{"gene":"TG_270240","gene_symbol":"MAG1","run_date":"2026-09-08T14:08:29","timeline":{"discoveries":[{"year":2021,"finding":"MAG1 is a dense granular protein secreted beyond the parasitophorous vacuole into the host cytosol in both tachyzoites and bradyzoites; secretion decreases as the PV matures but MAG1 puncta persist inside host cells at 4–6 days post-infection. Δmag1 parasites showed reduced virulence, dissemination, and near-absent brain cyst formation in vivo. In bone marrow-derived macrophages, Δmag1 parasites induced significantly increased IL-1β secretion (inflammasome activation); heterologous complementation of MAG1 prevented this IL-1β release, demonstrating that cytosol-secreted MAG1 suppresses inflammasome activation. Double knockout of GRA15 in Δmag1 parasites completely abolished IL-1β release, placing MAG1 as an antagonist of GRA15-driven inflammasome induction.","method":"Immunofluorescence/subcellular fractionation (localization), gene knockout (Δmag1) with in vitro macrophage IL-1β ELISA, heterologous complementation in BMDM cells, in vivo virulence/cyst burden assays, double-knockout epistasis (Δmag1/Δgra15)","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic complementation, epistasis with GRA15 double-KO, multiple orthogonal methods (localization, KO phenotype, cytokine assay), replicated across in vitro and in vivo settings in a single rigorous study","pmids":["34006649"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2019,"finding":"Proteomic analysis of immunoprecipitated cyst wall fragments identified MAG1 as a component of the cyst wall/matrix fraction, confirming its structural association with the cyst wall.","method":"Immunoprecipitation with CST1 antibody followed by LC-MS/MS mass spectrometry on Percoll gradient-enriched cyst wall fragments","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — targeted proteomics with enrichment and immunoprecipitation, single study but with orthogonal enrichment steps","pmids":["31040239"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2013,"finding":"Immunoprecipitation of bradyzoite pseudokinase 1 (BPK1) from in vitro bradyzoite cultures identified MAG1 as one of at least four proteins associating with BPK1 in the cyst wall complex (along with MCP4, GRA8, and GRA9).","method":"Immunoprecipitation from in vitro bradyzoite cultures followed by protein identification","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP experiment identifying MAG1 as BPK1-associating partner; single lab, single method, but part of a broader mechanistic study","pmids":["23291621"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2020,"finding":"A MAG1-BirA* fusion was used as bait in proximity biotinylation to identify novel bradyzoite-upregulated secreted GRA proteins in the cyst vacuole proteome, demonstrating that MAG1 resides within the bradyzoite parasitophorous vacuole/cyst matrix and is physically proximate to dense granule secreted proteins.","method":"Proximity biotinylation (BioID) using MAG1-BirA* fusion protein in bradyzoites, followed by streptavidin pulldown and mass spectrometry","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity biotinylation with MS identification; single lab, confirms MAG1 cyst matrix localization with functional spatial context","pmids":["32374791"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2015,"finding":"Bradyzoite-specific enolase 1 (TgENO1) specifically binds to a TTTTCT DNA motif present in the MAG1 gene promoter, as shown by gel retardation assay. Direct physical interaction of nuclear TgENO1 (and TgENO2) with the MAG1 gene promoter was confirmed in vivo by chromatin immunoprecipitation (ChIP), indicating that MAG1 expression is transcriptionally regulated by parasite enolases.","method":"Gel retardation (EMSA) with recombinant TgENO1 and MAG1 promoter fragment; chromatin immunoprecipitation (ChIP) in Toxoplasma cells","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro EMSA with defined promoter motif plus in vivo ChIP confirmation; two orthogonal methods establishing direct protein-DNA interaction at the MAG1 promoter","pmids":["25760592"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":1999,"finding":"In BAG1-null (H7) bradyzoites, the 65 kDa cyst matrix antigen MAG1 was still expressed and detectable by immunofluorescence and Western blot, establishing that MAG1 expression is independent of BAG1 and that MAG1 is a 65 kDa bradyzoite cyst matrix protein.","method":"Western blot and immunofluorescence of BAG1-null T. gondii bradyzoites with MAG1 antisera","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein detection by two methods (Western blot + IFA) in isogenic KO strain; single lab","pmids":["10027984"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":"PLK"}]},{"year":2002,"finding":"Immunization of mice with recombinant MAG1 (rMAG1, expressed as a GST fusion) conferred partial protective immunity: 60% survival after cyst challenge vs. 20% with GST alone, and significantly reduced brain cyst numbers and inflammation in a chronic infection model, demonstrating that MAG1 is a protective antigen capable of eliciting functional immune responses.","method":"Bacterial expression of GST-MAG1 fusion protein; subcutaneous immunization of mice; lethal cyst challenge and brain cyst counting","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — controlled mouse immunization/challenge experiment with antigen-specific comparison; single lab, two readouts (survival and cyst burden)","pmids":["11865445"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":"ME49"}]},{"year":2025,"finding":"MAG1 protein was detected within extracellular vesicles (EVs) produced by Toxoplasma-infected neurons, indicating that MAG1 can be incorporated into and trafficked via host cell-derived EVs during cyst-stage infection.","method":"LC-MS/MS proteomics of EVs isolated from infected primary murine cortical neurons; confirmed by Western blot and TEM","journal":"PLoS pathogens","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single proteomic identification of MAG1 in neuronal EVs; no functional follow-up specific to MAG1 in this study","pmids":["40523037"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]}],"current_model":"MAG1 is a Toxoplasma gondii dense granule protein that localizes to the parasitophorous vacuolar matrix in tachyzoites and to the cyst wall and matrix in bradyzoites; it is actively secreted beyond the parasitophorous vacuole into the host cytosol, where it suppresses GRA15-driven inflammasome activation and IL-1β release, thereby dampening host immune responses to promote parasite dissemination and chronic cyst establishment. Its expression is transcriptionally regulated via direct binding of bradyzoite enolase 1 (TgENO1) to a TTTTCT motif in the MAG1 promoter, and it physically associates with the cyst wall complex partner BPK1."},"narrative":{"mechanistic_narrative":"MAG1 is a Toxoplasma gondii dense granule protein central to establishing chronic infection while dampening host innate immunity [PMID:34006649]. In tachyzoites it localizes to the parasitophorous vacuolar matrix, and in bradyzoites it is a 65 kDa cyst matrix antigen that also associates structurally with the cyst wall [PMID:10027984, PMID:31040239]. MAG1 is actively secreted beyond the parasitophorous vacuole into the host cytosol, where it functions as an antagonist of GRA15-driven inflammasome activation: Δmag1 parasites trigger elevated IL-1β release in macrophages, complementation restores suppression, and deletion of GRA15 abolishes the IL-1β response, placing MAG1 genetically upstream as a suppressor of this pathway [PMID:34006649]. Consistent with this immunomodulatory role, Δmag1 parasites show reduced virulence, impaired dissemination, and near-absent brain cyst formation in vivo [PMID:34006649]. Within the bradyzoite vacuole MAG1 resides in the cyst matrix in proximity to secreted GRA proteins and physically associates with the cyst wall complex partner BPK1 (alongside MCP4, GRA8, and GRA9) [PMID:32374791, PMID:23291621]. MAG1 expression is transcriptionally controlled through direct binding of bradyzoite enolase TgENO1 to a TTTTCT motif in the MAG1 promoter, and its expression is independent of BAG1 [PMID:25760592, PMID:10027984]. The precise biochemical mechanism by which secreted MAG1 antagonizes inflammasome signaling has not been characterized in the available corpus.","teleology":[{"year":1999,"claim":"Establishing that MAG1 is a bona fide bradyzoite cyst matrix protein whose expression does not depend on the differentiation marker BAG1 defined it as an independently regulated stage-specific antigen.","evidence":"Western blot and immunofluorescence with MAG1 antisera in BAG1-null bradyzoites","pmids":["10027984"],"confidence":"Medium","gaps":["Did not address MAG1 function or secretion","Regulatory inputs controlling MAG1 expression not identified"],"attribution":[{"species":"Toxoplasma gondii","strain":"PLK"}]},{"year":2002,"claim":"Whether MAG1 could elicit protective host immunity was untested; immunization showed recombinant MAG1 confers partial protection against chronic cyst challenge, marking it as an immunologically active antigen.","evidence":"GST-MAG1 immunization of mice followed by lethal cyst challenge and brain cyst counting","pmids":["11865445"],"confidence":"Medium","gaps":["Mechanism of protection (antibody vs cellular) not defined","Does not address the native function of MAG1 during infection"],"attribution":[{"species":"Toxoplasma gondii","strain":"ME49"}]},{"year":2013,"claim":"The physical partners of MAG1 within the cyst were unknown; co-IP of BPK1 placed MAG1 in a defined cyst wall protein complex with MCP4, GRA8, and GRA9.","evidence":"Immunoprecipitation of BPK1 from in vitro bradyzoite cultures with protein identification","pmids":["23291621"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation","Functional consequence of the BPK1-MAG1 association not determined"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2015,"claim":"How MAG1 stage-specific expression is controlled was unresolved; TgENO1 was shown to bind a TTTTCT motif in the MAG1 promoter, identifying a direct transcriptional regulator.","evidence":"EMSA with recombinant TgENO1 plus in vivo ChIP at the MAG1 promoter","pmids":["25760592"],"confidence":"High","gaps":["Functional impact of TgENO1 binding on MAG1 transcript levels in vivo not quantified","Whether other transcription factors co-regulate MAG1 unknown"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2020,"claim":"The spatial context of MAG1 in the bradyzoite vacuole was refined by BioID, confirming residence in the cyst matrix in proximity to secreted GRA proteins.","evidence":"Proximity biotinylation with MAG1-BirA* fusion in bradyzoites and MS identification","pmids":["32374791"],"confidence":"Medium","gaps":["Proximity does not establish direct binding to identified GRAs","Single-lab BioID dataset"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2021,"claim":"The functional role of MAG1 was unresolved; genetics established it as a cytosol-secreted suppressor of GRA15-driven inflammasome activation required for virulence, dissemination, and cyst formation.","evidence":"Δmag1 knockout with macrophage IL-1β ELISA, heterologous complementation, Δmag1/Δgra15 double-knockout epistasis, and in vivo virulence/cyst assays","pmids":["34006649"],"confidence":"High","gaps":["Biochemical mechanism of inflammasome suppression not defined","Direct host or parasite targets of secreted MAG1 unidentified","Mechanism linking immune suppression to cyst establishment not resolved"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2025,"claim":"MAG1 was detected in extracellular vesicles from infected neurons, raising the possibility of EV-mediated trafficking during cyst-stage infection.","evidence":"LC-MS/MS of EVs from infected primary murine cortical neurons, confirmed by Western blot and TEM","pmids":["40523037"],"confidence":"Low","gaps":["Single proteomic identification with no MAG1-specific functional follow-up","Whether EV incorporation is functionally relevant unknown"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":null,"claim":"The molecular mechanism by which secreted MAG1 antagonizes GRA15/inflammasome signaling and its direct binding partners in the host cytosol remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No direct host-cell target of secreted MAG1 identified","No structural or enzymatic activity assigned to MAG1","Mechanism of secretion beyond the PV membrane unresolved"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Cyst wall complex with BPK1, MCP4, GRA8, and GRA9"],"partners":["BPK1 (CO-IP, CYST WALL COMPLEX)","GRA15 (GENETIC ANTAGONIST OF MAG1-SUPPRESSED INFLAMMASOME ACTIVATION)","TGENO1 (TRANSCRIPTIONAL REGULATOR BINDING MAG1 PROMOTER TTTTCT MOTIF)"],"other_free_text":["65 kDa bradyzoite cyst matrix antigen; expression independent of BAG1","Recombinant MAG1 is a protective antigen conferring partial immunity against cyst challenge","Secreted beyond the parasitophorous vacuole into the host cytosol; secretion declines as the PV matures"]},"strain_conflicts":[]},"prefetch_data":{},"corpus_meta":[{"pmid":"7690809","id":"PMC_7690809","title":"Acute cerebral toxoplasmosis is induced by in vivo neutralization of TNF-alpha and correlates with the down-regulated expression of inducible nitric oxide synthase and other markers of macrophage activation.","date":"1993","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/7690809","citation_count":303,"is_preprint":false},{"pmid":"16085916","id":"PMC_16085916","title":"Seroreactivity to and avidity for recombinant antigens in toxoplasmosis.","date":"2005","source":"Clinical and diagnostic laboratory immunology","url":"https://pubmed.ncbi.nlm.nih.gov/16085916","citation_count":89,"is_preprint":false},{"pmid":"14998514","id":"PMC_14998514","title":"The Toxoplasma gondii 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Δmag1 parasites showed reduced virulence, dissemination, and near-absent brain cyst formation in vivo. In bone marrow-derived macrophages, Δmag1 parasites induced significantly increased IL-1β secretion (inflammasome activation); heterologous complementation of MAG1 prevented this IL-1β release, demonstrating that cytosol-secreted MAG1 suppresses inflammasome activation. Double knockout of GRA15 in Δmag1 parasites completely abolished IL-1β release, placing MAG1 as an antagonist of GRA15-driven inflammasome induction.\",\n      \"method\": \"Immunofluorescence/subcellular fractionation (localization), gene knockout (Δmag1) with in vitro macrophage IL-1β ELISA, heterologous complementation in BMDM cells, in vivo virulence/cyst burden assays, double-knockout epistasis (Δmag1/Δgra15)\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic complementation, epistasis with GRA15 double-KO, multiple orthogonal methods (localization, KO phenotype, cytokine assay), replicated across in vitro and in vivo settings in a single rigorous study\",\n      \"pmids\": [\"34006649\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Proteomic analysis of immunoprecipitated cyst wall fragments identified MAG1 as a component of the cyst wall/matrix fraction, confirming its structural association with the cyst wall.\",\n      \"method\": \"Immunoprecipitation with CST1 antibody followed by LC-MS/MS mass spectrometry on Percoll gradient-enriched cyst wall fragments\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — targeted proteomics with enrichment and immunoprecipitation, single study but with orthogonal enrichment steps\",\n      \"pmids\": [\"31040239\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Immunoprecipitation of bradyzoite pseudokinase 1 (BPK1) from in vitro bradyzoite cultures identified MAG1 as one of at least four proteins associating with BPK1 in the cyst wall complex (along with MCP4, GRA8, and GRA9).\",\n      \"method\": \"Immunoprecipitation from in vitro bradyzoite cultures followed by protein identification\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP experiment identifying MAG1 as BPK1-associating partner; single lab, single method, but part of a broader mechanistic study\",\n      \"pmids\": [\"23291621\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A MAG1-BirA* fusion was used as bait in proximity biotinylation to identify novel bradyzoite-upregulated secreted GRA proteins in the cyst vacuole proteome, demonstrating that MAG1 resides within the bradyzoite parasitophorous vacuole/cyst matrix and is physically proximate to dense granule secreted proteins.\",\n      \"method\": \"Proximity biotinylation (BioID) using MAG1-BirA* fusion protein in bradyzoites, followed by streptavidin pulldown and mass spectrometry\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity biotinylation with MS identification; single lab, confirms MAG1 cyst matrix localization with functional spatial context\",\n      \"pmids\": [\"32374791\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Bradyzoite-specific enolase 1 (TgENO1) specifically binds to a TTTTCT DNA motif present in the MAG1 gene promoter, as shown by gel retardation assay. Direct physical interaction of nuclear TgENO1 (and TgENO2) with the MAG1 gene promoter was confirmed in vivo by chromatin immunoprecipitation (ChIP), indicating that MAG1 expression is transcriptionally regulated by parasite enolases.\",\n      \"method\": \"Gel retardation (EMSA) with recombinant TgENO1 and MAG1 promoter fragment; chromatin immunoprecipitation (ChIP) in Toxoplasma cells\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro EMSA with defined promoter motif plus in vivo ChIP confirmation; two orthogonal methods establishing direct protein-DNA interaction at the MAG1 promoter\",\n      \"pmids\": [\"25760592\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In BAG1-null (H7) bradyzoites, the 65 kDa cyst matrix antigen MAG1 was still expressed and detectable by immunofluorescence and Western blot, establishing that MAG1 expression is independent of BAG1 and that MAG1 is a 65 kDa bradyzoite cyst matrix protein.\",\n      \"method\": \"Western blot and immunofluorescence of BAG1-null T. gondii bradyzoites with MAG1 antisera\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein detection by two methods (Western blot + IFA) in isogenic KO strain; single lab\",\n      \"pmids\": [\"10027984\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"PLK\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Immunization of mice with recombinant MAG1 (rMAG1, expressed as a GST fusion) conferred partial protective immunity: 60% survival after cyst challenge vs. 20% with GST alone, and significantly reduced brain cyst numbers and inflammation in a chronic infection model, demonstrating that MAG1 is a protective antigen capable of eliciting functional immune responses.\",\n      \"method\": \"Bacterial expression of GST-MAG1 fusion protein; subcutaneous immunization of mice; lethal cyst challenge and brain cyst counting\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — controlled mouse immunization/challenge experiment with antigen-specific comparison; single lab, two readouts (survival and cyst burden)\",\n      \"pmids\": [\"11865445\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"ME49\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MAG1 protein was detected within extracellular vesicles (EVs) produced by Toxoplasma-infected neurons, indicating that MAG1 can be incorporated into and trafficked via host cell-derived EVs during cyst-stage infection.\",\n      \"method\": \"LC-MS/MS proteomics of EVs isolated from infected primary murine cortical neurons; confirmed by Western blot and TEM\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single proteomic identification of MAG1 in neuronal EVs; no functional follow-up specific to MAG1 in this study\",\n      \"pmids\": [\"40523037\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"MAG1 is a Toxoplasma gondii dense granule protein that localizes to the parasitophorous vacuolar matrix in tachyzoites and to the cyst wall and matrix in bradyzoites; it is actively secreted beyond the parasitophorous vacuole into the host cytosol, where it suppresses GRA15-driven inflammasome activation and IL-1β release, thereby dampening host immune responses to promote parasite dissemination and chronic cyst establishment. Its expression is transcriptionally regulated via direct binding of bradyzoite enolase 1 (TgENO1) to a TTTTCT motif in the MAG1 promoter, and it physically associates with the cyst wall complex partner BPK1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAG1 is a Toxoplasma gondii dense granule protein central to establishing chronic infection while dampening host innate immunity [#0]. In tachyzoites it localizes to the parasitophorous vacuolar matrix, and in bradyzoites it is a 65 kDa cyst matrix antigen that also associates structurally with the cyst wall [#5, #1]. MAG1 is actively secreted beyond the parasitophorous vacuole into the host cytosol, where it functions as an antagonist of GRA15-driven inflammasome activation: \\u0394mag1 parasites trigger elevated IL-1\\u03b2 release in macrophages, complementation restores suppression, and deletion of GRA15 abolishes the IL-1\\u03b2 response, placing MAG1 genetically upstream as a suppressor of this pathway [#0]. Consistent with this immunomodulatory role, \\u0394mag1 parasites show reduced virulence, impaired dissemination, and near-absent brain cyst formation in vivo [#0]. Within the bradyzoite vacuole MAG1 resides in the cyst matrix in proximity to secreted GRA proteins and physically associates with the cyst wall complex partner BPK1 (alongside MCP4, GRA8, and GRA9) [#3, #2]. MAG1 expression is transcriptionally controlled through direct binding of bradyzoite enolase TgENO1 to a TTTTCT motif in the MAG1 promoter, and its expression is independent of BAG1 [#4, #5]. The precise biochemical mechanism by which secreted MAG1 antagonizes inflammasome signaling has not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that MAG1 is a bona fide bradyzoite cyst matrix protein whose expression does not depend on the differentiation marker BAG1 defined it as an independently regulated stage-specific antigen.\",\n      \"evidence\": \"Western blot and immunofluorescence with MAG1 antisera in BAG1-null bradyzoites\",\n      \"pmids\": [\"10027984\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not address MAG1 function or secretion\", \"Regulatory inputs controlling MAG1 expression not identified\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"PLK\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Whether MAG1 could elicit protective host immunity was untested; immunization showed recombinant MAG1 confers partial protection against chronic cyst challenge, marking it as an immunologically active antigen.\",\n      \"evidence\": \"GST-MAG1 immunization of mice followed by lethal cyst challenge and brain cyst counting\",\n      \"pmids\": [\"11865445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of protection (antibody vs cellular) not defined\", \"Does not address the native function of MAG1 during infection\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"ME49\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The physical partners of MAG1 within the cyst were unknown; co-IP of BPK1 placed MAG1 in a defined cyst wall protein complex with MCP4, GRA8, and GRA9.\",\n      \"evidence\": \"Immunoprecipitation of BPK1 from in vitro bradyzoite cultures with protein identification\",\n      \"pmids\": [\"23291621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Functional consequence of the BPK1-MAG1 association not determined\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"How MAG1 stage-specific expression is controlled was unresolved; TgENO1 was shown to bind a TTTTCT motif in the MAG1 promoter, identifying a direct transcriptional regulator.\",\n      \"evidence\": \"EMSA with recombinant TgENO1 plus in vivo ChIP at the MAG1 promoter\",\n      \"pmids\": [\"25760592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional impact of TgENO1 binding on MAG1 transcript levels in vivo not quantified\", \"Whether other transcription factors co-regulate MAG1 unknown\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The spatial context of MAG1 in the bradyzoite vacuole was refined by BioID, confirming residence in the cyst matrix in proximity to secreted GRA proteins.\",\n      \"evidence\": \"Proximity biotinylation with MAG1-BirA* fusion in bradyzoites and MS identification\",\n      \"pmids\": [\"32374791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proximity does not establish direct binding to identified GRAs\", \"Single-lab BioID dataset\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The functional role of MAG1 was unresolved; genetics established it as a cytosol-secreted suppressor of GRA15-driven inflammasome activation required for virulence, dissemination, and cyst formation.\",\n      \"evidence\": \"\\u0394mag1 knockout with macrophage IL-1\\u03b2 ELISA, heterologous complementation, \\u0394mag1/\\u0394gra15 double-knockout epistasis, and in vivo virulence/cyst assays\",\n      \"pmids\": [\"34006649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of inflammasome suppression not defined\", \"Direct host or parasite targets of secreted MAG1 unidentified\", \"Mechanism linking immune suppression to cyst establishment not resolved\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"MAG1 was detected in extracellular vesicles from infected neurons, raising the possibility of EV-mediated trafficking during cyst-stage infection.\",\n      \"evidence\": \"LC-MS/MS of EVs from infected primary murine cortical neurons, confirmed by Western blot and TEM\",\n      \"pmids\": [\"40523037\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single proteomic identification with no MAG1-specific functional follow-up\", \"Whether EV incorporation is functionally relevant unknown\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which secreted MAG1 antagonizes GRA15/inflammasome signaling and its direct binding partners in the host cytosol remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct host-cell target of secreted MAG1 identified\", \"No structural or enzymatic activity assigned to MAG1\", \"Mechanism of secretion beyond the PV membrane unresolved\"],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140888\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020003\", \"supporting_discovery_ids\": [0, 3], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]},\n      {\"term_id\": \"GO:0032311\", \"supporting_discovery_ids\": [1, 2, 5], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]},\n      {\"term_id\": \"GO:1903561\", \"supporting_discovery_ids\": [7], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0002862\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"complexes\": [\n      \"Cyst wall complex with BPK1, MCP4, GRA8, and GRA9\"\n    ],\n    \"partners\": [\n      \"BPK1 (co-IP, cyst wall complex)\",\n      \"GRA15 (genetic antagonist of MAG1-suppressed inflammasome activation)\",\n      \"TgENO1 (transcriptional regulator binding MAG1 promoter TTTTCT motif)\"\n    ],\n    \"other_free_text\": [\n      \"65 kDa bradyzoite cyst matrix antigen; expression independent of BAG1\",\n      \"Recombinant MAG1 is a protective antigen conferring partial immunity against cyst challenge\",\n      \"Secreted beyond the parasitophorous vacuole into the host cytosol; secretion declines as the PV matures\"\n    ]\n  },\n  \"strain_conflicts\": []\n}","audit_flag":null,"strains":[{"strain":"ME49","gene_id":"TGME49_270240","name":"MAG1","product":"MAG1","uniprot_acc":"S8F4K6","chromosome":"TGME49_chrVIII","start_pos":5311478},{"strain":"GT1","gene_id":"TGGT1_270240","name":"MAG1","product":"MAG1 protein","uniprot_acc":null,"chromosome":"TGGT1_chrVIII","start_pos":5310162},{"strain":"RH88","gene_id":"TGRH88_081140","name":null,"product":"putative MAG1","uniprot_acc":null,"chromosome":"CM023089","start_pos":10430792},{"strain":"VEG","gene_id":"TGVEG_270240","name":null,"product":"MAG1","uniprot_acc":"B9Q5Z1","chromosome":"TGVEG_chrVIII","start_pos":5325460}]}