{"gene":"USP14","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2005,"finding":"Crystal structures of USP14 catalytic domain alone and in complex with ubiquitin aldehyde revealed that, in the absence of ubiquitin, the active site is blocked by two surface loops (BL1 and BL2); ubiquitin binding induces a conformational change that relocates these loops, allowing the ubiquitin C-terminus to access the active site, explaining how USP14 is catalytically activated.","method":"X-ray crystallography (free enzyme and ubiquitin aldehyde complex) combined with biochemical characterization","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structures with functional biochemical validation; foundational structural mechanism paper replicated and extended by subsequent structural studies","pmids":["16211010"],"is_preprint":false},{"year":1997,"finding":"Purified yeast Ubp6 (USP14 ortholog) is a cysteine protease that hydrolyzes ubiquitin-protein fusions and can release ubiquitin from branched polyubiquitin-protein conjugates, and its activity is blocked by sulfhydryl-blocking reagents and ubiquitin aldehyde.","method":"Biochemical purification from E. coli and in vitro enzymatic assays with radiolabeled ubiquitin substrates","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified enzyme and defined substrates; single lab but multiple substrate types tested","pmids":["9344467"],"is_preprint":false},{"year":2003,"finding":"Yeast Ubp6 (USP14 ortholog) is situated in the base subcomplex of the 26S proteasome, and both Ubp6 and Rpn11 serve complementary but distinct deubiquitinating roles on the proteasome; loss of either slows deubiquitination and the double mutant is synthetically lethal.","method":"Purification of proteasomes from rpn11 and ubp6 deletion mutants; in vitro deubiquitination assays; genetic double-mutant lethality","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic epistasis plus biochemical assays with purified proteasomes; replicated and extended by multiple labs","pmids":["14581483"],"is_preprint":false},{"year":2003,"finding":"Loss of yeast Ubp6 depletes the free ubiquitin pool because Ubp6 recycles ubiquitin at the proteasome; overexpression of ubiquitin suppresses all ubp6Δ defects. Human USP14 fully complements ubp6Δ and binds the yeast proteasome via its N-terminal UBL domain, which targets it to the proteasome but is not required for nuclear localization.","method":"Genetic complementation assays in yeast, fluorescence microscopy (Ubp6-GFP localization), ubiquitin-overexpression suppression experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetics, fluorescence microscopy, biochemical suppression); replicated by independent labs","pmids":["14559899"],"is_preprint":false},{"year":2002,"finding":"Usp14 (ax gene product) is a cysteine protease that cleaves ubiquitin-tagged protein substrates in vitro but cannot process polyubiquitin chains; loss-of-function in ax(J) mice causes synaptic transmission defects in central and peripheral nervous systems without neuronal loss or protein aggregates, indicating a role in regulating synaptic activity via ubiquitin processing.","method":"Positional cloning; in vitro deubiquitination assays; electrophysiology in ax(J) mice","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined molecular and physiological phenotypes; foundational study replicated by subsequent work","pmids":["12368914"],"is_preprint":false},{"year":2005,"finding":"Usp14 co-fractionates with proteasomes isolated from mouse liver and brain; loss of Usp14 in ax(J) mice reduces monomeric ubiquitin levels ~35% in most tissues, demonstrating that Usp14 functions to maintain cellular free ubiquitin pools in mammals.","method":"Subcellular fractionation/co-fractionation with proteasomes; quantitative immunoblotting of free ubiquitin in ax(J) tissues","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct fractionation experiment combined with quantitative biochemistry; independently corroborated by multiple subsequent studies","pmids":["16190881"],"is_preprint":false},{"year":2006,"finding":"Yeast Ubp6 (USP14 ortholog) can delay proteasomal degradation of ubiquitinated proteins through a noncatalytic, proteasome-inhibitory function independent of its deubiquitinating activity; it also gradually deubiquitinates substrates over time, creating a switch in ubiquitin chain processing mode from en bloc removal (by Rpn11) to stepwise trimming.","method":"In vitro and cell-based degradation assays using catalytic-dead Ubp6 mutants; pulse-chase experiments; comparison with Rpn11 activity","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution assays plus catalytic-dead mutant distinguish catalytic and noncatalytic functions; high-impact study widely replicated","pmids":["17018280"],"is_preprint":false},{"year":2009,"finding":"USP14 interacts with the cytoplasmic region of IRE1α; USP14 overexpression inhibits ER-associated degradation (ERAD), and USP14 knockdown activates ERAD, identifying USP14 as a physiological inhibitor of ERAD under non-stressed conditions.","method":"Co-immunoprecipitation; siRNA knockdown; ERAD activity assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional knockdown/overexpression; single lab, two complementary methods","pmids":["19135427"],"is_preprint":false},{"year":2009,"finding":"Usp14 is indispensable for synaptic development and function at neuromuscular junctions (NMJs); Usp14-deficient mice show presynaptic phosphorylated neurofilament accumulations, nerve terminal sprouting, and postsynaptic acetylcholine receptor immaturity. The greatest ubiquitin depletion occurred in synaptosomal fractions. Transgenic restoration of Usp14 in neurons corrected ubiquitin levels and NMJ defects.","method":"Genetic rescue (transgenic neuron-specific Usp14 re-expression in ax(J) mice); immunofluorescence; synaptosomal fractionation; electrophysiology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue with defined phenotypic readouts, fractionation showing synaptosomal ubiquitin depletion; multiple orthogonal methods","pmids":["19726649"],"is_preprint":false},{"year":2011,"finding":"The catalytic activity of Ubp6 (USP14 ortholog) is required for maturation of the 26S proteasome 19S regulatory particle; Ubp6 is an additional member of the Hsm3 chaperone module, and genetic interactions show functional overlap with Hsm3 but not other RP chaperones. Ubp6 facilitates assembly by clearing ubiquitylated substrates from assembly precursors.","method":"Quantitative proteomics and native mass spectrometry of intact proteasome complexes; genetic interaction analysis (ubp6/hsm3 double deletions)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — quantitative MS of intact complexes plus genetic epistasis; single lab but multiple orthogonal methods","pmids":["21658604"],"is_preprint":false},{"year":2013,"finding":"USP14 mediates deubiquitination of Dishevelled (Dvl) at K63-linked polyubiquitin chains, and genetic or chemical suppression of USP14 increases Dvl polyubiquitination and impairs downstream Wnt/β-catenin signaling, placing USP14 as a positive regulator of canonical Wnt signaling.","method":"siRNA screen; Co-immunoprecipitation; ubiquitin chain-type analysis; chemical inhibitor experiments; Wnt reporter assays","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — siRNA screen validated with Co-IP and functional signaling assays; single lab","pmids":["23958854"],"is_preprint":false},{"year":2013,"finding":"USP14 regulates hippocampal synaptic short-term plasticity and synaptic vesicle number through a deubiquitination-independent mechanism; overexpression of catalytically inactive USP14 rescues paired-pulse facilitation deficits and restores vesicle number in Usp14-deficient neurons, and the PPF deficit is also rescued by proteasome inhibition.","method":"Electrophysiology (paired-pulse facilitation); electron microscopy (synaptic vesicle counting); catalytic-dead USP14 overexpression rescue; pharmacological proteasome inhibition","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — catalytic-dead mutant rescue combined with electrophysiology and EM; multiple orthogonal methods in single lab","pmids":["24218545"],"is_preprint":false},{"year":2015,"finding":"Cryo-EM combined with cross-linking/MS showed that Ubp6 binds the proteasome via its N-terminal UBL domain to Rpn1, while its catalytic USP domain is variably positioned. In the presence of ubiquitin aldehyde, the USP domain is stabilized bridging Rpn1 and Rpt1, with the active site positioned near the ATPase ring mouth and Rpn11. Ubp6 binding drives the proteasome into an intermediate conformational state, explaining kinetic effects on degradation.","method":"Single-particle cryo-EM; cross-linking mass spectrometry; proteasome conformational state analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with cross-linking MS validation; single lab but rigorous structural methodology","pmids":["26130806"],"is_preprint":false},{"year":2016,"finding":"USP14 shows marked preference for substrates bearing multiple ubiquitin modifications or chains (multi-site ubiquitinated substrates) independent of chain linkage type, removing chains en bloc until a single chain remains. This specificity is conserved from yeast to humans. Single-molecule studies showed USP14-dependent deubiquitination reduces dwell time of ubiquitin conjugates at the proteasome, acting on a millisecond timescale to reject substrates before degradation initiates.","method":"In vitro deubiquitination assays with defined ubiquitin-cyclin B conjugates; single-molecule fluorescence; yeast–human conservation experiments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro assays with defined substrates plus single-molecule measurements; conservation across species; multiple orthogonal approaches","pmids":["27074503"],"is_preprint":false},{"year":2017,"finding":"USP14 allosterically inhibits multiple 26S proteasome activities (peptidase, ATPase, Rpn11-dependent deubiquitination) in the absence of ubiquitinated substrates; a catalytically inactive USP14 mutant retains this inhibitory activity, confirming it is noncatalytic. Proteasomes lacking Usp14 show elevated basal peptidase activity, enhanced ATPase activity, and are able to degrade non-ubiquitinated proteins at much higher rates.","method":"Biochemical comparison of proteasomes purified from Usp14-knockout vs. wild-type MEFs; addition of purified catalytic-dead Usp14 mutant; multiple enzymatic activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified proteasomes with defined Usp14 knockout combined with catalytic-dead mutant reconstitution; multiple activity assays; single lab but rigorous","pmids":["28416611"],"is_preprint":false},{"year":2017,"finding":"Ubiquitinated proteins promote association of both Usp14 and Ube3c with 26S proteasomes; when ubiquitin conjugates are hydrolyzed or ubiquitination is prevented, Usp14 and Ube3c rapidly dissociate. Recombinant Usp14 binds purified proteasomes preferentially when they contain ubiquitin conjugates, and inhibitors (IU-1 or ubiquitin aldehyde) enhance binding. Usp14 and Ube3c cycle on/off together in a substrate-dependent manner.","method":"Native co-immunoprecipitation from cell extracts; addition of recombinant Usp14 to purified proteasomes; small molecule inhibitor experiments; quantitative immunoblotting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal pulldowns plus purified-protein reconstitution; multiple complementary experimental approaches; single lab","pmids":["28396413"],"is_preprint":false},{"year":2018,"finding":"The UBL domain of Usp14 alone, when added to purified 26S proteasomes, stimulates the same activities that full-length Usp14 inhibits (peptide entry/hydrolysis, protein-dependent ATPase, Rpn11 deubiquitination, and degradation of both ubiquitinated and non-ubiquitinated proteins), apparently by binding Rpn1's T2 site to allosterically activate the proteasome.","method":"Biochemical assay of isolated UBL domain added to purified 26S proteasomes; comparison with Usp14-knockout proteasomes; cell-based protein degradation assays using UBL-domain expression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution with purified isolated domain plus multiple enzymatic assays; single lab but rigorous mechanistic dissection","pmids":["30487212"],"is_preprint":false},{"year":2018,"finding":"USP14 directly interacts with and deubiquitinates androgen receptor (AR), stabilizing AR protein by removing its ubiquitin chain. Inhibition or knockdown of USP14 accelerates K48-linked ubiquitination and proteasome-mediated degradation of AR in breast cancer cells.","method":"Co-immunoprecipitation; ubiquitination assays; cycloheximide chase; pharmacological and siRNA inhibition of USP14","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus ubiquitination assays and proteasome inhibitor rescue; single lab, two orthogonal methods","pmids":["29353883"],"is_preprint":false},{"year":2018,"finding":"USP14 interacts with RNF168 (via RNF168's MIU1 domain) and directly deubiquitinates it in vitro; USP14 is itself a substrate of autophagy (interacting with MAP1LC3B and the UBA domain of SQSTM1/p62). USP14 antagonizes RNF168-dependent ubiquitin signaling and downstream 53BP1 chromatin recruitment at DNA double-strand breaks.","method":"Co-immunoprecipitation; colocalization by immunofluorescence; in vitro deubiquitination assay; autophagy substrate assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro deubiquitination assay plus reciprocal Co-IP and domain mapping; single lab","pmids":["29995557"],"is_preprint":false},{"year":2018,"finding":"USP14 directly interacts with and stabilizes FASN (fatty acid synthase) by deubiquitination; USP14 overexpression promotes liver triglyceride accumulation in mice, while genetic ablation or pharmacological inhibition of USP14 ameliorates hepatosteatosis, hyperglycemia and insulin resistance in obese mice.","method":"Proteome, ubiquitinome and interactome analysis; Co-immunoprecipitation; in vivo mouse models (overexpression and knockout); IU1 pharmacological inhibition","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteome-wide substrate screening combined with Co-IP validation and in vivo genetic/pharmacological experiments; multiple orthogonal methods","pmids":["30425250"],"is_preprint":false},{"year":2018,"finding":"TRIM11 binds both the proteasome and USP14, precluding their association, thereby relieving USP14-mediated noncatalytic inhibition of the proteasome and increasing overall proteasome activity and protein degradation.","method":"Co-immunoprecipitation; in vitro proteasome activity assays; knockdown/overexpression experiments","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP demonstrating TRIM11-USP14-proteasome interactions combined with functional activity assays; single lab","pmids":["29581427"],"is_preprint":false},{"year":2018,"finding":"USP14 promotes K48-linked ubiquitination and proteasome-mediated degradation of IκBα by removing its ubiquitin chain, thereby promoting NF-κB activation. USP14 was found to associate with RelA, which acts as a linker between USP14 and IκBα. LPS treatment induces serine phosphorylation of USP14.","method":"Co-immunoprecipitation; ubiquitination assay; cycloheximide chase; Western blot; cytokine ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with functional assays; single lab; consistent results across multiple readouts but mechanistic evidence is indirect","pmids":["23615914"],"is_preprint":false},{"year":2018,"finding":"USP14 promotes mitophagy independently of PINK1 and Parkin by triggering mitochondrial fragmentation and membrane rupture that exposes the LC3 receptor Prohibitin 2; genetic and pharmacological inhibition of USP14 corrects mitochondrial dysfunction and locomotion defects in PINK1/Parkin mutant Drosophila.","method":"Genetic and pharmacological (IU1) USP14 inhibition in cell lines and Drosophila PD model; LC3/Prohibitin 2 localization; mitochondrial morphology assays; behavior tests","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo Drosophila genetic model with locomotion readout plus cell biological mechanistic dissection; single lab","pmids":["30249595"],"is_preprint":false},{"year":2018,"finding":"USP14 directly interacts with CXCR4 or its C-terminus in a CXCL12-stimulated, time-dependent manner; USP14 catalyzes CXCR4 deubiquitination. Knockdown of USP14 blocks deubiquitination and CXCR4 degradation, while overexpression promotes deubiquitination. Both overexpression and knockdown of USP14 block CXCL12-mediated chemotaxis, indicating that a ubiquitination-deubiquitination cycle on CXCR4 is required for chemotaxis. ERK activation is independent of CXCR4 ubiquitination status.","method":"Co-immunoprecipitation; co-localization by immunofluorescence; RNAi knockdown; ubiquitination assays; chemotaxis assays; use of ubiquitination-deficient CXCR4 mutant","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with functional knockdown, mutant rescue and chemotaxis assays; single lab","pmids":["19106094"],"is_preprint":false},{"year":2019,"finding":"USP14 stabilizes CBP (CREB-binding protein) via deubiquitination, thereby enhancing glucagon action and hepatic gluconeogenesis. ER stress upregulates USP14 expression; liver-specific USP14 knockdown abrogates ER stress-induced effects on glucose metabolism and improves hyperglycemia in obese mice.","method":"In vivo hepatic USP14 overexpression and knockdown; ubiquitination assays; Co-immunoprecipitation; glucose tolerance tests in obese mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo liver-specific knockdown with metabolic readouts plus ubiquitination assays; single lab but multiple methods","pmids":["31594848"],"is_preprint":false},{"year":2019,"finding":"USP14 interacts with the chaperone HSC70 in neuroblastoma cells; proteasome inhibition enhances USP14-HSC70 binding and also promotes interaction with XBP1u and IRE1α (UPR components). Inhibition of HSC70 downregulates USP14, and proteasome inhibition or W58A-USP14 (proteasome-binding mutant) promotes USP14 interaction with GABARAP, increasing autophagosomes.","method":"MS-based interactomics; co-immunoprecipitation; pharmacological HSC70 inhibition; fluorescence microscopy of autophagosomes","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — MS interactome plus Co-IP validation and functional imaging; single lab","pmids":["31901637"],"is_preprint":false},{"year":2019,"finding":"USP14 inhibition (via IU1 inhibitor or siRNA) impairs autophagic flux specifically at the autophagosome-lysosome fusion step, with UVRAG as a checkpoint. This indicates USP14 activity has opposing roles in the two major proteolytic pathways: its inhibition enhances proteasomal activity but simultaneously blocks autophagic flux.","method":"Autophagy flux assays (LC3 lipidation, p62 accumulation); lysosomal fusion assays; USP14 pharmacological inhibition and siRNA; UVRAG functional analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple autophagy flux readouts with pharmacological and genetic perturbation; single lab","pmids":["30021169"],"is_preprint":false},{"year":2020,"finding":"USP14 is a deubiquitinase for Ku70; mass spectrometry identified USP14 interaction with Ku70 and other NHEJ proteins, and an in vitro assay confirmed USP14 directly deubiquitinates Ku70. AKT-mediated Ser432 phosphorylation of USP14 is required for its DSB recruitment (IRIF formation). USP14 negatively regulates NHEJ in autophagy- and PTEN-deficient cells.","method":"Mass spectrometry; co-immunoprecipitation; in vitro deubiquitination assay; NHEJ reporter assay; immunofluorescence IRIF formation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro deubiquitination assay plus MS and Co-IP; AKT phosphorylation identified; single lab with multiple methods","pmids":["31740976"],"is_preprint":false},{"year":2020,"finding":"USP14 directly deubiquitinates K63-linked ubiquitin chains on RIG-I; USP14 knockdown enhances RIG-I-triggered type I IFN signaling and inhibits VSV replication, while overexpression attenuates IFN-β expression, identifying USP14 as a negative regulator of antiviral immunity.","method":"Co-immunoprecipitation; ubiquitination assay (K63-linkage specific); siRNA knockdown; viral replication assays; in vivo mouse experiments with IU1","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with K63-linkage-specific ubiquitination assay plus functional viral/IFN assays; single lab","pmids":["30466171"],"is_preprint":false},{"year":2022,"finding":"High-resolution cryo-EM of human USP14 bound to the 26S proteasome in 13 distinct conformational states revealed: ubiquitin-dependent activation of USP14 allosterically reprograms the AAA-ATPase motor conformation and stimulates core particle gate opening; dynamic USP14-ATPase interactions decouple ATPase activity from RPN11 deubiquitination; USP14 introduces three regulatory checkpoints at ubiquitin recognition, substrate translocation initiation, and ubiquitin chain recycling steps.","method":"Time-resolved single-particle cryo-EM; conformational state classification of proteasome intermediates during degradation of polyubiquitylated proteins","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution time-resolved cryo-EM capturing 13 states during active substrate processing; most rigorous structural mechanism study to date","pmids":["35477760"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of yeast proteasome bound to Ubp6 identified an ILR element within the BL1 loop that mediates Rpt1 interaction to activate Ubp6; mutations in the ILR element abrogate both Ubp6 activation and its noncatalytic proteasome inhibition, demonstrating these two functions are mechanistically linked via the same interface. Ubp6 and ubiquitin together drive the proteasome into a unique inhibited conformation.","method":"Single-particle cryo-EM; site-directed mutagenesis of Ubp6 and Rpt1; biochemical activity assays with mutants","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structures plus mutagenesis with functional validation; multiple orthogonal methods in single study","pmids":["35149681"],"is_preprint":false},{"year":2022,"finding":"USP14 directly deubiquitinates IDO1 via its deubiquitinase activity, stabilizing the IDO1 protein; knockdown or inhibition of USP14 decreases IDO1 expression, reverses T-cell suppression, and increases responsiveness to anti-PD-1 therapy in a syngeneic mouse model.","method":"Co-immunoprecipitation; ubiquitination assay; knockdown and pharmacological inhibition of USP14; in vivo syngeneic mouse model (MC38)","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with ubiquitination assays plus in vivo model; single lab, two orthogonal methods","pmids":["36163134"],"is_preprint":false},{"year":2022,"finding":"USP14 catalyzes K48-linked deubiquitination of TAZ, promoting TAZ stabilization; TAZ in turn facilitates transcription of USP14 by binding TEAD1/4 response elements in the USP14 promoter, creating a self-amplifying feedback loop. USP14 does not stabilize the TAZ paralog YAP.","method":"DUB library screening; Co-immunoprecipitation; ubiquitination assays (K48-linkage specific); ChIP/luciferase reporter assays; in vivo xenograft and liver metastasis models","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — unbiased DUB screen followed by ubiquitination assays and transcriptional reporter assays; in vivo validation; single lab","pmids":["35906484"],"is_preprint":false},{"year":2019,"finding":"Usp14 controls ciliogenesis, cilia elongation, and Hedgehog (Hh) signal transduction in mammalian cells; pharmacological inhibition of Usp14 positively affects Hh signaling in a polycystic kidney disease model.","method":"Usp14 knockdown and pharmacological inhibition; cilia length measurements by immunofluorescence; Hh signaling reporter assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pharmacological and genetic inhibition with multiple cellular readouts; single lab","pmids":["30388222"],"is_preprint":false},{"year":2017,"finding":"USP14 interacts with and deubiquitinates vimentin, stabilizing it in gastric cancer cells.","method":"Co-immunoprecipitation; ubiquitination assay","journal":"Oncotarget","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP plus deubiquitination assay; single lab, limited mechanistic depth","pmids":["27448976"],"is_preprint":false},{"year":2017,"finding":"USP14 associates with and stabilizes Aurora kinase B by preventing its FBXW7-mediated ubiquitination and degradation; USP14 overexpression inhibits chemotherapy drug-induced apoptosis in leukemia cells.","method":"Co-immunoprecipitation; cycloheximide chase; deubiquitination assay; flow cytometry apoptosis assays","journal":"Cellular physiology and biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with deubiquitination assay; single lab, single publication","pmids":["28662510"],"is_preprint":false},{"year":2019,"finding":"USP14 interacts with and deubiquitinates CyclinB1, preventing its APC/C-mediated degradation; USP14 knockdown increases CyclinB1 ubiquitination and arrests cells at G2/M phase in breast cancer cells.","method":"Co-immunoprecipitation; ubiquitination assay; flow cytometry cell cycle analysis; USP14 siRNA knockdown","journal":"Pathology, research and practice","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP plus ubiquitination assay; single lab, limited mechanistic rigor","pmids":["31474315"],"is_preprint":false},{"year":2022,"finding":"USP14 interacts with and stabilizes CDK1 by deubiquitinating K48-linked ubiquitin chains; USP14 inhibition causes G2/M cell cycle arrest in breast cancer cells.","method":"Co-immunoprecipitation; ubiquitination assay (K48-linkage specific); flow cytometry; siRNA knockdown","journal":"Acta biochimica et biophysica Sinica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab","pmids":["36604147"],"is_preprint":false},{"year":2023,"finding":"USP14 interacts with and stabilizes JNK by deubiquitination; USP14 ablation reduces JNK protein levels and MAPK/JNK pathway activation, suppressing colorectal tumorigenesis in vitro and in vivo. TNF-α induces USP14 expression, forming a positive feedback loop with JNK.","method":"Co-immunoprecipitation; ubiquitination assay; RNA-seq and luciferase reporter pathway analysis; in vivo colorectal tumor models","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model; single lab","pmids":["36693850"],"is_preprint":false},{"year":2023,"finding":"USP14 deubiquitinates IκBα (removing K48-linked ubiquitin) and binds both IκBα and RELA, reducing IκBα stability and thereby promoting NF-κB activation and IκBα degradation in HNSCC cells.","method":"Co-immunoprecipitation; ubiquitination assay (K48-linkage specific); NF-κB reporter assay; nuclear fractionation; pharmacological and genetic USP14 inhibition","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with linkage-specific ubiquitination assay and reporter assays; in vivo xenograft validation; single lab","pmids":["37055579"],"is_preprint":false},{"year":2021,"finding":"USP14 deubiquitinates and stabilizes NLRP3; USP14 knockdown induces NLRP3 ubiquitination and inhibits pyroptosis of annulus fibrosus cells, while USP14 overexpression promotes pyroptosis through NLRP3/Caspase-1/IL-1β signaling.","method":"Co-immunoprecipitation; ubiquitination assay; flow cytometry (pyroptosis); ELISA (IL-1β, IL-18); gain/loss-of-function experiments","journal":"Acta biochimica et biophysica Sinica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab, single publication","pmids":["36514221"],"is_preprint":false},{"year":2022,"finding":"USP14 deubiquitinates and stabilizes SIRT1 in macrophages, promoting fatty acid oxidation and M2/immunosuppressive macrophage polarization in the tumor microenvironment.","method":"Co-immunoprecipitation; ubiquitination assay; FAO (fatty acid oxidation) assays; OCR measurement; IU1 inhibition in tumor-bearing mice","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay and metabolic readouts; single lab","pmids":["36701891"],"is_preprint":false},{"year":2023,"finding":"USP14 deubiquitinates HSP90AA1 (reducing K48-linked ubiquitination), stabilizing it; elevated HSP90AA1 in turn promotes CYP2E1 protein accumulation, driving NAFLD progression through oxidative stress and mitochondrial dysfunction.","method":"Co-immunoprecipitation; ubiquitination assay; in vivo mouse models; hepatocyte-specific USP14 overexpression and knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with ubiquitination assay and in vivo validation; mechanistic chain demonstrated; single lab","pmids":["37633951"],"is_preprint":false},{"year":2024,"finding":"IFNα increases TRIM14 transcription, which recruits USP14 to remove K63-linked ubiquitin chains from PD-L1, thereby preventing p62-mediated recognition and autophagic degradation of PD-L1, leading to immune evasion.","method":"Co-immunoprecipitation; ubiquitination assay (K63-linkage specific); autophagy flux assays; in vivo tumor models with IU1 + IFNα + anti-CTLA4 combination","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with ubiquitination assay and in vivo model; single lab but multiple methods and in vivo validation","pmids":["38424493"],"is_preprint":false},{"year":2025,"finding":"USP14 stabilizes the m6A demethylase ALKBH5 by preventing its K48-linked ubiquitination and degradation (mediated by HECW2); MST4 kinase phosphorylates ALKBH5 at Ser64/69, increasing its interaction with USP14 and promoting deubiquitylation. ALKBH5 in turn interacts with the USP14 transcript in a YTHDF2-dependent manner to sustain USP14 overexpression, forming a positive feedback loop that promotes glioblastoma stem cell radioresistance.","method":"Mass spectrometry; co-immunoprecipitation; ubiquitination assay; phosphorylation mapping; m6A-seq; transcriptome analysis; in vivo xenograft models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS with Co-IP and ubiquitination assays plus in vivo xenograft model; multiple orthogonal methods; single lab","pmids":["39990235"],"is_preprint":false},{"year":2021,"finding":"USP14 directly binds ubiquitin chains on viral VP16 protein through its UBL domain; USP14 inactivation triggers EIF2AK3/PERK- and ERN1/IRE1-mediated ER stress, which drives K63-linked ubiquitination of VP16 and its degradation via SQSTM1/p62-mediated selective autophagy, inhibiting alphaherpesvirus replication.","method":"Co-immunoprecipitation; ubiquitination assay; ER stress pathway analysis; USP14 null cell rescue; CRISPR knockout; in vivo mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with ubiquitination assays and in vivo validation; single lab but multiple methods","pmids":["34822318"],"is_preprint":false},{"year":2022,"finding":"USP14 interacts with, deubiquitinates, and stabilizes MFG-E8 in human bronchial epithelial cells, inhibiting its proteasomal degradation; cigarette smoke reduces USP14 expression, decreasing MFG-E8 abundance and antiferroptotic protection.","method":"Co-immunoprecipitation; ubiquitination assay; siRNA knockdown; Western blot","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab","pmids":["36596780"],"is_preprint":false},{"year":2020,"finding":"USP14 directly binds TRAF6 and blocks the USP14-TRAF6 interaction; USP14 inhibition (via compound S5) promotes K63-linked ubiquitination of Beclin1, disrupts Beclin1-Bcl2 interaction, and promotes autophagosome accumulation in M1 macrophages, blocking M1 polarization and alleviating sepsis in CLP mice.","method":"Molecular docking; Co-immunoprecipitation; ubiquitination assay; autophagy flux assays; in vivo CLP mouse model","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model but molecular docking-led discovery; single lab","pmids":["32820146"],"is_preprint":false},{"year":2024,"finding":"ALDH2 reduces the interaction between USP14 and cGAS, promoting K48-linked polyubiquitination and degradation of cGAS at lysine 282 in macrophages; USP14 knockdown in bone marrow cells alleviated proinflammatory responses and protected against atherosclerosis.","method":"Co-immunoprecipitation; ubiquitination assay (K48-linkage, site-specific); bone marrow transplantation; in vivo atherosclerosis model","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with site-specific ubiquitination assay and in vivo bone marrow transplant model; single lab","pmids":["39178733"],"is_preprint":false},{"year":2022,"finding":"USP14 deubiquitinates and stabilizes NLRC5; USP14 overexpression in endothelial cells restrains ox-LDL-stimulated NF-κB activation by protecting NLRC5 from degradation, and USP14 adenoviral overexpression in ApoE−/− mice reduces atherosclerotic lesions.","method":"Co-immunoprecipitation; ubiquitination assay; in vivo ApoE−/− mouse model with adenoviral USP14 overexpression; NF-κB reporter assay","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model; single lab","pmids":["36372300"],"is_preprint":false},{"year":2023,"finding":"GSTM3 stabilizes USP14, which in turn inhibits ubiquitination and degradation of FASN, leading to ferroptosis promotion in NPC under ionizing radiation.","method":"Co-immunoprecipitation; mass spectrometry; immunofluorescence; ubiquitination assay","journal":"British journal of cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab","pmids":["38228715"],"is_preprint":false},{"year":2020,"finding":"Inactive USP14 C114A mutant (requiring intact proteasome-binding domain) causes accumulation of specific ubiquitinated proteins at the proteasome, including β-catenin, which does not accumulate with inactive UCHL5 C88A, demonstrating substrate selectivity between the two proteasome-associated DUBs. USP14 also regulates deubiquitination of proteasomal subunits PSMC1 and PSMD4.","method":"USP14 C114A inactive mutant expression; ubiquitin immunoprecipitation; mass spectrometry; immunoprecipitation/immunoblotting validation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteasome-binding mutant combined with MS-based proteomics and biochemical validation; single lab but multiple substrates confirmed","pmids":["31703099"],"is_preprint":false},{"year":2014,"finding":"Yeast Ubp6 processes Lys11 and Lys63 polyubiquitin chains with increasing efficiency as chain length increases, and shows endo-chain cleavage preference for K48-linked chains (in contrast to Rpn11's random cleavage). Proteasomes deconjugate ubiquitin substrates ~100-fold more efficiently than constituent DUBs alone; incorporation into proteasomes significantly enhances Rpn11 catalytic efficiency.","method":"In vitro deubiquitination assays with defined homogeneous and heterogeneous polyubiquitin conjugates; fluorescently labeled Ub chain substrates; kinetic analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined substrates; rigorous kinetic analysis; multiple chain types compared","pmids":["25389291"],"is_preprint":false}],"current_model":"USP14 (yeast Ubp6) is a proteasome-associated cysteine deubiquitinase that binds the 19S regulatory particle base via its N-terminal UBL domain (to Rpn1) and exists in an autoinhibited conformation blocked by BL1/BL2 loops; interaction with Rpt1 (ILR element) and ubiquitin-chain binding relieves autoinhibition and activates catalysis, whereupon USP14 preferentially removes ubiquitin chains en bloc from multi-site ubiquitinated substrates on a millisecond timescale, reducing substrate dwell time and antagonizing degradation, while also allosterically inhibiting multiple proteasome activities (peptidase, ATPase, Rpn11) in the absence of substrate through a noncatalytic mechanism; upon ubiquitin chain engagement, USP14 allosterically reprograms the ATPase motor conformation, stimulates core particle gate opening, and introduces three substrate-editing checkpoints; beyond the proteasome, USP14 stabilizes numerous cellular substrates (AR, IDO1, FASN, TAZ, JNK, CDK1, CyclinB1, SIRT1, NLRP3, Ku70, and others) by direct deubiquitination, regulates Wnt/Dishevelled and RIG-I antiviral signaling, controls synaptic vesicle number and NMJ development through a catalysis-independent function, promotes mitophagy via Prohibitin-2 exposure, and maintains cellular free ubiquitin pools, collectively explaining its roles in neurodegenerative disease, cancer, metabolism, and immunity."},"narrative":{"mechanistic_narrative":"USP14 is a proteasome-associated cysteine deubiquitinase that controls the entry of ubiquitinated substrates into the 26S proteasome and broadly stabilizes specific cellular proteins by removing their ubiquitin chains [PMID:9344467, PMID:14581483, PMID:27074503]. Its catalytic domain is held in an autoinhibited state by two surface loops (BL1/BL2) that occlude the active site until ubiquitin binding displaces them, positioning the ubiquitin C-terminus for hydrolysis [PMID:16211010]. USP14 docks onto the 19S regulatory particle base via its N-terminal UBL domain, which binds Rpn1, while its catalytic USP domain bridges Rpn1 and Rpt1 and is positioned near the ATPase ring mouth and Rpn11 upon ubiquitin engagement [PMID:26130806, PMID:35149681]. Functionally it acts on two registers: in the absence of substrate it allosterically inhibits proteasome peptidase, ATPase, and Rpn11 activities through a noncatalytic mechanism, whereas upon engaging multi-site ubiquitinated substrates it removes chains en bloc on a millisecond timescale, reducing substrate dwell time and rejecting substrates before degradation commits [PMID:17018280, PMID:27074503, PMID:28416611]; time-resolved cryo-EM shows ubiquitin-dependent USP14 activation reprograms the ATPase motor, stimulates gate opening, and imposes regulatory checkpoints during translocation [PMID:35477760]. Both the activating and inhibitory functions converge on the same Rpt1-binding interface (the ILR element within BL1), mechanistically linking catalysis and allosteric inhibition [PMID:35149681]. USP14 also recycles ubiquitin to maintain cellular free ubiquitin pools, loss of which causes neuromuscular junction and synaptic transmission defects in mice [PMID:14559899, PMID:16190881, PMID:19726649], and it independently controls synaptic vesicle number and short-term plasticity through a catalysis-independent function [PMID:12368914, PMID:24218545]. Beyond the proteasome, USP14 stabilizes diverse substrates by direct deubiquitination — including the androgen receptor, FASN, IDO1, TAZ, and Ku70 — and regulates Wnt/Dishevelled and RIG-I antiviral signaling, with roles spanning DNA repair, metabolism, immunity, and cancer [PMID:27074503, PMID:29353883, PMID:30425250, PMID:31740976, PMID:30466171, PMID:35906484].","teleology":[{"year":1997,"claim":"Establishing whether the USP14 ortholog is itself a functional protease defined the gene as a ubiquitin-specific cysteine protease rather than a structural adaptor.","evidence":"in vitro enzymatic assays with purified yeast Ubp6 and radiolabeled ubiquitin substrates","pmids":["9344467"],"confidence":"High","gaps":["Did not place the enzyme at the proteasome","Chain-length and linkage preferences not yet resolved"]},{"year":2002,"claim":"Linking USP14 loss to a defined physiological phenotype showed the enzyme regulates synaptic transmission in vivo, separating its organismal role from gross protein turnover.","evidence":"positional cloning, in vitro deubiquitination, and electrophysiology in ax(J) mice","pmids":["12368914"],"confidence":"High","gaps":["Reported inability to process polyubiquitin chains conflicted with later proteasome-context findings","Molecular target at the synapse unknown"]},{"year":2003,"claim":"Positioning Ubp6 in the proteasome base and showing it maintains free ubiquitin pools defined USP14 as a proteasome-associated DUB acting alongside Rpn11.","evidence":"proteasome purification from deletion mutants, genetic double-mutant lethality, fluorescence localization, and ubiquitin-overexpression suppression in yeast","pmids":["14581483","14559899"],"confidence":"High","gaps":["Mechanism distinguishing Ubp6 and Rpn11 deubiquitination not yet defined","Structural basis of proteasome docking unresolved"]},{"year":2005,"claim":"Atomic structures revealed how USP14 catalysis is gated, explaining ubiquitin-induced activation, while mammalian fractionation confirmed conservation of its ubiquitin-recycling role.","evidence":"X-ray crystallography of free enzyme and ubiquitin-aldehyde complex; proteasome co-fractionation and free-ubiquitin quantitation in ax(J) mice","pmids":["16211010","16190881"],"confidence":"High","gaps":["Structures of the full proteasome-bound enzyme not yet available","Did not address allosteric effects on the proteasome"]},{"year":2006,"claim":"Distinguishing catalytic from noncatalytic activity showed USP14 can delay degradation independent of deubiquitination, revealing a dual-mode regulator of the proteasome.","evidence":"in vitro and cell-based degradation assays with catalytic-dead Ubp6 and comparison to Rpn11","pmids":["17018280"],"confidence":"High","gaps":["Structural basis of noncatalytic inhibition undefined","Physiological substrates of the timing effect unknown"]},{"year":2011,"claim":"Demonstrating a role in 19S assembly added a developmental dimension to USP14 beyond steady-state regulation.","evidence":"native mass spectrometry of intact proteasomes and ubp6/hsm3 genetic epistasis in yeast","pmids":["21658604"],"confidence":"High","gaps":["Whether the assembly role is conserved in mammals not tested here","Catalytic vs noncatalytic contribution to assembly not fully separated"]},{"year":2014,"claim":"Defining chain-type and chain-length preferences clarified how USP14 cleaves polyubiquitin differently from Rpn11 and how proteasome incorporation boosts overall deconjugation.","evidence":"in vitro kinetic deubiquitination assays with defined homo- and heterogeneous polyubiquitin conjugates","pmids":["25389291"],"confidence":"High","gaps":["Behavior on physiological multi-chain substrates not directly addressed","Single-molecule kinetics on the proteasome not measured here"]},{"year":2016,"claim":"Showing preference for multi-site ubiquitinated substrates with en bloc, millisecond chain removal established USP14's substrate-rejection role as a degradation checkpoint.","evidence":"in vitro reconstitution with defined cyclin B conjugates and single-molecule fluorescence, with yeast-human conservation tests","pmids":["27074503"],"confidence":"High","gaps":["Structural intermediates during chain removal not captured","How rejection is coordinated with translocation unresolved"]},{"year":2015,"claim":"Cryo-EM placed the UBL on Rpn1 and the USP domain bridging Rpn1-Rpt1, explaining how USP14 binding drives a kinetically distinct proteasome conformation.","evidence":"single-particle cryo-EM with cross-linking mass spectrometry of yeast proteasome-Ubp6","pmids":["26130806"],"confidence":"High","gaps":["Conformational dynamics during active substrate processing not resolved at this stage","Activation interface not yet mutationally mapped"]},{"year":2017,"claim":"Quantifying allosteric inhibition of multiple proteasome activities and substrate-driven recruitment cycling defined USP14 as a substrate-gated brake on the proteasome.","evidence":"enzymatic comparison of Usp14-knockout vs wild-type proteasomes with catalytic-dead reconstitution; native co-IP and recombinant-protein binding with inhibitor experiments","pmids":["28416611","28396413"],"confidence":"High","gaps":["The interface responsible for noncatalytic inhibition not yet identified","Co-cycling with Ube3c functionally underexplored"]},{"year":2018,"claim":"Isolating the UBL domain showed it alone stimulates the very activities full-length USP14 inhibits, dissecting domain-specific opposing effects on the proteasome.","evidence":"addition of purified isolated UBL domain to 26S proteasomes with multiple enzymatic and cell-based degradation assays","pmids":["30487212"],"confidence":"High","gaps":["How the catalytic domain overrides UBL stimulation in the full enzyme not fully resolved","In vivo relevance of UBL-only stimulation unclear"]},{"year":2018,"claim":"Identifying direct substrates (AR, FASN) and a regulator (TRIM11) extended USP14 from a proteasome modulator to a stabilizer of disease-relevant proteins.","evidence":"Co-IP, ubiquitination assays, cycloheximide chase, and in vivo mouse metabolic and oncologic models","pmids":["29353883","30425250","29581427"],"confidence":"Medium","gaps":["Direct vs proteasome-context deubiquitination not always disentangled","Reciprocal validation of some interactions limited to single labs"]},{"year":2020,"claim":"Comparing inactive USP14 and UCHL5 mutants demonstrated substrate selectivity among proteasome-associated DUBs and identified accumulating targets including beta-catenin.","evidence":"expression of catalytically dead USP14 C114A, ubiquitin immunoprecipitation, and mass spectrometry","pmids":["31703099"],"confidence":"Medium","gaps":["Mechanistic basis for DUB substrate selectivity unresolved","Direct vs indirect substrate accumulation not fully separated"]},{"year":2022,"claim":"High-resolution time-resolved cryo-EM and ILR-element mutagenesis revealed how ubiquitin-dependent activation reprograms the ATPase motor and mechanistically links activation with noncatalytic inhibition.","evidence":"time-resolved single-particle cryo-EM across 13 proteasome states; cryo-EM with site-directed mutagenesis of the Ubp6 ILR element and Rpt1","pmids":["35477760","35149681"],"confidence":"High","gaps":["How the three checkpoints are regulated in cells not established","Whether human-specific regulators modulate these states unknown"]},{"year":2023,"claim":"A broad panel of substrate-stabilization studies (IDO1, TAZ, Ku70, RIG-I, NLRP3 and others) mapped USP14's reach into immunity, DNA repair, signaling, and metabolism.","evidence":"Co-IP, linkage-specific ubiquitination assays, and in vivo tumor, immune, and metabolic models across multiple labs","pmids":["31740976","30466171","36163134","35906484","37055579","37633951"],"confidence":"Medium","gaps":["Many substrates rest on single-lab Co-IP/ubiquitination assays without reciprocal or structural validation","Whether stabilization occurs at the proteasome or independently is often unclear"]},{"year":null,"claim":"How USP14's proteasome-gating function is integrated with its many reported free-standing substrate-stabilization roles, and which of those substrates reflect direct catalysis versus proteasome-context effects, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying framework distinguishing on-proteasome vs off-proteasome deubiquitination","Most disease substrates lack structural or reconstituted-enzyme confirmation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,13,17,19,27,51,52]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[1,13,52]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,14,16,30]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[44]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,18,27]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,6,13,14,29]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[13,52]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[22,26,45]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,28,33]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[28,43,48]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[18,27]}],"complexes":["26S proteasome","19S regulatory particle"],"partners":["RPN1","RPT1","RPN11","IRE1A","RNF168","RELA","TRIM11","HSC70"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P54578","full_name":"Ubiquitin carboxyl-terminal hydrolase 14","aliases":["Deubiquitinating enzyme 14","Ubiquitin thioesterase 14","Ubiquitin-specific-processing protease 14"],"length_aa":494,"mass_kda":56.1,"function":"Proteasome-associated deubiquitinase which releases ubiquitin from the proteasome targeted ubiquitinated proteins (PubMed:35145029). Ensures the regeneration of ubiquitin at the proteasome (PubMed:18162577, PubMed:28396413). Is a reversibly associated subunit of the proteasome and a large fraction of proteasome-free protein exists within the cell (PubMed:18162577). Required for the degradation of the chemokine receptor CXCR4 which is critical for CXCL12-induced cell chemotaxis (PubMed:19106094). Also serves as a physiological inhibitor of endoplasmic reticulum-associated degradation (ERAD) under the non-stressed condition by inhibiting the degradation of unfolded endoplasmic reticulum proteins via interaction with ERN1 (PubMed:19135427). Indispensable for synaptic development and function at neuromuscular junctions (NMJs) (By similarity). Plays a role in the innate immune defense against viruses by stabilizing the viral DNA sensor CGAS and thus inhibiting its autophagic degradation (PubMed:27666593). Inhibits OPTN-mediated selective autophagic degradation of KDM4D and thereby negatively regulates H3K9me2 and H3K9me3 (PubMed:35145029)","subcellular_location":"Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P54578/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/USP14","classification":"Not Classified","n_dependent_lines":93,"n_total_lines":1208,"dependency_fraction":0.07698675496688742},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PSMC2","stoichiometry":0.2},{"gene":"PSMC4","stoichiometry":0.2},{"gene":"PSMD11","stoichiometry":0.2},{"gene":"PSMD12","stoichiometry":0.2},{"gene":"PSMD2","stoichiometry":0.2},{"gene":"PSMD3","stoichiometry":0.2},{"gene":"PSMD6","stoichiometry":0.2},{"gene":"SAR1B","stoichiometry":0.2},{"gene":"SEM1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/USP14","total_profiled":1310},"omim":[{"mim_id":"609615","title":"QUEUINE tRNA-RIBOSYLTRANSFERASE 1; QTRT1","url":"https://www.omim.org/entry/609615"},{"mim_id":"607274","title":"UBIQUITIN-SPECIFIC PROTEASE 14; USP14","url":"https://www.omim.org/entry/607274"},{"mim_id":"606930","title":"THO COMPLEX, SUBUNIT 1; THOC1","url":"https://www.omim.org/entry/606930"},{"mim_id":"604198","title":"RAS-ASSOCIATED PROTEIN RAB11B; RAB11B","url":"https://www.omim.org/entry/604198"},{"mim_id":"604033","title":"ENDOPLASMIC RETICULUM-TO-NUCLEUS SIGNALING 1; ERN1","url":"https://www.omim.org/entry/604033"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Endoplasmic reticulum","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/USP14"},"hgnc":{"alias_symbol":["TGT","Ubp6"],"prev_symbol":[]},"alphafold":{"accession":"P54578","domains":[{"cath_id":"3.10.20.90","chopping":"4-73","consensus_level":"high","plddt":76.9196,"start":4,"end":73}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P54578","model_url":"https://alphafold.ebi.ac.uk/files/AF-P54578-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P54578-F1-predicted_aligned_error_v6.png","plddt_mean":81.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=USP14","jax_strain_url":"https://www.jax.org/strain/search?query=USP14"},"sequence":{"accession":"P54578","fasta_url":"https://rest.uniprot.org/uniprotkb/P54578.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P54578/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P54578"}},"corpus_meta":[{"pmid":"16211010","id":"PMC_16211010","title":"Structure and mechanisms of the proteasome-associated deubiquitinating enzyme USP14.","date":"2005","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/16211010","citation_count":360,"is_preprint":false},{"pmid":"17018280","id":"PMC_17018280","title":"Deubiquitinating enzyme Ubp6 functions noncatalytically to delay proteasomal degradation.","date":"2006","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/17018280","citation_count":298,"is_preprint":false},{"pmid":"24319254","id":"PMC_24319254","title":"A novel small molecule inhibitor of deubiquitylating enzyme USP14 and UCHL5 induces apoptosis in multiple myeloma and overcomes bortezomib resistance.","date":"2013","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/24319254","citation_count":274,"is_preprint":false},{"pmid":"12368914","id":"PMC_12368914","title":"Synaptic defects in ataxia mice result from a mutation in Usp14, encoding a ubiquitin-specific protease.","date":"2002","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12368914","citation_count":227,"is_preprint":false},{"pmid":"27074503","id":"PMC_27074503","title":"USP14 deubiquitinates proteasome-bound substrates that are ubiquitinated at multiple sites.","date":"2016","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/27074503","citation_count":177,"is_preprint":false},{"pmid":"36163134","id":"PMC_36163134","title":"USP14 promotes tryptophan metabolism and immune suppression by stabilizing IDO1 in colorectal cancer.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/36163134","citation_count":157,"is_preprint":false},{"pmid":"23754622","id":"PMC_23754622","title":"MicroRNA-124 protects against focal cerebral ischemia via mechanisms involving Usp14-dependent REST degradation.","date":"2013","source":"Acta 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neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37062801","citation_count":17,"is_preprint":false},{"pmid":"27629392","id":"PMC_27629392","title":"Knockdown of Ubiquitin-Specific Protease 14 (USP14) Inhibits the Proliferation and Tumorigenesis in Esophageal Squamous Cell Carcinoma Cells.","date":"2016","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/27629392","citation_count":17,"is_preprint":false},{"pmid":"38282961","id":"PMC_38282961","title":"miR-26a-5p Attenuates Oxidative Stress and Inflammation in Diabetic Retinopathy through the USP14/NF-κB Signaling Pathway.","date":"2024","source":"Journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/38282961","citation_count":16,"is_preprint":false},{"pmid":"17553343","id":"PMC_17553343","title":"[Differential expression of USP2, USP14 and UBE4A between ovarian serous cystadenocarcinoma and adjacent normal tissues].","date":"2007","source":"Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17553343","citation_count":16,"is_preprint":false},{"pmid":"24358326","id":"PMC_24358326","title":"Genetic background alters the severity and onset of neuromuscular disease caused by the loss of ubiquitin-specific protease 14 (usp14).","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24358326","citation_count":16,"is_preprint":false},{"pmid":"35648318","id":"PMC_35648318","title":"Inhibition of USP14 enhances anti-tumor effect in vemurafenib-resistant melanoma by regulation of Skp2.","date":"2022","source":"Cell biology and toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/35648318","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51961,"output_tokens":13021,"usd":0.175599,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24745,"output_tokens":5028,"usd":0.124713,"stage2_stop_reason":"end_turn"},"total_usd":0.300312,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structures of USP14 catalytic domain alone and in complex with ubiquitin aldehyde revealed that, in the absence of ubiquitin, the active site is blocked by two surface loops (BL1 and BL2); ubiquitin binding induces a conformational change that relocates these loops, allowing the ubiquitin C-terminus to access the active site, explaining how USP14 is catalytically activated.\",\n      \"method\": \"X-ray crystallography (free enzyme and ubiquitin aldehyde complex) combined with biochemical characterization\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structures with functional biochemical validation; foundational structural mechanism paper replicated and extended by subsequent structural studies\",\n      \"pmids\": [\"16211010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Purified yeast Ubp6 (USP14 ortholog) is a cysteine protease that hydrolyzes ubiquitin-protein fusions and can release ubiquitin from branched polyubiquitin-protein conjugates, and its activity is blocked by sulfhydryl-blocking reagents and ubiquitin aldehyde.\",\n      \"method\": \"Biochemical purification from E. coli and in vitro enzymatic assays with radiolabeled ubiquitin substrates\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified enzyme and defined substrates; single lab but multiple substrate types tested\",\n      \"pmids\": [\"9344467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Yeast Ubp6 (USP14 ortholog) is situated in the base subcomplex of the 26S proteasome, and both Ubp6 and Rpn11 serve complementary but distinct deubiquitinating roles on the proteasome; loss of either slows deubiquitination and the double mutant is synthetically lethal.\",\n      \"method\": \"Purification of proteasomes from rpn11 and ubp6 deletion mutants; in vitro deubiquitination assays; genetic double-mutant lethality\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic epistasis plus biochemical assays with purified proteasomes; replicated and extended by multiple labs\",\n      \"pmids\": [\"14581483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of yeast Ubp6 depletes the free ubiquitin pool because Ubp6 recycles ubiquitin at the proteasome; overexpression of ubiquitin suppresses all ubp6Δ defects. Human USP14 fully complements ubp6Δ and binds the yeast proteasome via its N-terminal UBL domain, which targets it to the proteasome but is not required for nuclear localization.\",\n      \"method\": \"Genetic complementation assays in yeast, fluorescence microscopy (Ubp6-GFP localization), ubiquitin-overexpression suppression experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetics, fluorescence microscopy, biochemical suppression); replicated by independent labs\",\n      \"pmids\": [\"14559899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Usp14 (ax gene product) is a cysteine protease that cleaves ubiquitin-tagged protein substrates in vitro but cannot process polyubiquitin chains; loss-of-function in ax(J) mice causes synaptic transmission defects in central and peripheral nervous systems without neuronal loss or protein aggregates, indicating a role in regulating synaptic activity via ubiquitin processing.\",\n      \"method\": \"Positional cloning; in vitro deubiquitination assays; electrophysiology in ax(J) mice\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined molecular and physiological phenotypes; foundational study replicated by subsequent work\",\n      \"pmids\": [\"12368914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Usp14 co-fractionates with proteasomes isolated from mouse liver and brain; loss of Usp14 in ax(J) mice reduces monomeric ubiquitin levels ~35% in most tissues, demonstrating that Usp14 functions to maintain cellular free ubiquitin pools in mammals.\",\n      \"method\": \"Subcellular fractionation/co-fractionation with proteasomes; quantitative immunoblotting of free ubiquitin in ax(J) tissues\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct fractionation experiment combined with quantitative biochemistry; independently corroborated by multiple subsequent studies\",\n      \"pmids\": [\"16190881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Yeast Ubp6 (USP14 ortholog) can delay proteasomal degradation of ubiquitinated proteins through a noncatalytic, proteasome-inhibitory function independent of its deubiquitinating activity; it also gradually deubiquitinates substrates over time, creating a switch in ubiquitin chain processing mode from en bloc removal (by Rpn11) to stepwise trimming.\",\n      \"method\": \"In vitro and cell-based degradation assays using catalytic-dead Ubp6 mutants; pulse-chase experiments; comparison with Rpn11 activity\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution assays plus catalytic-dead mutant distinguish catalytic and noncatalytic functions; high-impact study widely replicated\",\n      \"pmids\": [\"17018280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"USP14 interacts with the cytoplasmic region of IRE1α; USP14 overexpression inhibits ER-associated degradation (ERAD), and USP14 knockdown activates ERAD, identifying USP14 as a physiological inhibitor of ERAD under non-stressed conditions.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; ERAD activity assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional knockdown/overexpression; single lab, two complementary methods\",\n      \"pmids\": [\"19135427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Usp14 is indispensable for synaptic development and function at neuromuscular junctions (NMJs); Usp14-deficient mice show presynaptic phosphorylated neurofilament accumulations, nerve terminal sprouting, and postsynaptic acetylcholine receptor immaturity. The greatest ubiquitin depletion occurred in synaptosomal fractions. Transgenic restoration of Usp14 in neurons corrected ubiquitin levels and NMJ defects.\",\n      \"method\": \"Genetic rescue (transgenic neuron-specific Usp14 re-expression in ax(J) mice); immunofluorescence; synaptosomal fractionation; electrophysiology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue with defined phenotypic readouts, fractionation showing synaptosomal ubiquitin depletion; multiple orthogonal methods\",\n      \"pmids\": [\"19726649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The catalytic activity of Ubp6 (USP14 ortholog) is required for maturation of the 26S proteasome 19S regulatory particle; Ubp6 is an additional member of the Hsm3 chaperone module, and genetic interactions show functional overlap with Hsm3 but not other RP chaperones. Ubp6 facilitates assembly by clearing ubiquitylated substrates from assembly precursors.\",\n      \"method\": \"Quantitative proteomics and native mass spectrometry of intact proteasome complexes; genetic interaction analysis (ubp6/hsm3 double deletions)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — quantitative MS of intact complexes plus genetic epistasis; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21658604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USP14 mediates deubiquitination of Dishevelled (Dvl) at K63-linked polyubiquitin chains, and genetic or chemical suppression of USP14 increases Dvl polyubiquitination and impairs downstream Wnt/β-catenin signaling, placing USP14 as a positive regulator of canonical Wnt signaling.\",\n      \"method\": \"siRNA screen; Co-immunoprecipitation; ubiquitin chain-type analysis; chemical inhibitor experiments; Wnt reporter assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — siRNA screen validated with Co-IP and functional signaling assays; single lab\",\n      \"pmids\": [\"23958854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USP14 regulates hippocampal synaptic short-term plasticity and synaptic vesicle number through a deubiquitination-independent mechanism; overexpression of catalytically inactive USP14 rescues paired-pulse facilitation deficits and restores vesicle number in Usp14-deficient neurons, and the PPF deficit is also rescued by proteasome inhibition.\",\n      \"method\": \"Electrophysiology (paired-pulse facilitation); electron microscopy (synaptic vesicle counting); catalytic-dead USP14 overexpression rescue; pharmacological proteasome inhibition\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic-dead mutant rescue combined with electrophysiology and EM; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"24218545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cryo-EM combined with cross-linking/MS showed that Ubp6 binds the proteasome via its N-terminal UBL domain to Rpn1, while its catalytic USP domain is variably positioned. In the presence of ubiquitin aldehyde, the USP domain is stabilized bridging Rpn1 and Rpt1, with the active site positioned near the ATPase ring mouth and Rpn11. Ubp6 binding drives the proteasome into an intermediate conformational state, explaining kinetic effects on degradation.\",\n      \"method\": \"Single-particle cryo-EM; cross-linking mass spectrometry; proteasome conformational state analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with cross-linking MS validation; single lab but rigorous structural methodology\",\n      \"pmids\": [\"26130806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"USP14 shows marked preference for substrates bearing multiple ubiquitin modifications or chains (multi-site ubiquitinated substrates) independent of chain linkage type, removing chains en bloc until a single chain remains. This specificity is conserved from yeast to humans. Single-molecule studies showed USP14-dependent deubiquitination reduces dwell time of ubiquitin conjugates at the proteasome, acting on a millisecond timescale to reject substrates before degradation initiates.\",\n      \"method\": \"In vitro deubiquitination assays with defined ubiquitin-cyclin B conjugates; single-molecule fluorescence; yeast–human conservation experiments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro assays with defined substrates plus single-molecule measurements; conservation across species; multiple orthogonal approaches\",\n      \"pmids\": [\"27074503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"USP14 allosterically inhibits multiple 26S proteasome activities (peptidase, ATPase, Rpn11-dependent deubiquitination) in the absence of ubiquitinated substrates; a catalytically inactive USP14 mutant retains this inhibitory activity, confirming it is noncatalytic. Proteasomes lacking Usp14 show elevated basal peptidase activity, enhanced ATPase activity, and are able to degrade non-ubiquitinated proteins at much higher rates.\",\n      \"method\": \"Biochemical comparison of proteasomes purified from Usp14-knockout vs. wild-type MEFs; addition of purified catalytic-dead Usp14 mutant; multiple enzymatic activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified proteasomes with defined Usp14 knockout combined with catalytic-dead mutant reconstitution; multiple activity assays; single lab but rigorous\",\n      \"pmids\": [\"28416611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ubiquitinated proteins promote association of both Usp14 and Ube3c with 26S proteasomes; when ubiquitin conjugates are hydrolyzed or ubiquitination is prevented, Usp14 and Ube3c rapidly dissociate. Recombinant Usp14 binds purified proteasomes preferentially when they contain ubiquitin conjugates, and inhibitors (IU-1 or ubiquitin aldehyde) enhance binding. Usp14 and Ube3c cycle on/off together in a substrate-dependent manner.\",\n      \"method\": \"Native co-immunoprecipitation from cell extracts; addition of recombinant Usp14 to purified proteasomes; small molecule inhibitor experiments; quantitative immunoblotting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pulldowns plus purified-protein reconstitution; multiple complementary experimental approaches; single lab\",\n      \"pmids\": [\"28396413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The UBL domain of Usp14 alone, when added to purified 26S proteasomes, stimulates the same activities that full-length Usp14 inhibits (peptide entry/hydrolysis, protein-dependent ATPase, Rpn11 deubiquitination, and degradation of both ubiquitinated and non-ubiquitinated proteins), apparently by binding Rpn1's T2 site to allosterically activate the proteasome.\",\n      \"method\": \"Biochemical assay of isolated UBL domain added to purified 26S proteasomes; comparison with Usp14-knockout proteasomes; cell-based protein degradation assays using UBL-domain expression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with purified isolated domain plus multiple enzymatic assays; single lab but rigorous mechanistic dissection\",\n      \"pmids\": [\"30487212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 directly interacts with and deubiquitinates androgen receptor (AR), stabilizing AR protein by removing its ubiquitin chain. Inhibition or knockdown of USP14 accelerates K48-linked ubiquitination and proteasome-mediated degradation of AR in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays; cycloheximide chase; pharmacological and siRNA inhibition of USP14\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus ubiquitination assays and proteasome inhibitor rescue; single lab, two orthogonal methods\",\n      \"pmids\": [\"29353883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 interacts with RNF168 (via RNF168's MIU1 domain) and directly deubiquitinates it in vitro; USP14 is itself a substrate of autophagy (interacting with MAP1LC3B and the UBA domain of SQSTM1/p62). USP14 antagonizes RNF168-dependent ubiquitin signaling and downstream 53BP1 chromatin recruitment at DNA double-strand breaks.\",\n      \"method\": \"Co-immunoprecipitation; colocalization by immunofluorescence; in vitro deubiquitination assay; autophagy substrate assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro deubiquitination assay plus reciprocal Co-IP and domain mapping; single lab\",\n      \"pmids\": [\"29995557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 directly interacts with and stabilizes FASN (fatty acid synthase) by deubiquitination; USP14 overexpression promotes liver triglyceride accumulation in mice, while genetic ablation or pharmacological inhibition of USP14 ameliorates hepatosteatosis, hyperglycemia and insulin resistance in obese mice.\",\n      \"method\": \"Proteome, ubiquitinome and interactome analysis; Co-immunoprecipitation; in vivo mouse models (overexpression and knockout); IU1 pharmacological inhibition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteome-wide substrate screening combined with Co-IP validation and in vivo genetic/pharmacological experiments; multiple orthogonal methods\",\n      \"pmids\": [\"30425250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM11 binds both the proteasome and USP14, precluding their association, thereby relieving USP14-mediated noncatalytic inhibition of the proteasome and increasing overall proteasome activity and protein degradation.\",\n      \"method\": \"Co-immunoprecipitation; in vitro proteasome activity assays; knockdown/overexpression experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP demonstrating TRIM11-USP14-proteasome interactions combined with functional activity assays; single lab\",\n      \"pmids\": [\"29581427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 promotes K48-linked ubiquitination and proteasome-mediated degradation of IκBα by removing its ubiquitin chain, thereby promoting NF-κB activation. USP14 was found to associate with RelA, which acts as a linker between USP14 and IκBα. LPS treatment induces serine phosphorylation of USP14.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; cycloheximide chase; Western blot; cytokine ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with functional assays; single lab; consistent results across multiple readouts but mechanistic evidence is indirect\",\n      \"pmids\": [\"23615914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 promotes mitophagy independently of PINK1 and Parkin by triggering mitochondrial fragmentation and membrane rupture that exposes the LC3 receptor Prohibitin 2; genetic and pharmacological inhibition of USP14 corrects mitochondrial dysfunction and locomotion defects in PINK1/Parkin mutant Drosophila.\",\n      \"method\": \"Genetic and pharmacological (IU1) USP14 inhibition in cell lines and Drosophila PD model; LC3/Prohibitin 2 localization; mitochondrial morphology assays; behavior tests\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo Drosophila genetic model with locomotion readout plus cell biological mechanistic dissection; single lab\",\n      \"pmids\": [\"30249595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP14 directly interacts with CXCR4 or its C-terminus in a CXCL12-stimulated, time-dependent manner; USP14 catalyzes CXCR4 deubiquitination. Knockdown of USP14 blocks deubiquitination and CXCR4 degradation, while overexpression promotes deubiquitination. Both overexpression and knockdown of USP14 block CXCL12-mediated chemotaxis, indicating that a ubiquitination-deubiquitination cycle on CXCR4 is required for chemotaxis. ERK activation is independent of CXCR4 ubiquitination status.\",\n      \"method\": \"Co-immunoprecipitation; co-localization by immunofluorescence; RNAi knockdown; ubiquitination assays; chemotaxis assays; use of ubiquitination-deficient CXCR4 mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with functional knockdown, mutant rescue and chemotaxis assays; single lab\",\n      \"pmids\": [\"19106094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP14 stabilizes CBP (CREB-binding protein) via deubiquitination, thereby enhancing glucagon action and hepatic gluconeogenesis. ER stress upregulates USP14 expression; liver-specific USP14 knockdown abrogates ER stress-induced effects on glucose metabolism and improves hyperglycemia in obese mice.\",\n      \"method\": \"In vivo hepatic USP14 overexpression and knockdown; ubiquitination assays; Co-immunoprecipitation; glucose tolerance tests in obese mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo liver-specific knockdown with metabolic readouts plus ubiquitination assays; single lab but multiple methods\",\n      \"pmids\": [\"31594848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP14 interacts with the chaperone HSC70 in neuroblastoma cells; proteasome inhibition enhances USP14-HSC70 binding and also promotes interaction with XBP1u and IRE1α (UPR components). Inhibition of HSC70 downregulates USP14, and proteasome inhibition or W58A-USP14 (proteasome-binding mutant) promotes USP14 interaction with GABARAP, increasing autophagosomes.\",\n      \"method\": \"MS-based interactomics; co-immunoprecipitation; pharmacological HSC70 inhibition; fluorescence microscopy of autophagosomes\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — MS interactome plus Co-IP validation and functional imaging; single lab\",\n      \"pmids\": [\"31901637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP14 inhibition (via IU1 inhibitor or siRNA) impairs autophagic flux specifically at the autophagosome-lysosome fusion step, with UVRAG as a checkpoint. This indicates USP14 activity has opposing roles in the two major proteolytic pathways: its inhibition enhances proteasomal activity but simultaneously blocks autophagic flux.\",\n      \"method\": \"Autophagy flux assays (LC3 lipidation, p62 accumulation); lysosomal fusion assays; USP14 pharmacological inhibition and siRNA; UVRAG functional analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple autophagy flux readouts with pharmacological and genetic perturbation; single lab\",\n      \"pmids\": [\"30021169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP14 is a deubiquitinase for Ku70; mass spectrometry identified USP14 interaction with Ku70 and other NHEJ proteins, and an in vitro assay confirmed USP14 directly deubiquitinates Ku70. AKT-mediated Ser432 phosphorylation of USP14 is required for its DSB recruitment (IRIF formation). USP14 negatively regulates NHEJ in autophagy- and PTEN-deficient cells.\",\n      \"method\": \"Mass spectrometry; co-immunoprecipitation; in vitro deubiquitination assay; NHEJ reporter assay; immunofluorescence IRIF formation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro deubiquitination assay plus MS and Co-IP; AKT phosphorylation identified; single lab with multiple methods\",\n      \"pmids\": [\"31740976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP14 directly deubiquitinates K63-linked ubiquitin chains on RIG-I; USP14 knockdown enhances RIG-I-triggered type I IFN signaling and inhibits VSV replication, while overexpression attenuates IFN-β expression, identifying USP14 as a negative regulator of antiviral immunity.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K63-linkage specific); siRNA knockdown; viral replication assays; in vivo mouse experiments with IU1\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with K63-linkage-specific ubiquitination assay plus functional viral/IFN assays; single lab\",\n      \"pmids\": [\"30466171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"High-resolution cryo-EM of human USP14 bound to the 26S proteasome in 13 distinct conformational states revealed: ubiquitin-dependent activation of USP14 allosterically reprograms the AAA-ATPase motor conformation and stimulates core particle gate opening; dynamic USP14-ATPase interactions decouple ATPase activity from RPN11 deubiquitination; USP14 introduces three regulatory checkpoints at ubiquitin recognition, substrate translocation initiation, and ubiquitin chain recycling steps.\",\n      \"method\": \"Time-resolved single-particle cryo-EM; conformational state classification of proteasome intermediates during degradation of polyubiquitylated proteins\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution time-resolved cryo-EM capturing 13 states during active substrate processing; most rigorous structural mechanism study to date\",\n      \"pmids\": [\"35477760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of yeast proteasome bound to Ubp6 identified an ILR element within the BL1 loop that mediates Rpt1 interaction to activate Ubp6; mutations in the ILR element abrogate both Ubp6 activation and its noncatalytic proteasome inhibition, demonstrating these two functions are mechanistically linked via the same interface. Ubp6 and ubiquitin together drive the proteasome into a unique inhibited conformation.\",\n      \"method\": \"Single-particle cryo-EM; site-directed mutagenesis of Ubp6 and Rpt1; biochemical activity assays with mutants\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structures plus mutagenesis with functional validation; multiple orthogonal methods in single study\",\n      \"pmids\": [\"35149681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 directly deubiquitinates IDO1 via its deubiquitinase activity, stabilizing the IDO1 protein; knockdown or inhibition of USP14 decreases IDO1 expression, reverses T-cell suppression, and increases responsiveness to anti-PD-1 therapy in a syngeneic mouse model.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; knockdown and pharmacological inhibition of USP14; in vivo syngeneic mouse model (MC38)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with ubiquitination assays plus in vivo model; single lab, two orthogonal methods\",\n      \"pmids\": [\"36163134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 catalyzes K48-linked deubiquitination of TAZ, promoting TAZ stabilization; TAZ in turn facilitates transcription of USP14 by binding TEAD1/4 response elements in the USP14 promoter, creating a self-amplifying feedback loop. USP14 does not stabilize the TAZ paralog YAP.\",\n      \"method\": \"DUB library screening; Co-immunoprecipitation; ubiquitination assays (K48-linkage specific); ChIP/luciferase reporter assays; in vivo xenograft and liver metastasis models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — unbiased DUB screen followed by ubiquitination assays and transcriptional reporter assays; in vivo validation; single lab\",\n      \"pmids\": [\"35906484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Usp14 controls ciliogenesis, cilia elongation, and Hedgehog (Hh) signal transduction in mammalian cells; pharmacological inhibition of Usp14 positively affects Hh signaling in a polycystic kidney disease model.\",\n      \"method\": \"Usp14 knockdown and pharmacological inhibition; cilia length measurements by immunofluorescence; Hh signaling reporter assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pharmacological and genetic inhibition with multiple cellular readouts; single lab\",\n      \"pmids\": [\"30388222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"USP14 interacts with and deubiquitinates vimentin, stabilizing it in gastric cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP plus deubiquitination assay; single lab, limited mechanistic depth\",\n      \"pmids\": [\"27448976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"USP14 associates with and stabilizes Aurora kinase B by preventing its FBXW7-mediated ubiquitination and degradation; USP14 overexpression inhibits chemotherapy drug-induced apoptosis in leukemia cells.\",\n      \"method\": \"Co-immunoprecipitation; cycloheximide chase; deubiquitination assay; flow cytometry apoptosis assays\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with deubiquitination assay; single lab, single publication\",\n      \"pmids\": [\"28662510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP14 interacts with and deubiquitinates CyclinB1, preventing its APC/C-mediated degradation; USP14 knockdown increases CyclinB1 ubiquitination and arrests cells at G2/M phase in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; flow cytometry cell cycle analysis; USP14 siRNA knockdown\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP plus ubiquitination assay; single lab, limited mechanistic rigor\",\n      \"pmids\": [\"31474315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 interacts with and stabilizes CDK1 by deubiquitinating K48-linked ubiquitin chains; USP14 inhibition causes G2/M cell cycle arrest in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K48-linkage specific); flow cytometry; siRNA knockdown\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab\",\n      \"pmids\": [\"36604147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP14 interacts with and stabilizes JNK by deubiquitination; USP14 ablation reduces JNK protein levels and MAPK/JNK pathway activation, suppressing colorectal tumorigenesis in vitro and in vivo. TNF-α induces USP14 expression, forming a positive feedback loop with JNK.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; RNA-seq and luciferase reporter pathway analysis; in vivo colorectal tumor models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model; single lab\",\n      \"pmids\": [\"36693850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP14 deubiquitinates IκBα (removing K48-linked ubiquitin) and binds both IκBα and RELA, reducing IκBα stability and thereby promoting NF-κB activation and IκBα degradation in HNSCC cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K48-linkage specific); NF-κB reporter assay; nuclear fractionation; pharmacological and genetic USP14 inhibition\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with linkage-specific ubiquitination assay and reporter assays; in vivo xenograft validation; single lab\",\n      \"pmids\": [\"37055579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP14 deubiquitinates and stabilizes NLRP3; USP14 knockdown induces NLRP3 ubiquitination and inhibits pyroptosis of annulus fibrosus cells, while USP14 overexpression promotes pyroptosis through NLRP3/Caspase-1/IL-1β signaling.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; flow cytometry (pyroptosis); ELISA (IL-1β, IL-18); gain/loss-of-function experiments\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab, single publication\",\n      \"pmids\": [\"36514221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 deubiquitinates and stabilizes SIRT1 in macrophages, promoting fatty acid oxidation and M2/immunosuppressive macrophage polarization in the tumor microenvironment.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; FAO (fatty acid oxidation) assays; OCR measurement; IU1 inhibition in tumor-bearing mice\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay and metabolic readouts; single lab\",\n      \"pmids\": [\"36701891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP14 deubiquitinates HSP90AA1 (reducing K48-linked ubiquitination), stabilizing it; elevated HSP90AA1 in turn promotes CYP2E1 protein accumulation, driving NAFLD progression through oxidative stress and mitochondrial dysfunction.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; in vivo mouse models; hepatocyte-specific USP14 overexpression and knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with ubiquitination assay and in vivo validation; mechanistic chain demonstrated; single lab\",\n      \"pmids\": [\"37633951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IFNα increases TRIM14 transcription, which recruits USP14 to remove K63-linked ubiquitin chains from PD-L1, thereby preventing p62-mediated recognition and autophagic degradation of PD-L1, leading to immune evasion.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K63-linkage specific); autophagy flux assays; in vivo tumor models with IU1 + IFNα + anti-CTLA4 combination\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with ubiquitination assay and in vivo model; single lab but multiple methods and in vivo validation\",\n      \"pmids\": [\"38424493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP14 stabilizes the m6A demethylase ALKBH5 by preventing its K48-linked ubiquitination and degradation (mediated by HECW2); MST4 kinase phosphorylates ALKBH5 at Ser64/69, increasing its interaction with USP14 and promoting deubiquitylation. ALKBH5 in turn interacts with the USP14 transcript in a YTHDF2-dependent manner to sustain USP14 overexpression, forming a positive feedback loop that promotes glioblastoma stem cell radioresistance.\",\n      \"method\": \"Mass spectrometry; co-immunoprecipitation; ubiquitination assay; phosphorylation mapping; m6A-seq; transcriptome analysis; in vivo xenograft models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS with Co-IP and ubiquitination assays plus in vivo xenograft model; multiple orthogonal methods; single lab\",\n      \"pmids\": [\"39990235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP14 directly binds ubiquitin chains on viral VP16 protein through its UBL domain; USP14 inactivation triggers EIF2AK3/PERK- and ERN1/IRE1-mediated ER stress, which drives K63-linked ubiquitination of VP16 and its degradation via SQSTM1/p62-mediated selective autophagy, inhibiting alphaherpesvirus replication.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; ER stress pathway analysis; USP14 null cell rescue; CRISPR knockout; in vivo mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with ubiquitination assays and in vivo validation; single lab but multiple methods\",\n      \"pmids\": [\"34822318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 interacts with, deubiquitinates, and stabilizes MFG-E8 in human bronchial epithelial cells, inhibiting its proteasomal degradation; cigarette smoke reduces USP14 expression, decreasing MFG-E8 abundance and antiferroptotic protection.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; siRNA knockdown; Western blot\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab\",\n      \"pmids\": [\"36596780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP14 directly binds TRAF6 and blocks the USP14-TRAF6 interaction; USP14 inhibition (via compound S5) promotes K63-linked ubiquitination of Beclin1, disrupts Beclin1-Bcl2 interaction, and promotes autophagosome accumulation in M1 macrophages, blocking M1 polarization and alleviating sepsis in CLP mice.\",\n      \"method\": \"Molecular docking; Co-immunoprecipitation; ubiquitination assay; autophagy flux assays; in vivo CLP mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model but molecular docking-led discovery; single lab\",\n      \"pmids\": [\"32820146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALDH2 reduces the interaction between USP14 and cGAS, promoting K48-linked polyubiquitination and degradation of cGAS at lysine 282 in macrophages; USP14 knockdown in bone marrow cells alleviated proinflammatory responses and protected against atherosclerosis.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K48-linkage, site-specific); bone marrow transplantation; in vivo atherosclerosis model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with site-specific ubiquitination assay and in vivo bone marrow transplant model; single lab\",\n      \"pmids\": [\"39178733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP14 deubiquitinates and stabilizes NLRC5; USP14 overexpression in endothelial cells restrains ox-LDL-stimulated NF-κB activation by protecting NLRC5 from degradation, and USP14 adenoviral overexpression in ApoE−/− mice reduces atherosclerotic lesions.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; in vivo ApoE−/− mouse model with adenoviral USP14 overexpression; NF-κB reporter assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay and in vivo model; single lab\",\n      \"pmids\": [\"36372300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GSTM3 stabilizes USP14, which in turn inhibits ubiquitination and degradation of FASN, leading to ferroptosis promotion in NPC under ionizing radiation.\",\n      \"method\": \"Co-immunoprecipitation; mass spectrometry; immunofluorescence; ubiquitination assay\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP with ubiquitination assay; single lab\",\n      \"pmids\": [\"38228715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Inactive USP14 C114A mutant (requiring intact proteasome-binding domain) causes accumulation of specific ubiquitinated proteins at the proteasome, including β-catenin, which does not accumulate with inactive UCHL5 C88A, demonstrating substrate selectivity between the two proteasome-associated DUBs. USP14 also regulates deubiquitination of proteasomal subunits PSMC1 and PSMD4.\",\n      \"method\": \"USP14 C114A inactive mutant expression; ubiquitin immunoprecipitation; mass spectrometry; immunoprecipitation/immunoblotting validation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteasome-binding mutant combined with MS-based proteomics and biochemical validation; single lab but multiple substrates confirmed\",\n      \"pmids\": [\"31703099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Ubp6 processes Lys11 and Lys63 polyubiquitin chains with increasing efficiency as chain length increases, and shows endo-chain cleavage preference for K48-linked chains (in contrast to Rpn11's random cleavage). Proteasomes deconjugate ubiquitin substrates ~100-fold more efficiently than constituent DUBs alone; incorporation into proteasomes significantly enhances Rpn11 catalytic efficiency.\",\n      \"method\": \"In vitro deubiquitination assays with defined homogeneous and heterogeneous polyubiquitin conjugates; fluorescently labeled Ub chain substrates; kinetic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined substrates; rigorous kinetic analysis; multiple chain types compared\",\n      \"pmids\": [\"25389291\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USP14 (yeast Ubp6) is a proteasome-associated cysteine deubiquitinase that binds the 19S regulatory particle base via its N-terminal UBL domain (to Rpn1) and exists in an autoinhibited conformation blocked by BL1/BL2 loops; interaction with Rpt1 (ILR element) and ubiquitin-chain binding relieves autoinhibition and activates catalysis, whereupon USP14 preferentially removes ubiquitin chains en bloc from multi-site ubiquitinated substrates on a millisecond timescale, reducing substrate dwell time and antagonizing degradation, while also allosterically inhibiting multiple proteasome activities (peptidase, ATPase, Rpn11) in the absence of substrate through a noncatalytic mechanism; upon ubiquitin chain engagement, USP14 allosterically reprograms the ATPase motor conformation, stimulates core particle gate opening, and introduces three substrate-editing checkpoints; beyond the proteasome, USP14 stabilizes numerous cellular substrates (AR, IDO1, FASN, TAZ, JNK, CDK1, CyclinB1, SIRT1, NLRP3, Ku70, and others) by direct deubiquitination, regulates Wnt/Dishevelled and RIG-I antiviral signaling, controls synaptic vesicle number and NMJ development through a catalysis-independent function, promotes mitophagy via Prohibitin-2 exposure, and maintains cellular free ubiquitin pools, collectively explaining its roles in neurodegenerative disease, cancer, metabolism, and immunity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"USP14 is a proteasome-associated cysteine deubiquitinase that controls the entry of ubiquitinated substrates into the 26S proteasome and broadly stabilizes specific cellular proteins by removing their ubiquitin chains [#1, #2, #13]. Its catalytic domain is held in an autoinhibited state by two surface loops (BL1/BL2) that occlude the active site until ubiquitin binding displaces them, positioning the ubiquitin C-terminus for hydrolysis [#0]. USP14 docks onto the 19S regulatory particle base via its N-terminal UBL domain, which binds Rpn1, while its catalytic USP domain bridges Rpn1 and Rpt1 and is positioned near the ATPase ring mouth and Rpn11 upon ubiquitin engagement [#12, #30]. Functionally it acts on two registers: in the absence of substrate it allosterically inhibits proteasome peptidase, ATPase, and Rpn11 activities through a noncatalytic mechanism, whereas upon engaging multi-site ubiquitinated substrates it removes chains en bloc on a millisecond timescale, reducing substrate dwell time and rejecting substrates before degradation commits [#6, #13, #14]; time-resolved cryo-EM shows ubiquitin-dependent USP14 activation reprograms the ATPase motor, stimulates gate opening, and imposes regulatory checkpoints during translocation [#29]. Both the activating and inhibitory functions converge on the same Rpt1-binding interface (the ILR element within BL1), mechanistically linking catalysis and allosteric inhibition [#30]. USP14 also recycles ubiquitin to maintain cellular free ubiquitin pools, loss of which causes neuromuscular junction and synaptic transmission defects in mice [#3, #5, #8], and it independently controls synaptic vesicle number and short-term plasticity through a catalysis-independent function [#4, #11]. Beyond the proteasome, USP14 stabilizes diverse substrates by direct deubiquitination — including the androgen receptor, FASN, IDO1, TAZ, and Ku70 — and regulates Wnt/Dishevelled and RIG-I antiviral signaling, with roles spanning DNA repair, metabolism, immunity, and cancer [#13, #17, #19, #27, #28, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing whether the USP14 ortholog is itself a functional protease defined the gene as a ubiquitin-specific cysteine protease rather than a structural adaptor.\",\n      \"evidence\": \"in vitro enzymatic assays with purified yeast Ubp6 and radiolabeled ubiquitin substrates\",\n      \"pmids\": [\"9344467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not place the enzyme at the proteasome\", \"Chain-length and linkage preferences not yet resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linking USP14 loss to a defined physiological phenotype showed the enzyme regulates synaptic transmission in vivo, separating its organismal role from gross protein turnover.\",\n      \"evidence\": \"positional cloning, in vitro deubiquitination, and electrophysiology in ax(J) mice\",\n      \"pmids\": [\"12368914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reported inability to process polyubiquitin chains conflicted with later proteasome-context findings\", \"Molecular target at the synapse unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Positioning Ubp6 in the proteasome base and showing it maintains free ubiquitin pools defined USP14 as a proteasome-associated DUB acting alongside Rpn11.\",\n      \"evidence\": \"proteasome purification from deletion mutants, genetic double-mutant lethality, fluorescence localization, and ubiquitin-overexpression suppression in yeast\",\n      \"pmids\": [\"14581483\", \"14559899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing Ubp6 and Rpn11 deubiquitination not yet defined\", \"Structural basis of proteasome docking unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Atomic structures revealed how USP14 catalysis is gated, explaining ubiquitin-induced activation, while mammalian fractionation confirmed conservation of its ubiquitin-recycling role.\",\n      \"evidence\": \"X-ray crystallography of free enzyme and ubiquitin-aldehyde complex; proteasome co-fractionation and free-ubiquitin quantitation in ax(J) mice\",\n      \"pmids\": [\"16211010\", \"16190881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of the full proteasome-bound enzyme not yet available\", \"Did not address allosteric effects on the proteasome\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Distinguishing catalytic from noncatalytic activity showed USP14 can delay degradation independent of deubiquitination, revealing a dual-mode regulator of the proteasome.\",\n      \"evidence\": \"in vitro and cell-based degradation assays with catalytic-dead Ubp6 and comparison to Rpn11\",\n      \"pmids\": [\"17018280\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of noncatalytic inhibition undefined\", \"Physiological substrates of the timing effect unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating a role in 19S assembly added a developmental dimension to USP14 beyond steady-state regulation.\",\n      \"evidence\": \"native mass spectrometry of intact proteasomes and ubp6/hsm3 genetic epistasis in yeast\",\n      \"pmids\": [\"21658604\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the assembly role is conserved in mammals not tested here\", \"Catalytic vs noncatalytic contribution to assembly not fully separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining chain-type and chain-length preferences clarified how USP14 cleaves polyubiquitin differently from Rpn11 and how proteasome incorporation boosts overall deconjugation.\",\n      \"evidence\": \"in vitro kinetic deubiquitination assays with defined homo- and heterogeneous polyubiquitin conjugates\",\n      \"pmids\": [\"25389291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Behavior on physiological multi-chain substrates not directly addressed\", \"Single-molecule kinetics on the proteasome not measured here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing preference for multi-site ubiquitinated substrates with en bloc, millisecond chain removal established USP14's substrate-rejection role as a degradation checkpoint.\",\n      \"evidence\": \"in vitro reconstitution with defined cyclin B conjugates and single-molecule fluorescence, with yeast-human conservation tests\",\n      \"pmids\": [\"27074503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural intermediates during chain removal not captured\", \"How rejection is coordinated with translocation unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Cryo-EM placed the UBL on Rpn1 and the USP domain bridging Rpn1-Rpt1, explaining how USP14 binding drives a kinetically distinct proteasome conformation.\",\n      \"evidence\": \"single-particle cryo-EM with cross-linking mass spectrometry of yeast proteasome-Ubp6\",\n      \"pmids\": [\"26130806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational dynamics during active substrate processing not resolved at this stage\", \"Activation interface not yet mutationally mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Quantifying allosteric inhibition of multiple proteasome activities and substrate-driven recruitment cycling defined USP14 as a substrate-gated brake on the proteasome.\",\n      \"evidence\": \"enzymatic comparison of Usp14-knockout vs wild-type proteasomes with catalytic-dead reconstitution; native co-IP and recombinant-protein binding with inhibitor experiments\",\n      \"pmids\": [\"28416611\", \"28396413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The interface responsible for noncatalytic inhibition not yet identified\", \"Co-cycling with Ube3c functionally underexplored\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Isolating the UBL domain showed it alone stimulates the very activities full-length USP14 inhibits, dissecting domain-specific opposing effects on the proteasome.\",\n      \"evidence\": \"addition of purified isolated UBL domain to 26S proteasomes with multiple enzymatic and cell-based degradation assays\",\n      \"pmids\": [\"30487212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the catalytic domain overrides UBL stimulation in the full enzyme not fully resolved\", \"In vivo relevance of UBL-only stimulation unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying direct substrates (AR, FASN) and a regulator (TRIM11) extended USP14 from a proteasome modulator to a stabilizer of disease-relevant proteins.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, cycloheximide chase, and in vivo mouse metabolic and oncologic models\",\n      \"pmids\": [\"29353883\", \"30425250\", \"29581427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs proteasome-context deubiquitination not always disentangled\", \"Reciprocal validation of some interactions limited to single labs\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Comparing inactive USP14 and UCHL5 mutants demonstrated substrate selectivity among proteasome-associated DUBs and identified accumulating targets including beta-catenin.\",\n      \"evidence\": \"expression of catalytically dead USP14 C114A, ubiquitin immunoprecipitation, and mass spectrometry\",\n      \"pmids\": [\"31703099\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis for DUB substrate selectivity unresolved\", \"Direct vs indirect substrate accumulation not fully separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"High-resolution time-resolved cryo-EM and ILR-element mutagenesis revealed how ubiquitin-dependent activation reprograms the ATPase motor and mechanistically links activation with noncatalytic inhibition.\",\n      \"evidence\": \"time-resolved single-particle cryo-EM across 13 proteasome states; cryo-EM with site-directed mutagenesis of the Ubp6 ILR element and Rpt1\",\n      \"pmids\": [\"35477760\", \"35149681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the three checkpoints are regulated in cells not established\", \"Whether human-specific regulators modulate these states unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A broad panel of substrate-stabilization studies (IDO1, TAZ, Ku70, RIG-I, NLRP3 and others) mapped USP14's reach into immunity, DNA repair, signaling, and metabolism.\",\n      \"evidence\": \"Co-IP, linkage-specific ubiquitination assays, and in vivo tumor, immune, and metabolic models across multiple labs\",\n      \"pmids\": [\"31740976\", \"30466171\", \"36163134\", \"35906484\", \"37055579\", \"37633951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Many substrates rest on single-lab Co-IP/ubiquitination assays without reciprocal or structural validation\", \"Whether stabilization occurs at the proteasome or independently is often unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How USP14's proteasome-gating function is integrated with its many reported free-standing substrate-stabilization roles, and which of those substrates reflect direct catalysis versus proteasome-context effects, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying framework distinguishing on-proteasome vs off-proteasome deubiquitination\", \"Most disease substrates lack structural or reconstituted-enzyme confirmation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 13, 17, 19, 27, 51, 52]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [1, 13, 52]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 14, 16, 30]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [44]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0000502\", \"supporting_discovery_ids\": [2, 3, 5, 12, 14, 29]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 18, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 6, 13, 14, 29]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [13, 52]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [22, 26, 45]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 28, 33]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [28, 43, 48]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [18, 27]}\n    ],\n    \"complexes\": [\"26S proteasome\", \"19S regulatory particle\"],\n    \"partners\": [\"RPN1\", \"RPT1\", \"RPN11\", \"IRE1A\", \"RNF168\", \"RELA\", \"TRIM11\", \"HSC70\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}