued by Cid13 (poly-A polymerase for suc22 mRNA), Crp79 (mRNA export factor), and Ssp1 (stress-response kinase). SpMog1 co-precipitates with Nxt2 and Cid13, implicating Mog1 in mRNA export. |
Suppressor screen (multi-copy rescue), fluorescence microscopy (mRNA export assay), co-immunoprecipitation |
Gene |
Medium |
17651922
|
| 2008 |
MOG1 interacts with the cytoplasmic Loop II (between transmembrane domains DII and DIII) of Nav1.5, as identified by yeast two-hybrid, GST pull-down, and co-immunoprecipitation in HEK293 cells and native cardiac cells. Co-expression of MOG1 with Nav1.5 increases sodium current density and cell-surface expression of Nav1.5. MOG1 co-localizes with Nav1.5 at the intercalated discs and plasma membrane of cardiomyocytes. |
Yeast two-hybrid, GST pull-down, co-immunoprecipitation, patch-clamp electrophysiology, Western blot (surface expression), immunofluorescence/confocal microscopy |
The Journal of biological chemistry |
High |
18184654
|
| 2011 |
The MOG1 missense mutation E83D (Brugada syndrome patient) fails to increase sodium current density when overexpressed and exerts a dominant-negative effect on wild-type MOG1 function; Nav1.5 fails to traffic properly to the cell membrane in the presence of E83D-MOG1. Silencing endogenous MOG1 with siRNA reduced INa density by 54%. |
Patch-clamp electrophysiology, siRNA knockdown, microscopy (trafficking), overexpression in HEK-Nav1.5 stable cells |
Circulation. Cardiovascular genetics |
High |
21447824
|
| 2011 |
The nonsense variant p.E61X in MOG1/RANGRF completely eliminates the sodium current-increasing effect of MOG1 when expressed in CHO-K1 cells co-expressing Nav1.5; mimicking heterozygosity by co-expression with wild-type MOG1 did not reduce current, indicating no dominant-negative effect for this variant. |
Patch-clamp electrophysiology in CHO-K1 cells, co-expression with Nav1.5 |
The Canadian journal of cardiology |
Medium |
21621375
|
| 2013 |
MOG1 knockdown (siRNA) causes retention of Nav1.5 in the endoplasmic reticulum, disrupts the distribution of Nav1.5 into caveolin-3-enriched microdomains, and reduces plasma membrane expression and INa density. MOG1 does not affect Nav1.5 plasma membrane turnover. MOG1 overexpression rescues reduced plasma membrane expression and INa for the trafficking-defective Nav1.5 mutations D1275N and G1743R. |
siRNA knockdown, cell surface protein quantification, patch-clamp electrophysiology, subcellular fractionation/immunofluorescence (ER retention, caveolin-3 microdomains), overexpression rescue assay |
Circulation. Arrhythmia and electrophysiology |
High |
23420830
|
| 2016 |
Knockdown of mog1 in zebrafish embryos decreases heart rate and causes abnormal cardiac looping during embryogenesis; overexpression of human MOG1 increases heart rate. Mechanistically, mog1 knockdown reduces expression of hcn4 (pacemaker channel), nkx2.5, gata4, and hand2 (cardiac morphogenesis transcription factors). |
Zebrafish morpholino knockdown, mog1 mRNA overexpression, heart rate measurement, whole-mount imaging, RT-PCR/gene expression analysis |
Scientific reports |
Medium |
26903377
|
| 2018 |
The MOG1 domain required for interaction with Nav1.5 maps to amino acids 146–155, with Asp148, Arg150, and Ser151 forming a peptide loop essential for Nav1.5 binding. The BrS-associated substitution E83D and mutations D148Q, R150Q, S151Q disrupt MOG1-Nav1.5 interaction and significantly reduce Nav1.5 trafficking to the cell surface. Structural analysis indicates that Glu83 and the loop containing Asp148/Arg150/Ser151 are spatially proximal, forming a critical Nav1.5 binding site. |
Large deletion analysis, alanine-scanning mutagenesis, site-directed mutagenesis, GST pull-down, patch-clamp electrophysiology, cell surface protein quantification, 3D structural analysis |
The Journal of biological chemistry |
High |
30282806
|
| 2018 |
In Saccharomyces cerevisiae, Mog1 is required to sustain normal levels of histone H2B monoubiquitination (H2Bub1) and H3K4me3; Mog1 is needed for gene-body recruitment of Rad6, Bre1, and Rtf1 (H2B ubiquitination machinery). Mog1 co-precipitates with Bre1, Rtf1, and COMPASS-associated factors Shg1 and Sdc1. Loss of MOG1 impacts transcription, DNA replication, and mRNA export linked to H2Bub1. |
ChIP, co-immunoprecipitation, genetic interaction analysis, mRNA export assay, chromatin immunoprecipitation |
EMBO reports |
Medium |
30249596
|
| 2020 |
Mog1 knockout zebrafish develop cardiac hypertrophy and heart failure. Mechanistically, mog1 knockout decreases tbx5 expression, which reduces cryab and hspb2 expression, causing cardiac hypertrophy; overexpression of cryab, hspb2, or tbx5 rescues the cardiac edema phenotype. Mog1 KO also causes QRS and QTc prolongation, reduced heart rate associated with reduced scn1b expression, and abnormal cardiac looping associated with reduced nkx2.5, gata4, and hand2 expression. |
TALEN-generated knockout zebrafish, echocardiography, RNA-seq, KEGG pathway analysis, RT-PCR, rescue by overexpression (cryab, hspb2, tbx5), whole-mount in situ hybridization, telemetry ECG |
Acta physiologica (Oxford, England) |
Medium |
33032360
|
| 2021 |
The MOG1-Nav1.5 interaction domain on Nav1.5 maps to Loop I (connecting transmembrane domains I and II), specifically to the five-amino-acid motif F530-T531-F532-R533-R534; mutations F530A, F532A, R533A, and R534A significantly reduce MOG1-Nav1.5 interaction and eliminate MOG1-enhanced INa. On the MOG1 side, residues D24, E36, D44, E53, and E101 are critical for interaction with Nav1.5 Loop I. BrS-associated mutation p.F532C abolishes Nav1.5 interaction with MOG1 and reduces MOG1-enhanced INa. |
Large deletion analysis, microdeletion analysis, site-directed mutagenesis, GST pull-down, co-immunoprecipitation, cell surface protein quantification, patch-clamp electrophysiology |
Heart rhythm |
High |
34843967
|
| 2022 |
AAV9-mediated MOG1 gene therapy in a Scn5a knock-in Brugada syndrome mouse model increased cell surface expression of Nav1.5, increased ventricular INa, reversed upregulation of Kcnd3 and Cacna1c, normalized cardiac action potentials, abolished J waves, and blocked ventricular tachyarrhythmias. MOG1 acts as a chaperone that binds Nav1.5 and traffics it to the cell surface. |
AAV9 gene delivery in knock-in mouse model, patch-clamp electrophysiology, ECG, Western blot (surface expression), action potential recording |
Science translational medicine |
High |
35675436
|
| 2022 |
Mog1-/- (knockout) mice exhibit prolonged QRS duration, LV systolic dysfunction, increased ventricular fibrosis, and isoproterenol-induced arrhythmias and sudden death. Notably, cardiac expression and function of Nav1.5 are normal in Mog1-/- mice at baseline. Mog1 deficiency reduces cardiac Cx43 (Gja1) expression and impairs gap-junction function; treatment with Cx43 gap-junction enhancer ZP123 decreased arrhythmia inducibility. Mog1 KO also dysregulates Mmp2, mitochondrial dynamics, and increases ATP supply. |
Mog1 knockout mouse, whole-cell patch-clamp, RNA-seq, iTRAQ proteomics, RT-qPCR, Western blot, immunofluorescence, dye transfer assay (gap junction function), transmission electron microscopy, isoproterenol challenge |
Biochimica et biophysica acta. Molecular basis of disease |
High |
35533905
|
| 2025 |
The MOG1-Nav1.5 interaction domain in Nav1.5 Loop II (residues 940–1200) maps to V1190-H1200; point mutations reveal R1195, Y1199, and H1200 as critical for MOG1-Nav1.5 Loop II interaction. Patient variants p.R1195C and p.Y1199S weaken MOG1-Nav1.5 interaction and reduce MOG1-enhanced INa; p.Y1199S additionally generates late INa. These variants are associated with LQTS and cardiac arrhythmias. |
Large deletion analysis, small deletion analysis, site-directed mutagenesis, GST pull-down, patch-clamp electrophysiology (INa and late INa) in tsA201 cells and neonatal rat cardiomyocytes |
Journal of molecular and cellular cardiology |
High |
40543898
|
| 2025 |
MOG1 variant L18F (identified in a LQTS proband) increases late sodium current (INaL) and enhances NaV1.8 expression at the sarcolemma in ventricular cardiomyocytes; this prolongs action potential duration and causes EADs, DADs, and triggered activity. The NaV1.8 inhibitor A-803467 reversed the cellular electrophysiological effects of MOG1L18F and reduced arrhythmia inducibility in vivo. NaV1.8 interacts with both MOG1 and NaV1.5. |
AAV9-mediated cardiac-specific mouse model, surface ECG, programmed electrical stimulation, optical mapping, patch-clamp (INaL, action potential), Ca2+ dynamics, Western blot/immunofluorescence (surface NaV1.8), pharmacological inhibition (A-803467) |
medRxivpreprint |
Medium |
41445668
|