{"gene":"PSMB3","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1997,"finding":"PSMB3 (beta3 hs, HsC10-II) was mapped to human chromosome band 2q35 by fluorescence in situ hybridization, establishing its chromosomal locus and showing it is not closely linked to other proteasome beta subunit genes, consistent with independent transcriptional regulation of proteasome subunit genes.","method":"Fluorescence in situ hybridization (FISH) of genomic clones","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mapping experiment, single lab, orthogonal to sequence cloning, establishes chromosomal location with functional implication for independent regulation","pmids":["9344661"],"is_preprint":false},{"year":1999,"finding":"Mouse PSMB3 (C10-II) was cloned as one of the 20S proteasome core subunits; its identity as a proteasome component was verified by 2D NEPHGE-PAGE using antisera raised against the subunit or its orthologues, confirming it as part of the mammalian 20S proteasome.","method":"cDNA cloning, two-dimensional gel electrophoresis (NEPHGE-PAGE), immunological verification with antisera","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical identification in a defined complex, single lab, multiple orthogonal methods (cloning + immunological verification)","pmids":["10436176"],"is_preprint":false},{"year":2002,"finding":"Psmb3 was localized to distal mouse chromosome 11 within a 185-kb gene-dense contig, assigning its chromosomal position in the mouse genome for the first time.","method":"cDNA selection, sequencing, and comparative genomic mapping of a characterized contig","journal":"Cytogenetic and genome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — positional mapping from contig characterization, single lab, single method, no functional follow-up","pmids":["12438746"],"is_preprint":false},{"year":2007,"finding":"Depletion of PSMB3 (a 20S proteasome subunit) by siRNA inhibited monoubiquitination and/or nuclear foci formation of FANCD2, demonstrating that proteasomal function mediated by PSMB3 is required for activation of the Fanconi anemia DNA damage-response pathway.","method":"siRNA-mediated knockdown of PSMB3 in human cells, immunofluorescence for FANCD2 foci, western blot for FANCD2 monoubiquitination","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with specific cellular phenotype (FANCD2 monoubiquitination and foci), single lab, two orthogonal readouts","pmids":["17671210"],"is_preprint":false},{"year":2011,"finding":"siRNA-mediated knockdown of PSMB3 modulated AAV infection efficiency in human cells, indicating that PSMB3-dependent proteasomal activity participates in restricting AAV virion trafficking or processing through the secretory pathway.","method":"siRNA knockdown of PSMB3 in human airway epithelial cells, AAV infection efficiency assay","journal":"PLoS pathogens","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single knockdown experiment with infection phenotype, no direct mechanistic follow-up on PSMB3 specifically, single lab","pmids":["21625534"],"is_preprint":false},{"year":2013,"finding":"siRNA-mediated knockdown of PSMB3 in a human astrocytic cell line reduced CTG•CAG trinucleotide repeat expansions, demonstrating that the proteolytic activity of the 26S proteasome, including its PSMB3 subunit, drives trinucleotide repeat expansions in human cells.","method":"siRNA knockdown of PSMB3 in human astrocytic cells, trinucleotide repeat expansion assay, proteasome inhibitor treatment","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular phenotype (repeat expansions), corroborated by pharmacological inhibition and yeast genetics in same study, single lab","pmids":["23620289"],"is_preprint":false},{"year":2020,"finding":"Double knockdown of NFE2L1 and NFE2L3 significantly reduced basal expression of PSMB3 (among six other proteasome genes) and impaired basal proteasome activity in cancer cells, placing PSMB3 as a transcriptional target of the NFE2L1/NFE2L3 axis that maintains proteasome homeostasis.","method":"Double siRNA knockdown of NFE2L1 and NFE2L3 in cancer cell lines, qPCR and proteasome activity assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined gene expression and activity phenotype, single lab, two orthogonal readouts (mRNA and proteasome activity)","pmids":["32366381"],"is_preprint":false},{"year":2023,"finding":"PSMB3 silencing by siRNA in hepatocyte cell lines (HuH-7 and HepG2) was sufficient to increase TRIB1 mRNA expression, functionally linking PSMB3-dependent proteasome activity to transcriptional upregulation of TRIB1 under conditions of proteasome suppression.","method":"siRNA knockdown of PSMB3, RT-qPCR measurement of TRIB1 mRNA in human hepatocyte cell lines","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single knockdown readout, single lab, single method for the PSMB3-specific finding","pmids":["37291259"],"is_preprint":false},{"year":2023,"finding":"In Bactrocera dorsalis (oriental fruit fly), RNAi-mediated depletion of PSMB3 reduced 20-hydroxyecdysone (20E) titer in hemolymph, suppressed expression of 20E biosynthetic genes in the ovary, retarded ovarian development, and decreased fecundity; exogenous 20E rescued ovarian development, demonstrating that PSMB3 promotes ecdysteroidogenesis during female reproductive maturation in this insect.","method":"RNAi knockdown in Bactrocera dorsalis, ecdysone titer measurement, RNA-seq and qPCR of biosynthetic genes, fecundity assays, 20E rescue experiment","journal":"Insect biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RNAi, hormone measurement, transcriptomics, rescue), single lab; note this is an insect ortholog","pmids":["37172766"],"is_preprint":false}],"current_model":"PSMB3 encodes the beta3 subunit of the 20S proteasome core; its proteolytic activity within the 26S proteasome is required for FANCD2 monoubiquitination and Fanconi anemia pathway activation upon DNA damage, drives trinucleotide repeat expansions in human cells, restricts AAV virion processing, and regulates TRIB1 transcription in hepatocytes, while its expression is maintained by the NFE2L1/NFE2L3 transcription factor axis to sustain basal proteasome activity in cancer cells."},"narrative":{"mechanistic_narrative":"PSMB3 encodes the beta3 subunit of the mammalian 20S proteasome core particle, identified biochemically as an integral component of the assembled 20S proteasome [PMID:10436176] and mapped to a chromosomal locus independent of other proteasome beta subunit genes, consistent with subunit-autonomous transcriptional regulation [PMID:9344661]. Through its contribution to 26S proteasome proteolytic activity, PSMB3 supports a range of downstream cellular processes: its depletion impairs FANCD2 monoubiquitination and nuclear foci formation, establishing a requirement for proteasome function in activation of the Fanconi anemia DNA damage-response pathway [PMID:17671210], and reduces CTG•CAG trinucleotide repeat expansions, implicating proteasome activity in repeat instability [PMID:23620289]. Loss of PSMB3 also derepresses TRIB1 transcription in hepatocytes [PMID:37291259] and modulates AAV infection efficiency [PMID:21625534]. PSMB3 expression is sustained transcriptionally by the NFE2L1/NFE2L3 axis to maintain basal proteasome activity in cancer cells [PMID:32366381]. Beyond its role as a proteasome structural/catalytic subunit, no autonomous PSMB3-specific molecular activity distinct from the proteasome core has been characterized in the available corpus.","teleology":[{"year":1997,"claim":"Establishing the chromosomal locus of PSMB3 and showing it is unlinked to other proteasome beta subunit genes raised the possibility that proteasome subunit genes are regulated independently rather than as a coordinated cluster.","evidence":"FISH mapping of genomic clones to human 2q35","pmids":["9344661"],"confidence":"Medium","gaps":["Does not address protein function or proteasome assembly","Independent regulation inferred from genomic position, not demonstrated transcriptionally"]},{"year":1999,"claim":"Biochemical identification answered whether the cloned C10-II gene product is an actual proteasome component, confirming PSMB3 as a subunit of the mammalian 20S proteasome core.","evidence":"cDNA cloning with 2D NEPHGE-PAGE and antisera-based immunological verification in mouse","pmids":["10436176"],"confidence":"Medium","gaps":["No structural placement within the core particle","Catalytic contribution of beta3 not defined"]},{"year":2002,"claim":"Positional mapping in the mouse genome extended the comparative genomic localization of Psmb3 but added no functional information.","evidence":"cDNA selection, sequencing and contig mapping to distal mouse chromosome 11","pmids":["12438746"],"confidence":"Low","gaps":["Positional only, single method, no functional follow-up","No link to phenotype or regulation"]},{"year":2007,"claim":"Asking whether proteasome function is required for the DNA damage response, PSMB3 depletion was shown to block FANCD2 monoubiquitination and foci formation, linking the proteasome to Fanconi anemia pathway activation.","evidence":"siRNA knockdown of PSMB3 in human cells with FANCD2 immunofluorescence and western blot","pmids":["17671210"],"confidence":"Medium","gaps":["Whether the effect reflects beta3-specific or general proteasome loss not distinguished","Direct proteasome substrate driving FANCD2 modification not identified"]},{"year":2011,"claim":"Testing the role of proteasome activity in viral entry, PSMB3 knockdown altered AAV infection efficiency, implicating proteasomal processing in AAV virion trafficking.","evidence":"siRNA knockdown of PSMB3 in human airway epithelial cells with AAV infection assay","pmids":["21625534"],"confidence":"Low","gaps":["Single knockdown phenotype with no mechanistic follow-up on PSMB3 specifically","Step in viral life cycle affected not resolved"]},{"year":2013,"claim":"Addressing the source of trinucleotide repeat instability, PSMB3 depletion reduced CTG•CAG repeat expansions, showing 26S proteasome proteolytic activity drives repeat expansion in human cells.","evidence":"siRNA knockdown in human astrocytic cells with repeat expansion assay, corroborated by proteasome inhibitor treatment","pmids":["23620289"],"confidence":"Medium","gaps":["Proteasome substrate mediating expansion not identified","beta3-specific versus general proteasome contribution not separated"]},{"year":2020,"claim":"Defining how PSMB3 expression is maintained, double knockdown of NFE2L1/NFE2L3 reduced PSMB3 transcript levels and basal proteasome activity, placing PSMB3 under transcriptional control of this axis for proteasome homeostasis.","evidence":"Double siRNA knockdown of NFE2L1/NFE2L3 in cancer cell lines with qPCR and proteasome activity assays","pmids":["32366381"],"confidence":"Medium","gaps":["Direct promoter binding of NFE2L1/NFE2L3 at PSMB3 not shown","PSMB3 measured among a group of proteasome genes, not isolated"]},{"year":2023,"claim":"Asking how proteasome suppression feeds back on gene expression, PSMB3 silencing increased TRIB1 mRNA in hepatocytes, linking proteasome activity to TRIB1 transcriptional control.","evidence":"siRNA knockdown of PSMB3 with RT-qPCR for TRIB1 in HuH-7 and HepG2 cells","pmids":["37291259"],"confidence":"Low","gaps":["Single knockdown readout, single method","Mechanism connecting proteasome loss to TRIB1 induction not defined"]},{"year":2023,"claim":"In an insect ortholog, RNAi depletion of PSMB3 reduced 20-hydroxyecdysone titer and impaired ovarian development, rescued by exogenous 20E, indicating a role in ecdysteroidogenesis during reproduction.","evidence":"RNAi in Bactrocera dorsalis with ecdysone measurement, RNA-seq/qPCR, fecundity assays and 20E rescue","pmids":["37172766"],"confidence":"Medium","gaps":["Insect ortholog; relevance to mammalian PSMB3 unestablished","Mechanism linking proteasome to ecdysone biosynthesis not resolved"]},{"year":null,"claim":"Whether PSMB3 contributes any function distinct from its role as a structural/catalytic subunit of the 20S core, and which specific proteasome substrates mediate its effects on FANCD2 modification, repeat expansion, and TRIB1 regulation, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No subunit-autonomous activity demonstrated","Direct substrates underlying each downstream phenotype unidentified","Structural position of beta3 within the core particle not addressed in this corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1]}],"localization":[],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,6]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3]}],"complexes":["20S proteasome core particle","26S proteasome"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P49720","full_name":"Proteasome subunit beta type-3","aliases":["Proteasome chain 13","Proteasome component C10-II","Proteasome subunit beta-3","beta-3","Proteasome theta chain"],"length_aa":205,"mass_kda":22.9,"function":"Non-catalytic component of the 20S core proteasome complex involved in the proteolytic degradation of most intracellular proteins. This complex plays numerous essential roles within the cell by associating with different regulatory particles. Associated with two 19S regulatory particles, forms the 26S proteasome and thus participates in the ATP-dependent degradation of ubiquitinated proteins. The 26S proteasome plays a key role in the maintenance of protein homeostasis by removing misfolded or damaged proteins that could impair cellular functions, and by removing proteins whose functions are no longer required. Associated with the PA200 or PA28, the 20S proteasome mediates ubiquitin-independent protein degradation. This type of proteolysis is required in several pathways including spermatogenesis (20S-PA200 complex) or generation of a subset of MHC class I-presented antigenic peptides (20S-PA28 complex)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P49720/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PSMB3","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000277791","cell_line_id":"CID000100","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"PSMD4","stoichiometry":10.0},{"gene":"PSMC1","stoichiometry":10.0},{"gene":"PSMC5","stoichiometry":10.0},{"gene":"PSMD6","stoichiometry":10.0},{"gene":"PSME1","stoichiometry":10.0},{"gene":"PSMD2","stoichiometry":10.0},{"gene":"POMP","stoichiometry":10.0},{"gene":"PSMB7","stoichiometry":10.0},{"gene":"PSMC3","stoichiometry":10.0},{"gene":"PSMA4","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000100","total_profiled":1310},"omim":[{"mim_id":"617872","title":"COMBINED OXIDATIVE PHOSPHORYLATION DEFICIENCY 34; COXPD34","url":"https://www.omim.org/entry/617872"},{"mim_id":"611974","title":"MITOCHONDRIAL RIBOSOMAL PROTEIN S7; MRPS7","url":"https://www.omim.org/entry/611974"},{"mim_id":"602177","title":"PROTEASOME SUBUNIT, BETA-TYPE, 4; PSMB4","url":"https://www.omim.org/entry/602177"},{"mim_id":"602176","title":"PROTEASOME SUBUNIT, BETA-TYPE, 3; PSMB3","url":"https://www.omim.org/entry/602176"},{"mim_id":"602175","title":"PROTEASOME SUBUNIT, BETA-TYPE, 2; PSMB2","url":"https://www.omim.org/entry/602175"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PSMB3"},"hgnc":{"alias_symbol":["HC10-II","MGC4147"],"prev_symbol":[]},"alphafold":{"accession":"P49720","domains":[{"cath_id":"3.60.20.10","chopping":"2-199","consensus_level":"high","plddt":97.6087,"start":2,"end":199}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49720","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49720-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49720-F1-predicted_aligned_error_v6.png","plddt_mean":97.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PSMB3","jax_strain_url":"https://www.jax.org/strain/search?query=PSMB3"},"sequence":{"accession":"P49720","fasta_url":"https://rest.uniprot.org/uniprotkb/P49720.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49720/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49720"}},"corpus_meta":[{"pmid":"18281682","id":"PMC_18281682","title":"Identification of proteomic 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genomic clones\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mapping experiment, single lab, orthogonal to sequence cloning, establishes chromosomal location with functional implication for independent regulation\",\n      \"pmids\": [\"9344661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mouse PSMB3 (C10-II) was cloned as one of the 20S proteasome core subunits; its identity as a proteasome component was verified by 2D NEPHGE-PAGE using antisera raised against the subunit or its orthologues, confirming it as part of the mammalian 20S proteasome.\",\n      \"method\": \"cDNA cloning, two-dimensional gel electrophoresis (NEPHGE-PAGE), immunological verification with antisera\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical identification in a defined complex, single lab, multiple orthogonal methods (cloning + immunological verification)\",\n      \"pmids\": [\"10436176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Psmb3 was localized to distal mouse chromosome 11 within a 185-kb gene-dense contig, assigning its chromosomal position in the mouse genome for the first time.\",\n      \"method\": \"cDNA selection, sequencing, and comparative genomic mapping of a characterized contig\",\n      \"journal\": \"Cytogenetic and genome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — positional mapping from contig characterization, single lab, single method, no functional follow-up\",\n      \"pmids\": [\"12438746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Depletion of PSMB3 (a 20S proteasome subunit) by siRNA inhibited monoubiquitination and/or nuclear foci formation of FANCD2, demonstrating that proteasomal function mediated by PSMB3 is required for activation of the Fanconi anemia DNA damage-response pathway.\",\n      \"method\": \"siRNA-mediated knockdown of PSMB3 in human cells, immunofluorescence for FANCD2 foci, western blot for FANCD2 monoubiquitination\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with specific cellular phenotype (FANCD2 monoubiquitination and foci), single lab, two orthogonal readouts\",\n      \"pmids\": [\"17671210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"siRNA-mediated knockdown of PSMB3 modulated AAV infection efficiency in human cells, indicating that PSMB3-dependent proteasomal activity participates in restricting AAV virion trafficking or processing through the secretory pathway.\",\n      \"method\": \"siRNA knockdown of PSMB3 in human airway epithelial cells, AAV infection efficiency assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single knockdown experiment with infection phenotype, no direct mechanistic follow-up on PSMB3 specifically, single lab\",\n      \"pmids\": [\"21625534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"siRNA-mediated knockdown of PSMB3 in a human astrocytic cell line reduced CTG•CAG trinucleotide repeat expansions, demonstrating that the proteolytic activity of the 26S proteasome, including its PSMB3 subunit, drives trinucleotide repeat expansions in human cells.\",\n      \"method\": \"siRNA knockdown of PSMB3 in human astrocytic cells, trinucleotide repeat expansion assay, proteasome inhibitor treatment\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular phenotype (repeat expansions), corroborated by pharmacological inhibition and yeast genetics in same study, single lab\",\n      \"pmids\": [\"23620289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Double knockdown of NFE2L1 and NFE2L3 significantly reduced basal expression of PSMB3 (among six other proteasome genes) and impaired basal proteasome activity in cancer cells, placing PSMB3 as a transcriptional target of the NFE2L1/NFE2L3 axis that maintains proteasome homeostasis.\",\n      \"method\": \"Double siRNA knockdown of NFE2L1 and NFE2L3 in cancer cell lines, qPCR and proteasome activity assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined gene expression and activity phenotype, single lab, two orthogonal readouts (mRNA and proteasome activity)\",\n      \"pmids\": [\"32366381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PSMB3 silencing by siRNA in hepatocyte cell lines (HuH-7 and HepG2) was sufficient to increase TRIB1 mRNA expression, functionally linking PSMB3-dependent proteasome activity to transcriptional upregulation of TRIB1 under conditions of proteasome suppression.\",\n      \"method\": \"siRNA knockdown of PSMB3, RT-qPCR measurement of TRIB1 mRNA in human hepatocyte cell lines\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single knockdown readout, single lab, single method for the PSMB3-specific finding\",\n      \"pmids\": [\"37291259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In Bactrocera dorsalis (oriental fruit fly), RNAi-mediated depletion of PSMB3 reduced 20-hydroxyecdysone (20E) titer in hemolymph, suppressed expression of 20E biosynthetic genes in the ovary, retarded ovarian development, and decreased fecundity; exogenous 20E rescued ovarian development, demonstrating that PSMB3 promotes ecdysteroidogenesis during female reproductive maturation in this insect.\",\n      \"method\": \"RNAi knockdown in Bactrocera dorsalis, ecdysone titer measurement, RNA-seq and qPCR of biosynthetic genes, fecundity assays, 20E rescue experiment\",\n      \"journal\": \"Insect biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RNAi, hormone measurement, transcriptomics, rescue), single lab; note this is an insect ortholog\",\n      \"pmids\": [\"37172766\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PSMB3 encodes the beta3 subunit of the 20S proteasome core; its proteolytic activity within the 26S proteasome is required for FANCD2 monoubiquitination and Fanconi anemia pathway activation upon DNA damage, drives trinucleotide repeat expansions in human cells, restricts AAV virion processing, and regulates TRIB1 transcription in hepatocytes, while its expression is maintained by the NFE2L1/NFE2L3 transcription factor axis to sustain basal proteasome activity in cancer cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PSMB3 encodes the beta3 subunit of the mammalian 20S proteasome core particle, identified biochemically as an integral component of the assembled 20S proteasome [#1] and mapped to a chromosomal locus independent of other proteasome beta subunit genes, consistent with subunit-autonomous transcriptional regulation [#0]. Through its contribution to 26S proteasome proteolytic activity, PSMB3 supports a range of downstream cellular processes: its depletion impairs FANCD2 monoubiquitination and nuclear foci formation, establishing a requirement for proteasome function in activation of the Fanconi anemia DNA damage-response pathway [#3], and reduces CTG\\u2022CAG trinucleotide repeat expansions, implicating proteasome activity in repeat instability [#5]. Loss of PSMB3 also derepresses TRIB1 transcription in hepatocytes [#7] and modulates AAV infection efficiency [#4]. PSMB3 expression is sustained transcriptionally by the NFE2L1/NFE2L3 axis to maintain basal proteasome activity in cancer cells [#6]. Beyond its role as a proteasome structural/catalytic subunit, no autonomous PSMB3-specific molecular activity distinct from the proteasome core has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing the chromosomal locus of PSMB3 and showing it is unlinked to other proteasome beta subunit genes raised the possibility that proteasome subunit genes are regulated independently rather than as a coordinated cluster.\",\n      \"evidence\": \"FISH mapping of genomic clones to human 2q35\",\n      \"pmids\": [\"9344661\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not address protein function or proteasome assembly\", \"Independent regulation inferred from genomic position, not demonstrated transcriptionally\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Biochemical identification answered whether the cloned C10-II gene product is an actual proteasome component, confirming PSMB3 as a subunit of the mammalian 20S proteasome core.\",\n      \"evidence\": \"cDNA cloning with 2D NEPHGE-PAGE and antisera-based immunological verification in mouse\",\n      \"pmids\": [\"10436176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural placement within the core particle\", \"Catalytic contribution of beta3 not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Positional mapping in the mouse genome extended the comparative genomic localization of Psmb3 but added no functional information.\",\n      \"evidence\": \"cDNA selection, sequencing and contig mapping to distal mouse chromosome 11\",\n      \"pmids\": [\"12438746\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Positional only, single method, no functional follow-up\", \"No link to phenotype or regulation\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Asking whether proteasome function is required for the DNA damage response, PSMB3 depletion was shown to block FANCD2 monoubiquitination and foci formation, linking the proteasome to Fanconi anemia pathway activation.\",\n      \"evidence\": \"siRNA knockdown of PSMB3 in human cells with FANCD2 immunofluorescence and western blot\",\n      \"pmids\": [\"17671210\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the effect reflects beta3-specific or general proteasome loss not distinguished\", \"Direct proteasome substrate driving FANCD2 modification not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Testing the role of proteasome activity in viral entry, PSMB3 knockdown altered AAV infection efficiency, implicating proteasomal processing in AAV virion trafficking.\",\n      \"evidence\": \"siRNA knockdown of PSMB3 in human airway epithelial cells with AAV infection assay\",\n      \"pmids\": [\"21625534\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single knockdown phenotype with no mechanistic follow-up on PSMB3 specifically\", \"Step in viral life cycle affected not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Addressing the source of trinucleotide repeat instability, PSMB3 depletion reduced CTG\\u2022CAG repeat expansions, showing 26S proteasome proteolytic activity drives repeat expansion in human cells.\",\n      \"evidence\": \"siRNA knockdown in human astrocytic cells with repeat expansion assay, corroborated by proteasome inhibitor treatment\",\n      \"pmids\": [\"23620289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proteasome substrate mediating expansion not identified\", \"beta3-specific versus general proteasome contribution not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining how PSMB3 expression is maintained, double knockdown of NFE2L1/NFE2L3 reduced PSMB3 transcript levels and basal proteasome activity, placing PSMB3 under transcriptional control of this axis for proteasome homeostasis.\",\n      \"evidence\": \"Double siRNA knockdown of NFE2L1/NFE2L3 in cancer cell lines with qPCR and proteasome activity assays\",\n      \"pmids\": [\"32366381\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding of NFE2L1/NFE2L3 at PSMB3 not shown\", \"PSMB3 measured among a group of proteasome genes, not isolated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Asking how proteasome suppression feeds back on gene expression, PSMB3 silencing increased TRIB1 mRNA in hepatocytes, linking proteasome activity to TRIB1 transcriptional control.\",\n      \"evidence\": \"siRNA knockdown of PSMB3 with RT-qPCR for TRIB1 in HuH-7 and HepG2 cells\",\n      \"pmids\": [\"37291259\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single knockdown readout, single method\", \"Mechanism connecting proteasome loss to TRIB1 induction not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"In an insect ortholog, RNAi depletion of PSMB3 reduced 20-hydroxyecdysone titer and impaired ovarian development, rescued by exogenous 20E, indicating a role in ecdysteroidogenesis during reproduction.\",\n      \"evidence\": \"RNAi in Bactrocera dorsalis with ecdysone measurement, RNA-seq/qPCR, fecundity assays and 20E rescue\",\n      \"pmids\": [\"37172766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Insect ortholog; relevance to mammalian PSMB3 unestablished\", \"Mechanism linking proteasome to ecdysone biosynthesis not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether PSMB3 contributes any function distinct from its role as a structural/catalytic subunit of the 20S core, and which specific proteasome substrates mediate its effects on FANCD2 modification, repeat expansion, and TRIB1 regulation, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No subunit-autonomous activity demonstrated\", \"Direct substrates underlying each downstream phenotype unidentified\", \"Structural position of beta3 within the core particle not addressed in this corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\"20S proteasome core particle\", \"26S proteasome\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}