{"gene":"RPL29","run_date":"2026-06-10T07:46:26","timeline":{"discoveries":[{"year":1990,"finding":"Two specific seven-amino-acid segments from yeast ribosomal protein L29 function as nuclear localizing sequences (NLS); basic residues, especially a particular Arg residue, are critical for nuclear localization. Arg→Lys substitution in the proximal NLS greatly reduced ribosome assembly and cell growth, and substitution in both NLS caused a still greater defect, placing these sequences as necessary for both nuclear import and ribosome assembly.","method":"Reporter protein fusion, mutagenesis (Arg→Lys substitutions), yeast growth assays, ribosome assembly analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis combined with functional readouts (ribosome assembly, growth) in yeast; multiple orthogonal approaches in one rigorous study","pmids":["2104804"],"is_preprint":false},{"year":1980,"finding":"A mutation in the structural gene for yeast ribosomal protein L29 confers cycloheximide resistance, demonstrating that L29 is the target of cycloheximide action in the large (60S) ribosomal subunit.","method":"Two-dimensional gel electrophoresis of ribosomal proteins, genetic co-segregation analysis in yeast","journal":"Current genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical identification of altered protein plus genetic co-segregation, replicated in multiple studies across organisms","pmids":["24189656"],"is_preprint":false},{"year":1982,"finding":"The yeast cycloheximide resistance gene CYH2 encodes ribosomal protein L29, a component of the large (60S) subunit; the gene is present as a single copy and contains an intervening sequence.","method":"Molecular cloning, cross-hybridization, blot hybridization","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular cloning with direct gene identification and cross-hybridization, consistent with biochemical mutant data","pmids":["6285288"],"is_preprint":false},{"year":1981,"finding":"E. coli ribosomal protein L29 is cross-linked to positions 99–107 of 23S rRNA in the 50S subunit, placing L29 in direct contact with this specific rRNA region.","method":"RNA-protein cross-linking with 2-iminothiolane followed by UV irradiation; RNA fragment identification","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution/cross-linking assay, single study","pmids":["6170935"],"is_preprint":false},{"year":1985,"finding":"A mutant E. coli lacking ribosomal proteins S17 and L29 was used to localize L29 to the back of the 50S subunit, on the opposite side from the subunit interface, by immunoelectron microscopy.","method":"Isolation of deletion mutant, immunological localization on ribosomal surface by electron microscopy","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization using null mutant as control, single study","pmids":["3926498"],"is_preprint":false},{"year":1984,"finding":"Ribosomal proteins L6 and L29 occupy closely adjacent sites in mammalian 60S subunits and can be cross-linked via intermolecular disulfide bonds; the interacting cysteine of L29 is located approximately 40 residues from its C-terminus.","method":"Disulfide cross-linking, S-cleavage after cyanylation, polyacrylamide gel electrophoresis, autoradiography","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct biochemical cross-linking with site localization, single study","pmids":["6468376"],"is_preprint":false},{"year":1993,"finding":"In Bacillus stearothermophilus ribosomes, cross-linking with diepoxybutane identified L23 and L29 as neighboring proteins; the cross-link involved Met-1 of L23 and Lys-4 of L29.","method":"Chemical cross-linking with diepoxybutane, protein isolation, sequence analysis and mass spectrometry","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro cross-linking with atomic-level site identification, single study","pmids":["8444837"],"is_preprint":false},{"year":1998,"finding":"Murine HIP/RPL29 (identical to ribosomal protein L29) is enriched in the 100,000×g particulate (membrane) fraction of mammary epithelial cells and behaves as a peripheral membrane protein (eluted with 0.8 M NaCl); recombinant murine HIP/RPL29 binds heparin directly and selectively compared to other glycosaminoglycans.","method":"Cell fractionation, salt extraction, gel overlay binding assay with 125I-heparin, heparin-agarose affinity chromatography with glycosaminoglycan competition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods (fractionation, gel overlay, affinity chromatography) in single rigorous study","pmids":["9737974"],"is_preprint":false},{"year":2000,"finding":"Multiple distinct domains of human and murine HIP/RPL29 contribute to heparin/heparan sulfate (Hp/HS) binding; heparin binding induces a conformational change in human HIP/RPL29 detected by circular dichroism spectroscopy.","method":"Deletion mutants, proteolytic fragments, protease-protection assays, circular dichroism spectroscopy","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (deletion analysis, proteolysis, CD spectroscopy) identifying binding domains and conformational change","pmids":["11123893"],"is_preprint":false},{"year":2002,"finding":"Deletion of yeast RPL29 causes accumulation of half-mer polysomes and impaired 60S-to-40S subunit joining; synthetic lethality with RPL10 (essential for subunit joining) and RSA1 (required for Rpl10 loading onto 60S), and RPL10 over-expression suppresses the half-mer phenotype, placing RPL29 as a facilitator of proper 60S subunit assembly and ribosomal subunit joining.","method":"Gene deletion, polysome profiling, in vitro translation, synthetic lethality epistasis analysis, gene over-expression suppression assay","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis, polysome profiling, and suppression assay in yeast; multiple orthogonal methods in one rigorous study","pmids":["11997090"],"is_preprint":false},{"year":1989,"finding":"Mouse ribosomal protein L27' (ortholog of yeast L29) can functionally substitute for yeast L29 in yeast ribosomes (supporting normal growth in L29-null cells), but is outcompeted when yeast L29 is also present, demonstrating evolutionary conservation of ribosomal function.","method":"cDNA expression in yeast, cycloheximide sensitivity assay, growth complementation assay in L29-null yeast","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional complementation in vivo with multiple genetic controls","pmids":["2643099"],"is_preprint":false},{"year":2007,"finding":"HIP/RPL29-null mice are viable but show global growth reduction (~50% smaller), delayed embryonic growth from mid-gestation, decreased proliferation and protein synthesis in embryonic fibroblasts, and reduced steady-state levels of core ribosomal proteins, establishing RPL29 as a regulator of global protein synthesis rate.","method":"Gene targeting/knockout mice, phenotypic analysis, cell proliferation assays, protein synthesis measurement, Western blotting for core RPs","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with multiple orthogonal cellular and molecular readouts; definitive in vivo phenotype","pmids":["17195189"],"is_preprint":false},{"year":2006,"finding":"Knockdown of HIP/RPL29 by siRNA in LS174T colon cancer cells induces cellular differentiation (upregulation of galectin-4 and mucin-2 markers) accompanied by upregulation of p21 and p53, placing RPL29 in a pathway that suppresses differentiation through p21/p53.","method":"siRNA knockdown, marker expression analysis (galectin-4, mucin-2), Western blot for p21/p53","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean siRNA knockdown with defined molecular markers, single lab study","pmids":["16475173"],"is_preprint":false},{"year":2003,"finding":"Ribozyme-mediated partial knockdown of HIP/RPL29 in C3H/10T(1/2) multipotent cells accelerates differentiation into cartilage-like cells, demonstrating that HIP/RPL29 expression maintains chondrocyte proliferation and opposes differentiation.","method":"Ribozyme-mediated knockdown, chondrogenic differentiation assay, histochemical and molecular marker analysis","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional knockdown with defined cellular phenotype, single lab","pmids":["12919102"],"is_preprint":false},{"year":2008,"finding":"HIP/RPL29 inhibits VEGF- and FGF2-stimulated angiogenesis by displacing HS-bound growth factors from perlecan domain I and antagonizing heparanase (HPSE) activity (inhibiting soluble HS release); partial inhibition of VEGFR2 phosphorylation at Y951 (migration-associated site) was also observed.","method":"Endothelial tube formation assay, aortic explant assay, HBGF displacement from HS-bearing perlecan, HPSE activity assay, Western blot for receptor phosphorylation","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal in vitro assays identifying mechanism; single lab","pmids":["18980226"],"is_preprint":false},{"year":2002,"finding":"Recombinant HIP/RPL29 inhibits bFGF-induced proliferation of gingival fibroblasts and specifically blocks bFGF stimulation of p44 (Erk-1) MAPK phosphorylation in a dose-dependent manner, without affecting IGF-1 responses, indicating that HIP/RPL29 modulates bFGF bioavailability via HS interactions.","method":"Cell proliferation assay, Western blot for MAPK phosphorylation, dose-response analysis with recombinant HIP/RPL29","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple cellular readouts with specificity controls, single lab","pmids":["12097308"],"is_preprint":false},{"year":2012,"finding":"RPL29 regulates tumour angiogenesis in vivo: VEGF-stimulated microvessel sprouting is significantly reduced in Rpl29-heterozygous and Rpl29-null aortic ring assays ex vivo, and tumour blood vessel density is reduced in Rpl29-mutant mice bearing Lewis lung carcinomas; siRNA depletion of Rpl29 also inhibits VEGF-induced sprouting.","method":"Rpl29 heterozygous/null mouse models, ex vivo aortic ring sprouting assay, in vivo tumour implantation, siRNA knockdown, immunohistochemistry for vessel density","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic and siRNA approaches with in vivo and ex vivo readouts; genetic and RNAi evidence converge","pmids":["23118343"],"is_preprint":false},{"year":2018,"finding":"Ribosomal protein RPL29/eL29 is a major substrate of the lysine methyltransferase Set7/9; RPL29 lysine 5 (Rpl29K5) is methylated exclusively by Set7/9 and can be demethylated by Lsd1/Kdm1a. Methylation at K5 does not affect global protein synthesis but alters RPL29 subcellular localization.","method":"Mass spectrometry substrate identification, methyltransferase assay with Set7/9 and mutants, methylation-specific antibody validation, Set7/9 inhibitor ((R)-PFI-2) treatment, subcellular localization analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — enzymatic assay identifying writer/eraser, specific antibody validation, pharmacological inhibitor confirmation, localization readout; multiple methods in one rigorous study","pmids":["29959229"],"is_preprint":false},{"year":2018,"finding":"Isotopically labeled RPL29 can be reconstituted into the 50S large ribosomal subunit; RPL29 is located at the exit of the polypeptide tunnel of the 50S subunit and can undergo allosteric conformational changes induced by the nascent polypeptide chain, potentially triggering interactions with chaperones (trigger factor or SRP).","method":"Isotopic labeling, in vitro reconstitution into 50S subunit, solid-state and solution NMR","journal":"Methods in molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — structural NMR reconstitution approach, methodological paper with limited functional validation described in abstract","pmids":["29605910"],"is_preprint":false},{"year":2020,"finding":"Human ribosomal protein eL29 (RPL29) binds its own cognate mRNA in cells at the 3' part of the coding sequence (CDS), mimicking its rRNA binding site; overproduced eL29 inhibits translation of the eL29 mRNA CDS transcript in a cell-free system and co-immunoprecipitates with eL29 mRNA from ribosome-depleted lysate, establishing a feedback autoregulation of eL29 synthesis.","method":"4-thiouridine-enhanced CLIP (PAR-CLIP) in HEK293T cells, next-generation sequencing, co-immunoprecipitation of mRNA, cell-free translation inhibition assay","journal":"Biochimie","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — PAR-CLIP, IP, and in vitro translation assay all converging on same mechanism; multiple orthogonal methods in single study","pmids":["32798643"],"is_preprint":false},{"year":2002,"finding":"HIP/RPL29 intracellular distribution shifts between nuclear and cytoplasmic compartments depending on mammary epithelial cell growth/differentiation state (nuclear in proliferating/differentiating cells, cytoplasmic in mature secretory cells), as confirmed by GFP-fusion protein live imaging.","method":"Immunohistochemistry, cell fractionation, GFP-fusion protein transfection and live imaging in NMuMG cells","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — immunohistochemistry and live-cell GFP imaging show compartment shift linked to differentiation state; single lab but orthogonal methods","pmids":["11803571"],"is_preprint":false},{"year":1998,"finding":"E. coli ribosomal protein L29 and acyl carrier protein (ACP) together stimulate binding of TnsD to the Tn7 attachment site (attTn7) and stimulate Tn7 transposition in vitro; mutations in L29 drastically decrease Tn7 transposition in vivo specifically for TnsABC+D reactions.","method":"In vitro transposition assay, TnsD binding assay, L29 mutant analysis in vivo","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro and in vivo functional assays demonstrating novel non-ribosomal role; single study, E. coli (prokaryotic) protein","pmids":["9755182"],"is_preprint":false},{"year":2025,"finding":"RPL29 mRNA is a direct target of IGF2BP1/3 (m6A readers) in a METTL14-dependent manner; luciferase reporter assays showed increased mRNA stability of the RPL29 3'-UTR upon co-expression of IGF2BP1/3 and METTL3/14, indicating that m6A modification promotes IGF2BP1/3-mediated stabilization of RPL29 mRNA.","method":"eCLIP data intersection analysis, 3'-UTR luciferase reporter assay, IGF2BP1/3 and METTL3/14 overexpression","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, luciferase reporter assay for mRNA stability, single lab, no direct protein-level mechanistic validation","pmids":["bio_10.1101_2025.05.04.652102"],"is_preprint":true}],"current_model":"RPL29/eL29 is a component of the 60S large ribosomal subunit positioned at the polypeptide exit tunnel, where it facilitates subunit joining and modulates the rate of global protein synthesis; it undergoes methylation at Lys5 by Set7/9 (reversible by Lsd1) which controls its subcellular localization, and autoregulates its own translation by binding the coding sequence of its cognate mRNA; outside the ribosome, RPL29/HIP functions as a peripheral membrane heparin/heparan sulfate-binding protein that antagonizes growth factor (VEGF, FGF2) signaling by competing for HS-binding and inhibiting heparanase, thereby regulating angiogenesis and cell differentiation."},"narrative":{"mechanistic_narrative":"RPL29 (eL29) is a component of the large (60S/50S) ribosomal subunit that facilitates ribosomal subunit assembly and joining and modulates the rate of global protein synthesis [PMID:11997090, PMID:17195189]. Within the ribosome it sits at the exit of the polypeptide tunnel, where it can undergo nascent-chain-induced conformational changes [PMID:29605910], and it contacts neighboring large-subunit proteins and rRNA [PMID:6170935, PMID:6468376, PMID:8444837]. Yeast RPL29 carries internal nuclear-localizing sequences whose basic residues are required for both nuclear import and ribosome assembly [PMID:2104804], and its loss produces half-mer polysomes reflecting defective 60S subunit joining, genetically linked to the RPL10/RSA1 assembly axis [PMID:11997090]. Loss of RPL29 in mice causes global growth retardation with reduced proliferation, lowered protein synthesis, and decreased steady-state levels of core ribosomal proteins [PMID:17195189]. The protein is post-translationally methylated at Lys5 exclusively by Set7/9 and demethylated by Lsd1/Kdm1a, a modification that controls its subcellular localization without altering global translation [PMID:29959229], and it autoregulates its own synthesis by binding the 3' coding region of its cognate mRNA in a manner mimicking its rRNA contact site [PMID:32798643]. Beyond the ribosome, RPL29 (HIP) acts as a peripheral membrane heparin/heparan sulfate-binding protein whose multiple binding domains undergo a conformational change upon heparin binding [PMID:9737974, PMID:11123893]; through this activity it antagonizes VEGF- and FGF2-driven signaling by displacing growth factors from heparan sulfate and inhibiting heparanase, thereby restraining angiogenesis in vivo and opposing cellular differentiation [PMID:18980226, PMID:23118343, PMID:16475173, PMID:12919102].","teleology":[{"year":1982,"claim":"Genetic and biochemical work established that the yeast cycloheximide-resistance locus encodes a single-copy large-subunit ribosomal protein, defining L29/RPL29 as a bona fide 60S component and target of cycloheximide.","evidence":"2D gel electrophoresis of mutant ribosomal proteins, genetic co-segregation, and molecular cloning of CYH2 in yeast","pmids":["24189656","6285288"],"confidence":"Medium","gaps":["Does not define the protein's structural position or assembly function","Mechanism of cycloheximide resistance at the residue level not established"]},{"year":1985,"claim":"Cross-linking and immunoelectron microscopy positioned the protein on the large subunit surface and its rRNA/protein neighborhood, providing the first structural placement.","evidence":"RNA-protein and protein-protein cross-linking and immuno-EM localization in bacterial and mammalian large subunits","pmids":["6170935","3926498","6468376","8444837"],"confidence":"Medium","gaps":["Surface/back placement from EM predates atomic structures and the exit-tunnel assignment","Functional consequence of these contacts not tested"]},{"year":1990,"claim":"Mutagenesis showed that internal basic NLS segments are required for both nuclear import and ribosome assembly, linking the protein's localization signals to its assembly role.","evidence":"Reporter fusions, Arg→Lys substitutions, ribosome assembly and growth assays in yeast","pmids":["2104804"],"confidence":"High","gaps":["Import receptor/pathway not identified","How NLS residues mechanistically couple to assembly is unclear"]},{"year":1989,"claim":"Cross-species complementation demonstrated functional conservation of the ribosomal role from mammals to yeast.","evidence":"Mouse L27'/ortholog cDNA expression rescuing growth in L29-null yeast","pmids":["2643099"],"confidence":"High","gaps":["Competition by endogenous yeast L29 indicates incomplete equivalence","Does not address non-ribosomal functions"]},{"year":2002,"claim":"Genetic deletion in yeast assigned RPL29 a specific role in 60S maturation and subunit joining, situating it on the RPL10/RSA1 assembly axis.","evidence":"Gene deletion, polysome profiling (half-mers), synthetic lethality with RPL10/RSA1, and RPL10-overexpression suppression in yeast","pmids":["11997090"],"confidence":"High","gaps":["Direct molecular role in joining versus indirect assembly effect not separated","Human equivalence not tested in this study"]},{"year":2007,"claim":"A knockout mouse established RPL29 as a regulator of global protein synthesis rate and organismal growth in mammals.","evidence":"Gene-targeted knockout mice with growth, proliferation, protein-synthesis, and core-RP Western blot readouts","pmids":["17195189"],"confidence":"High","gaps":["Whether reduced synthesis reflects assembly defect or other roles not resolved","Tissue-specific contributions not dissected"]},{"year":1998,"claim":"Identification of the protein as the heparin-binding HIP revealed a non-ribosomal, peripheral membrane heparin/heparan sulfate-binding activity.","evidence":"Cell fractionation, salt extraction, gel-overlay heparin binding, and heparin-agarose affinity chromatography with GAG competition","pmids":["9737974"],"confidence":"High","gaps":["How a ribosomal protein reaches the membrane is unexplained","Physiological partner HS structures not defined"]},{"year":2002,"claim":"Domain mapping and spectroscopy characterized multiple HS-binding domains and a heparin-induced conformational change, and live imaging tied subcellular distribution to growth/differentiation state.","evidence":"Deletion/proteolytic mapping, circular dichroism, plus GFP-fusion live imaging and fractionation in mammary epithelial cells","pmids":["11123893","11803571"],"confidence":"High","gaps":["Trigger that drives nuclear-to-cytoplasmic shift not identified","Relationship between binding domains and ribosomal surface unresolved"]},{"year":2008,"claim":"Mechanistic assays defined how HIP/RPL29 antagonizes growth-factor signaling: displacing HS-bound VEGF/FGF2 and inhibiting heparanase.","evidence":"Tube formation, aortic explant, growth-factor displacement from perlecan, heparanase activity, and receptor phosphorylation assays","pmids":["18980226","12097308"],"confidence":"Medium","gaps":["In vivo relevance of heparanase inhibition not directly shown here","Quantitative contribution of each mechanism to signaling output unclear"]},{"year":2006,"claim":"Knockdown studies placed RPL29 in a pathway opposing differentiation, acting through p21/p53 and maintaining progenitor proliferation.","evidence":"siRNA and ribozyme knockdown with differentiation marker and p21/p53 analysis in colon cancer and multipotent cell lines","pmids":["16475173","12919102"],"confidence":"Medium","gaps":["Direct link between heparin-binding/ribosomal activity and p21/p53 induction not established","Single-lab cell-line models"]},{"year":2012,"claim":"Genetic mouse models demonstrated that RPL29 regulates tumour angiogenesis in vivo, confirming the anti-angiogenic role.","evidence":"Rpl29 heterozygous/null mice, ex vivo aortic ring sprouting, in vivo tumour vessel density, and siRNA depletion","pmids":["23118343"],"confidence":"High","gaps":["Whether ribosomal versus extracellular HIP function drives the angiogenic phenotype is not separated","Direct in vivo VEGF/HS engagement not visualized"]},{"year":2020,"claim":"PAR-CLIP and translation assays revealed feedback autoregulation: eL29 binds the 3' coding region of its own mRNA, mimicking its rRNA site, to inhibit its own synthesis.","evidence":"PAR-CLIP, mRNA co-immunoprecipitation, and cell-free translation inhibition in human cells","pmids":["32798643"],"confidence":"High","gaps":["Physiological conditions triggering autoregulation not defined","Quantitative impact on cellular eL29 levels not measured"]},{"year":2018,"claim":"Identification of Set7/9-dependent Lys5 methylation (reversed by Lsd1) and NMR placement at the exit tunnel added a regulatory PTM controlling localization and a structural sensing role for the nascent chain.","evidence":"Mass spectrometry, methyltransferase/demethylase assays, methyl-specific antibody and inhibitor treatment, plus NMR reconstitution into the 50S subunit","pmids":["29959229","29605910"],"confidence":"High","gaps":["Functional consequence of K5 methylation beyond localization unknown","Whether nascent-chain conformational sensing recruits chaperones in vivo untested"]},{"year":2025,"claim":"A preprint links RPL29 mRNA stability to m6A reading, proposing METTL14/IGF2BP1/3-dependent stabilization as an upstream regulator of RPL29 abundance.","evidence":"eCLIP intersection and 3'-UTR luciferase reporter assays with IGF2BP1/3 and METTL3/14 overexpression (preprint)","pmids":["bio_10.1101_2025.05.04.652102"],"confidence":"Low","gaps":["Preprint, no protein-level mechanistic validation","Direct m6A site on RPL29 mRNA not mapped","Physiological consequence on RPL29 protein levels not shown"]},{"year":null,"claim":"How the dual ribosomal and extracellular heparin-binding functions of RPL29 are coordinated, and which molecular activity drives its differentiation and angiogenesis phenotypes, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism connecting ribosomal assembly role to extracellular HIP function","Trafficking route to the cell membrane unknown","Causal molecular activity behind p21/p53-mediated differentiation control not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[9,18,11]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7,8]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,15]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[9,18]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,20]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[20]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[9,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[16,13]}],"complexes":["60S/50S large ribosomal subunit"],"partners":["RPL10","RSA1","SETD7","KDM1A","HPSE","VEGFA","FGF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P47914","full_name":"Large ribosomal subunit protein eL29","aliases":["60S ribosomal protein L29","Cell surface heparin-binding protein HIP"],"length_aa":159,"mass_kda":17.8,"function":"Component of the large ribosomal subunit (PubMed:12962325, PubMed:23636399, PubMed:32669547). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:12962325, PubMed:23636399, PubMed:32669547)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P47914/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RPL29"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EMC9","stoichiometry":10.0},{"gene":"ENY2","stoichiometry":4.0},{"gene":"IPO5","stoichiometry":4.0},{"gene":"RBM8A","stoichiometry":4.0},{"gene":"SEC61B","stoichiometry":4.0},{"gene":"SRP19","stoichiometry":4.0},{"gene":"SRP72","stoichiometry":4.0},{"gene":"ATG13","stoichiometry":0.2},{"gene":"CAPRIN1","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RPL29","total_profiled":1310},"omim":[{"mim_id":"601832","title":"RIBOSOMAL PROTEIN L29; RPL29","url":"https://www.omim.org/entry/601832"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"},{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPL29"},"hgnc":{"alias_symbol":["HIP","HUMRPL29","L29","eL29"],"prev_symbol":["RPL29P10"]},"alphafold":{"accession":"P47914","domains":[{"cath_id":"-","chopping":"90-118","consensus_level":"medium","plddt":89.24,"start":90,"end":118},{"cath_id":"1.20.5","chopping":"36-79","consensus_level":"medium","plddt":94.6923,"start":36,"end":79}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P47914","model_url":"https://alphafold.ebi.ac.uk/files/AF-P47914-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P47914-F1-predicted_aligned_error_v6.png","plddt_mean":81.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPL29","jax_strain_url":"https://www.jax.org/strain/search?query=RPL29"},"sequence":{"accession":"P47914","fasta_url":"https://rest.uniprot.org/uniprotkb/P47914.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P47914/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P47914"}},"corpus_meta":[{"pmid":"8253806","id":"PMC_8253806","title":"L-29, a soluble lactose-binding lectin, is phosphorylated on serine 6 and serine 12 in vivo and by casein kinase I.","date":"1993","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8253806","citation_count":97,"is_preprint":false},{"pmid":"2104804","id":"PMC_2104804","title":"Characterization of nuclear localizing sequences derived from yeast ribosomal protein L29.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/2104804","citation_count":90,"is_preprint":false},{"pmid":"6170935","id":"PMC_6170935","title":"The use of 2-iminothiolane as an RNA-protein cross-linking agent in Escherichia coli ribosomes, and the localisation on 23S RNA of sites cross-linked to proteins L4, L6, L21, L23, L27 and L29.","date":"1981","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/6170935","citation_count":72,"is_preprint":false},{"pmid":"6285288","id":"PMC_6285288","title":"Molecular cloning and analysis of yeast gene for cycloheximide resistance and ribosomal protein L29.","date":"1982","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/6285288","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":"17195189","id":"PMC_17195189","title":"Global growth deficiencies in mice lacking the ribosomal protein HIP/RPL29.","date":"2007","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/17195189","citation_count":64,"is_preprint":false},{"pmid":"2593000","id":"PMC_2593000","title":"Identified facilitator neurons L29 and L28 are excited by cutaneous stimuli used in dishabituation, sensitization, and classical conditioning of Aplysia.","date":"1989","source":"The Journal of neuroscience : the official journal of the Society for 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Arg→Lys substitution in the proximal NLS greatly reduced ribosome assembly and cell growth, and substitution in both NLS caused a still greater defect, placing these sequences as necessary for both nuclear import and ribosome assembly.\",\n      \"method\": \"Reporter protein fusion, mutagenesis (Arg→Lys substitutions), yeast growth assays, ribosome assembly analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis combined with functional readouts (ribosome assembly, growth) in yeast; multiple orthogonal approaches in one rigorous study\",\n      \"pmids\": [\"2104804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1980,\n      \"finding\": \"A mutation in the structural gene for yeast ribosomal protein L29 confers cycloheximide resistance, demonstrating that L29 is the target of cycloheximide action in the large (60S) ribosomal subunit.\",\n      \"method\": \"Two-dimensional gel electrophoresis of ribosomal proteins, genetic co-segregation analysis in yeast\",\n      \"journal\": \"Current genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical identification of altered protein plus genetic co-segregation, replicated in multiple studies across organisms\",\n      \"pmids\": [\"24189656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1982,\n      \"finding\": \"The yeast cycloheximide resistance gene CYH2 encodes ribosomal protein L29, a component of the large (60S) subunit; the gene is present as a single copy and contains an intervening sequence.\",\n      \"method\": \"Molecular cloning, cross-hybridization, blot hybridization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular cloning with direct gene identification and cross-hybridization, consistent with biochemical mutant data\",\n      \"pmids\": [\"6285288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1981,\n      \"finding\": \"E. coli ribosomal protein L29 is cross-linked to positions 99–107 of 23S rRNA in the 50S subunit, placing L29 in direct contact with this specific rRNA region.\",\n      \"method\": \"RNA-protein cross-linking with 2-iminothiolane followed by UV irradiation; RNA fragment identification\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution/cross-linking assay, single study\",\n      \"pmids\": [\"6170935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"A mutant E. coli lacking ribosomal proteins S17 and L29 was used to localize L29 to the back of the 50S subunit, on the opposite side from the subunit interface, by immunoelectron microscopy.\",\n      \"method\": \"Isolation of deletion mutant, immunological localization on ribosomal surface by electron microscopy\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization using null mutant as control, single study\",\n      \"pmids\": [\"3926498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1984,\n      \"finding\": \"Ribosomal proteins L6 and L29 occupy closely adjacent sites in mammalian 60S subunits and can be cross-linked via intermolecular disulfide bonds; the interacting cysteine of L29 is located approximately 40 residues from its C-terminus.\",\n      \"method\": \"Disulfide cross-linking, S-cleavage after cyanylation, polyacrylamide gel electrophoresis, autoradiography\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct biochemical cross-linking with site localization, single study\",\n      \"pmids\": [\"6468376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"In Bacillus stearothermophilus ribosomes, cross-linking with diepoxybutane identified L23 and L29 as neighboring proteins; the cross-link involved Met-1 of L23 and Lys-4 of L29.\",\n      \"method\": \"Chemical cross-linking with diepoxybutane, protein isolation, sequence analysis and mass spectrometry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro cross-linking with atomic-level site identification, single study\",\n      \"pmids\": [\"8444837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Murine HIP/RPL29 (identical to ribosomal protein L29) is enriched in the 100,000×g particulate (membrane) fraction of mammary epithelial cells and behaves as a peripheral membrane protein (eluted with 0.8 M NaCl); recombinant murine HIP/RPL29 binds heparin directly and selectively compared to other glycosaminoglycans.\",\n      \"method\": \"Cell fractionation, salt extraction, gel overlay binding assay with 125I-heparin, heparin-agarose affinity chromatography with glycosaminoglycan competition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods (fractionation, gel overlay, affinity chromatography) in single rigorous study\",\n      \"pmids\": [\"9737974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Multiple distinct domains of human and murine HIP/RPL29 contribute to heparin/heparan sulfate (Hp/HS) binding; heparin binding induces a conformational change in human HIP/RPL29 detected by circular dichroism spectroscopy.\",\n      \"method\": \"Deletion mutants, proteolytic fragments, protease-protection assays, circular dichroism spectroscopy\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (deletion analysis, proteolysis, CD spectroscopy) identifying binding domains and conformational change\",\n      \"pmids\": [\"11123893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Deletion of yeast RPL29 causes accumulation of half-mer polysomes and impaired 60S-to-40S subunit joining; synthetic lethality with RPL10 (essential for subunit joining) and RSA1 (required for Rpl10 loading onto 60S), and RPL10 over-expression suppresses the half-mer phenotype, placing RPL29 as a facilitator of proper 60S subunit assembly and ribosomal subunit joining.\",\n      \"method\": \"Gene deletion, polysome profiling, in vitro translation, synthetic lethality epistasis analysis, gene over-expression suppression assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis, polysome profiling, and suppression assay in yeast; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"11997090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Mouse ribosomal protein L27' (ortholog of yeast L29) can functionally substitute for yeast L29 in yeast ribosomes (supporting normal growth in L29-null cells), but is outcompeted when yeast L29 is also present, demonstrating evolutionary conservation of ribosomal function.\",\n      \"method\": \"cDNA expression in yeast, cycloheximide sensitivity assay, growth complementation assay in L29-null yeast\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional complementation in vivo with multiple genetic controls\",\n      \"pmids\": [\"2643099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIP/RPL29-null mice are viable but show global growth reduction (~50% smaller), delayed embryonic growth from mid-gestation, decreased proliferation and protein synthesis in embryonic fibroblasts, and reduced steady-state levels of core ribosomal proteins, establishing RPL29 as a regulator of global protein synthesis rate.\",\n      \"method\": \"Gene targeting/knockout mice, phenotypic analysis, cell proliferation assays, protein synthesis measurement, Western blotting for core RPs\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with multiple orthogonal cellular and molecular readouts; definitive in vivo phenotype\",\n      \"pmids\": [\"17195189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Knockdown of HIP/RPL29 by siRNA in LS174T colon cancer cells induces cellular differentiation (upregulation of galectin-4 and mucin-2 markers) accompanied by upregulation of p21 and p53, placing RPL29 in a pathway that suppresses differentiation through p21/p53.\",\n      \"method\": \"siRNA knockdown, marker expression analysis (galectin-4, mucin-2), Western blot for p21/p53\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean siRNA knockdown with defined molecular markers, single lab study\",\n      \"pmids\": [\"16475173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ribozyme-mediated partial knockdown of HIP/RPL29 in C3H/10T(1/2) multipotent cells accelerates differentiation into cartilage-like cells, demonstrating that HIP/RPL29 expression maintains chondrocyte proliferation and opposes differentiation.\",\n      \"method\": \"Ribozyme-mediated knockdown, chondrogenic differentiation assay, histochemical and molecular marker analysis\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional knockdown with defined cellular phenotype, single lab\",\n      \"pmids\": [\"12919102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIP/RPL29 inhibits VEGF- and FGF2-stimulated angiogenesis by displacing HS-bound growth factors from perlecan domain I and antagonizing heparanase (HPSE) activity (inhibiting soluble HS release); partial inhibition of VEGFR2 phosphorylation at Y951 (migration-associated site) was also observed.\",\n      \"method\": \"Endothelial tube formation assay, aortic explant assay, HBGF displacement from HS-bearing perlecan, HPSE activity assay, Western blot for receptor phosphorylation\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal in vitro assays identifying mechanism; single lab\",\n      \"pmids\": [\"18980226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Recombinant HIP/RPL29 inhibits bFGF-induced proliferation of gingival fibroblasts and specifically blocks bFGF stimulation of p44 (Erk-1) MAPK phosphorylation in a dose-dependent manner, without affecting IGF-1 responses, indicating that HIP/RPL29 modulates bFGF bioavailability via HS interactions.\",\n      \"method\": \"Cell proliferation assay, Western blot for MAPK phosphorylation, dose-response analysis with recombinant HIP/RPL29\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple cellular readouts with specificity controls, single lab\",\n      \"pmids\": [\"12097308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RPL29 regulates tumour angiogenesis in vivo: VEGF-stimulated microvessel sprouting is significantly reduced in Rpl29-heterozygous and Rpl29-null aortic ring assays ex vivo, and tumour blood vessel density is reduced in Rpl29-mutant mice bearing Lewis lung carcinomas; siRNA depletion of Rpl29 also inhibits VEGF-induced sprouting.\",\n      \"method\": \"Rpl29 heterozygous/null mouse models, ex vivo aortic ring sprouting assay, in vivo tumour implantation, siRNA knockdown, immunohistochemistry for vessel density\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic and siRNA approaches with in vivo and ex vivo readouts; genetic and RNAi evidence converge\",\n      \"pmids\": [\"23118343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Ribosomal protein RPL29/eL29 is a major substrate of the lysine methyltransferase Set7/9; RPL29 lysine 5 (Rpl29K5) is methylated exclusively by Set7/9 and can be demethylated by Lsd1/Kdm1a. Methylation at K5 does not affect global protein synthesis but alters RPL29 subcellular localization.\",\n      \"method\": \"Mass spectrometry substrate identification, methyltransferase assay with Set7/9 and mutants, methylation-specific antibody validation, Set7/9 inhibitor ((R)-PFI-2) treatment, subcellular localization analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — enzymatic assay identifying writer/eraser, specific antibody validation, pharmacological inhibitor confirmation, localization readout; multiple methods in one rigorous study\",\n      \"pmids\": [\"29959229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Isotopically labeled RPL29 can be reconstituted into the 50S large ribosomal subunit; RPL29 is located at the exit of the polypeptide tunnel of the 50S subunit and can undergo allosteric conformational changes induced by the nascent polypeptide chain, potentially triggering interactions with chaperones (trigger factor or SRP).\",\n      \"method\": \"Isotopic labeling, in vitro reconstitution into 50S subunit, solid-state and solution NMR\",\n      \"journal\": \"Methods in molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — structural NMR reconstitution approach, methodological paper with limited functional validation described in abstract\",\n      \"pmids\": [\"29605910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Human ribosomal protein eL29 (RPL29) binds its own cognate mRNA in cells at the 3' part of the coding sequence (CDS), mimicking its rRNA binding site; overproduced eL29 inhibits translation of the eL29 mRNA CDS transcript in a cell-free system and co-immunoprecipitates with eL29 mRNA from ribosome-depleted lysate, establishing a feedback autoregulation of eL29 synthesis.\",\n      \"method\": \"4-thiouridine-enhanced CLIP (PAR-CLIP) in HEK293T cells, next-generation sequencing, co-immunoprecipitation of mRNA, cell-free translation inhibition assay\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — PAR-CLIP, IP, and in vitro translation assay all converging on same mechanism; multiple orthogonal methods in single study\",\n      \"pmids\": [\"32798643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HIP/RPL29 intracellular distribution shifts between nuclear and cytoplasmic compartments depending on mammary epithelial cell growth/differentiation state (nuclear in proliferating/differentiating cells, cytoplasmic in mature secretory cells), as confirmed by GFP-fusion protein live imaging.\",\n      \"method\": \"Immunohistochemistry, cell fractionation, GFP-fusion protein transfection and live imaging in NMuMG cells\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — immunohistochemistry and live-cell GFP imaging show compartment shift linked to differentiation state; single lab but orthogonal methods\",\n      \"pmids\": [\"11803571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"E. coli ribosomal protein L29 and acyl carrier protein (ACP) together stimulate binding of TnsD to the Tn7 attachment site (attTn7) and stimulate Tn7 transposition in vitro; mutations in L29 drastically decrease Tn7 transposition in vivo specifically for TnsABC+D reactions.\",\n      \"method\": \"In vitro transposition assay, TnsD binding assay, L29 mutant analysis in vivo\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro and in vivo functional assays demonstrating novel non-ribosomal role; single study, E. coli (prokaryotic) protein\",\n      \"pmids\": [\"9755182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RPL29 mRNA is a direct target of IGF2BP1/3 (m6A readers) in a METTL14-dependent manner; luciferase reporter assays showed increased mRNA stability of the RPL29 3'-UTR upon co-expression of IGF2BP1/3 and METTL3/14, indicating that m6A modification promotes IGF2BP1/3-mediated stabilization of RPL29 mRNA.\",\n      \"method\": \"eCLIP data intersection analysis, 3'-UTR luciferase reporter assay, IGF2BP1/3 and METTL3/14 overexpression\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, luciferase reporter assay for mRNA stability, single lab, no direct protein-level mechanistic validation\",\n      \"pmids\": [\"bio_10.1101_2025.05.04.652102\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RPL29/eL29 is a component of the 60S large ribosomal subunit positioned at the polypeptide exit tunnel, where it facilitates subunit joining and modulates the rate of global protein synthesis; it undergoes methylation at Lys5 by Set7/9 (reversible by Lsd1) which controls its subcellular localization, and autoregulates its own translation by binding the coding sequence of its cognate mRNA; outside the ribosome, RPL29/HIP functions as a peripheral membrane heparin/heparan sulfate-binding protein that antagonizes growth factor (VEGF, FGF2) signaling by competing for HS-binding and inhibiting heparanase, thereby regulating angiogenesis and cell differentiation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPL29 (eL29) is a component of the large (60S/50S) ribosomal subunit that facilitates ribosomal subunit assembly and joining and modulates the rate of global protein synthesis [#9, #11]. Within the ribosome it sits at the exit of the polypeptide tunnel, where it can undergo nascent-chain-induced conformational changes [#18], and it contacts neighboring large-subunit proteins and rRNA [#3, #5, #6]. Yeast RPL29 carries internal nuclear-localizing sequences whose basic residues are required for both nuclear import and ribosome assembly [#0], and its loss produces half-mer polysomes reflecting defective 60S subunit joining, genetically linked to the RPL10/RSA1 assembly axis [#9]. Loss of RPL29 in mice causes global growth retardation with reduced proliferation, lowered protein synthesis, and decreased steady-state levels of core ribosomal proteins [#11]. The protein is post-translationally methylated at Lys5 exclusively by Set7/9 and demethylated by Lsd1/Kdm1a, a modification that controls its subcellular localization without altering global translation [#17], and it autoregulates its own synthesis by binding the 3' coding region of its cognate mRNA in a manner mimicking its rRNA contact site [#19]. Beyond the ribosome, RPL29 (HIP) acts as a peripheral membrane heparin/heparan sulfate-binding protein whose multiple binding domains undergo a conformational change upon heparin binding [#7, #8]; through this activity it antagonizes VEGF- and FGF2-driven signaling by displacing growth factors from heparan sulfate and inhibiting heparanase, thereby restraining angiogenesis in vivo and opposing cellular differentiation [#14, #16, #12, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1982,\n      \"claim\": \"Genetic and biochemical work established that the yeast cycloheximide-resistance locus encodes a single-copy large-subunit ribosomal protein, defining L29/RPL29 as a bona fide 60S component and target of cycloheximide.\",\n      \"evidence\": \"2D gel electrophoresis of mutant ribosomal proteins, genetic co-segregation, and molecular cloning of CYH2 in yeast\",\n      \"pmids\": [\"24189656\", \"6285288\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the protein's structural position or assembly function\", \"Mechanism of cycloheximide resistance at the residue level not established\"]\n    },\n    {\n      \"year\": 1985,\n      \"claim\": \"Cross-linking and immunoelectron microscopy positioned the protein on the large subunit surface and its rRNA/protein neighborhood, providing the first structural placement.\",\n      \"evidence\": \"RNA-protein and protein-protein cross-linking and immuno-EM localization in bacterial and mammalian large subunits\",\n      \"pmids\": [\"6170935\", \"3926498\", \"6468376\", \"8444837\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Surface/back placement from EM predates atomic structures and the exit-tunnel assignment\", \"Functional consequence of these contacts not tested\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Mutagenesis showed that internal basic NLS segments are required for both nuclear import and ribosome assembly, linking the protein's localization signals to its assembly role.\",\n      \"evidence\": \"Reporter fusions, Arg→Lys substitutions, ribosome assembly and growth assays in yeast\",\n      \"pmids\": [\"2104804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Import receptor/pathway not identified\", \"How NLS residues mechanistically couple to assembly is unclear\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Cross-species complementation demonstrated functional conservation of the ribosomal role from mammals to yeast.\",\n      \"evidence\": \"Mouse L27'/ortholog cDNA expression rescuing growth in L29-null yeast\",\n      \"pmids\": [\"2643099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Competition by endogenous yeast L29 indicates incomplete equivalence\", \"Does not address non-ribosomal functions\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic deletion in yeast assigned RPL29 a specific role in 60S maturation and subunit joining, situating it on the RPL10/RSA1 assembly axis.\",\n      \"evidence\": \"Gene deletion, polysome profiling (half-mers), synthetic lethality with RPL10/RSA1, and RPL10-overexpression suppression in yeast\",\n      \"pmids\": [\"11997090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular role in joining versus indirect assembly effect not separated\", \"Human equivalence not tested in this study\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"A knockout mouse established RPL29 as a regulator of global protein synthesis rate and organismal growth in mammals.\",\n      \"evidence\": \"Gene-targeted knockout mice with growth, proliferation, protein-synthesis, and core-RP Western blot readouts\",\n      \"pmids\": [\"17195189\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether reduced synthesis reflects assembly defect or other roles not resolved\", \"Tissue-specific contributions not dissected\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of the protein as the heparin-binding HIP revealed a non-ribosomal, peripheral membrane heparin/heparan sulfate-binding activity.\",\n      \"evidence\": \"Cell fractionation, salt extraction, gel-overlay heparin binding, and heparin-agarose affinity chromatography with GAG competition\",\n      \"pmids\": [\"9737974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a ribosomal protein reaches the membrane is unexplained\", \"Physiological partner HS structures not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Domain mapping and spectroscopy characterized multiple HS-binding domains and a heparin-induced conformational change, and live imaging tied subcellular distribution to growth/differentiation state.\",\n      \"evidence\": \"Deletion/proteolytic mapping, circular dichroism, plus GFP-fusion live imaging and fractionation in mammary epithelial cells\",\n      \"pmids\": [\"11123893\", \"11803571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger that drives nuclear-to-cytoplasmic shift not identified\", \"Relationship between binding domains and ribosomal surface unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mechanistic assays defined how HIP/RPL29 antagonizes growth-factor signaling: displacing HS-bound VEGF/FGF2 and inhibiting heparanase.\",\n      \"evidence\": \"Tube formation, aortic explant, growth-factor displacement from perlecan, heparanase activity, and receptor phosphorylation assays\",\n      \"pmids\": [\"18980226\", \"12097308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of heparanase inhibition not directly shown here\", \"Quantitative contribution of each mechanism to signaling output unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Knockdown studies placed RPL29 in a pathway opposing differentiation, acting through p21/p53 and maintaining progenitor proliferation.\",\n      \"evidence\": \"siRNA and ribozyme knockdown with differentiation marker and p21/p53 analysis in colon cancer and multipotent cell lines\",\n      \"pmids\": [\"16475173\", \"12919102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct link between heparin-binding/ribosomal activity and p21/p53 induction not established\", \"Single-lab cell-line models\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genetic mouse models demonstrated that RPL29 regulates tumour angiogenesis in vivo, confirming the anti-angiogenic role.\",\n      \"evidence\": \"Rpl29 heterozygous/null mice, ex vivo aortic ring sprouting, in vivo tumour vessel density, and siRNA depletion\",\n      \"pmids\": [\"23118343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ribosomal versus extracellular HIP function drives the angiogenic phenotype is not separated\", \"Direct in vivo VEGF/HS engagement not visualized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"PAR-CLIP and translation assays revealed feedback autoregulation: eL29 binds the 3' coding region of its own mRNA, mimicking its rRNA site, to inhibit its own synthesis.\",\n      \"evidence\": \"PAR-CLIP, mRNA co-immunoprecipitation, and cell-free translation inhibition in human cells\",\n      \"pmids\": [\"32798643\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions triggering autoregulation not defined\", \"Quantitative impact on cellular eL29 levels not measured\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of Set7/9-dependent Lys5 methylation (reversed by Lsd1) and NMR placement at the exit tunnel added a regulatory PTM controlling localization and a structural sensing role for the nascent chain.\",\n      \"evidence\": \"Mass spectrometry, methyltransferase/demethylase assays, methyl-specific antibody and inhibitor treatment, plus NMR reconstitution into the 50S subunit\",\n      \"pmids\": [\"29959229\", \"29605910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of K5 methylation beyond localization unknown\", \"Whether nascent-chain conformational sensing recruits chaperones in vivo untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A preprint links RPL29 mRNA stability to m6A reading, proposing METTL14/IGF2BP1/3-dependent stabilization as an upstream regulator of RPL29 abundance.\",\n      \"evidence\": \"eCLIP intersection and 3'-UTR luciferase reporter assays with IGF2BP1/3 and METTL3/14 overexpression (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.05.04.652102\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, no protein-level mechanistic validation\", \"Direct m6A site on RPL29 mRNA not mapped\", \"Physiological consequence on RPL29 protein levels not shown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dual ribosomal and extracellular heparin-binding functions of RPL29 are coordinated, and which molecular activity drives its differentiation and angiogenesis phenotypes, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism connecting ribosomal assembly role to extracellular HIP function\", \"Trafficking route to the cell membrane unknown\", \"Causal molecular activity behind p21/p53-mediated differentiation control not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [9, 18, 11]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [9, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [16, 13]}\n    ],\n    \"complexes\": [\"60S/50S large ribosomal subunit\"],\n    \"partners\": [\"RPL10\", \"RSA1\", \"SETD7\", \"KDM1A\", \"HPSE\", \"VEGFA\", \"FGF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}