| 2006 |
UCH-L1 deubiquitinating activity is required for normal synaptic and cognitive function; restoration of UCH-L1 enzymatic activity (via TAT-UCH-L1 fusion protein) rescues beta-amyloid-induced decreases in synaptic function and restores normal levels of PKA-regulatory subunit IIalpha, PKA activity, and CREB phosphorylation in hippocampal slices and APP/PS1 mice. |
TAT-fusion protein transduction into hippocampal slices and APP/PS1 mice; enzymatic activity assays; biochemical measurement of PKA-RIIalpha, PKA activity, and CREB phosphorylation; contextual fear conditioning |
Cell |
High |
16923396
|
| 2002 |
UCH-L1 (PGP9.5) interacts with JAB1 (a Jun activation domain-binding protein involved in p27Kip1 degradation) in vitro and in vivo, and both proteins form a heteromeric complex with p27Kip1 in the nucleus of lung cancer cells; nuclear translocation of UCH-L1 and JAB1 coincides with reduced nuclear p27Kip1 levels, suggesting UCH-L1 contributes to p27Kip1 degradation via JAB1. |
Yeast two-hybrid screen; co-immunoprecipitation in vitro and in vivo; colocalization studies; serum restimulation and contact inhibition experiments |
Oncogene |
Medium |
12082530
|
| 2013 |
UCH-L1 regulates the balance between mTORC1 and mTORC2 by disrupting the DDB1-CUL4 ubiquitin ligase complex interaction with raptor and counteracting DDB1-CUL4-mediated raptor ubiquitination, leading to mTORC1 dissolution and secondary increase in mTORC2 activity (increased Akt phosphorylation, decreased S6K and 4EBP1 phosphorylation). |
Co-immunoprecipitation; ubiquitination assays; mTOR complex assembly analysis; UCHL1-deficient and transgenic mouse models; kinase activity assays for S6K, 4EBP1, and Akt |
Molecular and cellular biology |
High |
23297343
|
| 2008 |
Familial PD-associated I93M mutant UCH-L1 and carbonyl-modified (oxidatively damaged) UCH-L1 share aberrant properties: increased insolubility, elevated interactions with multiple proteins including tubulin, and similar structural changes by circular dichroism; aberrant interaction of mutant or carbonyl-modified UCH-L1 with tubulin modulates tubulin polymerization. |
Circular dichroism analysis; solubility fractionation; co-immunoprecipitation/pulldown with tubulin; in vitro tubulin polymerization assay; transgenic mice |
Human molecular genetics |
Medium |
18250096
|
| 2018 |
UCH-L1 associates with and promotes assembly of the translation initiation complex eIF4F and stimulates protein synthesis through a mechanism requiring its catalytic (deubiquitinase) activity; this bypasses mTORC1-dependent protein synthesis and is required for MYC-driven lymphomagenesis in Eμ-myc mice. |
Proximity-based proteomics (BioID); co-immunoprecipitation; protein synthesis assays; catalytic mutant UCH-L1 transgenic mice; Eμ-myc lymphoma model |
Blood |
High |
30257881
|
| 2006 |
UCH-L1 displays distinct substrate recognition from its homologue UCH-L3; specific ubiquitin side chains critical for forming the Michaelis complex and enabling catalysis by UCH-L1 were identified using a panel of ubiquitin fusions; activation parameters show mechanistic differences in substrate specificity between UCH-L1 and UCH-L3. |
In vitro enzymatic assays with ubiquitin fusion panel; kinetic analysis; activation parameter measurements |
Biochemistry |
High |
17144664
|
| 2022 |
Crystal structure of UCHL1 in complex with inhibitor GK13S reveals the enzyme locked in a hybrid conformation between apo and ubiquitin-bound states; stereoselective inhibition of cellular UCHL1 by GK13S reduces monoubiquitin levels in glioblastoma cells, phenocopying an inactivating mouse mutation of UCHL1. |
X-ray crystallography; biochemical characterization of activity-based probes; cellular monoubiquitin measurement; activity-based probe labeling |
Nature communications |
High |
36216817
|
| 2017 |
UCH-L1 directly deubiquitinates TrkB (the BDNF receptor) at lysine K460 in the juxtamembrane domain; UCH-L1-regulated TrkB deubiquitination prevents BDNF-induced TrkB internalization and lysosomal degradation, sustaining surface TrkB levels, TrkB activation, and downstream signaling; blocking UCH-L1–TrkB interaction in vivo impairs hippocampus-dependent memory. |
Co-immunoprecipitation; in vitro deubiquitination assay; ubiquitination site mapping (K460); competitive inhibitory peptide; in vivo hippocampal injection and fear conditioning |
The Journal of neuroscience |
High |
28500221
|
| 2020 |
UCHL1 binds, deubiquitinates, and stabilizes EGFR (epidermal growth factor receptor), thereby activating downstream EGFR mediators and driving pathological cardiac hypertrophy; knockdown of UCHL1 ameliorates hypertrophy while overexpression exacerbates it. |
Co-immunoprecipitation; ubiquitination assay; UCHL1 knockdown and overexpression in cardiomyocytes; rAAV9-UCHL1 mouse model; pressure overload model; pharmacological inhibition with LDN-57444 |
Science advances |
High |
32494592
|
| 2020 |
UCHL1 deubiquitinates and stabilizes EGFR, which suppresses ERα transcription, thereby downregulating estrogen receptor alpha expression in breast cancer; UCH-L1 inhibition restores ERα expression and sensitizes ER-negative breast cancer to tamoxifen and fulvestrant in vivo and in vitro. |
Immunoprecipitation; ubiquitination assay; luciferase reporter; ChIP assay; qRT-PCR; immunoblotting; in vivo xenograft model |
Theranostics |
Medium |
32042339
|
| 2013 |
UCH-L1 protects from TNF-induced necroptosis; HtrA2/Omi serine protease induces monoubiquitination of UCH-L1 (indicative of activation) during necroptosis rather than cleaving it; pharmacological or RNAi-mediated inhibition of UCH-L1 protects cells from TNF-induced necroptosis; UCH-L1 is a mediator of caspase-independent cell death in kidney podocytes. |
Pharmacological inhibition; RNA interference; cell death assays; monoubiquitination detection; PARP-1 cleavage; caspase activity assays; morphological analysis |
Cell communication and signaling : CCS |
Medium |
24090154
|
| 2019 |
UCHL1 promotes podocyte necroptosis by maintaining deubiquitinated (stabilized) RIPK1 and RIPK3; UCHL1 knockdown reduces half-life and expression of RIPK1 and RIPK3, decreasing MLKL activation and protecting podocytes from high-glucose-induced necroptosis. |
UCHL1 siRNA knockdown; protein half-life assay; Western blot for RIPK1, RIPK3, MLKL, caspase-3; cell death assays; scanning electron microscopy; in vivo diabetic nephropathy model |
Experimental cell research |
Medium |
31247189
|
| 2019 |
Binding of ischemia-induced reactive lipid species to cysteine C152 of UCHL1 inactivates the enzyme; a C152A knock-in mouse resistant to lipid adduction showed decreased axonal injury, reduced tissue loss, preserved excitatory synaptic drive and axonal conduction velocity, and improved sensorimotor recovery after MCAO, demonstrating that C152 is a key site for post-translational inactivation of UCHL1 by reactive lipids after stroke. |
C152A knock-in mouse; middle cerebral artery occlusion (MCAO); histological analysis; electrophysiology; behavioral assessment; polyubiquitinated protein detection |
Proceedings of the National Academy of Sciences of the United States of America |
High |
30760601
|
| 2020 |
UCHL1 deubiquitinates and stabilizes pyruvate kinase (PKM), promoting glycolysis; loss of UCHL1 destabilizes PKM, reduces pyruvate and ATP levels, activates AMPK, and promotes AMPK-dependent mitophagy via ULK1 and FUNDC1, mitigating PD-related phenotypes caused by PINK1/Parkin loss-of-function. TRIM63 is identified as the E3 ligase for PKM, antagonizing UCHL1. |
UCHL1 knockout cells and Drosophila models; PKM stability assay; ATP/pyruvate measurements; AMPK activity assay; mitophagy assays; co-immunoprecipitation; E3 ligase identification |
Science advances |
High |
34244144
|
| 2017 |
UCH-L1 interacts with and promotes K63-linked ubiquitin chain formation on tau, and its inhibition reduces K63-linked ubiquitin chains, decreases HDAC6 deacetylase activity, attenuates HDAC6–tau interaction, and impairs proteasomal impairment-induced tau aggresome formation. |
UCH-L1 inhibitor (LDN); UCH-L1 siRNA; immunoprecipitation; ubiquitin chain-linkage analysis; HDAC6 activity assay; tau aggresome immunofluorescence |
Molecular neurobiology |
Medium |
28540657
|
| 2016 |
UCH-L1 inhibition decreases the microtubule-binding ability of tau and increases tau phosphorylation and abnormal ubiquitination; both pharmacological inhibition of UCH-L1 activity (LDN) and siRNA-mediated knockdown produce these effects in neuronal cell lines. |
UCH-L1 inhibitor LDN; UCH-L1 siRNA in HEK293/tau441 cells; tau-microtubule binding assay; immunofluorescence; immunoprecipitation; phosphorylation analysis |
Journal of Alzheimer's disease : JAD |
Medium |
26444754
|
| 2012 |
UCHL1 interacts with NCAM180 (and NCAM140) isoforms of the neural cell adhesion molecule; overexpression of UCHL1 decreases constitutive ubiquitination of NCAM180 and NCAM140 and reduces their lysosomal localization, indicating UCHL1 regulates NCAM ubiquitination and intracellular trafficking/recycling. |
Protein macroarray screening; co-immunoprecipitation; colocalization in primary neurons; UCHL1 overexpression and inhibition; ubiquitination assays; lysosomal trafficking assays |
The FEBS journal |
Medium |
23061666
|
| 2015 |
UCHL-1 is aberrantly recruited to mitochondria by NH2-terminal tau fragment (NH2htau) in neurons; shRNA-mediated silencing of UCHL-1 (or Parkin) suppresses excessive mitophagy induced by NH2htau, restores synaptic and mitochondrial content, and provides partial protection against NH2htau-induced neuronal death; endogenous NH2htau is associated with UCHL-1 and Parkin in mitochondria from human AD synapses. |
shRNA silencing of UCHL-1; mitophagy assays; mitochondrial fractionation; co-immunoprecipitation from human AD synaptic mitochondria; cell viability assays; primary hippocampal neurons |
Human molecular genetics |
Medium |
25687137
|
| 2020 |
UCHL1 deubiquitinates CD36 (a scavenger receptor), stabilizing it and promoting oxidized LDL uptake and foam cell formation; UCHL1 inhibition or deletion increases K48-polyubiquitination of CD36 and reduces its protein levels, decreasing lipid accumulation. |
UCHL1 siRNA; UCHL1 inhibitor; ubiquitination assay for CD36; Western blot; lipid uptake assays |
Cell death & disease |
Medium |
32801299
|
| 2021 |
UCHL1 interacts with IκBα protein and inhibits its K48-linked ubiquitination and proteasomal degradation; UCHL1 inhibition blocks LPS-induced IκBα degradation, suppresses NF-κB nuclear translocation, reduces ERK1/2 phosphorylation, and decreases pro-inflammatory cytokine production in macrophages. |
Co-immunoprecipitation; ubiquitination assay; UCHL1 inhibitor; Western blot for IκBα, phospho-ERK1/2, NF-κB; ELISA for IL-6 and TNF-α; in vivo LPS model |
Cell biology international |
Medium |
34288216
|
| 2019 |
UCHL1 regulates mTORC1 and mTORC2 balance in skeletal muscle; skeletal muscle-specific knockout of UCHL1 increases mTORC1 activity and decreases mTORC2 activity in slow-twitch (soleus) but not fast-twitch (EDL) muscle, leading to enlarged slow-twitch muscle fibers; UCHL1 knockdown decreases PRAS40 protein turnover, contributing to increased mTORC1 activity. |
Skeletal muscle-specific UCHL1 knockout mice; C2C12 siRNA knockdown; mTORC1/2 activity assays (phosphorylation of downstream targets); fiber type staining; PRAS40 protein turnover assay |
Life sciences |
Medium |
31356902
|
| 2020 |
UCHL1 hydrolase activity is required for normal axonal conduction and protection after traumatic brain injury; C90A knock-in mice (devoid of hydrolase activity) show increased axonal injury, greater hippocampal neuron loss, elevated polyubiquitinated proteins and Beclin-1 after controlled cortical impact, suggesting the hydrolase activity maintains UPS function and suppresses autophagy after TBI. |
C90A hydrolase-dead knock-in mouse; controlled cortical impact TBI model; histology; immunohistochemistry for APP and SMI-32; polyubiquitin and Beclin-1 Western blot; behavioral beam balance test |
Experimental neurology |
High |
33159930
|
| 2024 |
UCHL1 interacts with the NACHT domain of NLRP3 inflammasome; UCH-L1 downregulation decreases pro-IL-1β levels; pharmacological UCH-L1 inhibition interferes with NLRP3 puncta formation and ASC oligomerization, reducing IL-1β cleavage and secretion particularly in microglia. |
Proximity labeling (affinity purification); RNAi screening; co-immunoprecipitation; NLRP3 puncta imaging; ASC oligomerization assay; UCHL1 chemical inhibition; IL-1β ELISA |
Cell reports |
Medium |
38669140
|
| 2001 |
Uch-L1 and Uch-L3 have both separate and overlapping functions in maintaining axonal integrity: double Uch-L1/Uch-L3 knockout mice display earlier lethality, dysphagia, and more severe axonal degeneration of the gracile tract, nucleus tractus solitarius, and area postrema than either single knockout, demonstrating redundant and distinct roles in neuronal maintenance. |
Uch-L1/Uch-L3 double-knockout mouse generation; histological analysis of axonal degeneration; behavioral and survival analysis |
Human molecular genetics |
High |
11555633
|
| 2024 |
UCHL1 deubiquitinates and stabilizes Sox17 in endothelial cells; conditional UCHL1 knockout impairs endothelial cell proliferation, migration, tube formation, angiogenesis, and blood-spinal cord barrier recovery after spinal cord injury, while UCHL1 overexpression promotes these processes. |
Immunoprecipitation-mass spectrometry; co-immunoprecipitation; conditional UCHL1 knockout mice; Sox17 knockdown/overexpression; in vitro endothelial cell assays; in vivo SCI model |
Cellular and molecular life sciences : CMLS |
Medium |
38478109
|
| 2025 |
UCHL1 stabilizes PFKFB3 (a glycolytic regulator) in astrocytes by cleaving K48-linked ubiquitin chains; UCHL1/PFKFB3 axis increases lactate production, leading to histone H4K8 lactylation and subsequent transcriptional upregulation of Uchl1 and glycolysis genes, forming a positive feedback loop that sustains astrocytic glycolytic reprogramming and prevents neuronal ferroptosis after spinal cord injury. |
Genetic Uchl1 deletion; PFKFB3 knockout; K48-linked ubiquitination assay; histone lactylation assay; co-immunoprecipitation; scRNA-seq analysis; in vivo SCI model |
Cell death and differentiation |
Medium |
40016338
|
| 2024 |
RANKL stimulates UCHL1 expression in osteoclast precursors; UCHL1 stabilizes CD13 (deubiquitinates it), augmenting soluble CD13 (sCD13) release, which exerts an autocrine inhibitory effect on the MAPK pathway to suppress osteoclast formation; conditional UCHL1 deletion in osteoclast precursors exacerbates OA while overexpression alleviates it. |
Conditional UCHL1 knockout mice; AAV9-UCHL1 overexpression; osteoclast differentiation assays; co-immunoprecipitation; ubiquitination assay for CD13; MAPK pathway analysis; human and murine OA specimens |
Nature communications |
High |
39389988
|
| 2023 |
UCHL1 deubiquitinates and stabilizes TAZ at K46 (removing K48-linked polyubiquitin); stabilized TAZ competes with calcineurin A (CNA) for binding to NFATC1, inhibiting NFATC1 dephosphorylation and nuclear transport, thereby suppressing osteoclastogenesis; osteoclast-specific UCHL1 knockout mice develop severe osteoporosis. |
Osteoclast-specific conditional UCHL1 knockout mice; co-immunoprecipitation; in vitro ubiquitination/deubiquitination assay; K46 mutagenesis; NFATC1 nuclear transport assay; ovariectomy bone loss model |
International journal of biological sciences |
High |
37215988
|
| 2022 |
UCHL1 binds, deubiquitinates, and stabilizes HIF-1α following myocardial infarction; UCHL1 knockout cardiomyocytes (via CRISPR/Cas9 in hiPSCs) show reduced HIF-1α expression and suppressed HIF-1α target genes; recombinant UCHL1 and AAV9-cardiac UCHL1 delivery protect against MI in mice. |
BioID proximity labeling + mass spectrometry; CRISPR/Cas9 UCHL1 knockout hiPSC-derived cardiomyocytes; Western blot for HIF-1α; HIF-1α target gene qRT-PCR; recombinant UCHL1 IP injection; AAV9-UCHL1 cardiac delivery; MI mouse model |
Redox biology |
Medium |
35339825
|
| 2019 |
UCH-L1 regulates lung endothelial barrier function; UCHL1 knockdown or pharmacological inhibition (LDN-57444) decreases VE-cadherin and claudin-5 expression, reduces barrier enhancement by HGF, and increases thrombin-induced permeability; silencing FoxO1 transcription factor restores claudin-5 levels; UCHL1 inhibition in vivo increases ventilator-induced lung injury. |
UCHL1 siRNA; LDN-57444 inhibitor; transendothelial electrical resistance; VE-cadherin and claudin-5 Western blot; FoxO1 siRNA rescue; murine VILI model |
American journal of physiology. Lung cellular and molecular physiology |
Medium |
33438509
|
| 2024 |
UCHL1 deficiency attenuates pulmonary arterial hypertension via reduction of AKT1; UCHL1 deubiquitinates AKT1 (specifically promotes K63-linked and reduces K48-linked ubiquitination), maintaining higher AKT1 levels; Uchl1 knockout rats and conditional Uchl1 knockout mice show reduced right ventricular hypertrophy, pressure, and vascular remodeling. |
UCHL1-silenced human pulmonary artery endothelial cells; Uchl1 knockout rats; conditional Uchl1 knockout mice (Tie2Cre); LDN57444 pharmacological inhibition; K63/K48-ubiquitinated Akt detection; right ventricular hemodynamics; vascular histology; three preclinical PAH models |
Circulation |
High |
38695173
|
| 2023 |
UCHL1 binds, deubiquitinates, and stabilizes POM121 (a nuclear pore complex nucleoporin); stabilized POM121 regulates nuclear transport of E2F1 and c-MYC, maintaining neuroendocrine differentiation and promoting cancer progression in neuroendocrine carcinomas. |
Co-immunoprecipitation; deubiquitination assay; loss-of-function (siRNA/UCHL1 KO); nuclear fractionation for E2F1 and c-MYC; in vivo tumor growth and metastasis assays; UCHL1 inhibitor LDN-57444 |
Cell reports. Medicine |
Medium |
38244540
|
| 2023 |
UCHL1 interacts with, deubiquitylates, and stabilizes ferredoxin reductase (FDXR), an important mitochondrial iron homeostasis protein; HCMV infection-induced loss of UCHL1 causes FDXR ubiquitination and degradation, leading to mitochondrial iron overload, AIM2 inflammasome activation, and vascular endothelial inflammatory injury. |
Co-immunoprecipitation; ubiquitination assay for FDXR; UCHL1 knockdown; HCMV infection model; mitochondrial iron measurement; AIM2 inflammasome activation assay; MCMV-infected mice |
Free radical biology & medicine |
Medium |
38081437
|
| 2019 |
UCH-L1 promotes cross-presentation of antigens by dendritic cells by facilitating MHC class I molecule recycling; UCH-L1-deficient DCs have reduced ability to generate MHC I–peptide complexes and to cross-prime CD8 T cells in vivo; antigen uptake and phagosome maturation are unaffected, while intracellular MHC I colocalization with late endosomal/lysosomal compartments is reduced. |
UCH-L1-deficient mice; in vivo and in vitro CD8 T cell cross-priming assays; MHC I recycling assay; phagocytosis and phagosome maturation assays; MHC I colocalization imaging |
Journal of immunology |
Medium |
31492742
|
| 2014 |
UCH-L1 activity increases podocyte hypertrophy and total protein content in membranous nephropathy; mechanistically, UCH-L1 increases cytoplasmic p27Kip1 by promoting its nuclear export and decreasing its poly-ubiquitination and proteasomal degradation; inhibition of UCH-L1 attenuates podocyte hypertrophy. |
UCH-L1 overexpression and knockdown in podocytes; UCH-L1 inhibitor; p27Kip1 nuclear/cytoplasmic fractionation; ubiquitination assay for p27Kip1; protein content measurement; human and rat MGN tissue analysis |
Biochimica et biophysica acta |
Medium |
24583340
|
| 2016 |
UCH-L1 absence causes pure motor neuropathy with selective degeneration of motor (not sensory) axons; neuromuscular junctions are impaired in both slow- and fast-twitch muscle groups but spinal motor neuron cell bodies remain intact without signs of ER stress, indicating UCHL1 is specifically required for NMJ and motor axon maintenance rather than motor neuron survival. |
Uchl1(nm3419) UCHL1-/- mice; molecular and cellular marker expression analysis; electrophysiological recordings; NMJ morphological analysis; axon and sensory neuron histology |
Annals of clinical and translational neurology |
High |
27231703
|
| 2021 |
UCHL1 promotes HGSOC (high-grade serous ovarian cancer) growth by maintaining protein homeostasis via the PSMA7-APEH-proteasome axis; UCHL1 silencing reduces PSMA7 and APEH expression and proteasome activity, causes polyubiquitinated protein accumulation, attenuates mTORC1 activity and protein synthesis, and induces terminal UPR. |
UCHL1 siRNA in HGSOC cells; in vivo xenograft metastasis model; transcriptional profiling; PSMA7 and APEH knockdown; proteasome activity assay; polyubiquitin accumulation; mTORC1 signaling assay |
Molecular cancer research : MCR |
Medium |
33753553
|
| 2013 |
NF-κB transcription factor binds the UCH-L1 promoter at –300 bp and –109 bp sites and upregulates UCH-L1 expression; TNF-α and IL-1β cytokine stimulation of podocytes activates NF-κB and rapidly increases UCH-L1 mRNA and protein, while NF-κB inhibition (PDTC) prevents this upregulation. |
Electrophoretic mobility shift assay (EMSA); promoter reporter analysis; NF-κB inhibitor (PDTC); cytokine stimulation of podocytes; Western blot and qRT-PCR; immunohistochemistry of human lupus nephritis biopsies |
Cellular signalling |
Medium |
23567262
|
| 2017 |
UCH-L1 promotes breast cancer cell invasion by interacting preferentially with Akt2 and activating Akt signaling; proximity-dependent BioID identified UCH-L1–Akt interaction, confirmed by pulldown with His-tagged recombinant UCH-L1 from cell lysate; UCH-L1 overexpression increases phosphorylated Akt while knockdown suppresses invasion. |
BioID proximity labeling; streptavidin pulldown; His-tagged recombinant UCH-L1 pulldown; phospho-Akt Western blot; invasion assays; UCH-L1 siRNA |
Journal of cellular biochemistry |
Medium |
28636190
|
| 1996 |
PGP9.5/UCH-L1 was purified to homogeneity from bovine retina by ubiquitin-Sepharose affinity chromatography; the purified protein displays hydrolytic activity on ubiquitin ethyl ester (UbOEt) and reactivity with cysteine and histidine-specific reagents, confirming it is a cysteine/histidine-dependent ubiquitin C-terminal hydrolase with biochemical properties distinguishable from other UCH family members. |
Ubiquitin-Sepharose affinity chromatography; enzymatic assay with UbOEt; cysteine/histidine reagent inhibition; Km determination |
The Biochemical journal |
High |
8809066
|