{"gene":"PSMD3","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1997,"finding":"The yeast protein Sun2p (523 amino acids) was identified as the homologue of the human 26S proteasome p58 subunit (PSMD3). Sun2p co-migrated with known proteasome components in glycerol density gradient centrifugation, establishing it as a component of the regulatory module of the yeast 26S proteasome. Furthermore, expression of a truncated Sun2p lacking the N-terminal 150 amino acids rescued the null sun2 phenotype, indicating the N-terminal domain is dispensable for core proteasome function in yeast.","method":"Glycerol density gradient centrifugation, multicopy suppressor screen of nin1-1 temperature-sensitive mutant, complementation assays with truncation mutants, cDNA cloning","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic suppression screen plus biochemical co-sedimentation with proteasome, multiple orthogonal approaches in one study","pmids":["9017604"],"is_preprint":false},{"year":1999,"finding":"Conditional inactivation of yeast Rpn3 (the PSMD3 orthologue) by temperature-sensitive alleles caused metaphase arrest and severely impaired ubiquitin-dependent proteolysis of multiple cell-cycle regulatory substrates: the G1 cyclin Cln2 (targeted by SCF), the S-phase cyclin Clb5, the B-type cyclin Clb2, and the anaphase inhibitor Pds1 (APC/C targets). Strikingly, the CDK inhibitor Sic1 was still degraded normally in rpn3 mutants, while Sic1 turnover was blocked by rpn12/nin1 mutations, demonstrating that distinct 19S regulatory particle (RP) non-ATPase subunits are required for the ubiquitin-dependent proteolysis of specific substrates.","method":"Temperature-sensitive alleles of rpn3, pulse-chase and cycloheximide-chase proteolysis assays for multiple substrates, flow cytometry for cell-cycle arrest phenotype","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — genetic epistasis with multiple substrate readouts, orthogonal methods, rigorous controls including comparison with rpn12 mutants","pmids":["10490625"],"is_preprint":false},{"year":2011,"finding":"Yeast Rpn3 (PSMD3 orthologue) physically interacts strongly with the proteasome-associated deubiquitinating enzyme Rpn11. In rpn3 mutants, Rpn11 is destabilized and fails to be recruited into mature 26S proteasomes, resulting in strongly reduced association between 20S catalytic and 19S regulatory particles, accumulation of multi-ubiquitinated proteins on the shuttle factor Rad23, and stabilization of proteolytic substrates. Depleting Rpn11 in an rpn3 mutant background caused synthetic growth and proteolytic defects, establishing that Rpn11 stability is dependent on its incorporation into proteasomes facilitated by Rpn3.","method":"Co-immunoprecipitation between 19S subunits, glycerol gradient fractionation of proteasome particles, pulse-chase stability assays for Rpn11, epistasis analysis of rpn3 × rpn11 depletion","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus biochemical fractionation, multiple orthogonal readouts in one study","pmids":["21619884"],"is_preprint":false},{"year":2019,"finding":"Human PSMD3 (Proteasome 26S Subunit Non-ATPase 3) physically interacts with HER2 at the protein level in breast cancer cells, as demonstrated by co-immunoprecipitation. Knockdown of PSMD3 significantly destabilized HER2 protein and strongly enhanced its ubiquitination, while accumulation of the lysosomal marker LAMP-1 at the cell membrane accompanied decreased HER2 immunostaining, suggesting PSMD3 protects HER2 from ubiquitin-mediated lysosomal degradation. PSMD3 knockdown inhibited BC cell proliferation, colony formation, and induced apoptosis.","method":"Co-immunoprecipitation of PSMD3 and HER2, siRNA knockdown of PSMD3, ubiquitination assay, LAMP-1 localization by immunostaining, colony formation and apoptosis assays","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP plus functional knockdown with multiple readouts, single lab","pmids":["31013812"],"is_preprint":false},{"year":2021,"finding":"PSMD3 and PSMD1, both non-ATPase subunits of the 19S regulatory complex of the 26S proteasome, promote NF-κB protein expression and nuclear NF-κB activity in chronic myeloid leukemia (CML) cells. Knockdown of PSMD3 reduced NF-κB activity as measured by luciferase reporter and immunoblot, and reduced survival of CML cells but not normal cord blood CD34+ progenitors. STAT3 was found to further activate NF-κB in TKI-resistant CML, and PSMD3 levels were markedly higher in blast-phase versus chronic-phase CML patients.","method":"siRNA knockdown of PSMD3, luciferase NF-κB reporter assays, nucleocytoplasmic fractionation, immunoblot for NF-κB components, cell viability and apoptosis assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — functional knockdown with reporter and fractionation assays, single lab, multiple orthogonal readouts","pmids":["33712704"],"is_preprint":false},{"year":1996,"finding":"The 26S proteasome 19S regulatory complex (RC/PA700) is composed of multiple ATPase and non-ATPase subunits. The non-ATPase subunits (including p58/PSMD3) are essential components of the base and lid subcomplexes of the 19S particle; together with ATPase subunits they mediate recognition of ubiquitinated substrates and control access to the 20S catalytic core. This comprehensive review synthesized biochemical reconstitution, subunit fractionation, and cross-linking studies that collectively defined the subunit composition and functional organization of the 26S proteasome.","method":"Biochemical fractionation, reconstitution of 26S from 20S and 19S particles, cross-linking, subunit purification and characterization (review of primary experimental data)","journal":"Annual review of biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 — foundational review synthesizing multiple reconstitution and fractionation experiments, >2000 citations reflecting broad replication","pmids":["8811196"],"is_preprint":false},{"year":2009,"finding":"PSMD3 (p58, RPN3) is identified as a stable component of the human 19S regulatory particle of the 26S proteasome through proteomic interaction network analysis. The 19S RP non-ATPase subunits, including PSMD3, form the 'lid' subcomplex that is required for ubiquitin chain recognition and deubiquitination during substrate processing, and PSMD3 physically associates with the deubiquitinating enzyme USP14 and other proteasome-associated DUBs as part of the proteasome machinery.","method":"Tandem affinity purification mass spectrometry (TAP-MS) of deubiquitinating enzymes and associated complexes, CompPASS confidence scoring","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale AP-MS proteomic study identifying PSMD3 within the 19S proteasome complex, single methodology but high-confidence scoring","pmids":["19615732"],"is_preprint":false}],"current_model":"PSMD3 (p58/RPN3/Sun2p) is a non-ATPase subunit of the 19S regulatory particle lid subcomplex of the 26S proteasome that is required for assembly and stability of the proteasome (by recruiting and stabilizing the deubiquitinase RPN11/PSMD14), mediates ubiquitin-dependent proteolysis of specific cell-cycle regulators (cyclins Cln2, Clb2, Clb5; anaphase inhibitor Pds1) in a substrate-selective manner, stabilizes client oncoproteins such as HER2 from ubiquitin-mediated degradation, and promotes NF-κB activity in cancer cells."},"narrative":{"teleology":[{"year":1996,"claim":"Biochemical reconstitution and fractionation studies established the subunit composition of the 26S proteasome 19S regulatory particle, placing p58/PSMD3 among the non-ATPase subunits that constitute the lid and base subcomplexes required for ubiquitinated substrate recognition and gating of the 20S core.","evidence":"Biochemical fractionation, reconstitution of 26S from 20S and 19S particles, cross-linking, and subunit purification (review of primary data)","pmids":["8811196"],"confidence":"High","gaps":["Specific functional contribution of p58/PSMD3 versus other non-ATPase subunits was not resolved","No substrate-level analysis of p58 requirement"]},{"year":1997,"claim":"Identification of the yeast orthologue Sun2p/Rpn3 and its biochemical co-sedimentation with proteasome components confirmed PSMD3 as a bona fide 26S proteasome subunit and showed that the N-terminal 150 amino acids are dispensable for core proteasome function.","evidence":"Glycerol density gradient centrifugation, multicopy suppressor screen, complementation with truncation mutants in yeast","pmids":["9017604"],"confidence":"High","gaps":["Role of the dispensable N-terminal domain remained undefined","Whether Rpn3 contributes to proteolysis of specific substrates was untested"]},{"year":1999,"claim":"Conditional inactivation of Rpn3 revealed that this lid subunit is selectively required for ubiquitin-dependent degradation of specific cell-cycle substrates (Cln2, Clb5, Clb2, Pds1) but not Sic1, establishing that individual 19S non-ATPase subunits confer substrate selectivity to the proteasome.","evidence":"Temperature-sensitive rpn3 alleles, pulse-chase and cycloheximide-chase proteolysis assays, flow cytometry for cell-cycle arrest, comparison with rpn12 mutants in yeast","pmids":["10490625"],"confidence":"High","gaps":["Molecular basis of substrate selectivity — whether Rpn3 contacts substrates directly or acts indirectly — was not determined","Generalizability to mammalian proteasomes was not tested"]},{"year":2009,"claim":"Proteomic mapping of the human deubiquitinase interaction network confirmed PSMD3 as a stable lid subunit of the human 19S regulatory particle and revealed its physical association with proteasome-associated deubiquitinases including USP14.","evidence":"Tandem affinity purification mass spectrometry (TAP-MS) with CompPASS confidence scoring in human cells","pmids":["19615732"],"confidence":"Medium","gaps":["Direct versus indirect nature of the PSMD3–USP14 association was not resolved","Functional consequence of this interaction was not tested"]},{"year":2011,"claim":"Rpn3 was shown to physically interact with the deubiquitinase Rpn11 and to be required for Rpn11 stability and incorporation into mature 26S proteasomes, explaining how Rpn3 loss leads to defective 20S–19S association and polyubiquitin accumulation.","evidence":"Co-immunoprecipitation, glycerol gradient fractionation, pulse-chase Rpn11 stability assays, rpn3 × rpn11 synthetic epistasis in yeast","pmids":["21619884"],"confidence":"High","gaps":["Structural basis of the Rpn3–Rpn11 interface was not resolved","Whether this mechanism is conserved in the human PSMD3–PSMD14 pair was not directly demonstrated"]},{"year":2019,"claim":"A non-canonical, proteasome-external role for human PSMD3 was proposed: PSMD3 physically interacts with HER2 and shields it from ubiquitin-mediated lysosomal degradation in breast cancer cells, with knockdown reducing HER2 levels and impairing cancer cell viability.","evidence":"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, LAMP-1 localization by immunostaining, colony formation and apoptosis assays in breast cancer cell lines","pmids":["31013812"],"confidence":"Medium","gaps":["Whether PSMD3 acts on HER2 as part of the intact 26S proteasome or independently was not distinguished","Single-lab observation without independent replication","Direct binding domain on PSMD3 or HER2 was not mapped"]},{"year":2021,"claim":"PSMD3 was linked to NF-κB activation in CML cells, with knockdown reducing NF-κB protein levels, nuclear activity, and leukemic cell survival while sparing normal progenitors, suggesting a disease-relevant signaling role for this proteasome subunit.","evidence":"siRNA knockdown, NF-κB luciferase reporter, nucleocytoplasmic fractionation, immunoblot, cell viability and apoptosis assays in CML cell lines and patient samples","pmids":["33712704"],"confidence":"Medium","gaps":["Whether PSMD3 promotes NF-κB via proteasomal IκB degradation or a distinct mechanism was not resolved","Single-lab study; independent validation needed","Relationship between the HER2-stabilizing and NF-κB-activating roles is unknown"]},{"year":null,"claim":"The structural basis of PSMD3's substrate-selective contribution to proteasomal degradation, the mechanism by which it stabilizes RPN11/PSMD14 during lid assembly, and whether its reported non-canonical roles in HER2 stabilization and NF-κB activation reflect proteasome-dependent or independent functions remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of PSMD3 in context of the human 19S lid with bound substrate","Proteasome-dependent versus proteasome-independent mechanisms for HER2 and NF-κB effects not distinguished","In vivo relevance of PSMD3 substrate selectivity in mammalian systems not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,5,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,6]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2,5,6]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1]}],"complexes":["26S proteasome","19S regulatory particle lid"],"partners":["PSMD14","HER2","USP14","PSMD1"],"other_free_text":[]},"mechanistic_narrative":"PSMD3 is a non-ATPase subunit of the 19S regulatory particle lid subcomplex of the 26S proteasome, essential for proteasome assembly, substrate-selective ubiquitin-dependent proteolysis, and stabilization of the proteasome-associated deubiquitinase RPN11/PSMD14. Conditional inactivation of its yeast orthologue Rpn3 impairs degradation of specific cell-cycle regulators (cyclins Cln2, Clb5, Clb2 and the anaphase inhibitor Pds1) while sparing others such as Sic1, demonstrating that individual lid subunits confer substrate selectivity to the proteasome [PMID:10490625]. PSMD3 physically interacts with and is required for the stability and proteasomal incorporation of the deubiquitinase Rpn11; loss of Rpn3 causes accumulation of polyubiquitinated proteins and defective 20S–19S particle association [PMID:21619884]. In human cancer cells, PSMD3 stabilizes HER2 by shielding it from ubiquitin-mediated lysosomal degradation and promotes NF-κB activity, linking proteasome subunit function to oncogenic signaling [PMID:31013812, PMID:33712704]."},"prefetch_data":{"uniprot":{"accession":"O43242","full_name":"26S proteasome non-ATPase regulatory subunit 3","aliases":["26S proteasome regulatory subunit RPN3","26S proteasome regulatory subunit S3","Proteasome subunit p58"],"length_aa":534,"mass_kda":61.0,"function":"Component of the 26S proteasome, a multiprotein complex involved in the ATP-dependent degradation of ubiquitinated proteins. This complex plays a key role in the maintenance of protein homeostasis by removing misfolded or damaged proteins, which could impair cellular functions, and by removing proteins whose functions are no longer required. Therefore, the proteasome participates in numerous cellular processes, including cell cycle progression, apoptosis, or DNA damage repair","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O43242/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PSMD3","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000108344","cell_line_id":"CID000119","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"PSMA1","stoichiometry":10.0},{"gene":"PSMA2","stoichiometry":10.0},{"gene":"PSMA3","stoichiometry":10.0},{"gene":"PSMA4","stoichiometry":10.0},{"gene":"PSMA6","stoichiometry":10.0},{"gene":"PSMB1","stoichiometry":10.0},{"gene":"PSMB2","stoichiometry":10.0},{"gene":"PSMB3","stoichiometry":10.0},{"gene":"PSMB4","stoichiometry":10.0},{"gene":"PSMB5","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000119","total_profiled":1310},"omim":[{"mim_id":"617858","title":"PROTEASOME INHIBITOR SUBUNIT 1; PSMF1","url":"https://www.omim.org/entry/617858"},{"mim_id":"617676","title":"PROTEASOME 26S SUBUNIT, NON-ATPase, 3; PSMD3","url":"https://www.omim.org/entry/617676"},{"mim_id":"610935","title":"ZINC-ACTIVATED ION CHANNEL; ZACN","url":"https://www.omim.org/entry/610935"},{"mim_id":"312180","title":"UBIQUITIN-CONJUGATING ENZYME E2 A; UBE2A","url":"https://www.omim.org/entry/312180"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":242.1}],"url":"https://www.proteinatlas.org/search/PSMD3"},"hgnc":{"alias_symbol":["S3","P58","Rpn3"],"prev_symbol":["TSTA2"]},"alphafold":{"accession":"O43242","domains":[{"cath_id":"-","chopping":"69-138_159-222","consensus_level":"medium","plddt":71.7555,"start":69,"end":222},{"cath_id":"1.10.10.10","chopping":"415-467","consensus_level":"high","plddt":84.8902,"start":415,"end":467}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43242","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43242-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43242-F1-predicted_aligned_error_v6.png","plddt_mean":72.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PSMD3","jax_strain_url":"https://www.jax.org/strain/search?query=PSMD3"},"sequence":{"accession":"O43242","fasta_url":"https://rest.uniprot.org/uniprotkb/O43242.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43242/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43242"}},"corpus_meta":[{"pmid":"8340759","id":"PMC_8340759","title":"P58 molecules as putative receptors for major histocompatibility complex (MHC) class I molecules in human natural killer (NK) cells. 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depolarization.","date":"2013","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/23503661","citation_count":870,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32296183","id":"PMC_32296183","title":"A reference map of the human binary protein interactome.","date":"2020","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/32296183","citation_count":849,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14743216","id":"PMC_14743216","title":"A physical and functional map of the human TNF-alpha/NF-kappa B signal transduction pathway.","date":"2004","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14743216","citation_count":841,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29507755","id":"PMC_29507755","title":"VIRMA mediates preferential m6A mRNA methylation in 3'UTR and near stop codon and associates with alternative polyadenylation.","date":"2018","source":"Cell discovery","url":"https://pubmed.ncbi.nlm.nih.gov/29507755","citation_count":829,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14528300","id":"PMC_14528300","title":"The antiretroviral enzyme APOBEC3G is degraded by the proteasome in response to HIV-1 Vif.","date":"2003","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/14528300","citation_count":798,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12859895","id":"PMC_12859895","title":"Species-specific exclusion of APOBEC3G from HIV-1 virions by Vif.","date":"2003","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/12859895","citation_count":763,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14702039","id":"PMC_14702039","title":"Complete sequencing and characterization of 21,243 full-length human cDNAs.","date":"2003","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/14702039","citation_count":754,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17353931","id":"PMC_17353931","title":"Large-scale mapping of human protein-protein interactions by mass spectrometry.","date":"2007","source":"Molecular systems biology","url":"https://pubmed.ncbi.nlm.nih.gov/17353931","citation_count":733,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33961781","id":"PMC_33961781","title":"Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.","date":"2021","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/33961781","citation_count":705,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22939629","id":"PMC_22939629","title":"A census of human soluble protein complexes.","date":"2012","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/22939629","citation_count":689,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14528301","id":"PMC_14528301","title":"HIV-1 Vif protein binds the editing enzyme APOBEC3G and induces its degradation.","date":"2003","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/14528301","citation_count":679,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14527406","id":"PMC_14527406","title":"HIV-1 Vif blocks the antiviral activity of APOBEC3G by impairing both its translation and intracellular stability.","date":"2003","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/14527406","citation_count":607,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19056867","id":"PMC_19056867","title":"Large-scale proteomics and phosphoproteomics of urinary exosomes.","date":"2008","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/19056867","citation_count":607,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12750511","id":"PMC_12750511","title":"Hypermutation of HIV-1 DNA in the absence of the Vif protein.","date":"2003","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/12750511","citation_count":570,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28302793","id":"PMC_28302793","title":"Anticancer sulfonamides target splicing by inducing RBM39 degradation via recruitment to DCAF15.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/28302793","citation_count":533,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46590,"output_tokens":1702,"usd":0.08265},"stage2":{"model":"claude-opus-4-6","input_tokens":4645,"output_tokens":1759,"usd":0.1008},"total_usd":0.444682,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":57745,"output_tokens":5588,"usd":0.128527},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5909,"output_tokens":2357,"usd":0.132705}},"stage1_raw":"Looking through these abstracts for mechanistic findings about PSMD3 (Proteasome 26S Subunit, Non-ATPase 3), I need to identify papers specifically about this protein.\n\nPSMD3 is the p58 subunit of the human 26S proteasome 19S regulatory particle. I need to distinguish this from the many other \"p58\" and \"S3\" proteins in the corpus (NK cell receptors, DNA primase subunit, CDK11 isoform, ribosomal protein S3, ERGIC-53 lectin, lamin B receptor, etc.).\n\nThe relevant papers are:\n- PMID 9017604: Yeast counterparts of S5a and p58(S3) of human 26S proteasome\n- PMID 10490625: rpn3 (yeast ortholog of PSMD3) functional characterization\n- PMID 31013812: PSMD3 stabilizes HER2 from degradation in breast cancer\n- PMID 33712704: PSMD1 and PSMD3 stabilize NF-κB in CML\n- PMID 21619884: Rpn3 (yeast ortholog) interactions with Rpn11 and proteasome assembly\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"PSMD3 (p58 subunit of the human 26S proteasome) was cloned and identified as a component of the 19S regulatory particle; its yeast ortholog Sun2p co-migrates with known proteasome components in glycerol density gradient centrifugation, and an N-terminal truncation of p58 (lacking the first 150 amino acids) rescued the null allele of the yeast SUN2 gene, establishing that the C-terminal region is functionally sufficient for 26S proteasome integration.\",\n      \"method\": \"Glycerol density gradient centrifugation, complementation of yeast null mutant with truncated human p58 cDNA, co-migration with proteasome components\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic complementation and biochemical co-fractionation in single study; yeast ortholog work provides functional insight into domain requirements\",\n      \"pmids\": [\"9017604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rpn3/Sun2 (yeast ortholog of PSMD3) is an essential non-ATPase subunit of the 19S regulatory particle required for ubiquitin-dependent proteolysis of multiple cell cycle substrates (Cln2, Clb5, Clb2, Pds1); conditional inactivation of rpn3 causes metaphase arrest, indicating that Rpn3 function is specifically limiting for mitotic progression through APC/C-dependent substrate degradation.\",\n      \"method\": \"Temperature-sensitive mutant alleles, in vivo protein half-life assays, genetic epistasis with cell cycle regulators\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ts mutants, substrate half-life, cell cycle phenotype) establishing pathway position; strong mechanistic detail\",\n      \"pmids\": [\"10490625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rpn3 (yeast PSMD3 ortholog) directly binds Rpn11 (a proteasome-associated deubiquitinase); loss of Rpn3 function destabilizes Rpn11 and reduces assembly of intact 26S proteasomes (reduced 20S–19S association), leading to accumulation of multi-ubiquitinated substrates and impaired proteolysis.\",\n      \"method\": \"Co-immunoprecipitation, proteasome integrity assays (native gel/sucrose gradient), substrate stabilization assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding and functional consequence shown; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21619884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human PSMD3 physically interacts with HER2 protein and protects it from ubiquitin-mediated degradation; knockdown of PSMD3 in HER2+ breast cancer cells markedly enhanced HER2 ubiquitination, reduced HER2 protein levels, and caused redistribution of the lysosomal marker LAMP-1 to the cell membrane, indicating routing of HER2 for lysosomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, immunofluorescence for LAMP-1, cell proliferation and apoptosis assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct protein interaction confirmed by co-IP with functional ubiquitination readout; single lab study\",\n      \"pmids\": [\"31013812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PSMD3 (and PSMD1), as components of the 19S regulatory complex, promote NF-κB protein expression and nuclear activity in chronic myeloid leukemia cells; knockdown of PSMD3 reduced NF-κB activity as measured by luciferase reporter and immunoblot, and induced apoptosis selectively in CML cells but not normal CD34+ progenitors.\",\n      \"method\": \"shRNA/siRNA knockdown, luciferase NF-κB reporter assay, nucleocytoplasmic fractionation, immunoblot for NF-κB subunits, apoptosis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional readouts (reporter, fractionation, protein levels) in single lab; pathway placement via NF-κB established\",\n      \"pmids\": [\"33712704\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PSMD3 is a non-ATPase subunit of the 19S regulatory particle of the 26S proteasome that is required for efficient ubiquitin-dependent proteolysis of cell cycle regulators (including APC/C substrates) and NF-κB pathway components; it stabilizes the deubiquitinase Rpn11/PSMD14 within the proteasome, and in cancer cells it directly associates with HER2 to protect it from ubiquitin-mediated degradation, thereby promoting NF-κB activity and cell survival.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification of retrieved papers (first 100):**\n\n- Papers [1],[2],[10],[12],[14],[29],[50]: p58 = NK cell KIR receptor → EXCLUDE (alias collision)\n- Paper [3]: RPS3 (ribosomal protein S3) as NF-κB subunit → EXCLUDE (different gene, RPS3)\n- Paper [4]: S3-12 adipocyte protein → EXCLUDE (alias collision)\n- Paper [5]: HeLa S3 cell line transcriptome → EXCLUDE (cell line name, not PSMD3)\n- Paper [6]: S3 dermatology guidelines → EXCLUDE\n- Paper [7]: p58 pre-Golgi compartment marker → EXCLUDE (different p58)\n- Paper [8]: Melanoma S3 guideline → EXCLUDE\n- Paper [9]: Adipocyte S3-12 protein → EXCLUDE\n- Paper [11]: Ribosomal protein S3 DNA repair → EXCLUDE (RPS3)\n- Paper [13]: HeLa S3 nuclear matrix → EXCLUDE (cell line)\n- Paper [15]: HeLa S3 nuclear matrix → EXCLUDE (cell line)\n- Paper [16]: RPS3 bacterial effector → EXCLUDE (RPS3)\n- Paper [17]: p58(IPK)/DNAJC3 → EXCLUDE (different p58)\n- Paper [18]: P58/DNAJc3 ER chaperone → EXCLUDE (different p58)\n- Paper [19]: p58 DNA primase subunit → EXCLUDE (DNA primase p58)\n- Paper [20]: S3 photosystem II → EXCLUDE\n- Paper [21]: HeLa S3 karyotype → EXCLUDE (cell line)\n- Paper [22]: S3 calcium channel → EXCLUDE\n- Paper [23]: S3-S3' HIV protease subsites → EXCLUDE\n- **Paper [24]: Yeast counterparts of S5a and p58(S3) of human 26S proteasome → KEEP** (directly about PSMD3/p58 subunit of 26S proteasome)\n- Paper [25]: Drosophila RPS3 → EXCLUDE (RPS3)\n- Paper [26]: p58(Ctf13) yeast kinetochore → EXCLUDE (different p58)\n- Paper [27]: p58/lamin B receptor → EXCLUDE (different p58)\n- Paper [28]: HeLa S3 radiation → EXCLUDE (cell line)\n- Paper [29]: p58 KIR crystal structure → EXCLUDE (NK receptor)\n- Paper [30]: p58 DNA primase subunit → EXCLUDE\n- Paper [31]: CDK11(p58) → EXCLUDE (CDK11 isoform)\n- Paper [32]: p58(PITSLRE)/CDK11 → EXCLUDE (CDK11)\n- Paper [33]: RPS3 mitochondrial DNA → EXCLUDE (RPS3)\n- Paper [34]: Cyclin B1 HeLa S3 → EXCLUDE (cell line)\n- Paper [35]: RPS3 eukaryotic review → EXCLUDE (RPS3)\n- Paper [36]: S3 antimicrobial peptide → EXCLUDE\n- Paper [37]: S3-state photosystem II → EXCLUDE\n- Paper [38]: RPS3 40S subunit assembly → EXCLUDE (RPS3)\n- Paper [39]: D2 mRNA S3 proximal tubule → EXCLUDE\n- Paper [40]: Ribosomal protein S3 Manduca sexta → EXCLUDE (RPS3)\n- Paper [41]: RPS3 multifunctional review → EXCLUDE (RPS3)\n- Paper [42]: p58.2 KIR NK cells → EXCLUDE (KIR)\n- Paper [43]: Drosophila RPS3 → EXCLUDE (RPS3)\n- Paper [44]: Pyocin S3 → EXCLUDE\n- Paper [45]: Cathepsin K S3 subsite → EXCLUDE\n- Paper [46]: RPS3 translocation ERK → EXCLUDE (RPS3)\n- Paper [47]: RPS3 invasion → EXCLUDE (RPS3)\n- Paper [48]: p58 DNA primase → EXCLUDE\n- Paper [49]: RPS3 osteosarcoma → EXCLUDE (RPS3)\n- Paper [50]: p58 KIR NK cells → EXCLUDE\n- **Paper [55]: PSMD3 regulates HER2 stability in breast cancer → KEEP**\n- **Paper [56]: rpn3/SUN2 yeast (Rpn3 = PSMD3 ortholog) cell cycle → KEEP**\n- Paper [57]: RPS3 apoptosis/TRADD → EXCLUDE (RPS3)\n- Paper [58]: Yeast RPS3 AP endonuclease → EXCLUDE (RPS3)\n- Paper [59]: Babesia p58 merozoite → EXCLUDE\n- Paper [60]: p58(IPK) inflammasome → EXCLUDE (different p58)\n- Paper [61]: RPS3 UV skin → EXCLUDE (RPS3)\n- **Paper [62]: PSMD1 and PSMD3 in CML, NF-κB → KEEP**\n- Paper [63]: RPS3 ERK phosphorylation → EXCLUDE (RPS3)\n- Paper [64]: RPS3 knockdown genotoxic → EXCLUDE (RPS3)\n- Paper [65]: CDK11(p58) centriole → EXCLUDE (CDK11)\n- Paper [66]: Sea urchin P58-A/B skeletogenesis → EXCLUDE\n- Paper [67]: Reovirus S3 gene → EXCLUDE\n- Paper [68]: HeLa S3 theophylline → EXCLUDE (cell line)\n- Paper [69]: Xenopus p58/lamin B receptor → EXCLUDE (different p58)\n- Paper [70]: HeLa S3 glucocorticoid → EXCLUDE (cell line)\n- Paper [71]: HLA-A2 Flu p58-66 peptide → EXCLUDE\n- Paper [72]: P58(TFL) zinc finger → EXCLUDE (different p58)\n- Paper [73]: p58 pre-Golgi COPI/COPII → EXCLUDE (different p58, ERGIC-53)\n- Paper [74]: Avian reovirus S3 → EXCLUDE\n- Paper [75]: RPS3 colon cancer p53 → EXCLUDE (RPS3)\n- Paper [76]: HeLa S3 cucurbitacins → EXCLUDE (cell line)\n- Paper [77]: S3 guideline atopic dermatitis → EXCLUDE\n- Paper [78]: Yeast RPS3 β-lyase → EXCLUDE (RPS3)\n- Paper [79]: p58 ERGIC-53/MR60 oligomerization → EXCLUDE (different p58)\n- Paper [80]: RPS3 Cdk1 phosphorylation → EXCLUDE (RPS3)\n- Paper [81]: CDK11(p58) IRES PTB → EXCLUDE (CDK11)\n- Paper [82]: P58(IPK) crystal structure → EXCLUDE (different p58)\n- Paper [83]: RPS3 TFIIH NER → EXCLUDE (RPS3)\n- Paper [84]: RPS3 IκBα → EXCLUDE (RPS3)\n- Paper [85]: Clostridium S3 cellulosomal → EXCLUDE\n- Paper [86]: RPS3 sumoylation → EXCLUDE (RPS3)\n- Paper [87]: CDK11(p58) HBO1 → EXCLUDE (CDK11)\n- Paper [88]: RPS3 lung injury → EXCLUDE (RPS3)\n- Paper [89]: RPS3 myeloma drug resistance → EXCLUDE (RPS3)\n- Paper [90]: RPS3 glycosylation → EXCLUDE (RPS3)\n- Paper [91]: HeLa S3 duocarmycin → EXCLUDE (cell line)\n- Paper [92]: E. coli RPS3/H protein → EXCLUDE (RPS3)\n- Paper [93]: P58(IPK) crystal structure → EXCLUDE (different p58)\n- Paper [94]: RPS3 RECQL4 helicase → EXCLUDE (RPS3)\n- Paper [95]: RPS3 ischemia neuroprotection → EXCLUDE (RPS3)\n- Paper [96]: HOXB7-S3 breast cancer siRNA → EXCLUDE (HOXB7 siRNA named S3)\n- Paper [97]: HIV-2 RT p68/p58 heterodimer → EXCLUDE (HIV RT)\n- Paper [98]: Yeast rpn3 mutants proteasome assembly → KEEP (Rpn3 = yeast PSMD3 ortholog)\n- Paper [99]: CDK11(p58) autophosphorylation → EXCLUDE (CDK11)\n- Paper [100]: P58(IPK) pathway modeling → EXCLUDE\n\n**Classification of gene2pubmed-curated papers:**\n\n- Paper [1] (PMID:8811196): Structure and functions of 20S and 26S proteasomes → KEEP (foundational review covering 19S/26S proteasome including PSMD3 context)\n- Paper [2] (PMID:12167863): HIV-1 Vif/APOBEC3G → EXCLUDE (not about PSMD3)\n- Paper [3] (PMID:22658674): mRNA-binding proteins (RBP interactome) → EXCLUDE (PSMD3 not central)\n- Paper [4] (PMID:12477932): MGC cDNA sequences → EXCLUDE (genomics, no mechanism)\n- Paper [5] (PMID:19489727): Recognition and processing of ubiquitin-protein conjugates by proteasome → KEEP (covers 19S RP including non-ATPase subunits)\n- Paper [6] (PMID:19615732): Dub interaction landscape (CompPASS) → KEEP (PSMD3 as part of 19S proteasome interaction network)\n- Paper [7] (PMID:14564014): Vif-Cul5-SCF APOBEC3G → EXCLUDE\n- Paper [8] (PMID:25416956): Human interactome map → EXCLUDE (no PSMD3-specific mechanism)\n- Paper [9] (PMID:26186194): BioPlex network → EXCLUDE (no PSMD3-specific mechanism)\n- Paper [10] (PMID:26496610): Human interactome quantitative → EXCLUDE\n- Paper [11] (PMID:12808466): APOBEC3G → EXCLUDE\n- Paper [12] (PMID:12809610): APOBEC3G → EXCLUDE\n- Paper [13] (PMID:33961781): BioPlex 3.0 → EXCLUDE\n- Paper [14] (PMID:22939629): Human protein complexes → EXCLUDE\n- Paper [15] (PMID:23503661): PARKIN ubiquitylome → EXCLUDE\n- Paper [16] (PMID:32296183): Human binary interactome HuRI → EXCLUDE\n- Paper [17] (PMID:14743216): TNF-α/NF-κB pathway mapping → KEEP (PSMD3 identified as interactor in NF-κB pathway)\n- Paper [18] (PMID:29507755): VIRMA m6A methylation → EXCLUDE\n- Paper [19] (PMID:14528300): APOBEC3G degradation → EXCLUDE\n- Paper [20] (PMID:12859895): APOBEC3G/Vif → EXCLUDE\n- Paper [21] (PMID:14702039): Full-length human cDNAs → EXCLUDE\n- Paper [22] (PMID:17353931): Large-scale protein-protein interactions mass spec → EXCLUDE (no PSMD3-specific mechanism)\n- Paper [23] (PMID:33961781): BioPlex 3.0 (duplicate) → EXCLUDE\n- Paper [24] (PMID:22939629): Census of human soluble protein complexes (duplicate) → EXCLUDE\n- Paper [25] (PMID:14527406): Vif/APOBEC3G → EXCLUDE\n- Paper [26] (PMID:21873635): GO phylogenetic → EXCLUDE\n- Paper [27] (PMID:14527406): Vif/APOBEC3G → EXCLUDE\n- Paper [28] (PMID:19056867): Urinary exosomes proteomics → EXCLUDE\n- Paper [29] (PMID:12750511): APOBEC3G → EXCLUDE\n- Paper [30] (PMID:28302793): Indisulam/RBM39/DCAF15 → EXCLUDE\n\nNow extracting discoveries from KEPT papers: [24], [55], [56], [62], [98], and curated [1], [5], [6], [17].\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"The yeast protein Sun2p (523 amino acids) was identified as the homologue of the human 26S proteasome p58 subunit (PSMD3). Sun2p co-migrated with known proteasome components in glycerol density gradient centrifugation, establishing it as a component of the regulatory module of the yeast 26S proteasome. Furthermore, expression of a truncated Sun2p lacking the N-terminal 150 amino acids rescued the null sun2 phenotype, indicating the N-terminal domain is dispensable for core proteasome function in yeast.\",\n      \"method\": \"Glycerol density gradient centrifugation, multicopy suppressor screen of nin1-1 temperature-sensitive mutant, complementation assays with truncation mutants, cDNA cloning\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic suppression screen plus biochemical co-sedimentation with proteasome, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"9017604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Conditional inactivation of yeast Rpn3 (the PSMD3 orthologue) by temperature-sensitive alleles caused metaphase arrest and severely impaired ubiquitin-dependent proteolysis of multiple cell-cycle regulatory substrates: the G1 cyclin Cln2 (targeted by SCF), the S-phase cyclin Clb5, the B-type cyclin Clb2, and the anaphase inhibitor Pds1 (APC/C targets). Strikingly, the CDK inhibitor Sic1 was still degraded normally in rpn3 mutants, while Sic1 turnover was blocked by rpn12/nin1 mutations, demonstrating that distinct 19S regulatory particle (RP) non-ATPase subunits are required for the ubiquitin-dependent proteolysis of specific substrates.\",\n      \"method\": \"Temperature-sensitive alleles of rpn3, pulse-chase and cycloheximide-chase proteolysis assays for multiple substrates, flow cytometry for cell-cycle arrest phenotype\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic epistasis with multiple substrate readouts, orthogonal methods, rigorous controls including comparison with rpn12 mutants\",\n      \"pmids\": [\"10490625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Yeast Rpn3 (PSMD3 orthologue) physically interacts strongly with the proteasome-associated deubiquitinating enzyme Rpn11. In rpn3 mutants, Rpn11 is destabilized and fails to be recruited into mature 26S proteasomes, resulting in strongly reduced association between 20S catalytic and 19S regulatory particles, accumulation of multi-ubiquitinated proteins on the shuttle factor Rad23, and stabilization of proteolytic substrates. Depleting Rpn11 in an rpn3 mutant background caused synthetic growth and proteolytic defects, establishing that Rpn11 stability is dependent on its incorporation into proteasomes facilitated by Rpn3.\",\n      \"method\": \"Co-immunoprecipitation between 19S subunits, glycerol gradient fractionation of proteasome particles, pulse-chase stability assays for Rpn11, epistasis analysis of rpn3 × rpn11 depletion\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus biochemical fractionation, multiple orthogonal readouts in one study\",\n      \"pmids\": [\"21619884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human PSMD3 (Proteasome 26S Subunit Non-ATPase 3) physically interacts with HER2 at the protein level in breast cancer cells, as demonstrated by co-immunoprecipitation. Knockdown of PSMD3 significantly destabilized HER2 protein and strongly enhanced its ubiquitination, while accumulation of the lysosomal marker LAMP-1 at the cell membrane accompanied decreased HER2 immunostaining, suggesting PSMD3 protects HER2 from ubiquitin-mediated lysosomal degradation. PSMD3 knockdown inhibited BC cell proliferation, colony formation, and induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation of PSMD3 and HER2, siRNA knockdown of PSMD3, ubiquitination assay, LAMP-1 localization by immunostaining, colony formation and apoptosis assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP plus functional knockdown with multiple readouts, single lab\",\n      \"pmids\": [\"31013812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PSMD3 and PSMD1, both non-ATPase subunits of the 19S regulatory complex of the 26S proteasome, promote NF-κB protein expression and nuclear NF-κB activity in chronic myeloid leukemia (CML) cells. Knockdown of PSMD3 reduced NF-κB activity as measured by luciferase reporter and immunoblot, and reduced survival of CML cells but not normal cord blood CD34+ progenitors. STAT3 was found to further activate NF-κB in TKI-resistant CML, and PSMD3 levels were markedly higher in blast-phase versus chronic-phase CML patients.\",\n      \"method\": \"siRNA knockdown of PSMD3, luciferase NF-κB reporter assays, nucleocytoplasmic fractionation, immunoblot for NF-κB components, cell viability and apoptosis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — functional knockdown with reporter and fractionation assays, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"33712704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The 26S proteasome 19S regulatory complex (RC/PA700) is composed of multiple ATPase and non-ATPase subunits. The non-ATPase subunits (including p58/PSMD3) are essential components of the base and lid subcomplexes of the 19S particle; together with ATPase subunits they mediate recognition of ubiquitinated substrates and control access to the 20S catalytic core. This comprehensive review synthesized biochemical reconstitution, subunit fractionation, and cross-linking studies that collectively defined the subunit composition and functional organization of the 26S proteasome.\",\n      \"method\": \"Biochemical fractionation, reconstitution of 26S from 20S and 19S particles, cross-linking, subunit purification and characterization (review of primary experimental data)\",\n      \"journal\": \"Annual review of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — foundational review synthesizing multiple reconstitution and fractionation experiments, >2000 citations reflecting broad replication\",\n      \"pmids\": [\"8811196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PSMD3 (p58, RPN3) is identified as a stable component of the human 19S regulatory particle of the 26S proteasome through proteomic interaction network analysis. The 19S RP non-ATPase subunits, including PSMD3, form the 'lid' subcomplex that is required for ubiquitin chain recognition and deubiquitination during substrate processing, and PSMD3 physically associates with the deubiquitinating enzyme USP14 and other proteasome-associated DUBs as part of the proteasome machinery.\",\n      \"method\": \"Tandem affinity purification mass spectrometry (TAP-MS) of deubiquitinating enzymes and associated complexes, CompPASS confidence scoring\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale AP-MS proteomic study identifying PSMD3 within the 19S proteasome complex, single methodology but high-confidence scoring\",\n      \"pmids\": [\"19615732\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PSMD3 (p58/RPN3/Sun2p) is a non-ATPase subunit of the 19S regulatory particle lid subcomplex of the 26S proteasome that is required for assembly and stability of the proteasome (by recruiting and stabilizing the deubiquitinase RPN11/PSMD14), mediates ubiquitin-dependent proteolysis of specific cell-cycle regulators (cyclins Cln2, Clb2, Clb5; anaphase inhibitor Pds1) in a substrate-selective manner, stabilizes client oncoproteins such as HER2 from ubiquitin-mediated degradation, and promotes NF-κB activity in cancer cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PSMD3 is a non-ATPase subunit of the 19S regulatory particle of the 26S proteasome, essential for ubiquitin-dependent proteolysis of cell cycle regulators and signaling pathway components. Its C-terminal region is sufficient for incorporation into the 26S proteasome, and it directly binds and stabilizes the deubiquitinase Rpn11/PSMD14, thereby maintaining proteasome integrity and efficient substrate degradation [PMID:9017604, PMID:21619884]. Conditional loss of PSMD3/Rpn3 function causes accumulation of multi-ubiquitinated substrates, stabilization of APC/C-dependent cell cycle regulators, and metaphase arrest [PMID:10490625]. In cancer cells, PSMD3 physically associates with HER2 and protects it from ubiquitin-mediated lysosomal degradation, and promotes NF-κB nuclear activity, linking proteasome function to oncogenic signaling and cell survival [PMID:31013812, PMID:33712704].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that PSMD3 is a bona fide 19S regulatory particle subunit answered the basic question of where this protein functions within the proteasome, and showed that its C-terminal domain is sufficient for integration.\",\n      \"evidence\": \"Glycerol density gradient co-fractionation with proteasome components and complementation of yeast SUN2 null with truncated human p58 cDNA\",\n      \"pmids\": [\"9017604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural resolution of how the C-terminal domain contacts adjacent 19S subunits\",\n        \"Human proteasome integration was inferred from yeast complementation, not demonstrated directly in human cells\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that Rpn3/PSMD3 is essential for degradation of multiple APC/C substrates and mitotic progression established that it is not merely structural but rate-limiting for specific proteolytic events during the cell cycle.\",\n      \"evidence\": \"Temperature-sensitive rpn3 mutant alleles in yeast with in vivo half-life assays for Cln2, Clb5, Clb2, and Pds1; cell cycle arrest phenotyping\",\n      \"pmids\": [\"10490625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PSMD3 makes a substrate-specific contribution versus a general proteasome integrity contribution was not resolved\",\n        \"Mammalian cell cycle phenotypes upon PSMD3 loss were not tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying Rpn3 as a direct binding partner and stabilizer of the deubiquitinase Rpn11 explained how its loss impairs 26S proteasome assembly and causes accumulation of polyubiquitinated proteins.\",\n      \"evidence\": \"Co-immunoprecipitation of Rpn3–Rpn11, native gel and sucrose gradient proteasome integrity assays, substrate stabilization readouts in yeast\",\n      \"pmids\": [\"21619884\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Structural basis of the Rpn3–Rpn11 interaction remains undefined\",\n        \"Whether Rpn3 has additional roles beyond Rpn11 stabilization (e.g., ubiquitin receptor coordination) is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing that PSMD3 physically interacts with HER2 and shields it from ubiquitin-mediated degradation revealed an unexpected proteasome-subunit-level regulatory interaction with an oncogenic receptor tyrosine kinase.\",\n      \"evidence\": \"Co-immunoprecipitation in HER2+ breast cancer cell lines, siRNA knockdown with ubiquitination assays and LAMP-1 immunofluorescence\",\n      \"pmids\": [\"31013812\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PSMD3–HER2 binding occurs within or outside the assembled 26S proteasome is unknown\",\n        \"Reciprocal IP from HER2 side pulling down endogenous PSMD3 was not independently replicated\",\n        \"The domain on PSMD3 mediating HER2 interaction was not mapped\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that PSMD3 knockdown reduces NF-κB nuclear activity and induces selective apoptosis in CML cells connected its proteasome function to a specific oncogenic signaling pathway and highlighted therapeutic potential.\",\n      \"evidence\": \"shRNA/siRNA knockdown with NF-κB luciferase reporter, nucleocytoplasmic fractionation, immunoblot for NF-κB subunits, apoptosis assays in CML cells versus normal CD34+ progenitors\",\n      \"pmids\": [\"33712704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the NF-κB effect is mediated through canonical IκBα degradation by the proteasome or through a distinct PSMD3-specific mechanism was not dissected\",\n        \"In vivo validation in animal models is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown whether PSMD3 contributes substrate-specific selectivity to the proteasome beyond its structural/Rpn11-stabilizing role, and the molecular basis for its proteasome-independent interactions (e.g., with HER2) is uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of PSMD3 in complex with Rpn11 or HER2\",\n        \"Whether PSMD3 functions outside the assembled 26S proteasome in physiological contexts is untested\",\n        \"Mammalian genetic knockout models have not been characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\n      \"26S proteasome (19S regulatory particle)\"\n    ],\n    \"partners\": [\n      \"PSMD14\",\n      \"ERBB2\",\n      \"PSMD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"PSMD3 is a non-ATPase subunit of the 19S regulatory particle lid subcomplex of the 26S proteasome, essential for proteasome assembly, substrate-selective ubiquitin-dependent proteolysis, and stabilization of the proteasome-associated deubiquitinase RPN11/PSMD14. Conditional inactivation of its yeast orthologue Rpn3 impairs degradation of specific cell-cycle regulators (cyclins Cln2, Clb5, Clb2 and the anaphase inhibitor Pds1) while sparing others such as Sic1, demonstrating that individual lid subunits confer substrate selectivity to the proteasome [PMID:10490625]. PSMD3 physically interacts with and is required for the stability and proteasomal incorporation of the deubiquitinase Rpn11; loss of Rpn3 causes accumulation of polyubiquitinated proteins and defective 20S–19S particle association [PMID:21619884]. In human cancer cells, PSMD3 stabilizes HER2 by shielding it from ubiquitin-mediated lysosomal degradation and promotes NF-κB activity, linking proteasome subunit function to oncogenic signaling [PMID:31013812, PMID:33712704].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Biochemical reconstitution and fractionation studies established the subunit composition of the 26S proteasome 19S regulatory particle, placing p58/PSMD3 among the non-ATPase subunits that constitute the lid and base subcomplexes required for ubiquitinated substrate recognition and gating of the 20S core.\",\n      \"evidence\": \"Biochemical fractionation, reconstitution of 26S from 20S and 19S particles, cross-linking, and subunit purification (review of primary data)\",\n      \"pmids\": [\"8811196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific functional contribution of p58/PSMD3 versus other non-ATPase subunits was not resolved\",\n        \"No substrate-level analysis of p58 requirement\"\n      ]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of the yeast orthologue Sun2p/Rpn3 and its biochemical co-sedimentation with proteasome components confirmed PSMD3 as a bona fide 26S proteasome subunit and showed that the N-terminal 150 amino acids are dispensable for core proteasome function.\",\n      \"evidence\": \"Glycerol density gradient centrifugation, multicopy suppressor screen, complementation with truncation mutants in yeast\",\n      \"pmids\": [\"9017604\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Role of the dispensable N-terminal domain remained undefined\",\n        \"Whether Rpn3 contributes to proteolysis of specific substrates was untested\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Conditional inactivation of Rpn3 revealed that this lid subunit is selectively required for ubiquitin-dependent degradation of specific cell-cycle substrates (Cln2, Clb5, Clb2, Pds1) but not Sic1, establishing that individual 19S non-ATPase subunits confer substrate selectivity to the proteasome.\",\n      \"evidence\": \"Temperature-sensitive rpn3 alleles, pulse-chase and cycloheximide-chase proteolysis assays, flow cytometry for cell-cycle arrest, comparison with rpn12 mutants in yeast\",\n      \"pmids\": [\"10490625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular basis of substrate selectivity — whether Rpn3 contacts substrates directly or acts indirectly — was not determined\",\n        \"Generalizability to mammalian proteasomes was not tested\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Proteomic mapping of the human deubiquitinase interaction network confirmed PSMD3 as a stable lid subunit of the human 19S regulatory particle and revealed its physical association with proteasome-associated deubiquitinases including USP14.\",\n      \"evidence\": \"Tandem affinity purification mass spectrometry (TAP-MS) with CompPASS confidence scoring in human cells\",\n      \"pmids\": [\"19615732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct versus indirect nature of the PSMD3–USP14 association was not resolved\",\n        \"Functional consequence of this interaction was not tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Rpn3 was shown to physically interact with the deubiquitinase Rpn11 and to be required for Rpn11 stability and incorporation into mature 26S proteasomes, explaining how Rpn3 loss leads to defective 20S–19S association and polyubiquitin accumulation.\",\n      \"evidence\": \"Co-immunoprecipitation, glycerol gradient fractionation, pulse-chase Rpn11 stability assays, rpn3 × rpn11 synthetic epistasis in yeast\",\n      \"pmids\": [\"21619884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the Rpn3–Rpn11 interface was not resolved\",\n        \"Whether this mechanism is conserved in the human PSMD3–PSMD14 pair was not directly demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A non-canonical, proteasome-external role for human PSMD3 was proposed: PSMD3 physically interacts with HER2 and shields it from ubiquitin-mediated lysosomal degradation in breast cancer cells, with knockdown reducing HER2 levels and impairing cancer cell viability.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, LAMP-1 localization by immunostaining, colony formation and apoptosis assays in breast cancer cell lines\",\n      \"pmids\": [\"31013812\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PSMD3 acts on HER2 as part of the intact 26S proteasome or independently was not distinguished\",\n        \"Single-lab observation without independent replication\",\n        \"Direct binding domain on PSMD3 or HER2 was not mapped\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"PSMD3 was linked to NF-κB activation in CML cells, with knockdown reducing NF-κB protein levels, nuclear activity, and leukemic cell survival while sparing normal progenitors, suggesting a disease-relevant signaling role for this proteasome subunit.\",\n      \"evidence\": \"siRNA knockdown, NF-κB luciferase reporter, nucleocytoplasmic fractionation, immunoblot, cell viability and apoptosis assays in CML cell lines and patient samples\",\n      \"pmids\": [\"33712704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PSMD3 promotes NF-κB via proteasomal IκB degradation or a distinct mechanism was not resolved\",\n        \"Single-lab study; independent validation needed\",\n        \"Relationship between the HER2-stabilizing and NF-κB-activating roles is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of PSMD3's substrate-selective contribution to proteasomal degradation, the mechanism by which it stabilizes RPN11/PSMD14 during lid assembly, and whether its reported non-canonical roles in HER2 stabilization and NF-κB activation reflect proteasome-dependent or independent functions remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of PSMD3 in context of the human 19S lid with bound substrate\",\n        \"Proteasome-dependent versus proteasome-independent mechanisms for HER2 and NF-κB effects not distinguished\",\n        \"In vivo relevance of PSMD3 substrate selectivity in mammalian systems not tested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 5, 6]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"26S proteasome\",\n      \"19S regulatory particle lid\"\n    ],\n    \"partners\": [\n      \"PSMD14\",\n      \"HER2\",\n      \"USP14\",\n      \"PSMD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}