{"gene":"RPL37","run_date":"2026-06-10T07:46:26","timeline":{"discoveries":[{"year":2013,"finding":"RPL37 binds MDM2 and inhibits its E3 ubiquitin ligase activity, leading to stabilization of both MDM2 and p53, induction of cell cycle arrest and cell death, and downregulation of MdmX levels. The mechanism of MdmX downregulation by RPL37 is distinct from that of RPS15 and RPS20.","method":"Ectopic expression in p53-null cells and p53-containing cell lines; co-expression of Flag-MDM2 and HA-p53; E3 ligase activity assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in multiple cell contexts with mechanistic read-out (E3 ligase inhibition), single lab, multiple methods","pmids":["23874713"],"is_preprint":false},{"year":2010,"finding":"Depletion of RPL37 leads to cell cycle arrest in a L11- and p53-dependent manner (genetic epistasis). UV light and cisplatin induce proteasomal degradation of RPL37 in the nucleoplasm, which then leads to L11-dependent stabilization of p53. Conversely, ectopic RPL37 overexpression attenuates the DNA damage-induced p53 response.","method":"siRNA-mediated knockdown; L11 epistasis experiments; proteasome inhibitor rescue; ectopic overexpression with p53 activity readouts","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (L11 dependence), loss-of-function with defined pathway placement, single lab, multiple complementary approaches","pmids":["20935493"],"is_preprint":false},{"year":2004,"finding":"Non-phosphorylated La protein (npLa) specifically associates with RPL37 mRNA (a 5'TOP mRNA). Inhibition of CK2 (using TBB) or expression of non-phosphorylatable La A366 increases association of La with RPL37 mRNA and shifts a fraction of RPL37 mRNA off polysomes, indicating that CK2-mediated phosphorylation of La serine-366 limits 5'TOP mRNA binding and thereby positively regulates RPL37 mRNA translation.","method":"CK2 inhibitor (TBB) treatment; antisense knockdown; quantitative RT-PCR of mRNA-protein association; polysome profiling; transfection with phospho-mutant La constructs","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition plus phospho-mutant constructs plus polysome fractionation, single lab, multiple orthogonal methods","pmids":["15485924"],"is_preprint":false},{"year":1983,"finding":"The primary structure of rat liver ribosomal protein L37 (111 residues) was determined; the protein contains a disulfide bridge between cysteine residues at positions 40 and 69, and is homologous to yeast YP55 and E. coli L34, sharing a 17-residue segment also found in E. coli S4, L20, and L34.","method":"Protein sequencing of tryptic and cyanogen bromide peptides; Edman degradation; carboxypeptidase A treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical sequencing with multiple peptide overlaps and chemical cleavage methods establishing primary structure and disulfide bond","pmids":["6350292"],"is_preprint":false},{"year":1993,"finding":"Rat 60S ribosomal subunit protein L37 has 96 amino acids (NH2-terminal methionine cleaved post-translationally) and contains a single zinc finger-like motif of the C2-C2 type. The genomic copy number is approximately 13-14 copies.","method":"cDNA sequencing; deduced amino acid sequence analysis; Southern blot hybridization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct cDNA sequencing with structural inference; single lab; zinc-finger domain identification not functionally validated in this study","pmids":["8484768"],"is_preprint":false},{"year":1994,"finding":"Human RPL37 encodes a 97 amino acid protein with multiple potential serine/threonine phosphorylation sites and a zinc-finger domain.","method":"cDNA sequencing and amino acid sequence analysis from tumor and normal colon/liver cDNA sources","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/sequence analysis only, no functional validation of phosphorylation or zinc-finger activity","pmids":["7545944"],"is_preprint":false},{"year":1994,"finding":"In S. cerevisiae, RPL37 is encoded by duplicate genes (RPL37A and RPL37B) that are differentially expressed; RPL37A contributes ~6-fold more mRNA than RPL37B, disruption of RPL37A severely impairs growth, and disruption of both loci is lethal, establishing RPL37 as an essential ribosomal protein.","method":"Gene disruption; reporter gene fusions (measuring relative mRNA levels); growth assays","journal":"Current genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic disruption with growth phenotype readout, dual-locus epistasis, single lab with multiple complementary approaches in yeast ortholog","pmids":["8082197"],"is_preprint":false},{"year":2024,"finding":"YTHDC1 binds m6A-modified RPL37 mRNA and enhances RPL37 translation in an m6A-dependent manner in trophoblastic cells, thereby promoting overall translational output. Upstream, estradiol upregulates YTHDC1 expression via retinoid X receptor alpha (RXRA).","method":"RIP-seq; MeRIP-seq; siRNA knockdown; overexpression; CCK-8/EdU/Transwell/flow cytometry assays; ChIP-seq; luciferase reporter assays","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq and MeRIP-seq establish direct m6A-dependent binding; functional assays confirm translational effect; single lab, multiple orthogonal methods","pmids":["39725796"],"is_preprint":false},{"year":1976,"finding":"RPL37 protein was isolated and purified from the 60S ribosomal subunit of rat liver ribosomes with no detectable contamination, and its molecular weight and amino acid composition were determined, establishing it as a bona fide structural component of the large ribosomal subunit.","method":"Stepwise LiCl elution from carboxymethylcellulose; ion exchange chromatography; Sephadex filtration; SDS-PAGE; amino acid composition analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical purification from ribosomal subunit with compositional characterization, foundational structural biochemistry","pmids":["1002715"],"is_preprint":false}],"current_model":"RPL37 is an essential 60S large ribosomal subunit protein with a C2-C2 zinc-finger motif and a disulfide bridge, whose mRNA translation is positively regulated by CK2-mediated phosphorylation of La protein and by the m6A reader YTHDC1; under ribosomal stress or DNA damage (UV, cisplatin), RPL37 undergoes proteasomal degradation in the nucleoplasm, which triggers L11-dependent MDM2 inhibition and p53 stabilization, while exogenous RPL37 can itself bind and inhibit MDM2's E3 ligase activity to activate p53 and regulate the MDM2-p53-MdmX network."},"narrative":{"mechanistic_narrative":"RPL37 is an essential structural protein of the 60S large ribosomal subunit that also functions as a sensor and effector in the ribosomal stress–p53 surveillance pathway [PMID:1002715, PMID:20935493]. It was first purified as a bona fide component of the rat liver large subunit and sequenced as a small (~96–111 residue) protein bearing a Cys40–Cys69 disulfide bridge and a C2-C2 zinc-finger motif [PMID:1002715, PMID:6350292, PMID:8484768]. Beyond its ribosomal role, RPL37 couples ribosome integrity to p53: its mRNA is a 5'TOP transcript whose translation is positively controlled, with CK2-mediated phosphorylation of La protein limiting La binding to RPL37 mRNA and thereby promoting its polysome loading [PMID:15485924], and the m6A reader YTHDC1 enhancing RPL37 translation in an m6A-dependent manner [PMID:39725796]. Under ribosomal stress and DNA damage by UV or cisplatin, RPL37 is degraded by the proteasome in the nucleoplasm, triggering L11-dependent inhibition of MDM2 and stabilization of p53, with consequent cell cycle arrest; conversely RPL37 overexpression attenuates the DNA-damage p53 response [PMID:20935493]. Ectopic RPL37 directly binds MDM2 and inhibits its E3 ubiquitin ligase activity, stabilizing both MDM2 and p53 while downregulating MdmX through a mechanism distinct from RPS15 and RPS20 [PMID:23874713].","teleology":[{"year":1976,"claim":"Establishing whether L37 is a genuine ribosomal constituent rather than a co-purifying contaminant was the prerequisite for all later functional work; biochemical purification confirmed it as a structural subunit of the 60S particle.","evidence":"Stepwise LiCl/ion-exchange/Sephadex purification from rat liver 60S subunits with SDS-PAGE and amino acid composition","pmids":["1002715"],"confidence":"High","gaps":["No sequence or structural placement within the subunit","No functional role beyond structural assignment"]},{"year":1983,"claim":"The primary structure resolved the protein's covalent architecture, defining a 111-residue chain with an internal Cys40–Cys69 disulfide bridge and cross-kingdom homology, anchoring it within a conserved ribosomal protein family.","evidence":"Edman degradation and chemical cleavage peptide sequencing of rat liver L37","pmids":["6350292"],"confidence":"High","gaps":["Functional consequence of the disulfide bridge unknown","No three-dimensional structure"]},{"year":1993,"claim":"cDNA analysis refined the protein to 96 residues and identified a C2-C2 zinc-finger motif, raising the possibility of nucleic-acid or metal-dependent functions beyond structural scaffolding.","evidence":"cDNA sequencing and Southern blot copy-number analysis in rat","pmids":["8484768"],"confidence":"Medium","gaps":["Zinc-binding and zinc-finger function not experimentally validated","Discrepancy in length versus protein-sequencing data unresolved"]},{"year":1994,"claim":"Genetic dissection in yeast established RPL37 as essential, with duplicate differentially expressed loci, showing the gene is indispensable for viability.","evidence":"Gene disruption of RPL37A/RPL37B with reporter fusions and growth assays in S. cerevisiae","pmids":["8082197"],"confidence":"Medium","gaps":["Essentiality in mammalian cells not directly tested here","Molecular basis of essentiality (assembly vs. translation) not defined"]},{"year":1994,"claim":"Cloning of the human ortholog provided the human coding sequence and predicted phosphorylation sites and a zinc finger, extending the rat findings to human.","evidence":"cDNA sequencing from human colon/liver tumor and normal tissue","pmids":["7545944"],"confidence":"Low","gaps":["Sequence-only analysis with no functional validation of phosphorylation sites or zinc finger","No demonstration of activity in human cells"]},{"year":2004,"claim":"Identifying RPL37 mRNA as a 5'TOP target of La protein revealed a translational control node, showing CK2 phosphorylation of La regulates how much RPL37 message is loaded onto polysomes.","evidence":"CK2 inhibition (TBB), phospho-mutant La constructs, mRNA-protein association RT-PCR and polysome profiling","pmids":["15485924"],"confidence":"Medium","gaps":["Physiological signals controlling CK2-La-RPL37 axis not mapped","Quantitative impact on ribosome biogenesis not measured"]},{"year":2010,"claim":"Connecting RPL37 turnover to the p53 pathway recast it as a stress sensor: its nucleoplasmic proteasomal degradation under DNA damage drives L11-dependent MDM2 inhibition and p53 stabilization.","evidence":"siRNA knockdown, L11 epistasis, proteasome-inhibitor rescue and ectopic overexpression with p53 readouts in human cells","pmids":["20935493"],"confidence":"Medium","gaps":["E3 ligase mediating RPL37 degradation not identified","Whether free vs. ribosomal RPL37 is degraded unresolved"]},{"year":2013,"claim":"Demonstrating direct MDM2 binding defined RPL37 as an effector, not just a passive trigger, that inhibits MDM2 E3 activity and downregulates MdmX through a mechanism distinct from other ribosomal proteins.","evidence":"Ectopic expression in p53-null and p53-WT cells, Flag-MDM2/HA-p53 co-expression, E3 ligase activity assays","pmids":["23874713"],"confidence":"Medium","gaps":["Structural basis of RPL37-MDM2 interaction not solved","Mechanism of MdmX downregulation not molecularly defined","Reconciliation with the degradation model of [#1] incomplete"]},{"year":2024,"claim":"Adding a second translational regulator showed the m6A reader YTHDC1 boosts RPL37 translation, linking epitranscriptomic and hormonal (estradiol-RXRA) signaling to RPL37 output.","evidence":"RIP-seq, MeRIP-seq, knockdown/overexpression and ChIP-seq/luciferase assays in trophoblastic cells","pmids":["39725796"],"confidence":"Medium","gaps":["Whether YTHDC1 control of RPL37 feeds the p53 axis untested","Generalization beyond trophoblastic cells unknown"]},{"year":null,"claim":"How the structural ribosomal role, the 5'TOP/m6A translational control, and the MDM2-p53 surveillance function are integrated within a single coherent regulatory circuit remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of RPL37 in the human 60S subunit or in complex with MDM2","Identity of the stress-induced degradation machinery unknown","Whether translational regulation modulates the p53 response not directly tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[8,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[8]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[8,2,7]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,0]}],"complexes":["60S large ribosomal subunit"],"partners":["MDM2","RPL11","LA/SSB","YTHDC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P61927","full_name":"Large ribosomal subunit protein eL37","aliases":["60S ribosomal protein L37","G1.16"],"length_aa":97,"mass_kda":11.1,"function":"Component of the large ribosomal subunit (PubMed:23636399, PubMed:32669547). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:23636399, PubMed:32669547)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P61927/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPL37","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RPL37","total_profiled":1310},"omim":[{"mim_id":"617649","title":"UBIQUITIN-CONJUGATING ENZYME E2 O; UBE2O","url":"https://www.omim.org/entry/617649"},{"mim_id":"604181","title":"RIBOSOMAL PROTEIN L37; RPL37","url":"https://www.omim.org/entry/604181"},{"mim_id":"126060","title":"DIHYDROFOLATE REDUCTASE; DHFR","url":"https://www.omim.org/entry/126060"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPL37"},"hgnc":{"alias_symbol":["L37","eL37"],"prev_symbol":[]},"alphafold":{"accession":"P61927","domains":[{"cath_id":"2.20.25.30","chopping":"14-75","consensus_level":"high","plddt":95.3374,"start":14,"end":75}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P61927","model_url":"https://alphafold.ebi.ac.uk/files/AF-P61927-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P61927-F1-predicted_aligned_error_v6.png","plddt_mean":89.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPL37","jax_strain_url":"https://www.jax.org/strain/search?query=RPL37"},"sequence":{"accession":"P61927","fasta_url":"https://rest.uniprot.org/uniprotkb/P61927.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P61927/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P61927"}},"corpus_meta":[{"pmid":"23874713","id":"PMC_23874713","title":"Ribosomal proteins RPL37, RPS15 and RPS20 regulate the Mdm2-p53-MdmX network.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23874713","citation_count":140,"is_preprint":false},{"pmid":"9724090","id":"PMC_9724090","title":"Several genes encoding ribosomal proteins are over-expressed in prostate-cancer cell lines: confirmation of L7a and L37 over-expression in prostate-cancer tissue samples.","date":"1998","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/9724090","citation_count":94,"is_preprint":false},{"pmid":"1002715","id":"PMC_1002715","title":"Isolation of eukaryotic ribosomal proteins. Purification and characterization of the 60 S ribosomal subunit proteins L4, L5, L7, L9, L11, L12, L13, L21, L22, L23, L26, L27, L30, L33, L35', L37, and L39.","date":"1976","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1002715","citation_count":70,"is_preprint":false},{"pmid":"863909","id":"PMC_863909","title":"Isolation of eukaryotic ribosomal proteins. Purification and characterization of 60 S ribosomal subunit proteins L3, L6, L7', L8, L10, L15, L17, L18, L19, L23', L25, L27', L28, L29, L31, L32, L34, L35, L36, L36', and L37'.","date":"1977","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/863909","citation_count":68,"is_preprint":false},{"pmid":"15485924","id":"PMC_15485924","title":"CK2 is responsible for phosphorylation of human La protein serine-366 and can modulate rpL37 5'-terminal oligopyrimidine mRNA metabolism.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15485924","citation_count":60,"is_preprint":false},{"pmid":"10566557","id":"PMC_10566557","title":"Elevated expression of ribosomal protein genes L37, RPP-1, and S2 in the presence of mutant p53.","date":"1999","source":"Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/10566557","citation_count":54,"is_preprint":false},{"pmid":"20935493","id":"PMC_20935493","title":"Depletion of ribosomal protein L37 occurs in response to DNA damage and activates p53 through the L11/MDM2 pathway.","date":"2010","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/20935493","citation_count":52,"is_preprint":false},{"pmid":"6350292","id":"PMC_6350292","title":"The primary structure of rat liver ribosomal protein L37. Homology with yeast and bacterial ribosomal proteins.","date":"1983","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/6350292","citation_count":32,"is_preprint":false},{"pmid":"1937011","id":"PMC_1937011","title":"Tetrahymena thermophila acidic ribosomal protein L37 contains an archaebacterial type of C-terminus.","date":"1991","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/1937011","citation_count":21,"is_preprint":false},{"pmid":"16938280","id":"PMC_16938280","title":"Sexually dimorphic expression of the genes encoding ribosomal proteins L17 and L37 in the song control nuclei of juvenile zebra finches.","date":"2006","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/16938280","citation_count":19,"is_preprint":false},{"pmid":"19373862","id":"PMC_19373862","title":"Effects of estradiol on incorporation of new cells in the developing zebra finch song system: potential relationship to expression of ribosomal proteins L17 and L37.","date":"2009","source":"Developmental neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/19373862","citation_count":15,"is_preprint":false},{"pmid":"8082197","id":"PMC_8082197","title":"Saccharomyces cerevisiae ribosomal protein L37 is encoded by duplicate genes that are differentially expressed.","date":"1994","source":"Current genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8082197","citation_count":14,"is_preprint":false},{"pmid":"20933575","id":"PMC_20933575","title":"Sex- and age-related differences in ribosomal proteins L17 and L37, as well as androgen receptor protein, in the song control system of zebra finches.","date":"2010","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/20933575","citation_count":14,"is_preprint":false},{"pmid":"7588717","id":"PMC_7588717","title":"Cell cycle, differentiation and tissue-independent expression of ribosomal protein L37.","date":"1995","source":"European journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7588717","citation_count":13,"is_preprint":false},{"pmid":"7545944","id":"PMC_7545944","title":"Human ribosomal protein L37 has motifs predicting serine/threonine phosphorylation and a zinc-finger domain.","date":"1994","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/7545944","citation_count":13,"is_preprint":false},{"pmid":"8484768","id":"PMC_8484768","title":"The primary structure of L37--a rat ribosomal protein with a zinc finger-like motif.","date":"1993","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/8484768","citation_count":12,"is_preprint":false},{"pmid":"1840541","id":"PMC_1840541","title":"Screening a yeast promoter library leads to the isolation of the RP29/L32 and SNR17B/RPL37A divergent promoters and the discovery of a gene encoding ribosomal protein L37.","date":"1991","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/1840541","citation_count":10,"is_preprint":false},{"pmid":"9794220","id":"PMC_9794220","title":"The mechanism of thioacetamide-induced apoptosis in the L37 albumin-SV40 T-antigen transgenic rat hepatocyte-derived cell line occurs without DNA fragmentation.","date":"1998","source":"In vitro cellular & developmental biology. Animal","url":"https://pubmed.ncbi.nlm.nih.gov/9794220","citation_count":6,"is_preprint":false},{"pmid":"39725796","id":"PMC_39725796","title":"Upregulated YTHDC1 mediates trophoblastic dysfunction inducing preterm birth in ART conceptions through enhanced RPL37 translation.","date":"2024","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/39725796","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10394,"output_tokens":2280,"usd":0.032691,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9336,"output_tokens":3085,"usd":0.061902,"stage2_stop_reason":"end_turn"},"total_usd":0.094593,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"RPL37 binds MDM2 and inhibits its E3 ubiquitin ligase activity, leading to stabilization of both MDM2 and p53, induction of cell cycle arrest and cell death, and downregulation of MdmX levels. The mechanism of MdmX downregulation by RPL37 is distinct from that of RPS15 and RPS20.\",\n      \"method\": \"Ectopic expression in p53-null cells and p53-containing cell lines; co-expression of Flag-MDM2 and HA-p53; E3 ligase activity assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in multiple cell contexts with mechanistic read-out (E3 ligase inhibition), single lab, multiple methods\",\n      \"pmids\": [\"23874713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Depletion of RPL37 leads to cell cycle arrest in a L11- and p53-dependent manner (genetic epistasis). UV light and cisplatin induce proteasomal degradation of RPL37 in the nucleoplasm, which then leads to L11-dependent stabilization of p53. Conversely, ectopic RPL37 overexpression attenuates the DNA damage-induced p53 response.\",\n      \"method\": \"siRNA-mediated knockdown; L11 epistasis experiments; proteasome inhibitor rescue; ectopic overexpression with p53 activity readouts\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (L11 dependence), loss-of-function with defined pathway placement, single lab, multiple complementary approaches\",\n      \"pmids\": [\"20935493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Non-phosphorylated La protein (npLa) specifically associates with RPL37 mRNA (a 5'TOP mRNA). Inhibition of CK2 (using TBB) or expression of non-phosphorylatable La A366 increases association of La with RPL37 mRNA and shifts a fraction of RPL37 mRNA off polysomes, indicating that CK2-mediated phosphorylation of La serine-366 limits 5'TOP mRNA binding and thereby positively regulates RPL37 mRNA translation.\",\n      \"method\": \"CK2 inhibitor (TBB) treatment; antisense knockdown; quantitative RT-PCR of mRNA-protein association; polysome profiling; transfection with phospho-mutant La constructs\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition plus phospho-mutant constructs plus polysome fractionation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15485924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1983,\n      \"finding\": \"The primary structure of rat liver ribosomal protein L37 (111 residues) was determined; the protein contains a disulfide bridge between cysteine residues at positions 40 and 69, and is homologous to yeast YP55 and E. coli L34, sharing a 17-residue segment also found in E. coli S4, L20, and L34.\",\n      \"method\": \"Protein sequencing of tryptic and cyanogen bromide peptides; Edman degradation; carboxypeptidase A treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical sequencing with multiple peptide overlaps and chemical cleavage methods establishing primary structure and disulfide bond\",\n      \"pmids\": [\"6350292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Rat 60S ribosomal subunit protein L37 has 96 amino acids (NH2-terminal methionine cleaved post-translationally) and contains a single zinc finger-like motif of the C2-C2 type. The genomic copy number is approximately 13-14 copies.\",\n      \"method\": \"cDNA sequencing; deduced amino acid sequence analysis; Southern blot hybridization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct cDNA sequencing with structural inference; single lab; zinc-finger domain identification not functionally validated in this study\",\n      \"pmids\": [\"8484768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Human RPL37 encodes a 97 amino acid protein with multiple potential serine/threonine phosphorylation sites and a zinc-finger domain.\",\n      \"method\": \"cDNA sequencing and amino acid sequence analysis from tumor and normal colon/liver cDNA sources\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/sequence analysis only, no functional validation of phosphorylation or zinc-finger activity\",\n      \"pmids\": [\"7545944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"In S. cerevisiae, RPL37 is encoded by duplicate genes (RPL37A and RPL37B) that are differentially expressed; RPL37A contributes ~6-fold more mRNA than RPL37B, disruption of RPL37A severely impairs growth, and disruption of both loci is lethal, establishing RPL37 as an essential ribosomal protein.\",\n      \"method\": \"Gene disruption; reporter gene fusions (measuring relative mRNA levels); growth assays\",\n      \"journal\": \"Current genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic disruption with growth phenotype readout, dual-locus epistasis, single lab with multiple complementary approaches in yeast ortholog\",\n      \"pmids\": [\"8082197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"YTHDC1 binds m6A-modified RPL37 mRNA and enhances RPL37 translation in an m6A-dependent manner in trophoblastic cells, thereby promoting overall translational output. Upstream, estradiol upregulates YTHDC1 expression via retinoid X receptor alpha (RXRA).\",\n      \"method\": \"RIP-seq; MeRIP-seq; siRNA knockdown; overexpression; CCK-8/EdU/Transwell/flow cytometry assays; ChIP-seq; luciferase reporter assays\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq and MeRIP-seq establish direct m6A-dependent binding; functional assays confirm translational effect; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39725796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1976,\n      \"finding\": \"RPL37 protein was isolated and purified from the 60S ribosomal subunit of rat liver ribosomes with no detectable contamination, and its molecular weight and amino acid composition were determined, establishing it as a bona fide structural component of the large ribosomal subunit.\",\n      \"method\": \"Stepwise LiCl elution from carboxymethylcellulose; ion exchange chromatography; Sephadex filtration; SDS-PAGE; amino acid composition analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical purification from ribosomal subunit with compositional characterization, foundational structural biochemistry\",\n      \"pmids\": [\"1002715\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPL37 is an essential 60S large ribosomal subunit protein with a C2-C2 zinc-finger motif and a disulfide bridge, whose mRNA translation is positively regulated by CK2-mediated phosphorylation of La protein and by the m6A reader YTHDC1; under ribosomal stress or DNA damage (UV, cisplatin), RPL37 undergoes proteasomal degradation in the nucleoplasm, which triggers L11-dependent MDM2 inhibition and p53 stabilization, while exogenous RPL37 can itself bind and inhibit MDM2's E3 ligase activity to activate p53 and regulate the MDM2-p53-MdmX network.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPL37 is an essential structural protein of the 60S large ribosomal subunit that also functions as a sensor and effector in the ribosomal stress–p53 surveillance pathway [#8, #1]. It was first purified as a bona fide component of the rat liver large subunit and sequenced as a small (~96–111 residue) protein bearing a Cys40–Cys69 disulfide bridge and a C2-C2 zinc-finger motif [#8, #3, #4]. Beyond its ribosomal role, RPL37 couples ribosome integrity to p53: its mRNA is a 5'TOP transcript whose translation is positively controlled, with CK2-mediated phosphorylation of La protein limiting La binding to RPL37 mRNA and thereby promoting its polysome loading [#2], and the m6A reader YTHDC1 enhancing RPL37 translation in an m6A-dependent manner [#7]. Under ribosomal stress and DNA damage by UV or cisplatin, RPL37 is degraded by the proteasome in the nucleoplasm, triggering L11-dependent inhibition of MDM2 and stabilization of p53, with consequent cell cycle arrest; conversely RPL37 overexpression attenuates the DNA-damage p53 response [#1]. Ectopic RPL37 directly binds MDM2 and inhibits its E3 ubiquitin ligase activity, stabilizing both MDM2 and p53 while downregulating MdmX through a mechanism distinct from RPS15 and RPS20 [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 1976,\n      \"claim\": \"Establishing whether L37 is a genuine ribosomal constituent rather than a co-purifying contaminant was the prerequisite for all later functional work; biochemical purification confirmed it as a structural subunit of the 60S particle.\",\n      \"evidence\": \"Stepwise LiCl/ion-exchange/Sephadex purification from rat liver 60S subunits with SDS-PAGE and amino acid composition\",\n      \"pmids\": [\"1002715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No sequence or structural placement within the subunit\", \"No functional role beyond structural assignment\"]\n    },\n    {\n      \"year\": 1983,\n      \"claim\": \"The primary structure resolved the protein's covalent architecture, defining a 111-residue chain with an internal Cys40–Cys69 disulfide bridge and cross-kingdom homology, anchoring it within a conserved ribosomal protein family.\",\n      \"evidence\": \"Edman degradation and chemical cleavage peptide sequencing of rat liver L37\",\n      \"pmids\": [\"6350292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the disulfide bridge unknown\", \"No three-dimensional structure\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"cDNA analysis refined the protein to 96 residues and identified a C2-C2 zinc-finger motif, raising the possibility of nucleic-acid or metal-dependent functions beyond structural scaffolding.\",\n      \"evidence\": \"cDNA sequencing and Southern blot copy-number analysis in rat\",\n      \"pmids\": [\"8484768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Zinc-binding and zinc-finger function not experimentally validated\", \"Discrepancy in length versus protein-sequencing data unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Genetic dissection in yeast established RPL37 as essential, with duplicate differentially expressed loci, showing the gene is indispensable for viability.\",\n      \"evidence\": \"Gene disruption of RPL37A/RPL37B with reporter fusions and growth assays in S. cerevisiae\",\n      \"pmids\": [\"8082197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Essentiality in mammalian cells not directly tested here\", \"Molecular basis of essentiality (assembly vs. translation) not defined\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Cloning of the human ortholog provided the human coding sequence and predicted phosphorylation sites and a zinc finger, extending the rat findings to human.\",\n      \"evidence\": \"cDNA sequencing from human colon/liver tumor and normal tissue\",\n      \"pmids\": [\"7545944\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Sequence-only analysis with no functional validation of phosphorylation sites or zinc finger\", \"No demonstration of activity in human cells\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying RPL37 mRNA as a 5'TOP target of La protein revealed a translational control node, showing CK2 phosphorylation of La regulates how much RPL37 message is loaded onto polysomes.\",\n      \"evidence\": \"CK2 inhibition (TBB), phospho-mutant La constructs, mRNA-protein association RT-PCR and polysome profiling\",\n      \"pmids\": [\"15485924\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological signals controlling CK2-La-RPL37 axis not mapped\", \"Quantitative impact on ribosome biogenesis not measured\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connecting RPL37 turnover to the p53 pathway recast it as a stress sensor: its nucleoplasmic proteasomal degradation under DNA damage drives L11-dependent MDM2 inhibition and p53 stabilization.\",\n      \"evidence\": \"siRNA knockdown, L11 epistasis, proteasome-inhibitor rescue and ectopic overexpression with p53 readouts in human cells\",\n      \"pmids\": [\"20935493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating RPL37 degradation not identified\", \"Whether free vs. ribosomal RPL37 is degraded unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating direct MDM2 binding defined RPL37 as an effector, not just a passive trigger, that inhibits MDM2 E3 activity and downregulates MdmX through a mechanism distinct from other ribosomal proteins.\",\n      \"evidence\": \"Ectopic expression in p53-null and p53-WT cells, Flag-MDM2/HA-p53 co-expression, E3 ligase activity assays\",\n      \"pmids\": [\"23874713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of RPL37-MDM2 interaction not solved\", \"Mechanism of MdmX downregulation not molecularly defined\", \"Reconciliation with the degradation model of [#1] incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Adding a second translational regulator showed the m6A reader YTHDC1 boosts RPL37 translation, linking epitranscriptomic and hormonal (estradiol-RXRA) signaling to RPL37 output.\",\n      \"evidence\": \"RIP-seq, MeRIP-seq, knockdown/overexpression and ChIP-seq/luciferase assays in trophoblastic cells\",\n      \"pmids\": [\"39725796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether YTHDC1 control of RPL37 feeds the p53 axis untested\", \"Generalization beyond trophoblastic cells unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the structural ribosomal role, the 5'TOP/m6A translational control, and the MDM2-p53 surveillance function are integrated within a single coherent regulatory circuit remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of RPL37 in the human 60S subunit or in complex with MDM2\", \"Identity of the stress-induced degradation machinery unknown\", \"Whether translational regulation modulates the p53 response not directly tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [8, 2, 7]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 0]}\n    ],\n    \"complexes\": [\"60S large ribosomal subunit\"],\n    \"partners\": [\"MDM2\", \"RPL11\", \"La/SSB\", \"YTHDC1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}