{"gene":"ADSS2","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2000,"finding":"Electrical pacing of cardiomyocytes activates the calcineurin/NFAT3 pathway, leading to NFAT3 dephosphorylation and nuclear translocation, directly activating the muscle-specific Adss1 gene; the nonmuscle Adss2 isoform is repressed under these conditions. An NFAT binding site in the Adss1 5'-flanking region is essential for this activation. GATA4 synthesis and MEF2C also contribute to Adss1 transactivation.","method":"Electrical pacing of cultured cardiomyocytes, mutational studies of NFAT binding site, reporter gene assays, calcineurin pathway inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — defined cellular phenotype with multiple orthogonal methods (mutational analysis, reporter assays, pathway inhibition), single lab but rigorous mechanistic dissection","pmids":["10636885"],"is_preprint":false},{"year":2015,"finding":"ADSS (adenylosuccinate synthase) catalyzes production of adenylosuccinate (S-AMP) from IMP in pancreatic β cells in response to glucose. Inhibition of ADSS lowers S-AMP levels and impairs glucose-stimulated insulin secretion (GSIS). Addition of S-AMP to patch-clamped human β cells amplifies exocytosis in a SENP1-dependent manner.","method":"Metabolomics profiling, ADSS inhibitor treatment, patch-clamp electrophysiology with S-AMP addition, siRNA knockdown","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (metabolomics, pharmacological inhibition, direct patch-clamp addition, siRNA), single lab","pmids":["26411681"],"is_preprint":false},{"year":2015,"finding":"ADSS (adenylosuccinate synthase) is a component of the purinosome complex in HeLa cells. Purinosome assembly under purine-depleted conditions is associated with increased IMP concentration and elevated de novo IMP/AMP/GMP biosynthetic flux, demonstrating that purinosome assembly is functionally linked to activated de novo purine biosynthesis.","method":"Metabolomics (quantification of purine nucleotides), fluorescence microscopy for purinosome assembly, isotopic labeling for flux measurements","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal metabolomic methods, but ADSS's specific role within the purinosome is inferred from membership rather than direct functional dissection of its purinosome contribution","pmids":["25605736"],"is_preprint":false},{"year":2020,"finding":"ADSS is a substrate of the CUL3-KCTD13 ubiquitin ligase complex in neurons. In Kctd13 mutant neurons, ADSS ubiquitination is reduced, leading to elevated levels of succinyl-adenosine (S-Ado). Treatment with an ADSS inhibitor decreased elevated S-Ado levels in Kctd13 mutant neurons.","method":"Ubiquitylome comparison of Kctd13 mutant vs. wild-type neurons (mass spectrometry), metabolite quantification of S-Ado, ADSS inhibitor treatment, functional analysis of human KCTD13 variants","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitylome MS identifying ADSS as substrate plus inhibitor rescue, single lab with two complementary methods","pmids":["33409479"],"is_preprint":false},{"year":1989,"finding":"The muscle isozyme of adenylosuccinate synthetase (AdSS) binds to F-actin, actin-tropomyosin complexes, reconstructed thin filaments, and myofibrils (but not myosin) at physiological ionic strength and pH. The apparent dissociation constant is 1.2 µM with a binding maximum of 2.6 nmol enzyme/mg myofibrils, suggesting physiologically significant association with the thin filament in muscle.","method":"Binding assay of purified AdSS with purified contractile proteins under physiological conditions; measurement of apparent Kd and binding maximum","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding assay with purified components at physiological conditions, quantitative Kd measurement, single lab","pmids":["2750889"],"is_preprint":false},{"year":1994,"finding":"Human ADSS gene maps to the long arm of chromosome 1 (region 1cen-1q12), established by complementation of the ADSS-deficient CHO mutant Ade-H with human chromosome 1 in somatic cell hybrids. Correction of the defect restores adenylosuccinate synthetase enzymatic activity and purine prototrophy.","method":"Somatic cell hybridization, cytogenetics, Southern blot analysis, biochemical enzyme activity assay, segregant analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple concordant methods (cytogenetics, segregant analysis, enzyme activity, Southern blot) in a single study establishing chromosomal location and function","pmids":["2004783"],"is_preprint":false},{"year":1994,"finding":"ADSS can function as a dominant amplifiable genetic marker in mammalian cells. Alanosine (an aspartic acid analog whose metabolite inhibits ADSS) can select for cells with high ADSS expression from transfectants, and stepwise alanosine selection results in highly amplified copies of transfected ADSS minigenes. Non-selectable genes can be cotransferred and coamplified with ADSS minigenes.","method":"Transfection and alanosine selection, gene amplification, enzyme activity assay, cotransformation","journal":"Somatic cell and molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional demonstration of alanosine inhibition mechanism and amplification phenotype, single lab","pmids":["7825060"],"is_preprint":false},{"year":2005,"finding":"Human AdSSL1 (muscle isozyme, equivalent to ADSS1) purified recombinant protein possesses typical enzymatic activity to catalyze adenylosuccinate formation (first committed step of AMP synthesis). When overexpressed in COS-7 cells, the protein localizes to the cytoplasm. The nonmuscle ADSS2 isoform has a different expression pattern and is not restricted to muscle.","method":"Recombinant protein expression and enzymatic assay, subcellular localization by overexpression in COS-7 cells, RT-PCR tissue distribution","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — enzymatic activity demonstrated in vitro and localization by overexpression, but single lab and limited mechanistic depth for ADSS2 specifically","pmids":["15786719"],"is_preprint":false},{"year":2007,"finding":"Porcine ADSS2 protein localizes to mitochondria (subcellular localization), in contrast to the muscle isozyme ADSS1. ADSS2 gene is mapped to porcine chromosome 10p. ADSS2 expression is broadly distributed across tissues and more constant during muscle development, while ADSS1 is striated-muscle specific and upregulated during muscle growth.","method":"Subcellular localization by fluorescence/overexpression assays, chromosome mapping by linkage analysis, RT-PCR tissue distribution","journal":"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-localization/overexpression experiment for subcellular localization, single lab, no functional consequence demonstrated for mitochondrial localization","pmids":["17347008"],"is_preprint":false},{"year":2013,"finding":"PPARγ directly binds to putative PPAR-responsive elements in the 5'-flanking region of the Adss gene (rat adenylosuccinate synthase), and thiazolidinedione treatment upregulates Adss expression, leading to altered purine nucleotide metabolism and AMP accumulation associated with cardiac hypertrophy.","method":"Chromatin immunoprecipitation (ChIP) assay confirming PPARγ binding to Adss promoter, quantitative RT-PCR, 1H NMR metabolomics, AMPK activation assay","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay directly confirming PPARγ-Adss promoter binding combined with metabolomic and kinase readouts, single lab","pmids":["24164426"],"is_preprint":false},{"year":2022,"finding":"Metformin treatment upregulates ADSS expression in skeletal muscle of fructose-fed insulin-resistant rats, which in conjunction with downregulation of AMPD1, increases AMP levels and the AMP/ATP ratio, thereby activating AMPK. This positions ADSS as a regulatory node in the purine nucleotide cycle controlling AMPK activation.","method":"Western blot and qPCR for ADSS and AMPD1 expression, AMP/ATP ratio measurement, AMPK phosphorylation assay in rat skeletal muscle","journal":"European journal of pharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, expression-level readouts without direct manipulation of ADSS to establish causality","pmids":["36058289"],"is_preprint":false},{"year":2019,"finding":"Proteomic analysis of LPS/IFN-γ-activated BV-2 microglial cells treated with pentagalloyl glucose (PGG) identified ADSS2 (adenylosuccinate synthetase isozyme 2) as significantly downregulated. This was confirmed at both protein and mRNA levels, linking ADSS2 expression to neuroinflammatory activation in microglia.","method":"Proteomic analysis (2D gel/MS), Western blot, quantitative RT-PCR confirmation","journal":"Molecular medicine reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — expression-level changes identified by proteomics with confirmation, but no direct mechanistic dissection of ADSS2 function in this context","pmids":["31257500"],"is_preprint":false},{"year":2025,"finding":"In pancreatic β cells, imeglimin increases adenylosuccinate (S-AMP) production via ADSS. Inhibition of ADSS reduces the ability of imeglimin to increase β-cell proliferation and ameliorate β-cell apoptosis in mouse, human, porcine islets, and human pluripotent stem cell-derived β cells, establishing ADSS-mediated S-AMP production as the mechanistic basis for imeglimin's proliferative and anti-apoptotic effects.","method":"ADSS inhibitor treatment in multiple islet models, β-cell proliferation and apoptosis assays, S-AMP quantification","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition of ADSS with defined β-cell phenotypic readouts replicated across multiple independent cell/islet systems","pmids":["40638403"],"is_preprint":false},{"year":2025,"finding":"NK1R activation by substance P in pancreatic acinar cells leads to β-arrestin1-mediated downregulation of Adss transcription (along with Adsl and Ampd), reducing fumarate levels and inhibiting mitochondrial function. Treatment with magnolol, identified as an NK1R inhibitor, restored purine nucleotide cycle enzyme expression and fumarate levels.","method":"NK1R activation/inhibition in acinar cells, gene expression (qPCR/RNA-seq), metabolite quantification (fumarate), β-arrestin1 pathway analysis","journal":"Acta pharmaceutica Sinica. B","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway-level description with limited direct mechanistic dissection of ADSS specifically; single lab","pmids":["40654355"],"is_preprint":false},{"year":2025,"finding":"In yeast (S. cerevisiae), deletion of ADE12 (encoding AdSS, the yeast ortholog) causes IMP accumulation, impaired cellular energy metabolism, dysregulation of nucleotide/carbohydrate/amino acid metabolism, cell division arrest, and elevated error-prone DNA polymerase ζ-dependent mutagenesis, connecting AdSS activity to genome stability.","method":"GC-MS metabolite profiling of ade12 mutants, growth/cell division assays, mutagenesis assays in yeast","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in model organism combined with metabolomics and mutagenesis readouts, multiple phenotypic measurements","pmids":["40331943"],"is_preprint":false},{"year":2082,"finding":"ADSS (adenylosuccinate synthase) and adenosine kinase (ADK) are critical for ribavirin nucleotide metabolism and bioactivation in lymphoma cells, as identified by genome-wide CRISPR-Cas9 dropout screening.","method":"Genome-wide CRISPR-Cas9 screen in Eµ-Myc; Arf-/- lymphoma cells with ribavirin treatment","journal":"Antiviral research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — CRISPR screen identifying ADSS as a hit for ribavirin bioactivation, but no direct mechanistic follow-up of ADSS function; single screen","pmids":["41260510"],"is_preprint":false},{"year":2025,"finding":"LEDGF binds H3R17me2a (via Asn38 and Asp57 of its PWWP domain) to promote transcription of purine nucleotide synthesis genes including ADSS2 in SETD2-mutant clear cell renal cell carcinoma. ADSS2 is identified as a key transcriptional target upregulated through this alternative epigenetic axis, promoting tumor proliferation.","method":"Peptide pull-down assays (Asn38/Asp57 mutants), in vitro and in vivo proliferation experiments, ChIP-seq/transcriptome analysis","journal":"Advanced science","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ADSS2 identified as downstream target gene, not directly studied for its own mechanism; pull-down validates LEDGF-H3R17me2a interaction, not ADSS2 function","pmids":["40548925"],"is_preprint":false}],"current_model":"ADSS2 (non-muscle adenylosuccinate synthetase 2) catalyzes the first committed step of AMP synthesis by converting IMP and aspartate to adenylosuccinate (S-AMP) in a GTP-dependent reaction; it is subject to transcriptional repression during cardiomyocyte electrical pacing (while the muscle isoform ADSS1 is activated via calcineurin/NFAT3/GATA4), is a substrate of the CUL3-KCTD13 ubiquitin ligase in neurons, associates with the purinosome complex to enhance de novo purine flux, generates S-AMP in pancreatic β cells that acts as an insulin secretagogue by amplifying exocytosis in a SENP1-dependent manner, and its enzymatic activity is linked to AMPK regulation through the purine nucleotide cycle in muscle."},"narrative":{"mechanistic_narrative":"ADSS2 (non-muscle adenylosuccinate synthetase 2) catalyzes the first committed step of de novo and salvage AMP synthesis, converting IMP and aspartate to adenylosuccinate (S-AMP), an activity demonstrated for the recombinant enzyme and shown to restore purine prototrophy when human chromosome 1 corrects an ADSS-deficient mutant [PMID:2004783, PMID:15786719]. Within cells this catalytic step is spatially organized: ADSS associates with the purinosome, a multienzyme assembly whose formation under purine depletion accompanies elevated IMP and increased de novo purine biosynthetic flux [PMID:25605736]. The S-AMP it produces functions beyond bulk nucleotide supply as a signaling metabolite — in pancreatic β cells glucose drives ADSS-dependent S-AMP production that amplifies insulin exocytosis in a SENP1-dependent manner, and this same ADSS/S-AMP axis underlies the proliferative and anti-apoptotic actions of the antidiabetic agent imeglimin [PMID:26411681, PMID:40638403]. ADSS2 is distinguished from its striated-muscle paralog ADSS1 by broad tissue expression and reciprocal transcriptional regulation: cardiomyocyte electrical pacing represses Adss2 while activating Adss1 through calcineurin/NFAT3/GATA4 [PMID:10636885]. ADSS expression is further controlled by transcriptional inputs including PPARγ binding to the Adss promoter, with thiazolidinedione treatment raising ADSS and shifting purine metabolism toward AMP accumulation [PMID:24164426]. The enzyme is also a substrate of the CUL3-KCTD13 ubiquitin ligase in neurons, where loss of ubiquitination elevates the downstream metabolite succinyl-adenosine [PMID:33409479]. Through its position in the purine nucleotide cycle, ADSS activity influences cellular AMP/ATP balance and AMPK regulation [PMID:24164426, PMID:36058289].","teleology":[{"year":1989,"claim":"Established that adenylosuccinate synthetase is not merely a soluble metabolic enzyme but physically associates with the contractile apparatus, raising the possibility of spatial organization of purine metabolism in muscle.","evidence":"In vitro binding assays of purified muscle AdSS with F-actin, thin filaments, and myofibrils under physiological conditions","pmids":["2750889"],"confidence":"Medium","gaps":["Concerns the muscle isozyme rather than ADSS2 specifically","Functional consequence of thin-filament association not demonstrated"]},{"year":1994,"claim":"Localized the human ADSS gene to chromosome 1 and confirmed that the gene product carries adenylosuccinate synthetase activity by rescuing a purine-auxotrophic mutant.","evidence":"Somatic cell hybridization, segregant analysis, and enzyme activity assays complementing the ADSS-deficient CHO mutant","pmids":["2004783"],"confidence":"Medium","gaps":["Does not distinguish ADSS2 from the muscle isoform at the activity level","No structural detail of the enzyme"]},{"year":2000,"claim":"Defined the reciprocal transcriptional logic separating the two isozymes, showing that contractile/calcium signaling activates the muscle isoform while repressing the non-muscle ADSS2 isoform.","evidence":"Electrical pacing of cardiomyocytes with NFAT-site mutagenesis, reporter assays, and calcineurin pathway inhibition","pmids":["10636885"],"confidence":"High","gaps":["Mechanism repressing Adss2 (versus activating Adss1) not dissected","Direct cis-elements controlling Adss2 not mapped"]},{"year":2005,"claim":"Demonstrated the recombinant enzyme's catalytic activity and cytoplasmic localization, and noted ADSS2's broad, non-muscle-restricted expression pattern.","evidence":"Recombinant enzymatic assay, COS-7 overexpression localization, RT-PCR tissue distribution","pmids":["15786719"],"confidence":"Medium","gaps":["Most enzymatic characterization is on the muscle isozyme; ADSS2-specific kinetics limited","Localization inferred from overexpression"]},{"year":2013,"claim":"Identified a transcriptional input (PPARγ) regulating Adss and linked altered Adss expression to AMP accumulation and AMPK signaling, embedding the enzyme in metabolic stress regulation.","evidence":"ChIP confirming PPARγ binding to the Adss promoter, qRT-PCR, NMR metabolomics, AMPK activation assays in rat cardiac tissue","pmids":["24164426"],"confidence":"Medium","gaps":["Isoform specificity of the PPARγ-regulated Adss not resolved","Causality between ADSS level and AMPK not established by direct ADSS manipulation"]},{"year":2015,"claim":"Recast ADSS-generated S-AMP as a signaling metabolite rather than a metabolic intermediate, showing it amplifies β-cell insulin exocytosis through SENP1.","evidence":"Metabolomics, pharmacological ADSS inhibition, siRNA, and patch-clamp electrophysiology with direct S-AMP addition to human β cells","pmids":["26411681"],"confidence":"High","gaps":["Molecular target of S-AMP downstream of SENP1 not identified","Whether ADSS1 or ADSS2 supplies the relevant S-AMP not resolved"]},{"year":2015,"claim":"Placed ADSS within the purinosome and linked the assembly of this multienzyme body to upregulated de novo purine flux, suggesting spatial channeling of the AMP-branch reaction.","evidence":"Fluorescence microscopy of purinosome assembly, purine nucleotide metabolomics, isotopic flux measurements in HeLa cells","pmids":["25605736"],"confidence":"Medium","gaps":["ADSS's specific contribution inferred from membership, not direct functional dissection within the complex","Binding partners that recruit ADSS unidentified"]},{"year":2020,"claim":"Identified post-translational control of ADSS, establishing it as a CUL3-KCTD13 ubiquitin ligase substrate whose dysregulation alters purine-derived metabolite levels in neurons.","evidence":"Ubiquitylome MS comparison of Kctd13 mutant vs wild-type neurons, S-Ado metabolite quantification, ADSS inhibitor rescue","pmids":["33409479"],"confidence":"Medium","gaps":["Ubiquitination site and consequence (degradation vs activity) not defined","Direct ADSS-KCTD13 binding not reciprocally validated"]},{"year":2022,"claim":"Positioned ADSS as a regulatory node in the purine nucleotide cycle controlling AMPK activation in insulin-resistant muscle.","evidence":"Metformin treatment of fructose-fed rats with Western blot/qPCR for ADSS and AMPD1, AMP/ATP ratio and AMPK phosphorylation assays","pmids":["36058289"],"confidence":"Low","gaps":["Expression-level correlation without direct ADSS manipulation to establish causality","Isoform contributing to the muscle effect not specified"]},{"year":2025,"claim":"Extended the β-cell S-AMP signaling model to drug action, showing ADSS-mediated S-AMP production is the mechanistic basis for imeglimin's proliferative and anti-apoptotic effects.","evidence":"ADSS pharmacological inhibition across mouse, human, porcine islets and stem-cell-derived β cells with proliferation/apoptosis assays and S-AMP quantification","pmids":["40638403"],"confidence":"Medium","gaps":["Downstream effectors of S-AMP in proliferation/apoptosis not mapped","Inhibitor selectivity between ADSS isoforms not addressed"]},{"year":2025,"claim":"Connected loss of AdSS activity to genome instability, showing IMP accumulation upon ortholog deletion drives error-prone DNA polymerase ζ-dependent mutagenesis.","evidence":"GC-MS metabolite profiling, growth/division, and mutagenesis assays in S. cerevisiae ade12 mutants","pmids":["40331943"],"confidence":"Medium","gaps":["Demonstrated in yeast ortholog; relevance to human ADSS2 not tested","Mechanism linking IMP buildup to polymerase ζ recruitment unknown"]},{"year":null,"claim":"It remains unresolved which functions are isoform-specific to ADSS2 versus shared with ADSS1, how S-AMP is sensed downstream, and what governs ADSS2 recruitment to the purinosome.","evidence":"No timeline discovery resolves these questions","pmids":[],"confidence":"Low","gaps":["No structural model of human ADSS2","Downstream S-AMP receptor/effector unidentified","Purinosome recruitment determinants for ADSS2 unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[5,7]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[5,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2]}],"complexes":["purinosome"],"partners":["KCTD13","CUL3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30520","full_name":"Adenylosuccinate synthetase isozyme 2","aliases":["Adenylosuccinate synthetase, acidic isozyme","Adenylosuccinate synthetase, liver isozyme","L-type adenylosuccinate synthetase","IMP--aspartate ligase 2"],"length_aa":456,"mass_kda":50.1,"function":"Plays an important role in the de novo pathway and in the salvage pathway of purine nucleotide biosynthesis. Catalyzes the first committed step in the biosynthesis of AMP from IMP","subcellular_location":"Cytoplasm; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P30520/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADSS2","classification":"Not Classified","n_dependent_lines":546,"n_total_lines":1208,"dependency_fraction":0.4519867549668874},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADSS2","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ADSS2"},"hgnc":{"alias_symbol":[],"prev_symbol":["ADSS"]},"alphafold":{"accession":"P30520","domains":[{"cath_id":"3.40.440.10","chopping":"29-130_231-291","consensus_level":"medium","plddt":94.9219,"start":29,"end":291},{"cath_id":"1.10.300.10","chopping":"134-227","consensus_level":"high","plddt":94.5118,"start":134,"end":227},{"cath_id":"3.90.170.10","chopping":"297-453","consensus_level":"medium","plddt":95.4027,"start":297,"end":453}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30520","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30520-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30520-F1-predicted_aligned_error_v6.png","plddt_mean":92.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADSS2","jax_strain_url":"https://www.jax.org/strain/search?query=ADSS2"},"sequence":{"accession":"P30520","fasta_url":"https://rest.uniprot.org/uniprotkb/P30520.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30520/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30520"}},"corpus_meta":[{"pmid":"9109749","id":"PMC_9109749","title":"Effects 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Synthetase.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40331943","citation_count":0,"is_preprint":false},{"pmid":"40692551","id":"PMC_40692551","title":"Dietary supplementation with glutamate improves the flesh quality of gibel carp (Carassius gibelio) by altering muscle texture characteristics and increasing the deposition of flavour substances.","date":"2025","source":"Journal of nutritional science","url":"https://pubmed.ncbi.nlm.nih.gov/40692551","citation_count":0,"is_preprint":false},{"pmid":"40522167","id":"PMC_40522167","title":"Brain Adenylosuccinate Is Dramatically Increased Under Global Ischemia Without Evidence for Purine Nucleotide Cycle Activation.","date":"2025","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/40522167","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.13.642734","title":"Bacteriophage protein Dap2 inhibits bacterial type III 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An NFAT binding site in the Adss1 5'-flanking region is essential for this activation. GATA4 synthesis and MEF2C also contribute to Adss1 transactivation.\",\n      \"method\": \"Electrical pacing of cultured cardiomyocytes, mutational studies of NFAT binding site, reporter gene assays, calcineurin pathway inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular phenotype with multiple orthogonal methods (mutational analysis, reporter assays, pathway inhibition), single lab but rigorous mechanistic dissection\",\n      \"pmids\": [\"10636885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ADSS (adenylosuccinate synthase) catalyzes production of adenylosuccinate (S-AMP) from IMP in pancreatic β cells in response to glucose. Inhibition of ADSS lowers S-AMP levels and impairs glucose-stimulated insulin secretion (GSIS). Addition of S-AMP to patch-clamped human β cells amplifies exocytosis in a SENP1-dependent manner.\",\n      \"method\": \"Metabolomics profiling, ADSS inhibitor treatment, patch-clamp electrophysiology with S-AMP addition, siRNA knockdown\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (metabolomics, pharmacological inhibition, direct patch-clamp addition, siRNA), single lab\",\n      \"pmids\": [\"26411681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ADSS (adenylosuccinate synthase) is a component of the purinosome complex in HeLa cells. Purinosome assembly under purine-depleted conditions is associated with increased IMP concentration and elevated de novo IMP/AMP/GMP biosynthetic flux, demonstrating that purinosome assembly is functionally linked to activated de novo purine biosynthesis.\",\n      \"method\": \"Metabolomics (quantification of purine nucleotides), fluorescence microscopy for purinosome assembly, isotopic labeling for flux measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal metabolomic methods, but ADSS's specific role within the purinosome is inferred from membership rather than direct functional dissection of its purinosome contribution\",\n      \"pmids\": [\"25605736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ADSS is a substrate of the CUL3-KCTD13 ubiquitin ligase complex in neurons. In Kctd13 mutant neurons, ADSS ubiquitination is reduced, leading to elevated levels of succinyl-adenosine (S-Ado). Treatment with an ADSS inhibitor decreased elevated S-Ado levels in Kctd13 mutant neurons.\",\n      \"method\": \"Ubiquitylome comparison of Kctd13 mutant vs. wild-type neurons (mass spectrometry), metabolite quantification of S-Ado, ADSS inhibitor treatment, functional analysis of human KCTD13 variants\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitylome MS identifying ADSS as substrate plus inhibitor rescue, single lab with two complementary methods\",\n      \"pmids\": [\"33409479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"The muscle isozyme of adenylosuccinate synthetase (AdSS) binds to F-actin, actin-tropomyosin complexes, reconstructed thin filaments, and myofibrils (but not myosin) at physiological ionic strength and pH. The apparent dissociation constant is 1.2 µM with a binding maximum of 2.6 nmol enzyme/mg myofibrils, suggesting physiologically significant association with the thin filament in muscle.\",\n      \"method\": \"Binding assay of purified AdSS with purified contractile proteins under physiological conditions; measurement of apparent Kd and binding maximum\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding assay with purified components at physiological conditions, quantitative Kd measurement, single lab\",\n      \"pmids\": [\"2750889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Human ADSS gene maps to the long arm of chromosome 1 (region 1cen-1q12), established by complementation of the ADSS-deficient CHO mutant Ade-H with human chromosome 1 in somatic cell hybrids. Correction of the defect restores adenylosuccinate synthetase enzymatic activity and purine prototrophy.\",\n      \"method\": \"Somatic cell hybridization, cytogenetics, Southern blot analysis, biochemical enzyme activity assay, segregant analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple concordant methods (cytogenetics, segregant analysis, enzyme activity, Southern blot) in a single study establishing chromosomal location and function\",\n      \"pmids\": [\"2004783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"ADSS can function as a dominant amplifiable genetic marker in mammalian cells. Alanosine (an aspartic acid analog whose metabolite inhibits ADSS) can select for cells with high ADSS expression from transfectants, and stepwise alanosine selection results in highly amplified copies of transfected ADSS minigenes. Non-selectable genes can be cotransferred and coamplified with ADSS minigenes.\",\n      \"method\": \"Transfection and alanosine selection, gene amplification, enzyme activity assay, cotransformation\",\n      \"journal\": \"Somatic cell and molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional demonstration of alanosine inhibition mechanism and amplification phenotype, single lab\",\n      \"pmids\": [\"7825060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human AdSSL1 (muscle isozyme, equivalent to ADSS1) purified recombinant protein possesses typical enzymatic activity to catalyze adenylosuccinate formation (first committed step of AMP synthesis). When overexpressed in COS-7 cells, the protein localizes to the cytoplasm. The nonmuscle ADSS2 isoform has a different expression pattern and is not restricted to muscle.\",\n      \"method\": \"Recombinant protein expression and enzymatic assay, subcellular localization by overexpression in COS-7 cells, RT-PCR tissue distribution\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — enzymatic activity demonstrated in vitro and localization by overexpression, but single lab and limited mechanistic depth for ADSS2 specifically\",\n      \"pmids\": [\"15786719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Porcine ADSS2 protein localizes to mitochondria (subcellular localization), in contrast to the muscle isozyme ADSS1. ADSS2 gene is mapped to porcine chromosome 10p. ADSS2 expression is broadly distributed across tissues and more constant during muscle development, while ADSS1 is striated-muscle specific and upregulated during muscle growth.\",\n      \"method\": \"Subcellular localization by fluorescence/overexpression assays, chromosome mapping by linkage analysis, RT-PCR tissue distribution\",\n      \"journal\": \"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-localization/overexpression experiment for subcellular localization, single lab, no functional consequence demonstrated for mitochondrial localization\",\n      \"pmids\": [\"17347008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PPARγ directly binds to putative PPAR-responsive elements in the 5'-flanking region of the Adss gene (rat adenylosuccinate synthase), and thiazolidinedione treatment upregulates Adss expression, leading to altered purine nucleotide metabolism and AMP accumulation associated with cardiac hypertrophy.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay confirming PPARγ binding to Adss promoter, quantitative RT-PCR, 1H NMR metabolomics, AMPK activation assay\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay directly confirming PPARγ-Adss promoter binding combined with metabolomic and kinase readouts, single lab\",\n      \"pmids\": [\"24164426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Metformin treatment upregulates ADSS expression in skeletal muscle of fructose-fed insulin-resistant rats, which in conjunction with downregulation of AMPD1, increases AMP levels and the AMP/ATP ratio, thereby activating AMPK. This positions ADSS as a regulatory node in the purine nucleotide cycle controlling AMPK activation.\",\n      \"method\": \"Western blot and qPCR for ADSS and AMPD1 expression, AMP/ATP ratio measurement, AMPK phosphorylation assay in rat skeletal muscle\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, expression-level readouts without direct manipulation of ADSS to establish causality\",\n      \"pmids\": [\"36058289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Proteomic analysis of LPS/IFN-γ-activated BV-2 microglial cells treated with pentagalloyl glucose (PGG) identified ADSS2 (adenylosuccinate synthetase isozyme 2) as significantly downregulated. This was confirmed at both protein and mRNA levels, linking ADSS2 expression to neuroinflammatory activation in microglia.\",\n      \"method\": \"Proteomic analysis (2D gel/MS), Western blot, quantitative RT-PCR confirmation\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — expression-level changes identified by proteomics with confirmation, but no direct mechanistic dissection of ADSS2 function in this context\",\n      \"pmids\": [\"31257500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In pancreatic β cells, imeglimin increases adenylosuccinate (S-AMP) production via ADSS. Inhibition of ADSS reduces the ability of imeglimin to increase β-cell proliferation and ameliorate β-cell apoptosis in mouse, human, porcine islets, and human pluripotent stem cell-derived β cells, establishing ADSS-mediated S-AMP production as the mechanistic basis for imeglimin's proliferative and anti-apoptotic effects.\",\n      \"method\": \"ADSS inhibitor treatment in multiple islet models, β-cell proliferation and apoptosis assays, S-AMP quantification\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition of ADSS with defined β-cell phenotypic readouts replicated across multiple independent cell/islet systems\",\n      \"pmids\": [\"40638403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NK1R activation by substance P in pancreatic acinar cells leads to β-arrestin1-mediated downregulation of Adss transcription (along with Adsl and Ampd), reducing fumarate levels and inhibiting mitochondrial function. Treatment with magnolol, identified as an NK1R inhibitor, restored purine nucleotide cycle enzyme expression and fumarate levels.\",\n      \"method\": \"NK1R activation/inhibition in acinar cells, gene expression (qPCR/RNA-seq), metabolite quantification (fumarate), β-arrestin1 pathway analysis\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway-level description with limited direct mechanistic dissection of ADSS specifically; single lab\",\n      \"pmids\": [\"40654355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In yeast (S. cerevisiae), deletion of ADE12 (encoding AdSS, the yeast ortholog) causes IMP accumulation, impaired cellular energy metabolism, dysregulation of nucleotide/carbohydrate/amino acid metabolism, cell division arrest, and elevated error-prone DNA polymerase ζ-dependent mutagenesis, connecting AdSS activity to genome stability.\",\n      \"method\": \"GC-MS metabolite profiling of ade12 mutants, growth/cell division assays, mutagenesis assays in yeast\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in model organism combined with metabolomics and mutagenesis readouts, multiple phenotypic measurements\",\n      \"pmids\": [\"40331943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2082,\n      \"finding\": \"ADSS (adenylosuccinate synthase) and adenosine kinase (ADK) are critical for ribavirin nucleotide metabolism and bioactivation in lymphoma cells, as identified by genome-wide CRISPR-Cas9 dropout screening.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen in Eµ-Myc; Arf-/- lymphoma cells with ribavirin treatment\",\n      \"journal\": \"Antiviral research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — CRISPR screen identifying ADSS as a hit for ribavirin bioactivation, but no direct mechanistic follow-up of ADSS function; single screen\",\n      \"pmids\": [\"41260510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LEDGF binds H3R17me2a (via Asn38 and Asp57 of its PWWP domain) to promote transcription of purine nucleotide synthesis genes including ADSS2 in SETD2-mutant clear cell renal cell carcinoma. ADSS2 is identified as a key transcriptional target upregulated through this alternative epigenetic axis, promoting tumor proliferation.\",\n      \"method\": \"Peptide pull-down assays (Asn38/Asp57 mutants), in vitro and in vivo proliferation experiments, ChIP-seq/transcriptome analysis\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ADSS2 identified as downstream target gene, not directly studied for its own mechanism; pull-down validates LEDGF-H3R17me2a interaction, not ADSS2 function\",\n      \"pmids\": [\"40548925\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADSS2 (non-muscle adenylosuccinate synthetase 2) catalyzes the first committed step of AMP synthesis by converting IMP and aspartate to adenylosuccinate (S-AMP) in a GTP-dependent reaction; it is subject to transcriptional repression during cardiomyocyte electrical pacing (while the muscle isoform ADSS1 is activated via calcineurin/NFAT3/GATA4), is a substrate of the CUL3-KCTD13 ubiquitin ligase in neurons, associates with the purinosome complex to enhance de novo purine flux, generates S-AMP in pancreatic β cells that acts as an insulin secretagogue by amplifying exocytosis in a SENP1-dependent manner, and its enzymatic activity is linked to AMPK regulation through the purine nucleotide cycle in muscle.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ADSS2 (non-muscle adenylosuccinate synthetase 2) catalyzes the first committed step of de novo and salvage AMP synthesis, converting IMP and aspartate to adenylosuccinate (S-AMP), an activity demonstrated for the recombinant enzyme and shown to restore purine prototrophy when human chromosome 1 corrects an ADSS-deficient mutant [#5, #7]. Within cells this catalytic step is spatially organized: ADSS associates with the purinosome, a multienzyme assembly whose formation under purine depletion accompanies elevated IMP and increased de novo purine biosynthetic flux [#2]. The S-AMP it produces functions beyond bulk nucleotide supply as a signaling metabolite — in pancreatic β cells glucose drives ADSS-dependent S-AMP production that amplifies insulin exocytosis in a SENP1-dependent manner, and this same ADSS/S-AMP axis underlies the proliferative and anti-apoptotic actions of the antidiabetic agent imeglimin [#1, #12]. ADSS2 is distinguished from its striated-muscle paralog ADSS1 by broad tissue expression and reciprocal transcriptional regulation: cardiomyocyte electrical pacing represses Adss2 while activating Adss1 through calcineurin/NFAT3/GATA4 [#0]. ADSS expression is further controlled by transcriptional inputs including PPARγ binding to the Adss promoter, with thiazolidinedione treatment raising ADSS and shifting purine metabolism toward AMP accumulation [#9]. The enzyme is also a substrate of the CUL3-KCTD13 ubiquitin ligase in neurons, where loss of ubiquitination elevates the downstream metabolite succinyl-adenosine [#3]. Through its position in the purine nucleotide cycle, ADSS activity influences cellular AMP/ATP balance and AMPK regulation [#9, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Established that adenylosuccinate synthetase is not merely a soluble metabolic enzyme but physically associates with the contractile apparatus, raising the possibility of spatial organization of purine metabolism in muscle.\",\n      \"evidence\": \"In vitro binding assays of purified muscle AdSS with F-actin, thin filaments, and myofibrils under physiological conditions\",\n      \"pmids\": [\"2750889\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Concerns the muscle isozyme rather than ADSS2 specifically\", \"Functional consequence of thin-filament association not demonstrated\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Localized the human ADSS gene to chromosome 1 and confirmed that the gene product carries adenylosuccinate synthetase activity by rescuing a purine-auxotrophic mutant.\",\n      \"evidence\": \"Somatic cell hybridization, segregant analysis, and enzyme activity assays complementing the ADSS-deficient CHO mutant\",\n      \"pmids\": [\"2004783\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not distinguish ADSS2 from the muscle isoform at the activity level\", \"No structural detail of the enzyme\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the reciprocal transcriptional logic separating the two isozymes, showing that contractile/calcium signaling activates the muscle isoform while repressing the non-muscle ADSS2 isoform.\",\n      \"evidence\": \"Electrical pacing of cardiomyocytes with NFAT-site mutagenesis, reporter assays, and calcineurin pathway inhibition\",\n      \"pmids\": [\"10636885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism repressing Adss2 (versus activating Adss1) not dissected\", \"Direct cis-elements controlling Adss2 not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated the recombinant enzyme's catalytic activity and cytoplasmic localization, and noted ADSS2's broad, non-muscle-restricted expression pattern.\",\n      \"evidence\": \"Recombinant enzymatic assay, COS-7 overexpression localization, RT-PCR tissue distribution\",\n      \"pmids\": [\"15786719\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most enzymatic characterization is on the muscle isozyme; ADSS2-specific kinetics limited\", \"Localization inferred from overexpression\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified a transcriptional input (PPARγ) regulating Adss and linked altered Adss expression to AMP accumulation and AMPK signaling, embedding the enzyme in metabolic stress regulation.\",\n      \"evidence\": \"ChIP confirming PPARγ binding to the Adss promoter, qRT-PCR, NMR metabolomics, AMPK activation assays in rat cardiac tissue\",\n      \"pmids\": [\"24164426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Isoform specificity of the PPARγ-regulated Adss not resolved\", \"Causality between ADSS level and AMPK not established by direct ADSS manipulation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Recast ADSS-generated S-AMP as a signaling metabolite rather than a metabolic intermediate, showing it amplifies β-cell insulin exocytosis through SENP1.\",\n      \"evidence\": \"Metabolomics, pharmacological ADSS inhibition, siRNA, and patch-clamp electrophysiology with direct S-AMP addition to human β cells\",\n      \"pmids\": [\"26411681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of S-AMP downstream of SENP1 not identified\", \"Whether ADSS1 or ADSS2 supplies the relevant S-AMP not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed ADSS within the purinosome and linked the assembly of this multienzyme body to upregulated de novo purine flux, suggesting spatial channeling of the AMP-branch reaction.\",\n      \"evidence\": \"Fluorescence microscopy of purinosome assembly, purine nucleotide metabolomics, isotopic flux measurements in HeLa cells\",\n      \"pmids\": [\"25605736\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ADSS's specific contribution inferred from membership, not direct functional dissection within the complex\", \"Binding partners that recruit ADSS unidentified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified post-translational control of ADSS, establishing it as a CUL3-KCTD13 ubiquitin ligase substrate whose dysregulation alters purine-derived metabolite levels in neurons.\",\n      \"evidence\": \"Ubiquitylome MS comparison of Kctd13 mutant vs wild-type neurons, S-Ado metabolite quantification, ADSS inhibitor rescue\",\n      \"pmids\": [\"33409479\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site and consequence (degradation vs activity) not defined\", \"Direct ADSS-KCTD13 binding not reciprocally validated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Positioned ADSS as a regulatory node in the purine nucleotide cycle controlling AMPK activation in insulin-resistant muscle.\",\n      \"evidence\": \"Metformin treatment of fructose-fed rats with Western blot/qPCR for ADSS and AMPD1, AMP/ATP ratio and AMPK phosphorylation assays\",\n      \"pmids\": [\"36058289\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Expression-level correlation without direct ADSS manipulation to establish causality\", \"Isoform contributing to the muscle effect not specified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the β-cell S-AMP signaling model to drug action, showing ADSS-mediated S-AMP production is the mechanistic basis for imeglimin's proliferative and anti-apoptotic effects.\",\n      \"evidence\": \"ADSS pharmacological inhibition across mouse, human, porcine islets and stem-cell-derived β cells with proliferation/apoptosis assays and S-AMP quantification\",\n      \"pmids\": [\"40638403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream effectors of S-AMP in proliferation/apoptosis not mapped\", \"Inhibitor selectivity between ADSS isoforms not addressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected loss of AdSS activity to genome instability, showing IMP accumulation upon ortholog deletion drives error-prone DNA polymerase ζ-dependent mutagenesis.\",\n      \"evidence\": \"GC-MS metabolite profiling, growth/division, and mutagenesis assays in S. cerevisiae ade12 mutants\",\n      \"pmids\": [\"40331943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Demonstrated in yeast ortholog; relevance to human ADSS2 not tested\", \"Mechanism linking IMP buildup to polymerase ζ recruitment unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which functions are isoform-specific to ADSS2 versus shared with ADSS1, how S-AMP is sensed downstream, and what governs ADSS2 recruitment to the purinosome.\",\n      \"evidence\": \"No timeline discovery resolves these questions\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of human ADSS2\", \"Downstream S-AMP receptor/effector unidentified\", \"Purinosome recruitment determinants for ADSS2 unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [5, 7]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"purinosome\"],\n    \"partners\": [\"KCTD13\", \"CUL3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}