| 2010 |
UBIAD1 (human homologue of E. coli prenyltransferase menA) is a menaquinone-4 (MK-4) biosynthetic enzyme: siRNA knockdown inhibited conversion of deuterium-labelled vitamin K derivatives to MK-4-d7 in human cells, and baculovirus-expressed UBIAD1 in insect cells catalyzed this conversion; the product was confirmed by 2H-NMR. UBIAD1 was localized to the endoplasmic reticulum. |
siRNA knockdown in human cells, baculovirus expression in Sf9 insect cells, isotope-labelled substrate conversion assay, 2H-NMR chemical identification, immunofluorescence localization |
Nature |
High |
20953171
|
| 2013 |
Human UBIAD1 is a non-mitochondrial prenyltransferase that synthesizes CoQ10 in the Golgi membrane compartment. Loss of UBIAD1 (zebrafish barolo null mutant) reduces the cytosolic pool of CoQ10, causing ROS-mediated lipid peroxidation in vascular cells and cardiovascular failure. Inhibition of eNOS prevents Ubiad1-dependent cardiovascular oxidative damage, placing UBIAD1-derived CoQ10 upstream of eNOS/NO signaling. |
Zebrafish null mutant (barolo), CoQ10 measurement, ROS/lipid peroxidation assays, eNOS inhibitor epistasis, human UBIAD1 CoQ10 synthesis assay in cells |
Cell |
High |
23374346
|
| 2007 |
Missense mutations in UBIAD1 (encoding a predicted prenyltransferase) are causal for Schnyder crystalline corneal dystrophy (SCCD). Five disease-segregating mutations were identified; UBIAD1 was reported to interact physically with apolipoprotein E. |
Fine mapping, Sanger sequencing in SCCD families, co-segregation analysis, bacterial two-hybrid/interaction assay (ApoE binding reported from prior work cited) |
PloS one |
Medium |
17668063
|
| 2007 |
Nonsynonymous mutations in UBIAD1 (N102S and G177R) cause SCCD; predicted structural modelling indicated mutations affect a prenyl-transferase domain and transmembrane helices important for catalytic function. |
PCR-based DNA sequencing of six SCCD families, co-segregation analysis, protein structure prediction |
Investigative ophthalmology & visual science |
Medium |
17962451
|
| 2014 |
Crystal structures of the UBIAD1 archaeal homologue AfUbiA (solved in unliganded form and bound to Mg2+ and two different isoprenyl diphosphates) revealed a Mg2+-dependent prenyl transfer mechanism. Functional assays on E. coli MenA confirmed the importance of residues involved in Mg2+ and substrate binding. Disease-causing UBIAD1 mutations cluster around the active site in AfUbiA, indicating conserved catalytic mechanism. |
X-ray crystallography (AfUbiA structures), site-directed mutagenesis of MenA, in vitro enzyme activity assays |
PLoS biology |
High |
25051182
|
| 2015 |
Sterols stimulate binding of UBIAD1 to ER-localized HMG CoA reductase, inhibiting its sterol-accelerated ERAD. Geranylgeraniol (GGOH, convertible to GGpp) inhibits UBIAD1–reductase binding, allowing reductase degradation and promoting UBIAD1 transport from ER to Golgi. CRISPR-Cas9 knockout of UBIAD1 relieved the GGOH requirement for reductase degradation. SCD-associated UBIAD1 mutations block GGpp-induced displacement from reductase, preventing its degradation and identifying UBIAD1 as the target of geranylgeraniol in reductase ERAD regulation. |
Co-immunoprecipitation, CRISPR-Cas9 knockout, pulse-chase ERAD assay, GGOH addition/depletion, SCD mutant panel |
eLife |
High |
25742604
|
| 2015 |
Enzymological characterization of UBIAD1 in microsomal fractions: optimal activity at pH 8.5–9.0 with DTT; geranyl pyrophosphate and farnesyl pyrophosphate are accepted as side-chain substrates; lipophilic statins directly inhibit UBIAD1 enzymatic activity. Four conserved domains are essential for activity: domain I is a substrate recognition site, domain II contains a redox CxxC motif, domain III is a catalytic hinge region, and domain IV is a Mg2+/isoprenyl side-chain binding site — established by mutagenesis of each domain. |
In vitro MK-4 biosynthesis assay using microsomal fractions from Sf9 cells, site-directed mutagenesis of conserved domains and individual residues, statin inhibition assay |
PloS one |
High |
25874989
|
| 2012 |
UBIAD1 physically interacts with HMGCR (HMG CoA reductase) and SOAT1 (acyl-CoA:cholesterol acyltransferase), demonstrated by yeast two-hybrid screening and co-immunoprecipitation. SCD-associated UBIAD1 mutations reduce MK-4 synthesis and alter binding to these cholesterol metabolic enzymes. Molecular docking suggested cholesterol binds in the UBIAD1 substrate-binding cleft, overlapping with GGPP binding. |
Yeast two-hybrid, co-immunoprecipitation, MK-4 synthesis assay in SCD mutants, molecular docking simulation |
Human mutation |
Medium |
23169578
|
| 2013 |
UBIAD1 is localized to the Golgi and ER (not plasma membrane) in multiple human cell lines. The N-terminal RPWS motif (Arginine finger) serves as a Golgi retention signal identified by site-directed mutagenesis. UBIAD1 is transported from ER to Golgi via a COPII-mediated mechanism (shown by brefeldin A and cycloheximide assays). Mutation of the RPWS motif reduces UBIAD1-induced apoptosis in T24 bladder cancer cells, linking Golgi localization to tumor-suppressor activity. |
Fluorescence microscopy, immunohistochemistry, subcellular fractionation/western blot, site-directed mutagenesis of RPWS motif, brefeldin A and cycloheximide inhibition assays, flow cytometry apoptosis assay |
PloS one |
Medium |
23977195
|
| 2016 |
UBIAD1 continuously cycles between the ER and medial-trans Golgi in isoprenoid-replete cells. When intracellular GGpp declines, UBIAD1 becomes trapped in the ER where it inhibits HMGCR ERAD. SCD-associated mutants are constitutively sequestered in the ER and block reductase degradation. Overexpression of PDP1 (Type 1 polyisoprenoid diphosphate phosphatase), which dephosphorylates GGpp, abolishes GGOH-induced ERAD of reductase and Golgi transport of UBIAD1; conversely, PDP1 deletion enhances these reactions. |
Subcellular fractionation, immunofluorescence, ERAD pulse-chase assay, GGOH treatment, SCD mutant analysis |
Journal of lipid research |
High |
27121042 34842525
|
| 2019 |
SCD-associated UBIAD1 mutants reside mainly in the ER and compete with Insig-1 for HMGCR binding, thereby preventing HMGCR ERAD and increasing cholesterol biosynthesis. HMGCR was identified as a UBIAD1 binding partner by mass spectrometry. Heterozygous Ubiad1 G184R knock-in mice accumulate elevated HMGCR protein in tissues, and aged knock-in mice exhibit corneal opacification and free cholesterol accumulation, phenocopying SCD. |
Mass spectrometry co-IP, co-immunoprecipitation, HMGCR ERAD assay, Ubiad1 G184R knock-in mouse model, corneal histology and cholesterol measurement |
PLoS genetics |
High |
31323021
|
| 2019 |
Knockin mice expressing SCD-associated UBIAD1 accumulate HMGCR protein across multiple tissues due to ER sequestration of mutant UBIAD1 and inhibition of HMGCR ERAD. Aged knockin mouse corneas show opacification and sterol overaccumulation, establishing the physiological significance of UBIAD1-regulated HMGCR ERAD in cholesterol homeostasis and SCD pathogenesis. |
UBIAD1 SCD knock-in mouse model, HMGCR protein quantification across tissues, ERAD assay, corneal lipid analysis, histology |
eLife |
High |
30785396
|
| 2020 |
Embryonic lethality of Ubiad1 homozygous knockout in mice results from enhanced ERAD of HMGCR (depleting mevalonate-derived products), not from reduced MK-4 synthesis: homozygous Ubiad1 deletion is rescued in knockin mice expressing ubiquitination/ERAD-resistant HMGCR, providing genetic epistasis evidence for UBIAD1 as a physiological regulator of HMGCR ERAD. |
Genetic epistasis — Ubiad1 KO crossed with ERAD-resistant HMGCR knockin mice, embryonic lethal rescue experiment |
eLife |
High |
32118581
|
| 2020 |
SCD-associated UBIAD1 exhibits reduced MK-4 synthetic activity in isolated membranes and intact cells (biochemical assay developed in this study), likely due to reduced affinity for GGpp. ER sequestration of SCD-associated UBIAD1 protects it from autophagy-mediated degradation, allowing intracellular accumulation that amplifies inhibition of HMGCR ERAD. |
Cell-free membrane MK-4 synthesis assay, intact-cell MK-4 assay, autophagy inhibitor treatment, SCD mutant panel analysis |
Journal of lipid research |
High |
32188638
|
| 2013 |
UBIAD1-mediated vitamin K2 synthesis is required cell-autonomously for endothelial cell survival and vascular homeostasis in zebrafish: the reddish/reh ubiad1 mutant exhibits cardiac edema, cranial hemorrhages and vascular degeneration due to endothelial cell survival defects. Vascular (but not cardiac) phenotype was rescued by zebrafish or human UBIAD1 or by exogenous vitamin K2; warfarin-treated zebrafish phenocopy the vascular defect, suggesting an alternative UBIAD1/vitamin K-independent pathway regulates cardiac function. |
Zebrafish forward genetic screen, transgenic rescue with zebrafish and human UBIAD1, vitamin K2 supplementation rescue, warfarin pharmacological phenocopy |
Development (Cambridge, England) |
High |
23533172
|
| 2014 |
Ubiad1-deficient mouse embryos die by E7.5 with gastrulation arrest. Ubiad1−/− ES cells cannot synthesize vitamin K2 but retain CoQ9 synthesis at wild-type levels, indicating UBIAD1 is responsible for MK-4 but not CoQ9 synthesis in mice. Embryonic lethality was partially extended by maternal MK-4 or CoQ10 supplementation. |
Gene targeting/knockout in mice, ES cell vitamin K2 and CoQ9 synthesis assays, maternal supplementation rescue |
PloS one |
High |
25127365
|
| 2011 |
TERE1/UBIAD1 and the interacting protein TBL2 inversely modulate cellular cholesterol levels (20–50% change) in HEK293 and bladder cancer cells. TERE1 point mutations associated with SCCD affect ApoE binding and result in cholesterol levels distinct from wild-type. Ectopic TERE1 expression in J82 bladder cancer cells dramatically inhibits nude mouse tumorigenesis. |
Ectopic expression and siRNA knockdown of TERE1/TBL2, Amplex Red cholesterol assay, GST-ApoE binding assay, molecular modeling, nude mouse xenograft tumorigenicity assay |
DNA and cell biology |
Medium |
21740188
|
| 2005 |
TERE1/UBIAD1 physically interacts with the C-terminal domain (from aa 124) of apolipoprotein E (ApoE), confirmed by bacterial two-hybrid screening, ProBond affinity chromatography with 6xHis-tagged recombinant proteins, and 35S-labelled protein binding. |
Bacterial two-hybrid screening, ProBond affinity chromatography, 35S-Met/Cys labelled protein binding assay |
Journal of cellular biochemistry |
Medium |
15782423
|
| 2013 |
TERE1/UBIAD1 directly interacts with the mitochondrial WD40-repeat protein TBL2 with high affinity (demonstrated by biochemical binding assays). SCD-associated single amino acid substitutions in TERE1 reduce TBL2 binding. Ectopic TERE1 expression elevates mitochondrial trans-membrane potential, oxidative stress, NO production, and activates SXR nuclear hormone receptor target genes. |
Biochemical binding assays (direct high-affinity interaction), immunoprecipitation, mitochondrial membrane potential measurement, ROS/NO assays, RT-PCR of SXR target genes, subcellular fractionation |
Journal of cellular biochemistry |
Medium |
23564352
|
| 2018 |
UBIAD1 interacts with the C-terminal domain of H-Ras, retains H-Ras in the Golgi apparatus, and prevents its trafficking from Golgi to the plasma membrane, thereby blocking aberrant Ras/MAPK signaling and inhibiting bladder cancer cell proliferation. GGpp is required for UBIAD1 to maintain this function. Drosophila HEIX (UBIAD1 ortholog) in vivo model confirmed that Ras/ERK activation at the plasma membrane (by UBIAD1 loss) induced melanotic masses. |
Co-immunoprecipitation, subcellular fractionation, live-cell imaging of H-Ras trafficking, Ras/ERK signaling assays, GGpp supplementation/depletion, Drosophila in vivo model |
Cell death & disease |
Medium |
30518913
|
| 2015 |
The transcription factor YY1 positively regulates UBIAD1 expression by binding to a YY1 consensus motif in the UBIAD1 promoter; demonstrated by deletion/mutation analysis of the promoter, EMSA, and chromatin immunoprecipitation. YY1 siRNA knockdown decreased endogenous UBIAD1 mRNA and MK-4 conversion activity. |
Promoter deletion/mutation analysis, EMSA (electrophoretic mobility shift assay), chromatin immunoprecipitation (ChIP), siRNA knockdown, MK-4 conversion activity assay |
Biochemical and biophysical research communications |
Medium |
25772619
|
| 2021 |
Type 1 polyisoprenoid diphosphate phosphatase (PDP1) dephosphorylates GGpp to GGOH, thereby modulating the intracellular GGpp pool. PDP1 overexpression abolishes protein geranylgeranylation, GGOH-induced ERAD of HMGCR, and Golgi transport of UBIAD1; PDP1 deletion enhances these reactions, establishing PDP1 as an upstream regulator of the GGpp-sensing mechanism that controls UBIAD1 trafficking. |
PDP1 overexpression and knockout cells, protein geranylgeranylation assay, HMGCR ERAD pulse-chase, UBIAD1 Golgi localization by immunofluorescence |
eLife |
High |
34842525
|
| 2021 |
Cell-based assays showed that UBIAD1 SCD mutations differentially affect MK-4 biosynthesis and vitamin K-dependent (VKD) carboxylation: hotspot N102S retains ~82% MK-4 activity and does not affect VKD carboxylation, while G186R significantly impairs both. CRISPR-Cas9 knockout of endogenous Ubiad1 in reporter cells established the assay system. |
CRISPR-Cas9 Ubiad1 KO reporter cells, MK-4 production assay, VKD carboxylation efficiency assay, SCD mutant panel |
The FEBS journal |
Medium |
34813684
|
| 2025 |
Chemical genetic screening identified the tyrosine kinase inhibitor Apatinib as a molecule that restores Golgi localization of SCD-associated UBIAD1 (N102S) and thereby relieves inhibition of HMGCR ERAD. This effect requires GGpp but is independent of Apatinib's tyrosine kinase inhibition. Photoaffinity labeling studies showed Apatinib binds directly to UBIAD1, indicating allosteric activation of GGpp-induced ER-to-Golgi transport. |
Chemical genetic screen, immunofluorescence of UBIAD1 localization, HMGCR ERAD assay, photoaffinity labeling, GGpp requirement testing, kinase inhibition control |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
40372435
|
| 2019 |
Tamoxifen-inducible systemic UBIAD1 knockout in adult mice causes death within ~60 days, with the pancreas showing the most prominent pathology: pancreatic acinar cells disappear and are replaced by adipocytes. UBIAD1 deficiency in acinar cells increases oxidative stress and autophagy, leading to apoptotic cell death. |
Tamoxifen-inducible systemic UBIAD1 knockout mouse, histology, oxidative stress assays, autophagy markers, apoptosis assays |
International journal of molecular sciences |
Medium |
31013667
|
| 2010 |
In SCD patient-derived keratocytes and lymphoblastoid cell lines, both wild-type and N102S UBIAD1 protein localize to mitochondria (by immunohistochemistry with UBIAD1-specific antibody); no significant alteration of cholesterol metabolite ratios was observed in patient versus control cell extracts. |
Immunohistochemistry in patient-derived keratocytes and lymphoblastoid cell lines, cholesterol metabolite analysis |
PloS one |
Low |
20505825
|
| 2024 |
UBIAD1 and CoQ10 increase plasma membrane fluidity and cell stiffness in breast cancer cells. Loss of UBIAD1 impairs ECM-mediated oncogenic signaling and reduces ferroptosis resistance. In vivo, UBIAD1 expression in breast cancer limits circulating tumor cell survival and lung metastasis formation. |
Atomic force microscopy (cell stiffness), membrane fluidity assay, ferroptosis assay, ECM signaling assays, mouse xenograft/metastasis model, patient data correlation |
Nature communications |
Medium |
39294175
|
| 2022 |
UBIAD1 and plasma membrane CoQ10 sustain melanoma cell survival and proliferation by preventing lipid peroxidation. NQO1 (NAD(P)H Quinone Dehydrogenase 1), which reduces CoQ10 on plasma membranes, acts downstream of UBIAD1 to support melanoma cell survival. |
UBIAD1 knockdown/overexpression in melanoma cells, CoQ10 measurement, lipid peroxidation assay, NQO1 epistasis experiment, cell viability assay |
Redox biology |
Medium |
35255427
|