{"gene":"LSG1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2005,"finding":"Yeast Lsg1p (cytoplasmic GTPase) is required for the release of the nuclear export adapter Nmd3p from 60S ribosomal subunits in the cytoplasm. Mutations in LSG1 blocked Nmd3-GFP shuttling into the nucleus and pre-60S export from the nucleus; overexpression of NMD3 alleviated the export defect, indicating the block in 60S export in lsg1 mutants results indirectly from failing to recycle Nmd3p.","method":"Genetic epistasis (lsg1 mutants, NMD3 overexpression suppression), Nmd3-GFP shuttling assays, in vitro binding assays with mutant Nmd3 proteins","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and cell biological methods, suppression analysis, in vitro binding; replicated in companion paper same year","pmids":["15660131"],"is_preprint":false},{"year":2005,"finding":"A dominant Walker A motif mutation in Lsg1p traps Sqt1p (an Rpl10p chaperone/loading factor) in complexes co-immunoprecipitated with Lsg1p and Nmd3p, and also traps a mutant Rpl10p that does not normally bind stably to the subunit. This supports a model in which Sqt1p loads Rpl10p onto the Nmd3p-bound subunit after nuclear export, involving the GTPase activity of Lsg1p.","method":"Co-immunoprecipitation with dominant-negative Walker A LSG1 mutant, genetic suppression analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with dominant-negative mutant and genetic suppression, single lab, two orthogonal methods","pmids":["15831484"],"is_preprint":false},{"year":2005,"finding":"Human LSG1 (hLsg1) is an essential GTPase predominantly localized to the endoplasmic reticulum and, in some cells, to Cajal bodies in the nucleus, as determined by siRNA knockdown (essential) and localization studies.","method":"siRNA knockdown (essentiality), subcellular localization by imaging","journal":"BMC biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — localization by imaging and siRNA essentiality, single lab, two methods but no deep functional mechanism","pmids":["16209721"],"is_preprint":false},{"year":2005,"finding":"LSG1 physically associates in vivo with TIF6 and ARB1 (an ABC protein involved in ribosome biogenesis), placing LSG1 in a cytoplasmic pre-60S maturation complex.","method":"Co-immunoprecipitation / physical association in vivo","journal":"Molecular and cellular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP result in the context of characterizing ARB1, single lab","pmids":["16260602"],"is_preprint":false},{"year":2007,"finding":"Mutations in the central loop (amino acids 102-112) of Rpl10p significantly impair the release of Nmd3p, demonstrating that this loop—though not required for stable ribosome binding—plays a dynamic role in the Lsg1-dependent Nmd3 release mechanism.","method":"Mutational analysis of Rpl10, Nmd3 release assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with functional release assay, single lab, multiple mutants tested","pmids":["17761675"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structural analysis of yeast pre-60S particles purified via Nmd3 revealed that Lsg1 and Nmd3 co-occupy a specific late cytoplasmic pre-60S intermediate in which ribosomal proteins uL16, uL10, uL11, eL40, and eL41 are absent. Lsg1 and Nmd3 are located near the peptidyl-transferase center (PTC), and Nmd3 recognizes the PTC in its near-mature conformation.","method":"Cryo-electron microscopy (cryo-EM) structural determination","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with direct localization of Lsg1 on pre-60S particle, providing mechanistic context for assembly checkpoint","pmids":["28112732"],"is_preprint":false},{"year":2013,"finding":"Drosophila NS3 (Nucleostemin 3), the functional ortholog of yeast and human Lsg1, possesses GTPase activity demonstrated biochemically, and is required for release of the nuclear export adapter from the large ribosomal subunit, thereby enabling sustained ribosome production and translation.","method":"Genetic (null alleles, RNAi, hypomorphic allele) and biochemical (GTPase assay)","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical GTPase assay combined with genetic loss-of-function, single lab, ortholog study in Drosophila","pmids":["23436180"],"is_preprint":false},{"year":2018,"finding":"Drosophila NS3 (Lsg1 ortholog) is cytoplasmic and required to retain the cell cycle repressor Prospero in the neuroblast cytoplasm via a Ran-independent pathway; the GTP-binding domain and acidic domain are required for NS3 function in neuroblast proliferation and cell polarity.","method":"Genetic screen, structure-function analysis (domain deletion/mutation), subcellular localization by imaging","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structure-function with genetic loss-of-function and localization, single lab, ortholog in Drosophila","pmids":["29679561"],"is_preprint":false},{"year":2019,"finding":"Inhibition of LSG1 in human cells induces cellular senescence not through ribosome depletion or translational insufficiency, but through perturbation of endoplasmic reticulum homeostasis and dramatic upregulation of the cholesterol biosynthesis pathway.","method":"LSG1 inhibition (knockdown/small molecule), transcriptomic analysis, functional senescence assays, pathway analysis","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with specific phenotypic and pathway readouts, mechanistic exclusion of alternative explanations, single lab","pmids":["31148378"],"is_preprint":false},{"year":2020,"finding":"Recombinant yeast Lsg1 has intrinsic GTPase activity (kcat ~1 min⁻¹, Km ~34 μM for GTP). Lsg1 has greater affinity for GTP than GDP. In the presence of 60S subunits loaded with Nmd3, affinity for both nucleotides increases, especially for GTP, suggesting the Nmd3•60S pre-ribosomal particle acts as a GTP Stabilizing Factor for Lsg1.","method":"Fluorescence spectroscopy (nucleotide binding), steady-state kinetic GTPase assay with recombinant protein","journal":"Biochimica et biophysica acta. Proteins and proteomics","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with purified components and kinetic analysis, single lab, single study","pmids":["32916301"],"is_preprint":false},{"year":2024,"finding":"Human LSG1 binds to VAPs (vesicle-associated membrane protein-associated proteins) via a noncanonical FFAT-like motif. Deletion of this motif specifically disrupts LSG1 localization to the ER without perturbing LSG1-dependent recycling of NMD3 or LSG1 GTPase activity in vitro, showing the ER localization function is separable from its ribosome assembly function.","method":"Co-immunoprecipitation, FFAT-motif deletion mutagenesis, subcellular localization imaging, in vitro GTPase assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (co-IP, mutagenesis, localization, in vitro GTPase assay), mechanistic separation of two functions, single lab","pmids":["39133101"],"is_preprint":false},{"year":2026,"finding":"Bypass suppressor mutations in LSG1 partially reverse the eL24 loading defect of rei1Δ reh1Δ pre-60S particles, placing Lsg1 in a cytoplasmic assembly pathway that involves eL24 recruitment and is genetically connected to Rei1/Reh1 function.","method":"Suppressor screen (bypass suppressors of rei1Δ reh1Δ), ribosome protein composition analysis, genetic epistasis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic suppressor screen with biochemical validation of eL24 loading, preprint, single lab","pmids":["41959095"],"is_preprint":true}],"current_model":"LSG1 is a conserved circularly permuted GTPase that acts in the cytoplasm during late 60S ribosomal subunit biogenesis: after nuclear export of the pre-60S particle, LSG1 binds near the peptidyl-transferase center (together with NMD3) and uses its GTPase activity—stimulated by the NMD3•60S complex—to drive the release and nuclear recycling of the export adapter NMD3, a process that also requires loading of ribosomal protein uL16 (Rpl10p) by the chaperone Sqt1p; separately, human LSG1 binds VAPs on the ER membrane via a noncanonical FFAT-like motif, a localization function that is distinct from its NMD3-recycling activity, and LSG1 inhibition triggers ER stress and cholesterol pathway upregulation leading to cellular senescence."},"narrative":{"mechanistic_narrative":"LSG1 is a conserved circularly permuted GTPase that catalyzes a late, cytoplasmic step of large (60S) ribosomal subunit maturation by driving release and nuclear recycling of the export adapter NMD3 [PMID:15660131]. In yeast, lsg1 mutants fail to recycle Nmd3p from cytoplasmic 60S subunits, which indirectly blocks pre-60S nuclear export, a defect suppressed by NMD3 overexpression [PMID:15660131]. Cryo-EM places Lsg1 together with Nmd3 near the peptidyl-transferase center of a defined late pre-60S intermediate that still lacks uL16, uL10, uL11, eL40 and eL41, providing the structural context for the maturation checkpoint [PMID:28112732]. NMD3 release is coupled to loading of ribosomal protein Rpl10p (uL16) by the chaperone Sqt1p, which a dominant Walker A Lsg1p mutant traps in complex with Lsg1p and Nmd3p, and depends on a dynamic central loop of Rpl10p [PMID:15831484, PMID:17761675]. Lsg1's intrinsic GTPase activity is stimulated by the Nmd3·60S particle, which acts as a GTP-stabilizing factor and links nucleotide turnover to substrate engagement [PMID:32916301]. Separately, human LSG1 docks onto ER-membrane VAPs through a noncanonical FFAT-like motif; deletion of this motif abolishes ER localization without affecting NMD3 recycling or GTPase activity, establishing the ER-targeting role as functionally separable from ribosome assembly [PMID:39133101]. Consistent with this, LSG1 inhibition in human cells induces senescence through perturbed ER homeostasis and upregulated cholesterol biosynthesis rather than translational insufficiency [PMID:31148378].","teleology":[{"year":2005,"claim":"Established the core function of LSG1: it is the cytoplasmic factor that recycles the 60S export adapter NMD3, resolving why its loss blocks pre-60S nuclear export.","evidence":"Genetic epistasis, NMD3-overexpression suppression and Nmd3-GFP shuttling assays in yeast lsg1 mutants","pmids":["15660131"],"confidence":"High","gaps":["Did not show the structural basis of NMD3 release","GTP hydrolysis cycle not directly measured"]},{"year":2005,"claim":"Connected NMD3 release to ribosomal protein loading by showing a GTPase-dead Lsg1p traps the Rpl10p chaperone Sqt1p and a defective Rpl10p, implying uL16 loading is part of the release mechanism.","evidence":"Co-IP with a dominant-negative Walker A LSG1 mutant plus genetic suppression in yeast","pmids":["15831484"],"confidence":"Medium","gaps":["Order of uL16 loading versus NMD3 release not resolved","Relies on a trapping mutant rather than wild-type kinetics"]},{"year":2005,"claim":"Extended the factor to humans, showing hLSG1 is essential and predominantly ER-localized, raising the question of an ER-associated role distinct from ribosome biogenesis.","evidence":"siRNA essentiality and subcellular imaging in human cells","pmids":["16209721"],"confidence":"Medium","gaps":["Mechanism of ER targeting unknown","Functional meaning of ER localization not addressed"]},{"year":2005,"claim":"Placed LSG1 physically within a cytoplasmic pre-60S maturation complex by detecting association with TIF6 and the ABC protein ARB1.","evidence":"In vivo co-immunoprecipitation during ARB1 characterization in yeast","pmids":["16260602"],"confidence":"Low","gaps":["Single co-IP without reciprocal validation","Direct versus indirect association not distinguished"]},{"year":2007,"claim":"Defined a specific structural element of Rpl10p required for the release reaction, showing the central loop has a dynamic rather than purely structural role in Lsg1-dependent NMD3 release.","evidence":"Mutational analysis of the Rpl10p central loop with Nmd3 release assays in yeast","pmids":["17761675"],"confidence":"Medium","gaps":["Loop conformational dynamics not directly observed","Coupling to Lsg1 GTP hydrolysis not measured"]},{"year":2013,"claim":"Confirmed the GTPase activity and conserved adapter-release function in a metazoan ortholog, linking LSG1 activity to sustained ribosome production and translation.","evidence":"Genetic loss-of-function and biochemical GTPase assay on Drosophila NS3","pmids":["23436180"],"confidence":"Medium","gaps":["Substrate-stimulated kinetics not characterized","Ortholog inference for human mechanism"]},{"year":2017,"claim":"Provided the structural snapshot of the LSG1 reaction, localizing Lsg1 and Nmd3 near the PTC on a late pre-60S intermediate lacking key r-proteins including uL16.","evidence":"Cryo-EM of Nmd3-purified yeast pre-60S particles","pmids":["28112732"],"confidence":"High","gaps":["Lsg1 caught in a single state, not the catalytic cycle","Trigger for GTP hydrolysis not resolved structurally"]},{"year":2018,"claim":"Revealed a non-ribosomal cytoplasmic role for the ortholog in retaining the cell-cycle repressor Prospero, mapping required GTP-binding and acidic domains.","evidence":"Genetic screen, domain structure-function and imaging of Drosophila NS3 in neuroblasts","pmids":["29679561"],"confidence":"Medium","gaps":["Whether this reflects a moonlighting function or an indirect ribosome-biogenesis consequence is unresolved","Mammalian relevance untested"]},{"year":2019,"claim":"Showed that human LSG1 loss causes senescence through ER stress and cholesterol-pathway upregulation rather than translational insufficiency, decoupling the human phenotype from ribosome depletion.","evidence":"LSG1 inhibition with transcriptomic, pathway and senescence assays in human cells","pmids":["31148378"],"confidence":"Medium","gaps":["Direct molecular link between LSG1 and cholesterol genes not defined","Whether ER stress is cause or consequence unclear"]},{"year":2020,"claim":"Quantified LSG1 enzymology, establishing intrinsic GTPase parameters and showing the Nmd3·60S particle stabilizes GTP binding, acting as a substrate-coupled activating factor.","evidence":"Fluorescence nucleotide-binding and steady-state kinetic GTPase assays with recombinant yeast Lsg1","pmids":["32916301"],"confidence":"Medium","gaps":["GAP residues/mechanism of stimulation not mapped","Single in vitro study"]},{"year":2024,"claim":"Defined the molecular basis of ER targeting and proved it is separable from catalysis: human LSG1 binds VAPs via a noncanonical FFAT-like motif whose deletion blocks ER localization but not NMD3 recycling or GTPase activity.","evidence":"Co-IP, FFAT-motif deletion mutagenesis, imaging and in vitro GTPase assay in human cells","pmids":["39133101"],"confidence":"High","gaps":["Functional purpose of ER tethering not established","Link between ER localization and the senescence phenotype not demonstrated"]},{"year":2026,"claim":"Genetically embedded LSG1 in a broader cytoplasmic assembly pathway, with bypass suppressor mutations reversing the eL24 loading defect of rei1Δ reh1Δ particles.","evidence":"Bypass suppressor screen with ribosomal protein composition analysis in yeast (preprint)","pmids":["41959095"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Mechanistic relationship between Lsg1 and eL24 loading not biochemically defined"]},{"year":null,"claim":"How LSG1's two activities — NMD3 recycling at the PTC and VAP-mediated ER tethering — are integrated, and how ER residence drives the cholesterol/senescence phenotype, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism linking ER localization to ribosome maturation","Direct cause of cholesterol pathway upregulation unknown","No structure of the human LSG1-VAP complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,6,9,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,4]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,7]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[5,11]}],"complexes":["cytoplasmic pre-60S ribosomal maturation particle"],"partners":["NMD3","RPL10","SQT1","TIF6","ARB1","VAPA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H089","full_name":"Large subunit GTPase 1 homolog","aliases":[],"length_aa":658,"mass_kda":75.2,"function":"Functions as a GTPase (PubMed:16209721). May act by mediating the release of NMD3 from the 60S ribosomal subunit after export into the cytoplasm during the 60S ribosomal subunit maturation (PubMed:31148378)","subcellular_location":"Cytoplasm; Endoplasmic reticulum; Nucleus, Cajal body","url":"https://www.uniprot.org/uniprotkb/Q9H089/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/LSG1","classification":"Common Essential","n_dependent_lines":1161,"n_total_lines":1208,"dependency_fraction":0.9610927152317881},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DRG1","stoichiometry":0.2},{"gene":"HMGB2","stoichiometry":0.2},{"gene":"METAP2","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2},{"gene":"RBM8A","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2},{"gene":"SRP19","stoichiometry":0.2},{"gene":"SRP68","stoichiometry":0.2},{"gene":"SRP72","stoichiometry":0.2},{"gene":"SRP9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LSG1","total_profiled":1310},"omim":[{"mim_id":"610780","title":"LARGE 60S SUBUNIT NUCLEAR EXPORT GTPase 1; LSG1","url":"https://www.omim.org/entry/610780"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear bodies","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LSG1"},"hgnc":{"alias_symbol":["FLJ11301"],"prev_symbol":[]},"alphafold":{"accession":"Q9H089","domains":[{"cath_id":"3.40.50.300","chopping":"59-70_92-247_358-438","consensus_level":"medium","plddt":87.7082,"start":59,"end":438},{"cath_id":"1.10.1580.10","chopping":"451-582","consensus_level":"high","plddt":85.3894,"start":451,"end":582}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H089","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H089-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H089-F1-predicted_aligned_error_v6.png","plddt_mean":69.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LSG1","jax_strain_url":"https://www.jax.org/strain/search?query=LSG1"},"sequence":{"accession":"Q9H089","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H089.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H089/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H089"}},"corpus_meta":[{"pmid":"15660131","id":"PMC_15660131","title":"Release of the export adapter, Nmd3p, from the 60S ribosomal subunit requires Rpl10p and the cytoplasmic GTPase Lsg1p.","date":"2005","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/15660131","citation_count":150,"is_preprint":false},{"pmid":"15831484","id":"PMC_15831484","title":"Defining the order in which Nmd3p and Rpl10p load onto nascent 60S ribosomal subunits.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15831484","citation_count":110,"is_preprint":false},{"pmid":"28112732","id":"PMC_28112732","title":"Structural snapshot of cytoplasmic pre-60S ribosomal particles bound by Nmd3, Lsg1, Tif6 and Reh1.","date":"2017","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/28112732","citation_count":83,"is_preprint":false},{"pmid":"35036065","id":"PMC_35036065","title":"METTL14-mediated Lnc-LSG1 m6A modification inhibits clear cell renal cell carcinoma metastasis via regulating ESRP2 ubiquitination.","date":"2021","source":"Molecular therapy. 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Mutations in LSG1 blocked Nmd3-GFP shuttling into the nucleus and pre-60S export from the nucleus; overexpression of NMD3 alleviated the export defect, indicating the block in 60S export in lsg1 mutants results indirectly from failing to recycle Nmd3p.\",\n      \"method\": \"Genetic epistasis (lsg1 mutants, NMD3 overexpression suppression), Nmd3-GFP shuttling assays, in vitro binding assays with mutant Nmd3 proteins\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and cell biological methods, suppression analysis, in vitro binding; replicated in companion paper same year\",\n      \"pmids\": [\"15660131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A dominant Walker A motif mutation in Lsg1p traps Sqt1p (an Rpl10p chaperone/loading factor) in complexes co-immunoprecipitated with Lsg1p and Nmd3p, and also traps a mutant Rpl10p that does not normally bind stably to the subunit. This supports a model in which Sqt1p loads Rpl10p onto the Nmd3p-bound subunit after nuclear export, involving the GTPase activity of Lsg1p.\",\n      \"method\": \"Co-immunoprecipitation with dominant-negative Walker A LSG1 mutant, genetic suppression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with dominant-negative mutant and genetic suppression, single lab, two orthogonal methods\",\n      \"pmids\": [\"15831484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human LSG1 (hLsg1) is an essential GTPase predominantly localized to the endoplasmic reticulum and, in some cells, to Cajal bodies in the nucleus, as determined by siRNA knockdown (essential) and localization studies.\",\n      \"method\": \"siRNA knockdown (essentiality), subcellular localization by imaging\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization by imaging and siRNA essentiality, single lab, two methods but no deep functional mechanism\",\n      \"pmids\": [\"16209721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"LSG1 physically associates in vivo with TIF6 and ARB1 (an ABC protein involved in ribosome biogenesis), placing LSG1 in a cytoplasmic pre-60S maturation complex.\",\n      \"method\": \"Co-immunoprecipitation / physical association in vivo\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP result in the context of characterizing ARB1, single lab\",\n      \"pmids\": [\"16260602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mutations in the central loop (amino acids 102-112) of Rpl10p significantly impair the release of Nmd3p, demonstrating that this loop—though not required for stable ribosome binding—plays a dynamic role in the Lsg1-dependent Nmd3 release mechanism.\",\n      \"method\": \"Mutational analysis of Rpl10, Nmd3 release assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with functional release assay, single lab, multiple mutants tested\",\n      \"pmids\": [\"17761675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structural analysis of yeast pre-60S particles purified via Nmd3 revealed that Lsg1 and Nmd3 co-occupy a specific late cytoplasmic pre-60S intermediate in which ribosomal proteins uL16, uL10, uL11, eL40, and eL41 are absent. Lsg1 and Nmd3 are located near the peptidyl-transferase center (PTC), and Nmd3 recognizes the PTC in its near-mature conformation.\",\n      \"method\": \"Cryo-electron microscopy (cryo-EM) structural determination\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with direct localization of Lsg1 on pre-60S particle, providing mechanistic context for assembly checkpoint\",\n      \"pmids\": [\"28112732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Drosophila NS3 (Nucleostemin 3), the functional ortholog of yeast and human Lsg1, possesses GTPase activity demonstrated biochemically, and is required for release of the nuclear export adapter from the large ribosomal subunit, thereby enabling sustained ribosome production and translation.\",\n      \"method\": \"Genetic (null alleles, RNAi, hypomorphic allele) and biochemical (GTPase assay)\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical GTPase assay combined with genetic loss-of-function, single lab, ortholog study in Drosophila\",\n      \"pmids\": [\"23436180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Drosophila NS3 (Lsg1 ortholog) is cytoplasmic and required to retain the cell cycle repressor Prospero in the neuroblast cytoplasm via a Ran-independent pathway; the GTP-binding domain and acidic domain are required for NS3 function in neuroblast proliferation and cell polarity.\",\n      \"method\": \"Genetic screen, structure-function analysis (domain deletion/mutation), subcellular localization by imaging\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structure-function with genetic loss-of-function and localization, single lab, ortholog in Drosophila\",\n      \"pmids\": [\"29679561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Inhibition of LSG1 in human cells induces cellular senescence not through ribosome depletion or translational insufficiency, but through perturbation of endoplasmic reticulum homeostasis and dramatic upregulation of the cholesterol biosynthesis pathway.\",\n      \"method\": \"LSG1 inhibition (knockdown/small molecule), transcriptomic analysis, functional senescence assays, pathway analysis\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with specific phenotypic and pathway readouts, mechanistic exclusion of alternative explanations, single lab\",\n      \"pmids\": [\"31148378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Recombinant yeast Lsg1 has intrinsic GTPase activity (kcat ~1 min⁻¹, Km ~34 μM for GTP). Lsg1 has greater affinity for GTP than GDP. In the presence of 60S subunits loaded with Nmd3, affinity for both nucleotides increases, especially for GTP, suggesting the Nmd3•60S pre-ribosomal particle acts as a GTP Stabilizing Factor for Lsg1.\",\n      \"method\": \"Fluorescence spectroscopy (nucleotide binding), steady-state kinetic GTPase assay with recombinant protein\",\n      \"journal\": \"Biochimica et biophysica acta. Proteins and proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with purified components and kinetic analysis, single lab, single study\",\n      \"pmids\": [\"32916301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Human LSG1 binds to VAPs (vesicle-associated membrane protein-associated proteins) via a noncanonical FFAT-like motif. Deletion of this motif specifically disrupts LSG1 localization to the ER without perturbing LSG1-dependent recycling of NMD3 or LSG1 GTPase activity in vitro, showing the ER localization function is separable from its ribosome assembly function.\",\n      \"method\": \"Co-immunoprecipitation, FFAT-motif deletion mutagenesis, subcellular localization imaging, in vitro GTPase assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (co-IP, mutagenesis, localization, in vitro GTPase assay), mechanistic separation of two functions, single lab\",\n      \"pmids\": [\"39133101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Bypass suppressor mutations in LSG1 partially reverse the eL24 loading defect of rei1Δ reh1Δ pre-60S particles, placing Lsg1 in a cytoplasmic assembly pathway that involves eL24 recruitment and is genetically connected to Rei1/Reh1 function.\",\n      \"method\": \"Suppressor screen (bypass suppressors of rei1Δ reh1Δ), ribosome protein composition analysis, genetic epistasis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic suppressor screen with biochemical validation of eL24 loading, preprint, single lab\",\n      \"pmids\": [\"41959095\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"LSG1 is a conserved circularly permuted GTPase that acts in the cytoplasm during late 60S ribosomal subunit biogenesis: after nuclear export of the pre-60S particle, LSG1 binds near the peptidyl-transferase center (together with NMD3) and uses its GTPase activity—stimulated by the NMD3•60S complex—to drive the release and nuclear recycling of the export adapter NMD3, a process that also requires loading of ribosomal protein uL16 (Rpl10p) by the chaperone Sqt1p; separately, human LSG1 binds VAPs on the ER membrane via a noncanonical FFAT-like motif, a localization function that is distinct from its NMD3-recycling activity, and LSG1 inhibition triggers ER stress and cholesterol pathway upregulation leading to cellular senescence.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LSG1 is a conserved circularly permuted GTPase that catalyzes a late, cytoplasmic step of large (60S) ribosomal subunit maturation by driving release and nuclear recycling of the export adapter NMD3 [#0]. In yeast, lsg1 mutants fail to recycle Nmd3p from cytoplasmic 60S subunits, which indirectly blocks pre-60S nuclear export, a defect suppressed by NMD3 overexpression [#0]. Cryo-EM places Lsg1 together with Nmd3 near the peptidyl-transferase center of a defined late pre-60S intermediate that still lacks uL16, uL10, uL11, eL40 and eL41, providing the structural context for the maturation checkpoint [#5]. NMD3 release is coupled to loading of ribosomal protein Rpl10p (uL16) by the chaperone Sqt1p, which a dominant Walker A Lsg1p mutant traps in complex with Lsg1p and Nmd3p, and depends on a dynamic central loop of Rpl10p [#1, #4]. Lsg1's intrinsic GTPase activity is stimulated by the Nmd3·60S particle, which acts as a GTP-stabilizing factor and links nucleotide turnover to substrate engagement [#9]. Separately, human LSG1 docks onto ER-membrane VAPs through a noncanonical FFAT-like motif; deletion of this motif abolishes ER localization without affecting NMD3 recycling or GTPase activity, establishing the ER-targeting role as functionally separable from ribosome assembly [#10]. Consistent with this, LSG1 inhibition in human cells induces senescence through perturbed ER homeostasis and upregulated cholesterol biosynthesis rather than translational insufficiency [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established the core function of LSG1: it is the cytoplasmic factor that recycles the 60S export adapter NMD3, resolving why its loss blocks pre-60S nuclear export.\",\n      \"evidence\": \"Genetic epistasis, NMD3-overexpression suppression and Nmd3-GFP shuttling assays in yeast lsg1 mutants\",\n      \"pmids\": [\"15660131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show the structural basis of NMD3 release\", \"GTP hydrolysis cycle not directly measured\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected NMD3 release to ribosomal protein loading by showing a GTPase-dead Lsg1p traps the Rpl10p chaperone Sqt1p and a defective Rpl10p, implying uL16 loading is part of the release mechanism.\",\n      \"evidence\": \"Co-IP with a dominant-negative Walker A LSG1 mutant plus genetic suppression in yeast\",\n      \"pmids\": [\"15831484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Order of uL16 loading versus NMD3 release not resolved\", \"Relies on a trapping mutant rather than wild-type kinetics\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended the factor to humans, showing hLSG1 is essential and predominantly ER-localized, raising the question of an ER-associated role distinct from ribosome biogenesis.\",\n      \"evidence\": \"siRNA essentiality and subcellular imaging in human cells\",\n      \"pmids\": [\"16209721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ER targeting unknown\", \"Functional meaning of ER localization not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed LSG1 physically within a cytoplasmic pre-60S maturation complex by detecting association with TIF6 and the ABC protein ARB1.\",\n      \"evidence\": \"In vivo co-immunoprecipitation during ARB1 characterization in yeast\",\n      \"pmids\": [\"16260602\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-IP without reciprocal validation\", \"Direct versus indirect association not distinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a specific structural element of Rpl10p required for the release reaction, showing the central loop has a dynamic rather than purely structural role in Lsg1-dependent NMD3 release.\",\n      \"evidence\": \"Mutational analysis of the Rpl10p central loop with Nmd3 release assays in yeast\",\n      \"pmids\": [\"17761675\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Loop conformational dynamics not directly observed\", \"Coupling to Lsg1 GTP hydrolysis not measured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Confirmed the GTPase activity and conserved adapter-release function in a metazoan ortholog, linking LSG1 activity to sustained ribosome production and translation.\",\n      \"evidence\": \"Genetic loss-of-function and biochemical GTPase assay on Drosophila NS3\",\n      \"pmids\": [\"23436180\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate-stimulated kinetics not characterized\", \"Ortholog inference for human mechanism\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural snapshot of the LSG1 reaction, localizing Lsg1 and Nmd3 near the PTC on a late pre-60S intermediate lacking key r-proteins including uL16.\",\n      \"evidence\": \"Cryo-EM of Nmd3-purified yeast pre-60S particles\",\n      \"pmids\": [\"28112732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lsg1 caught in a single state, not the catalytic cycle\", \"Trigger for GTP hydrolysis not resolved structurally\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed a non-ribosomal cytoplasmic role for the ortholog in retaining the cell-cycle repressor Prospero, mapping required GTP-binding and acidic domains.\",\n      \"evidence\": \"Genetic screen, domain structure-function and imaging of Drosophila NS3 in neuroblasts\",\n      \"pmids\": [\"29679561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this reflects a moonlighting function or an indirect ribosome-biogenesis consequence is unresolved\", \"Mammalian relevance untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed that human LSG1 loss causes senescence through ER stress and cholesterol-pathway upregulation rather than translational insufficiency, decoupling the human phenotype from ribosome depletion.\",\n      \"evidence\": \"LSG1 inhibition with transcriptomic, pathway and senescence assays in human cells\",\n      \"pmids\": [\"31148378\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between LSG1 and cholesterol genes not defined\", \"Whether ER stress is cause or consequence unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Quantified LSG1 enzymology, establishing intrinsic GTPase parameters and showing the Nmd3·60S particle stabilizes GTP binding, acting as a substrate-coupled activating factor.\",\n      \"evidence\": \"Fluorescence nucleotide-binding and steady-state kinetic GTPase assays with recombinant yeast Lsg1\",\n      \"pmids\": [\"32916301\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GAP residues/mechanism of stimulation not mapped\", \"Single in vitro study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the molecular basis of ER targeting and proved it is separable from catalysis: human LSG1 binds VAPs via a noncanonical FFAT-like motif whose deletion blocks ER localization but not NMD3 recycling or GTPase activity.\",\n      \"evidence\": \"Co-IP, FFAT-motif deletion mutagenesis, imaging and in vitro GTPase assay in human cells\",\n      \"pmids\": [\"39133101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional purpose of ER tethering not established\", \"Link between ER localization and the senescence phenotype not demonstrated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Genetically embedded LSG1 in a broader cytoplasmic assembly pathway, with bypass suppressor mutations reversing the eL24 loading defect of rei1Δ reh1Δ particles.\",\n      \"evidence\": \"Bypass suppressor screen with ribosomal protein composition analysis in yeast (preprint)\",\n      \"pmids\": [\"41959095\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Mechanistic relationship between Lsg1 and eL24 loading not biochemically defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LSG1's two activities — NMD3 recycling at the PTC and VAP-mediated ER tethering — are integrated, and how ER residence drives the cholesterol/senescence phenotype, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism linking ER localization to ribosome maturation\", \"Direct cause of cholesterol pathway upregulation unknown\", \"No structure of the human LSG1-VAP complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 6, 9, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [5, 11]}\n    ],\n    \"complexes\": [\n      \"cytoplasmic pre-60S ribosomal maturation particle\"\n    ],\n    \"partners\": [\n      \"NMD3\",\n      \"RPL10\",\n      \"SQT1\",\n      \"TIF6\",\n      \"ARB1\",\n      \"VAPA\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}