{"gene":"LAMTOR1","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2014,"finding":"LAMTOR1/p18 is a membrane protein specifically localized to the surface of late endosomes/lysosomes via N-terminal myristoylation and palmitoylation, where it serves as the anchor for the Ragulator complex (containing p14/LAMTOR2, MP1/LAMTOR3, HBXIP, and C7orf59). The Ragulator interacts with RagAB/CD GTPases and V-ATPase to activate mTORC1 on the lysosomal surface. The Ragulator also regulates a branch of the MAPK pathway by recruiting MEK1 to MP1/LAMTOR3.","method":"Biochemical fractionation, co-immunoprecipitation, membrane localization assays, review of prior experimental work","journal":"Methods in enzymology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, replicated across multiple labs, convergent findings from multiple studies establishing complex membership and lysosomal anchor function","pmids":["24377928"],"is_preprint":false},{"year":2010,"finding":"LAMTOR1 (Pdro/C11orf59) is localized to late endosomes/lysosomes through N-terminal myristoylation and palmitoylation. Depletion of LAMTOR1 by siRNA increases cellular free cholesterol content, accompanied by increased cholesterol efflux, stimulated LDL uptake, and increased cholesterol egress from late endosomes/lysosomes, indicating a role in cholesterol homeostasis.","method":"siRNA knockdown, stable overexpression, cholesterol measurement assays, subcellular fractionation, proteomic analysis of detergent-resistant membranes","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods (KD, OE, cholesterol assays, fractionation) establishing localization and functional role in cholesterol trafficking","pmids":["20544018"],"is_preprint":false},{"year":2010,"finding":"LAMTOR1 (p27RF-Rho) promotes cancer metastasis by activating RhoA and RhoC, freeing RhoA from inhibition by cytoplasmic p27kip1. Knockdown of p27RF-Rho in metastatic melanoma cells markedly decreased lung metastasis, and p27RF-Rho regulated cellular adhesion, motility, and pericellular proteolysis through Rho activity.","method":"shRNA knockdown, in vivo mouse tail-vein metastasis assay, cell adhesion and motility assays, Rho activation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, in vivo loss-of-function with defined metastatic phenotype and Rho activation readouts","pmids":["21087931"],"is_preprint":false},{"year":2012,"finding":"LAMTOR1 depletion alters lysosomal activation: lysosomes become scattered in positioning but remain functional for cathepsin B maturation. LAMTOR1 loss stimulates autophagic flux, leading to excessive reactive oxygen species (ROS) production, which triggers p53-dependent cell cycle arrest and apoptosis. This lysosomal cell death pathway does not require mTORC1 activity.","method":"siRNA knockdown, immunofluorescence, ROS measurement, apoptosis assays, autophagic flux assays, p53 pathway analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods establishing mechanistic pathway from lysosomal dysregulation to p53-dependent death","pmids":["22513874"],"is_preprint":false},{"year":2013,"finding":"Conditional ablation of p18/LAMTOR1 in mouse epidermis attenuated lysosome function, resulting in accumulation of immature lysosomes and autophagosomes, and defective functional interaction between lysosomes and autophagosomes. This caused failure of corneocyte maturation and loss of skin barrier function, demonstrating that p18-mediated pathways control lysosome-mediated catabolic processes required for epidermal development.","method":"Conditional knockout mouse (Cre-lox), electron microscopy, cell culture lysosome behavior assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with defined cellular phenotype, electron microscopy ultrastructural analysis, and cell culture mechanistic follow-up","pmids":["23781028"],"is_preprint":false},{"year":2016,"finding":"Lamtor1 forms an amino-acid sensing complex with lysosomal v-ATPase and serves as the scaffold for amino acid-activated mTORC1. Lamtor1 is critically required for M2 macrophage polarization; its deficiency, amino-acid starvation, or inhibition of v-ATPase and mTOR result in defective M2 and enhanced M1 polarization. Liver X receptor (LXR) and production of 25-hydroxycholesterol are identified as downstream targets of Lamtor1 and mTORC1 in this pathway.","method":"Conditional knockout mouse (myeloid-specific), macrophage polarization assays, pharmacological inhibition of v-ATPase and mTOR, 25-hydroxycholesterol measurements, LXR pathway analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO, multiple orthogonal pharmacological and genetic approaches, identification of downstream effectors","pmids":["27731330"],"is_preprint":false},{"year":2017,"finding":"Lamtor1-deficient CD4+ T cells exhibit marked reductions in proliferation, IL-2 production, mTORC1 activity, and purine/lipid-synthesis gene expression. Th17 polarization, but not Th1/Th2, is diminished. Lamtor1-deficient regulatory T cells lose suppressive function and CTLA-4 expression, resulting in severe autoimmunity, indicating that Lamtor1 is essential for mTORC1-dependent T cell function.","method":"T cell-specific and Foxp3-specific conditional knockout mice, T cell polarization assays, proliferation assays, mTORC1 activity measurement, experimental autoimmune encephalomyelitis model","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional KO mouse strains, multiple orthogonal cellular readouts, in vivo disease model","pmids":["28768723"],"is_preprint":false},{"year":2018,"finding":"UBE3A ubiquitinates p18/LAMTOR1, resulting in its proteasomal degradation. UBE3A deficiency (as in Angelman syndrome) leads to increased lysosomal localization of p18 and other Ragulator-Rag complex members and increased mTORC1 activity in hippocampal neurons. p18 knockdown in CA1 neurons of AS mice reduces elevated mTORC1 activity and improves dendritic spine maturation, LTP, and learning.","method":"Co-immunoprecipitation, ubiquitination assays, in vivo knockdown in AS mouse model, mTORC1 activity assays, electrophysiology (LTP), behavioral tests","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including biochemical ubiquitination assays, in vivo rescue experiments, and functional readouts in a disease model","pmids":["30020076"],"is_preprint":false},{"year":2018,"finding":"Lamtor1 controls innate immune responses by regulating mTORC1-dependent phosphorylation and nuclear translocation of TFEB (master regulator of lysosome/autophagosome biogenesis). Myeloid-specific Lamtor1 KO mice show nuclear TFEB translocation in alveolar macrophages and hypersensitivity to LPS and bleomycin.","method":"Myeloid-specific conditional knockout mouse, TFEB localization assays, LPS and bleomycin challenge models, immunofluorescence","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO, mechanistic pathway placement (Lamtor1→mTORC1→TFEB phosphorylation), in vivo disease model","pmids":["29686050"],"is_preprint":false},{"year":2019,"finding":"LAMTOR1 is directly palmitoylated (covalent lipid modification), and this palmitoylation is rapidly increased prior to mTORC1 activation by amino acids. Acute pharmacological inhibition of palmitoylation prevents amino acid-dependent mTORC1 activation in HEK293T cells and BDNF-dependent mTORC1 activation in hippocampal neurons, indicating that dynamic palmitoylation of LAMTOR1 is actively involved in mTORC1 signaling rather than merely permissive.","method":"Palmitoyl-proteomics, acyl-RAC assay (direct palmitoylation detection), pharmacological inhibition of palmitoylation, mTORC1 activity assays in HEK293T cells and primary hippocampal neurons","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, direct palmitoylation detection assay plus functional rescue, two cell types tested","pmids":["31001086"],"is_preprint":false},{"year":2019,"finding":"The LAMTOR2/LAMTOR1 complex regulates xenophagy against Group A Streptococcus and Salmonella. LAMTOR1 localizes to bacterium-containing endosomes; LAMTOR2 is recruited to damaged endosomes in a LAMTOR1-dependent manner. LAMTOR2 interacts with autophagy receptors NBR1, TAX1BP1, and p62, and is required for TAX1BP1 recruitment to pathogen-containing autophagosomes and autolysosome formation.","method":"Fluorescence microscopy, co-immunoprecipitation, LAMTOR1/2 knockout cells, bacterial infection assays, autolysosome formation assays","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, KO cells with defined phenotype, Co-IP for interaction, multiple bacterial pathogens tested","pmids":["30428163"],"is_preprint":false},{"year":2019,"finding":"Loss of LAMTOR1 in pancreatic β-cells increases glucose-stimulated insulin secretion. LAMTOR1 KO leads to mitochondrial dysfunction but increases glutamate content in insulin granules and increases ACC1 (acetyl-CoA carboxylase 1) activity, thereby enhancing the amplification pathway of insulin secretion.","method":"β-cell-specific conditional knockout mouse, hyperglycemic clamp, islet perfusion, mitochondrial functional analysis, glutamate and ACC1 activity measurements","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, in vivo conditional KO with multiple metabolic readouts and mechanistic measurements","pmids":["31939616"],"is_preprint":false},{"year":2015,"finding":"Depletion of p18/LAMTOR1 promotes cell survival under starvation by stimulating autophagy through modulation of p27kip1 activity. In p18-deficient MEF cells, phosphorylation of p27kip1 at Thr198 is elevated and LC3-II formation and other autophagy markers are increased. Suppression of p27kip1 in p18-deficient cells mitigates starvation-induced survival advantage.","method":"p18 knockout MEF cells, cell death assays, caspase-3 cleavage, LC3-II immunoblot, p27kip1 phosphorylation analysis, siRNA knockdown of p27kip1","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, genetic KO cells with multiple biochemical readouts, epistasis via p27kip1 knockdown","pmids":["26032166"],"is_preprint":false},{"year":2022,"finding":"USP32 deubiquitinates LAMTOR1; USP32 knockout results in hyperubiquitination of LAMTOR1, which impairs its interaction with the vacuolar H+-ATPase, reduces Ragulator function, limits mTORC1 lysosomal recruitment, decreases mTORC1 activity, and induces autophagy.","method":"USP32 knockout (hTERT-RPE1 cells), ubiquitination assays, Co-immunoprecipitation (LAMTOR1–v-ATPase interaction), mTOR lysosomal localization by microscopy, mTORC1 activity assays, autophagy assays; C. elegans CYK-3 KD as ortholog validation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO in human cells, multiple orthogonal methods (ubiquitination, Co-IP, localization, activity), cross-species validation in C. elegans","pmids":["36476874"],"is_preprint":false},{"year":2022,"finding":"LAMTOR1 directly interacts with TRPML1 through its N-terminal domain, tonically inhibiting TRPML1-mediated lysosomal Ca2+ release independently of mTORC1. LAMTOR1 deletion or disruption of LAMTOR1–TRPML1 binding increases Ca2+ release, facilitates dynein-powered lysosomal trafficking in dendrites, alters synaptic plasticity via calcineurin-mediated GluA1 dephosphorylation, and impairs learning and memory.","method":"Co-immunoprecipitation, LAMTOR1 deletion (hippocampal CA1 in vivo), Ca2+ imaging, TAT-decoy peptide disruption of interaction, lysosomal trafficking assays, LTP electrophysiology, behavioral tests (object recognition, fear conditioning)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct interaction identified by Co-IP, multiple orthogonal functional assays including in vivo deletion, peptide disruption, Ca2+ imaging, electrophysiology, and behavior","pmids":["35099830"],"is_preprint":false},{"year":2022,"finding":"NMT1 myristoylates LAMTOR1 at Gly2, resulting in increased LAMTOR1 protein stability and lysosomal localization. NMT1 deficiency blocks LAMTOR1 myristoylation and inhibits mTORC1-dependent bladder cancer progression.","method":"NMT1 knockdown/knockout, myristoylation site mutagenesis (Gly2), subcellular fractionation, LAMTOR1 stability assays, in vitro and in vivo cancer progression assays, NMT1 inhibitor (B13)","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, site-directed mutagenesis establishing specific modification site, multiple in vitro and in vivo functional readouts","pmids":["34999170"],"is_preprint":false},{"year":2024,"finding":"TRAF4 directly interacts with LAMTOR1 and catalyzes K63-linked polyubiquitination of LAMTOR1 at K151 in an amino acid-dependent manner. This ubiquitination promotes LAMTOR1 binding to Rag GTPases and enhances mTORC1 activation. K151R knock-in or TRAF4 knockout blocks amino acid-induced mTORC1 activation.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, K151R knock-in cells, TRAF4 knockout, mTORC1 activity assays, K63-linkage-specific ubiquitin analysis, in vivo colon cancer model","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitination assay establishing direct E3-substrate relationship, site-specific mutagenesis (K151R), multiple orthogonal methods, in vivo validation","pmids":["38229144"],"is_preprint":false},{"year":2024,"finding":"LAMTOR1 interacts with HRS and facilitates PD-L1 lysosomal degradation, thereby reducing exosomal PD-L1 release. This function depends on a specific ubiquitination site and an HRS binding sequence on LAMTOR1.","method":"Co-immunoprecipitation (LAMTOR1–HRS interaction), PD-L1 lysosomal degradation assays, exosome quantification, LAMTOR1 domain/mutant analysis","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, Co-IP establishing interaction, mutational dissection of functional domains, mechanistic pathway placement","pmids":["39223601"],"is_preprint":false},{"year":2024,"finding":"LAMTOR1 interacts with and promotes accumulation of cGAS in lysosomes upon chemotherapy-induced DNA fragment exposure, leading to cGAS degradation via the receptor protein p62. LAMTOR1 deficiency increases cGAS abundance and promotes cGAS-STING pathway activation and type I interferon production.","method":"Co-immunoprecipitation (LAMTOR1–cGAS interaction), LAMTOR1 knockout, cGAS abundance and stability assays, STING pathway activation measurement, interferon production assays, in vivo tumor models","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, Co-IP establishing direct interaction, KO with defined molecular and in vivo phenotype, pathway placement","pmids":["39361643"],"is_preprint":false},{"year":2020,"finding":"p18/Lamtor1-mediated mTORC1 signaling on lysosomes is required for goblet cell differentiation in the intestinal epithelium. Conditional p18 KO in colonic crypts delocalizes mTORC1 from lysosomes, markedly decreases mTORC1 activity, increases proliferating cells, and dramatically reduces mucin-producing goblet cells. Rapamycin phenocopies goblet cell loss, confirming mTORC1 dependence.","method":"Intestinal epithelium-specific conditional knockout mouse, mTORC1 localization assays (lysosome fractionation/immunofluorescence), histology, colon crypt organoid culture, rapamycin treatment","journal":"Cell structure and function","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with defined cellular phenotype, mTORC1 delocalization measured, pharmacological phenocopy with rapamycin, organoid culture validation","pmids":["32641600"],"is_preprint":false},{"year":2021,"finding":"Platelet-derived microvesicles (PMVs) promote VSMC dedifferentiation via Src-dependent induction of Lamtor1, which activates mTORC1 signaling. Knockdown of Lamtor1 attenuates PMV-induced dedifferentiation, and SMC-specific Lamtor1 KO markedly attenuates intimal hyperplasia after vascular injury in vivo.","method":"siRNA knockdown, SMC-specific conditional knockout mouse, mTORC1 activity assays (S6K and 4E-BP1 phosphorylation), Src inhibitor experiments, in vivo intimal injury model","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, conditional KO in vivo, siRNA loss-of-function, pharmacological epistasis with Src inhibitor","pmids":["34604241"],"is_preprint":false},{"year":2025,"finding":"Binding of the natural compound acacetin (ACA) to LAMTOR1 induces LAMTOR1 release from the Ragulator complex, leading to mTORC1 inhibition and autophagy induction. Genetic knockdown of LAMTOR1 phenocopies ACA treatment, and this process modulates the mTORC1-AMPK axis to ameliorate lipid accumulation in MAFLD.","method":"DARTS (drug affinity responsive target stability) combined with LC-MS/MS proteomics identifying LAMTOR1 as ACA target, LAMTOR1 KD phenocopy, CETSA, mTORC1 and AMPK activity assays, autophagy flux assays, in vivo CDAHFD mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, DARTS/CETSA establishing direct drug-protein interaction, genetic KD phenocopy, in vivo model","pmids":["40548398"],"is_preprint":false},{"year":2024,"finding":"LAMTOR1 regulates lysosomal positioning in hippocampal neuronal dendrites through TRPML1 inhibition. LAMTOR1 knockdown increases lysosomal accumulation in proximal dendrites, reversible by TRPML1 KD, inhibition, or dynein inhibitor ciliobrevin D, indicating dynein-mediated transport downstream of TRPML1 activation.","method":"LAMTOR1 knockdown, TRPML1 knockdown, pharmacological TRPML1 activation (ML-SA1), TAT-decoy peptide disrupting LAMTOR1-TRPML1 binding, dynein inhibitor (ciliobrevin D), live imaging of lysosomal distribution in cultured hippocampal neurons","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab (same group as PMID:35099830), multiple genetic/pharmacological tools, consistent with prior EMBO J findings","pmids":["39650798"],"is_preprint":false},{"year":2026,"finding":"ZDHHC9 specifically palmitoylates LAMTOR1 at Cys3/Cys4 residues, enhancing mTORC1 recruitment to lysosomes and activating mTOR signaling in renal cell carcinoma.","method":"Palmitoylation assays, site-directed mutagenesis (Cys3/4), ZDHHC9 KO/KD, mTORC1 activity assays, co-immunoprecipitation","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — single lab, site-specific mutagenesis identifying palmitoylation sites, functional mTORC1 recruitment assays","pmids":["41856969"],"is_preprint":false},{"year":2024,"finding":"Oxidative stress reduces LAMTOR1 protein predominantly through lysosomal degradation (reversible by lysosomal inhibitors pepstatin A and NH4Cl). Nrf2 positively regulates LAMTOR1 transcription through histone acetyltransferase p300-mediated histone acetylation. LAMTOR1 overexpression reverses 4-HNE-induced TFEB nuclear translocation, placing LAMTOR1 upstream of TFEB in this stress-response pathway.","method":"Pharmacological lysosomal inhibition (pepstatin A, NH4Cl), Nrf2 overexpression, luciferase reporter assay with lamtor1 promoter deletion mutants, p300 inhibitor, acetylated histone 3 immunoblot, TFEB localization assays, in vivo NaIO3 mouse model","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods establishing lysosomal degradation mechanism, promoter analysis, and epistasis with TFEB","pmids":["39424220"],"is_preprint":false}],"current_model":"LAMTOR1 is a myristoylated and palmitoylated lysosomal membrane anchor protein that scaffolds the pentameric Ragulator complex (with LAMTOR2/3/4/5) on late endosome/lysosome surfaces, where it integrates amino acid signals via v-ATPase interaction to activate mTORC1 and regulate MAPK signaling; it is subject to dynamic post-translational regulation including K63-linked ubiquitination by TRAF4 (promoting Rag GTPase binding), de-ubiquitination by USP32, proteasomal degradation triggered by UBE3A-mediated ubiquitination, and palmitoylation by ZDHHC9 (promoting mTORC1 recruitment), while also directly inhibiting the lysosomal Ca2+ channel TRPML1 through its N-terminal domain to control dendritic lysosomal trafficking, synaptic plasticity, and learning; collectively, LAMTOR1 controls mTORC1-dependent processes including macrophage M2 polarization, T cell function, autophagy, goblet cell differentiation, and cholesterol homeostasis."},"narrative":{"mechanistic_narrative":"LAMTOR1 is a lysosomal membrane anchor that scaffolds the pentameric Ragulator complex on the surface of late endosomes/lysosomes, where it integrates amino acid signals through interaction with the v-ATPase to recruit and activate mTORC1, while also routing a branch of MAPK signaling [PMID:24377928]. Its lysosomal positioning and stability depend on N-terminal lipid modifications: NMT1 myristoylates Gly2 to stabilize the protein and direct it to lysosomes [PMID:34999170], and palmitoylation—including ZDHHC9-mediated modification at Cys3/Cys4—is rapidly induced ahead of amino-acid-driven mTORC1 activation and is required for mTORC1 recruitment [PMID:31001086, PMID:41856969]. LAMTOR1 function is further tuned by ubiquitination: TRAF4 catalyzes amino-acid-dependent K63-linked polyubiquitination at K151 to promote Rag GTPase binding and mTORC1 activation [PMID:38229144], USP32 deubiquitinates LAMTOR1 to preserve its v-ATPase interaction and Ragulator activity [PMID:36476874], and UBE3A-mediated ubiquitination targets it for proteasomal degradation [PMID:30020076]. Through this mTORC1 hub, LAMTOR1 governs autophagy and the lysosomal biogenesis program via TFEB [PMID:29686050, PMID:39424220], and controls diverse cell-fate and physiological outputs including macrophage M2 polarization [PMID:27731330], T cell function and immune tolerance [PMID:28768723], intestinal goblet cell differentiation [PMID:32641600], and epidermal lysosome-dependent catabolism required for skin barrier formation [PMID:23781028]. Independently of mTORC1, LAMTOR1 directly binds and tonically inhibits the lysosomal Ca2+ channel TRPML1 through its N-terminal domain, thereby controlling dynein-driven dendritic lysosome trafficking, synaptic plasticity, and learning [PMID:35099830, PMID:39650798]. Aberrant elevation of LAMTOR1-driven mTORC1 signaling contributes to the neuronal dysfunction of Angelman syndrome, where loss of UBE3A stabilizes LAMTOR1 and hyperactivates mTORC1 in hippocampal neurons [PMID:30020076].","teleology":[{"year":2010,"claim":"Before its signaling role was defined, LAMTOR1 was placed at the late endosome/lysosome surface and linked to a discrete cellular process—cholesterol homeostasis—establishing it as a lipid-anchored membrane protein with functional consequences for cargo trafficking.","evidence":"siRNA knockdown, overexpression, cholesterol assays and detergent-resistant membrane proteomics in cultured cells","pmids":["20544018"],"confidence":"Medium","gaps":["Did not connect cholesterol phenotype to a defined molecular complex or signaling pathway","Mechanism linking the lysosomal anchor to cholesterol egress unresolved"]},{"year":2010,"claim":"A parallel line established a cytoplasmic-facing function in cell motility, showing LAMTOR1 activates RhoA/RhoC to drive metastasis, indicating roles beyond a passive membrane anchor.","evidence":"shRNA knockdown, mouse tail-vein metastasis assay, Rho activation assays in melanoma cells","pmids":["21087931"],"confidence":"Medium","gaps":["Relationship between Rho activation and the lysosomal Ragulator function not reconciled","Direct biochemical link to Rho GTPases not structurally defined"]},{"year":2012,"claim":"Loss-of-function work showed LAMTOR1 restrains autophagic flux and lysosomal-driven cell death, revealing an mTORC1-independent branch in which its depletion triggers ROS-dependent p53 activation.","evidence":"siRNA knockdown, ROS and apoptosis assays, autophagic flux and p53 pathway analysis","pmids":["22513874"],"confidence":"Medium","gaps":["Mechanism coupling lysosomal scattering to ROS production unclear","Did not distinguish scaffold loss from broader lysosome dysfunction"]},{"year":2013,"claim":"In vivo conditional ablation in epidermis tied LAMTOR1 to lysosome maturation and lysosome–autophagosome coupling required for tissue development, moving the gene from cell-line phenotypes to an organismal developmental role.","evidence":"Epidermis-specific conditional knockout mouse, electron microscopy, lysosome behavior assays","pmids":["23781028"],"confidence":"High","gaps":["Did not separate mTORC1-dependent from mTORC1-independent contributions to the barrier defect"]},{"year":2014,"claim":"The integrated biochemical model was consolidated: LAMTOR1 is the lipid-anchored scaffold of the pentameric Ragulator that engages Rag GTPases and v-ATPase to activate mTORC1 and recruits MEK1 via MP1/LAMTOR3 for MAPK signaling.","evidence":"Biochemical fractionation, reciprocal co-immunoprecipitation, membrane localization assays synthesizing multi-lab work","pmids":["24377928"],"confidence":"High","gaps":["Stoichiometry of v-ATPase engagement during amino acid sensing not fully resolved","Structural basis of LAMTOR1 anchoring not described here"]},{"year":2015,"claim":"Mechanistic dissection showed LAMTOR1 loss promotes starvation survival via p27kip1, identifying a specific effector linking the scaffold to autophagy regulation.","evidence":"p18 knockout MEFs, LC3-II immunoblot, p27kip1 phosphorylation analysis and epistasis by p27kip1 knockdown","pmids":["26032166"],"confidence":"Medium","gaps":["How LAMTOR1 controls p27kip1 phosphorylation biochemically unresolved","Relationship to mTORC1-dependent autophagy control not delineated"]},{"year":2016,"claim":"Myeloid-specific genetics established LAMTOR1 as the amino-acid-sensing scaffold required for M2 macrophage polarization and identified LXR/25-hydroxycholesterol as downstream effectors, translating the molecular hub into immune cell fate.","evidence":"Myeloid conditional knockout, polarization assays, v-ATPase/mTOR pharmacology, 25-HC measurements","pmids":["27731330"],"confidence":"High","gaps":["How mTORC1 output specifies M2 over M1 transcriptionally not fully mapped"]},{"year":2017,"claim":"T cell and Treg conditional knockouts demonstrated LAMTOR1 is essential for mTORC1-dependent T cell proliferation, Th17 polarization, and regulatory T cell suppressive function, with loss causing autoimmunity.","evidence":"T-cell- and Foxp3-specific conditional KO mice, polarization/proliferation assays, mTORC1 readouts, EAE model","pmids":["28768723"],"confidence":"High","gaps":["Selective dependence of Th17 (but not Th1/Th2) on LAMTOR1 mechanistically unexplained"]},{"year":2018,"claim":"Two studies placed LAMTOR1 upstream of TFEB and revealed disease-relevant regulation: LAMTOR1/mTORC1 controls TFEB phosphorylation in innate immunity, and UBE3A-mediated degradation of LAMTOR1 links its stability to Angelman syndrome neuronal pathology.","evidence":"Myeloid conditional KO with TFEB localization and LPS/bleomycin challenge; co-IP, ubiquitination assays, in vivo knockdown rescue, LTP and behavior in an Angelman model","pmids":["29686050","30020076"],"confidence":"High","gaps":["UBE3A ubiquitination site on LAMTOR1 not mapped","How TFEB control integrates with other LAMTOR1 outputs not unified"]},{"year":2019,"claim":"The lipid-modification logic and additional functional contexts were expanded: palmitoylation of LAMTOR1 was shown to be dynamic and instructive for mTORC1 activation, and LAMTOR1 was implicated in xenophagy and pancreatic β-cell insulin secretion.","evidence":"Acyl-RAC palmitoylation detection with palmitoylation inhibitors and mTORC1 assays; LAMTOR1/2 KO cells with bacterial infection assays; β-cell conditional KO with metabolic clamps","pmids":["31001086","30428163","31939616"],"confidence":"Medium","gaps":["The palmitoyltransferase driving the dynamic signal was not identified at this stage","Direct biochemical role of LAMTOR1 in xenophagy receptor recruitment unclear"]},{"year":2020,"claim":"Intestinal conditional knockout with rapamycin phenocopy demonstrated that lysosomal mTORC1 anchored by LAMTOR1 is required for goblet cell differentiation, extending the scaffold to epithelial cell-fate decisions.","evidence":"Intestinal epithelium-specific conditional KO, mTORC1 localization assays, histology, organoids, rapamycin treatment","pmids":["32641600"],"confidence":"High","gaps":["Transcriptional program downstream of mTORC1 driving goblet specification not defined"]},{"year":2021,"claim":"Vascular work showed LAMTOR1 induction is a node by which extracellular signals (platelet microvesicles via Src) drive mTORC1-dependent smooth muscle dedifferentiation and intimal hyperplasia.","evidence":"siRNA knockdown, SMC-specific conditional KO, mTORC1 phospho-readouts, Src inhibitor epistasis, in vivo injury model","pmids":["34604241"],"confidence":"Medium","gaps":["Mechanism by which Src induces LAMTOR1 expression not detailed"]},{"year":2022,"claim":"A landmark expansion uncovered an mTORC1-independent function: LAMTOR1 directly inhibits TRPML1 via its N-terminus to control dendritic lysosome trafficking, synaptic plasticity and learning; concurrently, USP32-mediated deubiquitination and NMT1 myristoylation were shown to control LAMTOR1 v-ATPase engagement, stability and localization.","evidence":"Co-IP, in vivo CA1 deletion, Ca2+ imaging, decoy-peptide disruption, LTP and behavior; USP32 KO with ubiquitination/Co-IP/localization assays; NMT1 KO with Gly2 mutagenesis and stability assays","pmids":["35099830","36476874","34999170"],"confidence":"High","gaps":["Structural basis of LAMTOR1–TRPML1 inhibition not resolved","How mTORC1-dependent and TRPML1-dependent functions are coordinated on the same scaffold unknown"]},{"year":2024,"claim":"The post-translational control circuit was completed and new degradative cargo functions emerged: TRAF4 K63-ubiquitinates LAMTOR1 at K151 to promote Rag binding, while LAMTOR1 was shown to route PD-L1 and cGAS to lysosomal degradation and to be transcriptionally controlled by Nrf2/p300 under oxidative stress upstream of TFEB.","evidence":"In vitro ubiquitination, K151R knock-in, TRAF4 KO with mTORC1 assays; Co-IP with HRS and cGAS, lysosomal degradation/exosome and interferon assays; promoter reporter, p300 inhibitor, TFEB localization with in vivo models","pmids":["38229144","39223601","39361643","39424220"],"confidence":"Medium","gaps":["How K151 ubiquitination geometrically promotes Rag binding not structurally shown","Whether cargo-degradation roles depend on the Ragulator scaffold versus separable LAMTOR1 functions unclear"]},{"year":2025,"claim":"Chemical-biology approaches validated LAMTOR1 as a druggable node: the natural compound acacetin binds LAMTOR1 and releases it from the Ragulator to inhibit mTORC1 and induce autophagy, ameliorating hepatic lipid accumulation.","evidence":"DARTS/LC-MS target identification, CETSA, LAMTOR1 KD phenocopy, mTORC1/AMPK and autophagy assays, CDAHFD mouse model","pmids":["40548398"],"confidence":"Medium","gaps":["Binding site of acacetin on LAMTOR1 not mapped","Whether compound directly disrupts a specific LAMTOR–LAMTOR interface unresolved"]},{"year":2026,"claim":"Identification of ZDHHC9 as the palmitoyltransferase acting on Cys3/Cys4 closed the loop on the dynamic palmitoylation observed earlier, linking a specific enzyme to mTORC1 recruitment in cancer.","evidence":"Palmitoylation assays, Cys3/4 mutagenesis, ZDHHC9 KO/KD, mTORC1 recruitment and Co-IP in renal cell carcinoma","pmids":["41856969"],"confidence":"Medium","gaps":["How ZDHHC9 activity toward LAMTOR1 is itself regulated by amino acids not addressed"]},{"year":null,"claim":"How the distinct mTORC1-scaffolding and TRPML1-inhibitory functions of a single small LAMTOR1 protein are spatially and temporally coordinated, and how the dense layer of lipid and ubiquitin modifications is switched in response to specific stimuli, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of LAMTOR1 within the Ragulator or bound to TRPML1","The hierarchy and crosstalk among myristoylation, palmitoylation, K63/degradative ubiquitination, and deubiquitination is undefined","Whether the cytoplasmic Rho-activating and lysosomal scaffolding activities are physically separable is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,0]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,15]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,1,10]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,16]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,8,13,21]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,6,8,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,13,16]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,5,11,21]}],"complexes":["Ragulator"],"partners":["LAMTOR2","LAMTOR3","TRPML1","TRAF4","USP32","UBE3A","HRS","CGAS"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6IAA8","full_name":"Ragulator complex protein LAMTOR1","aliases":["Late endosomal/lysosomal adaptor and MAPK and MTOR activator 1","Lipid raft adaptor protein p18","Protein associated with DRMs and endosomes","p27Kip1-releasing factor from RhoA","p27RF-Rho"],"length_aa":161,"mass_kda":17.7,"function":"Key component of the Ragulator complex, a multiprotein complex involved in amino acid sensing and activation of mTORC1, a signaling complex promoting cell growth in response to growth factors, energy levels, and amino acids (PubMed:20381137, PubMed:22980980, PubMed:29158492). Activated by amino acids through a mechanism involving the lysosomal V-ATPase, the Ragulator plays a dual role for the small GTPases Rag (RagA/RRAGA, RagB/RRAGB, RagC/RRAGC and/or RagD/RRAGD): it (1) acts as a guanine nucleotide exchange factor (GEF), activating the small GTPases Rag and (2) mediates recruitment of Rag GTPases to the lysosome membrane (PubMed:22980980, PubMed:28935770, PubMed:29158492, PubMed:30181260, PubMed:31001086, PubMed:32686708, PubMed:36476874). Activated Ragulator and Rag GTPases function as a scaffold recruiting mTORC1 to lysosomes where it is in turn activated (PubMed:20381137, PubMed:22980980, PubMed:29158492). LAMTOR1 is directly responsible for anchoring the Ragulator complex to the lysosomal membrane (PubMed:31001086, PubMed:32686708). LAMTOR1 wraps around the other subunits of the Ragulator complex to hold them in place and interacts with the Rag GTPases, thereby playing a key role in the recruitment of the mTORC1 complex to lysosomes (PubMed:28935770, PubMed:29107538, PubMed:29123114, PubMed:29285400). Also involved in the control of embryonic stem cells differentiation via non-canonical RagC/RRAGC and RagD/RRAGD activation: together with FLCN, it is necessary to recruit and activate RagC/RRAGC and RagD/RRAGD at the lysosomes, and to induce exit of embryonic stem cells from pluripotency via non-canonical, mTOR-independent TFE3 inactivation (By similarity). Also required for late endosomes/lysosomes biogenesis it may regulate both the recycling of receptors through endosomes and the MAPK signaling pathway through recruitment of some of its components to late endosomes (PubMed:20381137, PubMed:22980980). May be involved in cholesterol homeostasis regulating LDL uptake and cholesterol release from late endosomes/lysosomes (PubMed:20544018). May also play a role in RHOA activation (PubMed:19654316)","subcellular_location":"Lysosome membrane; Late endosome membrane","url":"https://www.uniprot.org/uniprotkb/Q6IAA8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LAMTOR1","classification":"Not Classified","n_dependent_lines":235,"n_total_lines":1208,"dependency_fraction":0.1945364238410596},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"LAMP2","stoichiometry":10.0},{"gene":"LAMTOR2","stoichiometry":10.0},{"gene":"PIP4P1","stoichiometry":10.0},{"gene":"LAMP1","stoichiometry":4.0},{"gene":"CEP192","stoichiometry":0.2},{"gene":"RAB7A","stoichiometry":0.2},{"gene":"TMEM106B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LAMTOR1","total_profiled":1310},"omim":[{"mim_id":"618834","title":"LATE ENDOSOMAL/LYSOSOMAL ADAPTOR, MAPK AND MTOR ACTIVATOR 4; LAMTOR4","url":"https://www.omim.org/entry/618834"},{"mim_id":"616599","title":"BLOC1-RELATED COMPLEX, SUBUNIT 6; BORCS6","url":"https://www.omim.org/entry/616599"},{"mim_id":"616203","title":"SOLUTE CARRIER FAMILY 38, MEMBER 9; SLC38A9","url":"https://www.omim.org/entry/616203"},{"mim_id":"613510","title":"LATE ENDOSOMAL/LYSOSOMAL ADAPTOR, MAPK AND MTOR ACTIVATOR 1; LAMTOR1","url":"https://www.omim.org/entry/613510"},{"mim_id":"608521","title":"LATE ENDOSOMAL/LYSOSOMAL ADAPTOR, MAPK AND MTOR ACTIVATOR 5; LAMTOR5","url":"https://www.omim.org/entry/608521"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Golgi apparatus","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LAMTOR1"},"hgnc":{"alias_symbol":["FLJ20625","p18","p27RF-Rho","Pdro","Ragulator1"],"prev_symbol":["C11orf59"]},"alphafold":{"accession":"Q6IAA8","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6IAA8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6IAA8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6IAA8-F1-predicted_aligned_error_v6.png","plddt_mean":80.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LAMTOR1","jax_strain_url":"https://www.jax.org/strain/search?query=LAMTOR1"},"sequence":{"accession":"Q6IAA8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6IAA8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6IAA8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6IAA8"}},"corpus_meta":[{"pmid":"27731330","id":"PMC_27731330","title":"Polarization of M2 macrophages requires Lamtor1 that integrates cytokine and 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1950)","url":"https://pubmed.ncbi.nlm.nih.gov/28768723","citation_count":16,"is_preprint":false},{"pmid":"36070764","id":"PMC_36070764","title":"LAMTOR1 degrades MHC-II via the endocytic in hepatocellular carcinoma.","date":"2022","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/36070764","citation_count":11,"is_preprint":false},{"pmid":"34604241","id":"PMC_34604241","title":"Platelet-Derived Microvesicles Promote VSMC Dedifferentiation After Intimal Injury via Src/Lamtor1/mTORC1 Signaling.","date":"2021","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/34604241","citation_count":11,"is_preprint":false},{"pmid":"26032166","id":"PMC_26032166","title":"Depletion of p18/LAMTOR1 promotes cell survival via activation of p27(kip1) -dependent autophagy under starvation.","date":"2015","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/26032166","citation_count":11,"is_preprint":false},{"pmid":"34095141","id":"PMC_34095141","title":"Macrophage LAMTOR1 Deficiency Prevents Dietary Obesity and Insulin Resistance Through Inflammation-Induced Energy Expenditure.","date":"2021","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/34095141","citation_count":9,"is_preprint":false},{"pmid":"40548398","id":"PMC_40548398","title":"Inhibition of lysosomal LAMTOR1 increases autophagy by suppressing the MTORC1 pathway to ameliorate lipid accumulations in MAFLD.","date":"2025","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/40548398","citation_count":7,"is_preprint":false},{"pmid":"39361643","id":"PMC_39361643","title":"LAMTOR1 ablation impedes cGAS degradation caused by chemotherapy and promotes antitumor immunity.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/39361643","citation_count":7,"is_preprint":false},{"pmid":"35836818","id":"PMC_35836818","title":"Arterial cyclic stretch regulates Lamtor1 and promotes neointimal hyperplasia via circSlc8a1/miR-20a-5p axis in vein grafts.","date":"2022","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/35836818","citation_count":7,"is_preprint":false},{"pmid":"20510017","id":"PMC_20510017","title":"Comparative analysis of fat and muscle proteins in fenofibrate-fed type II diabetic OLETF rats: the fenofibrate-dependent expression of PEBP or C11orf59 protein.","date":"2010","source":"BMB reports","url":"https://pubmed.ncbi.nlm.nih.gov/20510017","citation_count":6,"is_preprint":false},{"pmid":"30806216","id":"PMC_30806216","title":"Roles of Lamtor1 in Macrophages, CD4+ T-cells, and Regulatory T-cells.","date":"2018","source":"Critical reviews in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30806216","citation_count":5,"is_preprint":false},{"pmid":"32641600","id":"PMC_32641600","title":"p18/Lamtor1-mTORC1 Signaling Controls Development of Mucin-producing Goblet Cells in the Intestine.","date":"2020","source":"Cell structure and function","url":"https://pubmed.ncbi.nlm.nih.gov/32641600","citation_count":4,"is_preprint":false},{"pmid":"39424220","id":"PMC_39424220","title":"Regulation of LAMTOR1 by oxidative stress in retinal pigment epithelium: Implications for age-related macular degeneration pathogenesis.","date":"2024","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/39424220","citation_count":3,"is_preprint":false},{"pmid":"28435396","id":"PMC_28435396","title":"Lentivirus-mediated knockdown of P27RF-Rho inhibits hepatocellular carcinoma cell growth.","date":"2017","source":"Contemporary oncology (Poznan, Poland)","url":"https://pubmed.ncbi.nlm.nih.gov/28435396","citation_count":2,"is_preprint":false},{"pmid":"39270482","id":"PMC_39270482","title":"LAMTOR1/mTORC1 promotes CD276 to induce immunosuppression via PI3K/Akt/MMP signaling pathway in Clostridium perfringens-induced necrotic enteritis of laying hens.","date":"2024","source":"Poultry science","url":"https://pubmed.ncbi.nlm.nih.gov/39270482","citation_count":2,"is_preprint":false},{"pmid":"39650798","id":"PMC_39650798","title":"LAMTOR1 regulates dendritic lysosomal positioning in hippocampal neurons through TRPML1 inhibition.","date":"2024","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/39650798","citation_count":1,"is_preprint":false},{"pmid":"34505434","id":"PMC_34505434","title":"[Identification of LAMTOR1-regulated metabolites using ultra-performance liquid chromatography coupled with time-of-flight mass spectrometry in malignant transformation of liver inflammation].","date":"2021","source":"Se pu = Chinese journal of chromatography","url":"https://pubmed.ncbi.nlm.nih.gov/34505434","citation_count":1,"is_preprint":false},{"pmid":"41856969","id":"PMC_41856969","title":"ZDHHC9 palmitoylates LAMTOR1 to promote renal cell carcinoma malignant progression.","date":"2026","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41856969","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19740,"output_tokens":7021,"usd":0.082267,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16189,"output_tokens":5957,"usd":0.114935,"stage2_stop_reason":"end_turn"},"total_usd":0.197202,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"LAMTOR1/p18 is a membrane protein specifically localized to the surface of late endosomes/lysosomes via N-terminal myristoylation and palmitoylation, where it serves as the anchor for the Ragulator complex (containing p14/LAMTOR2, MP1/LAMTOR3, HBXIP, and C7orf59). The Ragulator interacts with RagAB/CD GTPases and V-ATPase to activate mTORC1 on the lysosomal surface. The Ragulator also regulates a branch of the MAPK pathway by recruiting MEK1 to MP1/LAMTOR3.\",\n      \"method\": \"Biochemical fractionation, co-immunoprecipitation, membrane localization assays, review of prior experimental work\",\n      \"journal\": \"Methods in enzymology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, replicated across multiple labs, convergent findings from multiple studies establishing complex membership and lysosomal anchor function\",\n      \"pmids\": [\"24377928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LAMTOR1 (Pdro/C11orf59) is localized to late endosomes/lysosomes through N-terminal myristoylation and palmitoylation. Depletion of LAMTOR1 by siRNA increases cellular free cholesterol content, accompanied by increased cholesterol efflux, stimulated LDL uptake, and increased cholesterol egress from late endosomes/lysosomes, indicating a role in cholesterol homeostasis.\",\n      \"method\": \"siRNA knockdown, stable overexpression, cholesterol measurement assays, subcellular fractionation, proteomic analysis of detergent-resistant membranes\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods (KD, OE, cholesterol assays, fractionation) establishing localization and functional role in cholesterol trafficking\",\n      \"pmids\": [\"20544018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LAMTOR1 (p27RF-Rho) promotes cancer metastasis by activating RhoA and RhoC, freeing RhoA from inhibition by cytoplasmic p27kip1. Knockdown of p27RF-Rho in metastatic melanoma cells markedly decreased lung metastasis, and p27RF-Rho regulated cellular adhesion, motility, and pericellular proteolysis through Rho activity.\",\n      \"method\": \"shRNA knockdown, in vivo mouse tail-vein metastasis assay, cell adhesion and motility assays, Rho activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, in vivo loss-of-function with defined metastatic phenotype and Rho activation readouts\",\n      \"pmids\": [\"21087931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LAMTOR1 depletion alters lysosomal activation: lysosomes become scattered in positioning but remain functional for cathepsin B maturation. LAMTOR1 loss stimulates autophagic flux, leading to excessive reactive oxygen species (ROS) production, which triggers p53-dependent cell cycle arrest and apoptosis. This lysosomal cell death pathway does not require mTORC1 activity.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, ROS measurement, apoptosis assays, autophagic flux assays, p53 pathway analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods establishing mechanistic pathway from lysosomal dysregulation to p53-dependent death\",\n      \"pmids\": [\"22513874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional ablation of p18/LAMTOR1 in mouse epidermis attenuated lysosome function, resulting in accumulation of immature lysosomes and autophagosomes, and defective functional interaction between lysosomes and autophagosomes. This caused failure of corneocyte maturation and loss of skin barrier function, demonstrating that p18-mediated pathways control lysosome-mediated catabolic processes required for epidermal development.\",\n      \"method\": \"Conditional knockout mouse (Cre-lox), electron microscopy, cell culture lysosome behavior assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with defined cellular phenotype, electron microscopy ultrastructural analysis, and cell culture mechanistic follow-up\",\n      \"pmids\": [\"23781028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lamtor1 forms an amino-acid sensing complex with lysosomal v-ATPase and serves as the scaffold for amino acid-activated mTORC1. Lamtor1 is critically required for M2 macrophage polarization; its deficiency, amino-acid starvation, or inhibition of v-ATPase and mTOR result in defective M2 and enhanced M1 polarization. Liver X receptor (LXR) and production of 25-hydroxycholesterol are identified as downstream targets of Lamtor1 and mTORC1 in this pathway.\",\n      \"method\": \"Conditional knockout mouse (myeloid-specific), macrophage polarization assays, pharmacological inhibition of v-ATPase and mTOR, 25-hydroxycholesterol measurements, LXR pathway analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO, multiple orthogonal pharmacological and genetic approaches, identification of downstream effectors\",\n      \"pmids\": [\"27731330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Lamtor1-deficient CD4+ T cells exhibit marked reductions in proliferation, IL-2 production, mTORC1 activity, and purine/lipid-synthesis gene expression. Th17 polarization, but not Th1/Th2, is diminished. Lamtor1-deficient regulatory T cells lose suppressive function and CTLA-4 expression, resulting in severe autoimmunity, indicating that Lamtor1 is essential for mTORC1-dependent T cell function.\",\n      \"method\": \"T cell-specific and Foxp3-specific conditional knockout mice, T cell polarization assays, proliferation assays, mTORC1 activity measurement, experimental autoimmune encephalomyelitis model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional KO mouse strains, multiple orthogonal cellular readouts, in vivo disease model\",\n      \"pmids\": [\"28768723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"UBE3A ubiquitinates p18/LAMTOR1, resulting in its proteasomal degradation. UBE3A deficiency (as in Angelman syndrome) leads to increased lysosomal localization of p18 and other Ragulator-Rag complex members and increased mTORC1 activity in hippocampal neurons. p18 knockdown in CA1 neurons of AS mice reduces elevated mTORC1 activity and improves dendritic spine maturation, LTP, and learning.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, in vivo knockdown in AS mouse model, mTORC1 activity assays, electrophysiology (LTP), behavioral tests\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including biochemical ubiquitination assays, in vivo rescue experiments, and functional readouts in a disease model\",\n      \"pmids\": [\"30020076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lamtor1 controls innate immune responses by regulating mTORC1-dependent phosphorylation and nuclear translocation of TFEB (master regulator of lysosome/autophagosome biogenesis). Myeloid-specific Lamtor1 KO mice show nuclear TFEB translocation in alveolar macrophages and hypersensitivity to LPS and bleomycin.\",\n      \"method\": \"Myeloid-specific conditional knockout mouse, TFEB localization assays, LPS and bleomycin challenge models, immunofluorescence\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO, mechanistic pathway placement (Lamtor1→mTORC1→TFEB phosphorylation), in vivo disease model\",\n      \"pmids\": [\"29686050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LAMTOR1 is directly palmitoylated (covalent lipid modification), and this palmitoylation is rapidly increased prior to mTORC1 activation by amino acids. Acute pharmacological inhibition of palmitoylation prevents amino acid-dependent mTORC1 activation in HEK293T cells and BDNF-dependent mTORC1 activation in hippocampal neurons, indicating that dynamic palmitoylation of LAMTOR1 is actively involved in mTORC1 signaling rather than merely permissive.\",\n      \"method\": \"Palmitoyl-proteomics, acyl-RAC assay (direct palmitoylation detection), pharmacological inhibition of palmitoylation, mTORC1 activity assays in HEK293T cells and primary hippocampal neurons\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, direct palmitoylation detection assay plus functional rescue, two cell types tested\",\n      \"pmids\": [\"31001086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The LAMTOR2/LAMTOR1 complex regulates xenophagy against Group A Streptococcus and Salmonella. LAMTOR1 localizes to bacterium-containing endosomes; LAMTOR2 is recruited to damaged endosomes in a LAMTOR1-dependent manner. LAMTOR2 interacts with autophagy receptors NBR1, TAX1BP1, and p62, and is required for TAX1BP1 recruitment to pathogen-containing autophagosomes and autolysosome formation.\",\n      \"method\": \"Fluorescence microscopy, co-immunoprecipitation, LAMTOR1/2 knockout cells, bacterial infection assays, autolysosome formation assays\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, KO cells with defined phenotype, Co-IP for interaction, multiple bacterial pathogens tested\",\n      \"pmids\": [\"30428163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of LAMTOR1 in pancreatic β-cells increases glucose-stimulated insulin secretion. LAMTOR1 KO leads to mitochondrial dysfunction but increases glutamate content in insulin granules and increases ACC1 (acetyl-CoA carboxylase 1) activity, thereby enhancing the amplification pathway of insulin secretion.\",\n      \"method\": \"β-cell-specific conditional knockout mouse, hyperglycemic clamp, islet perfusion, mitochondrial functional analysis, glutamate and ACC1 activity measurements\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, in vivo conditional KO with multiple metabolic readouts and mechanistic measurements\",\n      \"pmids\": [\"31939616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Depletion of p18/LAMTOR1 promotes cell survival under starvation by stimulating autophagy through modulation of p27kip1 activity. In p18-deficient MEF cells, phosphorylation of p27kip1 at Thr198 is elevated and LC3-II formation and other autophagy markers are increased. Suppression of p27kip1 in p18-deficient cells mitigates starvation-induced survival advantage.\",\n      \"method\": \"p18 knockout MEF cells, cell death assays, caspase-3 cleavage, LC3-II immunoblot, p27kip1 phosphorylation analysis, siRNA knockdown of p27kip1\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, genetic KO cells with multiple biochemical readouts, epistasis via p27kip1 knockdown\",\n      \"pmids\": [\"26032166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP32 deubiquitinates LAMTOR1; USP32 knockout results in hyperubiquitination of LAMTOR1, which impairs its interaction with the vacuolar H+-ATPase, reduces Ragulator function, limits mTORC1 lysosomal recruitment, decreases mTORC1 activity, and induces autophagy.\",\n      \"method\": \"USP32 knockout (hTERT-RPE1 cells), ubiquitination assays, Co-immunoprecipitation (LAMTOR1–v-ATPase interaction), mTOR lysosomal localization by microscopy, mTORC1 activity assays, autophagy assays; C. elegans CYK-3 KD as ortholog validation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO in human cells, multiple orthogonal methods (ubiquitination, Co-IP, localization, activity), cross-species validation in C. elegans\",\n      \"pmids\": [\"36476874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LAMTOR1 directly interacts with TRPML1 through its N-terminal domain, tonically inhibiting TRPML1-mediated lysosomal Ca2+ release independently of mTORC1. LAMTOR1 deletion or disruption of LAMTOR1–TRPML1 binding increases Ca2+ release, facilitates dynein-powered lysosomal trafficking in dendrites, alters synaptic plasticity via calcineurin-mediated GluA1 dephosphorylation, and impairs learning and memory.\",\n      \"method\": \"Co-immunoprecipitation, LAMTOR1 deletion (hippocampal CA1 in vivo), Ca2+ imaging, TAT-decoy peptide disruption of interaction, lysosomal trafficking assays, LTP electrophysiology, behavioral tests (object recognition, fear conditioning)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct interaction identified by Co-IP, multiple orthogonal functional assays including in vivo deletion, peptide disruption, Ca2+ imaging, electrophysiology, and behavior\",\n      \"pmids\": [\"35099830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NMT1 myristoylates LAMTOR1 at Gly2, resulting in increased LAMTOR1 protein stability and lysosomal localization. NMT1 deficiency blocks LAMTOR1 myristoylation and inhibits mTORC1-dependent bladder cancer progression.\",\n      \"method\": \"NMT1 knockdown/knockout, myristoylation site mutagenesis (Gly2), subcellular fractionation, LAMTOR1 stability assays, in vitro and in vivo cancer progression assays, NMT1 inhibitor (B13)\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, site-directed mutagenesis establishing specific modification site, multiple in vitro and in vivo functional readouts\",\n      \"pmids\": [\"34999170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRAF4 directly interacts with LAMTOR1 and catalyzes K63-linked polyubiquitination of LAMTOR1 at K151 in an amino acid-dependent manner. This ubiquitination promotes LAMTOR1 binding to Rag GTPases and enhances mTORC1 activation. K151R knock-in or TRAF4 knockout blocks amino acid-induced mTORC1 activation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, K151R knock-in cells, TRAF4 knockout, mTORC1 activity assays, K63-linkage-specific ubiquitin analysis, in vivo colon cancer model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitination assay establishing direct E3-substrate relationship, site-specific mutagenesis (K151R), multiple orthogonal methods, in vivo validation\",\n      \"pmids\": [\"38229144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMTOR1 interacts with HRS and facilitates PD-L1 lysosomal degradation, thereby reducing exosomal PD-L1 release. This function depends on a specific ubiquitination site and an HRS binding sequence on LAMTOR1.\",\n      \"method\": \"Co-immunoprecipitation (LAMTOR1–HRS interaction), PD-L1 lysosomal degradation assays, exosome quantification, LAMTOR1 domain/mutant analysis\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, Co-IP establishing interaction, mutational dissection of functional domains, mechanistic pathway placement\",\n      \"pmids\": [\"39223601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMTOR1 interacts with and promotes accumulation of cGAS in lysosomes upon chemotherapy-induced DNA fragment exposure, leading to cGAS degradation via the receptor protein p62. LAMTOR1 deficiency increases cGAS abundance and promotes cGAS-STING pathway activation and type I interferon production.\",\n      \"method\": \"Co-immunoprecipitation (LAMTOR1–cGAS interaction), LAMTOR1 knockout, cGAS abundance and stability assays, STING pathway activation measurement, interferon production assays, in vivo tumor models\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, Co-IP establishing direct interaction, KO with defined molecular and in vivo phenotype, pathway placement\",\n      \"pmids\": [\"39361643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"p18/Lamtor1-mediated mTORC1 signaling on lysosomes is required for goblet cell differentiation in the intestinal epithelium. Conditional p18 KO in colonic crypts delocalizes mTORC1 from lysosomes, markedly decreases mTORC1 activity, increases proliferating cells, and dramatically reduces mucin-producing goblet cells. Rapamycin phenocopies goblet cell loss, confirming mTORC1 dependence.\",\n      \"method\": \"Intestinal epithelium-specific conditional knockout mouse, mTORC1 localization assays (lysosome fractionation/immunofluorescence), histology, colon crypt organoid culture, rapamycin treatment\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with defined cellular phenotype, mTORC1 delocalization measured, pharmacological phenocopy with rapamycin, organoid culture validation\",\n      \"pmids\": [\"32641600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Platelet-derived microvesicles (PMVs) promote VSMC dedifferentiation via Src-dependent induction of Lamtor1, which activates mTORC1 signaling. Knockdown of Lamtor1 attenuates PMV-induced dedifferentiation, and SMC-specific Lamtor1 KO markedly attenuates intimal hyperplasia after vascular injury in vivo.\",\n      \"method\": \"siRNA knockdown, SMC-specific conditional knockout mouse, mTORC1 activity assays (S6K and 4E-BP1 phosphorylation), Src inhibitor experiments, in vivo intimal injury model\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, conditional KO in vivo, siRNA loss-of-function, pharmacological epistasis with Src inhibitor\",\n      \"pmids\": [\"34604241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Binding of the natural compound acacetin (ACA) to LAMTOR1 induces LAMTOR1 release from the Ragulator complex, leading to mTORC1 inhibition and autophagy induction. Genetic knockdown of LAMTOR1 phenocopies ACA treatment, and this process modulates the mTORC1-AMPK axis to ameliorate lipid accumulation in MAFLD.\",\n      \"method\": \"DARTS (drug affinity responsive target stability) combined with LC-MS/MS proteomics identifying LAMTOR1 as ACA target, LAMTOR1 KD phenocopy, CETSA, mTORC1 and AMPK activity assays, autophagy flux assays, in vivo CDAHFD mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, DARTS/CETSA establishing direct drug-protein interaction, genetic KD phenocopy, in vivo model\",\n      \"pmids\": [\"40548398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMTOR1 regulates lysosomal positioning in hippocampal neuronal dendrites through TRPML1 inhibition. LAMTOR1 knockdown increases lysosomal accumulation in proximal dendrites, reversible by TRPML1 KD, inhibition, or dynein inhibitor ciliobrevin D, indicating dynein-mediated transport downstream of TRPML1 activation.\",\n      \"method\": \"LAMTOR1 knockdown, TRPML1 knockdown, pharmacological TRPML1 activation (ML-SA1), TAT-decoy peptide disrupting LAMTOR1-TRPML1 binding, dynein inhibitor (ciliobrevin D), live imaging of lysosomal distribution in cultured hippocampal neurons\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab (same group as PMID:35099830), multiple genetic/pharmacological tools, consistent with prior EMBO J findings\",\n      \"pmids\": [\"39650798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ZDHHC9 specifically palmitoylates LAMTOR1 at Cys3/Cys4 residues, enhancing mTORC1 recruitment to lysosomes and activating mTOR signaling in renal cell carcinoma.\",\n      \"method\": \"Palmitoylation assays, site-directed mutagenesis (Cys3/4), ZDHHC9 KO/KD, mTORC1 activity assays, co-immunoprecipitation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — single lab, site-specific mutagenesis identifying palmitoylation sites, functional mTORC1 recruitment assays\",\n      \"pmids\": [\"41856969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Oxidative stress reduces LAMTOR1 protein predominantly through lysosomal degradation (reversible by lysosomal inhibitors pepstatin A and NH4Cl). Nrf2 positively regulates LAMTOR1 transcription through histone acetyltransferase p300-mediated histone acetylation. LAMTOR1 overexpression reverses 4-HNE-induced TFEB nuclear translocation, placing LAMTOR1 upstream of TFEB in this stress-response pathway.\",\n      \"method\": \"Pharmacological lysosomal inhibition (pepstatin A, NH4Cl), Nrf2 overexpression, luciferase reporter assay with lamtor1 promoter deletion mutants, p300 inhibitor, acetylated histone 3 immunoblot, TFEB localization assays, in vivo NaIO3 mouse model\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods establishing lysosomal degradation mechanism, promoter analysis, and epistasis with TFEB\",\n      \"pmids\": [\"39424220\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LAMTOR1 is a myristoylated and palmitoylated lysosomal membrane anchor protein that scaffolds the pentameric Ragulator complex (with LAMTOR2/3/4/5) on late endosome/lysosome surfaces, where it integrates amino acid signals via v-ATPase interaction to activate mTORC1 and regulate MAPK signaling; it is subject to dynamic post-translational regulation including K63-linked ubiquitination by TRAF4 (promoting Rag GTPase binding), de-ubiquitination by USP32, proteasomal degradation triggered by UBE3A-mediated ubiquitination, and palmitoylation by ZDHHC9 (promoting mTORC1 recruitment), while also directly inhibiting the lysosomal Ca2+ channel TRPML1 through its N-terminal domain to control dendritic lysosomal trafficking, synaptic plasticity, and learning; collectively, LAMTOR1 controls mTORC1-dependent processes including macrophage M2 polarization, T cell function, autophagy, goblet cell differentiation, and cholesterol homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LAMTOR1 is a lysosomal membrane anchor that scaffolds the pentameric Ragulator complex on the surface of late endosomes/lysosomes, where it integrates amino acid signals through interaction with the v-ATPase to recruit and activate mTORC1, while also routing a branch of MAPK signaling [#0]. Its lysosomal positioning and stability depend on N-terminal lipid modifications: NMT1 myristoylates Gly2 to stabilize the protein and direct it to lysosomes [#15], and palmitoylation—including ZDHHC9-mediated modification at Cys3/Cys4—is rapidly induced ahead of amino-acid-driven mTORC1 activation and is required for mTORC1 recruitment [#9, #23]. LAMTOR1 function is further tuned by ubiquitination: TRAF4 catalyzes amino-acid-dependent K63-linked polyubiquitination at K151 to promote Rag GTPase binding and mTORC1 activation [#16], USP32 deubiquitinates LAMTOR1 to preserve its v-ATPase interaction and Ragulator activity [#13], and UBE3A-mediated ubiquitination targets it for proteasomal degradation [#7]. Through this mTORC1 hub, LAMTOR1 governs autophagy and the lysosomal biogenesis program via TFEB [#8, #24], and controls diverse cell-fate and physiological outputs including macrophage M2 polarization [#5], T cell function and immune tolerance [#6], intestinal goblet cell differentiation [#19], and epidermal lysosome-dependent catabolism required for skin barrier formation [#4]. Independently of mTORC1, LAMTOR1 directly binds and tonically inhibits the lysosomal Ca2+ channel TRPML1 through its N-terminal domain, thereby controlling dynein-driven dendritic lysosome trafficking, synaptic plasticity, and learning [#14, #22]. Aberrant elevation of LAMTOR1-driven mTORC1 signaling contributes to the neuronal dysfunction of Angelman syndrome, where loss of UBE3A stabilizes LAMTOR1 and hyperactivates mTORC1 in hippocampal neurons [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Before its signaling role was defined, LAMTOR1 was placed at the late endosome/lysosome surface and linked to a discrete cellular process—cholesterol homeostasis—establishing it as a lipid-anchored membrane protein with functional consequences for cargo trafficking.\",\n      \"evidence\": \"siRNA knockdown, overexpression, cholesterol assays and detergent-resistant membrane proteomics in cultured cells\",\n      \"pmids\": [\"20544018\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not connect cholesterol phenotype to a defined molecular complex or signaling pathway\", \"Mechanism linking the lysosomal anchor to cholesterol egress unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A parallel line established a cytoplasmic-facing function in cell motility, showing LAMTOR1 activates RhoA/RhoC to drive metastasis, indicating roles beyond a passive membrane anchor.\",\n      \"evidence\": \"shRNA knockdown, mouse tail-vein metastasis assay, Rho activation assays in melanoma cells\",\n      \"pmids\": [\"21087931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between Rho activation and the lysosomal Ragulator function not reconciled\", \"Direct biochemical link to Rho GTPases not structurally defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Loss-of-function work showed LAMTOR1 restrains autophagic flux and lysosomal-driven cell death, revealing an mTORC1-independent branch in which its depletion triggers ROS-dependent p53 activation.\",\n      \"evidence\": \"siRNA knockdown, ROS and apoptosis assays, autophagic flux and p53 pathway analysis\",\n      \"pmids\": [\"22513874\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling lysosomal scattering to ROS production unclear\", \"Did not distinguish scaffold loss from broader lysosome dysfunction\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"In vivo conditional ablation in epidermis tied LAMTOR1 to lysosome maturation and lysosome–autophagosome coupling required for tissue development, moving the gene from cell-line phenotypes to an organismal developmental role.\",\n      \"evidence\": \"Epidermis-specific conditional knockout mouse, electron microscopy, lysosome behavior assays\",\n      \"pmids\": [\"23781028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate mTORC1-dependent from mTORC1-independent contributions to the barrier defect\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The integrated biochemical model was consolidated: LAMTOR1 is the lipid-anchored scaffold of the pentameric Ragulator that engages Rag GTPases and v-ATPase to activate mTORC1 and recruits MEK1 via MP1/LAMTOR3 for MAPK signaling.\",\n      \"evidence\": \"Biochemical fractionation, reciprocal co-immunoprecipitation, membrane localization assays synthesizing multi-lab work\",\n      \"pmids\": [\"24377928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of v-ATPase engagement during amino acid sensing not fully resolved\", \"Structural basis of LAMTOR1 anchoring not described here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mechanistic dissection showed LAMTOR1 loss promotes starvation survival via p27kip1, identifying a specific effector linking the scaffold to autophagy regulation.\",\n      \"evidence\": \"p18 knockout MEFs, LC3-II immunoblot, p27kip1 phosphorylation analysis and epistasis by p27kip1 knockdown\",\n      \"pmids\": [\"26032166\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How LAMTOR1 controls p27kip1 phosphorylation biochemically unresolved\", \"Relationship to mTORC1-dependent autophagy control not delineated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Myeloid-specific genetics established LAMTOR1 as the amino-acid-sensing scaffold required for M2 macrophage polarization and identified LXR/25-hydroxycholesterol as downstream effectors, translating the molecular hub into immune cell fate.\",\n      \"evidence\": \"Myeloid conditional knockout, polarization assays, v-ATPase/mTOR pharmacology, 25-HC measurements\",\n      \"pmids\": [\"27731330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How mTORC1 output specifies M2 over M1 transcriptionally not fully mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"T cell and Treg conditional knockouts demonstrated LAMTOR1 is essential for mTORC1-dependent T cell proliferation, Th17 polarization, and regulatory T cell suppressive function, with loss causing autoimmunity.\",\n      \"evidence\": \"T-cell- and Foxp3-specific conditional KO mice, polarization/proliferation assays, mTORC1 readouts, EAE model\",\n      \"pmids\": [\"28768723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selective dependence of Th17 (but not Th1/Th2) on LAMTOR1 mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Two studies placed LAMTOR1 upstream of TFEB and revealed disease-relevant regulation: LAMTOR1/mTORC1 controls TFEB phosphorylation in innate immunity, and UBE3A-mediated degradation of LAMTOR1 links its stability to Angelman syndrome neuronal pathology.\",\n      \"evidence\": \"Myeloid conditional KO with TFEB localization and LPS/bleomycin challenge; co-IP, ubiquitination assays, in vivo knockdown rescue, LTP and behavior in an Angelman model\",\n      \"pmids\": [\"29686050\", \"30020076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"UBE3A ubiquitination site on LAMTOR1 not mapped\", \"How TFEB control integrates with other LAMTOR1 outputs not unified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The lipid-modification logic and additional functional contexts were expanded: palmitoylation of LAMTOR1 was shown to be dynamic and instructive for mTORC1 activation, and LAMTOR1 was implicated in xenophagy and pancreatic β-cell insulin secretion.\",\n      \"evidence\": \"Acyl-RAC palmitoylation detection with palmitoylation inhibitors and mTORC1 assays; LAMTOR1/2 KO cells with bacterial infection assays; β-cell conditional KO with metabolic clamps\",\n      \"pmids\": [\"31001086\", \"30428163\", \"31939616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The palmitoyltransferase driving the dynamic signal was not identified at this stage\", \"Direct biochemical role of LAMTOR1 in xenophagy receptor recruitment unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Intestinal conditional knockout with rapamycin phenocopy demonstrated that lysosomal mTORC1 anchored by LAMTOR1 is required for goblet cell differentiation, extending the scaffold to epithelial cell-fate decisions.\",\n      \"evidence\": \"Intestinal epithelium-specific conditional KO, mTORC1 localization assays, histology, organoids, rapamycin treatment\",\n      \"pmids\": [\"32641600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional program downstream of mTORC1 driving goblet specification not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Vascular work showed LAMTOR1 induction is a node by which extracellular signals (platelet microvesicles via Src) drive mTORC1-dependent smooth muscle dedifferentiation and intimal hyperplasia.\",\n      \"evidence\": \"siRNA knockdown, SMC-specific conditional KO, mTORC1 phospho-readouts, Src inhibitor epistasis, in vivo injury model\",\n      \"pmids\": [\"34604241\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which Src induces LAMTOR1 expression not detailed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A landmark expansion uncovered an mTORC1-independent function: LAMTOR1 directly inhibits TRPML1 via its N-terminus to control dendritic lysosome trafficking, synaptic plasticity and learning; concurrently, USP32-mediated deubiquitination and NMT1 myristoylation were shown to control LAMTOR1 v-ATPase engagement, stability and localization.\",\n      \"evidence\": \"Co-IP, in vivo CA1 deletion, Ca2+ imaging, decoy-peptide disruption, LTP and behavior; USP32 KO with ubiquitination/Co-IP/localization assays; NMT1 KO with Gly2 mutagenesis and stability assays\",\n      \"pmids\": [\"35099830\", \"36476874\", \"34999170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of LAMTOR1–TRPML1 inhibition not resolved\", \"How mTORC1-dependent and TRPML1-dependent functions are coordinated on the same scaffold unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The post-translational control circuit was completed and new degradative cargo functions emerged: TRAF4 K63-ubiquitinates LAMTOR1 at K151 to promote Rag binding, while LAMTOR1 was shown to route PD-L1 and cGAS to lysosomal degradation and to be transcriptionally controlled by Nrf2/p300 under oxidative stress upstream of TFEB.\",\n      \"evidence\": \"In vitro ubiquitination, K151R knock-in, TRAF4 KO with mTORC1 assays; Co-IP with HRS and cGAS, lysosomal degradation/exosome and interferon assays; promoter reporter, p300 inhibitor, TFEB localization with in vivo models\",\n      \"pmids\": [\"38229144\", \"39223601\", \"39361643\", \"39424220\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How K151 ubiquitination geometrically promotes Rag binding not structurally shown\", \"Whether cargo-degradation roles depend on the Ragulator scaffold versus separable LAMTOR1 functions unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Chemical-biology approaches validated LAMTOR1 as a druggable node: the natural compound acacetin binds LAMTOR1 and releases it from the Ragulator to inhibit mTORC1 and induce autophagy, ameliorating hepatic lipid accumulation.\",\n      \"evidence\": \"DARTS/LC-MS target identification, CETSA, LAMTOR1 KD phenocopy, mTORC1/AMPK and autophagy assays, CDAHFD mouse model\",\n      \"pmids\": [\"40548398\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding site of acacetin on LAMTOR1 not mapped\", \"Whether compound directly disrupts a specific LAMTOR–LAMTOR interface unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identification of ZDHHC9 as the palmitoyltransferase acting on Cys3/Cys4 closed the loop on the dynamic palmitoylation observed earlier, linking a specific enzyme to mTORC1 recruitment in cancer.\",\n      \"evidence\": \"Palmitoylation assays, Cys3/4 mutagenesis, ZDHHC9 KO/KD, mTORC1 recruitment and Co-IP in renal cell carcinoma\",\n      \"pmids\": [\"41856969\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How ZDHHC9 activity toward LAMTOR1 is itself regulated by amino acids not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct mTORC1-scaffolding and TRPML1-inhibitory functions of a single small LAMTOR1 protein are spatially and temporally coordinated, and how the dense layer of lipid and ubiquitin modifications is switched in response to specific stimuli, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of LAMTOR1 within the Ragulator or bound to TRPML1\", \"The hierarchy and crosstalk among myristoylation, palmitoylation, K63/degradative ubiquitination, and deubiquitination is undefined\", \"Whether the cytoplasmic Rho-activating and lysosomal scaffolding activities are physically separable is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 0]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 15]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1, 10]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 16]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 8, 13, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 6, 8, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 13, 16]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 5, 11, 21]}\n    ],\n    \"complexes\": [\n      \"Ragulator\"\n    ],\n    \"partners\": [\n      \"LAMTOR2\",\n      \"LAMTOR3\",\n      \"TRPML1\",\n      \"TRAF4\",\n      \"USP32\",\n      \"UBE3A\",\n      \"HRS\",\n      \"cGAS\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}