| 2009 |
IDOL (MYLIP) is an E3 ubiquitin ligase transcriptionally induced by LXR that triggers ubiquitination of the LDLR on its cytoplasmic domain, targeting it for degradation and thereby limiting LDL uptake. Knockdown of Idol in hepatocytes increases LDLR protein levels and LDL uptake; adenoviral overexpression in mouse liver promotes LDLR degradation and elevates plasma LDL levels. |
siRNA knockdown, adenoviral overexpression in mouse liver, ubiquitination assays, LXR knockout mice |
Science |
High |
19520913
|
| 2010 |
IDOL also targets VLDLR and ApoER2 (closely related LDLR family members) for ubiquitination on their cytoplasmic tails, leading to their lysosomal degradation. LXR activation in mice increases Idol expression and decreases Vldlr levels in vivo. IDOL-mediated VLDLR degradation reduces Reelin binding to VLDLR and decreases Dab1 phosphorylation. |
Ubiquitination assays, pharmacological LXR activation in mice, siRNA knockdown, Reelin binding assay, Dab1 phosphorylation measurement |
The Journal of biological chemistry |
High |
20427281
|
| 2011 |
IDOL requires both its FERM and RING domains for LDLR degradation. The RING domain promotes ubiquitination in vitro and K63-specific ubiquitination of LDLR in vivo. The FERM domain interacts with LDLR and co-localizes with it at the plasma membrane. A phosphotyrosine-binding element in the FERM domain and residues in the LDLR preceding the NPVY motif are required for LDLR degradation. |
In vitro ubiquitination assay, domain mutagenesis, homology modeling, co-localization imaging, cell-based LDLR degradation assay |
The Journal of biological chemistry |
High |
21734303
|
| 2011 |
The UBE2D family (UBE2D1-4) are the cognate E2 ubiquitin-conjugating enzymes for IDOL, supporting both IDOL autoubiquitination and IDOL-dependent ubiquitination of LDLR in a cell-free reconstitution system. Crystal structure of the IDOL RING domain–UBE2D1 complex at 2.1 Å revealed key interactions for E2 selectivity. Structure-based mutations that inhibit IDOL dimerization or IDOL–UBE2D interaction block LDLR ubiquitination and degradation; dominant-negative UBE2D inhibits IDOL-mediated LDLR degradation in cells. |
Cell-free reconstitution ubiquitination assay, 2.1 Å crystal structure, NMR chemical shift mapping, structure-based mutagenesis, dominant-negative expression in cells |
Genes & development |
High |
21685362
|
| 2011 |
Idol-null cells show markedly elevated LDLR protein and increased LDL uptake. Oxysterols and lipoprotein-containing serum fail to suppress LDLR levels in Idol-null cells. LXR ligands have no effect on LDLR levels in Idol-null cells, demonstrating that Idol is required for LXR-dependent inhibition of the LDLR pathway. The LDLR half-life is prolonged in the absence of Idol. PCSK9- and statin-mediated regulation of LDLR is independent of and additive with the LXR-Idol pathway. |
Gene-targeted Idol-null mouse embryonic stem cells, LDL uptake assay, cycloheximide chase (LDLR half-life), pharmacological treatment with oxysterols, LXR agonists, statins, PCSK9 |
Molecular and cellular biology |
High |
21343340
|
| 2011 |
The N342S amino acid substitution (rs9370867) in MYLIP is associated with increased LDLR degradation and decreased LDL uptake. Mutagenesis of residue 342 does not affect intrinsic MYLIP E3 ligase activity but is critical for LDLR targeting. |
Functional mutagenesis, LDL uptake assay, LDLR degradation assay in cells |
The Journal of clinical investigation |
Medium |
21765216
|
| 2012 |
FGF21 reduces MYLIP/Idol at the RNA and protein level and increases LDLR levels and stability. FGF21 also upregulates Canopy2 (Cnpy2/Msap), which interacts with MYLIP/Idol. Overexpression of Cnpy2/Msap increases LDLR levels; knockdown of Cnpy2/Msap abrogates the FGF21 effect on LDLR. |
siRNA knockdown, overexpression, DiI-LDL uptake assay, Western blotting in human hepatocyte cells and mouse macrophages |
The Journal of biological chemistry |
Medium |
22378787
|
| 2013 |
IDOL stimulates a clathrin-independent, caveolae-independent pathway for LDLR internalization. IDOL is recruited to the plasma membrane by LDLR, promotes LDLR internalization, and shuttles LDLR into the multivesicular body (MVB) pathway via ESCRT complexes (ESCRT-0/HGS and ESCRT-I/TSG101). Knockdown of HGS or TSG101 prevents IDOL-mediated LDLR degradation. USP8 acts downstream of IDOL to deubiquitinate LDLR and is required for LDLR entry into the MVB pathway. |
Real-time single-particle tracking, electron microscopy, siRNA knockdown of ESCRT components and USP8, live-cell imaging |
Molecular and cellular biology |
High |
23382078
|
| 2013 |
The LXR-IDOL axis targets an LDLR pool present in lipid rafts for internalization independent of clathrin, caveolin, macroautophagy, and dynamin, but dependent on the endocytic protein epsin. LDLR ubiquitylation by IDOL acts as a sorting signal; degradation can be blocked by perturbing ESCRT or by USP8. |
Pharmacological and genetic inhibition of endocytic pathways, functional LDL uptake assay, lipid raft fractionation |
Journal of lipid research |
High |
23733886
|
| 2013 |
Reelin decreases VLDLR levels in hippocampal neurons through an increase in MYLIP/Idol levels; shRNA-mediated knockdown of Mylip/Idol abrogates the Reelin-induced decrease in VLDLRs. BDNF increases VLDLR levels by increasing gene expression, acting through a distinct transcriptional mechanism. |
shRNA knockdown of Mylip/Idol in hippocampal neurons, Western blotting, pharmacological treatment with BDNF and Reelin |
The Journal of biological chemistry |
Medium |
23990472
|
| 2014 |
In cynomolgus monkeys but not mice, LXR activation induces hepatic IDOL expression, reduces LDLR protein levels, and raises plasma LDL levels. Antisense oligonucleotide knockdown of IDOL in monkeys blunts the effect of LXR agonist on LDL levels, establishing a species- and tissue-specific function of the LXR-IDOL axis in primate lipoprotein metabolism. |
LXR agonist treatment in cynomolgus monkeys, antisense oligonucleotide (ASO) knockdown, plasma LDL measurement, liver LDLR protein analysis |
Cell metabolism |
High |
25440061
|
| 2014 |
Hepatic IDOL overexpression increases plasma PCSK9 levels through two mechanisms: LDLR loss activates SREBP2, which transcriptionally upregulates PCSK9; and reduced hepatic LDLR delays clearance of circulating PCSK9. |
Adenoviral overexpression of Idol in mouse and hamster liver, LDLR-deficient mice as control, 125I-labeled PCSK9 kinetic study, SREBP2 activation assays |
Arteriosclerosis, thrombosis, and vascular biology |
High |
24675665
|
| 2015 |
USP2 (both isoforms USP2-69 and USP2-45) interacts with IDOL and promotes its deubiquitylation in a USP2 enzymatic activity-dependent manner, markedly stabilizing IDOL protein. Paradoxically, USP2 also forms a tripartite complex with IDOL and LDLR, promotes LDLR deubiquitylation in this context, and thereby prevents LDLR degradation. Loss of USP2 reduces LDLR protein in an IDOL-dependent manner. |
Genetic screening, reciprocal Co-immunoprecipitation, USP2 catalytic mutants, siRNA knockdown, LDL uptake assay |
Circulation research |
High |
26666640
|
| 2015 |
DUB inhibition induces LXR-independent transcriptional upregulation of IDOL, driving lysosomal LDLR degradation. A 70-bp region in the IDOL proximal promoter, distinct from the LXR-responsive element, mediates this response. This identifies a sterol-independent mechanism to regulate IDOL expression. |
Pharmacological DUB inhibition, Lxrαβ−/− MEFs, reporter assay with IDOL promoter deletion constructs |
The Journal of biological chemistry |
Medium |
26719329
|
| 2015 |
MARCH6 is an endogenous inhibitor of the SREBP transcriptional program; loss of MARCH6 unexpectedly decreases cellular lipoprotein uptake despite upregulating LDLR mRNA, because it induces IDOL expression leading to lysosomal LDLR degradation. IDOL induction is the molecular mechanism by which MARCH6 uncouples cholesterol synthesis from lipoprotein uptake in hepatocytes. |
Genetic knockdown of MARCH6, IDOL expression analysis, LDL uptake assay, SREBP target gene expression |
Molecular and cellular biology |
Medium |
26527619
|
| 2015 |
IDOL is a primary physiological regulator of LDLR protein in the brain (unlike in mouse liver where its contribution is minimal). Idol deficiency increases brain LDLR, decreases ApoE, decreases soluble and insoluble Aβ, reduces amyloid plaque burden, and ameliorates neuroinflammation in a transgenic Aβ amyloidosis mouse model. |
Idol-deficient mice crossed with APP/PS1 amyloidosis model, brain LDLR/ApoE/Aβ quantification, plaque burden histology, neuroinflammation markers |
Science translational medicine |
High |
26582899
|
| 2017 |
IDOL determines synaptic ApoER2 protein levels in response to neuronal activation and regulates dendritic spine morphogenesis and plasticity. Loss of IDOL causes constitutive ApoER2 overexpression, impairs activity-dependent structural remodeling of spines, and causes defective LTP in hippocampal slices. IDOL-deficient mice show impaired experience-dependent cortical circuit reorganization and diminished spatial and associative learning. |
Neuronal IDOL loss-of-function (genetic KO), electrophysiology (LTP in hippocampal slices), dendritic spine morphology imaging, barrel cortex plasticity assay, behavioral tests |
eLife |
High |
28891791
|
| 2018 |
CNPY2 inhibits MYLIP-mediated ubiquitination and proteasomal degradation of androgen receptor (AR) in prostate cancer cells by blocking the interaction between MYLIP and its E2 partner UBE2D1. This identifies AR as a substrate of MYLIP E3 ligase activity. |
Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, AR overexpression rescue, in vitro interaction assay between CNPY2-MYLIP-UBE2D1 |
Oncotarget |
Medium |
29707137
|
| 2018 |
IDOL homodimerization is required for its E3 ligase activity. A cyclic peptide (cyclo-CFFLYT) that disrupts IDOL homodimerization inhibits IDOL activity and produces a dose-dependent increase in LDLR levels in hepatic cells. |
SICLOPPS cyclic peptide library screen (3.2 million peptides), cell-based LDLR abundance assay, non-natural amino acid optimization |
Chemical science |
Medium |
30079210
|
| 2019 |
The IDOL G51S variant (rs149696224) stabilizes IDOL protein by inhibiting its dimerization and preventing self-ubiquitination and subsequent proteasomal degradation. IDOL G51S exhibits stronger ability to promote LDLR ubiquitination and degradation. AAV-mediated liver expression of IDOL G51S in mice decreases hepatic LDLR and increases serum LDL-C levels. |
Whole-exome sequencing, mutagenesis, dimerization assay, self-ubiquitination assay, LDLR ubiquitination assay, AAV liver expression in mice |
Arteriosclerosis, thrombosis, and vascular biology |
High |
31597442
|
| 2019 |
Loss of IDOL in mice protects against diet-induced obesity not through peripheral metabolic tissues but specifically through controlling lipoprotein receptor abundance in neurons. VLDLR, rather than LDLR, is identified as the primary mediator of IDOL effects on energy balance. IDOL deletion alters hypothalamic gene expression linked to metabolic control, as revealed by single-cell RNA sequencing. |
Tissue-specific conditional knockout mice (liver, adipose, endothelium, intestine, skeletal muscle, neuron-specific), single-cell RNA sequencing of hypothalamus, metabolic phenotyping |
Nature metabolism |
High |
32072135
|
| 2020 |
IDOL can be modified by SUMO-1 at lysine 293, a residue also used for autoubiquitination. SUMOylation of IDOL counteracts its ubiquitination and augments IDOL protein levels. SENP1 (a SUMO-specific peptidase) reverses IDOL SUMOylation in an activity-dependent manner, decreasing IDOL levels, increasing LDLR, and enhancing LDL uptake. Loss of SENP1 lowers LDLR in an IDOL-dependent manner. |
SUMOylation assay, ubiquitination assay, mutagenesis at K293, SENP1 overexpression and knockdown, LDL uptake assay |
The Journal of biological chemistry |
High |
33154164
|
| 2020 |
IDOL-mediated LDLR ubiquitination and degradation is active in intestinal enterocytes. LXR activation in intestinal cell lines decreases LDLR protein abundance, cell surface occupancy, and LDL uptake in an IDOL-dependent manner. Primary enterocytes from Idol-null mice have elevated LDLR. LXR agonist treatment of mice increases Idol expression throughout the intestine with concurrent reduction in LDLR protein. |
Idol-KO mouse primary enterocytes, LXR agonist treatment in mice, cell surface LDLR measurement, LDL uptake assay |
Atherosclerosis |
Medium |
33190106
|
| 2020 |
Crystal structures of the extended FERM domain of IDOL reveal the archetypal F1-F2-F3 trilobed FERM domain structure in which the F3c subdomain orientation obscures the target (LDLR)-binding site. SAXS analysis indicates a compact globular core FERM domain with a flexible, extended C-terminal region, suggesting IDOL may require activation for substrate recognition. |
Crystal structure determination of IDOL FERM domain and F3ab subdomain (multiple conformations), small-angle X-ray scattering (SAXS), in vitro ubiquitination assay |
The Journal of biological chemistry |
High |
32727844
|
| 2023 |
IDOL (the cellular LXR-induced E3 ligase) targets the HCMV UL136p33 protein for proteasomal turnover. IDOL is highly expressed in undifferentiated hematopoietic cells (where HCMV establishes latency) and sharply downregulated upon differentiation. IDOL knockdown affects viral gene expression in wild-type HCMV infection; LXR agonist restricts HCMV reactivation in a UL136p33-dependent manner, establishing IDOL as a host regulator of viral latency. |
IDOL knockdown (siRNA), LXR agonist treatment, ubiquitination assay for UL136p33, recombinant stabilized UL136p33 mutant virus, viral gene expression analysis |
Journal of virology |
Medium |
37338407
|
| 2025 |
MYLIP interacts with HIF-1α and HIF-2α and catalyzes K27-linked polyubiquitination of HIF-1α at K118/K442 and HIF-2α at K117, inducing their proteasomal degradation and attenuating hypoxia signaling. Mylip-deficient zebrafish, bluntsnout bream, and mice show increased hypoxia tolerance. |
Co-immunoprecipitation, site-specific K27 ubiquitin linkage assays, K-to-R mutagenesis of HIF-1α/2α, Mylip-KO animals (zebrafish, fish, mouse), hypoxia survival assays |
Communications biology |
High |
40399570
|
| 2024 |
MYLIP ubiquitinates and degrades NKRF (a transcriptional repressor) via the proteasomal pathway. MYLIP-mediated NKRF degradation relieves transcriptional repression of SLC25A34 in colorectal cancer cells, suppressing xenograft formation and lung metastases. |
Co-immunoprecipitation, ubiquitination assay, protein stability assay, MYLIP overexpression in CRC cells, in vivo xenograft and metastasis models |
Digestive diseases and sciences |
Medium |
39661280
|