{"gene":"GLMN","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2002,"finding":"Glomulin (GLMN) was identified as the gene responsible for glomuvenous malformations (GVMs). Germline truncating mutations (14 different mutations in 19 exons) cause loss of function, and a somatic 'second hit' mutation was found in affected tissue, consistent with Knudson's two-hit model. The phenotype of abnormal vascular smooth-muscle-like glomus cells in GVMs suggests glomulin plays a role in VSMC differentiation and vascular morphogenesis in cutaneous veins.","method":"Positional cloning, mutation analysis, linkage disequilibrium mapping, identification of somatic second-hit mutation in lesional tissue","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic methods (linkage, mutation screening, somatic second-hit), replicated across many families, foundational discovery paper","pmids":["11845407"],"is_preprint":false},{"year":1996,"finding":"FAP48 (GLMN short isoform) was identified as a protein that specifically interacts with immunophilins FKBP59 and FKBP12. The interaction occurs via the drug-binding domain of the FKBPs and is prevented by FK506 and rapamycin in a dose-dependent manner, suggesting FAP48 shares or overlaps the macrolide binding site on these immunophilins.","method":"Yeast two-hybrid screen, in vitro binding assay, in vivo co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro and in vivo binding confirmation, single lab, two orthogonal methods","pmids":["8955134"],"is_preprint":false},{"year":2001,"finding":"FAP68 (the full-length GLMN isoform, 68 kDa) was identified as a ligand-regulated binding partner of the hepatocyte growth factor receptor (Met/c-Met). FAP68 binds specifically to the inactive (unphosphorylated) form of Met via its last 30 C-terminal amino acids, is released upon HGF stimulation and receptor phosphorylation, and free FAP68 specifically stimulates p70 S6 kinase (p70S6K) activity. Non-phosphorylated Met prevents FAP68 from stimulating p70S6K.","method":"Yeast two-hybrid, co-immunoprecipitation of endogenous proteins, in vitro binding, kinase activity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with endogenous proteins, yeast two-hybrid, functional kinase assay; single lab, multiple orthogonal methods","pmids":["11571281"],"is_preprint":false},{"year":2003,"finding":"p185 (CUL7) forms an SCF-like multiprotein complex with Skp1, Rbx1, Fbw6 (Fbx29), and FAP68/FAP48 (glomulin/GLMN). Targeted disruption of Cul7 in mice results in abnormal vascular morphogenesis and placental defects, linking the complex to vascular development.","method":"Co-immunoprecipitation (complex purification), targeted gene disruption (knockout mouse), histopathology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP establishing complex membership, in vivo knockout phenotype; single lab but multiple methods","pmids":["12904573"],"is_preprint":false},{"year":2003,"finding":"Overexpression of FAP48 (GLMN) in Jurkat T cells inhibits cellular proliferation (similar to FK506 exposure) and increases IL-2 production. FAP48 overexpression modifies expression of argininosuccinate synthetase and the Myc antagonist Mxi1, suggesting these as mediators of the antiproliferative effect. FAP48 does not affect calcineurin/NFAT1 or JNK/p38 pathways.","method":"Doxycycline-inducible overexpression in Jurkat T cells, proliferation assay, cytokine measurement, gene expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean inducible overexpression system with multiple functional readouts; single lab","pmids":["12604780"],"is_preprint":false},{"year":2012,"finding":"Glomulin (GLMN) binds directly to the RING domain of Rbx1 and inhibits CRL1 (SCF) E3 ubiquitin ligase activity. Loss of GLMN results in decreased levels of Fbw7 and increased levels of Cyclin E and c-Myc due to enhanced CRL1(Fbw7)-mediated Fbw7 turnover. GLMN thus modulates the autoubiquitination and stability of the substrate receptor Fbw7.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, protein level analysis in cells/tissues/GVM lesions, proteasome inhibitor experiments","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding demonstrated, in vitro ubiquitination assay, loss-of-function in multiple cell/tissue contexts, mechanistic pathway validated by proteasome inhibitor rescue; multiple orthogonal methods","pmids":["22405651"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of a GLMN–RBX1–CUL1 complex was solved. GLMN adopts a HEAT-like repeat fold and tightly binds the E2-interacting surface of RBX1, thereby inhibiting CRL-mediated ubiquitin chain formation by the E2 CDC34. The structure explains GLMN's selectivity for RBX1 over RBX2, and demonstrates how disease-associated GVM mutations disrupt GLMN–RBX1 interactions.","method":"X-ray crystallography, in vitro ubiquitination chain formation assay, mutagenesis of disease-associated residues, small-angle X-ray scattering (SAXS)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with biochemical validation (in vitro assay + mutagenesis) in a single rigorous study; mechanistically definitive","pmids":["22748924"],"is_preprint":false},{"year":2013,"finding":"Somatic uniparental isodisomy (aUPID) of chromosome 1p, rendering the inherited glomulin mutation homozygous in affected tissue, is the predominant second-hit mechanism in glomuvenous malformation lesions (identified in 16 somatic events). This demonstrates that complete biallelic loss of GLMN function is required to trigger GVM formation.","method":"Allele-specific pairwise SNP-chip analysis, direct sequencing of lesional DNA vs. blood DNA","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic analysis of multiple lesions with sensitive pairwise SNP-chip method, multiple independent cases confirming the mechanism","pmids":["23375657"],"is_preprint":false},{"year":2014,"finding":"GLMN (glomulin) is a substrate target of the Shigella E3 ubiquitin ligase effector IpaH7.8. IpaH7.8 ubiquitinates GLMN and promotes its degradation, which activates NLRP3 and NLRC4 inflammasomes and caspase-1, leading to macrophage pyroptosis. GLMN overexpression reduced inflammasome activation, while GLMN knockdown or haploinsufficiency (GLMN+/- mice) enhanced it. GLMN puncta colocalize with active caspase-1 upon LPS/ATP stimulation.","method":"Bacterial infection assays with IpaH7.8 mutants, overexpression and siRNA knockdown of GLMN, GLMN+/- mouse macrophages, caspase-1 activation assay, co-localization by fluorescence microscopy, in vivo infection model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic, pharmacological, imaging, in vivo mouse model), gain- and loss-of-function both tested, E3 ligase-null mutant control","pmids":["25246571"],"is_preprint":false},{"year":2017,"finding":"GLMN specifically binds the RING domains of cellular inhibitor of apoptosis proteins cIAP1 and cIAP2, inhibiting their self-ubiquitination (auto-ubiquitination) E3 ligase activity. Loss of GLMN (via IpaH7.8-mediated degradation or siRNA knockdown) enhances cIAP-mediated inflammasome activation in response to multiple stimuli (Shigella, Salmonella, Pseudomonas infection; NLRP3 activators SiO2, alum, MSU; AIM2 activator poly dA:dT), establishing GLMN as a negative regulator of cIAP-driven inflammasome activation.","method":"Co-immunoprecipitation (GLMN with cIAP1/2 RING domains), in vitro self-ubiquitination assay, siRNA knockdown, bacterial infection assays with multiple pathogens, inflammasome activation assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding demonstrated by co-IP, in vitro E3 activity assay, multiple loss-of-function approaches, broad stimulus panel; single lab but multiple orthogonal methods and robust controls","pmids":["29191979"],"is_preprint":false},{"year":2001,"finding":"Mutation of proline 219 to alanine in FAP48 (GLMN) abolishes its interaction with FKBP12 and FKBP52, identifying a cysteinyl-prolyl motif at proline 219 as essential for FKBP binding.","method":"Yeast two-hybrid with sequential point mutagenesis of proline residues","journal":"Regulatory peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — site-directed mutagenesis with functional interaction readout; single lab, single method","pmids":["11164950"],"is_preprint":false},{"year":2019,"finding":"FKBP51 and FKBP12.6 were identified as novel, tight binding partners of glomulin (GLMN) in vitro; the previously reported FKBP12 interaction was found to be comparatively weak. Two amino acids lining the FK506-binding site of FKBP51 are essential for glomulin binding, and FKBP ligands block the FKBP51–GLMN interaction.","method":"In vitro binding analysis, binding affinity measurements of full-length and truncated FKBP mutants, mutagenesis of FK506-binding site residues","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding assays with mutagenesis; single lab, multiple FKBP variants tested","pmids":["31490997"],"is_preprint":false},{"year":2019,"finding":"GLMN knockdown in melanocytic MNT-1 cells increased melanin concentration, increased proportion of mature (stage III/IV) melanosomes, and upregulated microphthalmia-associated transcription factor (MITF) and tyrosinase while downregulating phosphorylated p70S6K, implicating GLMN in the regulation of melanogenesis via the p70S6K pathway.","method":"siRNA knockdown in human MNT-1 melanocytic cells, melanin quantification, immunofluorescence, transmission electron microscopy, Western blotting","journal":"The British journal of dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple cellular readouts and pathway marker analysis; single lab","pmids":["38489583"],"is_preprint":false},{"year":2025,"finding":"Glucocorticoid receptor NR3C1 represses GLMN transcription under stress conditions; reduced GLMN prevents FKBP12.6 ubiquitination and degradation, leading to calcium leakage and overload, which impairs mitochondrial quality control and damages cardiomyocytes. ChIP-qPCR and siRNA knockdown confirmed that NR3C1 is an upstream repressor of GLMN, and that GLMN mediates FKBP12.6 ubiquitination.","method":"Mouse restraint stress models (acute and chronic), ChIP-qPCR, siRNA knockdown of NR3C1 and GLMN, Western blotting, transmission electron microscopy, cardiac functional assessment","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR for direct promoter occupancy, siRNA loss-of-function, in vivo mouse model; single lab, multiple orthogonal methods","pmids":["40943170"],"is_preprint":false},{"year":2012,"finding":"FAP48 (GLMN) overexpression in adipocytes alters adipogenesis by acting on both calcineurin and glucocorticoid pathways, and modulates the capacity of certain HIV drugs (Saquinavir and Efavirenz, but not Stavudine, Amprenavir, or Indinavir) to inhibit adipocyte formation.","method":"Stable overexpression in cell line, adipogenesis assay, drug treatment experiments","journal":"Journal of cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single overexpression study with functional readout but limited mechanistic resolution; single lab, single method type","pmids":["22678819"],"is_preprint":false},{"year":2019,"finding":"GLMN variants (p.Pro254Arg and p.Glu544*) identified in Blue Rubber Bleb Nevus Syndrome patients increased phosphorylation of mTOR at Ser-2448 when expressed in HUVECs compared to wild-type GLMN, suggesting that loss-of-function GLMN variants activate mTOR signaling.","method":"Overexpression of variant constructs in HUVECs, immunoblotting for phospho-mTOR","journal":"Combinatorial chemistry & high throughput screening","confidence":"Low","confidence_rationale":"Tier 3 / Weak — overexpression assay with single pathway readout; single lab, single method","pmids":["31793416"],"is_preprint":false}],"current_model":"Glomulin (GLMN) is a HEAT-repeat scaffold protein that functions as a selective inhibitor of RBX1-containing Cullin-RING ligases (CRLs): its crystal structure reveals that it masks the E2-binding surface of RBX1, blocking CDC34-mediated ubiquitin chain formation and thereby stabilizing CRL1 substrates including Fbw7; it also binds the RING domains of cIAP1/2 to suppress inflammasome activation, interacts with FKBPs (especially FKBP51/12.6) in an FK506-sensitive manner, and associates with the inactive HGF receptor (Met) to modulate p70S6K signaling, with complete biallelic loss of GLMN—through inherited plus somatic second-hit mutations—causing glomuvenous malformations by disrupting vascular smooth muscle cell differentiation."},"narrative":{"mechanistic_narrative":"Glomulin (GLMN) is a HEAT-repeat scaffold protein that acts as a selective inhibitor of RING-domain E3 ubiquitin ligases and, through this activity, governs vascular smooth muscle cell differentiation, inflammasome control, and several signaling outputs [PMID:22405651, PMID:22748924, PMID:29191979]. Its best-defined role is as a direct binder of the RING protein RBX1 within Cullin-RING ligase 1 (CRL1/SCF): the GLMN-RBX1-CUL1 crystal structure shows GLMN masking the E2-interacting surface of RBX1, thereby blocking CDC34-mediated ubiquitin chain formation and selectively inhibiting CRL1 over RBX2-containing ligases [PMID:22748924]. By restraining CRL1, GLMN limits autoubiquitination and turnover of the substrate receptor Fbw7, so that GLMN loss lowers Fbw7 and elevates Cyclin E and c-Myc [PMID:22405651]. GLMN extends this inhibitory logic to other RING ligases, binding the RING domains of cIAP1/cIAP2 to suppress their self-ubiquitination and thereby acting as a negative regulator of cIAP-driven NLRP3/NLRC4/AIM2 inflammasome activation; the Shigella effector IpaH7.8 ubiquitinates and degrades GLMN to unleash inflammasome activation and pyroptosis [PMID:25246571, PMID:29191979]. GLMN also interacts with the immunophilins FKBP51/FKBP12.6 (and more weakly FKBP12) through their FK506-binding pocket, an interaction blocked by FKBP ligands [PMID:8955134, PMID:31490997], and associates with the inactive HGF receptor Met to modulate p70S6K signaling [PMID:11571281]. Complete biallelic loss of GLMN — an inherited truncating mutation plus a somatic second hit, predominantly through uniparental isodisomy of 1p — causes glomuvenous malformations by disrupting vascular smooth-muscle-like glomus cell differentiation [PMID:11845407, PMID:23375657].","teleology":[{"year":2002,"claim":"Established GLMN as a disease gene by showing that loss-of-function mutations cause glomuvenous malformations, linking the protein to vascular smooth muscle differentiation before any molecular function was known.","evidence":"Positional cloning, mutation screening, and identification of a somatic second-hit in lesional tissue across many families","pmids":["11845407"],"confidence":"High","gaps":["No molecular mechanism for how GLMN loss disrupts VSMC differentiation","Biochemical activity of the protein unknown at this stage"]},{"year":1996,"claim":"First identified a GLMN binding partner, showing the short isoform engages FKBP immunophilins at their drug-binding site, hinting at a link to immunosuppressant-sensitive pathways.","evidence":"Yeast two-hybrid plus in vitro and in vivo co-immunoprecipitation with FKBP59/FKBP12","pmids":["8955134"],"confidence":"Medium","gaps":["Functional consequence of FKBP binding not defined","Did not distinguish which FKBPs bind most tightly"]},{"year":2001,"claim":"Connected GLMN to receptor tyrosine kinase signaling by showing it binds inactive Met and, upon release, stimulates p70S6K, providing a candidate signaling output.","evidence":"Yeast two-hybrid, reciprocal endogenous co-IP, in vitro binding, and kinase activity assay","pmids":["11571281"],"confidence":"Medium","gaps":["Direct mechanism of p70S6K stimulation by free GLMN unresolved","Physiological relevance to vascular disease not established"]},{"year":2001,"claim":"Mapped the FKBP interaction to a defined residue, refining the molecular basis of immunophilin binding.","evidence":"Yeast two-hybrid with proline point mutagenesis (P219A) abolishing FKBP12/FKBP52 binding","pmids":["11164950"],"confidence":"Medium","gaps":["Single interaction readout without structural validation","Functional role of the FKBP-GLMN complex still unknown"]},{"year":2003,"claim":"Placed GLMN within an SCF-like ubiquitin ligase complex and tied that complex to vascular morphogenesis, an early clue that GLMN operates in the ubiquitin system.","evidence":"Co-IP complex purification with CUL7/Skp1/Rbx1/Fbw6 and Cul7-knockout mouse phenotyping","pmids":["12904573"],"confidence":"Medium","gaps":["Whether GLMN regulates or is merely a passenger of the complex not determined","No biochemical role for GLMN in ligase activity yet"]},{"year":2003,"claim":"Showed cellular consequences of GLMN overexpression on proliferation and IL-2, with candidate downstream effectors, while excluding calcineurin/NFAT and stress kinase pathways.","evidence":"Doxycycline-inducible overexpression in Jurkat T cells with proliferation, cytokine, and gene-expression readouts","pmids":["12604780"],"confidence":"Medium","gaps":["Mechanism connecting GLMN to ASS/Mxi1 expression unknown","Overexpression context may not reflect endogenous function"]},{"year":2012,"claim":"Defined GLMN's core biochemical function: direct RBX1 binding that inhibits CRL1 activity and stabilizes the substrate receptor Fbw7, explaining downstream Cyclin E and c-Myc control.","evidence":"Co-IP, in vitro ubiquitination assays, loss-of-function protein-level analysis, and proteasome-inhibitor rescue","pmids":["22405651"],"confidence":"High","gaps":["Full set of CRL1 substrates regulated through GLMN not enumerated","How GLMN abundance is controlled in vivo unaddressed"]},{"year":2012,"claim":"Provided the structural mechanism, showing GLMN's HEAT-repeat fold masks the E2-binding surface of RBX1 to block CDC34, explaining both its CRL selectivity and how GVM mutations break the interaction.","evidence":"X-ray crystallography of GLMN-RBX1-CUL1 with in vitro chain-formation assays, disease-residue mutagenesis, and SAXS","pmids":["22748924"],"confidence":"High","gaps":["Does not address GLMN's RING-binding outside the CRL context","Cellular regulation of GLMN-RBX1 association not captured"]},{"year":2013,"claim":"Demonstrated that complete biallelic GLMN loss is required for GVM, identifying somatic uniparental isodisomy of 1p as the predominant second-hit mechanism.","evidence":"Allele-specific SNP-chip analysis and direct sequencing of lesional versus blood DNA across multiple lesions","pmids":["23375657"],"confidence":"High","gaps":["Cell type in which GLMN loss initiates the lesion not pinpointed","Link from CRL1 dysregulation to glomus cell phenotype not mechanistically traced"]},{"year":2014,"claim":"Revealed GLMN as a target of pathogen subversion, with Shigella IpaH7.8 degrading GLMN to activate inflammasomes and pyroptosis, establishing GLMN as a brake on innate immune activation.","evidence":"Bacterial infection with IpaH7.8 mutants, GLMN gain/loss-of-function, GLMN+/- mouse macrophages, caspase-1 and colocalization assays, and an in vivo model","pmids":["25246571"],"confidence":"High","gaps":["Direct molecular target of GLMN in inflammasome control not yet identified in this study","Whether the same axis operates in vascular tissue unknown"]},{"year":2017,"claim":"Identified the molecular target of GLMN's inflammasome control, showing it binds cIAP1/2 RING domains to inhibit their autoubiquitination, generalizing GLMN's RING-ligase inhibitory mode beyond RBX1.","evidence":"Co-IP of GLMN with cIAP RING domains, in vitro self-ubiquitination assays, siRNA, and broad pathogen/agonist inflammasome panel","pmids":["29191979"],"confidence":"High","gaps":["How GLMN selects among RING E3s in vivo not resolved","Quantitative balance between CRL1 and cIAP regulation by endogenous GLMN unclear"]},{"year":2019,"claim":"Refined the GLMN-immunophilin interaction map, establishing FKBP51 and FKBP12.6 as the tight partners and localizing the contact to the FK506-binding pocket.","evidence":"In vitro binding and affinity measurements with full-length and truncated FKBP variants and FK506-pocket mutagenesis","pmids":["31490997"],"confidence":"Medium","gaps":["Cellular function of the FKBP51/12.6-GLMN complex not defined","No structure of the GLMN-FKBP complex"]},{"year":2019,"claim":"Extended GLMN's p70S6K-linked function to melanogenesis, showing GLMN knockdown raises melanin, mature melanosomes, MITF and tyrosinase while lowering phospho-p70S6K.","evidence":"siRNA knockdown in MNT-1 melanocytic cells with melanin quantification, imaging, EM, and pathway immunoblotting","pmids":["38489583"],"confidence":"Medium","gaps":["Direct biochemical link between GLMN and p70S6K phosphorylation in melanocytes unproven","Whether ubiquitin-ligase inhibition underlies this phenotype not tested"]},{"year":2025,"claim":"Positioned GLMN within a stress-responsive transcriptional and calcium-handling axis, showing glucocorticoid receptor NR3C1 represses GLMN and that GLMN mediates FKBP12.6 ubiquitination affecting cardiomyocyte calcium homeostasis.","evidence":"Mouse restraint stress models, ChIP-qPCR, NR3C1/GLMN siRNA, immunoblotting, EM, and cardiac functional assessment","pmids":["40943170"],"confidence":"Medium","gaps":["Which E3 ligase GLMN engages to drive FKBP12.6 ubiquitination not identified","Direct versus indirect role of GLMN in calcium leak unresolved"]},{"year":null,"claim":"How GLMN's distinct molecular activities — CRL1 inhibition, cIAP inhibition, FKBP binding, and Met/p70S6K modulation — are integrated to produce the tissue-specific vascular smooth muscle phenotype of glomuvenous malformation remains unresolved.","evidence":"No single study connects the biochemical inhibitor functions to the differentiation defect in glomus cells","pmids":[],"confidence":"Medium","gaps":["No causal chain from CRL1/Fbw7 dysregulation to VSMC differentiation failure","Relative contribution of each GLMN interaction to disease unknown","No in vivo conditional models dissecting individual GLMN activities"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6,9]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5,9]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,5]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,6,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,7]}],"complexes":["CRL1/SCF (RBX1-CUL1)","CUL7 SCF-like complex"],"partners":["RBX1","CUL1","FBXW7","BIRC2","BIRC3","FKBP5","FKBP1B","MET"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92990","full_name":"Glomulin","aliases":["FK506-binding protein-associated protein","FAP","FKBP-associated protein"],"length_aa":594,"mass_kda":68.2,"function":"Regulatory component of cullin-RING-based SCF (SKP1-Cullin-F-box protein) E3 ubiquitin-protein ligase complexes (PubMed:22405651, PubMed:22748924). Inhibits E3 ubiquitin ligase activity by binding to RBX1 (via RING domain) and inhibiting its interaction with the E2 ubiquitin-conjugating enzyme CDC34 (PubMed:22405651, PubMed:22748924). Inhibits RBX1-mediated neddylation of CUL1 (PubMed:22405651). Required for normal stability and normal cellular levels of key components of SCF ubiquitin ligase complexes, including FBXW7, RBX1, CUL1, CUL2, CUL3, CUL4A, and thereby contributes to the regulation of CCNE1 and MYC levels (By similarity). Essential for normal development of the vasculature (PubMed:11845407). 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Germline truncating mutations (14 different mutations in 19 exons) cause loss of function, and a somatic 'second hit' mutation was found in affected tissue, consistent with Knudson's two-hit model. The phenotype of abnormal vascular smooth-muscle-like glomus cells in GVMs suggests glomulin plays a role in VSMC differentiation and vascular morphogenesis in cutaneous veins.\",\n      \"method\": \"Positional cloning, mutation analysis, linkage disequilibrium mapping, identification of somatic second-hit mutation in lesional tissue\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic methods (linkage, mutation screening, somatic second-hit), replicated across many families, foundational discovery paper\",\n      \"pmids\": [\"11845407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"FAP48 (GLMN short isoform) was identified as a protein that specifically interacts with immunophilins FKBP59 and FKBP12. The interaction occurs via the drug-binding domain of the FKBPs and is prevented by FK506 and rapamycin in a dose-dependent manner, suggesting FAP48 shares or overlaps the macrolide binding site on these immunophilins.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding assay, in vivo co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro and in vivo binding confirmation, single lab, two orthogonal methods\",\n      \"pmids\": [\"8955134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FAP68 (the full-length GLMN isoform, 68 kDa) was identified as a ligand-regulated binding partner of the hepatocyte growth factor receptor (Met/c-Met). FAP68 binds specifically to the inactive (unphosphorylated) form of Met via its last 30 C-terminal amino acids, is released upon HGF stimulation and receptor phosphorylation, and free FAP68 specifically stimulates p70 S6 kinase (p70S6K) activity. Non-phosphorylated Met prevents FAP68 from stimulating p70S6K.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation of endogenous proteins, in vitro binding, kinase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with endogenous proteins, yeast two-hybrid, functional kinase assay; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"11571281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p185 (CUL7) forms an SCF-like multiprotein complex with Skp1, Rbx1, Fbw6 (Fbx29), and FAP68/FAP48 (glomulin/GLMN). Targeted disruption of Cul7 in mice results in abnormal vascular morphogenesis and placental defects, linking the complex to vascular development.\",\n      \"method\": \"Co-immunoprecipitation (complex purification), targeted gene disruption (knockout mouse), histopathology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP establishing complex membership, in vivo knockout phenotype; single lab but multiple methods\",\n      \"pmids\": [\"12904573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Overexpression of FAP48 (GLMN) in Jurkat T cells inhibits cellular proliferation (similar to FK506 exposure) and increases IL-2 production. FAP48 overexpression modifies expression of argininosuccinate synthetase and the Myc antagonist Mxi1, suggesting these as mediators of the antiproliferative effect. FAP48 does not affect calcineurin/NFAT1 or JNK/p38 pathways.\",\n      \"method\": \"Doxycycline-inducible overexpression in Jurkat T cells, proliferation assay, cytokine measurement, gene expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean inducible overexpression system with multiple functional readouts; single lab\",\n      \"pmids\": [\"12604780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Glomulin (GLMN) binds directly to the RING domain of Rbx1 and inhibits CRL1 (SCF) E3 ubiquitin ligase activity. Loss of GLMN results in decreased levels of Fbw7 and increased levels of Cyclin E and c-Myc due to enhanced CRL1(Fbw7)-mediated Fbw7 turnover. GLMN thus modulates the autoubiquitination and stability of the substrate receptor Fbw7.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, protein level analysis in cells/tissues/GVM lesions, proteasome inhibitor experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding demonstrated, in vitro ubiquitination assay, loss-of-function in multiple cell/tissue contexts, mechanistic pathway validated by proteasome inhibitor rescue; multiple orthogonal methods\",\n      \"pmids\": [\"22405651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of a GLMN–RBX1–CUL1 complex was solved. GLMN adopts a HEAT-like repeat fold and tightly binds the E2-interacting surface of RBX1, thereby inhibiting CRL-mediated ubiquitin chain formation by the E2 CDC34. The structure explains GLMN's selectivity for RBX1 over RBX2, and demonstrates how disease-associated GVM mutations disrupt GLMN–RBX1 interactions.\",\n      \"method\": \"X-ray crystallography, in vitro ubiquitination chain formation assay, mutagenesis of disease-associated residues, small-angle X-ray scattering (SAXS)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with biochemical validation (in vitro assay + mutagenesis) in a single rigorous study; mechanistically definitive\",\n      \"pmids\": [\"22748924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Somatic uniparental isodisomy (aUPID) of chromosome 1p, rendering the inherited glomulin mutation homozygous in affected tissue, is the predominant second-hit mechanism in glomuvenous malformation lesions (identified in 16 somatic events). This demonstrates that complete biallelic loss of GLMN function is required to trigger GVM formation.\",\n      \"method\": \"Allele-specific pairwise SNP-chip analysis, direct sequencing of lesional DNA vs. blood DNA\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic analysis of multiple lesions with sensitive pairwise SNP-chip method, multiple independent cases confirming the mechanism\",\n      \"pmids\": [\"23375657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GLMN (glomulin) is a substrate target of the Shigella E3 ubiquitin ligase effector IpaH7.8. IpaH7.8 ubiquitinates GLMN and promotes its degradation, which activates NLRP3 and NLRC4 inflammasomes and caspase-1, leading to macrophage pyroptosis. GLMN overexpression reduced inflammasome activation, while GLMN knockdown or haploinsufficiency (GLMN+/- mice) enhanced it. GLMN puncta colocalize with active caspase-1 upon LPS/ATP stimulation.\",\n      \"method\": \"Bacterial infection assays with IpaH7.8 mutants, overexpression and siRNA knockdown of GLMN, GLMN+/- mouse macrophages, caspase-1 activation assay, co-localization by fluorescence microscopy, in vivo infection model\",\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 methods (genetic, pharmacological, imaging, in vivo mouse model), gain- and loss-of-function both tested, E3 ligase-null mutant control\",\n      \"pmids\": [\"25246571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GLMN specifically binds the RING domains of cellular inhibitor of apoptosis proteins cIAP1 and cIAP2, inhibiting their self-ubiquitination (auto-ubiquitination) E3 ligase activity. Loss of GLMN (via IpaH7.8-mediated degradation or siRNA knockdown) enhances cIAP-mediated inflammasome activation in response to multiple stimuli (Shigella, Salmonella, Pseudomonas infection; NLRP3 activators SiO2, alum, MSU; AIM2 activator poly dA:dT), establishing GLMN as a negative regulator of cIAP-driven inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation (GLMN with cIAP1/2 RING domains), in vitro self-ubiquitination assay, siRNA knockdown, bacterial infection assays with multiple pathogens, inflammasome activation assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding demonstrated by co-IP, in vitro E3 activity assay, multiple loss-of-function approaches, broad stimulus panel; single lab but multiple orthogonal methods and robust controls\",\n      \"pmids\": [\"29191979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mutation of proline 219 to alanine in FAP48 (GLMN) abolishes its interaction with FKBP12 and FKBP52, identifying a cysteinyl-prolyl motif at proline 219 as essential for FKBP binding.\",\n      \"method\": \"Yeast two-hybrid with sequential point mutagenesis of proline residues\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — site-directed mutagenesis with functional interaction readout; single lab, single method\",\n      \"pmids\": [\"11164950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FKBP51 and FKBP12.6 were identified as novel, tight binding partners of glomulin (GLMN) in vitro; the previously reported FKBP12 interaction was found to be comparatively weak. Two amino acids lining the FK506-binding site of FKBP51 are essential for glomulin binding, and FKBP ligands block the FKBP51–GLMN interaction.\",\n      \"method\": \"In vitro binding analysis, binding affinity measurements of full-length and truncated FKBP mutants, mutagenesis of FK506-binding site residues\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding assays with mutagenesis; single lab, multiple FKBP variants tested\",\n      \"pmids\": [\"31490997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GLMN knockdown in melanocytic MNT-1 cells increased melanin concentration, increased proportion of mature (stage III/IV) melanosomes, and upregulated microphthalmia-associated transcription factor (MITF) and tyrosinase while downregulating phosphorylated p70S6K, implicating GLMN in the regulation of melanogenesis via the p70S6K pathway.\",\n      \"method\": \"siRNA knockdown in human MNT-1 melanocytic cells, melanin quantification, immunofluorescence, transmission electron microscopy, Western blotting\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple cellular readouts and pathway marker analysis; single lab\",\n      \"pmids\": [\"38489583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Glucocorticoid receptor NR3C1 represses GLMN transcription under stress conditions; reduced GLMN prevents FKBP12.6 ubiquitination and degradation, leading to calcium leakage and overload, which impairs mitochondrial quality control and damages cardiomyocytes. ChIP-qPCR and siRNA knockdown confirmed that NR3C1 is an upstream repressor of GLMN, and that GLMN mediates FKBP12.6 ubiquitination.\",\n      \"method\": \"Mouse restraint stress models (acute and chronic), ChIP-qPCR, siRNA knockdown of NR3C1 and GLMN, Western blotting, transmission electron microscopy, cardiac functional assessment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR for direct promoter occupancy, siRNA loss-of-function, in vivo mouse model; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"40943170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FAP48 (GLMN) overexpression in adipocytes alters adipogenesis by acting on both calcineurin and glucocorticoid pathways, and modulates the capacity of certain HIV drugs (Saquinavir and Efavirenz, but not Stavudine, Amprenavir, or Indinavir) to inhibit adipocyte formation.\",\n      \"method\": \"Stable overexpression in cell line, adipogenesis assay, drug treatment experiments\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single overexpression study with functional readout but limited mechanistic resolution; single lab, single method type\",\n      \"pmids\": [\"22678819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GLMN variants (p.Pro254Arg and p.Glu544*) identified in Blue Rubber Bleb Nevus Syndrome patients increased phosphorylation of mTOR at Ser-2448 when expressed in HUVECs compared to wild-type GLMN, suggesting that loss-of-function GLMN variants activate mTOR signaling.\",\n      \"method\": \"Overexpression of variant constructs in HUVECs, immunoblotting for phospho-mTOR\",\n      \"journal\": \"Combinatorial chemistry & high throughput screening\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — overexpression assay with single pathway readout; single lab, single method\",\n      \"pmids\": [\"31793416\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Glomulin (GLMN) is a HEAT-repeat scaffold protein that functions as a selective inhibitor of RBX1-containing Cullin-RING ligases (CRLs): its crystal structure reveals that it masks the E2-binding surface of RBX1, blocking CDC34-mediated ubiquitin chain formation and thereby stabilizing CRL1 substrates including Fbw7; it also binds the RING domains of cIAP1/2 to suppress inflammasome activation, interacts with FKBPs (especially FKBP51/12.6) in an FK506-sensitive manner, and associates with the inactive HGF receptor (Met) to modulate p70S6K signaling, with complete biallelic loss of GLMN—through inherited plus somatic second-hit mutations—causing glomuvenous malformations by disrupting vascular smooth muscle cell differentiation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Glomulin (GLMN) is a HEAT-repeat scaffold protein that acts as a selective inhibitor of RING-domain E3 ubiquitin ligases and, through this activity, governs vascular smooth muscle cell differentiation, inflammasome control, and several signaling outputs [#5, #6, #9]. Its best-defined role is as a direct binder of the RING protein RBX1 within Cullin-RING ligase 1 (CRL1/SCF): the GLMN-RBX1-CUL1 crystal structure shows GLMN masking the E2-interacting surface of RBX1, thereby blocking CDC34-mediated ubiquitin chain formation and selectively inhibiting CRL1 over RBX2-containing ligases [#6]. By restraining CRL1, GLMN limits autoubiquitination and turnover of the substrate receptor Fbw7, so that GLMN loss lowers Fbw7 and elevates Cyclin E and c-Myc [#5]. GLMN extends this inhibitory logic to other RING ligases, binding the RING domains of cIAP1/cIAP2 to suppress their self-ubiquitination and thereby acting as a negative regulator of cIAP-driven NLRP3/NLRC4/AIM2 inflammasome activation; the Shigella effector IpaH7.8 ubiquitinates and degrades GLMN to unleash inflammasome activation and pyroptosis [#8, #9]. GLMN also interacts with the immunophilins FKBP51/FKBP12.6 (and more weakly FKBP12) through their FK506-binding pocket, an interaction blocked by FKBP ligands [#1, #11], and associates with the inactive HGF receptor Met to modulate p70S6K signaling [#2]. Complete biallelic loss of GLMN — an inherited truncating mutation plus a somatic second hit, predominantly through uniparental isodisomy of 1p — causes glomuvenous malformations by disrupting vascular smooth-muscle-like glomus cell differentiation [#0, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established GLMN as a disease gene by showing that loss-of-function mutations cause glomuvenous malformations, linking the protein to vascular smooth muscle differentiation before any molecular function was known.\",\n      \"evidence\": \"Positional cloning, mutation screening, and identification of a somatic second-hit in lesional tissue across many families\",\n      \"pmids\": [\"11845407\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular mechanism for how GLMN loss disrupts VSMC differentiation\", \"Biochemical activity of the protein unknown at this stage\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"First identified a GLMN binding partner, showing the short isoform engages FKBP immunophilins at their drug-binding site, hinting at a link to immunosuppressant-sensitive pathways.\",\n      \"evidence\": \"Yeast two-hybrid plus in vitro and in vivo co-immunoprecipitation with FKBP59/FKBP12\",\n      \"pmids\": [\"8955134\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of FKBP binding not defined\", \"Did not distinguish which FKBPs bind most tightly\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Connected GLMN to receptor tyrosine kinase signaling by showing it binds inactive Met and, upon release, stimulates p70S6K, providing a candidate signaling output.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal endogenous co-IP, in vitro binding, and kinase activity assay\",\n      \"pmids\": [\"11571281\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism of p70S6K stimulation by free GLMN unresolved\", \"Physiological relevance to vascular disease not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapped the FKBP interaction to a defined residue, refining the molecular basis of immunophilin binding.\",\n      \"evidence\": \"Yeast two-hybrid with proline point mutagenesis (P219A) abolishing FKBP12/FKBP52 binding\",\n      \"pmids\": [\"11164950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single interaction readout without structural validation\", \"Functional role of the FKBP-GLMN complex still unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Placed GLMN within an SCF-like ubiquitin ligase complex and tied that complex to vascular morphogenesis, an early clue that GLMN operates in the ubiquitin system.\",\n      \"evidence\": \"Co-IP complex purification with CUL7/Skp1/Rbx1/Fbw6 and Cul7-knockout mouse phenotyping\",\n      \"pmids\": [\"12904573\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GLMN regulates or is merely a passenger of the complex not determined\", \"No biochemical role for GLMN in ligase activity yet\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed cellular consequences of GLMN overexpression on proliferation and IL-2, with candidate downstream effectors, while excluding calcineurin/NFAT and stress kinase pathways.\",\n      \"evidence\": \"Doxycycline-inducible overexpression in Jurkat T cells with proliferation, cytokine, and gene-expression readouts\",\n      \"pmids\": [\"12604780\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting GLMN to ASS/Mxi1 expression unknown\", \"Overexpression context may not reflect endogenous function\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined GLMN's core biochemical function: direct RBX1 binding that inhibits CRL1 activity and stabilizes the substrate receptor Fbw7, explaining downstream Cyclin E and c-Myc control.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination assays, loss-of-function protein-level analysis, and proteasome-inhibitor rescue\",\n      \"pmids\": [\"22405651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of CRL1 substrates regulated through GLMN not enumerated\", \"How GLMN abundance is controlled in vivo unaddressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the structural mechanism, showing GLMN's HEAT-repeat fold masks the E2-binding surface of RBX1 to block CDC34, explaining both its CRL selectivity and how GVM mutations break the interaction.\",\n      \"evidence\": \"X-ray crystallography of GLMN-RBX1-CUL1 with in vitro chain-formation assays, disease-residue mutagenesis, and SAXS\",\n      \"pmids\": [\"22748924\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address GLMN's RING-binding outside the CRL context\", \"Cellular regulation of GLMN-RBX1 association not captured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that complete biallelic GLMN loss is required for GVM, identifying somatic uniparental isodisomy of 1p as the predominant second-hit mechanism.\",\n      \"evidence\": \"Allele-specific SNP-chip analysis and direct sequencing of lesional versus blood DNA across multiple lesions\",\n      \"pmids\": [\"23375657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell type in which GLMN loss initiates the lesion not pinpointed\", \"Link from CRL1 dysregulation to glomus cell phenotype not mechanistically traced\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed GLMN as a target of pathogen subversion, with Shigella IpaH7.8 degrading GLMN to activate inflammasomes and pyroptosis, establishing GLMN as a brake on innate immune activation.\",\n      \"evidence\": \"Bacterial infection with IpaH7.8 mutants, GLMN gain/loss-of-function, GLMN+/- mouse macrophages, caspase-1 and colocalization assays, and an in vivo model\",\n      \"pmids\": [\"25246571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target of GLMN in inflammasome control not yet identified in this study\", \"Whether the same axis operates in vascular tissue unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the molecular target of GLMN's inflammasome control, showing it binds cIAP1/2 RING domains to inhibit their autoubiquitination, generalizing GLMN's RING-ligase inhibitory mode beyond RBX1.\",\n      \"evidence\": \"Co-IP of GLMN with cIAP RING domains, in vitro self-ubiquitination assays, siRNA, and broad pathogen/agonist inflammasome panel\",\n      \"pmids\": [\"29191979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GLMN selects among RING E3s in vivo not resolved\", \"Quantitative balance between CRL1 and cIAP regulation by endogenous GLMN unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Refined the GLMN-immunophilin interaction map, establishing FKBP51 and FKBP12.6 as the tight partners and localizing the contact to the FK506-binding pocket.\",\n      \"evidence\": \"In vitro binding and affinity measurements with full-length and truncated FKBP variants and FK506-pocket mutagenesis\",\n      \"pmids\": [\"31490997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular function of the FKBP51/12.6-GLMN complex not defined\", \"No structure of the GLMN-FKBP complex\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended GLMN's p70S6K-linked function to melanogenesis, showing GLMN knockdown raises melanin, mature melanosomes, MITF and tyrosinase while lowering phospho-p70S6K.\",\n      \"evidence\": \"siRNA knockdown in MNT-1 melanocytic cells with melanin quantification, imaging, EM, and pathway immunoblotting\",\n      \"pmids\": [\"38489583\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between GLMN and p70S6K phosphorylation in melanocytes unproven\", \"Whether ubiquitin-ligase inhibition underlies this phenotype not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Positioned GLMN within a stress-responsive transcriptional and calcium-handling axis, showing glucocorticoid receptor NR3C1 represses GLMN and that GLMN mediates FKBP12.6 ubiquitination affecting cardiomyocyte calcium homeostasis.\",\n      \"evidence\": \"Mouse restraint stress models, ChIP-qPCR, NR3C1/GLMN siRNA, immunoblotting, EM, and cardiac functional assessment\",\n      \"pmids\": [\"40943170\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which E3 ligase GLMN engages to drive FKBP12.6 ubiquitination not identified\", \"Direct versus indirect role of GLMN in calcium leak unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GLMN's distinct molecular activities — CRL1 inhibition, cIAP inhibition, FKBP binding, and Met/p70S6K modulation — are integrated to produce the tissue-specific vascular smooth muscle phenotype of glomuvenous malformation remains unresolved.\",\n      \"evidence\": \"No single study connects the biochemical inhibitor functions to the differentiation defect in glomus cells\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No causal chain from CRL1/Fbw7 dysregulation to VSMC differentiation failure\", \"Relative contribution of each GLMN interaction to disease unknown\", \"No in vivo conditional models dissecting individual GLMN activities\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 6, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [\"CRL1/SCF (RBX1-CUL1)\", \"CUL7 SCF-like complex\"],\n    \"partners\": [\"RBX1\", \"CUL1\", \"FBXW7\", \"BIRC2\", \"BIRC3\", \"FKBP5\", \"FKBP1B\", \"MET\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}