{"gene":"GZMB","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1988,"finding":"GZMB (CCPI/CSP-B) encodes a cytotoxic T lymphocyte-specific serine protease; gene organization reveals each active-site residue (His, Asp, Ser) is contained on a separate exon, consistent with the serine protease catalytic triad architecture. Two introns occur in unusual positions: one within the activation dipeptide and one near the active-site Asp residue in the invariant core region, defining GZMB as a member of a new subfamily of serine protease genes.","method":"Gene isolation, sequencing, and structural analysis of coding/noncoding regions","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct gene sequencing with structural characterization of active-site exon organization, foundational mechanism paper","pmids":["3264185"],"is_preprint":false},{"year":1990,"finding":"The CSP-B/GZMB gene is transcriptionally activated during cytotoxic T-lymphocyte maturation. TPA and bt2cAMP act synergistically to induce transcription; neither agent alone is sufficient. A DNase I-hypersensitive site forms upstream upon activation, and two regulatory regions at -609 to -202 and -202 to -80 relative to the transcriptional start site drive activation.","method":"Transient transfection of promoter constructs, DNase I hypersensitivity assay, RNA analysis in PEER T-cell line","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (chromatin accessibility, promoter deletion mapping, transfection) in a single study","pmids":["2233710"],"is_preprint":false},{"year":1991,"finding":"The 5'-flanking region of the human CSP-B/GZMB gene is sufficient to target expression specifically to activated T-lymphocytes in vivo; expression is induced by T-cell receptor signaling (concanavalin A) or IL-2 receptor signaling, demonstrating that GZMB regulatory sequences are responsive to both activation pathways.","method":"Transgenic mouse reporter assay (human growth hormone driven by CSP-B promoter), T-cell activation experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic model with functional promoter validation and multiple activation conditions tested","pmids":["1761544"],"is_preprint":false},{"year":1993,"finding":"Transcriptional activation of GZMB requires synergy between a consensus AP-1 element and a consensus CRE located 5' to the transcriptional start site. Single nucleotide substitutions in the AP-1 site abolish activity; point mutations in the CRE substantially reduce activity. Replacing the CRE with a second AP-1 site preserves activity, but replacing the AP-1 site with a CRE abolishes activity. Helical spacing between the two elements must be preserved for full synergism, indicating cooperative protein-DNA or protein-protein interactions.","method":"Transient transfection with promoter mutants, luciferase/reporter assays in TPA+bt2cAMP-stimulated PEER cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic site-directed mutagenesis of regulatory elements with functional readout, multiple orthogonal mutations tested","pmids":["8219227"],"is_preprint":false},{"year":2009,"finding":"GzmB controls ectromelia (mousepox) virus replication through a caspase-3/-7-dependent mechanism. GzmB-induced apoptosis in virus-infected cells is completely blocked when caspase-3/-7 are absent. The Bid/Bak/Bax pathway activated by GzmB is only partially inhibited by virus and does not account for viral replication control; inhibition of viral replication in vitro requires caspase-3/-7 activity downstream of GzmB.","method":"Ex vivo cytotoxic T cell assays using granzyme-deficient (GzmAxB-/-) and caspase-deficient target cells, viral titer measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic dissection with multiple knockout combinations, functional viral titer readout, orthogonal apoptosis assays","pmids":["19838298"],"is_preprint":false},{"year":2011,"finding":"Human miR-27a* negatively regulates NK-cell cytotoxicity by directly binding to the 3' UTR of both Prf1 and GzmB mRNAs, down-regulating their expression in resting and activated NK cells. Knockdown of miR-27a* dramatically increases NK cytotoxicity in vitro and decreases tumor growth in a xenograft model.","method":"3'UTR reporter assays, miRNA knockdown/overexpression in primary NK cells, in vitro cytotoxicity assays, xenograft tumor model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct 3'UTR binding validation, functional NK cytotoxicity assays, in vivo xenograft confirmation","pmids":["21960590"],"is_preprint":false},{"year":2013,"finding":"Hypoxia-induced autophagy in breast cancer cells selectively degrades GZMB delivered by NK cells, thereby blocking NK-mediated apoptosis of target cells. Inhibiting autophagy restores susceptibility to NK-mediated lysis and promotes tumor regression in vivo.","method":"Autophagy inhibition experiments, in vitro NK cytotoxicity assays, GZMB detection in hypoxic cells, in vivo tumor model","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanistic linkage between autophagy, GZMB degradation, and NK killing established with both in vitro and in vivo evidence","pmids":["24248158"],"is_preprint":false},{"year":2015,"finding":"miR-378 suppresses GzmB expression in NK cells during dengue virus infection. Overexpression of miR-378 in DENV-infected mice inhibited GzmB expression and promoted DENV replication, establishing that suppression of miR-378 is required for GzmB-mediated control of dengue virus.","method":"miRNA agomir overexpression in DENV-infected mice, GzmB expression measurement, viral replication assays","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo mouse experiment with functional readout but single lab, and 3'UTR binding of miR-378 to GzmB not directly validated in this study","pmids":["26166761"],"is_preprint":false},{"year":2017,"finding":"GZMB QPY/RAH polymorphism (rs8192917; Q48R) influences NK cell cytotoxicity. R48-GzmB accumulates to similar protein levels as Q48-GzmB in activated NK cells, indicating the functional difference is not due to altered protein stability or expression but affects cytotoxic activity.","method":"NK cell cytotoxicity assays, degranulation assays, GzmB protein quantification in human donors stratified by rs8192917 genotype","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional NK cytotoxicity assay stratified by genotype in human donors, single lab, no structural/enzymatic reconstitution","pmids":["28653095"],"is_preprint":false},{"year":2021,"finding":"miR-518a-5p binds directly to the 3'UTR of GZMB and negatively regulates GZMB expression. Overexpression of miR-518a-5p mimic reduces GZMB protein levels and attenuates apoptosis in hypoxia/reoxygenation-injured vascular endothelial cells.","method":"Luciferase 3'UTR reporter assay, miRNA mimic transfection, Western blot, cell viability (CCK8) assay in HUVEC cells","journal":"International heart journal","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, direct 3'UTR binding validated by luciferase assay, functional consequence in a single cell model","pmids":["33994508"],"is_preprint":false},{"year":2022,"finding":"TCF-1B (Tcf-1) expression in CD8+ T cells restricts acquisition of a GzmB-high state and protects T cells from activation-induced cell death (AICD) associated with elicitation of effector function. Constitutive TCF-1B expression reduced GzmB expression and improved survival of TCR-engineered CD8+ T cells upon tumor engagement.","method":"Constitutive Tcf-1B expression in primary CD8+ T cells, in vitro and xenograft tumor models, flow cytometry for GzmB and apoptosis markers","journal":"Cancer immunology, immunotherapy : CII","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional in vivo and in vitro data with GzmB as direct downstream target of Tcf-1B, single lab","pmids":["35460379"],"is_preprint":false},{"year":2023,"finding":"GZMB activates caspase-3, which in turn cleaves Gasdermin E (GSDME), promoting pyroptosis in rheumatoid arthritis fibroblast-like synoviocytes. Silencing GZMB with siRNA reduces caspase-3 activation, GSDME cleavage, LDH release, and inflammatory cytokines IL-1β and IL-18 in HFLS-RA and MH7A cells.","method":"GZMB siRNA knockdown in RA cells, Western blot for caspase-3/GSDME/GZMB, LDH assay, ELISA for cytokines, CCK8/EDU proliferation assays","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — pathway placement via knockdown with multiple downstream readouts, single lab, no reconstitution of direct GZMB-caspase-3-GSDME cleavage","pmids":["37531918"],"is_preprint":false},{"year":2024,"finding":"CRISPR-Cas9 knockout of GZMB (as well as PRF1, IFNγ, or LYST, but not IL4 or IL5) in primary human CD8+ T cells significantly diminishes their in vitro immune suppressive ability, establishing GZMB as necessary for CD8+ T cell-mediated immune suppression.","method":"CRISPR-Cas9 gene knockout in primary human CD8+ T cells, qRT-PCR confirmation, flow cytometry, in vitro suppression assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean CRISPR knockout with specific phenotypic readout, confirmed at genomic and protein level, tested against multiple gene controls","pmids":["38607279"],"is_preprint":false},{"year":2024,"finding":"Inhibition of GZMB activity with SerpinA3N in diabetic mice reduces endoplasmic reticulum stress (PERK/eIF2α pathway) and pyroptosis (NLRP3/Caspase-1/GSDMD-N/IL-1β/IL-18) in hippocampal oligodendrocytes, reduces demyelination, and ameliorates diabetic cognitive dysfunction.","method":"In vivo GZMB inhibitor (SerpinA3N) treatment in diabetic mice, Morris water maze, immunofluorescence, Western blot for ER stress/pyroptosis markers, Luxol Fast Blue staining","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo pharmacological inhibition with multiple mechanistic readouts linking GZMB to ER stress and pyroptosis in oligodendrocytes, single lab","pmids":["39326683"],"is_preprint":false},{"year":2025,"finding":"GZMB directly recognizes and cleaves SDC1 (syndecan-1) at valine 225 and aspartate 228, blocking autophagosome-lysosome fusion in glioblastoma cells. Cleavage of SDC1 by GZMB obstructs localization of TGM2 (a MAP1LC3/LC3 recognizer) on the lysosome surface, impairing autophagosome maturation and thereby radiosensitizing GBM cells. An uncleavable SDC1 mutant reverses GZMB-mediated radiosensitization.","method":"In vitro GZMB cleavage assay with SDC1 substrate, site-directed mutagenesis of SDC1 cleavage sites, co-culture NK-GBM experiments, xenograft model, autophagy flux assays, TGM2 localization imaging","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct substrate cleavage demonstrated with mutagenesis validation (uncleavable mutant reversal), functional in vitro and in vivo confirmation, single lab but multiple orthogonal methods","pmids":["41378763"],"is_preprint":false},{"year":2025,"finding":"In tumor-infiltrating CD4+ T cells, Gzmb mRNA is abundant but GzmB protein is absent (poised state), indicating a post-transcriptional block to GzmB protein production. The RNA-binding proteins ZFP36 and ZFP36L1 maintain this block. Anti-CTLA-4 or anti-LAG-3 plus anti-PD-1 treatment relieves this block by repressing ZFP36L1 expression. Constitutive ZFP36L1 expression abrogates anti-CTLA-4 effects; deletion of ZFP36 and ZFP36L1 triggers GzmB protein production and promotes tumor control.","method":"Genetic deletion of Zfp36/Zfp36l1 in mouse T cells, constitutive ZFP36L1 expression, immune checkpoint blockade experiments, RNA vs. protein quantification in tumor-infiltrating T cells","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with double knockout and rescue, direct mRNA/protein dissociation measured, preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"IFNγ is stored within GzmB-containing cytotoxic granules (CGs) in activated mouse and human CD8+ T cells ('lytic IFNγ') and is co-secreted with GzmB at the immunological synapse in both soluble and SMAP-associated forms. Mouse CD8+ T cells lacking the vesicle priming factor Munc13-4 exhibit impaired co-secretion of both CG contents and early IFNγ at the synapse.","method":"Super-resolution imaging, vesicle priming factor knockout (Munc13-4-/- mice), immunological synapse formation assays, co-localization of IFNγ and GzmB in granules","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-localization with super-resolution imaging and genetic validation with Munc13-4 knockout, preprint not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"GZMB encodes a serine protease stored in cytotoxic granules of CD8+ T cells and NK cells whose transcription is activated by synergistic AP-1/CRE elements in response to T cell receptor or IL-2 signaling; once delivered into target cells, GZMB triggers apoptosis primarily through caspase-3/-7-dependent pathways (and secondarily through Bid/Bak/Bax), can cleave extracellular substrates such as SDC1 to block autophagosome maturation, and activates the GZMB–caspase-3–GSDME axis to drive pyroptosis; its expression and activity are post-transcriptionally regulated by miRNAs (miR-27a*, miR-378, miR-518a-5p) and by the RNA-binding proteins ZFP36/ZFP36L1, while at the protein level it can be degraded by hypoxia-induced autophagy in target cells, and its function is required for CD8+ T cell-mediated immune suppression."},"narrative":{"mechanistic_narrative":"GZMB encodes a cytotoxic-lymphocyte-specific serine protease whose gene organization places each catalytic-triad residue (His, Asp, Ser) on a separate exon, defining it as a member of a distinct serine protease subfamily [PMID:3264185]. Its transcription is restricted to activated cytotoxic T lymphocytes and is driven by 5'-flanking regulatory sequences that respond to both T-cell receptor and IL-2 receptor signaling [PMID:1761544], requiring obligate synergy between an AP-1 element and a CRE held in fixed helical register [PMID:8219227]. Once delivered into target cells, GZMB kills primarily through a caspase-3/-7-dependent apoptotic program, with the Bid/Bak/Bax axis serving only a secondary role [PMID:19838298], and it can also activate caspase-3 to cleave Gasdermin E and drive pyroptosis [PMID:37531918]. Beyond canonical death pathways, GZMB directly cleaves the extracellular substrate SDC1 at Val225/Asp228, displacing TGM2 from the lysosome surface to block autophagosome-lysosome fusion [PMID:41378763]. GZMB is genetically required for CD8+ T cell-mediated immune suppression [PMID:38607279]. Its output is heavily constrained at multiple post-transcriptional levels: by miRNAs that bind the GZMB 3'UTR (miR-27a*, miR-518a-5p) to limit cytotoxicity [PMID:21960590, PMID:33994508], by the RNA-binding proteins ZFP36/ZFP36L1 that hold abundant Gzmb mRNA in a translationally poised state in tumor-infiltrating CD4+ T cells, and at the protein level by hypoxia-induced autophagy in target cells that degrades delivered GZMB to evade killing [PMID:24248158].","teleology":[{"year":1988,"claim":"Established that GZMB is a cytotoxic T-lymphocyte serine protease, with exon organization confirming a catalytic triad and defining a new serine protease subfamily.","evidence":"Gene isolation, sequencing, and structural analysis of active-site exon organization","pmids":["3264185"],"confidence":"High","gaps":["Catalytic mechanism inferred from sequence, not enzymatically reconstituted","No substrate identified at this stage"]},{"year":1993,"claim":"Resolved the cis-regulatory logic of GZMB induction, showing CTL-restricted transcription requires synergistic, spacing-constrained AP-1 and CRE elements responsive to TCR and IL-2 signaling.","evidence":"Promoter deletion mapping, DNase I hypersensitivity, transgenic reporter, and site-directed mutagenesis with reporter readouts in T-cell lines and mice","pmids":["2233710","1761544","8219227"],"confidence":"High","gaps":["Identity of the trans-acting factors binding AP-1/CRE not fixed","Does not address post-transcriptional control"]},{"year":2009,"claim":"Defined the dominant death pathway downstream of delivered GZMB, showing caspase-3/-7 are required while the Bid/Bak/Bax route is secondary, using viral replication control as readout.","evidence":"Ex vivo CTL assays with GzmAxB-/- and caspase-deficient target cells, viral titer measurement","pmids":["19838298"],"confidence":"High","gaps":["Direct GZMB substrate(s) feeding caspase activation not enumerated here","Relative contribution may differ across cell types"]},{"year":2013,"claim":"Showed GZMB function is limited not only by expression but by target-cell defenses, as hypoxia-induced autophagy degrades NK-delivered GZMB to block killing.","evidence":"Autophagy inhibition, NK cytotoxicity assays, GZMB detection, and in vivo tumor model in breast cancer cells","pmids":["24248158"],"confidence":"High","gaps":["Molecular machinery selecting GZMB for autophagic degradation not defined","Whether other granzymes are similarly degraded unknown"]},{"year":2021,"claim":"Extended post-transcriptional regulation of GZMB by miRNAs, identifying 3'UTR-binding miR-27a* and miR-518a-5p as direct negative regulators tuning cytotoxic output.","evidence":"3'UTR luciferase reporter assays, miRNA knockdown/overexpression, NK cytotoxicity and HUVEC viability assays, xenograft model","pmids":["21960590","33994508"],"confidence":"Medium","gaps":["Physiological contexts where each miRNA dominates not delineated","Combinatorial effects with other regulators untested"]},{"year":2023,"claim":"Placed GZMB upstream of pyroptosis, showing it activates caspase-3 to cleave Gasdermin E and release inflammatory cytokines in synoviocytes.","evidence":"GZMB siRNA knockdown with caspase-3/GSDME Western blot, LDH and cytokine assays in RA cell lines","pmids":["37531918"],"confidence":"Medium","gaps":["Direct GZMB-caspase-3-GSDME cleavage not reconstituted","Single cell-type, knockdown-based pathway placement"]},{"year":2024,"claim":"Demonstrated GZMB is genetically necessary for CD8+ T cell-mediated immune suppression, distinguishing it from non-required effector molecules.","evidence":"CRISPR-Cas9 knockout of GZMB versus control genes in primary human CD8+ T cells with in vitro suppression assays","pmids":["38607279"],"confidence":"High","gaps":["Mechanism by which GZMB enacts suppression not resolved","Target cells of suppression not defined"]},{"year":2025,"claim":"Identified a direct extracellular substrate, showing GZMB cleaves SDC1 to displace TGM2 and block autophagosome maturation, linking GZMB to autophagy modulation and radiosensitization.","evidence":"In vitro cleavage assay, SDC1 cleavage-site mutagenesis with uncleavable-mutant rescue, NK-GBM co-culture, xenograft, autophagy flux and TGM2 imaging","pmids":["41378763"],"confidence":"High","gaps":["Scope of additional extracellular substrates unknown","Generality beyond glioblastoma untested"]},{"year":2025,"claim":"Revealed a translational checkpoint on GZMB, where ZFP36/ZFP36L1 hold abundant Gzmb mRNA in a protein-null poised state that checkpoint blockade can relieve.","evidence":"Zfp36/Zfp36l1 deletion and constitutive ZFP36L1 expression in mouse T cells, checkpoint blockade, mRNA versus protein quantification (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Direct ZFP36-family binding to Gzmb mRNA not biochemically mapped here"]},{"year":null,"claim":"How the multiple layers of GZMB regulation — transcriptional synergy, miRNA control, ZFP36-mediated translational poising, and target-cell autophagic degradation — are integrated to set effective protease delivery in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking regulatory layers","Full extracellular and intracellular substrate repertoire incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,14]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,14]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[16]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6,14]}],"complexes":["cytotoxic granule"],"partners":["SDC1","CASP3","GSDME"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P10144","full_name":"Granzyme B","aliases":["C11","CTLA-1","Cathepsin G-like 1","CTSGL1","Cytotoxic T-lymphocyte proteinase 2","Lymphocyte protease","Fragmentin-2","Granzyme-2","Human lymphocyte protein","HLP","SECT","T-cell serine protease 1-3E"],"length_aa":247,"mass_kda":27.7,"function":"Abundant protease in the cytosolic granules of cytotoxic T-cells and NK-cells which activates caspase-independent pyroptosis when delivered into the target cell through the immunological synapse (PubMed:1985927, PubMed:3262682, PubMed:3263427). It cleaves after Asp (PubMed:1985927, PubMed:8258716). Once delivered into the target cell, acts by catalyzing cleavage of gasdermin-E (GSDME), releasing the pore-forming moiety of GSDME, thereby triggering pyroptosis and target cell death (PubMed:31953257, PubMed:32188940). Seems to be linked to an activation cascade of caspases (aspartate-specific cysteine proteases) responsible for apoptosis execution. Cleaves caspase-3, -9 and -10 (CASP3, CASP9 and CASP10, respectively) to give rise to active enzymes mediating apoptosis (PubMed:9852092). Cleaves and activates CASP7 in response to bacterial infection, promoting plasma membrane repair (By similarity)","subcellular_location":"Secreted; Cytolytic granule","url":"https://www.uniprot.org/uniprotkb/P10144/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GZMB","classification":"Not Classified","n_dependent_lines":38,"n_total_lines":1208,"dependency_fraction":0.03145695364238411},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GZMB","total_profiled":1310},"omim":[{"mim_id":"613931","title":"TARGET OF EGR1; TOE1","url":"https://www.omim.org/entry/613931"},{"mim_id":"611550","title":"NATURAL CYTOTOXICITY TRIGGERING RECEPTOR 3; NCR3","url":"https://www.omim.org/entry/611550"},{"mim_id":"611195","title":"JANUS KINASE AND MICROTUBULE-INTERACTING PROTEIN 1; JAKMIP1","url":"https://www.omim.org/entry/611195"},{"mim_id":"610872","title":"RING FINGER PROTEIN 19B; RNF19B","url":"https://www.omim.org/entry/610872"},{"mim_id":"610379","title":"WEST NILE VIRUS, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/610379"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Calyx","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":62.9},{"tissue":"lung","ntpm":15.7},{"tissue":"lymphoid tissue","ntpm":33.8},{"tissue":"urinary bladder","ntpm":17.2}],"url":"https://www.proteinatlas.org/search/GZMB"},"hgnc":{"alias_symbol":["CCPI","CGL-1","CSP-B","CGL1","CTSGL1","HLP","SECT"],"prev_symbol":["CTLA1","CSPB"]},"alphafold":{"accession":"P10144","domains":[{"cath_id":"2.40.10.10","chopping":"34-127_238-247","consensus_level":"medium","plddt":97.2791,"start":34,"end":247},{"cath_id":"2.40.10.10","chopping":"141-235","consensus_level":"medium","plddt":95.8773,"start":141,"end":235}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P10144","model_url":"https://alphafold.ebi.ac.uk/files/AF-P10144-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P10144-F1-predicted_aligned_error_v6.png","plddt_mean":92.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GZMB","jax_strain_url":"https://www.jax.org/strain/search?query=GZMB"},"sequence":{"accession":"P10144","fasta_url":"https://rest.uniprot.org/uniprotkb/P10144.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P10144/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P10144"}},"corpus_meta":[{"pmid":"37963457","id":"PMC_37963457","title":"Single-cell atlas of healthy human blood unveils age-related loss of NKG2C+GZMB-CD8+ memory T cells and accumulation of type 2 memory T cells.","date":"2023","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/37963457","citation_count":134,"is_preprint":false},{"pmid":"21960590","id":"PMC_21960590","title":"Human microRNA-27a* targets Prf1 and GzmB expression to regulate NK-cell cytotoxicity.","date":"2011","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/21960590","citation_count":116,"is_preprint":false},{"pmid":"11500134","id":"PMC_11500134","title":"Production of delayed death and neoplastic transformation in CGL1 cells by radiation-induced bystander effects.","date":"2001","source":"Radiation research","url":"https://pubmed.ncbi.nlm.nih.gov/11500134","citation_count":80,"is_preprint":false},{"pmid":"24248158","id":"PMC_24248158","title":"Autophagic degradation of GZMB/granzyme B: a new mechanism of hypoxic tumor cell escape from natural killer cell-mediated lysis.","date":"2013","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/24248158","citation_count":71,"is_preprint":false},{"pmid":"3264185","id":"PMC_3264185","title":"Organization of two genes encoding cytotoxic T lymphocyte-specific serine proteases CCPI and CCPII.","date":"1988","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/3264185","citation_count":46,"is_preprint":false},{"pmid":"14551783","id":"PMC_14551783","title":"Re-evaluation of the RBE of 29 kV x-rays (mammography x-rays) relative to 220 kV x-rays using neoplastic transformation of human CGL1-hybrid cells.","date":"2003","source":"Radiation and environmental biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/14551783","citation_count":46,"is_preprint":false},{"pmid":"26166761","id":"PMC_26166761","title":"Suppressed expression of miR-378 targeting gzmb in NK cells is required to control dengue virus infection.","date":"2015","source":"Cellular & molecular 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Two introns occur in unusual positions: one within the activation dipeptide and one near the active-site Asp residue in the invariant core region, defining GZMB as a member of a new subfamily of serine protease genes.\",\n      \"method\": \"Gene isolation, sequencing, and structural analysis of coding/noncoding regions\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct gene sequencing with structural characterization of active-site exon organization, foundational mechanism paper\",\n      \"pmids\": [\"3264185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"The CSP-B/GZMB gene is transcriptionally activated during cytotoxic T-lymphocyte maturation. TPA and bt2cAMP act synergistically to induce transcription; neither agent alone is sufficient. A DNase I-hypersensitive site forms upstream upon activation, and two regulatory regions at -609 to -202 and -202 to -80 relative to the transcriptional start site drive activation.\",\n      \"method\": \"Transient transfection of promoter constructs, DNase I hypersensitivity assay, RNA analysis in PEER T-cell line\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (chromatin accessibility, promoter deletion mapping, transfection) in a single study\",\n      \"pmids\": [\"2233710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The 5'-flanking region of the human CSP-B/GZMB gene is sufficient to target expression specifically to activated T-lymphocytes in vivo; expression is induced by T-cell receptor signaling (concanavalin A) or IL-2 receptor signaling, demonstrating that GZMB regulatory sequences are responsive to both activation pathways.\",\n      \"method\": \"Transgenic mouse reporter assay (human growth hormone driven by CSP-B promoter), T-cell activation experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic model with functional promoter validation and multiple activation conditions tested\",\n      \"pmids\": [\"1761544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Transcriptional activation of GZMB requires synergy between a consensus AP-1 element and a consensus CRE located 5' to the transcriptional start site. Single nucleotide substitutions in the AP-1 site abolish activity; point mutations in the CRE substantially reduce activity. Replacing the CRE with a second AP-1 site preserves activity, but replacing the AP-1 site with a CRE abolishes activity. Helical spacing between the two elements must be preserved for full synergism, indicating cooperative protein-DNA or protein-protein interactions.\",\n      \"method\": \"Transient transfection with promoter mutants, luciferase/reporter assays in TPA+bt2cAMP-stimulated PEER cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic site-directed mutagenesis of regulatory elements with functional readout, multiple orthogonal mutations tested\",\n      \"pmids\": [\"8219227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GzmB controls ectromelia (mousepox) virus replication through a caspase-3/-7-dependent mechanism. GzmB-induced apoptosis in virus-infected cells is completely blocked when caspase-3/-7 are absent. The Bid/Bak/Bax pathway activated by GzmB is only partially inhibited by virus and does not account for viral replication control; inhibition of viral replication in vitro requires caspase-3/-7 activity downstream of GzmB.\",\n      \"method\": \"Ex vivo cytotoxic T cell assays using granzyme-deficient (GzmAxB-/-) and caspase-deficient target cells, viral titer measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic dissection with multiple knockout combinations, functional viral titer readout, orthogonal apoptosis assays\",\n      \"pmids\": [\"19838298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human miR-27a* negatively regulates NK-cell cytotoxicity by directly binding to the 3' UTR of both Prf1 and GzmB mRNAs, down-regulating their expression in resting and activated NK cells. Knockdown of miR-27a* dramatically increases NK cytotoxicity in vitro and decreases tumor growth in a xenograft model.\",\n      \"method\": \"3'UTR reporter assays, miRNA knockdown/overexpression in primary NK cells, in vitro cytotoxicity assays, xenograft tumor model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct 3'UTR binding validation, functional NK cytotoxicity assays, in vivo xenograft confirmation\",\n      \"pmids\": [\"21960590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hypoxia-induced autophagy in breast cancer cells selectively degrades GZMB delivered by NK cells, thereby blocking NK-mediated apoptosis of target cells. Inhibiting autophagy restores susceptibility to NK-mediated lysis and promotes tumor regression in vivo.\",\n      \"method\": \"Autophagy inhibition experiments, in vitro NK cytotoxicity assays, GZMB detection in hypoxic cells, in vivo tumor model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic linkage between autophagy, GZMB degradation, and NK killing established with both in vitro and in vivo evidence\",\n      \"pmids\": [\"24248158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-378 suppresses GzmB expression in NK cells during dengue virus infection. Overexpression of miR-378 in DENV-infected mice inhibited GzmB expression and promoted DENV replication, establishing that suppression of miR-378 is required for GzmB-mediated control of dengue virus.\",\n      \"method\": \"miRNA agomir overexpression in DENV-infected mice, GzmB expression measurement, viral replication assays\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo mouse experiment with functional readout but single lab, and 3'UTR binding of miR-378 to GzmB not directly validated in this study\",\n      \"pmids\": [\"26166761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GZMB QPY/RAH polymorphism (rs8192917; Q48R) influences NK cell cytotoxicity. R48-GzmB accumulates to similar protein levels as Q48-GzmB in activated NK cells, indicating the functional difference is not due to altered protein stability or expression but affects cytotoxic activity.\",\n      \"method\": \"NK cell cytotoxicity assays, degranulation assays, GzmB protein quantification in human donors stratified by rs8192917 genotype\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional NK cytotoxicity assay stratified by genotype in human donors, single lab, no structural/enzymatic reconstitution\",\n      \"pmids\": [\"28653095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-518a-5p binds directly to the 3'UTR of GZMB and negatively regulates GZMB expression. Overexpression of miR-518a-5p mimic reduces GZMB protein levels and attenuates apoptosis in hypoxia/reoxygenation-injured vascular endothelial cells.\",\n      \"method\": \"Luciferase 3'UTR reporter assay, miRNA mimic transfection, Western blot, cell viability (CCK8) assay in HUVEC cells\",\n      \"journal\": \"International heart journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, direct 3'UTR binding validated by luciferase assay, functional consequence in a single cell model\",\n      \"pmids\": [\"33994508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TCF-1B (Tcf-1) expression in CD8+ T cells restricts acquisition of a GzmB-high state and protects T cells from activation-induced cell death (AICD) associated with elicitation of effector function. Constitutive TCF-1B expression reduced GzmB expression and improved survival of TCR-engineered CD8+ T cells upon tumor engagement.\",\n      \"method\": \"Constitutive Tcf-1B expression in primary CD8+ T cells, in vitro and xenograft tumor models, flow cytometry for GzmB and apoptosis markers\",\n      \"journal\": \"Cancer immunology, immunotherapy : CII\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional in vivo and in vitro data with GzmB as direct downstream target of Tcf-1B, single lab\",\n      \"pmids\": [\"35460379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GZMB activates caspase-3, which in turn cleaves Gasdermin E (GSDME), promoting pyroptosis in rheumatoid arthritis fibroblast-like synoviocytes. Silencing GZMB with siRNA reduces caspase-3 activation, GSDME cleavage, LDH release, and inflammatory cytokines IL-1β and IL-18 in HFLS-RA and MH7A cells.\",\n      \"method\": \"GZMB siRNA knockdown in RA cells, Western blot for caspase-3/GSDME/GZMB, LDH assay, ELISA for cytokines, CCK8/EDU proliferation assays\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — pathway placement via knockdown with multiple downstream readouts, single lab, no reconstitution of direct GZMB-caspase-3-GSDME cleavage\",\n      \"pmids\": [\"37531918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CRISPR-Cas9 knockout of GZMB (as well as PRF1, IFNγ, or LYST, but not IL4 or IL5) in primary human CD8+ T cells significantly diminishes their in vitro immune suppressive ability, establishing GZMB as necessary for CD8+ T cell-mediated immune suppression.\",\n      \"method\": \"CRISPR-Cas9 gene knockout in primary human CD8+ T cells, qRT-PCR confirmation, flow cytometry, in vitro suppression assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR knockout with specific phenotypic readout, confirmed at genomic and protein level, tested against multiple gene controls\",\n      \"pmids\": [\"38607279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Inhibition of GZMB activity with SerpinA3N in diabetic mice reduces endoplasmic reticulum stress (PERK/eIF2α pathway) and pyroptosis (NLRP3/Caspase-1/GSDMD-N/IL-1β/IL-18) in hippocampal oligodendrocytes, reduces demyelination, and ameliorates diabetic cognitive dysfunction.\",\n      \"method\": \"In vivo GZMB inhibitor (SerpinA3N) treatment in diabetic mice, Morris water maze, immunofluorescence, Western blot for ER stress/pyroptosis markers, Luxol Fast Blue staining\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo pharmacological inhibition with multiple mechanistic readouts linking GZMB to ER stress and pyroptosis in oligodendrocytes, single lab\",\n      \"pmids\": [\"39326683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GZMB directly recognizes and cleaves SDC1 (syndecan-1) at valine 225 and aspartate 228, blocking autophagosome-lysosome fusion in glioblastoma cells. Cleavage of SDC1 by GZMB obstructs localization of TGM2 (a MAP1LC3/LC3 recognizer) on the lysosome surface, impairing autophagosome maturation and thereby radiosensitizing GBM cells. An uncleavable SDC1 mutant reverses GZMB-mediated radiosensitization.\",\n      \"method\": \"In vitro GZMB cleavage assay with SDC1 substrate, site-directed mutagenesis of SDC1 cleavage sites, co-culture NK-GBM experiments, xenograft model, autophagy flux assays, TGM2 localization imaging\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct substrate cleavage demonstrated with mutagenesis validation (uncleavable mutant reversal), functional in vitro and in vivo confirmation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"41378763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In tumor-infiltrating CD4+ T cells, Gzmb mRNA is abundant but GzmB protein is absent (poised state), indicating a post-transcriptional block to GzmB protein production. The RNA-binding proteins ZFP36 and ZFP36L1 maintain this block. Anti-CTLA-4 or anti-LAG-3 plus anti-PD-1 treatment relieves this block by repressing ZFP36L1 expression. Constitutive ZFP36L1 expression abrogates anti-CTLA-4 effects; deletion of ZFP36 and ZFP36L1 triggers GzmB protein production and promotes tumor control.\",\n      \"method\": \"Genetic deletion of Zfp36/Zfp36l1 in mouse T cells, constitutive ZFP36L1 expression, immune checkpoint blockade experiments, RNA vs. protein quantification in tumor-infiltrating T cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with double knockout and rescue, direct mRNA/protein dissociation measured, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFNγ is stored within GzmB-containing cytotoxic granules (CGs) in activated mouse and human CD8+ T cells ('lytic IFNγ') and is co-secreted with GzmB at the immunological synapse in both soluble and SMAP-associated forms. Mouse CD8+ T cells lacking the vesicle priming factor Munc13-4 exhibit impaired co-secretion of both CG contents and early IFNγ at the synapse.\",\n      \"method\": \"Super-resolution imaging, vesicle priming factor knockout (Munc13-4-/- mice), immunological synapse formation assays, co-localization of IFNγ and GzmB in granules\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-localization with super-resolution imaging and genetic validation with Munc13-4 knockout, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"GZMB encodes a serine protease stored in cytotoxic granules of CD8+ T cells and NK cells whose transcription is activated by synergistic AP-1/CRE elements in response to T cell receptor or IL-2 signaling; once delivered into target cells, GZMB triggers apoptosis primarily through caspase-3/-7-dependent pathways (and secondarily through Bid/Bak/Bax), can cleave extracellular substrates such as SDC1 to block autophagosome maturation, and activates the GZMB–caspase-3–GSDME axis to drive pyroptosis; its expression and activity are post-transcriptionally regulated by miRNAs (miR-27a*, miR-378, miR-518a-5p) and by the RNA-binding proteins ZFP36/ZFP36L1, while at the protein level it can be degraded by hypoxia-induced autophagy in target cells, and its function is required for CD8+ T cell-mediated immune suppression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GZMB encodes a cytotoxic-lymphocyte-specific serine protease whose gene organization places each catalytic-triad residue (His, Asp, Ser) on a separate exon, defining it as a member of a distinct serine protease subfamily [#0]. Its transcription is restricted to activated cytotoxic T lymphocytes and is driven by 5'-flanking regulatory sequences that respond to both T-cell receptor and IL-2 receptor signaling [#2], requiring obligate synergy between an AP-1 element and a CRE held in fixed helical register [#3]. Once delivered into target cells, GZMB kills primarily through a caspase-3/-7-dependent apoptotic program, with the Bid/Bak/Bax axis serving only a secondary role [#4], and it can also activate caspase-3 to cleave Gasdermin E and drive pyroptosis [#11]. Beyond canonical death pathways, GZMB directly cleaves the extracellular substrate SDC1 at Val225/Asp228, displacing TGM2 from the lysosome surface to block autophagosome-lysosome fusion [#14]. GZMB is genetically required for CD8+ T cell-mediated immune suppression [#12]. Its output is heavily constrained at multiple post-transcriptional levels: by miRNAs that bind the GZMB 3'UTR (miR-27a*, miR-518a-5p) to limit cytotoxicity [#5, #9], by the RNA-binding proteins ZFP36/ZFP36L1 that hold abundant Gzmb mRNA in a translationally poised state in tumor-infiltrating CD4+ T cells [#15], and at the protein level by hypoxia-induced autophagy in target cells that degrades delivered GZMB to evade killing [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Established that GZMB is a cytotoxic T-lymphocyte serine protease, with exon organization confirming a catalytic triad and defining a new serine protease subfamily.\",\n      \"evidence\": \"Gene isolation, sequencing, and structural analysis of active-site exon organization\",\n      \"pmids\": [\"3264185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism inferred from sequence, not enzymatically reconstituted\", \"No substrate identified at this stage\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Resolved the cis-regulatory logic of GZMB induction, showing CTL-restricted transcription requires synergistic, spacing-constrained AP-1 and CRE elements responsive to TCR and IL-2 signaling.\",\n      \"evidence\": \"Promoter deletion mapping, DNase I hypersensitivity, transgenic reporter, and site-directed mutagenesis with reporter readouts in T-cell lines and mice\",\n      \"pmids\": [\"2233710\", \"1761544\", \"8219227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the trans-acting factors binding AP-1/CRE not fixed\", \"Does not address post-transcriptional control\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the dominant death pathway downstream of delivered GZMB, showing caspase-3/-7 are required while the Bid/Bak/Bax route is secondary, using viral replication control as readout.\",\n      \"evidence\": \"Ex vivo CTL assays with GzmAxB-/- and caspase-deficient target cells, viral titer measurement\",\n      \"pmids\": [\"19838298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GZMB substrate(s) feeding caspase activation not enumerated here\", \"Relative contribution may differ across cell types\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed GZMB function is limited not only by expression but by target-cell defenses, as hypoxia-induced autophagy degrades NK-delivered GZMB to block killing.\",\n      \"evidence\": \"Autophagy inhibition, NK cytotoxicity assays, GZMB detection, and in vivo tumor model in breast cancer cells\",\n      \"pmids\": [\"24248158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular machinery selecting GZMB for autophagic degradation not defined\", \"Whether other granzymes are similarly degraded unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended post-transcriptional regulation of GZMB by miRNAs, identifying 3'UTR-binding miR-27a* and miR-518a-5p as direct negative regulators tuning cytotoxic output.\",\n      \"evidence\": \"3'UTR luciferase reporter assays, miRNA knockdown/overexpression, NK cytotoxicity and HUVEC viability assays, xenograft model\",\n      \"pmids\": [\"21960590\", \"33994508\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts where each miRNA dominates not delineated\", \"Combinatorial effects with other regulators untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Placed GZMB upstream of pyroptosis, showing it activates caspase-3 to cleave Gasdermin E and release inflammatory cytokines in synoviocytes.\",\n      \"evidence\": \"GZMB siRNA knockdown with caspase-3/GSDME Western blot, LDH and cytokine assays in RA cell lines\",\n      \"pmids\": [\"37531918\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GZMB-caspase-3-GSDME cleavage not reconstituted\", \"Single cell-type, knockdown-based pathway placement\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated GZMB is genetically necessary for CD8+ T cell-mediated immune suppression, distinguishing it from non-required effector molecules.\",\n      \"evidence\": \"CRISPR-Cas9 knockout of GZMB versus control genes in primary human CD8+ T cells with in vitro suppression assays\",\n      \"pmids\": [\"38607279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which GZMB enacts suppression not resolved\", \"Target cells of suppression not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a direct extracellular substrate, showing GZMB cleaves SDC1 to displace TGM2 and block autophagosome maturation, linking GZMB to autophagy modulation and radiosensitization.\",\n      \"evidence\": \"In vitro cleavage assay, SDC1 cleavage-site mutagenesis with uncleavable-mutant rescue, NK-GBM co-culture, xenograft, autophagy flux and TGM2 imaging\",\n      \"pmids\": [\"41378763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Scope of additional extracellular substrates unknown\", \"Generality beyond glioblastoma untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a translational checkpoint on GZMB, where ZFP36/ZFP36L1 hold abundant Gzmb mRNA in a protein-null poised state that checkpoint blockade can relieve.\",\n      \"evidence\": \"Zfp36/Zfp36l1 deletion and constitutive ZFP36L1 expression in mouse T cells, checkpoint blockade, mRNA versus protein quantification (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Direct ZFP36-family binding to Gzmb mRNA not biochemically mapped here\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple layers of GZMB regulation — transcriptional synergy, miRNA control, ZFP36-mediated translational poising, and target-cell autophagic degradation — are integrated to set effective protease delivery in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking regulatory layers\", \"Full extracellular and intracellular substrate repertoire incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 14]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6, 14]}\n    ],\n    \"complexes\": [\"cytotoxic granule\"],\n    \"partners\": [\"SDC1\", \"CASP3\", \"GSDME\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}