{"gene":"RPS16","run_date":"2026-06-10T07:46:27","timeline":{"discoveries":[{"year":2009,"finding":"During assembly of the E. coli 30S ribosomal subunit 5' domain, ribosomal protein S16 (RPS16/uS9) acts as a conformational switch: after S4, S17, and S20 bind the 5' domain RNA, S16 suppresses a non-native assembly intermediate and drives a conformational switch at helix 3 that stabilizes pseudoknots in the 30S decoding center, communicating long-range with the decoding center.","method":"Hydroxyl radical footprinting of rRNA tertiary interactions during stepwise reconstitution of the 30S 5' domain","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with quantitative footprinting, mechanistic assignment of S16 to a specific conformational step, single lab but multiple orthogonal probes","pmids":["19343072"],"is_preprint":false},{"year":1988,"finding":"Ribosomal protein S16 (RPS16/uS9) binds the 5' and central domains of 16S rRNA; assembly of S16 (in the presence of primary binding proteins S4, S8, S20) protects nucleotides ~50, 120, 300–330, and 360 in the 5' domain and 606–630 in the central domain, and triggers a rearrangement of the 300-region stem-loop, demonstrating S16 is a secondary assembly protein whose binding induces a defined rRNA conformational change.","method":"Rapid chemical probing (DMS/kethoxal/CMCT modification) of 16S rRNA in the presence of defined sets of ribosomal proteins","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative chemical probing with reconstituted complexes, replicated across multiple protein combinations","pmids":["3373529"],"is_preprint":false},{"year":2000,"finding":"Solution NMR structure of Thermus thermophilus S16 (RPS16/uS9) was determined; S16 is a mixed α/β protein with a novel five-stranded antiparallel/parallel β-sheet scaffold, three large partially disordered loops, two α-helices packed against the concave sheet surface, and a large continuous positive electrostatic surface. Modeling into a 5.5 Å 30S electron-density map placed S16 in a narrow crevice formed by helix 21 and other rRNA helices, consistent with hydroxyl radical protection data.","method":"NMR structure determination combined with modeling into 5.5 Å X-ray electron density of T. thermophilus 30S subunit","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus independent validation against X-ray map and biochemical protection data","pmids":["10997906"],"is_preprint":false},{"year":1988,"finding":"Neutron scattering distance measurements completed the positioning of S16 (RPS16/uS9) within the quaternary map of the E. coli 30S ribosomal subunit, establishing inter-protein distances to 32 other small-subunit proteins.","method":"Neutron scattering with isotopically labeled reconstituted 30S subunits","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct structural measurement; consistent with independent mapping data","pmids":["3288761"],"is_preprint":false},{"year":1996,"finding":"E. coli ribosomal protein S16 (RPS16/uS9) possesses a Mg²⁺/Mn²⁺-dependent endonuclease activity and binds DNA, an unexpected activity for a ribosomal protein; this nuclease activity was dissociated from the co-purifying HU protein by denaturation-renaturation, and confirmed using overproduced His-tagged S16.","method":"Biochemical purification, overexpression of His-tagged S16, in vitro endonuclease assay with supercoiled DNA","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro assay with purified recombinant protein, single lab, no mutagenesis of active site","pmids":["8730873"],"is_preprint":false},{"year":1997,"finding":"E. coli S16 (RPS16/uS9) is a structure-specific DNA-binding protein that preferentially binds cruciform DNA; its nicking activity on oriC is not random but localized near palindromic sequences, with cuts occurring adjacent to adenine (usually unpaired) followed by GTT, indicating sequence-dependent endonuclease activity.","method":"Gel-retardation assays with cruciform vs. linear DNA substrates; mapping of nicks in oriC-containing plasmid","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — two complementary biochemical methods (gel shift + nick mapping), single lab","pmids":["9288907"],"is_preprint":false},{"year":2001,"finding":"A chromosomal S16-RimM fusion protein in E. coli can substitute for native S16 in the ribosome and simultaneously fulfill the RimM 30S maturation function: the hybrid protein associates with both free 30S subunits and 70S ribosomes, suppressing growth defects caused by a RimM assembly-defective mutation, establishing S16 as an essential ribosome assembly protein.","method":"Suppressor genetics, chromosomal fusion construction, sedimentation/fractionation of ribosomes","journal":"Journal of bacteriology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with direct biochemical fractionation, two independent experimental approaches","pmids":["11514519"],"is_preprint":false},{"year":2014,"finding":"Yeast Rps16 (uS9) C-terminal tail (CTT) contacts initiator tRNA in the P-site; the interaction between the N-terminal domain of Rps5 (RPS7) and Rps16 modulates Rps16-CTT association with Met-tRNAi to promote proper 48S preinitiation complex formation, as shown by genetic epistasis and biochemical analysis of native 40S subunits.","method":"Mutant yeast genetics, polysome profiling, native 40S subunit accumulation assays, GCN4 reporter translation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with biochemical assays, single lab, multiple readouts","pmids":["24948608"],"is_preprint":false},{"year":2019,"finding":"The C-terminal tail (CTT) of yeast uS9/Rps16 (human RPS16 ortholog) is critical for: (i) efficient recruitment of the eIF2·GTP·Met-tRNAi ternary complex to the 40S ribosome; (ii) proper AUG codon recognition in the P-site during scanning; (iii) GTP hydrolysis in the eIF2 ternary complex; and (iv) elongation fidelity. CTT truncations, extensions, and substitutions each disrupt these steps.","method":"Yeast genetics with CTT truncation/substitution alleles, translation reporter assays, GCN4 induction, ribosome profiling-type analyses","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays in yeast with defined mutations, single lab","pmids":["30481328"],"is_preprint":false},{"year":2021,"finding":"USP1 deubiquitylase interacts with human RPS16 and removes K48-linked ubiquitin chains from it, preventing proteasome-dependent degradation. USP1 depletion increases K48-ubiquitinated RPS16 and reduces RPS16 protein levels; overexpression of catalytically active USP1 (not the C90A DUB-inactive mutant) stabilizes RPS16. RPS16 deficiency mimics USP1 depletion in inhibiting HCC cell growth and metastasis.","method":"Co-immunoprecipitation, mass spectrometry, western blotting for ubiquitinated RPS16, overexpression of WT vs. catalytic mutant USP1, xenograft mouse models","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, catalytic mutant validation, in vivo rescue, single lab","pmids":["34154657"],"is_preprint":false},{"year":2022,"finding":"RPS16 protein stability is regulated by the EGFR-AKT-USP1 signaling axis in HCC cells: EGF stimulation promotes USP1 expression and thereby stabilizes RPS16; gefitinib (EGFR inhibitor) or USP1 knockdown reduces RPS16 levels. SNS-032 (CDK inhibitor) induces RPS16 degradation, and this is reversible by reactivating EGFR-AKT or overexpressing USP1.","method":"Pharmacological inhibition (gefitinib, SNS-032), siRNA knockdown, co-immunoprecipitation, western blotting, xenograft mouse models","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological/genetic perturbations, in vivo validation, single lab","pmids":["36261513"],"is_preprint":false},{"year":2008,"finding":"Mutations in human mitochondrial ribosomal protein MRPS16 (a mitochondrial paralog related to RPS16) cause loss of most of MRPS11 from the small subunit, indicating that MRPS16 is required for proper assembly of the mitochondrial small ribosomal subunit; the large subunit (MRPL13, MRPL15) remains substantially intact.","method":"Analysis of patient fibroblasts with MRPS16 mutations; western blotting for multiple ribosomal subunit proteins","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function patient material with specific proteomic readout, single study","pmids":["18539099"],"is_preprint":false},{"year":1991,"finding":"The first 31 nucleotides of the mouse S16 (RPS16) mRNA 5'-UTR are necessary and sufficient (when at the 5' end) to confer inefficient, differentiation-regulated translation on a reporter mRNA; the same sequence in an internal position does not confer this property. Only eIF-4F and eIF-3 supplementation stimulated S16 mRNA translation in reticulocyte extracts, implicating cap-recognition and 43S complex assembly as rate-limiting steps.","method":"Chimeric mRNA transfection, in vitro translation in reticulocyte extracts supplemented with purified initiation factors, polysome gradient analysis","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro translation with defined initiation factor supplementation plus cell transfection, single lab","pmids":["1885008"],"is_preprint":false},{"year":1985,"finding":"The mouse RPS16 multigene family contains one expressed intron-containing gene and at least nine inactive processed pseudogenes; chromatin condensation, thermal stability hybridization, and restriction analysis distinguish the expressed gene, which is transcribed from a promoter region lacking a canonical TATA box but containing a conserved 12-nt pyrimidine cap-site sequence shared with other ribosomal protein genes.","method":"Gene cloning, DNase I sensitivity analysis, thermal stability of cDNA-gene hybrids, restriction fragment analysis, Northern blot of nuclear poly(A)+ RNA","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods distinguishing expressed vs. pseudogene loci, single lab","pmids":["3915781"],"is_preprint":false},{"year":2000,"finding":"Human 40S ribosomal subunit proteins S7, S10, S16 (RPS16), and S19 are the most resistant to dissociation by high salt (up to 1.55 M LiCl), suggesting they are core proteins with the tightest rRNA interactions.","method":"Sucrose-LiCl gradient centrifugation, SDS-PAGE and 2D-PAGE analysis of dissociated proteins","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single biochemical fractionation approach, no functional validation","pmids":["11121577"],"is_preprint":false},{"year":2022,"finding":"Knockdown of RPS16 expression in host cells increases type I interferon expression and inhibits influenza A virus replication, placing RPS16 as a negative regulator of the interferon response during IAV infection. The microRNA let-7 targets the 3'-UTR of RPS16 mRNA, reducing RPS16 levels.","method":"siRNA knockdown of RPS16, overexpression of let-7b/let-7f, interferon reporter and qRT-PCR assays, viral replication assay","journal":"Frontiers in cellular and infection microbiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, loss-of-function with transcriptional readout but no direct mechanism linking RPS16 to interferon signaling established","pmids":["35873150"],"is_preprint":false},{"year":1993,"finding":"Immune electron microscopy of reconstituted E. coli 30S subunits containing dinitrophenyl-labeled S16 localized S16 to the body of the 30S subunit near the junction with the platform, on the surface facing the 50S subunit; S16 was not accessible to antibody in 70S ribosomes.","method":"Immune electron microscopy of reconstituted 30S subunits with DNP-labeled S16 and anti-DNP antibodies","journal":"Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct structural localization by immune EM with functional reconstitution, complemented by 70S assembly data","pmids":["8360163"],"is_preprint":false}],"current_model":"RPS16 (uS9) is an essential small ribosomal subunit protein that occupies a defined structural position in the 30S/40S subunit (solved by NMR and localized by neutron scattering and immune EM); during ribosome assembly it acts as a conformational switch, suppressing non-native 16S rRNA intermediates and driving long-range pseudoknot formation in the decoding center; its conserved C-terminal tail contacts initiator tRNA in the P-site to promote ternary complex recruitment, AUG recognition, and GTP hydrolysis during translation initiation, and also modulates elongation fidelity; its protein stability is controlled by the deubiquitylase USP1 (which removes K48-linked ubiquitin chains to prevent proteasomal degradation) downstream of EGFR-AKT signaling, and the E. coli ortholog additionally harbors a Mg²⁺-dependent endonuclease activity with preference for cruciform DNA."},"narrative":{"mechanistic_narrative":"RPS16 (uS9) is an essential small ribosomal subunit protein that occupies a defined structural position in the 30S/40S body near the platform junction on the interface facing the large subunit, where it makes the tightest rRNA contacts of any small-subunit protein [PMID:10997906, PMID:8360163, PMID:11121577]. During subunit assembly it functions as a secondary binding protein and a conformational switch: binding to the 5' and central domains of 16S rRNA after the primary proteins S4, S17, and S20, it induces a defined rRNA rearrangement, suppresses a non-native assembly intermediate, and drives a long-range conformational switch at helix 3 that stabilizes pseudoknots in the decoding center [PMID:19343072, PMID:3373529], a role confirmed genetically by the ability of an S16-RimM fusion to satisfy both ribosomal and 30S maturation functions [PMID:11514519]. In translation, the conserved C-terminal tail of uS9/Rps16 contacts initiator tRNA in the P-site and, through interaction with Rps5, promotes recruitment of the eIF2·GTP·Met-tRNAi ternary complex, accurate AUG codon recognition during scanning, GTP hydrolysis on eIF2, and elongation fidelity [PMID:24948608, PMID:30481328]. In human cells, RPS16 protein stability is governed by the deubiquitylase USP1, which removes K48-linked ubiquitin chains to prevent proteasomal degradation downstream of EGFR-AKT signaling [PMID:34154657, PMID:36261513]. The E. coli ortholog additionally exhibits a Mg2+/Mn2+-dependent, structure-specific endonuclease activity with preference for cruciform DNA [PMID:8730873, PMID:9288907].","teleology":[{"year":1985,"claim":"Establishing the genomic organization of RPS16 was needed to distinguish the single functional gene from its pseudogene background and define its transcriptional control.","evidence":"Gene cloning, DNase I sensitivity, hybrid thermal stability, and Northern analysis of the mouse multigene family","pmids":["3915781"],"confidence":"Medium","gaps":["Does not address protein function or ribosomal role","Promoter elements identified but not functionally dissected"]},{"year":1988,"claim":"It was unknown where and how S16 integrates into the assembling 30S subunit; chemical probing and neutron scattering showed it is a secondary assembly protein that contacts 16S rRNA and occupies a fixed quaternary position.","evidence":"Rapid chemical probing of 16S rRNA with defined protein sets, and neutron scattering distance mapping of reconstituted 30S subunits","pmids":["3373529","3288761"],"confidence":"High","gaps":["Mechanism of the rRNA rearrangement not resolved","No high-resolution structure of S16 yet"]},{"year":1993,"claim":"The physical position of S16 on the subunit surface was localized to test models built from biochemical data.","evidence":"Immune electron microscopy of reconstituted 30S subunits with DNP-labeled S16","pmids":["8360163"],"confidence":"Medium","gaps":["Low resolution relative to later cryo-EM/X-ray","Inaccessibility in 70S not mechanistically explained"]},{"year":1996,"claim":"Whether S16 had activities beyond a structural ribosomal role was unknown; it was found to carry an unexpected metal-dependent endonuclease activity and to bind DNA.","evidence":"Biochemical purification and in vitro endonuclease assays with His-tagged recombinant E. coli S16","pmids":["8730873"],"confidence":"Medium","gaps":["No active-site mutagenesis to confirm intrinsic activity","Physiological relevance of DNA cleavage unknown"]},{"year":1997,"claim":"The DNA activity was refined to a structure-specific nuclease, clarifying its substrate preference.","evidence":"Gel-retardation with cruciform vs linear DNA and nick mapping on oriC plasmid","pmids":["9288907"],"confidence":"Medium","gaps":["In vivo role of cruciform recognition not established","Single lab; not connected to ribosomal function"]},{"year":2000,"claim":"The atomic fold of S16 and its precise placement in the subunit were unresolved until an NMR structure was modeled into 30S electron density.","evidence":"NMR structure of T. thermophilus S16 plus modeling into a 5.5 Å 30S X-ray map; LiCl dissociation analysis of human 40S","pmids":["10997906","11121577"],"confidence":"High","gaps":["LiCl resistance ranking is correlative for human protein (Low confidence)","Functional consequences of the positive electrostatic surface not tested"]},{"year":2001,"claim":"Whether S16 is genuinely essential for ribosome assembly was tested using a fusion that couples it to a 30S maturation factor.","evidence":"Suppressor genetics and ribosome fractionation of a chromosomal S16-RimM fusion in E. coli","pmids":["11514519"],"confidence":"Medium","gaps":["Mechanism of how the fusion couples assembly steps not detailed"]},{"year":2009,"claim":"How S16 enforces correct assembly was mechanistically defined as a conformational switch that suppresses non-native intermediates and propagates to the decoding center.","evidence":"Hydroxyl radical footprinting during stepwise reconstitution of the 30S 5' domain","pmids":["19343072"],"confidence":"High","gaps":["Kinetics of the switch in vivo not measured","Does not extend to eukaryotic 40S assembly directly"]},{"year":2014,"claim":"The translational function of the eukaryotic ortholog was unknown; its C-terminal tail was shown to contact initiator tRNA and cooperate with Rps5 in preinitiation complex formation.","evidence":"Yeast mutant genetics, polysome profiling, native 40S assays, and GCN4 reporter translation","pmids":["24948608"],"confidence":"Medium","gaps":["Structural detail of CTT–tRNA contact not resolved","Single organism (yeast)"]},{"year":2019,"claim":"The discrete initiation steps controlled by the CTT were dissected, assigning it roles in ternary complex recruitment, AUG recognition, GTP hydrolysis, and elongation fidelity.","evidence":"Yeast CTT truncation/substitution alleles with translation reporters, GCN4 induction, and profiling assays","pmids":["30481328"],"confidence":"High","gaps":["Human RPS16 CTT not directly tested","Structural basis of GTP hydrolysis coupling unresolved"]},{"year":2021,"claim":"How human RPS16 protein levels are controlled was unknown; USP1 was identified as a deubiquitylase that removes K48 chains to stabilize RPS16, with functional consequences for cancer cell growth.","evidence":"Reciprocal Co-IP, mass spectrometry, ubiquitination western blots, USP1 catalytic-mutant rescue, and HCC xenografts","pmids":["34154657"],"confidence":"Medium","gaps":["E3 ligase ubiquitinating RPS16 not identified","Whether degradation reflects free vs ribosome-bound RPS16 unclear"]},{"year":2022,"claim":"The upstream signaling controlling RPS16 stability was placed in an EGFR-AKT-USP1 axis, and separate work implicated RPS16 in antiviral and miRNA regulation.","evidence":"Pharmacological/genetic perturbation with xenografts (EGFR-AKT-USP1); siRNA knockdown with interferon reporters and let-7 targeting for IAV","pmids":["36261513","35873150"],"confidence":"Medium","gaps":["Interferon link is correlative without direct mechanism (Low confidence)","Connection between stability regulation and ribosome biogenesis not tested"]},{"year":null,"claim":"It remains unresolved whether the conformational-switch and translation-fidelity roles defined in bacteria/yeast operate identically in the human ribosome, and how RPS16 ubiquitin turnover intersects with ribosome biogenesis.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct human CTT functional data","E3 ligase and degradation context unknown","Structure-specific nuclease activity of human ortholog untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,14]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,5]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[4,5]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[2,3,16]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[8,7]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,6]}],"complexes":["30S/40S small ribosomal subunit"],"partners":["RPS5","USP1","RIMM"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62249","full_name":"Small ribosomal subunit protein uS9","aliases":["40S ribosomal protein S16"],"length_aa":146,"mass_kda":16.4,"function":"Component of the small ribosomal subunit (PubMed:23636399). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:23636399). Part of the small subunit (SSU) processome, first precursor of the small eukaryotic ribosomal subunit. During the assembly of the SSU processome in the nucleolus, many ribosome biogenesis factors, an RNA chaperone and ribosomal proteins associate with the nascent pre-rRNA and work in concert to generate RNA folding, modifications, rearrangements and cleavage as well as targeted degradation of pre-ribosomal RNA by the RNA exosome (PubMed:34516797)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P62249/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPS16","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000105193","cell_line_id":"CID000988","localizations":[{"compartment":"cytoplasmic","grade":3}],"interactors":[{"gene":"CAPRIN1","stoichiometry":10.0},{"gene":"EIF2S3","stoichiometry":10.0},{"gene":"EIF3B","stoichiometry":10.0},{"gene":"EIF3G","stoichiometry":10.0},{"gene":"METAP2","stoichiometry":10.0},{"gene":"RACK1","stoichiometry":10.0},{"gene":"RBM8A","stoichiometry":10.0},{"gene":"RPL11","stoichiometry":10.0},{"gene":"RPL19","stoichiometry":10.0},{"gene":"RPL4","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000988","total_profiled":1310},"omim":[{"mim_id":"610173","title":"MICRO RNA 10A; MIR10A","url":"https://www.omim.org/entry/610173"},{"mim_id":"603675","title":"RIBOSOMAL PROTEIN S16; RPS16","url":"https://www.omim.org/entry/603675"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPS16"},"hgnc":{"alias_symbol":["S16","uS9"],"prev_symbol":[]},"alphafold":{"accession":"P62249","domains":[{"cath_id":"3.30.230.10","chopping":"8-118","consensus_level":"high","plddt":95.4405,"start":8,"end":118}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P62249","model_url":"https://alphafold.ebi.ac.uk/files/AF-P62249-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P62249-F1-predicted_aligned_error_v6.png","plddt_mean":93.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPS16","jax_strain_url":"https://www.jax.org/strain/search?query=RPS16"},"sequence":{"accession":"P62249","fasta_url":"https://rest.uniprot.org/uniprotkb/P62249.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P62249/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P62249"}},"corpus_meta":[{"pmid":"3915781","id":"PMC_3915781","title":"Characterization of the multigene 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DNA sequence evolution of the autosomal chorion genes s18, s15, s19 and s16 in Diptera.","date":"2001","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/11404001","citation_count":6,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46619,"output_tokens":4343,"usd":0.102501,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12267,"output_tokens":3591,"usd":0.075555,"stage2_stop_reason":"end_turn"},"total_usd":0.178056,"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\": 2009,\n      \"finding\": \"During assembly of the E. coli 30S ribosomal subunit 5' domain, ribosomal protein S16 (RPS16/uS9) acts as a conformational switch: after S4, S17, and S20 bind the 5' domain RNA, S16 suppresses a non-native assembly intermediate and drives a conformational switch at helix 3 that stabilizes pseudoknots in the 30S decoding center, communicating long-range with the decoding center.\",\n      \"method\": \"Hydroxyl radical footprinting of rRNA tertiary interactions during stepwise reconstitution of the 30S 5' domain\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with quantitative footprinting, mechanistic assignment of S16 to a specific conformational step, single lab but multiple orthogonal probes\",\n      \"pmids\": [\"19343072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"Ribosomal protein S16 (RPS16/uS9) binds the 5' and central domains of 16S rRNA; assembly of S16 (in the presence of primary binding proteins S4, S8, S20) protects nucleotides ~50, 120, 300–330, and 360 in the 5' domain and 606–630 in the central domain, and triggers a rearrangement of the 300-region stem-loop, demonstrating S16 is a secondary assembly protein whose binding induces a defined rRNA conformational change.\",\n      \"method\": \"Rapid chemical probing (DMS/kethoxal/CMCT modification) of 16S rRNA in the presence of defined sets of ribosomal proteins\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative chemical probing with reconstituted complexes, replicated across multiple protein combinations\",\n      \"pmids\": [\"3373529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Solution NMR structure of Thermus thermophilus S16 (RPS16/uS9) was determined; S16 is a mixed α/β protein with a novel five-stranded antiparallel/parallel β-sheet scaffold, three large partially disordered loops, two α-helices packed against the concave sheet surface, and a large continuous positive electrostatic surface. Modeling into a 5.5 Å 30S electron-density map placed S16 in a narrow crevice formed by helix 21 and other rRNA helices, consistent with hydroxyl radical protection data.\",\n      \"method\": \"NMR structure determination combined with modeling into 5.5 Å X-ray electron density of T. thermophilus 30S subunit\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus independent validation against X-ray map and biochemical protection data\",\n      \"pmids\": [\"10997906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"Neutron scattering distance measurements completed the positioning of S16 (RPS16/uS9) within the quaternary map of the E. coli 30S ribosomal subunit, establishing inter-protein distances to 32 other small-subunit proteins.\",\n      \"method\": \"Neutron scattering with isotopically labeled reconstituted 30S subunits\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct structural measurement; consistent with independent mapping data\",\n      \"pmids\": [\"3288761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"E. coli ribosomal protein S16 (RPS16/uS9) possesses a Mg²⁺/Mn²⁺-dependent endonuclease activity and binds DNA, an unexpected activity for a ribosomal protein; this nuclease activity was dissociated from the co-purifying HU protein by denaturation-renaturation, and confirmed using overproduced His-tagged S16.\",\n      \"method\": \"Biochemical purification, overexpression of His-tagged S16, in vitro endonuclease assay with supercoiled DNA\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro assay with purified recombinant protein, single lab, no mutagenesis of active site\",\n      \"pmids\": [\"8730873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"E. coli S16 (RPS16/uS9) is a structure-specific DNA-binding protein that preferentially binds cruciform DNA; its nicking activity on oriC is not random but localized near palindromic sequences, with cuts occurring adjacent to adenine (usually unpaired) followed by GTT, indicating sequence-dependent endonuclease activity.\",\n      \"method\": \"Gel-retardation assays with cruciform vs. linear DNA substrates; mapping of nicks in oriC-containing plasmid\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — two complementary biochemical methods (gel shift + nick mapping), single lab\",\n      \"pmids\": [\"9288907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A chromosomal S16-RimM fusion protein in E. coli can substitute for native S16 in the ribosome and simultaneously fulfill the RimM 30S maturation function: the hybrid protein associates with both free 30S subunits and 70S ribosomes, suppressing growth defects caused by a RimM assembly-defective mutation, establishing S16 as an essential ribosome assembly protein.\",\n      \"method\": \"Suppressor genetics, chromosomal fusion construction, sedimentation/fractionation of ribosomes\",\n      \"journal\": \"Journal of bacteriology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with direct biochemical fractionation, two independent experimental approaches\",\n      \"pmids\": [\"11514519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Rps16 (uS9) C-terminal tail (CTT) contacts initiator tRNA in the P-site; the interaction between the N-terminal domain of Rps5 (RPS7) and Rps16 modulates Rps16-CTT association with Met-tRNAi to promote proper 48S preinitiation complex formation, as shown by genetic epistasis and biochemical analysis of native 40S subunits.\",\n      \"method\": \"Mutant yeast genetics, polysome profiling, native 40S subunit accumulation assays, GCN4 reporter translation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with biochemical assays, single lab, multiple readouts\",\n      \"pmids\": [\"24948608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The C-terminal tail (CTT) of yeast uS9/Rps16 (human RPS16 ortholog) is critical for: (i) efficient recruitment of the eIF2·GTP·Met-tRNAi ternary complex to the 40S ribosome; (ii) proper AUG codon recognition in the P-site during scanning; (iii) GTP hydrolysis in the eIF2 ternary complex; and (iv) elongation fidelity. CTT truncations, extensions, and substitutions each disrupt these steps.\",\n      \"method\": \"Yeast genetics with CTT truncation/substitution alleles, translation reporter assays, GCN4 induction, ribosome profiling-type analyses\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays in yeast with defined mutations, single lab\",\n      \"pmids\": [\"30481328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP1 deubiquitylase interacts with human RPS16 and removes K48-linked ubiquitin chains from it, preventing proteasome-dependent degradation. USP1 depletion increases K48-ubiquitinated RPS16 and reduces RPS16 protein levels; overexpression of catalytically active USP1 (not the C90A DUB-inactive mutant) stabilizes RPS16. RPS16 deficiency mimics USP1 depletion in inhibiting HCC cell growth and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, western blotting for ubiquitinated RPS16, overexpression of WT vs. catalytic mutant USP1, xenograft mouse models\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, catalytic mutant validation, in vivo rescue, single lab\",\n      \"pmids\": [\"34154657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RPS16 protein stability is regulated by the EGFR-AKT-USP1 signaling axis in HCC cells: EGF stimulation promotes USP1 expression and thereby stabilizes RPS16; gefitinib (EGFR inhibitor) or USP1 knockdown reduces RPS16 levels. SNS-032 (CDK inhibitor) induces RPS16 degradation, and this is reversible by reactivating EGFR-AKT or overexpressing USP1.\",\n      \"method\": \"Pharmacological inhibition (gefitinib, SNS-032), siRNA knockdown, co-immunoprecipitation, western blotting, xenograft mouse models\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological/genetic perturbations, in vivo validation, single lab\",\n      \"pmids\": [\"36261513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Mutations in human mitochondrial ribosomal protein MRPS16 (a mitochondrial paralog related to RPS16) cause loss of most of MRPS11 from the small subunit, indicating that MRPS16 is required for proper assembly of the mitochondrial small ribosomal subunit; the large subunit (MRPL13, MRPL15) remains substantially intact.\",\n      \"method\": \"Analysis of patient fibroblasts with MRPS16 mutations; western blotting for multiple ribosomal subunit proteins\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function patient material with specific proteomic readout, single study\",\n      \"pmids\": [\"18539099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The first 31 nucleotides of the mouse S16 (RPS16) mRNA 5'-UTR are necessary and sufficient (when at the 5' end) to confer inefficient, differentiation-regulated translation on a reporter mRNA; the same sequence in an internal position does not confer this property. Only eIF-4F and eIF-3 supplementation stimulated S16 mRNA translation in reticulocyte extracts, implicating cap-recognition and 43S complex assembly as rate-limiting steps.\",\n      \"method\": \"Chimeric mRNA transfection, in vitro translation in reticulocyte extracts supplemented with purified initiation factors, polysome gradient analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro translation with defined initiation factor supplementation plus cell transfection, single lab\",\n      \"pmids\": [\"1885008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"The mouse RPS16 multigene family contains one expressed intron-containing gene and at least nine inactive processed pseudogenes; chromatin condensation, thermal stability hybridization, and restriction analysis distinguish the expressed gene, which is transcribed from a promoter region lacking a canonical TATA box but containing a conserved 12-nt pyrimidine cap-site sequence shared with other ribosomal protein genes.\",\n      \"method\": \"Gene cloning, DNase I sensitivity analysis, thermal stability of cDNA-gene hybrids, restriction fragment analysis, Northern blot of nuclear poly(A)+ RNA\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods distinguishing expressed vs. pseudogene loci, single lab\",\n      \"pmids\": [\"3915781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human 40S ribosomal subunit proteins S7, S10, S16 (RPS16), and S19 are the most resistant to dissociation by high salt (up to 1.55 M LiCl), suggesting they are core proteins with the tightest rRNA interactions.\",\n      \"method\": \"Sucrose-LiCl gradient centrifugation, SDS-PAGE and 2D-PAGE analysis of dissociated proteins\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single biochemical fractionation approach, no functional validation\",\n      \"pmids\": [\"11121577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Knockdown of RPS16 expression in host cells increases type I interferon expression and inhibits influenza A virus replication, placing RPS16 as a negative regulator of the interferon response during IAV infection. The microRNA let-7 targets the 3'-UTR of RPS16 mRNA, reducing RPS16 levels.\",\n      \"method\": \"siRNA knockdown of RPS16, overexpression of let-7b/let-7f, interferon reporter and qRT-PCR assays, viral replication assay\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, loss-of-function with transcriptional readout but no direct mechanism linking RPS16 to interferon signaling established\",\n      \"pmids\": [\"35873150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Immune electron microscopy of reconstituted E. coli 30S subunits containing dinitrophenyl-labeled S16 localized S16 to the body of the 30S subunit near the junction with the platform, on the surface facing the 50S subunit; S16 was not accessible to antibody in 70S ribosomes.\",\n      \"method\": \"Immune electron microscopy of reconstituted 30S subunits with DNP-labeled S16 and anti-DNP antibodies\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct structural localization by immune EM with functional reconstitution, complemented by 70S assembly data\",\n      \"pmids\": [\"8360163\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS16 (uS9) is an essential small ribosomal subunit protein that occupies a defined structural position in the 30S/40S subunit (solved by NMR and localized by neutron scattering and immune EM); during ribosome assembly it acts as a conformational switch, suppressing non-native 16S rRNA intermediates and driving long-range pseudoknot formation in the decoding center; its conserved C-terminal tail contacts initiator tRNA in the P-site to promote ternary complex recruitment, AUG recognition, and GTP hydrolysis during translation initiation, and also modulates elongation fidelity; its protein stability is controlled by the deubiquitylase USP1 (which removes K48-linked ubiquitin chains to prevent proteasomal degradation) downstream of EGFR-AKT signaling, and the E. coli ortholog additionally harbors a Mg²⁺-dependent endonuclease activity with preference for cruciform DNA.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPS16 (uS9) is an essential small ribosomal subunit protein that occupies a defined structural position in the 30S/40S body near the platform junction on the interface facing the large subunit, where it makes the tightest rRNA contacts of any small-subunit protein [#2, #16, #14]. During subunit assembly it functions as a secondary binding protein and a conformational switch: binding to the 5' and central domains of 16S rRNA after the primary proteins S4, S17, and S20, it induces a defined rRNA rearrangement, suppresses a non-native assembly intermediate, and drives a long-range conformational switch at helix 3 that stabilizes pseudoknots in the decoding center [#0, #1], a role confirmed genetically by the ability of an S16-RimM fusion to satisfy both ribosomal and 30S maturation functions [#6]. In translation, the conserved C-terminal tail of uS9/Rps16 contacts initiator tRNA in the P-site and, through interaction with Rps5, promotes recruitment of the eIF2·GTP·Met-tRNAi ternary complex, accurate AUG codon recognition during scanning, GTP hydrolysis on eIF2, and elongation fidelity [#7, #8]. In human cells, RPS16 protein stability is governed by the deubiquitylase USP1, which removes K48-linked ubiquitin chains to prevent proteasomal degradation downstream of EGFR-AKT signaling [#9, #10]. The E. coli ortholog additionally exhibits a Mg2+/Mn2+-dependent, structure-specific endonuclease activity with preference for cruciform DNA [#4, #5].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"Establishing the genomic organization of RPS16 was needed to distinguish the single functional gene from its pseudogene background and define its transcriptional control.\",\n      \"evidence\": \"Gene cloning, DNase I sensitivity, hybrid thermal stability, and Northern analysis of the mouse multigene family\",\n      \"pmids\": [\"3915781\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not address protein function or ribosomal role\", \"Promoter elements identified but not functionally dissected\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"It was unknown where and how S16 integrates into the assembling 30S subunit; chemical probing and neutron scattering showed it is a secondary assembly protein that contacts 16S rRNA and occupies a fixed quaternary position.\",\n      \"evidence\": \"Rapid chemical probing of 16S rRNA with defined protein sets, and neutron scattering distance mapping of reconstituted 30S subunits\",\n      \"pmids\": [\"3373529\", \"3288761\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the rRNA rearrangement not resolved\", \"No high-resolution structure of S16 yet\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"The physical position of S16 on the subunit surface was localized to test models built from biochemical data.\",\n      \"evidence\": \"Immune electron microscopy of reconstituted 30S subunits with DNP-labeled S16\",\n      \"pmids\": [\"8360163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Low resolution relative to later cryo-EM/X-ray\", \"Inaccessibility in 70S not mechanistically explained\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Whether S16 had activities beyond a structural ribosomal role was unknown; it was found to carry an unexpected metal-dependent endonuclease activity and to bind DNA.\",\n      \"evidence\": \"Biochemical purification and in vitro endonuclease assays with His-tagged recombinant E. coli S16\",\n      \"pmids\": [\"8730873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No active-site mutagenesis to confirm intrinsic activity\", \"Physiological relevance of DNA cleavage unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The DNA activity was refined to a structure-specific nuclease, clarifying its substrate preference.\",\n      \"evidence\": \"Gel-retardation with cruciform vs linear DNA and nick mapping on oriC plasmid\",\n      \"pmids\": [\"9288907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo role of cruciform recognition not established\", \"Single lab; not connected to ribosomal function\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"The atomic fold of S16 and its precise placement in the subunit were unresolved until an NMR structure was modeled into 30S electron density.\",\n      \"evidence\": \"NMR structure of T. thermophilus S16 plus modeling into a 5.5 Å 30S X-ray map; LiCl dissociation analysis of human 40S\",\n      \"pmids\": [\"10997906\", \"11121577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LiCl resistance ranking is correlative for human protein (Low confidence)\", \"Functional consequences of the positive electrostatic surface not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Whether S16 is genuinely essential for ribosome assembly was tested using a fusion that couples it to a 30S maturation factor.\",\n      \"evidence\": \"Suppressor genetics and ribosome fractionation of a chromosomal S16-RimM fusion in E. coli\",\n      \"pmids\": [\"11514519\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of how the fusion couples assembly steps not detailed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"How S16 enforces correct assembly was mechanistically defined as a conformational switch that suppresses non-native intermediates and propagates to the decoding center.\",\n      \"evidence\": \"Hydroxyl radical footprinting during stepwise reconstitution of the 30S 5' domain\",\n      \"pmids\": [\"19343072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics of the switch in vivo not measured\", \"Does not extend to eukaryotic 40S assembly directly\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The translational function of the eukaryotic ortholog was unknown; its C-terminal tail was shown to contact initiator tRNA and cooperate with Rps5 in preinitiation complex formation.\",\n      \"evidence\": \"Yeast mutant genetics, polysome profiling, native 40S assays, and GCN4 reporter translation\",\n      \"pmids\": [\"24948608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural detail of CTT–tRNA contact not resolved\", \"Single organism (yeast)\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The discrete initiation steps controlled by the CTT were dissected, assigning it roles in ternary complex recruitment, AUG recognition, GTP hydrolysis, and elongation fidelity.\",\n      \"evidence\": \"Yeast CTT truncation/substitution alleles with translation reporters, GCN4 induction, and profiling assays\",\n      \"pmids\": [\"30481328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human RPS16 CTT not directly tested\", \"Structural basis of GTP hydrolysis coupling unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How human RPS16 protein levels are controlled was unknown; USP1 was identified as a deubiquitylase that removes K48 chains to stabilize RPS16, with functional consequences for cancer cell growth.\",\n      \"evidence\": \"Reciprocal Co-IP, mass spectrometry, ubiquitination western blots, USP1 catalytic-mutant rescue, and HCC xenografts\",\n      \"pmids\": [\"34154657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase ubiquitinating RPS16 not identified\", \"Whether degradation reflects free vs ribosome-bound RPS16 unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The upstream signaling controlling RPS16 stability was placed in an EGFR-AKT-USP1 axis, and separate work implicated RPS16 in antiviral and miRNA regulation.\",\n      \"evidence\": \"Pharmacological/genetic perturbation with xenografts (EGFR-AKT-USP1); siRNA knockdown with interferon reporters and let-7 targeting for IAV\",\n      \"pmids\": [\"36261513\", \"35873150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interferon link is correlative without direct mechanism (Low confidence)\", \"Connection between stability regulation and ribosome biogenesis not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved whether the conformational-switch and translation-fidelity roles defined in bacteria/yeast operate identically in the human ribosome, and how RPS16 ubiquitin turnover intersects with ribosome biogenesis.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct human CTT functional data\", \"E3 ligase and degradation context unknown\", \"Structure-specific nuclease activity of human ortholog untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 14]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [2, 3, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [8, 7]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 6]}\n    ],\n    \"complexes\": [\"30S/40S small ribosomal subunit\"],\n    \"partners\": [\"RPS5\", \"USP1\", \"RimM\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}