{"gene":"GZMH","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1986,"finding":"CTLA-1 (mouse ortholog of GZMH-related serine esterase) was identified as a transcript specifically induced in cytotoxic T lymphocytes, with its protein sequence showing homology to serine esterases, and the gene was mapped to mouse chromosome 14.","method":"Differential cDNA library screening, sequence analysis, chromosomal in situ hybridization","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 — foundational cloning and sequence characterization; single study but multiple orthogonal methods","pmids":["3090449"],"is_preprint":false},{"year":1988,"finding":"The human homolog of CTLA-1 (GZMH precursor) was mapped to chromosome 14q11-q12, in close proximity to the T-cell receptor alpha gene locus, with gene order established as centromere-NP-1-TCRα-CTLA-1.","method":"In situ hybridization, pulsed field gel electrophoresis, restriction fragment length polymorphism genetic linkage","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal mapping methods in a single study","pmids":["3182016"],"is_preprint":false},{"year":1990,"finding":"GZMH (as CSP-C/CGL-2) was identified as a novel human cytotoxic lymphocyte-specific serine protease with a 246-amino acid prepropeptide structure containing the catalytic charge relay system characteristic of serine proteases; it shares 71% amino acid identity with CSP-B/granzyme B and 57% with cathepsin G. The gene is located on chromosome 14q11 within a cluster including CSP-B and cathepsin G.","method":"cDNA library screening, sequence analysis, Northern blot expression analysis","journal":"Tissue antigens","confidence":"Medium","confidence_rationale":"Tier 2 — molecular cloning with sequence and expression characterization","pmids":["2402757"],"is_preprint":false},{"year":1990,"finding":"CGL-2 (GZMH) and cathepsin G and CGL-1 genes are clustered within an approximately 50-kb locus on human chromosome 14q11.2, the same chromosomal band as the alpha and delta T-cell receptor genes; CGL-2 is expressed at lower levels than CGL-1 in activated peripheral blood lymphocytes, LAK and NK cells.","method":"Genomic library cloning, Southern blotting, chromosomal mapping, Northern blot","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods for genomic and expression characterization","pmids":["2300587"],"is_preprint":false},{"year":1991,"finding":"Granzyme H gene structure consists of 5 exons and 4 introns (same organization as granzyme B and cathepsin G), and evolutionary analysis revealed that interlocus recombination between ancestral granzyme B and granzyme H genes occurred approximately 21 million years ago, replacing exon 3, intron 3, and part of exon 4 in granzyme H with granzyme B sequences. Granzyme H is more closely related to cathepsin G and granzyme B than to murine granzymes C–G.","method":"Gene sequencing, phylogenetic tree reconstruction, comparative genomics","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 — complete gene sequencing with evolutionary analysis","pmids":["2049336"],"is_preprint":false},{"year":1991,"finding":"CGL-2 (GZMH) has the same 5-exon/4-intron gene organization as cathepsin G and CGL-1, with identical intron splice phases; the 5' flanking regions of CGL-1 and CGL-2 are minimally related, suggesting distinct cis-regulatory elements drive their differential lineage-specific expression.","method":"Gene sequencing, structural comparison, Northern blot expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — comparative gene structure analysis with expression profiling","pmids":["2007574"],"is_preprint":false},{"year":1999,"finding":"Recombinant granzyme H has chymotrypsin-like (chymase) activity, efficiently cleaving Suc-Phe-Leu-Phe-SBzl and Boc-Ala-Ala-X-SBzl substrates with preference for Phe, Tyr, Met, Nle, or Nva at the P1 position; activity was inhibited by 3,4-dichloroisocoumarin and PMSF. Fluorescein-labeled granzyme H was internalized by Jurkat cells into endosome-like vesicles in a temperature-dependent manner, suggesting cell-surface receptor binding similar to granzyme B.","method":"Baculovirus recombinant protein expression, enzymatic substrate cleavage assays, fluorescence microscopy, temperature-dependent internalization assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic reconstitution with substrate kinetics and inhibitor validation","pmids":["10521426"],"is_preprint":false},{"year":1999,"finding":"A 1.2-kb fragment of the 5' flanking region of human granzyme H directs expression specifically to LAK cells and T/NK cell progenitors in transgenic mice, but not to resting T or NK cells, CTL, or other tissues, demonstrating that this region contains sufficient cis-acting sequences for NK/LAK-specific transcriptional targeting.","method":"Transgenic mouse reporter assay (SV40 large T-antigen), flow cytometry, Western blot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — in vivo transgenic reporter with tissue-specific functional validation","pmids":["9920846"],"is_preprint":false},{"year":2004,"finding":"Granzyme H protein is constitutively expressed at high levels in CD3−CD56+ NK cells (detected by novel monoclonal antibody against recombinant GzmH), where it is more abundant than granzyme B. In contrast, CD4+ and CD8+ T cells express far lower levels, and classical T cell activation stimuli that induce granzyme B do not induce granzyme H in T cells. Granzyme H is absent in NK T cells, monocytes, and neutrophils. mRNA and protein levels correlate well in cells expressing both granzymes B and H.","method":"Monoclonal antibody generation, flow cytometry, Western blot, immunohistochemistry, Northern blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — novel antibody with multiple orthogonal methods across diverse cell types","pmids":["15069086"],"is_preprint":false},{"year":2007,"finding":"Granzyme H induces target cell death independently of caspase activation, Bid cleavage, ICAD cleavage, or cytochrome c release, but involves mitochondrial depolarization and reactive oxygen species generation after perforin or streptolysin O-mediated delivery into cells. This defines an alternative, caspase-independent programmed cell death pathway distinct from granzyme B.","method":"Perforin/streptolysin O delivery, flow cytometry (mitochondrial membrane potential, ROS, PS externalization), immunoblot (caspase activation, Bid, ICAD, cytochrome c)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal assays in a single study clearly defining mechanism","pmids":["17409270"],"is_preprint":false},{"year":2007,"finding":"Granzyme H directly cleaves the adenovirus DNA-binding protein (DBP) at a specific site, causing significant decay of viral DNA replication. GzmH also cleaves the adenovirus 100K assembly protein, a major inhibitor of granzyme B, thereby relieving granzyme B inhibition. A granzyme H-resistant DBP mutant virus confirmed that DBP cleavage is the direct cause of viral DNA replication inhibition.","method":"In vitro cleavage assays, virus encoding GzmH-resistant DBP (site-directed mutagenesis), viral DNA replication assay, immunoblot","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro cleavage confirmed by mutagenesis-resistant virus; multiple orthogonal methods","pmids":["17363894"],"is_preprint":false},{"year":2007,"finding":"Granzyme H induces target cell apoptosis with phosphatidylserine externalization, nuclear condensation, DNA fragmentation, caspase activation, and cytochrome c release. GzmH directly cleaves ICAD (inhibitor of caspase-activated DNase) to activate CAD nuclease for DNA fragmentation, and directly processes Bid to generate tBid leading to cytochrome c release.","method":"In vitro cleavage assay with recombinant proteins, immunoblot for caspase activation/Bid/cytochrome c, flow cytometry","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 1-2 — direct cleavage assays; contradicts some findings of PMID:17409270 regarding caspase/Bid involvement, suggesting cell-context dependence","pmids":["17765974"],"is_preprint":false},{"year":2008,"finding":"Granzyme H cleaves the La autoantigen at Phe-364 (P1 site), generating a C-terminally truncated La fragment that loses nuclear localization and reduces HCV-IRES-mediated translational activity. This identifies La as the first nonapoptotic substrate of GzmH and reveals a mechanism by which GzmH can suppress HCV replication independently of cell death.","method":"In vitro cleavage assay, N-terminal sequencing to identify cleavage site, immunofluorescence (nuclear localization), HCV-IRES luciferase reporter assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with precise cleavage site identification and functional validation of translational activity","pmids":["19039329"],"is_preprint":false},{"year":2011,"finding":"Crystal structures of D102N-GzmH mutant alone (2.2 Å), in complex with a decapeptide substrate (2.4 Å), and with an inhibitor (2.7 Å) revealed that Thr189, Gly216, and Gly226 in the S1 pocket define preference for bulky aromatic residues (Tyr and Phe) at the P1 position. A unique RKR motif (Arg39-Lys40-Arg41) conserved only in GzmH defines S3'/S4' binding regions with preference for acidic residues at P3'/P4'. Disruption of the RKR motif or P3'/P4' acidic residues abolished proteolytic activity. A selective tetrapeptide inhibitor Ac-PTSY-chloromethylketone was designed and validated.","method":"X-ray crystallography, site-directed mutagenesis, enzymatic activity assay, inhibitor design and validation","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — crystal structures at high resolution combined with mutagenesis and functional validation","pmids":["22156497"],"is_preprint":false},{"year":2011,"finding":"Granzyme H cleaves hepatitis B virus X protein (HBx) at Met79, leading to HBx degradation. GzmH-mediated HBx cleavage inhibits HBV replication without inducing cell lysis. A GzmH inhibitor abolished LAK cell-mediated HBx degradation and HBV clearance; HBx-deficient HBV was resistant to GzmH-mediated clearance. Adoptive transfer of GzmH-overexpressing NK cells into HBV carrier mice facilitated in vivo HBV eradication.","method":"In vitro cleavage assay, site identification by sequencing, HBV replication assay, inhibitor blockade, HBx-deficient virus experiment, adoptive NK cell transfer in vivo","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro cleavage confirmed with multiple orthogonal validations including in vivo adoptive transfer","pmids":["22156339"],"is_preprint":false},{"year":2012,"finding":"SERPINB1 was identified as a potent physiological intracellular inhibitor of granzyme H. Upon cleavage of the SERPINB1 reactive center loop at Phe343, SERPINB1 forms an SDS-stable covalent complex with GzmH (suicide inhibition mechanism). SERPINB1 overexpression suppresses GzmH- and LAK cell-mediated cytotoxicity. Crystal structures of active GzmH (3.0 Å) and SERPINB1 LM-DD mutant (2.9 Å) were solved; molecular modeling revealed conformational changes in GzmH required for suicide inhibition.","method":"Crystal structure determination, SDS-PAGE covalent complex detection, overexpression cytotoxicity assay, molecular modeling","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — crystal structures combined with biochemical and functional validation of inhibitory mechanism","pmids":["23269243"],"is_preprint":false},{"year":2013,"finding":"Granzyme H induces cell death via a Bcl-2-sensitive mitochondrial pathway without direct Bid processing; neither the apoptosome nor caspase-3 is essential. GzmH does directly process DFF45 (also known as ICAD), potentially contributing to DNA damage. This pathway is distinct from both granzyme B and FasL pathways.","method":"Purified recombinant GzmH delivery, Bcl-2 overexpression rescue, caspase inhibitor studies, immunoblot for Bid/DFF45/caspase-3","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 — recombinant protein with multiple pathway dissection experiments; single study","pmids":["23352961"],"is_preprint":false},{"year":2014,"finding":"Human mast cells (cord blood-derived and LAD2 cell line) express granzyme H at the mRNA and protein levels. Upon mast cell activation by calcium ionophore or IgE receptor cross-linking, granzyme H expression is down-regulated while granzyme B expression is up-regulated, demonstrating reciprocal regulation of the two granzymes in mast cells.","method":"Quantitative PCR, Western blot, confocal immunofluorescence, flow cytometry, mast cell activation assays","journal":"International archives of allergy and immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods for expression characterization with functional activation stimulus","pmids":["25342632"],"is_preprint":false},{"year":2023,"finding":"GZMH is highly expressed in NK cells in atherosclerotic cerebral small vessel disease (aCSVD) lesions. In a blood-brain barrier model, GZMH disrupted demyelinated nerve fibers, and this disruption was reversed by the GzmH inhibitor 3,4-DCIC, both in vitro and in vivo during white matter hyperintensity. ITGB2 (integrin β2) from NK cells interacted with ICAM-1 on vascular endothelial cells.","method":"Proteomics (CSF/plasma/NK cells), immunofluorescence, scanning electron microscopy, blood-brain barrier transwell model, inhibitor rescue experiment in vitro and in vivo","journal":"The journals of gerontology. Series A","confidence":"Medium","confidence_rationale":"Tier 2 — inhibitor rescue experiments in vitro and in vivo support causal role; single study","pmids":["36006802"],"is_preprint":false}],"current_model":"GZMH (granzyme H) is a chymotrypsin-like serine protease constitutively expressed in NK cells (and at lower levels in cytotoxic T cells and mast cells) that kills target cells via a caspase-independent, Bcl-2-sensitive mitochondrial pathway distinct from granzyme B; it directly cleaves viral substrates including adenovirus DBP and 100K assembly protein (disrupting viral replication and relieving granzyme B inhibition), HBV HBx protein (enabling non-cytolytic viral clearance), and the host La autoantigen (suppressing HCV-IRES translation), with substrate specificity for bulky aromatic P1 residues (Tyr/Phe) defined by a Thr189/Gly216/Gly226 S1 triad and a unique RKR motif controlling S3'/S4' preference, while its activity is regulated by the physiological inhibitor SERPINB1 via covalent suicide inhibition at Phe343."},"narrative":{"teleology":[{"year":1990,"claim":"Establishing granzyme H as a distinct serine protease in the cytotoxic lymphocyte repertoire required molecular cloning, which revealed a 246-amino-acid prepropeptide with a catalytic triad, clustered with granzyme B and cathepsin G on chromosome 14q11.2.","evidence":"cDNA library screening, gene sequencing, chromosomal mapping, and phylogenetic analysis across multiple studies","pmids":["3090449","3182016","2402757","2300587","2049336","2007574"],"confidence":"Medium","gaps":["No enzymatic activity demonstrated at this stage","Relationship to mouse granzymes C–G unclear","Functional role entirely inferred from sequence homology"]},{"year":1999,"claim":"Reconstitution of recombinant granzyme H enzymatic activity resolved whether the protein was catalytically active and defined its chymase-type substrate specificity (P1 preference for Phe, Tyr, Met), while demonstrating temperature-dependent internalization into target cell endosomes.","evidence":"Baculovirus-expressed recombinant GzmH, synthetic substrate kinetics, serine protease inhibitor profiling, fluorescence microscopy internalization assay","pmids":["10521426"],"confidence":"High","gaps":["No physiological substrates identified","Mechanism of cell death not addressed","Receptor for internalization unknown"]},{"year":2004,"claim":"Protein-level profiling with a novel monoclonal antibody established that granzyme H is constitutively abundant in NK cells—exceeding granzyme B—and is not induced by classical T cell activation stimuli, distinguishing its regulation from granzyme B.","evidence":"Monoclonal antibody generation against recombinant GzmH, flow cytometry, Western blot, and immunohistochemistry across diverse immune cell populations","pmids":["15069086"],"confidence":"High","gaps":["Transcription factors driving NK-specific constitutive expression not identified","Functional consequence of high NK expression undefined"]},{"year":2007,"claim":"Delivery of granzyme H into target cells via perforin or streptolysin O revealed a caspase-independent cell death pathway involving mitochondrial depolarization and ROS without Bid cleavage or cytochrome c release, establishing a killing mechanism distinct from granzyme B.","evidence":"Perforin/streptolysin O delivery system, flow cytometry for mitochondrial potential and ROS, immunoblot for caspase substrates","pmids":["17409270"],"confidence":"High","gaps":["Direct mitochondrial target not identified","Conflicting report (PMID:17765974) found caspase activation and Bid cleavage, suggesting cell-context dependence","In vivo cytotoxicity not demonstrated"]},{"year":2007,"claim":"Identification of adenovirus DBP and 100K protein as direct granzyme H substrates established a dual antiviral mechanism: direct inhibition of viral DNA replication via DBP cleavage and relief of granzyme B evasion via 100K cleavage, confirmed by a GzmH-resistant DBP mutant virus.","evidence":"In vitro cleavage assays, site-directed mutagenesis generating resistant virus, viral DNA replication quantification","pmids":["17363894"],"confidence":"High","gaps":["In vivo antiadenoviral role of GzmH not tested","Whether other viral proteins are substrates unknown"]},{"year":2008,"claim":"Cleavage of the host La autoantigen at Phe-364 by granzyme H identified the first non-cytolytic antiviral substrate, as truncated La lost nuclear localization and HCV-IRES translational activity, revealing a mechanism to suppress HCV replication without killing the host cell.","evidence":"In vitro cleavage with N-terminal sequencing of products, immunofluorescence for La localization, HCV-IRES luciferase reporter assay","pmids":["19039329"],"confidence":"High","gaps":["Effect on HCV replication in infected cells not shown","Whether La cleavage occurs in vivo during HCV infection unknown"]},{"year":2011,"claim":"Crystal structures of granzyme H with substrate and inhibitor defined the structural basis of specificity: Thr189/Gly216/Gly226 shape the S1 pocket for aromatic P1 residues, and a unique RKR motif (Arg39-Lys40-Arg41) creates S3'/S4' subsites preferring acidic residues, enabling design of a selective tetrapeptide inhibitor.","evidence":"X-ray crystallography (2.2–2.7 Å), site-directed mutagenesis of RKR motif and substrates, Ac-PTSY-CMK inhibitor validation","pmids":["22156497"],"confidence":"High","gaps":["Full-length natural substrate structures in complex not determined","Dynamics of the RKR loop during catalysis unexplored"]},{"year":2011,"claim":"Direct cleavage of hepatitis B virus HBx protein at Met79 by granzyme H provided evidence for non-cytolytic HBV clearance, validated in vivo by adoptive transfer of GzmH-overexpressing NK cells into HBV carrier mice.","evidence":"In vitro cleavage assay, HBV replication assay, GzmH inhibitor blockade, HBx-deficient virus control, adoptive NK cell transfer in vivo","pmids":["22156339"],"confidence":"High","gaps":["Physiological relevance in human HBV infection not confirmed","Contribution of GzmH relative to other granzymes in vivo unclear"]},{"year":2012,"claim":"Identification of SERPINB1 as a covalent suicide inhibitor of granzyme H—forming an SDS-stable complex upon cleavage at Phe343—established the first physiological regulatory mechanism, confirmed by SERPINB1 overexpression suppressing GzmH- and LAK-mediated killing.","evidence":"Crystal structures of active GzmH and SERPINB1 mutant, SDS-PAGE covalent complex detection, cytotoxicity assays with SERPINB1 overexpression","pmids":["23269243"],"confidence":"High","gaps":["Subcellular compartment of SERPINB1–GzmH interaction not defined","Whether other serpins regulate GzmH unknown","Stoichiometry in vivo not established"]},{"year":2013,"claim":"Further dissection confirmed that granzyme H cytotoxicity proceeds through a Bcl-2-sensitive mitochondrial pathway without requiring the apoptosome or caspase-3, while demonstrating direct DFF45/ICAD processing as a potential contributor to DNA fragmentation.","evidence":"Recombinant GzmH delivery, Bcl-2 overexpression rescue, caspase inhibitors, immunoblot for Bid/DFF45/caspase-3","pmids":["23352961"],"confidence":"Medium","gaps":["Direct mitochondrial target(s) remain unidentified","Discrepancy with PMID:17765974 regarding Bid processing not fully resolved"]},{"year":2023,"claim":"A pathological role for granzyme H was identified in atherosclerotic cerebral small vessel disease, where NK cell-derived GzmH disrupts demyelinated nerve fibers in a process reversible by the GzmH inhibitor 3,4-DCIC, linking granzyme H to neuroinflammatory tissue damage.","evidence":"Proteomics of CSF/plasma/NK cells, blood-brain barrier transwell model, scanning electron microscopy, inhibitor rescue in vitro and in vivo","pmids":["36006802"],"confidence":"Medium","gaps":["Direct substrate in neural tissue not identified","Single study requiring independent replication","Mechanism of nerve fiber disruption (direct cleavage vs. indirect) not resolved"]},{"year":null,"claim":"Key unresolved questions include the identity of the direct mitochondrial target(s) mediating caspase-independent cell death, the receptor(s) mediating granzyme H internalization, and the in vivo contribution of granzyme H relative to other granzymes in antiviral immunity and immunopathology.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Mitochondrial target unknown","Internalization receptor unidentified","Relative contribution to in vivo immunity vs. granzyme B not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[6,10,11,12,13,14,15,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[6,13]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[6,8]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[10,14]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,9,10,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,11,16]}],"complexes":[],"partners":["SERPINB1","DBP","HBX","SSB"],"other_free_text":[]},"mechanistic_narrative":"Granzyme H is a chymotrypsin-like serine protease constitutively expressed at high levels in CD56+ NK cells that kills target cells through a caspase-independent, Bcl-2-sensitive mitochondrial pathway involving mitochondrial depolarization and reactive oxygen species generation, mechanistically distinct from granzyme B [PMID:17409270, PMID:23352961]. Its substrate specificity for bulky aromatic P1 residues (Tyr/Phe) is determined by a Thr189/Gly216/Gly226 S1 pocket and a unique RKR motif governing S3'/S4' preference for acidic residues [PMID:22156497]. Beyond cytotoxicity, granzyme H directly cleaves viral substrates—adenovirus DBP and 100K assembly protein, hepatitis B virus HBx, and the host La autoantigen—to suppress viral replication through both cytolytic and non-cytolytic mechanisms [PMID:17363894, PMID:22156339, PMID:19039329]. Its proteolytic activity is regulated by the intracellular serpin SERPINB1, which forms a covalent suicide-inhibitory complex upon cleavage at Phe343 [PMID:23269243]."},"prefetch_data":{"uniprot":{"accession":"P20718","full_name":"Granzyme H","aliases":["CCP-X","Cathepsin G-like 2","CTSGL2","Cytotoxic T-lymphocyte proteinase","Cytotoxic serine protease C","CSP-C"],"length_aa":246,"mass_kda":27.3,"function":"Cytotoxic chymotrypsin-like serine protease with preference for bulky and aromatic residues at the P1 position and acidic residues at the P3' and P4' sites. Probably necessary for target cell lysis in cell-mediated immune responses. Participates in the antiviral response via direct cleavage of several proteins essential for viral replication","subcellular_location":"Cytolytic granule","url":"https://www.uniprot.org/uniprotkb/P20718/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GZMH","classification":"Not Classified","n_dependent_lines":133,"n_total_lines":1208,"dependency_fraction":0.11009933774834436},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GZMH","total_profiled":1310},"omim":[{"mim_id":"116831","title":"GRANZYME H; GZMH","url":"https://www.omim.org/entry/116831"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":31.9},{"tissue":"lymphoid tissue","ntpm":23.6}],"url":"https://www.proteinatlas.org/search/GZMH"},"hgnc":{"alias_symbol":["CGL-2","CCP-X","CTLA1","CSP-C"],"prev_symbol":["CTSGL2"]},"alphafold":{"accession":"P20718","domains":[{"cath_id":"2.40.10.10","chopping":"34-127_237-246","consensus_level":"medium","plddt":97.5638,"start":34,"end":246},{"cath_id":"2.40.10.10","chopping":"141-234","consensus_level":"medium","plddt":96.2396,"start":141,"end":234}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P20718","model_url":"https://alphafold.ebi.ac.uk/files/AF-P20718-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P20718-F1-predicted_aligned_error_v6.png","plddt_mean":92.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GZMH","jax_strain_url":"https://www.jax.org/strain/search?query=GZMH"},"sequence":{"accession":"P20718","fasta_url":"https://rest.uniprot.org/uniprotkb/P20718.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P20718/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P20718"}},"corpus_meta":[{"pmid":"3090449","id":"PMC_3090449","title":"The 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the CTLA-1 serine esterase and Tcr alpha loci in mouse and man.","date":"1988","source":"Immunogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/3182016","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16489010","id":"PMC_16489010","title":"Induction of centrosome amplification during arsenite-induced mitotic arrest in CGL-2 cells.","date":"2006","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/16489010","citation_count":44,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35344575","id":"PMC_35344575","title":"A novel CSP C-terminal epitope targeted by an antibody with protective activity against Plasmodium falciparum.","date":"2022","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/35344575","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"2402757","id":"PMC_2402757","title":"Characterization of a novel, human cytotoxic lymphocyte-specific serine protease cDNA clone 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Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17363894","id":"PMC_17363894","title":"Granzyme H destroys the function of critical adenoviral proteins required for viral DNA replication and granzyme B inhibition.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17363894","citation_count":89,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12515723","id":"PMC_12515723","title":"Cell death induced by granzyme 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human lymphocytes.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15069086","citation_count":69,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35256949","id":"PMC_35256949","title":"Histone deacetylase inhibitors inhibit cervical cancer growth through Parkin acetylation-mediated mitophagy.","date":"2021","source":"Acta pharmaceutica Sinica. 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Series A, Biological sciences and medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36006802","citation_count":10,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23352961","id":"PMC_23352961","title":"Granzyme H induces cell death primarily via a Bcl-2-sensitive mitochondrial cell death pathway that does not require direct Bid activation.","date":"2013","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/23352961","citation_count":8,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25342632","id":"PMC_25342632","title":"Granzyme H is a novel protease expressed by human mast cells.","date":"2014","source":"International archives of allergy and immunology","url":"https://pubmed.ncbi.nlm.nih.gov/25342632","citation_count":8,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19024195","id":"PMC_19024195","title":"To study the significance of apoptotic enzyme granzyme H in breast cancer patients.","date":"2008","source":"Journal of Ayub Medical College, Abbottabad : JAMC","url":"https://pubmed.ncbi.nlm.nih.gov/19024195","citation_count":4,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25250148","id":"PMC_25250148","title":"Granzyme h serum levels variations with both reproductive hormone receptors, and related hormone receptors in breast cancer patients.","date":"2014","source":"Iranian journal of cancer prevention","url":"https://pubmed.ncbi.nlm.nih.gov/25250148","citation_count":4,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8159,"output_tokens":1270,"usd":0.021764},"stage2":{"model":"claude-opus-4-6","input_tokens":4496,"output_tokens":1259,"usd":0.080933},"total_usd":0.345273,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":20627,"output_tokens":5098,"usd":0.069176},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":8550,"output_tokens":2914,"usd":0.1734}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"CTLA-1 (mouse ortholog of GZMH) encodes a serine esterase preferentially expressed in cytotoxic T lymphocytes, with protein sequence homology to serine esterases, and is co-induced with cytotoxic activity in thymocytes and hybridoma cells. The gene was localized to mouse chromosome 14.\",\n      \"method\": \"Differential cDNA library screening, sequence analysis, protein homology comparison, co-induction experiments in thymocytes and hybridoma cells, in situ hybridization for chromosomal localization\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational paper with multiple orthogonal methods; highly cited (208 citations), replicated by subsequent work\",\n      \"pmids\": [\"3090449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"CTLA-1 (mouse ortholog of GZMH) serine esterase transcripts are expressed in cytolytic T cells and mast cells, but are absent in activated cytotoxic macrophages and most natural cytotoxic cells, indicating this serine esterase is not required for macrophage or natural cytotoxicity and is not a universal marker of cytotoxic T cells.\",\n      \"method\": \"Northern blot / transcript detection across diverse lymphoid and non-lymphoid cell types\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, expression-based functional inference across many cell types\",\n      \"pmids\": [\"3495579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"The CTLA-1 serine esterase gene (mouse ortholog of GZMH) is closely linked to the T-cell receptor alpha (TCR-α) locus on mouse chromosome 14D and on human chromosome 14q11-q12, demonstrating physical proximity of a serine protease gene with an immunoglobulin superfamily gene.\",\n      \"method\": \"In situ hybridization, restriction fragment length polymorphism linkage analysis, pulsed-field gel electrophoresis\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal mapping methods in single study; genomic localization with functional context\",\n      \"pmids\": [\"3182016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Human CSP-C (subsequently identified as GZMH/CGL-2) is a novel cytotoxic lymphocyte-specific serine protease with a catalytic charge relay system, expressed as a prepropeptide, showing 71% amino acid identity with CSP-B/granzyme B, 57% with cathepsin G, and 41% with granzyme A; expressed in IL-2- or IL-2+PHA-stimulated lymphocytes but not in B-lymphoblastoid or T-leukemia cell lines.\",\n      \"method\": \"cDNA cloning and sequencing, open reading frame analysis, amino acid sequence comparison, Northern blot analysis of tissue specificity\",\n      \"journal\": \"Tissue antigens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct sequence and structural characterization; single lab but multiple methods\",\n      \"pmids\": [\"2402757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GZMH+ CD8+ T cells expanded intrathecally in multiple sclerosis patients recognize EBV epitopes, are activated and expanded by EBV-infected CSF B cells, and kill autologous EBV-infected CSF B cell lines in vitro, indicating GZMH+ cytotoxic T cells have a functional role in targeting EBV-infected B cells in the CNS.\",\n      \"method\": \"TCR/BCR repertoire analysis combined with transcriptional profiling, flow cytometry, and in vitro cytotoxicity killing assays\",\n      \"journal\": \"medRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro functional killing assay with mechanistic characterization; single lab, preprint\",\n      \"pmids\": [\"40970118\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"GZMH (human CGL-2/CSP-C) is a cytotoxic lymphocyte-specific serine protease expressed as a prepropeptide in IL-2-stimulated T cells and NK cells, closely related to granzyme B and cathepsin G, that localizes to chromosome 14q11 near the TCR-α locus; its GZMH+ CD8+ T cells can recognize viral (EBV) antigens and kill target cells via cytotoxic mechanisms, consistent with a role in cytotoxic lymphocyte-mediated immunity.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries from KEPT papers.\n\n**Classification:**\n- Papers [1]-[5] from retrieved: KEEP (1,2,4 about CTLA-1/serine esterase in CTLs = GZMH precursor/ortholog context), EXCLUDE (3,5 = arsenite/CGL-2 cell line unrelated to GZMH protein), EXCLUDE (6,8 = CSP/malaria papers - alias collision), KEEP (7 = CSP-C = GZMH), EXCLUDE (9 = miR-1972/GZMH but purely expression/phenotype without mechanism), KEEP (10 = GZMH+CD8 T cells - but expression/correlation only), EXCLUDE (11,12,13 retrieved = expression studies only)\n\n- gene2pubmed papers: KEEP mechanistic ones: 5,6,7,8,9,11,12,13,14,15,16,18,19,22,23,24,25,26,27\n- EXCLUDE: 1,2,3,4,10,17,20,21,28,29 (genomics/expression/unrelated)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"CTLA-1 (mouse ortholog of GZMH-related serine esterase) was identified as a transcript specifically induced in cytotoxic T lymphocytes, with its protein sequence showing homology to serine esterases, and the gene was mapped to mouse chromosome 14.\",\n      \"method\": \"Differential cDNA library screening, sequence analysis, chromosomal in situ hybridization\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — foundational cloning and sequence characterization; single study but multiple orthogonal methods\",\n      \"pmids\": [\"3090449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"The human homolog of CTLA-1 (GZMH precursor) was mapped to chromosome 14q11-q12, in close proximity to the T-cell receptor alpha gene locus, with gene order established as centromere-NP-1-TCRα-CTLA-1.\",\n      \"method\": \"In situ hybridization, pulsed field gel electrophoresis, restriction fragment length polymorphism genetic linkage\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal mapping methods in a single study\",\n      \"pmids\": [\"3182016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"GZMH (as CSP-C/CGL-2) was identified as a novel human cytotoxic lymphocyte-specific serine protease with a 246-amino acid prepropeptide structure containing the catalytic charge relay system characteristic of serine proteases; it shares 71% amino acid identity with CSP-B/granzyme B and 57% with cathepsin G. The gene is located on chromosome 14q11 within a cluster including CSP-B and cathepsin G.\",\n      \"method\": \"cDNA library screening, sequence analysis, Northern blot expression analysis\",\n      \"journal\": \"Tissue antigens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular cloning with sequence and expression characterization\",\n      \"pmids\": [\"2402757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"CGL-2 (GZMH) and cathepsin G and CGL-1 genes are clustered within an approximately 50-kb locus on human chromosome 14q11.2, the same chromosomal band as the alpha and delta T-cell receptor genes; CGL-2 is expressed at lower levels than CGL-1 in activated peripheral blood lymphocytes, LAK and NK cells.\",\n      \"method\": \"Genomic library cloning, Southern blotting, chromosomal mapping, Northern blot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods for genomic and expression characterization\",\n      \"pmids\": [\"2300587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Granzyme H gene structure consists of 5 exons and 4 introns (same organization as granzyme B and cathepsin G), and evolutionary analysis revealed that interlocus recombination between ancestral granzyme B and granzyme H genes occurred approximately 21 million years ago, replacing exon 3, intron 3, and part of exon 4 in granzyme H with granzyme B sequences. Granzyme H is more closely related to cathepsin G and granzyme B than to murine granzymes C–G.\",\n      \"method\": \"Gene sequencing, phylogenetic tree reconstruction, comparative genomics\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — complete gene sequencing with evolutionary analysis\",\n      \"pmids\": [\"2049336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"CGL-2 (GZMH) has the same 5-exon/4-intron gene organization as cathepsin G and CGL-1, with identical intron splice phases; the 5' flanking regions of CGL-1 and CGL-2 are minimally related, suggesting distinct cis-regulatory elements drive their differential lineage-specific expression.\",\n      \"method\": \"Gene sequencing, structural comparison, Northern blot expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comparative gene structure analysis with expression profiling\",\n      \"pmids\": [\"2007574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Recombinant granzyme H has chymotrypsin-like (chymase) activity, efficiently cleaving Suc-Phe-Leu-Phe-SBzl and Boc-Ala-Ala-X-SBzl substrates with preference for Phe, Tyr, Met, Nle, or Nva at the P1 position; activity was inhibited by 3,4-dichloroisocoumarin and PMSF. Fluorescein-labeled granzyme H was internalized by Jurkat cells into endosome-like vesicles in a temperature-dependent manner, suggesting cell-surface receptor binding similar to granzyme B.\",\n      \"method\": \"Baculovirus recombinant protein expression, enzymatic substrate cleavage assays, fluorescence microscopy, temperature-dependent internalization assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic reconstitution with substrate kinetics and inhibitor validation\",\n      \"pmids\": [\"10521426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"A 1.2-kb fragment of the 5' flanking region of human granzyme H directs expression specifically to LAK cells and T/NK cell progenitors in transgenic mice, but not to resting T or NK cells, CTL, or other tissues, demonstrating that this region contains sufficient cis-acting sequences for NK/LAK-specific transcriptional targeting.\",\n      \"method\": \"Transgenic mouse reporter assay (SV40 large T-antigen), flow cytometry, Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic reporter with tissue-specific functional validation\",\n      \"pmids\": [\"9920846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Granzyme H protein is constitutively expressed at high levels in CD3−CD56+ NK cells (detected by novel monoclonal antibody against recombinant GzmH), where it is more abundant than granzyme B. In contrast, CD4+ and CD8+ T cells express far lower levels, and classical T cell activation stimuli that induce granzyme B do not induce granzyme H in T cells. Granzyme H is absent in NK T cells, monocytes, and neutrophils. mRNA and protein levels correlate well in cells expressing both granzymes B and H.\",\n      \"method\": \"Monoclonal antibody generation, flow cytometry, Western blot, immunohistochemistry, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel antibody with multiple orthogonal methods across diverse cell types\",\n      \"pmids\": [\"15069086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Granzyme H induces target cell death independently of caspase activation, Bid cleavage, ICAD cleavage, or cytochrome c release, but involves mitochondrial depolarization and reactive oxygen species generation after perforin or streptolysin O-mediated delivery into cells. This defines an alternative, caspase-independent programmed cell death pathway distinct from granzyme B.\",\n      \"method\": \"Perforin/streptolysin O delivery, flow cytometry (mitochondrial membrane potential, ROS, PS externalization), immunoblot (caspase activation, Bid, ICAD, cytochrome c)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal assays in a single study clearly defining mechanism\",\n      \"pmids\": [\"17409270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Granzyme H directly cleaves the adenovirus DNA-binding protein (DBP) at a specific site, causing significant decay of viral DNA replication. GzmH also cleaves the adenovirus 100K assembly protein, a major inhibitor of granzyme B, thereby relieving granzyme B inhibition. A granzyme H-resistant DBP mutant virus confirmed that DBP cleavage is the direct cause of viral DNA replication inhibition.\",\n      \"method\": \"In vitro cleavage assays, virus encoding GzmH-resistant DBP (site-directed mutagenesis), viral DNA replication assay, immunoblot\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro cleavage confirmed by mutagenesis-resistant virus; multiple orthogonal methods\",\n      \"pmids\": [\"17363894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Granzyme H induces target cell apoptosis with phosphatidylserine externalization, nuclear condensation, DNA fragmentation, caspase activation, and cytochrome c release. GzmH directly cleaves ICAD (inhibitor of caspase-activated DNase) to activate CAD nuclease for DNA fragmentation, and directly processes Bid to generate tBid leading to cytochrome c release.\",\n      \"method\": \"In vitro cleavage assay with recombinant proteins, immunoblot for caspase activation/Bid/cytochrome c, flow cytometry\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — direct cleavage assays; contradicts some findings of PMID:17409270 regarding caspase/Bid involvement, suggesting cell-context dependence\",\n      \"pmids\": [\"17765974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Granzyme H cleaves the La autoantigen at Phe-364 (P1 site), generating a C-terminally truncated La fragment that loses nuclear localization and reduces HCV-IRES-mediated translational activity. This identifies La as the first nonapoptotic substrate of GzmH and reveals a mechanism by which GzmH can suppress HCV replication independently of cell death.\",\n      \"method\": \"In vitro cleavage assay, N-terminal sequencing to identify cleavage site, immunofluorescence (nuclear localization), HCV-IRES luciferase reporter assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with precise cleavage site identification and functional validation of translational activity\",\n      \"pmids\": [\"19039329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structures of D102N-GzmH mutant alone (2.2 Å), in complex with a decapeptide substrate (2.4 Å), and with an inhibitor (2.7 Å) revealed that Thr189, Gly216, and Gly226 in the S1 pocket define preference for bulky aromatic residues (Tyr and Phe) at the P1 position. A unique RKR motif (Arg39-Lys40-Arg41) conserved only in GzmH defines S3'/S4' binding regions with preference for acidic residues at P3'/P4'. Disruption of the RKR motif or P3'/P4' acidic residues abolished proteolytic activity. A selective tetrapeptide inhibitor Ac-PTSY-chloromethylketone was designed and validated.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, enzymatic activity assay, inhibitor design and validation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures at high resolution combined with mutagenesis and functional validation\",\n      \"pmids\": [\"22156497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Granzyme H cleaves hepatitis B virus X protein (HBx) at Met79, leading to HBx degradation. GzmH-mediated HBx cleavage inhibits HBV replication without inducing cell lysis. A GzmH inhibitor abolished LAK cell-mediated HBx degradation and HBV clearance; HBx-deficient HBV was resistant to GzmH-mediated clearance. Adoptive transfer of GzmH-overexpressing NK cells into HBV carrier mice facilitated in vivo HBV eradication.\",\n      \"method\": \"In vitro cleavage assay, site identification by sequencing, HBV replication assay, inhibitor blockade, HBx-deficient virus experiment, adoptive NK cell transfer in vivo\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro cleavage confirmed with multiple orthogonal validations including in vivo adoptive transfer\",\n      \"pmids\": [\"22156339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SERPINB1 was identified as a potent physiological intracellular inhibitor of granzyme H. Upon cleavage of the SERPINB1 reactive center loop at Phe343, SERPINB1 forms an SDS-stable covalent complex with GzmH (suicide inhibition mechanism). SERPINB1 overexpression suppresses GzmH- and LAK cell-mediated cytotoxicity. Crystal structures of active GzmH (3.0 Å) and SERPINB1 LM-DD mutant (2.9 Å) were solved; molecular modeling revealed conformational changes in GzmH required for suicide inhibition.\",\n      \"method\": \"Crystal structure determination, SDS-PAGE covalent complex detection, overexpression cytotoxicity assay, molecular modeling\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures combined with biochemical and functional validation of inhibitory mechanism\",\n      \"pmids\": [\"23269243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Granzyme H induces cell death via a Bcl-2-sensitive mitochondrial pathway without direct Bid processing; neither the apoptosome nor caspase-3 is essential. GzmH does directly process DFF45 (also known as ICAD), potentially contributing to DNA damage. This pathway is distinct from both granzyme B and FasL pathways.\",\n      \"method\": \"Purified recombinant GzmH delivery, Bcl-2 overexpression rescue, caspase inhibitor studies, immunoblot for Bid/DFF45/caspase-3\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — recombinant protein with multiple pathway dissection experiments; single study\",\n      \"pmids\": [\"23352961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human mast cells (cord blood-derived and LAD2 cell line) express granzyme H at the mRNA and protein levels. Upon mast cell activation by calcium ionophore or IgE receptor cross-linking, granzyme H expression is down-regulated while granzyme B expression is up-regulated, demonstrating reciprocal regulation of the two granzymes in mast cells.\",\n      \"method\": \"Quantitative PCR, Western blot, confocal immunofluorescence, flow cytometry, mast cell activation assays\",\n      \"journal\": \"International archives of allergy and immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods for expression characterization with functional activation stimulus\",\n      \"pmids\": [\"25342632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GZMH is highly expressed in NK cells in atherosclerotic cerebral small vessel disease (aCSVD) lesions. In a blood-brain barrier model, GZMH disrupted demyelinated nerve fibers, and this disruption was reversed by the GzmH inhibitor 3,4-DCIC, both in vitro and in vivo during white matter hyperintensity. ITGB2 (integrin β2) from NK cells interacted with ICAM-1 on vascular endothelial cells.\",\n      \"method\": \"Proteomics (CSF/plasma/NK cells), immunofluorescence, scanning electron microscopy, blood-brain barrier transwell model, inhibitor rescue experiment in vitro and in vivo\",\n      \"journal\": \"The journals of gerontology. Series A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — inhibitor rescue experiments in vitro and in vivo support causal role; single study\",\n      \"pmids\": [\"36006802\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GZMH (granzyme H) is a chymotrypsin-like serine protease constitutively expressed in NK cells (and at lower levels in cytotoxic T cells and mast cells) that kills target cells via a caspase-independent, Bcl-2-sensitive mitochondrial pathway distinct from granzyme B; it directly cleaves viral substrates including adenovirus DBP and 100K assembly protein (disrupting viral replication and relieving granzyme B inhibition), HBV HBx protein (enabling non-cytolytic viral clearance), and the host La autoantigen (suppressing HCV-IRES translation), with substrate specificity for bulky aromatic P1 residues (Tyr/Phe) defined by a Thr189/Gly216/Gly226 S1 triad and a unique RKR motif controlling S3'/S4' preference, while its activity is regulated by the physiological inhibitor SERPINB1 via covalent suicide inhibition at Phe343.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GZMH (also known as CSP-C/CGL-2) is a serine protease expressed specifically in cytotoxic T lymphocytes and NK cells, containing a catalytic charge relay system characteristic of serine proteases and synthesized as a prepropeptide in IL-2-stimulated lymphocytes [PMID:2402757, PMID:3090449]. The gene is located on chromosome 14q11-q12 in close physical proximity to the TCR-α locus, and its mouse ortholog CTLA-1 maps to a syntenic region on mouse chromosome 14 [PMID:3182016]. GZMH shares 71% amino acid identity with granzyme B and 57% with cathepsin G, placing it within the granzyme family of cytotoxic lymphocyte serine proteases implicated in target cell killing [PMID:2402757].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Identification of CTLA-1 (mouse ortholog of GZMH) as a serine esterase co-induced with cytotoxic activity in T lymphocytes established that a dedicated serine protease gene is linked to the acquisition of cytolytic function.\",\n      \"evidence\": \"Differential cDNA library screening, sequence homology, co-induction experiments in thymocytes and hybridoma cells\",\n      \"pmids\": [\"3090449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No direct substrate identified for CTLA-1/GZMH enzymatic activity\",\n        \"Mechanism of cytotoxicity mediation not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 1987,\n      \"claim\": \"Expression profiling across immune cell types showed CTLA-1 is present in cytolytic T cells and mast cells but absent from activated macrophages, establishing that this protease is not a universal cytotoxic effector but rather lineage-restricted.\",\n      \"evidence\": \"Northern blot analysis across diverse lymphoid and non-lymphoid cell types\",\n      \"pmids\": [\"3495579\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Expression analysis limited to transcript level without protein confirmation\",\n        \"Functional significance of mast cell expression unexplored\"\n      ]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Chromosomal mapping revealed that GZMH/CTLA-1 resides near the TCR-α locus on chromosome 14q11 in both human and mouse, establishing a conserved genomic arrangement linking a serine protease gene with an immunoglobulin superfamily locus.\",\n      \"evidence\": \"In situ hybridization, RFLP linkage analysis, and pulsed-field gel electrophoresis\",\n      \"pmids\": [\"3182016\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional significance of genomic linkage to TCR-α not addressed\",\n        \"No evidence for coordinated transcriptional regulation with TCR-α\"\n      ]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Cloning and sequencing of human CSP-C/GZMH revealed a complete catalytic triad and high sequence identity with granzyme B (71%) and cathepsin G (57%), placing GZMH definitively within the granzyme serine protease family and identifying it as a prepropeptide requiring activation.\",\n      \"evidence\": \"cDNA cloning, open reading frame analysis, amino acid sequence comparison, Northern blot of stimulated lymphocytes\",\n      \"pmids\": [\"2402757\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No enzymatic activity assay performed with purified protein\",\n        \"Activation cleavage site and processing mechanism not characterized\",\n        \"Substrate specificity undetermined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct substrates, cleavage specificity, and precise mechanism by which GZMH contributes to target cell death remain uncharacterized; no loss-of-function or reconstitution experiments have been reported.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No substrate identified for GZMH protease activity\",\n        \"No knockout or knockdown studies reported\",\n        \"No structural model of GZMH available\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0140096\",\n        \"supporting_discovery_ids\": [0, 3]\n      }\n    ],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0005694\",\n        \"supporting_discovery_ids\": [2]\n      }\n    ],\n    \"pathway\": [\n      {\n        \"term_id\": \"R-HSA-168256\",\n        \"supporting_discovery_ids\": [0, 1, 3]\n      }\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Granzyme H is a chymotrypsin-like serine protease constitutively expressed at high levels in CD56+ NK cells that kills target cells through a caspase-independent, Bcl-2-sensitive mitochondrial pathway involving mitochondrial depolarization and reactive oxygen species generation, mechanistically distinct from granzyme B [PMID:17409270, PMID:23352961]. Its substrate specificity for bulky aromatic P1 residues (Tyr/Phe) is determined by a Thr189/Gly216/Gly226 S1 pocket and a unique RKR motif governing S3'/S4' preference for acidic residues [PMID:22156497]. Beyond cytotoxicity, granzyme H directly cleaves viral substrates—adenovirus DBP and 100K assembly protein, hepatitis B virus HBx, and the host La autoantigen—to suppress viral replication through both cytolytic and non-cytolytic mechanisms [PMID:17363894, PMID:22156339, PMID:19039329]. Its proteolytic activity is regulated by the intracellular serpin SERPINB1, which forms a covalent suicide-inhibitory complex upon cleavage at Phe343 [PMID:23269243].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing granzyme H as a distinct serine protease in the cytotoxic lymphocyte repertoire required molecular cloning, which revealed a 246-amino-acid prepropeptide with a catalytic triad, clustered with granzyme B and cathepsin G on chromosome 14q11.2.\",\n      \"evidence\": \"cDNA library screening, gene sequencing, chromosomal mapping, and phylogenetic analysis across multiple studies\",\n      \"pmids\": [\"3090449\", \"3182016\", \"2402757\", \"2300587\", \"2049336\", \"2007574\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic activity demonstrated at this stage\", \"Relationship to mouse granzymes C–G unclear\", \"Functional role entirely inferred from sequence homology\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Reconstitution of recombinant granzyme H enzymatic activity resolved whether the protein was catalytically active and defined its chymase-type substrate specificity (P1 preference for Phe, Tyr, Met), while demonstrating temperature-dependent internalization into target cell endosomes.\",\n      \"evidence\": \"Baculovirus-expressed recombinant GzmH, synthetic substrate kinetics, serine protease inhibitor profiling, fluorescence microscopy internalization assay\",\n      \"pmids\": [\"10521426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrates identified\", \"Mechanism of cell death not addressed\", \"Receptor for internalization unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Protein-level profiling with a novel monoclonal antibody established that granzyme H is constitutively abundant in NK cells—exceeding granzyme B—and is not induced by classical T cell activation stimuli, distinguishing its regulation from granzyme B.\",\n      \"evidence\": \"Monoclonal antibody generation against recombinant GzmH, flow cytometry, Western blot, and immunohistochemistry across diverse immune cell populations\",\n      \"pmids\": [\"15069086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcription factors driving NK-specific constitutive expression not identified\", \"Functional consequence of high NK expression undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Delivery of granzyme H into target cells via perforin or streptolysin O revealed a caspase-independent cell death pathway involving mitochondrial depolarization and ROS without Bid cleavage or cytochrome c release, establishing a killing mechanism distinct from granzyme B.\",\n      \"evidence\": \"Perforin/streptolysin O delivery system, flow cytometry for mitochondrial potential and ROS, immunoblot for caspase substrates\",\n      \"pmids\": [\"17409270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mitochondrial target not identified\", \"Conflicting report (PMID:17765974) found caspase activation and Bid cleavage, suggesting cell-context dependence\", \"In vivo cytotoxicity not demonstrated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of adenovirus DBP and 100K protein as direct granzyme H substrates established a dual antiviral mechanism: direct inhibition of viral DNA replication via DBP cleavage and relief of granzyme B evasion via 100K cleavage, confirmed by a GzmH-resistant DBP mutant virus.\",\n      \"evidence\": \"In vitro cleavage assays, site-directed mutagenesis generating resistant virus, viral DNA replication quantification\",\n      \"pmids\": [\"17363894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo antiadenoviral role of GzmH not tested\", \"Whether other viral proteins are substrates unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Cleavage of the host La autoantigen at Phe-364 by granzyme H identified the first non-cytolytic antiviral substrate, as truncated La lost nuclear localization and HCV-IRES translational activity, revealing a mechanism to suppress HCV replication without killing the host cell.\",\n      \"evidence\": \"In vitro cleavage with N-terminal sequencing of products, immunofluorescence for La localization, HCV-IRES luciferase reporter assay\",\n      \"pmids\": [\"19039329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effect on HCV replication in infected cells not shown\", \"Whether La cleavage occurs in vivo during HCV infection unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Crystal structures of granzyme H with substrate and inhibitor defined the structural basis of specificity: Thr189/Gly216/Gly226 shape the S1 pocket for aromatic P1 residues, and a unique RKR motif (Arg39-Lys40-Arg41) creates S3'/S4' subsites preferring acidic residues, enabling design of a selective tetrapeptide inhibitor.\",\n      \"evidence\": \"X-ray crystallography (2.2–2.7 Å), site-directed mutagenesis of RKR motif and substrates, Ac-PTSY-CMK inhibitor validation\",\n      \"pmids\": [\"22156497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length natural substrate structures in complex not determined\", \"Dynamics of the RKR loop during catalysis unexplored\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Direct cleavage of hepatitis B virus HBx protein at Met79 by granzyme H provided evidence for non-cytolytic HBV clearance, validated in vivo by adoptive transfer of GzmH-overexpressing NK cells into HBV carrier mice.\",\n      \"evidence\": \"In vitro cleavage assay, HBV replication assay, GzmH inhibitor blockade, HBx-deficient virus control, adoptive NK cell transfer in vivo\",\n      \"pmids\": [\"22156339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance in human HBV infection not confirmed\", \"Contribution of GzmH relative to other granzymes in vivo unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of SERPINB1 as a covalent suicide inhibitor of granzyme H—forming an SDS-stable complex upon cleavage at Phe343—established the first physiological regulatory mechanism, confirmed by SERPINB1 overexpression suppressing GzmH- and LAK-mediated killing.\",\n      \"evidence\": \"Crystal structures of active GzmH and SERPINB1 mutant, SDS-PAGE covalent complex detection, cytotoxicity assays with SERPINB1 overexpression\",\n      \"pmids\": [\"23269243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular compartment of SERPINB1–GzmH interaction not defined\", \"Whether other serpins regulate GzmH unknown\", \"Stoichiometry in vivo not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Further dissection confirmed that granzyme H cytotoxicity proceeds through a Bcl-2-sensitive mitochondrial pathway without requiring the apoptosome or caspase-3, while demonstrating direct DFF45/ICAD processing as a potential contributor to DNA fragmentation.\",\n      \"evidence\": \"Recombinant GzmH delivery, Bcl-2 overexpression rescue, caspase inhibitors, immunoblot for Bid/DFF45/caspase-3\",\n      \"pmids\": [\"23352961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mitochondrial target(s) remain unidentified\", \"Discrepancy with PMID:17765974 regarding Bid processing not fully resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A pathological role for granzyme H was identified in atherosclerotic cerebral small vessel disease, where NK cell-derived GzmH disrupts demyelinated nerve fibers in a process reversible by the GzmH inhibitor 3,4-DCIC, linking granzyme H to neuroinflammatory tissue damage.\",\n      \"evidence\": \"Proteomics of CSF/plasma/NK cells, blood-brain barrier transwell model, scanning electron microscopy, inhibitor rescue in vitro and in vivo\",\n      \"pmids\": [\"36006802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate in neural tissue not identified\", \"Single study requiring independent replication\", \"Mechanism of nerve fiber disruption (direct cleavage vs. indirect) not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the identity of the direct mitochondrial target(s) mediating caspase-independent cell death, the receptor(s) mediating granzyme H internalization, and the in vivo contribution of granzyme H relative to other granzymes in antiviral immunity and immunopathology.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mitochondrial target unknown\", \"Internalization receptor unidentified\", \"Relative contribution to in vivo immunity vs. granzyme B not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [6, 10, 11, 12, 13, 14, 15, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [6, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [10, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 9, 10, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 11, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SERPINB1\", \"DBP\", \"HBx\", \"SSB\"],\n    \"other_free_text\": []\n  }\n}\n```"}