| 2002 |
Myo1c is present in GLUT4-containing vesicles purified from 3T3-L1 adipocytes and functions in a PI(3)K-independent insulin signaling pathway that controls movement of intracellular GLUT4-vesicles to the plasma membrane; dominant-negative Myo1c cargo domain inhibits insulin-stimulated GLUT4 translocation, and siRNA-mediated knockdown of Myo1c inhibits insulin-stimulated 2-deoxyglucose uptake. |
Subcellular fractionation/vesicle purification, dominant-negative overexpression, siRNA knockdown, glucose uptake assay, colocalization imaging in adipocytes |
Nature |
High |
12490950
|
| 2004 |
Myo1c promotes membrane fusion of GLUT4-containing vesicles with the plasma membrane in adipocytes; enhanced Myo1c expression overrides PI3K inhibitor-induced block of membrane fusion and causes membrane ruffling that mobilizes GLUT4 vesicles to the cell surface. |
Overexpression in 3T3-L1 adipocytes with PI3K inhibitor LY294002, ultrafast microscopy of GLUT4-GFP vesicle dynamics |
Molecular and cellular biology |
High |
15169906
|
| 2007 |
RalA interacts directly with Myo1c and functions as a cargo receptor for the Myo1c motor during insulin-stimulated GLUT4 trafficking; calmodulin, acting as Myo1c light chain, modulates the RalA–Myo1c interaction. RalA also links the exocyst complex to GLUT4 vesicle tethering at the plasma membrane. |
Co-immunoprecipitation, dominant-negative and siRNA knockdown of RalA, glucose transport assay in adipocytes |
Developmental cell |
High |
17765682
|
| 2006 |
Myo1c interacts with NEMO/IKK-γ and is required for insulin-dependent trafficking of NEMO to membrane ruffles, where NEMO interacts with IRS-1; this Myo1c–NEMO axis is essential for TNF-α-induced serine-307 phosphorylation of IRS-1 and the resulting insulin resistance. |
Co-immunoprecipitation, dominant-negative Myo1c cargo domain overexpression, siRNA knockdown, immunofluorescence, phospho-IRS-1 immunoblotting |
The Journal of cell biology |
High |
16754954
|
| 2008 |
CaMKIIδ phosphorylates Myo1c at serine 701 in response to insulin, leading to enhanced 14-3-3 binding and reduced calmodulin binding; phosphorylation increases Myo1c ATPase activity in vitro, and the phosphorylation-mimetic but not S701A or ATPase-dead (K111A) Myo1c rescues GLUT4 translocation after siRNA knockdown of endogenous Myo1c. |
In vitro CaMKII phosphorylation assay, siRNA knockdown of CaMKIIδ, mutagenesis (S701A, K111A), ATPase activity assay, GLUT4 translocation assay |
Cell metabolism |
High |
19046570
|
| 2008 |
Rictor forms a biochemically distinct complex with Myo1c in adipocytes (separate from mTORC2); this Rictor–Myo1c complex participates in cortical actin remodeling and paxillin tyrosine-118 phosphorylation, and Myo1c-induced membrane ruffling is compromised after Rictor knockdown. |
Co-immunoprecipitation distinct from mTOR complex, RNAi depletion of Rictor and Myo1c, paxillin phosphorylation immunoblotting, morphological analysis of membrane ruffles |
Molecular and cellular biology |
High |
18426911
|
| 2007 |
Calcium binding to regulatory-domain-associated calmodulin regulates myo1c motor activity: calcium moderately increases actin-activated ATPase but completely inhibits actin gliding; calmodulin dissociates most rapidly from IQ1 (adjacent to motor domain) in the presence of calcium (rate 60 s⁻¹), limited by a slow calcium-induced conformational change (3 s⁻¹), making IQ1-bound calmodulin the primary site of calcium regulation. |
Actin gliding assay, ATPase measurements, stopped-flow fluorescence kinetics, fluorescence anisotropy with labeled calmodulin mutant N111C, peptide binding assays |
Biochemistry |
High |
17910470
|
| 2007 |
CIB1 and CaBP1 bind to the myo1c IQ motifs in the regulatory domain, compete with calmodulin for binding (more effectively in the presence of calcium), and colocalize with endogenous myo1c in cells; these myristoylated calcium-binding proteins may specify myo1c subcellular targeting. |
Pull-down experiments, fluorescence microscopy colocalization, competitive binding assays with calmodulin |
Journal of muscle research and cell motility |
Medium |
17994197
|
| 2010 |
Expression of wild-type Myo1c in mouse tibialis anterior muscle in vivo significantly increases both contraction-stimulated and insulin-stimulated glucose uptake, whereas expression of the ATPase-dead mutant K111A-Myo1c decreases both, demonstrating that Myo1c motor activity is required for glucose uptake in skeletal muscle. |
In vivo electroporation of wild-type and K111A mutant Myo1c into mouse tibialis anterior, in vivo glucose uptake assay after contraction and insulin injection |
The Journal of biological chemistry |
High |
21127070
|
| 2011 |
Myo1c directly interacts with the podocyte slit diaphragm protein Neph1 in an actin-dependent manner and mediates Neph1 transport to the podocyte cell membrane; dominant-negative Myo1c or Myo1c depletion significantly reduces Neph1 membrane localization and impairs tight junction formation and cell migration. |
In vitro and in vivo co-immunoprecipitation, dominant-negative Myo1c overexpression, siRNA knockdown, transepithelial electric resistance, BSA permeability assay, wound migration assay |
Molecular and cellular biology |
High |
21402783
|
| 2011 |
A hearing-loss-associated myo1c point mutation R156W (in switch 1 region) decreases the actin-activated ATPase rate >4-fold (likely by reducing phosphate release), reduces the duty ratio, and renders actin gliding less sensitive to resisting forces in a frictional loading assay, without affecting ATP binding or ADP release rates substantially. |
Transient kinetic ATPase analysis at 37°C, in vitro motility assay at multiple myosin densities, frictional loading assay using recombinant myo1c(3IQ) and R156W-myo1c(3IQ) |
Biochemistry |
High |
21265502
|
| 2012 |
Myo1c is a lipid-raft-associated motor protein that drives formation of recycling tubules from the perinuclear recycling compartment, selectively promoting recycling of GPI-linked raft cargo (but not transferrin receptor) back to the cell surface via an Arf6-dependent pathway; loss of Myo1c traps GPI-linked proteins in the recycling compartment and impairs cell spreading, migration, and Salmonella invasion. |
RNAi knockdown, dominant-negative overexpression, live-cell imaging of recycling tubules, biochemical lipid raft fractionation, Salmonella invasion assay, wound healing/migration assay |
Journal of cell science |
High |
22328521
|
| 2012 |
Myo1c associates with both mobile and tethered GLUT4 vesicles in the TIRF zone beneath the plasma membrane of muscle cells; Myo1c knockdown or overexpression of an actin-binding-deficient mutant abolishes insulin-induced vesicle immobilization and increases vesicle velocity, preventing GLUT4 externalization. Interaction of vesicular Myo1c with cortical actin filaments is required for insulin-mediated tethering of GLUT4 vesicles. |
TIRF microscopy of GLUT4-GFP vesicle dynamics, siRNA knockdown, actin-binding-deficient mutant overexpression, single-vesicle tracking, GLUT4 surface exposure assay |
Molecular biology of the cell |
High |
22918957
|
| 2012 |
Myo1c identifies G-actin as a cargo via its tail domain and transports G-actin (actin monomers) vectorially to the leading edge of migrating endothelial cells; the motor domain is required for transport. Local microinjection of Myo1c promotes G-actin accumulation and membrane ruffling, and Myo1c knockdown reduces G-actin delivery to the leading edge and impairs cell motility. |
Mass spectrometric identification of G-actin as Myo1c tail interactor, photoactivatable non-polymerizable actin tracking in live cells, Myo1c microinjection, siRNA knockdown with motility readout |
The Journal of cell biology |
High |
22778278
|
| 2012 |
Myo1c is required for VEGFR2 delivery to the endothelial cell plasma membrane in response to VEGF; Myo1c depletion increases VEGFR2 lysosomal degradation, reduces VEGFR2 phosphorylation at Y1175, and attenuates ERK1/2 and c-Src activation, leading to reduced cell proliferation and migration. VEGFR2 colocalizes with Myo1c and caveolin-1 in response to VEGF. |
siRNA knockdown in primary human endothelial cells, surface VEGFR2 measurement, subcellular density-gradient fractionation, phospho-VEGFR2/ERK/Src immunoblotting, rescue with WT vs mutant Myo1c |
American journal of physiology. Heart and circulatory physiology |
High |
23262137
|
| 2013 |
Myo1c is required for normal zebrafish glomerular development; morpholino knockdown of Myo1c in zebrafish causes pericardial edema, dilated renal tubules, abnormal podocyte morphology, and absence of the slit diaphragm, which is rescued by co-injection of mouse Myo1c mRNA. |
Antisense morpholino knockdown in zebrafish, immunofluorescence, in situ hybridization, electron microscopy, mRNA rescue experiment |
Kidney international |
High |
23715127
|
| 2014 |
Loss of functional MYO1C disrupts autophagosome–lysosome fusion: MYO1C depletion causes accumulation of cholesterol-enriched membranes, increases total cellular cholesterol, and blocks autophagic cargo degradation without affecting endocytic cargo (EGFR) degradation or lysosomal pH/hydrolase activity, indicating that correct lipid (cholesterol) composition governed by MYO1C is required for autophagosome–lysosome fusion. |
siRNA and dominant-negative knockdown, transmission electron microscopy, immunofluorescence for LC3/LAMP1, EGFR degradation assay, lysosomal activity assay, cholesterol quantification |
Autophagy |
High |
25551774
|
| 2010 |
Three hearing-loss-associated missense mutations in the Myo1c motor domain (R156W, V252A, T380M) differentially affect nucleotide binding and actin interactions: R156W disrupts the nucleotide-binding pocket and calcium binding by disrupting switch 1; V252A reduces actin affinity by disrupting communication between actin- and nucleotide-binding sites; T380M causes aberrant kinetic changes and uncoupling of ATPase from motility. |
Transient kinetic analyses, steady-state ATPase assay, in vitro motility assay, homology modeling with truncated Myo1c(1IQ-SAH) construct |
Cellular and molecular life sciences |
High |
20640478
|
| 2004 |
Nuclear myosin I (NMI/Myo1c isoform with 16-aa N-terminal extension) is associated with rDNA and is required for RNA polymerase I transcription; antibody microinjection or siRNA depletion of NMI decreases Pol I transcription, overexpression augments pre-rRNA synthesis, and in vitro recombinant NMI activates Pol I transcription. NMI binds Pol I through the transcription initiation factor TIF-IA, requiring phosphorylation of TIF-IA at Ser649 by RSK kinase. |
Antibody microinjection, siRNA depletion, overexpression, in vitro Pol I transcription assay on naked DNA and chromatin, co-immunoprecipitation of NMI with TIF-IA/Pol I, kinase dependency assay |
Nature cell biology |
High |
15558034
|
| 2000 |
A nuclear isoform of myosin I beta (Myo1c) containing a unique 16-amino acid N-terminal extension is identified; it colocalizes with RNA polymerase II in an alpha-amanitin- and actinomycin D-sensitive manner, co-immunoprecipitates RNA polymerase II, and antibody against the 16-aa extension blocks in vitro RNA synthesis. |
Affinity-purified antibody to 16-aa peptide, confocal and electron microscopy, co-immunoprecipitation, in vitro RNA synthesis inhibition assay |
Science |
High |
11030652
|
| 2008 |
Myosin I (myo1c) acts as a molecular force sensor: single-molecule optical trap measurements show that the rate of myo1c detachment from actin decreases >75-fold under tension of ≤2 pN, causing myo1c to transition from a low duty-ratio (<0.2) to a high duty-ratio (>0.9) motor, supporting its role in tension-sensitive membrane and cytoskeletal processes. |
Single-molecule optical trap assay measuring displacement and actin-attachment kinetics under varying loads |
Science |
High |
18599791
|
| 2016 |
The structural solution conformation of full-length Myo1c bound to its cargo protein Neph1 was determined by small-angle X-ray scattering, revealing an extended S-shaped Myo1c with Neph1 attached to the C-terminal tail without inducing significant conformational change in Myo1c. A critical Neph1 residue at the interaction surface was identified; point mutation at this site abolished Myo1c–Neph1 interaction in vitro and in live cells, and FRAP confirmed Myo1c-dependent vesicular movement of Neph1. |
Small-angle X-ray scattering (SAXS) structural modeling, point mutagenesis, in vitro binding assay, live-cell FRAP imaging |
Molecular and cellular biology |
High |
27044863
|
| 2017 |
The MYO1C gene produces three alternatively spliced isoforms differing only in N-terminal regions (NTRs); full-length kinetic analysis shows MYO1Cc favors the actomyosin closed state (AMC), MYO1C16 populates AMC and AMO equally, and MYO1C35 favors the actomyosin open (AMO) state. The NTR35 residue Arg-21 engages Glu-469 in the post-relay helix, affecting power stroke mechanics; an R21G mutation abolishes MYO1C35-like kinetics, and adding NTR35 peptide to MYO1Cc transiently confers MYO1C35 behavior. |
Overexpression and purification of three full-length isoforms from HEK cells, transient kinetics, global numerical simulation, homology modeling, NTR peptide addition experiments, mutagenesis |
The Journal of biological chemistry |
High |
28893906
|
| 2019 |
MYO1C depletion causes Golgi complex fragmentation and decompaction and loss of cellular F-actin; MYO1C accumulates at dynamic Golgi-associated actin dots and stabilizes actin at the Golgi, facilitating the arrival of both anterograde and retrograde transport carriers. This function is phenotypically similar to loss of the Arp2/3 complex. |
siRNA depletion, live-cell imaging of Golgi-associated structures, F-actin quantification, transport carrier arrival assay (anterograde and retrograde routes) |
Journal of cell science |
High |
30872458
|
| 2019 |
Podocyte-specific Myo1c knockout mice are resistant to fibrotic injury (Adriamycin, nephrotoxic serum, unilateral ureteral obstruction); loss of Myo1c blunts canonical and non-canonical TGF-β signaling. Nuclear Myo1c directly binds the GDF-15 promoter and transcriptionally regulates this TGF-β-responsive gene, and GDF15 is upregulated in FSGS patient glomeruli. |
Conditional (podocyte-specific) Myo1c knockout mouse models, multiple injury paradigms, ChIP for nuclear Myo1c at GDF-15 promoter, differential gene expression analysis of nuclear Myo1c-associated promoters, TGF-β pathway immunoblotting |
Kidney international |
High |
31097328
|
| 2019 |
Cepharanthine downregulates MYO1C, which in turn disrupts MYO1C/F-actin interaction with autophagic markers LC3 and LAMP1, blocking autophagosome–lysosome fusion; overexpression of MYO1C restores this colocalization. MYO1C promotes autophagosome–lysosome fusion through F-actin network remodeling. |
Co-immunoprecipitation of MYO1C with LC3/LAMP1, siRNA knockdown and overexpression, immunofluorescence colocalization, transmission electron microscopy |
Journal of experimental & clinical cancer research |
Medium |
31699152
|
| 2021 |
Systemic MYO1C knockout mice show progressive loss of photoreceptor function; MYO1C localizes to photoreceptor inner and outer segments and directly interacts with rhodopsin (binding assay); in Myo1c-KO retinas, rhodopsin mislocalizes to rod inner segments and cell bodies, demonstrating MYO1C is required for rhodopsin transport to the outer segment. |
Myo1c knockout mice, electroretinogram analysis, immunohistochemistry, direct rhodopsin–MYO1C binding assay, ultrastructural examination |
Cells |
High |
34073294
|
| 2016 |
Myo1c interacts with SHIP2 and filamin A in glioblastoma cells; Myo1c depletion impairs SHIP2 localization at lamellipodia, causes cells to cluster, reduces FAK Tyr397 phosphorylation, decreases focal adhesion length, and strongly reduces cell migration, demonstrating Myo1c is required for lamellipodia formation and a SHIP2-containing migration complex. |
Co-immunoprecipitation identifying Myo1c–SHIP2–filamin A complex, siRNA knockdown, immunofluorescence of lamellipodia, FAK phosphorylation immunoblotting, migration assay |
Biochemical and biophysical research communications |
Medium |
27246739
|
| 2016 |
Lowered MYO1C expression in endometrial carcinoma cells stimulates cell proliferation, suppresses cell adhesion, and accelerates AKT phosphorylation in response to serum; conversely, MYO1C overexpression reduces basal pAKT, suggesting MYO1C suppresses the PI3K/AKT pathway. |
siRNA knockdown and overexpression in endometrial carcinoma cell lines, proliferation assay, adhesion assay, pAKT immunoblotting after serum stimulation |
PloS one |
Medium |
27716847
|
| 2005 |
Myo1c expressed in M1 mouse collecting duct cells localizes to discrete plasma membrane domains; expression of full-length or truncated (dominant-negative, lacking ATPase/actin domains) Myo1c modulates antidiuretic hormone (ADH)-stimulated short-circuit current and reduces amiloride-sensitive Na+ channel activity; the IQ region is required for proper Myo1c targeting. |
Overexpression of WT and truncated Myo1c in M1 cells, electrophysiological short-circuit current measurements, EGFP-Myo1c targeting analysis |
American journal of physiology. Cell physiology |
Medium |
15716323
|
| 2024 |
Liraglutide directly binds Myo1c at arginine 93, stabilizing Myo1c and enhancing the Myo1c/Dock5 interaction; this promotes Dock5-dependent keratinocyte proliferation, migration, and adhesion to accelerate diabetic wound healing. Keratinocyte-specific Dock5 knockout abrogates liraglutide's wound-healing effect. |
Molecular binding assay (liraglutide–Myo1c at R93), co-immunoprecipitation of Myo1c/Dock5, keratinocyte-specific Dock5 knockout mouse, wound closure assay in db/db and STZ diabetic mice |
Advanced science |
Medium |
39159301
|
| 2024 |
RNF41 E3 ubiquitin ligase induces non-canonical K27- and K63-linked polyubiquitination of MYO1C to enhance its stability (rather than degradation), promoting actin remodeling and prostate cancer bone metastasis; inhibition of RNF41 reduces MYO1C levels and suppresses PCa metastasis in an intraarterial bone-metastasis xenograft model. |
Co-immunoprecipitation, ubiquitination assay defining K27/K63 linkage, RNF41 siRNA knockdown, in vivo bone-metastasis xenograft model, MYO1C rescue |
Oncogene |
Medium |
39112516
|
| 2025 |
Cryo-EM structures of actin-bound myo1c in the presence and absence of ADP reveal a unique actin interface that reorients the motor domain compared with myo1b/other myosins, skewing the lever arm swing and explaining why myo1c propels actin in leftward circles. The N-terminal extension plays a unique role in force sensing. The structures explain why force primarily regulates ATP binding (not ADP release) in myo1c, and enable modeling of full-length myo1c during force generation. |
Cryo-EM structure determination of actin-bound myo1c ± ADP, integration with crystallography structures for full-length modeling |
bioRxivpreprint |
High |
bio_10.1101_2025.01.10.632429
|
| 2025 |
Nuclear Myo1c (NM1) positively regulates ERα clustering on enhancers and promotes condensate formation on chromatin genome-wide; NM1 depletion causes a genome-wide reduction in ERα occupancy and condensates, though estrogen-regulated gene expression remains largely robust, revealing a role for Myo1c in transcription factor clustering without strictly controlling transcriptional output. |
ChIP-seq for ERα occupancy, super-resolution/condensate imaging, NM1 depletion by siRNA, genome-wide analysis in estrogen-stimulated cells |
bioRxivpreprint |
Medium |
bio_10.1101_2025.01.29.635522
|
| 2025 |
Chlamydia trachomatis recruits MYO1C to its intracellular inclusion throughout its lifecycle; loss or inhibition of MYO1C activity reduces Ct infection and progeny production. In vitro reconstitution showed that purified MYO1C alone is necessary and sufficient to build an actin cage around giant membranous vesicles, functioning as a dynamic tether that assembles the actin cage around the inclusion membrane. |
Immunofluorescence of Ct-infected cells, MYO1C inhibition (pentachloropseudilin), siRNA depletion, in vitro reconstitution assay with purified MYO1C and giant membranous vesicles |
Microbiological research |
High |
41242206
|
| 2007 |
Emerin directly binds nuclear myosin I (NMI/Myo1c) in vitro; bead-conjugated emerin affinity-purifies NMI from HeLa nuclear lysates, and this interaction is stable regardless of ATP (motor activity), placing NMI in a distinct emerin-containing complex at the nuclear envelope separate from gene-regulatory complexes. |
Recombinant bead affinity purification from HeLa nuclear lysates, in vitro direct binding assay, ATP-independence test, mass spectrometry identification |
Biochemistry |
Medium |
17620012
|
| 2025 |
MYO1C interacts with Jagged1 (Notch ligand) under static conditions in endothelial cells, as confirmed by coimmunoprecipitation; shear stress reduces this interaction. Myo1c knockout inhibits Jagged1 polarization downstream of shear and its nucleograde transport, while Myo1c knockdown reduces membrane levels of Jagged1 under static but not shear conditions, revealing a role for Myo1c in hemodynamic control of Jagged1 localization. |
Jagged1-APEX2 proximity labeling, co-immunoprecipitation, Myo1c knockout/knockdown, orbital shaker shear stress platform, confocal imaging of Jagged1 localization |
iScience |
Medium |
41321631
|