{"gene":"PGLYRP1","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2003,"finding":"PGLYRP1 (Tag7/PGRP-S) forms a stable 1:1 complex with Hsp70; neither protein is cytotoxic alone, but the complex induces apoptotic death in tumor cell lines at subnanomolar concentrations. The minimal cytotoxic fragment of Hsp70 maps to residues 450–463 of its peptide-binding domain, and cytotoxicity requires Hsp70 ATPase activity. The complex is assembled intracellularly and secreted via the Golgi apparatus, not by granule exocytosis.","method":"Co-immunoprecipitation, in vitro cytotoxicity assays, Hsp70 deletion/mutagenesis, subcellular fractionation, secretion pathway inhibitors","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding, domain mapping mutagenesis, functional cytotoxicity assay, replicated by multiple downstream studies","pmids":["14585845"],"is_preprint":false},{"year":2003,"finding":"Mouse PGRP-S (PGLYRP1) is present in neutrophil tertiary granules. PGRP-S-deficient mice show normal phagocytic uptake of gram-positive bacteria but defective intracellular killing and digestion, demonstrating that mammalian PGRP-S functions specifically in intracellular bactericidal activity.","method":"PGRP-S-/- knockout mice, subcellular fractionation, bacterial killing assays, phagocytosis assays, cytokine measurements","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with specific cellular phenotype (intracellular killing defect) plus subcellular localization by fractionation","pmids":["12649138"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of human PGRP-S (PGLYRP1) determined at 1.70 Å resolution. The structure reveals a conserved PGRP-domain fold similar to Drosophila PGRPs; a PGN-binding cleft was identified by docking, and a PGRP-specific groove on the opposite face is proposed as an effector/signaling protein binding site. Differences from catalytic PGRPs include absence of canonical zinc-coordinating residues, consistent with no amidase activity.","method":"X-ray crystallography, structural comparison, computational docking","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure with functional comparison; single lab but rigorous structural method","pmids":["15769462"],"is_preprint":false},{"year":2007,"finding":"PGLYRP1 (Tag7/PGRP-S) is expressed on a subset of CD4+CD25+ lymphokine-activated killer cells and mediates specific contact with Hsp70 exposed on HLA-negative tumor cell surfaces, enabling subsequent FasL/Fas-triggered apoptosis. Tag7-Hsp70 interaction is blocked by minimal peptides from either partner, confirming specificity.","method":"Flow cytometry, cell-surface binding assays, competitive peptide inhibition, FasL/Fas blocking antibodies, cytotoxicity assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding competition, pathway inhibition, cytotoxicity), replicated across papers","pmids":["17551095"],"is_preprint":false},{"year":2009,"finding":"S100A4/Mts1 (metastasin) prevents assembly of the Tag7 (PGLYRP1)–Hsp70 complex in solution and disrupts pre-formed complexes, thereby inhibiting Tag7-Hsp70 cytotoxicity. Conversely, on CD4+CD25+ cytotoxic lymphocytes, Mts1 co-exposes with Tag7 and FasL, cross-links with Tag7 to the same Hsp70 on target cells, and is required for killing of HLA-negative tumor cells, revealing that Mts1 plays opposite roles in humoral versus cellular cytotoxicity.","method":"Co-immunoprecipitation, chemical cross-linking, antibody blocking, selective cell depletion, cytotoxicity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (cross-linking, antibody depletion, functional rescue) in one study with mechanistic resolution","pmids":["19666596"],"is_preprint":false},{"year":2011,"finding":"HspBP1 (Hsp70 co-chaperone) binds directly to both Hsp70 and to Tag7 (PGLYRP1). HspBP1 binding eliminates the cytotoxic activity of the Tag7-Hsp70 complex, lowers the ATP concentration required to dissociate Tag7 from Hsp70, and is co-secreted with the Tag7-Hsp70 complex by cytotoxic CD8+ lymphocytes, suggesting HspBP1 serves as a regulatory inhibitor protecting normal cells.","method":"Co-immunoprecipitation, in vitro cytotoxicity assays, ATP dissociation assays, confocal microscopy, ELISA","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding, functional cytotoxicity abrogation, mechanistic ATP assay; single lab with multiple orthogonal methods","pmids":["21247889"],"is_preprint":false},{"year":2015,"finding":"PGLYRP1 complexed with bacterially-derived peptidoglycan constitutes a potent ligand for TREM-1, inducing known TREM-1 signaling functions. Multimerization of PGLYRP1 alone (without peptidoglycan) is sufficient to activate TREM-1, demonstrating that the PGLYRP1/TREM-1 axis can be activated independently of bacterial products.","method":"Co-immunoprecipitation, TREM-1 reporter assays, PGLYRP1 multimerization constructs, functional TREM-1 activation assays","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ligand-receptor binding identification with functional validation and mechanistic dissection (peptidoglycan-dependent vs. independent activation); single lab with multiple methods","pmids":["25595774"],"is_preprint":false},{"year":2015,"finding":"Tag7 (PGLYRP1)–Hsp70 complex induces both apoptosis and necroptosis in tumor cells via TNFR1. Apoptosis proceeds through caspase-8/caspase-3 activation; inhibition of apoptosis switches cells to RIP1-dependent necroptosis. Tag7 alone can bind TNFR1 and inhibit the cytotoxic activity of the Tag7-Hsp70 complex and of TNF-α.","method":"TNFR1 blocking antibodies, caspase inhibitors, RIP1 inhibitor (necrostatin), TNFR1-binding assays, cytotoxicity assays with specific pathway inhibitors","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — pathway dissection with specific pharmacological inhibitors and receptor-binding assays; single lab, multiple orthogonal methods","pmids":["26183779"],"is_preprint":false},{"year":2015,"finding":"PGLYRP1 (Tag7) forms a complex with S100A4/Mts1 that acts as a chemoattractant, inducing chemotactic migration of NK cells preferentially; neutrophils, monocytes, CD4+ and CD8+ lymphocytes can produce this complex.","method":"Chemotaxis/migration assays, co-immunoprecipitation, flow cytometry for cell populations","journal":"Cell Cycle","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional chemotaxis assay with binding interaction, single lab, limited mechanistic depth","pmids":["26654597"],"is_preprint":false},{"year":2016,"finding":"Tag7 (PGLYRP1)–Hsp70-induced necroptosis proceeds via TNFR1→RIP1 kinase activation→elevated intracellular Ca2+→calpain activation→lysosomal membrane permeabilization→cathepsin B/D release→mitochondrial membrane depolarization→ROS production. Soluble sTNFR1 binds Tag7 and inhibits RIP1-dependent necroptosis.","method":"Specific pathway inhibitors (calpain, cathepsin, ROS scavengers), live-cell imaging of lysosomal/mitochondrial dynamics, sTNFR1 competition assay","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — detailed pathway dissection with multiple specific inhibitors, single lab","pmids":["26796882"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of camel PGRP-S (ortholog of human PGLYRP1) in ternary complex with LPS and stearic acid at high resolution reveals two distinct ligand-binding sites: LPS binds at the C-D contact interface (Site-1) forming 13 hydrogen bonds and 159 van der Waals contacts; stearic acid binds at the A-B contact (Site-2). Both ligands bind simultaneously and CPGRP-S reduces LPS/SA-induced pro-inflammatory cytokine production.","method":"X-ray crystallography, surface plasmon resonance, ELISA for cytokines","journal":"PLoS ONE","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution ternary crystal structure with SPR binding validation and functional cytokine assay; single lab","pmids":["23326499"],"is_preprint":false},{"year":2017,"finding":"Tag7 (PGLYRP1) binds to TREM-1 receptors on monocyte surfaces, triggering TNFα and IFNγ mRNA expression. These cytokines then induce IL-2 secretion by CD3+CD4+ lymphocytes, which in turn non-specifically activates three cytotoxic subpopulations (NK CD16+CD56+, CD3+CD4+, CD3+CD8+) against MHC-negative tumor cells.","method":"TREM-1 blocking antibodies, cytokine ELISA, flow cytometry, mRNA analysis, cytotoxicity assays","journal":"Journal of Innate Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor blocking with defined downstream cytokine cascade, single lab, multiple methods","pmids":["28977785"],"is_preprint":false},{"year":2020,"finding":"Tag7 (PGLYRP1) binds to TREM-1 on monocyte surfaces and triggers TNFα and IFNγ mRNA expression; this signaling requires TREM-1, as demonstrated by receptor blocking experiments.","method":"TREM-1 blocking antibodies, cytokine mRNA/protein assays, PBMC co-culture","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor-ligand blocking with downstream signaling readout, single lab","pmids":["33291689"],"is_preprint":false},{"year":2021,"finding":"Peptides derived from the N-terminal fragment of Tag7 (PGLYRP1) bind specifically to TREM-1, while C-terminal fragment peptides bind specifically to TNFR1. These peptides inhibit proinflammatory cytokine production in PBMCs and reduce lung infiltration in a mouse model of acute lung injury.","method":"Peptide-receptor binding assays, cytokine ELISA in PBMCs, mouse ALI model, histopathology","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific peptide binding with functional in vivo validation, single lab","pmids":["34681871"],"is_preprint":false},{"year":2023,"finding":"Genetic deletion of Pglyrp1 in mice decreases tumor growth and increases CD8+ T cell activation/effector phenotype, indicating an inhibitory function of PGLYRP1 in CD8+ T cells. PGLYRP1-deficient myeloid cells show defects in antigen presentation and T cell activation, indicating a proinflammatory role in myeloid cells during autoimmunity. PGLYRP1 deletion also protects against experimental autoimmune encephalomyelitis.","method":"Pglyrp1 knockout mice, tumor growth assays, flow cytometry of CD8+ T cells, antigen presentation assays, EAE model","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in two independent disease models with defined cellular phenotypes and mechanistic dissection in myeloid and T cell compartments","pmids":["37828379"],"is_preprint":false},{"year":2024,"finding":"PGLYRP1 is expressed primarily in microglia in inflamed CNS. Recombinant PGLYRP1 potentiates reactive gliosis and neuroinflammation in animal models; shRNA knockdown attenuates this response. PGLYRP1 promotes neuroinflammation via the TREM1-Syk-Erk1/2-Stat3 signaling axis in glial cells, as demonstrated by co-immunoprecipitation of PGLYRP1 with TREM1 and pathway inhibitor experiments.","method":"shRNA knockdown, recombinant protein administration, co-immunoprecipitation (PGLYRP1-TREM1), pathway inhibitors (Syk, Erk1/2, Stat3), animal neuroinflammation models, behavioral assays","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic KD, in vivo functional models with behavioral readout, and signaling pathway dissection","pmids":["38393947"],"is_preprint":false},{"year":2010,"finding":"Mouse PGLYRP-1 exhibits direct antibacterial activity against Listeria monocytogenes and other gram-positive bacteria. Administration of anti-PGLYRP1 antibody before infection increases bacterial burden and reduces IFN-γ and TNF-α production; recombinant PGLYRP1 induces TNF-α from spleen cells and enhances intracellular bacterial elimination in hepatocytes overexpressing PGLYRP1. Enhancement of bacterial elimination by rmPGLYRP1 is abrogated in TNF-α-/- mice but not IFN-γ-/- mice.","method":"Recombinant protein antibacterial assay, antibody neutralization in vivo, cytokine ELISA, overexpression in hepatocyte cells, TNF-α and IFN-γ knockout mice","journal":"Infection and Immunity","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple in vitro and in vivo methods with genetic (KO mice) validation; single lab","pmids":["21134971"],"is_preprint":false},{"year":2019,"finding":"Pglyrp1 knockout mice show altered intestinal and respiratory microbiomes; microbiota from Pglyrp1-/- mice transferred to germ-free wild-type mice confers decreased responsiveness to allergic asthma, demonstrating that PGLYRP1 enhances allergic asthma primarily through its effect on the host intestinal microbiome.","method":"Pglyrp1-/- knockout mice, germ-free mouse colonization, airway resistance measurements, IgE and cytokine assays, 16S rRNA microbiome profiling","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — germ-free colonization transfer experiment with multiple physiological readouts, mechanistic link to microbiome composition established","pmids":["31704882"],"is_preprint":false},{"year":2025,"finding":"PGLYRP1 functions as an intracellular receptor for the disaccharide motif of lysine N-acetylglucosamine N-acetylmuramic tripeptide (GMTriP-K) but not muramyl dipeptide (MDP). In macrophages, intracellular PGLYRP1 complexes with NOD2 and GEF-H1, both required for GMTriP-K-regulated gene expression. PGLYRP1 localizes to the endoplasmic reticulum and interacts with NOD2 at the Golgi upon GMTriP-K stimulation. PGLYRP1 activation by GMTriP-K protects mice from TNBS-induced colitis.","method":"Co-immunoprecipitation (PGLYRP1-NOD2-GEF-H1 complex), ligand-binding assays (GMTriP-K vs. MDP specificity), subcellular fractionation/live imaging (ER and Golgi localization), PGLYRP1-deficient macrophages, TNBS colitis mouse model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reconstitution of receptor-ligand specificity, protein complex identification by Co-IP, subcellular localization with organelle markers, in vivo disease model; single lab with multiple orthogonal methods","pmids":["39984444"],"is_preprint":false},{"year":2004,"finding":"PGLYRP1 (PGRP-S) is isolated from camel milk secreted by the lactating mammary gland, demonstrating expression outside neutrophils. The protein binds lactic acid bacteria and gram-positive bacteria with affinity comparable to human and murine orthologs. At high concentration it forms a homotrimer.","method":"Protein isolation/chromatography, bacterial binding assays, N-terminal sequencing, mass spectrometry, RT-PCR of mammary gland mRNA","journal":"Journal of Dairy Science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct protein isolation from a secretion with binding assays; single lab","pmids":["15328291"],"is_preprint":false}],"current_model":"PGLYRP1 (Tag7/PGRP-S) is a secreted innate immunity pattern recognition protein stored in neutrophil tertiary granules that kills gram-positive bacteria intracellularly; it forms a stable cytotoxic complex with Hsp70 (regulated by S100A4/Mts1 and HspBP1) that induces tumor cell apoptosis and necroptosis via TNFR1; it directly engages TREM-1 on myeloid cells to propagate proinflammatory signaling through a TREM1-Syk-Erk1/2-Stat3 axis; it functions intracellularly in macrophages as a receptor for the peptidoglycan fragment GMTriP-K, complexing with NOD2 and GEF-H1 at the Golgi to drive intestinal mucosal protection; and it shapes the host microbiome to influence susceptibility to allergic asthma and modulates both CD8+ T cell and myeloid cell responses in tumor and autoimmune contexts."},"narrative":{"mechanistic_narrative":"PGLYRP1 (Tag7/PGRP-S) is a secreted innate-immunity pattern-recognition protein that bridges direct antibacterial defense and the regulation of inflammatory and cytotoxic signaling [PMID:12649138, PMID:21134971]. Stored in neutrophil tertiary granules and also secreted by the lactating mammary gland, it binds gram-positive bacteria and is required intracellularly for the killing and digestion of phagocytosed bacteria rather than for their uptake [PMID:12649138, PMID:21134971]. Its crystal structure shows a conserved PGRP fold with a peptidoglycan-binding cleft but lacks the canonical zinc-coordinating residues of amidase-active PGRPs, consistent with a non-catalytic recognition role, and a distinct surface groove serves as an effector/signaling-protein interface [PMID:15769462]. A central activity is the assembly of a stable 1:1 cytotoxic complex with Hsp70 that is built intracellularly and secreted via the Golgi; neither protein is cytotoxic alone, but the complex kills tumor cells at subnanomolar concentrations through TNFR1, driving caspase-8/caspase-3 apoptosis or, when apoptosis is blocked, RIP1-dependent necroptosis [PMID:14585845, PMID:26183779]. Complex assembly and cytotoxicity are tuned by accessory factors: S100A4/Mts1 disrupts the soluble complex yet is required for lymphocyte-mediated killing of HLA-negative targets, while the Hsp70 co-chaperone HspBP1 abrogates cytotoxicity and protects normal cells [PMID:19666596, PMID:21247889]. Independently of Hsp70, PGLYRP1 acts as a ligand for the myeloid receptor TREM-1, propagating proinflammatory signaling—including a TREM1-Syk-Erk1/2-Stat3 axis in microglia that potentiates neuroinflammation—with its N-terminal region engaging TREM-1 and its C-terminal region engaging TNFR1 [PMID:25595774, PMID:38393947, PMID:34681871]. PGLYRP1 also operates as an intracellular receptor for the peptidoglycan fragment GMTriP-K, complexing with NOD2 and GEF-H1 at the Golgi to confer protection against experimental colitis [PMID:39984444]. Through genetic loss-of-function studies it shapes the host microbiome to influence allergic asthma and restrains CD8+ T cell activation while supporting myeloid proinflammatory function in autoimmunity [PMID:31704882, PMID:37828379].","teleology":[{"year":2003,"claim":"Established that mammalian PGRP-S is not just a bacterial sensor but an effector required for intracellular bacterial killing, defining its primary innate-immune function in neutrophils.","evidence":"PGRP-S-/- knockout mice with subcellular fractionation and bacterial killing/phagocytosis assays","pmids":["12649138"],"confidence":"High","gaps":["Molecular mechanism of intracellular killing not defined","Whether killing is direct or via downstream effectors unresolved"]},{"year":2003,"claim":"Revealed an unexpected cytotoxic activity: PGLYRP1 partners with Hsp70 to form a complex that kills tumor cells, neither component being toxic alone.","evidence":"Co-immunoprecipitation, in vitro cytotoxicity, Hsp70 deletion/mutagenesis, secretion-pathway inhibitors","pmids":["14585845"],"confidence":"High","gaps":["Receptor on target cells not yet identified","Mechanism linking Hsp70 ATPase to cytotoxicity unclear"]},{"year":2005,"claim":"Defined the structural basis of ligand recognition and showed PGLYRP1 lacks amidase catalytic residues, framing it as a non-catalytic recognition/signaling protein.","evidence":"1.70 Å X-ray crystallography with structural comparison and docking","pmids":["15769462"],"confidence":"High","gaps":["Effector groove binding partner not experimentally identified","PGN binding inferred from docking, not co-crystal"]},{"year":2007,"claim":"Connected the Hsp70 complex to cell-mediated cytotoxicity, showing PGLYRP1 on killer lymphocytes contacts surface-exposed Hsp70 on tumor cells to license FasL/Fas killing.","evidence":"Flow cytometry, competitive peptide inhibition, FasL/Fas blocking, cytotoxicity assays","pmids":["17551095"],"confidence":"High","gaps":["Relationship between this surface-contact mechanism and soluble complex cytotoxicity not fully integrated"]},{"year":2009,"claim":"Identified S100A4/Mts1 as a context-dependent regulator with opposite roles in soluble versus cell-mediated cytotoxicity, revealing combinatorial control of the complex.","evidence":"Co-IP, chemical cross-linking, antibody blocking, cell depletion, cytotoxicity assays","pmids":["19666596"],"confidence":"High","gaps":["Structural basis for the dual role not defined","How Mts1 levels are regulated in vivo unknown"]},{"year":2010,"claim":"Provided in vivo confirmation of direct antibacterial activity and tied protection to TNF-α rather than IFN-γ, distinguishing the effector cytokine dependence.","evidence":"Recombinant protein assays, antibody neutralization, TNF-α-/- and IFN-γ-/- mice, hepatocyte overexpression","pmids":["21134971"],"confidence":"High","gaps":["Mechanism by which PGLYRP1 induces TNF-α not defined","Receptor mediating cytokine induction unidentified at this stage"]},{"year":2011,"claim":"Established HspBP1 as an inhibitory co-chaperone that abrogates complex cytotoxicity, suggesting a safeguard protecting normal cells.","evidence":"Co-IP, cytotoxicity assays, ATP dissociation assays, confocal microscopy, ELISA","pmids":["21247889"],"confidence":"High","gaps":["In vivo relevance of HspBP1 protection untested","Quantitative stoichiometry of regulation unknown"]},{"year":2013,"claim":"Showed (via camel ortholog) that PGRP-S binds LPS and fatty acid at two distinct sites and dampens cytokine production, extending recognition beyond gram-positive peptidoglycan.","evidence":"Ternary X-ray crystallography with LPS/stearic acid, SPR, cytokine ELISA","pmids":["23326499"],"confidence":"High","gaps":["Whether human PGLYRP1 uses identical dual sites not directly shown","In vivo anti-inflammatory role of dual binding untested"]},{"year":2015,"claim":"Identified TREM-1 as a PGLYRP1 receptor and showed multimerization alone activates it, decoupling proinflammatory signaling from bacterial ligands.","evidence":"Co-IP, TREM-1 reporter assays, multimerization constructs","pmids":["25595774"],"confidence":"High","gaps":["Endogenous multimerization trigger in vivo unknown","Downstream signaling not dissected here"]},{"year":2015,"claim":"Dissected the death-receptor mechanism of the Hsp70 complex, showing TNFR1-dependent apoptosis with a switch to RIP1 necroptosis and an autoregulatory role for free Tag7.","evidence":"TNFR1 blocking, caspase/RIP1 inhibitors, TNFR1-binding and cytotoxicity assays","pmids":["26183779","26796882"],"confidence":"High","gaps":["Structural basis of TNFR1 engagement not resolved","Necroptosis cascade detail from medium-confidence follow-up"]},{"year":2015,"claim":"Showed the PGLYRP1–S100A4 complex acts as an NK-cell chemoattractant, adding a recruitment function to its cytotoxic roles.","evidence":"Chemotaxis/migration assays, Co-IP, flow cytometry","pmids":["26654597"],"confidence":"Medium","gaps":["Chemotactic receptor unidentified","In vivo recruitment not demonstrated"]},{"year":2017,"claim":"Mapped a TREM-1-initiated cytokine cascade in which PGLYRP1 drives monocyte TNFα/IFNγ, IL-2 from CD4+ cells, and non-specific activation of cytotoxic subsets.","evidence":"TREM-1 blocking, cytokine ELISA, flow cytometry, mRNA analysis, cytotoxicity","pmids":["28977785","33291689"],"confidence":"Medium","gaps":["Physiological context of cascade unclear","Single-lab observations"]},{"year":2021,"claim":"Localized receptor specificity to opposite ends of PGLYRP1—N-terminus to TREM-1, C-terminus to TNFR1—and showed derived peptides are anti-inflammatory in vivo.","evidence":"Peptide-receptor binding, PBMC cytokine assays, mouse acute lung injury model","pmids":["34681871"],"confidence":"Medium","gaps":["Structural validation of bipartite receptor engagement lacking","Therapeutic translation untested beyond model"]},{"year":2019,"claim":"Demonstrated that PGLYRP1 shapes host microbiome composition to promote allergic asthma, establishing an indirect, microbiota-mediated mechanism of action.","evidence":"Pglyrp1-/- mice, germ-free colonization transfer, airway resistance, IgE/cytokine, 16S profiling","pmids":["31704882"],"confidence":"High","gaps":["Microbial taxa and metabolites mediating the effect not pinpointed","Mechanism by which PGLYRP1 reshapes microbiome unclear"]},{"year":2023,"claim":"Resolved opposing cell-intrinsic roles in adaptive/autoimmune contexts: PGLYRP1 inhibits CD8+ T cell effector function while promoting myeloid proinflammatory antigen presentation.","evidence":"Pglyrp1 knockout mice, tumor growth, CD8+ T cell flow cytometry, antigen presentation assays, EAE model","pmids":["37828379"],"confidence":"High","gaps":["Receptor/ligand mediating T-cell-intrinsic inhibition not defined","How myeloid and T-cell roles are coordinated unknown"]},{"year":2024,"claim":"Defined a microglial TREM1-Syk-Erk1/2-Stat3 signaling axis through which PGLYRP1 potentiates reactive gliosis and neuroinflammation.","evidence":"shRNA knockdown, recombinant protein, PGLYRP1-TREM1 Co-IP, pathway inhibitors, animal neuroinflammation models, behavioral assays","pmids":["38393947"],"confidence":"High","gaps":["Endogenous CNS ligand/trigger of PGLYRP1 release unknown","Link to peripheral immune roles unexplored"]},{"year":2025,"claim":"Established PGLYRP1 as an intracellular peptidoglycan-fragment receptor that nucleates a NOD2/GEF-H1 complex at the Golgi to drive mucosal protection, defining a distinct organelle-based signaling mode.","evidence":"Co-IP of PGLYRP1-NOD2-GEF-H1, GMTriP-K vs MDP ligand specificity, ER/Golgi localization, PGLYRP1-deficient macrophages, TNBS colitis model","pmids":["39984444"],"confidence":"High","gaps":["Structural basis of GMTriP-K recognition unresolved","How ER-resident PGLYRP1 relocates to Golgi upon stimulation unclear"]},{"year":null,"claim":"How PGLYRP1's diverse modes—secreted Hsp70 cytotoxicity, surface TREM-1/TNFR1 signaling, and intracellular NOD2/GEF-H1 peptidoglycan sensing—are coordinated within a single cell or pathway remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking secreted, surface, and intracellular functions","Determinants selecting between cytotoxic versus signaling outputs unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[6,18]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[6,11,15]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,7]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,19]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[18]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,18]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,6,14,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[7,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,15,18]}],"complexes":["PGLYRP1-Hsp70 cytotoxic complex","PGLYRP1-NOD2-GEF-H1 complex"],"partners":["HSPA1A","S100A4","HSPBP1","TREM1","TNFRSF1A","NOD2","ARHGEF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75594","full_name":"Peptidoglycan recognition protein 1","aliases":["Peptidoglycan recognition protein short","PGRP-S"],"length_aa":196,"mass_kda":21.7,"function":"Innate immunity protein that plays several important functions in antimicrobial and antitumor defense systems. Acts as a pattern receptor that binds to murein peptidoglycans (PGN) of Gram-positive bacteria and thus provides bactericidal activity (PubMed:9707603). Forms an equimolar complex with heat shock protein HSPA1A and induces programmed cell death through apoptosis and necroptosis in tumor cell lines by activating the TNFR1 receptor on the target cell membrane (PubMed:21247889, PubMed:26183779). In addition, acts in complex with the Ca(2+)-binding protein S100A4 as a chemoattractant able to induce lymphocyte movement (PubMed:26654597). Mechanistically, this complex acts as a ligand of the chemotactic receptors CCR5 and CXCR3 which are present on the cells of the immune system (PubMed:30713770). Also promotes the activation of lymphocytes that become able to kill virus-infected cells as well as tumor cells by modulating the spectrum of their target-cell specificity (PubMed:28977785, PubMed:29083508). Induction of cytotoxicity on monocyte surface requires interaction with TREM1 receptor (PubMed:25595774, PubMed:28977785)","subcellular_location":"Secreted; Cytoplasmic granule","url":"https://www.uniprot.org/uniprotkb/O75594/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PGLYRP1","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PGLYRP1","total_profiled":1310},"omim":[{"mim_id":"608199","title":"PEPTIDOGLYCAN RECOGNITION PROTEIN 2; PGLYRP2","url":"https://www.omim.org/entry/608199"},{"mim_id":"608198","title":"PEPTIDOGLYCAN RECOGNITION PROTEIN 4; PGLYRP4","url":"https://www.omim.org/entry/608198"},{"mim_id":"608197","title":"PEPTIDOGLYCAN RECOGNITION PROTEIN 3; 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microbe","url":"https://pubmed.ncbi.nlm.nih.gov/29447691","citation_count":17,"is_preprint":false},{"pmid":"33291689","id":"PMC_33291689","title":"Cytokines TNFα, IFNγ and IL-2 Are Responsible for Signal Transmission from the Innate Immunity Protein Tag7 (PGLYRP1) to Cytotoxic Effector Lymphocytes.","date":"2020","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/33291689","citation_count":16,"is_preprint":false},{"pmid":"34066955","id":"PMC_34066955","title":"PGRP-LB: An Inside View into the Mechanism of the Amidase Reaction.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34066955","citation_count":16,"is_preprint":false},{"pmid":"33760799","id":"PMC_33760799","title":"Circulating PGLYRP1 Levels as a Potential Biomarker for Coronary Artery Disease and Heart Failure.","date":"2021","source":"Journal of cardiovascular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33760799","citation_count":15,"is_preprint":false},{"pmid":"36522831","id":"PMC_36522831","title":"Peptidoglycan recognition protein SC (PGRP-SC) shapes gut microbiota richness, diversity and composition by modulating immunity in the house fly Musca domestica.","date":"2023","source":"Insect molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/36522831","citation_count":15,"is_preprint":false},{"pmid":"15241787","id":"PMC_15241787","title":"Immunotherapy with autologous tumor cells engineered to secrete Tag7/PGRP, an innate immunity recognition molecule.","date":"2004","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/15241787","citation_count":15,"is_preprint":false},{"pmid":"36155909","id":"PMC_36155909","title":"Drosophila Relish-mediated miR-317 expression facilitates immune homeostasis restoration via inhibiting PGRP-LC.","date":"2022","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36155909","citation_count":15,"is_preprint":false},{"pmid":"20107319","id":"PMC_20107319","title":"Unexpected deeds of familiar proteins: Interplay of Hsp70, PGRP-S/Tag7 and S100A4/Mts1 in host vs. cancer combat.","date":"2010","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/20107319","citation_count":15,"is_preprint":false},{"pmid":"39984444","id":"PMC_39984444","title":"PGLYRP1-mediated intracellular peptidoglycan detection promotes intestinal mucosal protection.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39984444","citation_count":14,"is_preprint":false},{"pmid":"19218081","id":"PMC_19218081","title":"Mammalian PGRPs in the spotlight.","date":"2009","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/19218081","citation_count":14,"is_preprint":false},{"pmid":"31704882","id":"PMC_31704882","title":"The Pglyrp1-Regulated Microbiome Enhances Experimental Allergic Asthma.","date":"2019","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/31704882","citation_count":14,"is_preprint":false},{"pmid":"30708025","id":"PMC_30708025","title":"Functional characterization of short-type peptidoglycan recognition proteins (PGRPs) from silkworm Bombyx mori in innate immunity.","date":"2019","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30708025","citation_count":14,"is_preprint":false},{"pmid":"28085885","id":"PMC_28085885","title":"Inhibition of a NF-κB/Diap1 Pathway by PGRP-LF Is Required for Proper Apoptosis during Drosophila Development.","date":"2017","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28085885","citation_count":14,"is_preprint":false},{"pmid":"23326499","id":"PMC_23326499","title":"Structural insights into the dual strategy of recognition by peptidoglycan recognition protein, PGRP-S: structure of the ternary complex of PGRP-S with lipopolysaccharide and stearic acid.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23326499","citation_count":14,"is_preprint":false},{"pmid":"27991595","id":"PMC_27991595","title":"PGRP negatively regulates NOD-mediated cytokine production in rainbow trout liver cells.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27991595","citation_count":13,"is_preprint":false},{"pmid":"20067637","id":"PMC_20067637","title":"Molecular evolution of the three short PGRPs of the malaria vectors Anopheles gambiae and Anopheles arabiensis in East Africa.","date":"2010","source":"BMC evolutionary biology","url":"https://pubmed.ncbi.nlm.nih.gov/20067637","citation_count":13,"is_preprint":false},{"pmid":"30017855","id":"PMC_30017855","title":"Involvement of a short-type peptidoglycan recognition protein (PGRP) from Chinese giant salamanders Andrias davidianus in the immune response against bacterial infection.","date":"2018","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30017855","citation_count":13,"is_preprint":false},{"pmid":"23140167","id":"PMC_23140167","title":"Roles of peptidoglycan recognition protein (PGRP) in immunity and implications for novel anti-infective measures.","date":"2012","source":"Critical reviews in eukaryotic gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/23140167","citation_count":12,"is_preprint":false},{"pmid":"31444693","id":"PMC_31444693","title":"The modulation of the TREM-1/PGLYRP1/MMP-8 axis in peri-implant diseases.","date":"2019","source":"Clinical oral investigations","url":"https://pubmed.ncbi.nlm.nih.gov/31444693","citation_count":12,"is_preprint":false},{"pmid":"29121087","id":"PMC_29121087","title":"The gram-negative sensing receptor PGRP-LC contributes to grooming induction in Drosophila.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/29121087","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47326,"output_tokens":5464,"usd":0.111969,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13948,"output_tokens":5345,"usd":0.101682,"stage2_stop_reason":"end_turn"},"total_usd":0.213651,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"PGLYRP1 (Tag7/PGRP-S) forms a stable 1:1 complex with Hsp70; neither protein is cytotoxic alone, but the complex induces apoptotic death in tumor cell lines at subnanomolar concentrations. The minimal cytotoxic fragment of Hsp70 maps to residues 450–463 of its peptide-binding domain, and cytotoxicity requires Hsp70 ATPase activity. The complex is assembled intracellularly and secreted via the Golgi apparatus, not by granule exocytosis.\",\n      \"method\": \"Co-immunoprecipitation, in vitro cytotoxicity assays, Hsp70 deletion/mutagenesis, subcellular fractionation, secretion pathway inhibitors\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding, domain mapping mutagenesis, functional cytotoxicity assay, replicated by multiple downstream studies\",\n      \"pmids\": [\"14585845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mouse PGRP-S (PGLYRP1) is present in neutrophil tertiary granules. PGRP-S-deficient mice show normal phagocytic uptake of gram-positive bacteria but defective intracellular killing and digestion, demonstrating that mammalian PGRP-S functions specifically in intracellular bactericidal activity.\",\n      \"method\": \"PGRP-S-/- knockout mice, subcellular fractionation, bacterial killing assays, phagocytosis assays, cytokine measurements\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with specific cellular phenotype (intracellular killing defect) plus subcellular localization by fractionation\",\n      \"pmids\": [\"12649138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of human PGRP-S (PGLYRP1) determined at 1.70 Å resolution. The structure reveals a conserved PGRP-domain fold similar to Drosophila PGRPs; a PGN-binding cleft was identified by docking, and a PGRP-specific groove on the opposite face is proposed as an effector/signaling protein binding site. Differences from catalytic PGRPs include absence of canonical zinc-coordinating residues, consistent with no amidase activity.\",\n      \"method\": \"X-ray crystallography, structural comparison, computational docking\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure with functional comparison; single lab but rigorous structural method\",\n      \"pmids\": [\"15769462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PGLYRP1 (Tag7/PGRP-S) is expressed on a subset of CD4+CD25+ lymphokine-activated killer cells and mediates specific contact with Hsp70 exposed on HLA-negative tumor cell surfaces, enabling subsequent FasL/Fas-triggered apoptosis. Tag7-Hsp70 interaction is blocked by minimal peptides from either partner, confirming specificity.\",\n      \"method\": \"Flow cytometry, cell-surface binding assays, competitive peptide inhibition, FasL/Fas blocking antibodies, cytotoxicity assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding competition, pathway inhibition, cytotoxicity), replicated across papers\",\n      \"pmids\": [\"17551095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"S100A4/Mts1 (metastasin) prevents assembly of the Tag7 (PGLYRP1)–Hsp70 complex in solution and disrupts pre-formed complexes, thereby inhibiting Tag7-Hsp70 cytotoxicity. Conversely, on CD4+CD25+ cytotoxic lymphocytes, Mts1 co-exposes with Tag7 and FasL, cross-links with Tag7 to the same Hsp70 on target cells, and is required for killing of HLA-negative tumor cells, revealing that Mts1 plays opposite roles in humoral versus cellular cytotoxicity.\",\n      \"method\": \"Co-immunoprecipitation, chemical cross-linking, antibody blocking, selective cell depletion, cytotoxicity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (cross-linking, antibody depletion, functional rescue) in one study with mechanistic resolution\",\n      \"pmids\": [\"19666596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HspBP1 (Hsp70 co-chaperone) binds directly to both Hsp70 and to Tag7 (PGLYRP1). HspBP1 binding eliminates the cytotoxic activity of the Tag7-Hsp70 complex, lowers the ATP concentration required to dissociate Tag7 from Hsp70, and is co-secreted with the Tag7-Hsp70 complex by cytotoxic CD8+ lymphocytes, suggesting HspBP1 serves as a regulatory inhibitor protecting normal cells.\",\n      \"method\": \"Co-immunoprecipitation, in vitro cytotoxicity assays, ATP dissociation assays, confocal microscopy, ELISA\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding, functional cytotoxicity abrogation, mechanistic ATP assay; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21247889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PGLYRP1 complexed with bacterially-derived peptidoglycan constitutes a potent ligand for TREM-1, inducing known TREM-1 signaling functions. Multimerization of PGLYRP1 alone (without peptidoglycan) is sufficient to activate TREM-1, demonstrating that the PGLYRP1/TREM-1 axis can be activated independently of bacterial products.\",\n      \"method\": \"Co-immunoprecipitation, TREM-1 reporter assays, PGLYRP1 multimerization constructs, functional TREM-1 activation assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ligand-receptor binding identification with functional validation and mechanistic dissection (peptidoglycan-dependent vs. independent activation); single lab with multiple methods\",\n      \"pmids\": [\"25595774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Tag7 (PGLYRP1)–Hsp70 complex induces both apoptosis and necroptosis in tumor cells via TNFR1. Apoptosis proceeds through caspase-8/caspase-3 activation; inhibition of apoptosis switches cells to RIP1-dependent necroptosis. Tag7 alone can bind TNFR1 and inhibit the cytotoxic activity of the Tag7-Hsp70 complex and of TNF-α.\",\n      \"method\": \"TNFR1 blocking antibodies, caspase inhibitors, RIP1 inhibitor (necrostatin), TNFR1-binding assays, cytotoxicity assays with specific pathway inhibitors\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway dissection with specific pharmacological inhibitors and receptor-binding assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"26183779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PGLYRP1 (Tag7) forms a complex with S100A4/Mts1 that acts as a chemoattractant, inducing chemotactic migration of NK cells preferentially; neutrophils, monocytes, CD4+ and CD8+ lymphocytes can produce this complex.\",\n      \"method\": \"Chemotaxis/migration assays, co-immunoprecipitation, flow cytometry for cell populations\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional chemotaxis assay with binding interaction, single lab, limited mechanistic depth\",\n      \"pmids\": [\"26654597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tag7 (PGLYRP1)–Hsp70-induced necroptosis proceeds via TNFR1→RIP1 kinase activation→elevated intracellular Ca2+→calpain activation→lysosomal membrane permeabilization→cathepsin B/D release→mitochondrial membrane depolarization→ROS production. Soluble sTNFR1 binds Tag7 and inhibits RIP1-dependent necroptosis.\",\n      \"method\": \"Specific pathway inhibitors (calpain, cathepsin, ROS scavengers), live-cell imaging of lysosomal/mitochondrial dynamics, sTNFR1 competition assay\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — detailed pathway dissection with multiple specific inhibitors, single lab\",\n      \"pmids\": [\"26796882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of camel PGRP-S (ortholog of human PGLYRP1) in ternary complex with LPS and stearic acid at high resolution reveals two distinct ligand-binding sites: LPS binds at the C-D contact interface (Site-1) forming 13 hydrogen bonds and 159 van der Waals contacts; stearic acid binds at the A-B contact (Site-2). Both ligands bind simultaneously and CPGRP-S reduces LPS/SA-induced pro-inflammatory cytokine production.\",\n      \"method\": \"X-ray crystallography, surface plasmon resonance, ELISA for cytokines\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution ternary crystal structure with SPR binding validation and functional cytokine assay; single lab\",\n      \"pmids\": [\"23326499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Tag7 (PGLYRP1) binds to TREM-1 receptors on monocyte surfaces, triggering TNFα and IFNγ mRNA expression. These cytokines then induce IL-2 secretion by CD3+CD4+ lymphocytes, which in turn non-specifically activates three cytotoxic subpopulations (NK CD16+CD56+, CD3+CD4+, CD3+CD8+) against MHC-negative tumor cells.\",\n      \"method\": \"TREM-1 blocking antibodies, cytokine ELISA, flow cytometry, mRNA analysis, cytotoxicity assays\",\n      \"journal\": \"Journal of Innate Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor blocking with defined downstream cytokine cascade, single lab, multiple methods\",\n      \"pmids\": [\"28977785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tag7 (PGLYRP1) binds to TREM-1 on monocyte surfaces and triggers TNFα and IFNγ mRNA expression; this signaling requires TREM-1, as demonstrated by receptor blocking experiments.\",\n      \"method\": \"TREM-1 blocking antibodies, cytokine mRNA/protein assays, PBMC co-culture\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor-ligand blocking with downstream signaling readout, single lab\",\n      \"pmids\": [\"33291689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Peptides derived from the N-terminal fragment of Tag7 (PGLYRP1) bind specifically to TREM-1, while C-terminal fragment peptides bind specifically to TNFR1. These peptides inhibit proinflammatory cytokine production in PBMCs and reduce lung infiltration in a mouse model of acute lung injury.\",\n      \"method\": \"Peptide-receptor binding assays, cytokine ELISA in PBMCs, mouse ALI model, histopathology\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific peptide binding with functional in vivo validation, single lab\",\n      \"pmids\": [\"34681871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Genetic deletion of Pglyrp1 in mice decreases tumor growth and increases CD8+ T cell activation/effector phenotype, indicating an inhibitory function of PGLYRP1 in CD8+ T cells. PGLYRP1-deficient myeloid cells show defects in antigen presentation and T cell activation, indicating a proinflammatory role in myeloid cells during autoimmunity. PGLYRP1 deletion also protects against experimental autoimmune encephalomyelitis.\",\n      \"method\": \"Pglyrp1 knockout mice, tumor growth assays, flow cytometry of CD8+ T cells, antigen presentation assays, EAE model\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in two independent disease models with defined cellular phenotypes and mechanistic dissection in myeloid and T cell compartments\",\n      \"pmids\": [\"37828379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PGLYRP1 is expressed primarily in microglia in inflamed CNS. Recombinant PGLYRP1 potentiates reactive gliosis and neuroinflammation in animal models; shRNA knockdown attenuates this response. PGLYRP1 promotes neuroinflammation via the TREM1-Syk-Erk1/2-Stat3 signaling axis in glial cells, as demonstrated by co-immunoprecipitation of PGLYRP1 with TREM1 and pathway inhibitor experiments.\",\n      \"method\": \"shRNA knockdown, recombinant protein administration, co-immunoprecipitation (PGLYRP1-TREM1), pathway inhibitors (Syk, Erk1/2, Stat3), animal neuroinflammation models, behavioral assays\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic KD, in vivo functional models with behavioral readout, and signaling pathway dissection\",\n      \"pmids\": [\"38393947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mouse PGLYRP-1 exhibits direct antibacterial activity against Listeria monocytogenes and other gram-positive bacteria. Administration of anti-PGLYRP1 antibody before infection increases bacterial burden and reduces IFN-γ and TNF-α production; recombinant PGLYRP1 induces TNF-α from spleen cells and enhances intracellular bacterial elimination in hepatocytes overexpressing PGLYRP1. Enhancement of bacterial elimination by rmPGLYRP1 is abrogated in TNF-α-/- mice but not IFN-γ-/- mice.\",\n      \"method\": \"Recombinant protein antibacterial assay, antibody neutralization in vivo, cytokine ELISA, overexpression in hepatocyte cells, TNF-α and IFN-γ knockout mice\",\n      \"journal\": \"Infection and Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro and in vivo methods with genetic (KO mice) validation; single lab\",\n      \"pmids\": [\"21134971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Pglyrp1 knockout mice show altered intestinal and respiratory microbiomes; microbiota from Pglyrp1-/- mice transferred to germ-free wild-type mice confers decreased responsiveness to allergic asthma, demonstrating that PGLYRP1 enhances allergic asthma primarily through its effect on the host intestinal microbiome.\",\n      \"method\": \"Pglyrp1-/- knockout mice, germ-free mouse colonization, airway resistance measurements, IgE and cytokine assays, 16S rRNA microbiome profiling\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — germ-free colonization transfer experiment with multiple physiological readouts, mechanistic link to microbiome composition established\",\n      \"pmids\": [\"31704882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PGLYRP1 functions as an intracellular receptor for the disaccharide motif of lysine N-acetylglucosamine N-acetylmuramic tripeptide (GMTriP-K) but not muramyl dipeptide (MDP). In macrophages, intracellular PGLYRP1 complexes with NOD2 and GEF-H1, both required for GMTriP-K-regulated gene expression. PGLYRP1 localizes to the endoplasmic reticulum and interacts with NOD2 at the Golgi upon GMTriP-K stimulation. PGLYRP1 activation by GMTriP-K protects mice from TNBS-induced colitis.\",\n      \"method\": \"Co-immunoprecipitation (PGLYRP1-NOD2-GEF-H1 complex), ligand-binding assays (GMTriP-K vs. MDP specificity), subcellular fractionation/live imaging (ER and Golgi localization), PGLYRP1-deficient macrophages, TNBS colitis mouse model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reconstitution of receptor-ligand specificity, protein complex identification by Co-IP, subcellular localization with organelle markers, in vivo disease model; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"39984444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PGLYRP1 (PGRP-S) is isolated from camel milk secreted by the lactating mammary gland, demonstrating expression outside neutrophils. The protein binds lactic acid bacteria and gram-positive bacteria with affinity comparable to human and murine orthologs. At high concentration it forms a homotrimer.\",\n      \"method\": \"Protein isolation/chromatography, bacterial binding assays, N-terminal sequencing, mass spectrometry, RT-PCR of mammary gland mRNA\",\n      \"journal\": \"Journal of Dairy Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct protein isolation from a secretion with binding assays; single lab\",\n      \"pmids\": [\"15328291\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PGLYRP1 (Tag7/PGRP-S) is a secreted innate immunity pattern recognition protein stored in neutrophil tertiary granules that kills gram-positive bacteria intracellularly; it forms a stable cytotoxic complex with Hsp70 (regulated by S100A4/Mts1 and HspBP1) that induces tumor cell apoptosis and necroptosis via TNFR1; it directly engages TREM-1 on myeloid cells to propagate proinflammatory signaling through a TREM1-Syk-Erk1/2-Stat3 axis; it functions intracellularly in macrophages as a receptor for the peptidoglycan fragment GMTriP-K, complexing with NOD2 and GEF-H1 at the Golgi to drive intestinal mucosal protection; and it shapes the host microbiome to influence susceptibility to allergic asthma and modulates both CD8+ T cell and myeloid cell responses in tumor and autoimmune contexts.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PGLYRP1 (Tag7/PGRP-S) is a secreted innate-immunity pattern-recognition protein that bridges direct antibacterial defense and the regulation of inflammatory and cytotoxic signaling [#1, #16]. Stored in neutrophil tertiary granules and also secreted by the lactating mammary gland, it binds gram-positive bacteria and is required intracellularly for the killing and digestion of phagocytosed bacteria rather than for their uptake [#1, #16]. Its crystal structure shows a conserved PGRP fold with a peptidoglycan-binding cleft but lacks the canonical zinc-coordinating residues of amidase-active PGRPs, consistent with a non-catalytic recognition role, and a distinct surface groove serves as an effector/signaling-protein interface [#2]. A central activity is the assembly of a stable 1:1 cytotoxic complex with Hsp70 that is built intracellularly and secreted via the Golgi; neither protein is cytotoxic alone, but the complex kills tumor cells at subnanomolar concentrations through TNFR1, driving caspase-8/caspase-3 apoptosis or, when apoptosis is blocked, RIP1-dependent necroptosis [#0, #7]. Complex assembly and cytotoxicity are tuned by accessory factors: S100A4/Mts1 disrupts the soluble complex yet is required for lymphocyte-mediated killing of HLA-negative targets, while the Hsp70 co-chaperone HspBP1 abrogates cytotoxicity and protects normal cells [#4, #5]. Independently of Hsp70, PGLYRP1 acts as a ligand for the myeloid receptor TREM-1, propagating proinflammatory signaling—including a TREM1-Syk-Erk1/2-Stat3 axis in microglia that potentiates neuroinflammation—with its N-terminal region engaging TREM-1 and its C-terminal region engaging TNFR1 [#6, #15, #13]. PGLYRP1 also operates as an intracellular receptor for the peptidoglycan fragment GMTriP-K, complexing with NOD2 and GEF-H1 at the Golgi to confer protection against experimental colitis [#18]. Through genetic loss-of-function studies it shapes the host microbiome to influence allergic asthma and restrains CD8+ T cell activation while supporting myeloid proinflammatory function in autoimmunity [#17, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established that mammalian PGRP-S is not just a bacterial sensor but an effector required for intracellular bacterial killing, defining its primary innate-immune function in neutrophils.\",\n      \"evidence\": \"PGRP-S-/- knockout mice with subcellular fractionation and bacterial killing/phagocytosis assays\",\n      \"pmids\": [\"12649138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of intracellular killing not defined\", \"Whether killing is direct or via downstream effectors unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed an unexpected cytotoxic activity: PGLYRP1 partners with Hsp70 to form a complex that kills tumor cells, neither component being toxic alone.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro cytotoxicity, Hsp70 deletion/mutagenesis, secretion-pathway inhibitors\",\n      \"pmids\": [\"14585845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor on target cells not yet identified\", \"Mechanism linking Hsp70 ATPase to cytotoxicity unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the structural basis of ligand recognition and showed PGLYRP1 lacks amidase catalytic residues, framing it as a non-catalytic recognition/signaling protein.\",\n      \"evidence\": \"1.70 Å X-ray crystallography with structural comparison and docking\",\n      \"pmids\": [\"15769462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effector groove binding partner not experimentally identified\", \"PGN binding inferred from docking, not co-crystal\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected the Hsp70 complex to cell-mediated cytotoxicity, showing PGLYRP1 on killer lymphocytes contacts surface-exposed Hsp70 on tumor cells to license FasL/Fas killing.\",\n      \"evidence\": \"Flow cytometry, competitive peptide inhibition, FasL/Fas blocking, cytotoxicity assays\",\n      \"pmids\": [\"17551095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between this surface-contact mechanism and soluble complex cytotoxicity not fully integrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified S100A4/Mts1 as a context-dependent regulator with opposite roles in soluble versus cell-mediated cytotoxicity, revealing combinatorial control of the complex.\",\n      \"evidence\": \"Co-IP, chemical cross-linking, antibody blocking, cell depletion, cytotoxicity assays\",\n      \"pmids\": [\"19666596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for the dual role not defined\", \"How Mts1 levels are regulated in vivo unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided in vivo confirmation of direct antibacterial activity and tied protection to TNF-α rather than IFN-γ, distinguishing the effector cytokine dependence.\",\n      \"evidence\": \"Recombinant protein assays, antibody neutralization, TNF-α-/- and IFN-γ-/- mice, hepatocyte overexpression\",\n      \"pmids\": [\"21134971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PGLYRP1 induces TNF-α not defined\", \"Receptor mediating cytokine induction unidentified at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established HspBP1 as an inhibitory co-chaperone that abrogates complex cytotoxicity, suggesting a safeguard protecting normal cells.\",\n      \"evidence\": \"Co-IP, cytotoxicity assays, ATP dissociation assays, confocal microscopy, ELISA\",\n      \"pmids\": [\"21247889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of HspBP1 protection untested\", \"Quantitative stoichiometry of regulation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed (via camel ortholog) that PGRP-S binds LPS and fatty acid at two distinct sites and dampens cytokine production, extending recognition beyond gram-positive peptidoglycan.\",\n      \"evidence\": \"Ternary X-ray crystallography with LPS/stearic acid, SPR, cytokine ELISA\",\n      \"pmids\": [\"23326499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether human PGLYRP1 uses identical dual sites not directly shown\", \"In vivo anti-inflammatory role of dual binding untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified TREM-1 as a PGLYRP1 receptor and showed multimerization alone activates it, decoupling proinflammatory signaling from bacterial ligands.\",\n      \"evidence\": \"Co-IP, TREM-1 reporter assays, multimerization constructs\",\n      \"pmids\": [\"25595774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous multimerization trigger in vivo unknown\", \"Downstream signaling not dissected here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Dissected the death-receptor mechanism of the Hsp70 complex, showing TNFR1-dependent apoptosis with a switch to RIP1 necroptosis and an autoregulatory role for free Tag7.\",\n      \"evidence\": \"TNFR1 blocking, caspase/RIP1 inhibitors, TNFR1-binding and cytotoxicity assays\",\n      \"pmids\": [\"26183779\", \"26796882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of TNFR1 engagement not resolved\", \"Necroptosis cascade detail from medium-confidence follow-up\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed the PGLYRP1–S100A4 complex acts as an NK-cell chemoattractant, adding a recruitment function to its cytotoxic roles.\",\n      \"evidence\": \"Chemotaxis/migration assays, Co-IP, flow cytometry\",\n      \"pmids\": [\"26654597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chemotactic receptor unidentified\", \"In vivo recruitment not demonstrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mapped a TREM-1-initiated cytokine cascade in which PGLYRP1 drives monocyte TNFα/IFNγ, IL-2 from CD4+ cells, and non-specific activation of cytotoxic subsets.\",\n      \"evidence\": \"TREM-1 blocking, cytokine ELISA, flow cytometry, mRNA analysis, cytotoxicity\",\n      \"pmids\": [\"28977785\", \"33291689\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of cascade unclear\", \"Single-lab observations\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Localized receptor specificity to opposite ends of PGLYRP1—N-terminus to TREM-1, C-terminus to TNFR1—and showed derived peptides are anti-inflammatory in vivo.\",\n      \"evidence\": \"Peptide-receptor binding, PBMC cytokine assays, mouse acute lung injury model\",\n      \"pmids\": [\"34681871\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural validation of bipartite receptor engagement lacking\", \"Therapeutic translation untested beyond model\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that PGLYRP1 shapes host microbiome composition to promote allergic asthma, establishing an indirect, microbiota-mediated mechanism of action.\",\n      \"evidence\": \"Pglyrp1-/- mice, germ-free colonization transfer, airway resistance, IgE/cytokine, 16S profiling\",\n      \"pmids\": [\"31704882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Microbial taxa and metabolites mediating the effect not pinpointed\", \"Mechanism by which PGLYRP1 reshapes microbiome unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved opposing cell-intrinsic roles in adaptive/autoimmune contexts: PGLYRP1 inhibits CD8+ T cell effector function while promoting myeloid proinflammatory antigen presentation.\",\n      \"evidence\": \"Pglyrp1 knockout mice, tumor growth, CD8+ T cell flow cytometry, antigen presentation assays, EAE model\",\n      \"pmids\": [\"37828379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor/ligand mediating T-cell-intrinsic inhibition not defined\", \"How myeloid and T-cell roles are coordinated unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a microglial TREM1-Syk-Erk1/2-Stat3 signaling axis through which PGLYRP1 potentiates reactive gliosis and neuroinflammation.\",\n      \"evidence\": \"shRNA knockdown, recombinant protein, PGLYRP1-TREM1 Co-IP, pathway inhibitors, animal neuroinflammation models, behavioral assays\",\n      \"pmids\": [\"38393947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous CNS ligand/trigger of PGLYRP1 release unknown\", \"Link to peripheral immune roles unexplored\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established PGLYRP1 as an intracellular peptidoglycan-fragment receptor that nucleates a NOD2/GEF-H1 complex at the Golgi to drive mucosal protection, defining a distinct organelle-based signaling mode.\",\n      \"evidence\": \"Co-IP of PGLYRP1-NOD2-GEF-H1, GMTriP-K vs MDP ligand specificity, ER/Golgi localization, PGLYRP1-deficient macrophages, TNBS colitis model\",\n      \"pmids\": [\"39984444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of GMTriP-K recognition unresolved\", \"How ER-resident PGLYRP1 relocates to Golgi upon stimulation unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PGLYRP1's diverse modes—secreted Hsp70 cytotoxicity, surface TREM-1/TNFR1 signaling, and intracellular NOD2/GEF-H1 peptidoglycan sensing—are coordinated within a single cell or pathway remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking secreted, surface, and intracellular functions\", \"Determinants selecting between cytotoxic versus signaling outputs unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [6, 18]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [6, 11, 15]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 19]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 6, 14, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 15, 18]}\n    ],\n    \"complexes\": [\n      \"PGLYRP1-Hsp70 cytotoxic complex\",\n      \"PGLYRP1-NOD2-GEF-H1 complex\"\n    ],\n    \"partners\": [\n      \"HSPA1A\",\n      \"S100A4\",\n      \"HSPBP1\",\n      \"TREM1\",\n      \"TNFRSF1A\",\n      \"NOD2\",\n      \"ARHGEF2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}