{"gene":"GIMAP7","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2013,"finding":"GIMAP7 forms a homodimer via its G domains, with helical extensions protruding in opposite directions, and displays dimerization-stimulated GTP hydrolysis. A catalytic arginine is supplied in trans from one monomer to the opposing monomer to stimulate GTP hydrolysis (trans-acting arginine finger mechanism). GIMAP7 also stimulates GTP hydrolysis by GIMAP2 via an analogous heterodimerization mechanism. GIMAP7 was identified on lipid droplets.","method":"Crystal structure of GTP-bound GIMAP7, in vitro GTPase assays, site-directed mutagenesis of catalytic arginine, co-localization/lipid droplet fractionation","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with in vitro GTPase assays and mutagenesis of the catalytic residue, all in one rigorous study","pmids":["23454188"],"is_preprint":false},{"year":2022,"finding":"GIMAP6 forms a complex with GABARAPL2 and GIMAP7 to regulate GTPase activity; this tripartite complex is required for normal autophagy and redox regulation in lymphocytes.","method":"Co-immunoprecipitation, GTPase activity assays, Gimap6-/- mouse model, patient-derived cells with GIMAP6 mutations","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional genetic evidence from knockout mice and patient cells, single lab","pmids":["35551368"],"is_preprint":false},{"year":2023,"finding":"Nasal anti-CD3 (Foralumab) treatment increased GIMAP7 expression in T cells, and downstream Rho/ROCK1 GTPase signaling was concurrently downregulated, placing GIMAP7 upstream of Rho/ROCK1 in T cell inflammatory signaling.","method":"RNA-sequencing of T cells from randomized clinical trial participants treated with nasal Foralumab; pathway analysis of downstream GTPase signaling","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptomic association between GIMAP7 upregulation and Rho/ROCK1 downregulation; no direct functional manipulation of GIMAP7 itself","pmids":["36881624"],"is_preprint":false},{"year":2022,"finding":"GIMAP7 silencing in ovarian granulosa cells (KGN cells and PCOS rat model) reduced oxidative stress (decreased ROS, MDA; increased GSH, SOD), inhibited apoptosis, and promoted proliferation. GIMAP7 suppresses the sonic hedgehog (SHH) signaling pathway; inhibition of SHH with cyclopamine reversed the pro-proliferative/anti-apoptotic effects of GIMAP7 knockdown, placing GIMAP7 upstream of SHH/SMO/Gli1 signaling.","method":"siRNA knockdown in KGN cells, PCOS rat model with GIMAP7 silencing, western blot, flow cytometry, pharmacological rescue with cyclopamine (SHH inhibitor)","journal":"Journal of ovarian research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus pharmacological epistasis rescue experiment, single lab","pmids":["36581994"],"is_preprint":false},{"year":2023,"finding":"GIMAP7 overexpression in lung adenocarcinoma (LUAD) cells inhibited proliferation, migration, EMT, and glycolysis, and promoted apoptosis. GIMAP7 suppresses the Smo/AMPK signaling pathway; rescue experiments using SMO agonist SAG and AMPK agonist GSK621 restored EMT and glycolysis, confirming GIMAP7 acts through inhibition of Smo/AMPK signaling.","method":"Plasmid overexpression and siRNA knockdown in LUAD cell lines, CCK-8/EdU/colony formation/flow cytometry/wound healing/transwell assays, ECAR/OCR metabolic measurements, western blot, xenograft tumor model, pharmacological rescue","journal":"Thoracic cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal functional assays and pharmacological epistasis, single lab","pmids":["38151913"],"is_preprint":false},{"year":2025,"finding":"GIMAP7 resides within membranous organelles including the Golgi apparatus, endoplasmic reticulum, and lysosomes in lung cells. GIMAP7 directly interacts with LC3B (autophagosome marker), and this interaction converts RSV-induced incomplete autophagy flux into complete autophagy, triggering apoptosis and reducing RSV replication. GIMAP7 agonists narirutin and periplocin activate GIMAP7 expression and stimulate complete autophagy flux and apoptosis.","method":"Immunoprecipitation (GIMAP7–LC3B interaction), subcellular localization imaging, western blot, RT-qPCR, overexpression experiments, in vivo and in vitro pharmacological activation","journal":"Journal of medical virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing direct GIMAP7–LC3B interaction with functional autophagy flux readouts, single lab","pmids":["40728050"],"is_preprint":false}],"current_model":"GIMAP7 is a GTPase of the immunity-associated protein family that forms homodimers and heterodimers (notably with GIMAP2 and as part of a GIMAP6–GABARAPL2–GIMAP7 complex) to regulate GTP hydrolysis via a trans-acting catalytic arginine finger mechanism; it localizes to membranous organelles (lipid droplets, ER, Golgi, lysosomes), where it interacts directly with LC3B to promote complete autophagy flux and apoptosis, and acts upstream of the SHH/SMO and Smo/AMPK signaling pathways to suppress oxidative stress, EMT, and glycolysis in epithelial cells."},"narrative":{"mechanistic_narrative":"GIMAP7 is a GTP-hydrolyzing member of the immunity-associated protein family that uses nucleotide-dependent self-association to regulate its own and partner GTPase activity, and acts as a membrane-associated modulator of autophagy and stress signaling [PMID:23454188, PMID:35551368]. Structurally, it homodimerizes through its G domains and achieves dimerization-stimulated GTP hydrolysis via a trans-acting catalytic arginine finger, a mechanism it also extends in trans to stimulate hydrolysis by GIMAP2 [PMID:23454188]. Within cells it associates with membranous organelles including lipid droplets, the ER, Golgi, and lysosomes [PMID:23454188, PMID:40728050]. GIMAP7 functions in a tripartite GIMAP6–GABARAPL2–GIMAP7 complex required for normal autophagy and redox control in lymphocytes [PMID:35551368], and directly binds LC3B to convert incomplete autophagy flux into complete flux, coupling autophagy to apoptosis [PMID:40728050]. In epithelial contexts GIMAP7 acts upstream of hedgehog-axis signaling, suppressing SHH/SMO/Gli1 in granulosa cells and Smo/AMPK signaling in lung adenocarcinoma cells, thereby restraining oxidative stress, EMT, and glycolysis [PMID:36581994, PMID:38151913].","teleology":[{"year":2013,"claim":"Established the biochemical identity of GIMAP7 as a GTPase and defined how its catalytic activity is controlled, answering how the protein hydrolyzes GTP and acts on a family member.","evidence":"Crystal structure of GTP-bound GIMAP7 with in vitro GTPase assays and catalytic-arginine mutagenesis, plus lipid droplet fractionation","pmids":["23454188"],"confidence":"High","gaps":["Physiological trigger for homo- versus heterodimerization in cells not defined","Functional consequence of lipid-droplet localization untested","No cellular phenotype linked to the trans-arginine mechanism"]},{"year":2022,"claim":"Placed GIMAP7 in a defined protein complex with GIMAP6 and GABARAPL2 linking its GTPase activity to autophagy and redox regulation in immune cells.","evidence":"Co-IP, GTPase assays, Gimap6-/- mice and GIMAP6-mutant patient cells","pmids":["35551368"],"confidence":"Medium","gaps":["GIMAP7's individual contribution within the complex not isolated","Stoichiometry and assembly order unknown","Direct GIMAP7-GABARAPL2 contact not resolved"]},{"year":2022,"claim":"Connected GIMAP7 to hedgehog signaling, showing it acts upstream of SHH/SMO/Gli1 to control oxidative stress, apoptosis, and proliferation in granulosa cells.","evidence":"siRNA knockdown in KGN cells and a PCOS rat model with pharmacological cyclopamine rescue","pmids":["36581994"],"confidence":"Medium","gaps":["Molecular link between GIMAP7 GTPase activity and SHH pathway unresolved","Whether the effect is direct or indirect unknown","Single tissue context"]},{"year":2023,"claim":"Extended GIMAP7's signaling role to tumor suppression in lung adenocarcinoma by demonstrating it inhibits Smo/AMPK-driven EMT and glycolysis.","evidence":"Gain- and loss-of-function in LUAD lines with metabolic assays, xenografts, and SAG/GSK621 pharmacological rescue","pmids":["38151913"],"confidence":"Medium","gaps":["Direct binding partner mediating Smo/AMPK suppression unidentified","Relationship to GTPase mechanism unclear","Single lab"]},{"year":2023,"claim":"Associated GIMAP7 induction with downregulation of Rho/ROCK1 signaling in T cells, hinting at a role upstream of inflammatory GTPase pathways.","evidence":"RNA-seq of T cells from a nasal Foralumab clinical trial with pathway analysis","pmids":["36881624"],"confidence":"Low","gaps":["Transcriptomic correlation only; no direct manipulation of GIMAP7","Causality between GIMAP7 and Rho/ROCK1 not established","Mechanism unknown"]},{"year":2025,"claim":"Defined a direct GIMAP7-LC3B interaction at membranous organelles that completes autophagy flux and triggers apoptosis, linking GIMAP7 to antiviral autophagy.","evidence":"Co-IP, subcellular imaging, autophagy flux readouts, and pharmacological GIMAP7 activation (narirutin, periplocin) in RSV infection models","pmids":["40728050"],"confidence":"Medium","gaps":["LC3B-binding region of GIMAP7 not mapped","Whether GTPase activity is required for LC3B binding untested","Generality beyond RSV/lung cells unknown"]},{"year":null,"claim":"How GIMAP7's biochemical GTPase mechanism mechanistically connects to its diverse downstream roles in autophagy, hedgehog/AMPK signaling, and redox control remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying mechanism linking GTP hydrolysis to signaling outputs","No structure of GIMAP7 in complex with LC3B or signaling partners","Tissue-specific roles not reconciled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[0]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,5]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4]}],"complexes":["GIMAP6–GABARAPL2–GIMAP7 complex"],"partners":["GIMAP2","GIMAP6","GABARAPL2","LC3B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NHV1","full_name":"GTPase IMAP family member 7","aliases":["Immunity-associated nucleotide 7 protein","IAN-7"],"length_aa":300,"mass_kda":34.5,"function":"The dimer has GTPase activity; the active site contains residues from both subunits","subcellular_location":"Lipid droplet; Cytoplasm; Endoplasmic reticulum; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/Q8NHV1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GIMAP7","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GIMAP7","total_profiled":1310},"omim":[{"mim_id":"616962","title":"GTPase, IMAP FAMILY, MEMBER 8; GIMAP8","url":"https://www.omim.org/entry/616962"},{"mim_id":"616961","title":"GTPase, IMAP FAMILY, MEMBER 7; GIMAP7","url":"https://www.omim.org/entry/616961"},{"mim_id":"608085","title":"GTPase, IMAP FAMILY, MEMBER 2; GIMAP2","url":"https://www.omim.org/entry/608085"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":159.3}],"url":"https://www.proteinatlas.org/search/GIMAP7"},"hgnc":{"alias_symbol":["MGC27027","IAN7"],"prev_symbol":[]},"alphafold":{"accession":"Q8NHV1","domains":[{"cath_id":"3.40.50.300","chopping":"7-195","consensus_level":"high","plddt":94.5573,"start":7,"end":195},{"cath_id":"1.10.287","chopping":"203-280","consensus_level":"medium","plddt":96.9112,"start":203,"end":280}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NHV1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NHV1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NHV1-F1-predicted_aligned_error_v6.png","plddt_mean":92.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GIMAP7","jax_strain_url":"https://www.jax.org/strain/search?query=GIMAP7"},"sequence":{"accession":"Q8NHV1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NHV1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NHV1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NHV1"}},"corpus_meta":[{"pmid":"30586737","id":"PMC_30586737","title":"Genome-Wide Association Transethnic Meta-Analyses Identifies Novel Associations Regulating Coagulation Factor VIII and von Willebrand Factor Plasma Levels.","date":"2019","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/30586737","citation_count":136,"is_preprint":false},{"pmid":"26596891","id":"PMC_26596891","title":"Extensive variation between tissues in allele specific expression in an outbred mammal.","date":"2015","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/26596891","citation_count":70,"is_preprint":false},{"pmid":"25849251","id":"PMC_25849251","title":"Transcriptomic and proteomic analyses of splenic immune mechanisms of rainbow trout (Oncorhynchus mykiss) infected by Aeromonas salmonicida subsp. salmonicida.","date":"2015","source":"Journal of proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/25849251","citation_count":66,"is_preprint":false},{"pmid":"23454188","id":"PMC_23454188","title":"Structural insights into the mechanism of GTPase activation in the GIMAP family.","date":"2013","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/23454188","citation_count":42,"is_preprint":false},{"pmid":"31496804","id":"PMC_31496804","title":"The relevance between the immune response-related gene module and clinical traits in head and neck squamous cell carcinoma.","date":"2019","source":"Cancer management and research","url":"https://pubmed.ncbi.nlm.nih.gov/31496804","citation_count":36,"is_preprint":false},{"pmid":"36588164","id":"PMC_36588164","title":"PCSK9 facilitates melanoma pathogenesis via a network regulating tumor immunity.","date":"2023","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/36588164","citation_count":34,"is_preprint":false},{"pmid":"36881624","id":"PMC_36881624","title":"Nasal administration of anti-CD3 mAb (Foralumab) downregulates NKG7 and increases TGFB1 and GIMAP7 expression in T cells in subjects with COVID-19.","date":"2023","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/36881624","citation_count":19,"is_preprint":false},{"pmid":"32523132","id":"PMC_32523132","title":"Transcriptomic study in women with trisomy 21 identifies a possible role of the GTPases of the immunity-associated proteins (GIMAP) in the protection of breast cancer.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32523132","citation_count":16,"is_preprint":false},{"pmid":"35551368","id":"PMC_35551368","title":"GIMAP6 regulates autophagy, immune competence, and inflammation in mice and humans.","date":"2022","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35551368","citation_count":15,"is_preprint":false},{"pmid":"36581994","id":"PMC_36581994","title":"GIMAP7 induces oxidative stress and apoptosis of ovarian granulosa cells in polycystic ovary syndrome by inhibiting sonic hedgehog signalling pathway.","date":"2022","source":"Journal of ovarian research","url":"https://pubmed.ncbi.nlm.nih.gov/36581994","citation_count":13,"is_preprint":false},{"pmid":"31748878","id":"PMC_31748878","title":"Identification of GIMAP7 and Rabl3 as Putative Biomarkers for Oral Squamous Cell Carcinoma Through Comparative Proteomic Approach.","date":"2019","source":"Pathology oncology research : POR","url":"https://pubmed.ncbi.nlm.nih.gov/31748878","citation_count":9,"is_preprint":false},{"pmid":"33633776","id":"PMC_33633776","title":"Gene Banks as Reservoirs to Detect Recent Selection: The Example of the Asturiana de los Valles Bovine Breed.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33633776","citation_count":8,"is_preprint":false},{"pmid":"39889200","id":"PMC_39889200","title":"Identification of potential biomarkers associated with cuproptosis and immune microenvironment analysis in acute myocardial infarction: A 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A catalytic arginine is supplied in trans from one monomer to the opposing monomer to stimulate GTP hydrolysis (trans-acting arginine finger mechanism). GIMAP7 also stimulates GTP hydrolysis by GIMAP2 via an analogous heterodimerization mechanism. GIMAP7 was identified on lipid droplets.\",\n      \"method\": \"Crystal structure of GTP-bound GIMAP7, in vitro GTPase assays, site-directed mutagenesis of catalytic arginine, co-localization/lipid droplet fractionation\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with in vitro GTPase assays and mutagenesis of the catalytic residue, all in one rigorous study\",\n      \"pmids\": [\"23454188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GIMAP6 forms a complex with GABARAPL2 and GIMAP7 to regulate GTPase activity; this tripartite complex is required for normal autophagy and redox regulation in lymphocytes.\",\n      \"method\": \"Co-immunoprecipitation, GTPase activity assays, Gimap6-/- mouse model, patient-derived cells with GIMAP6 mutations\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional genetic evidence from knockout mice and patient cells, single lab\",\n      \"pmids\": [\"35551368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Nasal anti-CD3 (Foralumab) treatment increased GIMAP7 expression in T cells, and downstream Rho/ROCK1 GTPase signaling was concurrently downregulated, placing GIMAP7 upstream of Rho/ROCK1 in T cell inflammatory signaling.\",\n      \"method\": \"RNA-sequencing of T cells from randomized clinical trial participants treated with nasal Foralumab; pathway analysis of downstream GTPase signaling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptomic association between GIMAP7 upregulation and Rho/ROCK1 downregulation; no direct functional manipulation of GIMAP7 itself\",\n      \"pmids\": [\"36881624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GIMAP7 silencing in ovarian granulosa cells (KGN cells and PCOS rat model) reduced oxidative stress (decreased ROS, MDA; increased GSH, SOD), inhibited apoptosis, and promoted proliferation. GIMAP7 suppresses the sonic hedgehog (SHH) signaling pathway; inhibition of SHH with cyclopamine reversed the pro-proliferative/anti-apoptotic effects of GIMAP7 knockdown, placing GIMAP7 upstream of SHH/SMO/Gli1 signaling.\",\n      \"method\": \"siRNA knockdown in KGN cells, PCOS rat model with GIMAP7 silencing, western blot, flow cytometry, pharmacological rescue with cyclopamine (SHH inhibitor)\",\n      \"journal\": \"Journal of ovarian research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus pharmacological epistasis rescue experiment, single lab\",\n      \"pmids\": [\"36581994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GIMAP7 overexpression in lung adenocarcinoma (LUAD) cells inhibited proliferation, migration, EMT, and glycolysis, and promoted apoptosis. GIMAP7 suppresses the Smo/AMPK signaling pathway; rescue experiments using SMO agonist SAG and AMPK agonist GSK621 restored EMT and glycolysis, confirming GIMAP7 acts through inhibition of Smo/AMPK signaling.\",\n      \"method\": \"Plasmid overexpression and siRNA knockdown in LUAD cell lines, CCK-8/EdU/colony formation/flow cytometry/wound healing/transwell assays, ECAR/OCR metabolic measurements, western blot, xenograft tumor model, pharmacological rescue\",\n      \"journal\": \"Thoracic cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal functional assays and pharmacological epistasis, single lab\",\n      \"pmids\": [\"38151913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GIMAP7 resides within membranous organelles including the Golgi apparatus, endoplasmic reticulum, and lysosomes in lung cells. GIMAP7 directly interacts with LC3B (autophagosome marker), and this interaction converts RSV-induced incomplete autophagy flux into complete autophagy, triggering apoptosis and reducing RSV replication. GIMAP7 agonists narirutin and periplocin activate GIMAP7 expression and stimulate complete autophagy flux and apoptosis.\",\n      \"method\": \"Immunoprecipitation (GIMAP7–LC3B interaction), subcellular localization imaging, western blot, RT-qPCR, overexpression experiments, in vivo and in vitro pharmacological activation\",\n      \"journal\": \"Journal of medical virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing direct GIMAP7–LC3B interaction with functional autophagy flux readouts, single lab\",\n      \"pmids\": [\"40728050\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GIMAP7 is a GTPase of the immunity-associated protein family that forms homodimers and heterodimers (notably with GIMAP2 and as part of a GIMAP6–GABARAPL2–GIMAP7 complex) to regulate GTP hydrolysis via a trans-acting catalytic arginine finger mechanism; it localizes to membranous organelles (lipid droplets, ER, Golgi, lysosomes), where it interacts directly with LC3B to promote complete autophagy flux and apoptosis, and acts upstream of the SHH/SMO and Smo/AMPK signaling pathways to suppress oxidative stress, EMT, and glycolysis in epithelial cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GIMAP7 is a GTP-hydrolyzing member of the immunity-associated protein family that uses nucleotide-dependent self-association to regulate its own and partner GTPase activity, and acts as a membrane-associated modulator of autophagy and stress signaling [#0, #1]. Structurally, it homodimerizes through its G domains and achieves dimerization-stimulated GTP hydrolysis via a trans-acting catalytic arginine finger, a mechanism it also extends in trans to stimulate hydrolysis by GIMAP2 [#0]. Within cells it associates with membranous organelles including lipid droplets, the ER, Golgi, and lysosomes [#0, #5]. GIMAP7 functions in a tripartite GIMAP6\\u2013GABARAPL2\\u2013GIMAP7 complex required for normal autophagy and redox control in lymphocytes [#1], and directly binds LC3B to convert incomplete autophagy flux into complete flux, coupling autophagy to apoptosis [#5]. In epithelial contexts GIMAP7 acts upstream of hedgehog-axis signaling, suppressing SHH/SMO/Gli1 in granulosa cells and Smo/AMPK signaling in lung adenocarcinoma cells, thereby restraining oxidative stress, EMT, and glycolysis [#3, #4].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established the biochemical identity of GIMAP7 as a GTPase and defined how its catalytic activity is controlled, answering how the protein hydrolyzes GTP and acts on a family member.\",\n      \"evidence\": \"Crystal structure of GTP-bound GIMAP7 with in vitro GTPase assays and catalytic-arginine mutagenesis, plus lipid droplet fractionation\",\n      \"pmids\": [\"23454188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger for homo- versus heterodimerization in cells not defined\", \"Functional consequence of lipid-droplet localization untested\", \"No cellular phenotype linked to the trans-arginine mechanism\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed GIMAP7 in a defined protein complex with GIMAP6 and GABARAPL2 linking its GTPase activity to autophagy and redox regulation in immune cells.\",\n      \"evidence\": \"Co-IP, GTPase assays, Gimap6-/- mice and GIMAP6-mutant patient cells\",\n      \"pmids\": [\"35551368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GIMAP7's individual contribution within the complex not isolated\", \"Stoichiometry and assembly order unknown\", \"Direct GIMAP7-GABARAPL2 contact not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected GIMAP7 to hedgehog signaling, showing it acts upstream of SHH/SMO/Gli1 to control oxidative stress, apoptosis, and proliferation in granulosa cells.\",\n      \"evidence\": \"siRNA knockdown in KGN cells and a PCOS rat model with pharmacological cyclopamine rescue\",\n      \"pmids\": [\"36581994\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between GIMAP7 GTPase activity and SHH pathway unresolved\", \"Whether the effect is direct or indirect unknown\", \"Single tissue context\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended GIMAP7's signaling role to tumor suppression in lung adenocarcinoma by demonstrating it inhibits Smo/AMPK-driven EMT and glycolysis.\",\n      \"evidence\": \"Gain- and loss-of-function in LUAD lines with metabolic assays, xenografts, and SAG/GSK621 pharmacological rescue\",\n      \"pmids\": [\"38151913\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding partner mediating Smo/AMPK suppression unidentified\", \"Relationship to GTPase mechanism unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Associated GIMAP7 induction with downregulation of Rho/ROCK1 signaling in T cells, hinting at a role upstream of inflammatory GTPase pathways.\",\n      \"evidence\": \"RNA-seq of T cells from a nasal Foralumab clinical trial with pathway analysis\",\n      \"pmids\": [\"36881624\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Transcriptomic correlation only; no direct manipulation of GIMAP7\", \"Causality between GIMAP7 and Rho/ROCK1 not established\", \"Mechanism unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a direct GIMAP7-LC3B interaction at membranous organelles that completes autophagy flux and triggers apoptosis, linking GIMAP7 to antiviral autophagy.\",\n      \"evidence\": \"Co-IP, subcellular imaging, autophagy flux readouts, and pharmacological GIMAP7 activation (narirutin, periplocin) in RSV infection models\",\n      \"pmids\": [\"40728050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LC3B-binding region of GIMAP7 not mapped\", \"Whether GTPase activity is required for LC3B binding untested\", \"Generality beyond RSV/lung cells unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GIMAP7's biochemical GTPase mechanism mechanistically connects to its diverse downstream roles in autophagy, hedgehog/AMPK signaling, and redox control remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying mechanism linking GTP hydrolysis to signaling outputs\", \"No structure of GIMAP7 in complex with LC3B or signaling partners\", \"Tissue-specific roles not reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [\"GIMAP6\\u2013GABARAPL2\\u2013GIMAP7 complex\"],\n    \"partners\": [\"GIMAP2\", \"GIMAP6\", \"GABARAPL2\", \"LC3B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}