{"gene":"PSMB7","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1996,"finding":"The 20S proteasome, of which PSMB7 (β2) is a subunit, was characterized as a multisubunit barrel-shaped complex containing multiple distinct peptidase activities (chymotrypsin-like, trypsin-like, and peptidyl-glutamyl peptide-hydrolyzing/caspase-like) that operate through a novel threonine-based active-site mechanism; the catalytic β subunits including PSMB7 reside in the two inner rings of the four-ring 20S structure.","method":"Biochemical purification, peptidase activity assays, electron microscopy, active-site characterization","journal":"Annual review of biochemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro activities, structural analysis, replicated across multiple labs over many years","pmids":["8811196"],"is_preprint":false},{"year":2009,"finding":"PSMB7 (β2), as part of the 20S core particle of the 26S proteasome, contributes to the trypsin-like proteolytic activity within the internal chamber where substrates are hydrolyzed after being unfolded and translocated through the narrow gated channel by the 19S regulatory particle ATPases.","method":"In vitro proteasome reconstitution, active-site inhibitor studies, structural analysis","journal":"Annual review of biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mechanistic dissection, extensively replicated","pmids":["19489727"],"is_preprint":false},{"year":2010,"finding":"Upon interferon stimulation, the standard proteasome subunit PSMB7 (β2) is replaced by its immunoproteasome counterpart (PSMB10/β2i) to form immunoproteasomes; cells lacking immunoproteasome subunits (including the β2i replacement) accumulate oxidant-damaged protein aggregates and show increased apoptosis under IFN-induced oxidative stress, indicating that the β2-containing standard proteasome is less efficient than the β2i-containing immunoproteasome at clearing oxidatively damaged proteins.","method":"Genetic knockout of immunoproteasome subunits, RNAi knockdown, flow cytometry for aggresomes, viability assays, murine inflammation models","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean KO/KD with defined cellular phenotype, replicated in cell lines and in vivo mouse models","pmids":["20723761"],"is_preprint":false},{"year":2013,"finding":"siRNA-mediated knockdown of PSMB7 in neonatal cardiomyocytes significantly decreased peptidyl-glutamyl peptide-hydrolyzing (caspase-like) activity of the proteasome without affecting chymotrypsin-like or trypsin-like activities, induced ER stress (upregulation of DDIT3/CHOP and HSPA5/GRP78 mRNA), increased MTOR mRNA, and triggered autophagy as evidenced by increased LC3-marked vacuoles and monodansylcadaverine-positive autophagic vacuoles; this effect was exacerbated after anoxia-reoxygenation.","method":"siRNA knockdown, RT-PCR, single-cell RT-qPCR, immunohistochemistry (LC3), fluorescence staining (MDC), proteasome peptidase activity assays","journal":"Pathobiology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single study; single lab","pmids":["23969338"],"is_preprint":false}],"current_model":"PSMB7 (proteasome subunit β2) is one of the catalytic β subunits of the 20S proteasome core particle, contributing primarily to peptidyl-glutamyl peptide-hydrolyzing (caspase-like) activity via a threonine active-site mechanism; its knockdown in cardiomyocytes selectively abolishes this activity, triggers ER stress and autophagy, and its replacement by the immunoproteasome subunit PSMB10 (β2i) upon interferon stimulation enhances clearance of oxidatively damaged proteins to maintain cell viability."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing that PSMB7 resides in the catalytic inner rings of the 20S proteasome and participates in a novel threonine-based proteolytic mechanism resolved the identity of the active-site residue and the multi-activity architecture of the proteasome.","evidence":"Biochemical purification, peptidase activity assays, electron microscopy, and active-site characterization of purified 20S complexes","pmids":["8811196"],"confidence":"High","gaps":["Specific catalytic contribution of the β2 subunit versus β1 and β5 was not individually resolved","No knockout or knockdown data for PSMB7 alone"]},{"year":2009,"claim":"Reconstitution and inhibitor studies clarified that PSMB7 contributes trypsin-like activity and that substrates must be unfolded and translocated by the 19S ATPases before reaching the catalytic chamber, placing PSMB7 function downstream of gated substrate entry.","evidence":"In vitro proteasome reconstitution with active-site inhibitors and structural analysis","pmids":["19489727"],"confidence":"High","gaps":["Relative contribution of β2 to total proteasome flux in intact cells was not quantified","Whether β2 activity is rate-limiting for any specific substrate class was unknown"]},{"year":2010,"claim":"Demonstrating that interferon-induced replacement of PSMB7 by PSMB10 (β2i) is required to prevent accumulation of oxidant-damaged aggregates established a functional distinction between the constitutive and immunoproteasome β2 subunits under oxidative stress.","evidence":"Genetic knockout and RNAi of immunoproteasome subunits, aggresome flow cytometry, viability assays in cell lines and mouse inflammation models","pmids":["20723761"],"confidence":"High","gaps":["Structural basis for the enhanced clearance by β2i versus β2 was not determined","Whether PSMB7 itself is actively degraded during the subunit switch or diluted by new assembly was not resolved"]},{"year":2013,"claim":"Selective knockdown of PSMB7 in cardiomyocytes showed it is specifically required for caspase-like proteasome activity and that its loss triggers ER stress and compensatory autophagy, revealing a non-redundant role in cardiac proteostasis.","evidence":"siRNA knockdown in neonatal cardiomyocytes, proteasome peptidase activity assays, RT-qPCR for ER stress markers, LC3 and MDC staining for autophagy","pmids":["23969338"],"confidence":"Medium","gaps":["Single-lab study; independent replication in additional cardiac or non-cardiac models is lacking","Whether the ER stress response is a direct consequence of reduced caspase-like activity or secondary to aggregate accumulation was not dissected","In vivo cardiac phenotype of PSMB7 deficiency has not been reported"]},{"year":null,"claim":"The structural basis for PSMB7's selective contribution to caspase-like versus other proteasomal activities, its substrate specificity within the assembled 20S complex, and the in vivo consequences of its loss in adult tissues remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No conditional knockout phenotype in adult organisms","No substrate-level proteomics identifying PSMB7-dependent degradation targets","No structural comparison of β2 versus β2i active-site pockets at atomic resolution"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2,3]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3]}],"complexes":["20S proteasome","26S proteasome"],"partners":["PSMB10"],"other_free_text":[]},"mechanistic_narrative":"PSMB7 (β2) is a catalytic subunit of the 20S proteasome core particle that contributes caspase-like (peptidyl-glutamyl peptide-hydrolyzing) proteolytic activity through an N-terminal threonine active-site mechanism [PMID:8811196, PMID:19489727]. siRNA-mediated knockdown of PSMB7 in cardiomyocytes selectively abolishes caspase-like activity without affecting chymotrypsin-like or trypsin-like activities, and induces ER stress and autophagy that is exacerbated by anoxia–reoxygenation [PMID:23969338]. Upon interferon-γ stimulation, PSMB7 is replaced by the immunoproteasome counterpart PSMB10 (β2i), and cells lacking this replacement accumulate oxidant-damaged protein aggregates and undergo increased apoptosis, indicating that the standard β2-containing proteasome is less efficient than the immunoproteasome at clearing oxidatively damaged substrates [PMID:20723761]."},"prefetch_data":{"uniprot":{"accession":"Q99436","full_name":"Proteasome subunit beta type-7","aliases":["Macropain chain Z","Multicatalytic endopeptidase complex chain Z","Proteasome subunit Z","Proteasome subunit beta-2","beta-2"],"length_aa":277,"mass_kda":30.0,"function":"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). Within the 20S core complex, PSMB7 displays a trypsin-like activity","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q99436/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PSMB7","classification":"Common 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PSMB11","url":"https://www.omim.org/entry/611137"},{"mim_id":"604030","title":"PROTEASOME SUBUNIT, BETA-TYPE, 7; PSMB7","url":"https://www.omim.org/entry/604030"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PSMB7"},"hgnc":{"alias_symbol":["Z"],"prev_symbol":[]},"alphafold":{"accession":"Q99436","domains":[{"cath_id":"3.60.20.10","chopping":"40-232","consensus_level":"medium","plddt":95.3634,"start":40,"end":232}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99436","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99436-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99436-F1-predicted_aligned_error_v6.png","plddt_mean":90.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PSMB7","jax_strain_url":"https://www.jax.org/strain/search?query=PSMB7"},"sequence":{"accession":"Q99436","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99436.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99436/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99436"}},"corpus_meta":[{"pmid":"32200799","id":"PMC_32200799","title":"Influenza Virus Z-RNAs Induce 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autophagic vacuoles\",\n      \"journal\": \"Pathobiology : journal of immunopathology, molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and enzymatic activity readout; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"23969338\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PSMB7 is a non-catalytic subunit of the 20S proteasome whose loss selectively impairs peptidyl-glutamyl peptide-hydrolyzing (caspase-like) proteasomal activity, and its deficiency in cardiomyocytes triggers ER stress and autophagy induction.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking through the corpus, I need to identify papers actually about PSMB7 (proteasome subunit beta 7, a component of the 20S proteasome).\n\n**Classification:**\n\n- Papers [1]-[99] in the main corpus: Nearly all are about H2A.Z histone variant, Z-DNA/Z-RNA, Protein Z (coagulation), Z-disk, bacterial FtsZ, tRNase Z, or other \"Z\"-named entities. These are ALIAS COLLISIONS / unrelated genes — EXCLUDE.\n\n- Paper [100] (PMID:23969338): Directly about PSMB7 knockdown in cardiomyocytes → KEEP\n\n- Gene2pubmed papers:\n  - PMID:8811196 (20S/26S proteasome structure/function) → KEEP (describes the proteasome complex PSMB7 is part of, with mechanistic detail)\n  - PMID:20723761 (immunoproteasomes) → KEEP (mechanistic study of i-proteasomes, relevant to PSMB7's catalytic activity context)\n  - PMID:19489727 (proteasome recognition/processing) → KEEP (mechanistic detail on 20S proteasome)\n  - PMID:21906983, 21890473 (ubiquitylome proteomics) → general proteomics, no PSMB7-specific mechanism → EXCLUDE\n  - PMID:16169070, 26186194, 28514442, 26496610, 17353931, 33961781, 22939629 (protein interaction networks) → identify PSMB7 as part of proteasome complex by AP-MS, no PSMB7-specific mechanism → EXCLUDE\n  - PMID:23503661, 15592455, 14564014, 12167863, 12808466, 12809610, 14528300, 12859895, 14528301, 14527406, 12750511, 12808465 (APOBEC3G/Vif/HIV papers) → unrelated → EXCLUDE\n  - PMID:12477932, 14702039 (cDNA sequencing) → EXCLUDE\n  - PMID:21873635 (GO annotation) → EXCLUDE\n  - PMID:21565611 (ciliopathy) → EXCLUDE\n  - PMID:8125298 (oligo-capping) → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"The 20S proteasome, of which PSMB7 (β2) is a subunit, was characterized as a multisubunit barrel-shaped complex containing multiple distinct peptidase activities (chymotrypsin-like, trypsin-like, and peptidyl-glutamyl peptide-hydrolyzing/caspase-like) that operate through a novel threonine-based active-site mechanism; the catalytic β subunits including PSMB7 reside in the two inner rings of the four-ring 20S structure.\",\n      \"method\": \"Biochemical purification, peptidase activity assays, electron microscopy, active-site characterization\",\n      \"journal\": \"Annual review of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro activities, structural analysis, replicated across multiple labs over many years\",\n      \"pmids\": [\"8811196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PSMB7 (β2), as part of the 20S core particle of the 26S proteasome, contributes to the trypsin-like proteolytic activity within the internal chamber where substrates are hydrolyzed after being unfolded and translocated through the narrow gated channel by the 19S regulatory particle ATPases.\",\n      \"method\": \"In vitro proteasome reconstitution, active-site inhibitor studies, structural analysis\",\n      \"journal\": \"Annual review of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mechanistic dissection, extensively replicated\",\n      \"pmids\": [\"19489727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Upon interferon stimulation, the standard proteasome subunit PSMB7 (β2) is replaced by its immunoproteasome counterpart (PSMB10/β2i) to form immunoproteasomes; cells lacking immunoproteasome subunits (including the β2i replacement) accumulate oxidant-damaged protein aggregates and show increased apoptosis under IFN-induced oxidative stress, indicating that the β2-containing standard proteasome is less efficient than the β2i-containing immunoproteasome at clearing oxidatively damaged proteins.\",\n      \"method\": \"Genetic knockout of immunoproteasome subunits, RNAi knockdown, flow cytometry for aggresomes, viability assays, murine inflammation models\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO/KD with defined cellular phenotype, replicated in cell lines and in vivo mouse models\",\n      \"pmids\": [\"20723761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"siRNA-mediated knockdown of PSMB7 in neonatal cardiomyocytes significantly decreased peptidyl-glutamyl peptide-hydrolyzing (caspase-like) activity of the proteasome without affecting chymotrypsin-like or trypsin-like activities, induced ER stress (upregulation of DDIT3/CHOP and HSPA5/GRP78 mRNA), increased MTOR mRNA, and triggered autophagy as evidenced by increased LC3-marked vacuoles and monodansylcadaverine-positive autophagic vacuoles; this effect was exacerbated after anoxia-reoxygenation.\",\n      \"method\": \"siRNA knockdown, RT-PCR, single-cell RT-qPCR, immunohistochemistry (LC3), fluorescence staining (MDC), proteasome peptidase activity assays\",\n      \"journal\": \"Pathobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single study; single lab\",\n      \"pmids\": [\"23969338\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PSMB7 (proteasome subunit β2) is one of the catalytic β subunits of the 20S proteasome core particle, contributing primarily to peptidyl-glutamyl peptide-hydrolyzing (caspase-like) activity via a threonine active-site mechanism; its knockdown in cardiomyocytes selectively abolishes this activity, triggers ER stress and autophagy, and its replacement by the immunoproteasome subunit PSMB10 (β2i) upon interferon stimulation enhances clearance of oxidatively damaged proteins to maintain cell viability.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PSMB7 is a subunit of the 20S proteasome that is specifically required for peptidyl-glutamyl peptide-hydrolyzing (caspase-like) proteasomal activity; its knockdown in cardiomyocytes selectively abolishes this activity without affecting chymotrypsin-like or trypsin-like activities [PMID:23969338]. Loss of PSMB7 induces ER stress, as shown by upregulation of DDIT3/CHOP and HSPA5/GRP78, and triggers autophagy marked by increased LC3-positive and MDC-stained autophagic vacuoles [PMID:23969338].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that PSMB7, despite being classified as a non-catalytic proteasome subunit, is selectively required for caspase-like proteasomal activity and that its loss in cardiomyocytes activates ER stress and autophagy — linking a specific proteasome subunit to proteostasis-dependent cell stress pathways.\",\n      \"evidence\": \"siRNA knockdown in neonatal cardiomyocytes with proteasome activity assays, single-cell RT-qPCR for ER stress markers, and LC3/MDC staining for autophagy\",\n      \"pmids\": [\"23969338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding in neonatal cardiomyocytes; not independently replicated in other cell types or in vivo\",\n        \"Mechanism by which a non-catalytic subunit selectively controls caspase-like activity is not resolved\",\n        \"Whether the autophagy induction is a direct consequence of ER stress or an independent response to proteasome dysfunction is unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for PSMB7's selective requirement for caspase-like activity, its role in other tissues beyond cardiomyocytes, and whether its loss leads to pathological outcomes in vivo remain uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vivo genetic model (knockout or mutant) has been reported\",\n        \"No structural or reconstitution data explaining selectivity for caspase-like activity\",\n        \"No disease association established through human genetic studies\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0005198\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0005829\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"pathway\": [\n      {\n        \"term_id\": \"GO:0392499\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"complexes\": [\"20S proteasome\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to verify the pathway term_id. Let me correct this — the allowed Reactome pathway for protein metabolism is `R-HSA-392499`. Let me also reconsider whether to include autophagy pathway. Let me also reconsider the localization — the discovery doesn't explicitly state cytosolic localization, only that it's a proteasome subunit. Given only Medium confidence from a single discovery, I should be cautious. Let me revise:\n\n```json\n{\n  \"mechanistic_narrative\": \"PSMB7 is a subunit of the 20S proteasome that is selectively required for peptidyl-glutamyl peptide-hydrolyzing (caspase-like) proteasomal activity; its knockdown in cardiomyocytes abolishes this activity without affecting chymotrypsin-like or trypsin-like activities [PMID:23969338]. Loss of PSMB7 induces ER stress, marked by upregulation of DDIT3/CHOP and HSPA5/GRP78, and triggers autophagy as evidenced by increased LC3-positive and MDC-stained autophagic vacuoles [PMID:23969338].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that PSMB7, despite being classified as a non-catalytic proteasome subunit, is selectively required for caspase-like proteasomal activity and that its loss activates ER stress and autophagy in cardiomyocytes — linking a specific proteasome subunit to proteostasis-dependent stress pathways.\",\n      \"evidence\": \"siRNA knockdown in neonatal cardiomyocytes with proteasome activity assays, single-cell RT-qPCR for ER stress markers, and LC3/MDC staining for autophagy\",\n      \"pmids\": [\"23969338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding in neonatal cardiomyocytes; not independently replicated in other cell types or in vivo\",\n        \"Mechanism by which a non-catalytic subunit selectively controls caspase-like activity is not resolved\",\n        \"Whether autophagy induction is a direct consequence of ER stress or an independent response to proteasome dysfunction is unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for PSMB7's selective requirement for caspase-like activity, its role in tissues beyond cardiomyocytes, and whether its loss leads to pathological outcomes in vivo remain uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vivo genetic model (knockout or mutant) has been reported\",\n        \"No structural or reconstitution data explaining selectivity for caspase-like activity\",\n        \"No disease association established through human genetic studies\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0005198\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\n        \"term_id\": \"R-HSA-392499\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"complexes\": [\"20S proteasome\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"PSMB7 (β2) is a catalytic subunit of the 20S proteasome core particle that contributes caspase-like (peptidyl-glutamyl peptide-hydrolyzing) proteolytic activity through an N-terminal threonine active-site mechanism [PMID:8811196, PMID:19489727]. siRNA-mediated knockdown of PSMB7 in cardiomyocytes selectively abolishes caspase-like activity without affecting chymotrypsin-like or trypsin-like activities, and induces ER stress and autophagy that is exacerbated by anoxia–reoxygenation [PMID:23969338]. Upon interferon-γ stimulation, PSMB7 is replaced by the immunoproteasome counterpart PSMB10 (β2i), and cells lacking this replacement accumulate oxidant-damaged protein aggregates and undergo increased apoptosis, indicating that the standard β2-containing proteasome is less efficient than the immunoproteasome at clearing oxidatively damaged substrates [PMID:20723761].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that PSMB7 resides in the catalytic inner rings of the 20S proteasome and participates in a novel threonine-based proteolytic mechanism resolved the identity of the active-site residue and the multi-activity architecture of the proteasome.\",\n      \"evidence\": \"Biochemical purification, peptidase activity assays, electron microscopy, and active-site characterization of purified 20S complexes\",\n      \"pmids\": [\"8811196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific catalytic contribution of the β2 subunit versus β1 and β5 was not individually resolved\",\n        \"No knockout or knockdown data for PSMB7 alone\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstitution and inhibitor studies clarified that PSMB7 contributes trypsin-like activity and that substrates must be unfolded and translocated by the 19S ATPases before reaching the catalytic chamber, placing PSMB7 function downstream of gated substrate entry.\",\n      \"evidence\": \"In vitro proteasome reconstitution with active-site inhibitors and structural analysis\",\n      \"pmids\": [\"19489727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative contribution of β2 to total proteasome flux in intact cells was not quantified\",\n        \"Whether β2 activity is rate-limiting for any specific substrate class was unknown\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that interferon-induced replacement of PSMB7 by PSMB10 (β2i) is required to prevent accumulation of oxidant-damaged aggregates established a functional distinction between the constitutive and immunoproteasome β2 subunits under oxidative stress.\",\n      \"evidence\": \"Genetic knockout and RNAi of immunoproteasome subunits, aggresome flow cytometry, viability assays in cell lines and mouse inflammation models\",\n      \"pmids\": [\"20723761\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for the enhanced clearance by β2i versus β2 was not determined\",\n        \"Whether PSMB7 itself is actively degraded during the subunit switch or diluted by new assembly was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Selective knockdown of PSMB7 in cardiomyocytes showed it is specifically required for caspase-like proteasome activity and that its loss triggers ER stress and compensatory autophagy, revealing a non-redundant role in cardiac proteostasis.\",\n      \"evidence\": \"siRNA knockdown in neonatal cardiomyocytes, proteasome peptidase activity assays, RT-qPCR for ER stress markers, LC3 and MDC staining for autophagy\",\n      \"pmids\": [\"23969338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; independent replication in additional cardiac or non-cardiac models is lacking\",\n        \"Whether the ER stress response is a direct consequence of reduced caspase-like activity or secondary to aggregate accumulation was not dissected\",\n        \"In vivo cardiac phenotype of PSMB7 deficiency has not been reported\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for PSMB7's selective contribution to caspase-like versus other proteasomal activities, its substrate specificity within the assembled 20S complex, and the in vivo consequences of its loss in adult tissues remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No conditional knockout phenotype in adult organisms\",\n        \"No substrate-level proteomics identifying PSMB7-dependent degradation targets\",\n        \"No structural comparison of β2 versus β2i active-site pockets at atomic resolution\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"20S proteasome\",\n      \"26S proteasome\"\n    ],\n    \"partners\": [\n      \"PSMB10\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}