{"gene":"HBS1L","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2010,"finding":"Dom34:Hbs1 (yeast ortholog of PELO:HBS1L) interacts with stalled ribosomes to promote ribosomal subunit dissociation and peptidyl-tRNA drop-off, initiating no-go decay (NGD). This activity is shared with the translation termination factor complex eRF1:eRF3, and is independent of peptide length or A-site codon identity.","method":"Reconstituted yeast translation system (in vitro ribosome dissociation and peptidyl-tRNA drop-off assays)","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified components, mechanistic activity directly demonstrated with functional assay","pmids":["20947765"],"is_preprint":false},{"year":2010,"finding":"Hbs1 (yeast) structure was determined with and without GDP, and a low-resolution model of the Dom34-Hbs1 complex was obtained. The complex mimics elongation factor-tRNA or eRF1-eRF3 complexes, supporting binding to the ribosomal A-site. Nucleotide (GTP/GDP) binding by Hbs1 is essential for both NGD and 18S NRD. Dom34-Hbs1 interaction is essential for NGD but largely dispensable for 18S NRD, genetically uncoupling the two pathways.","method":"Crystal structure of Hbs1 ± GDP; low-resolution model of Dom34-Hbs1 complex; site-directed mutagenesis of Hbs1 nucleotide-binding and Dom34-interaction surfaces; in vivo NGD and 18S NRD reporter assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional in vivo assays in single rigorous study","pmids":["21102444"],"is_preprint":false},{"year":2013,"finding":"Mammalian Hbs1L and its binding partner Dom34/PELOTA are required for non-stop mRNA decay (NSD) in mammalian cells. Hbs1L-Dom34 forms a complex with the exosome-SKI complex (Ski2/Mtr4 and Dis3). Elimination of aberrant proteins from non-stop transcripts additionally requires the RING finger E3 ligase listerin.","method":"Non-stop mRNA reporter degradation assays in mammalian cells; Co-immunoprecipitation of Hbs1-Dom34 with Ski2/Mtr4/Dis3; siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional reporter assays in mammalian cells, single lab with two orthogonal methods","pmids":["23667253"],"is_preprint":false},{"year":2014,"finding":"The Dom34-Hbs1 complex, together with the Rli1/ABCE1 NTPase, dissociates inactive (non-translating) 80S ribosomes stabilized by the Stm1 clamping factor in glucose-starved yeast, thereby facilitating translation restart upon stress relief. This role in splitting inactive ribosomes occurs both during stress and in growing yeast.","method":"In vitro ribosome dissociation assays; in vivo polysome profiling and translation restart assays in yeast; glucose starvation model","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution combined with in vivo polysome profiling, single lab with two orthogonal methods","pmids":["24424461"],"is_preprint":false},{"year":2012,"finding":"Dom34:Hbs1 (yeast) is required to release nonstop proteins stuck in the ER translocon (Sec61 complex) and the mitochondrial translocon (TOM40 complex). By rescuing stalled ribosomes at these organellar translocators, Dom34:Hbs1 clears the channels and restores normal protein import into organelles.","method":"Yeast genetic experiments; nonstop mRNA reporter constructs targeting ER or mitochondria; cell fractionation; dom34/hbs1 deletion strains","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with nonstop reporters in defined deletion strains, two organelle systems tested","pmids":["22981232"],"is_preprint":false},{"year":2017,"finding":"A short splicing isoform of HBS1L (HBS1LV3/SKI7) is the functional equivalent of yeast Ski7, linking the cytoplasmic exosome and SKI complexes in humans. The canonical isoform HBS1LV1 associates with PELOTA (Dom34) for ribosome rescue but does not bind the exosome. Both isoforms bind the SKI complex, and HBS1LV1 antagonizes SKI/exosome supercomplex formation. The C-terminal RxxxFxxxL motif of HBS1LV3 mediates exosome binding, interacting with exosome core subunit RRP43.","method":"Proteomic/mass spectrometry analysis of HBS1L isoform complexes; Co-immunoprecipitation; siRNA depletion; mRNA half-life measurements; transcriptome analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, proteomics, half-life measurements, and domain-level mutant analysis in single study; identifies functionally distinct isoforms","pmids":["28204585"],"is_preprint":false},{"year":1998,"finding":"Human eRFS (HBS1L) encodes a GTP-binding protein whose C-terminal domain shares structural features with eEF-1A and eRF3. Phylogenetically, HBS1L and yeast Hbs1p form a cluster branching with the eRF3 family. However, human HBS1L does not complement yeast eRF3/Sup35p thermosensitive mutations and does not interact with eRF1 in yeast — it does not carry eRF3-like translation termination activity.","method":"cDNA cloning; phylogenetic analysis; yeast complementation assay; yeast two-hybrid","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct yeast complementation and two-hybrid experiments; negative result for eRF3 activity is mechanistically informative","pmids":["9872408"],"is_preprint":false},{"year":2019,"finding":"Loss of HBS1L in human patient cells causes accumulation of 80S monosomes, increased translation efficiency of ribosomal RNA, upregulation of mTOR and 4-EBP protein expression, and depletion of PELOTA protein at the post-translational level (rescued by proteasome inhibition). An Hbs1l knockdown mouse model recapitulates facial dysmorphism, growth restriction, retinal deposits, and reduced Pelota levels.","method":"Patient cell lines with biallelic HBS1L mutation; polysome profiling; Western blot; RT-PCR; ribosome sequencing; proteasome inhibition rescue experiment; mouse Hbs1l knockdown model","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (polysome profiling, proteasome rescue, mouse model) in single study with human patient cells and mouse model","pmids":["30707697"],"is_preprint":false},{"year":2015,"finding":"The Pelo (Dom34)-Hbs1 mRNA surveillance complex is required for transposon silencing in the Drosophila germline. Pelo functions at the translational level to silence TEs; this function requires interaction with Hbs1. Overexpression of RpS30a (a ribosomal protein) partially rescues TE-silencing defects in pelo mutants. PiRNA biogenesis is not affected by Pelo loss.","method":"Drosophila pelo and hbs1 mutant analysis; TE mRNA/protein quantification; genetic epistasis (RpS30a overexpression rescue); piRNA sequencing","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and loss-of-function in Drosophila with multiple readouts, single lab","pmids":["26124316"],"is_preprint":false},{"year":2019,"finding":"Drosophila Hbs1 is required for spermatogenesis: hbs1 mutant males are sterile due to defects in meiosis and spermatid individualization. Hbs1 genetically interacts with pelota during spermatid individualization, and a point mutation in Pelota's Hbs1-binding site abolishes rescue of spermatogenesis, demonstrating the Pelota-Hbs1 complex is functionally required for this process.","method":"Drosophila hbs1 loss-of-function mutants; fertility assays; genetic interaction analysis with pelota hypomorphs; Pelota binding-site point mutant rescue experiment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with point-mutation rescue, single lab","pmids":["30824860"],"is_preprint":false},{"year":2023,"finding":"In C. elegans, the ribosome rescue factor HBS-1 (HBS1L ortholog) is required for No-Go mRNA Decay (NGD). Ubiquitination of ribosomal proteins eS10 and uS10 is functionally required for NGD. HBS-1 and PELO-1 act downstream of the ubiquitin ligase ZNF-598 and are required for mRNA decay via the nuclease NONU-1.","method":"C. elegans forward and reverse genetics; novel NGD reporter; ribosomal ubiquitination site mutations; epistasis analysis of ZNF-598, HBS-1, PELO-1, NONU-1","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple pathway components in C. elegans, single lab","pmids":["36626369"],"is_preprint":false},{"year":2024,"finding":"Loss of HBS1L causes retinal dystrophy in both a human patient and in Hbs1ltm1a/tm1a hypomorph mice, characterized by photoreceptor apoptosis and outer retinal thinning. Proteomic analysis revealed 480 downregulated proteins including rhodopsin, peripherin-2, and EDF1 (a ribosome collision sensor), as well as PELOTA. These findings establish HBS1L's ribosomal rescue function as essential for photoreceptor cell maintenance.","method":"Human patient clinical data (ERG); Hbs1ltm1a/tm1a mouse model; OCT imaging; TUNEL assay; mass spectrometry proteomics; GSEA/GO analysis","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combined human patient and mouse model with proteomics, single study","pmids":["38966981"],"is_preprint":false},{"year":2025,"finding":"HBS1L is synthetic lethal with FOCAD loss in cancer cells. Mechanistically, HBS1L loss in FOCAD-deleted cells leads to translational arrest and activation of the unfolded protein response (UPR). The FOCAD/SKI complex and HBS1L/PELO complex work together to resolve aberrant mRNA-induced ribosomal stalling. In vivo, HBS1L deletion eliminated growth of FOCAD-deleted tumors.","method":"Combinatorial CRISPR screen; genome-wide CRISPR screen in FOCAD isogenic cells; FOCAD re-expression rescue; orthogonal HBS1L manipulation; UPR/translational arrest readouts; xenograft mouse model","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via CRISPR screens with isogenic rescue and in vivo validation, single study","pmids":["41101730"],"is_preprint":false},{"year":2026,"finding":"TNG961, a molecular glue degrader, promotes HBS1L-CRBN-compound complex formation and induces E3 ligase (cereblon)-dependent HBS1L ubiquitination and degradation. HBS1L degradation disrupts the HBS1L/PELO ribosome-rescue complex, causing translational arrest and UPR activation selectively in FOCAD-negative cancer cells. Cryo-EM structures guided compound optimization.","method":"Cryo-EM structural determination of HBS1L-CRBN-compound complex; in vitro ubiquitination assay; proteome selectivity profiling; cell viability assays; xenograft mouse model with oral TNG961 administration","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with in vitro ubiquitination, cellular mechanistic assays, and in vivo validation","pmids":["42001523"],"is_preprint":false},{"year":2026,"finding":"The N-terminal UBAh domain of HBS1L (shared by both HBS1L and SKI7 isoforms) adopts a three-helix bundle architecture and directly binds ubiquitin via its hydrophobic patch interacting with the Ile44-centered hydrophobic patch of ubiquitin (Kd ~50 µM), with a distinctive double β-turn in the α1/α2 loop accommodating the ubiquitin β-turn. The hallmark VLGD/E motif was identified. This interaction suggests HBS1L and SKI7 are recruited to ubiquitinated stalled ribosomes via UBAh.","method":"NMR structure of mouse UBAh-ubiquitin complex; HSQC titration experiments; dissociation constant measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional binding validation by HSQC titration in single rigorous study","pmids":["42234679"],"is_preprint":false},{"year":2025,"finding":"In Drosophila, loss of Hbs1 (HBS1L ortholog) reduces expression of the stress-responsive transcription factor ATF4, which is encoded by an mRNA with multiple upstream open reading frames (uORFs). In human cells, HBS1L and PELOTA promote translation reinitiation at the ATF4 ORF by facilitating proper translation termination at preceding uORFs. Loss of Hbs1 in Drosophila lamina neurons causes visual defects (ERG abnormalities) and vacuolization/synapse defects; restoring ATF4 in lamina neurons partially rescues ERG defects.","method":"Drosophila Hbs1 loss-of-function mutants; ERG assays; confocal microscopy; human cell knockdown; ATF4 translation reporter assays; neuronal-specific rescue experiments","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with rescue in Drosophila and human cell mechanistic validation, preprint, single lab","pmids":["41279977"],"is_preprint":true},{"year":2023,"finding":"Knockdown of HBS1L (all known isoforms) using shRNA in erythroid progenitors from β0-thalassemia/HbE patients upregulates γ-globin mRNA (~1.69-fold) and increases fetal hemoglobin percentage (~16.7-fold), with only modest perturbation of red cell differentiation, establishing a direct functional role for HBS1L protein in erythroid globin regulation.","method":"Lentiviral shRNA knockdown of HBS1L in primary β0-thalassemia/HbE erythroid progenitors; RT-qPCR for globin mRNAs; HbF quantification; flow cytometry for erythroid differentiation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct loss-of-function in primary patient cells with multiple readouts, single lab","pmids":["36888630"],"is_preprint":false}],"current_model":"HBS1L encodes a translational GTPase that, as the canonical long isoform (HBS1LV1), forms a complex with PELOTA/Dom34 to recognize and rescue stalled ribosomes — promoting ribosomal subunit dissociation, peptidyl-tRNA drop-off, and initiating mRNA quality control pathways (no-go decay, non-stop decay); a short splice isoform (HBS1LV3/SKI7) instead bridges the cytoplasmic RNA exosome and SKI complex for 3'→5' mRNA degradation; the shared N-terminal UBAh domain binds ubiquitin on stalled ribosomes to direct these complexes; loss of HBS1L depletes PELOTA (via proteasomal degradation), causes 80S monosome accumulation, activates mTOR/UPR, and produces developmental anomalies including retinal dystrophy, with additional roles in ATF4 translational reinitiation and, in erythroid cells, regulation of fetal hemoglobin production."},"narrative":{"mechanistic_narrative":"HBS1L is a translational GTPase that, together with its partner PELOTA (Dom34), recognizes and rescues stalled ribosomes to initiate mRNA surveillance pathways [PMID:20947765, PMID:23667253]. The complex binds the ribosomal A-site in a manner that structurally mimics elongation factor-tRNA and eRF1-eRF3 termination complexes, and its nucleotide (GTP/GDP) binding drives ribosomal subunit dissociation and peptidyl-tRNA drop-off during no-go decay and 18S non-functional rRNA decay [PMID:20947765, PMID:21102444]; the Dom34-Hbs1 interaction is required for no-go decay but dispensable for 18S NRD, genetically uncoupling these activities [PMID:21102444]. HBS1L-mediated rescue acts downstream of ribosomal protein ubiquitination by ZNF-598 and feeds stalled transcripts into decay by the nuclease NONU-1 [PMID:36626369], and the shared N-terminal UBAh domain directly binds ubiquitin via its hydrophobic patch, providing the molecular basis for recruitment to ubiquitinated stalled ribosomes [PMID:42234679]. Beyond no-go decay, HBS1L drives non-stop decay through a complex with the exosome and SKI machinery, with a short splice isoform (HBS1LV3/SKI7) bridging the cytoplasmic exosome (via its C-terminal RxxxFxxxL motif contacting RRP43) while the canonical PELOTA-binding isoform does not bind the exosome and antagonizes SKI/exosome supercomplex formation [PMID:23667253, PMID:28204585]. The complex also splits inactive non-translating 80S ribosomes together with ABCE1 to enable translation restart after stress [PMID:24424461]. Loss of HBS1L destabilizes PELOTA post-translationally via proteasomal degradation, causes 80S monosome accumulation, and activates mTOR and the unfolded protein response [PMID:30707697, PMID:41101730]. These functions are essential in vivo: biallelic HBS1L loss causes developmental anomalies and retinal dystrophy with photoreceptor apoptosis in humans and mice [PMID:30707697, PMID:38966981], HBS1L is synthetic lethal with FOCAD loss in cancer and is the target of a cereblon-recruiting molecular glue degrader (TNG961) that triggers translational arrest and UPR in FOCAD-negative cells [PMID:41101730, PMID:42001523], and HBS1L knockdown in erythroid progenitors upregulates fetal hemoglobin [PMID:36888630].","teleology":[{"year":2010,"claim":"Establishing the core biochemical activity: whether the Dom34:Hbs1 complex actively dissociates stalled ribosomes rather than merely binding them, and how this relates to canonical termination.","evidence":"Reconstituted yeast translation system with in vitro ribosome dissociation and peptidyl-tRNA drop-off assays; crystal structure of Hbs1 ± GDP with low-resolution Dom34-Hbs1 model and mutagenesis","pmids":["20947765","21102444"],"confidence":"High","gaps":["Done in yeast components; direct demonstration with human HBS1L not shown here","How stalled ribosomes are initially distinguished from elongating ones at the A-site not resolved"]},{"year":2012,"claim":"Extended ribosome rescue to organellar translocons, showing Dom34:Hbs1 clears ribosomes stalled at the ER (Sec61) and mitochondrial (TOM40) import channels.","evidence":"Yeast deletion strains with nonstop reporters targeted to ER or mitochondria; cell fractionation","pmids":["22981232"],"confidence":"Medium","gaps":["Conducted in yeast; mammalian organellar rescue not directly tested","Does not establish physical contact between the complex and translocon components"]},{"year":2013,"claim":"Demonstrated the mammalian complex requirement and its physical coupling to degradation machinery in non-stop decay.","evidence":"Non-stop reporter degradation assays, Co-IP of Hbs1-Dom34 with Ski2/Mtr4/Dis3, and siRNA knockdown in mammalian cells","pmids":["23667253"],"confidence":"Medium","gaps":["Co-IP does not define direct vs indirect contacts within the exosome-SKI assembly","Isoform-specific contributions not resolved at this stage"]},{"year":2014,"claim":"Showed the complex acts on inactive monosomes beyond aberrant transcripts, splitting Stm1-clamped 80S ribosomes with ABCE1 to permit translation restart.","evidence":"In vitro ribosome dissociation assays plus in vivo polysome profiling and glucose-starvation restart assays in yeast","pmids":["24424461"],"confidence":"High","gaps":["Stm1-dependent mechanism described in yeast; mammalian equivalent not addressed","Trigger that recruits the complex to inactive ribosomes during stress unclear"]},{"year":2017,"claim":"Resolved the isoform logic: a short HBS1L splice product (SKI7/HBS1LV3) handles exosome bridging while the canonical isoform handles PELOTA-dependent rescue, defining division of labor in human cells.","evidence":"Proteomics, reciprocal Co-IP, mRNA half-life measurements, and domain mutant (RxxxFxxxL/RRP43) analysis","pmids":["28204585"],"confidence":"High","gaps":["Regulation of isoform splicing not addressed","Structural basis of HBS1LV1 antagonism of supercomplex formation not resolved"]},{"year":2019,"claim":"Defined the cellular consequences of HBS1L loss in mammals: monosome accumulation, PELOTA destabilization via the proteasome, and mTOR/translation dysregulation linked to disease.","evidence":"Patient cells with biallelic mutation, polysome profiling, ribosome sequencing, proteasome rescue, and Hbs1l knockdown mouse model","pmids":["30707697"],"confidence":"High","gaps":["Mechanism linking HBS1L loss to mTOR/4-EBP upregulation not defined","How PELOTA is targeted for proteasomal degradation in HBS1L absence unknown"]},{"year":2023,"claim":"Placed HBS1L in the ubiquitin-initiated no-go decay pathway, downstream of ZNF-598 ribosomal ubiquitination and upstream of NONU-1 nuclease cleavage.","evidence":"C. elegans forward/reverse genetics, NGD reporter, ribosomal ubiquitination site mutations, and epistasis of ZNF-598/HBS-1/PELO-1/NONU-1","pmids":["36626369"],"confidence":"Medium","gaps":["Direct biochemical link between ubiquitinated ribosome and HBS-1 recruitment not shown in this study","Pathway order inferred from genetics, not reconstitution"]},{"year":2023,"claim":"Identified a translation-surveillance-independent application: HBS1L knockdown raises fetal hemoglobin in thalassemic erythroid progenitors, implicating it in globin regulation.","evidence":"Lentiviral shRNA knockdown in primary β0-thalassemia/HbE erythroid progenitors with RT-qPCR, HbF quantification, and flow cytometry","pmids":["36888630"],"confidence":"Medium","gaps":["Molecular mechanism connecting HBS1L to γ-globin induction unknown","Whether effect is via ribosome rescue or another route untested"]},{"year":2024,"claim":"Established HBS1L ribosome rescue as essential for photoreceptor maintenance, defining the retinal dystrophy phenotype mechanistically.","evidence":"Human patient ERG data, Hbs1l hypomorph mouse, OCT, TUNEL, and mass-spectrometry proteomics","pmids":["38966981"],"confidence":"Medium","gaps":["Causal chain from rescue failure to photoreceptor apoptosis not dissected","Why photoreceptors are selectively vulnerable unexplained"]},{"year":2025,"claim":"Revealed a synthetic-lethal dependency with FOCAD and exploited it pharmacologically, showing HBS1L/PELO and FOCAD/SKI cooperate to resolve ribosomal stalling.","evidence":"Combinatorial and genome-wide CRISPR screens with FOCAD isogenic rescue and xenografts; cryo-EM-guided molecular glue degrader (TNG961) with in vitro ubiquitination and in vivo dosing","pmids":["41101730","42001523"],"confidence":"High","gaps":["Precise molecular interplay between FOCAD/SKI and HBS1L/PELO complexes not fully defined","Resistance mechanisms to degrader-induced rescue loss unaddressed"]},{"year":2026,"claim":"Provided the structural basis for recruitment: the shared N-terminal UBAh domain binds ubiquitin via the Ile44 patch, explaining how both HBS1L and SKI7 are directed to ubiquitinated stalled ribosomes.","evidence":"NMR structure of mouse UBAh-ubiquitin complex with HSQC titration and Kd measurement","pmids":["42234679"],"confidence":"High","gaps":["Low-affinity interaction (Kd ~50 µM); in vivo requirement of UBAh-ubiquitin binding for rescue not demonstrated here","Specificity for particular ubiquitin chain types or ribosomal substrates unknown"]},{"year":null,"claim":"How HBS1L's molecular surveillance function connects to its tissue-specific physiological roles (fetal hemoglobin regulation, ATF4 reinitiation, neuronal/retinal maintenance) remains mechanistically unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified mechanism linking ribosome rescue defects to globin switching","ATF4 reinitiation role rests on a preprint and awaits peer-reviewed confirmation","Direct demonstration that UBAh-ubiquitin recruitment operates in each physiological context lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,3,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,3,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,5]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[7,12]}],"complexes":["PELOTA-HBS1L ribosome rescue complex","SKI complex","cytoplasmic RNA exosome (via SKI7/HBS1LV3)"],"partners":["PELO","ABCE1","DIS3","MTREX","SKIV2L","EXOSC8","FOCAD","CRBN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y450","full_name":"HBS1-like protein","aliases":["ERFS"],"length_aa":684,"mass_kda":75.5,"function":"GTPase component of the Pelota-HBS1L complex, a complex that recognizes stalled ribosomes and triggers the No-Go Decay (NGD) pathway (PubMed:21448132, PubMed:23667253, PubMed:27863242). The Pelota-HBS1L complex recognizes ribosomes stalled at the 3' end of an mRNA and engages stalled ribosomes by destabilizing mRNA in the mRNA channel (PubMed:27863242). Following mRNA extraction from stalled ribosomes by the SKI complex, the Pelota-HBS1L complex promotes recruitment of ABCE1, which drives the disassembly of stalled ribosomes, followed by degradation of damaged mRNAs as part of the NGD pathway (PubMed:21448132, PubMed:32006463)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y450/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HBS1L","classification":"Not Classified","n_dependent_lines":128,"n_total_lines":1208,"dependency_fraction":0.10596026490066225},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RPS16","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HBS1L","total_profiled":1310},"omim":[{"mim_id":"614645","title":"MEAN PLATELET VOLUME/COUNT QUANTITATIVE TRAIT LOCUS 5; MPVCQTL5","url":"https://www.omim.org/entry/614645"},{"mim_id":"612450","title":"HBS1-LIKE PROTEIN; HBS1L","url":"https://www.omim.org/entry/612450"},{"mim_id":"609319","title":"HEMATOCRIT/HEMOGLOBIN QUANTITATIVE TRAIT LOCUS 1; HCHGQ1","url":"https://www.omim.org/entry/609319"},{"mim_id":"603903","title":"SICKLE CELL DISEASE","url":"https://www.omim.org/entry/603903"},{"mim_id":"142470","title":"FETAL HEMOGLOBIN QUANTITATIVE TRAIT LOCUS 2; HBFQTL2","url":"https://www.omim.org/entry/142470"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HBS1L"},"hgnc":{"alias_symbol":["ERFS","HBS1","HSPC276","KIAA1038","DKFZp434g247","EF-1a","eRF3c"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y450","domains":[{"cath_id":"1.10.8.10","chopping":"77-119","consensus_level":"high","plddt":84.8919,"start":77,"end":119},{"cath_id":"3.40.50.300","chopping":"258-475","consensus_level":"high","plddt":88.6049,"start":258,"end":475},{"cath_id":"2.40.30.10","chopping":"488-568","consensus_level":"high","plddt":88.3852,"start":488,"end":568},{"cath_id":"2.40.30.10","chopping":"576-682","consensus_level":"high","plddt":90.5691,"start":576,"end":682}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y450","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y450-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y450-F1-predicted_aligned_error_v6.png","plddt_mean":74.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HBS1L","jax_strain_url":"https://www.jax.org/strain/search?query=HBS1L"},"sequence":{"accession":"Q9Y450","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y450.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y450/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y450"}},"corpus_meta":[{"pmid":"18667698","id":"PMC_18667698","title":"DNA 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This activity is shared with the translation termination factor complex eRF1:eRF3, and is independent of peptide length or A-site codon identity.\",\n      \"method\": \"Reconstituted yeast translation system (in vitro ribosome dissociation and peptidyl-tRNA drop-off assays)\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified components, mechanistic activity directly demonstrated with functional assay\",\n      \"pmids\": [\"20947765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Hbs1 (yeast) structure was determined with and without GDP, and a low-resolution model of the Dom34-Hbs1 complex was obtained. The complex mimics elongation factor-tRNA or eRF1-eRF3 complexes, supporting binding to the ribosomal A-site. Nucleotide (GTP/GDP) binding by Hbs1 is essential for both NGD and 18S NRD. Dom34-Hbs1 interaction is essential for NGD but largely dispensable for 18S NRD, genetically uncoupling the two pathways.\",\n      \"method\": \"Crystal structure of Hbs1 ± GDP; low-resolution model of Dom34-Hbs1 complex; site-directed mutagenesis of Hbs1 nucleotide-binding and Dom34-interaction surfaces; in vivo NGD and 18S NRD reporter assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional in vivo assays in single rigorous study\",\n      \"pmids\": [\"21102444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mammalian Hbs1L and its binding partner Dom34/PELOTA are required for non-stop mRNA decay (NSD) in mammalian cells. Hbs1L-Dom34 forms a complex with the exosome-SKI complex (Ski2/Mtr4 and Dis3). Elimination of aberrant proteins from non-stop transcripts additionally requires the RING finger E3 ligase listerin.\",\n      \"method\": \"Non-stop mRNA reporter degradation assays in mammalian cells; Co-immunoprecipitation of Hbs1-Dom34 with Ski2/Mtr4/Dis3; siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional reporter assays in mammalian cells, single lab with two orthogonal methods\",\n      \"pmids\": [\"23667253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The Dom34-Hbs1 complex, together with the Rli1/ABCE1 NTPase, dissociates inactive (non-translating) 80S ribosomes stabilized by the Stm1 clamping factor in glucose-starved yeast, thereby facilitating translation restart upon stress relief. This role in splitting inactive ribosomes occurs both during stress and in growing yeast.\",\n      \"method\": \"In vitro ribosome dissociation assays; in vivo polysome profiling and translation restart assays in yeast; glucose starvation model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution combined with in vivo polysome profiling, single lab with two orthogonal methods\",\n      \"pmids\": [\"24424461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Dom34:Hbs1 (yeast) is required to release nonstop proteins stuck in the ER translocon (Sec61 complex) and the mitochondrial translocon (TOM40 complex). By rescuing stalled ribosomes at these organellar translocators, Dom34:Hbs1 clears the channels and restores normal protein import into organelles.\",\n      \"method\": \"Yeast genetic experiments; nonstop mRNA reporter constructs targeting ER or mitochondria; cell fractionation; dom34/hbs1 deletion strains\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with nonstop reporters in defined deletion strains, two organelle systems tested\",\n      \"pmids\": [\"22981232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A short splicing isoform of HBS1L (HBS1LV3/SKI7) is the functional equivalent of yeast Ski7, linking the cytoplasmic exosome and SKI complexes in humans. The canonical isoform HBS1LV1 associates with PELOTA (Dom34) for ribosome rescue but does not bind the exosome. Both isoforms bind the SKI complex, and HBS1LV1 antagonizes SKI/exosome supercomplex formation. The C-terminal RxxxFxxxL motif of HBS1LV3 mediates exosome binding, interacting with exosome core subunit RRP43.\",\n      \"method\": \"Proteomic/mass spectrometry analysis of HBS1L isoform complexes; Co-immunoprecipitation; siRNA depletion; mRNA half-life measurements; transcriptome analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, proteomics, half-life measurements, and domain-level mutant analysis in single study; identifies functionally distinct isoforms\",\n      \"pmids\": [\"28204585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human eRFS (HBS1L) encodes a GTP-binding protein whose C-terminal domain shares structural features with eEF-1A and eRF3. Phylogenetically, HBS1L and yeast Hbs1p form a cluster branching with the eRF3 family. However, human HBS1L does not complement yeast eRF3/Sup35p thermosensitive mutations and does not interact with eRF1 in yeast — it does not carry eRF3-like translation termination activity.\",\n      \"method\": \"cDNA cloning; phylogenetic analysis; yeast complementation assay; yeast two-hybrid\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct yeast complementation and two-hybrid experiments; negative result for eRF3 activity is mechanistically informative\",\n      \"pmids\": [\"9872408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of HBS1L in human patient cells causes accumulation of 80S monosomes, increased translation efficiency of ribosomal RNA, upregulation of mTOR and 4-EBP protein expression, and depletion of PELOTA protein at the post-translational level (rescued by proteasome inhibition). An Hbs1l knockdown mouse model recapitulates facial dysmorphism, growth restriction, retinal deposits, and reduced Pelota levels.\",\n      \"method\": \"Patient cell lines with biallelic HBS1L mutation; polysome profiling; Western blot; RT-PCR; ribosome sequencing; proteasome inhibition rescue experiment; mouse Hbs1l knockdown model\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (polysome profiling, proteasome rescue, mouse model) in single study with human patient cells and mouse model\",\n      \"pmids\": [\"30707697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The Pelo (Dom34)-Hbs1 mRNA surveillance complex is required for transposon silencing in the Drosophila germline. Pelo functions at the translational level to silence TEs; this function requires interaction with Hbs1. Overexpression of RpS30a (a ribosomal protein) partially rescues TE-silencing defects in pelo mutants. PiRNA biogenesis is not affected by Pelo loss.\",\n      \"method\": \"Drosophila pelo and hbs1 mutant analysis; TE mRNA/protein quantification; genetic epistasis (RpS30a overexpression rescue); piRNA sequencing\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and loss-of-function in Drosophila with multiple readouts, single lab\",\n      \"pmids\": [\"26124316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Drosophila Hbs1 is required for spermatogenesis: hbs1 mutant males are sterile due to defects in meiosis and spermatid individualization. Hbs1 genetically interacts with pelota during spermatid individualization, and a point mutation in Pelota's Hbs1-binding site abolishes rescue of spermatogenesis, demonstrating the Pelota-Hbs1 complex is functionally required for this process.\",\n      \"method\": \"Drosophila hbs1 loss-of-function mutants; fertility assays; genetic interaction analysis with pelota hypomorphs; Pelota binding-site point mutant rescue experiment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with point-mutation rescue, single lab\",\n      \"pmids\": [\"30824860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In C. elegans, the ribosome rescue factor HBS-1 (HBS1L ortholog) is required for No-Go mRNA Decay (NGD). Ubiquitination of ribosomal proteins eS10 and uS10 is functionally required for NGD. HBS-1 and PELO-1 act downstream of the ubiquitin ligase ZNF-598 and are required for mRNA decay via the nuclease NONU-1.\",\n      \"method\": \"C. elegans forward and reverse genetics; novel NGD reporter; ribosomal ubiquitination site mutations; epistasis analysis of ZNF-598, HBS-1, PELO-1, NONU-1\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple pathway components in C. elegans, single lab\",\n      \"pmids\": [\"36626369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of HBS1L causes retinal dystrophy in both a human patient and in Hbs1ltm1a/tm1a hypomorph mice, characterized by photoreceptor apoptosis and outer retinal thinning. Proteomic analysis revealed 480 downregulated proteins including rhodopsin, peripherin-2, and EDF1 (a ribosome collision sensor), as well as PELOTA. These findings establish HBS1L's ribosomal rescue function as essential for photoreceptor cell maintenance.\",\n      \"method\": \"Human patient clinical data (ERG); Hbs1ltm1a/tm1a mouse model; OCT imaging; TUNEL assay; mass spectrometry proteomics; GSEA/GO analysis\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combined human patient and mouse model with proteomics, single study\",\n      \"pmids\": [\"38966981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HBS1L is synthetic lethal with FOCAD loss in cancer cells. Mechanistically, HBS1L loss in FOCAD-deleted cells leads to translational arrest and activation of the unfolded protein response (UPR). The FOCAD/SKI complex and HBS1L/PELO complex work together to resolve aberrant mRNA-induced ribosomal stalling. In vivo, HBS1L deletion eliminated growth of FOCAD-deleted tumors.\",\n      \"method\": \"Combinatorial CRISPR screen; genome-wide CRISPR screen in FOCAD isogenic cells; FOCAD re-expression rescue; orthogonal HBS1L manipulation; UPR/translational arrest readouts; xenograft mouse model\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via CRISPR screens with isogenic rescue and in vivo validation, single study\",\n      \"pmids\": [\"41101730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TNG961, a molecular glue degrader, promotes HBS1L-CRBN-compound complex formation and induces E3 ligase (cereblon)-dependent HBS1L ubiquitination and degradation. HBS1L degradation disrupts the HBS1L/PELO ribosome-rescue complex, causing translational arrest and UPR activation selectively in FOCAD-negative cancer cells. Cryo-EM structures guided compound optimization.\",\n      \"method\": \"Cryo-EM structural determination of HBS1L-CRBN-compound complex; in vitro ubiquitination assay; proteome selectivity profiling; cell viability assays; xenograft mouse model with oral TNG961 administration\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with in vitro ubiquitination, cellular mechanistic assays, and in vivo validation\",\n      \"pmids\": [\"42001523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The N-terminal UBAh domain of HBS1L (shared by both HBS1L and SKI7 isoforms) adopts a three-helix bundle architecture and directly binds ubiquitin via its hydrophobic patch interacting with the Ile44-centered hydrophobic patch of ubiquitin (Kd ~50 µM), with a distinctive double β-turn in the α1/α2 loop accommodating the ubiquitin β-turn. The hallmark VLGD/E motif was identified. This interaction suggests HBS1L and SKI7 are recruited to ubiquitinated stalled ribosomes via UBAh.\",\n      \"method\": \"NMR structure of mouse UBAh-ubiquitin complex; HSQC titration experiments; dissociation constant measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional binding validation by HSQC titration in single rigorous study\",\n      \"pmids\": [\"42234679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila, loss of Hbs1 (HBS1L ortholog) reduces expression of the stress-responsive transcription factor ATF4, which is encoded by an mRNA with multiple upstream open reading frames (uORFs). In human cells, HBS1L and PELOTA promote translation reinitiation at the ATF4 ORF by facilitating proper translation termination at preceding uORFs. Loss of Hbs1 in Drosophila lamina neurons causes visual defects (ERG abnormalities) and vacuolization/synapse defects; restoring ATF4 in lamina neurons partially rescues ERG defects.\",\n      \"method\": \"Drosophila Hbs1 loss-of-function mutants; ERG assays; confocal microscopy; human cell knockdown; ATF4 translation reporter assays; neuronal-specific rescue experiments\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with rescue in Drosophila and human cell mechanistic validation, preprint, single lab\",\n      \"pmids\": [\"41279977\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Knockdown of HBS1L (all known isoforms) using shRNA in erythroid progenitors from β0-thalassemia/HbE patients upregulates γ-globin mRNA (~1.69-fold) and increases fetal hemoglobin percentage (~16.7-fold), with only modest perturbation of red cell differentiation, establishing a direct functional role for HBS1L protein in erythroid globin regulation.\",\n      \"method\": \"Lentiviral shRNA knockdown of HBS1L in primary β0-thalassemia/HbE erythroid progenitors; RT-qPCR for globin mRNAs; HbF quantification; flow cytometry for erythroid differentiation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct loss-of-function in primary patient cells with multiple readouts, single lab\",\n      \"pmids\": [\"36888630\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HBS1L encodes a translational GTPase that, as the canonical long isoform (HBS1LV1), forms a complex with PELOTA/Dom34 to recognize and rescue stalled ribosomes — promoting ribosomal subunit dissociation, peptidyl-tRNA drop-off, and initiating mRNA quality control pathways (no-go decay, non-stop decay); a short splice isoform (HBS1LV3/SKI7) instead bridges the cytoplasmic RNA exosome and SKI complex for 3'→5' mRNA degradation; the shared N-terminal UBAh domain binds ubiquitin on stalled ribosomes to direct these complexes; loss of HBS1L depletes PELOTA (via proteasomal degradation), causes 80S monosome accumulation, activates mTOR/UPR, and produces developmental anomalies including retinal dystrophy, with additional roles in ATF4 translational reinitiation and, in erythroid cells, regulation of fetal hemoglobin production.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HBS1L is a translational GTPase that, together with its partner PELOTA (Dom34), recognizes and rescues stalled ribosomes to initiate mRNA surveillance pathways [#0, #2]. The complex binds the ribosomal A-site in a manner that structurally mimics elongation factor-tRNA and eRF1-eRF3 termination complexes, and its nucleotide (GTP/GDP) binding drives ribosomal subunit dissociation and peptidyl-tRNA drop-off during no-go decay and 18S non-functional rRNA decay [#0, #1]; the Dom34-Hbs1 interaction is required for no-go decay but dispensable for 18S NRD, genetically uncoupling these activities [#1]. HBS1L-mediated rescue acts downstream of ribosomal protein ubiquitination by ZNF-598 and feeds stalled transcripts into decay by the nuclease NONU-1 [#10], and the shared N-terminal UBAh domain directly binds ubiquitin via its hydrophobic patch, providing the molecular basis for recruitment to ubiquitinated stalled ribosomes [#14]. Beyond no-go decay, HBS1L drives non-stop decay through a complex with the exosome and SKI machinery, with a short splice isoform (HBS1LV3/SKI7) bridging the cytoplasmic exosome (via its C-terminal RxxxFxxxL motif contacting RRP43) while the canonical PELOTA-binding isoform does not bind the exosome and antagonizes SKI/exosome supercomplex formation [#2, #5]. The complex also splits inactive non-translating 80S ribosomes together with ABCE1 to enable translation restart after stress [#3]. Loss of HBS1L destabilizes PELOTA post-translationally via proteasomal degradation, causes 80S monosome accumulation, and activates mTOR and the unfolded protein response [#7, #12]. These functions are essential in vivo: biallelic HBS1L loss causes developmental anomalies and retinal dystrophy with photoreceptor apoptosis in humans and mice [#7, #11], HBS1L is synthetic lethal with FOCAD loss in cancer and is the target of a cereblon-recruiting molecular glue degrader (TNG961) that triggers translational arrest and UPR in FOCAD-negative cells [#12, #13], and HBS1L knockdown in erythroid progenitors upregulates fetal hemoglobin [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing the core biochemical activity: whether the Dom34:Hbs1 complex actively dissociates stalled ribosomes rather than merely binding them, and how this relates to canonical termination.\",\n      \"evidence\": \"Reconstituted yeast translation system with in vitro ribosome dissociation and peptidyl-tRNA drop-off assays; crystal structure of Hbs1 \\u00b1 GDP with low-resolution Dom34-Hbs1 model and mutagenesis\",\n      \"pmids\": [\"20947765\", \"21102444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Done in yeast components; direct demonstration with human HBS1L not shown here\", \"How stalled ribosomes are initially distinguished from elongating ones at the A-site not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended ribosome rescue to organellar translocons, showing Dom34:Hbs1 clears ribosomes stalled at the ER (Sec61) and mitochondrial (TOM40) import channels.\",\n      \"evidence\": \"Yeast deletion strains with nonstop reporters targeted to ER or mitochondria; cell fractionation\",\n      \"pmids\": [\"22981232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conducted in yeast; mammalian organellar rescue not directly tested\", \"Does not establish physical contact between the complex and translocon components\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated the mammalian complex requirement and its physical coupling to degradation machinery in non-stop decay.\",\n      \"evidence\": \"Non-stop reporter degradation assays, Co-IP of Hbs1-Dom34 with Ski2/Mtr4/Dis3, and siRNA knockdown in mammalian cells\",\n      \"pmids\": [\"23667253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-IP does not define direct vs indirect contacts within the exosome-SKI assembly\", \"Isoform-specific contributions not resolved at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed the complex acts on inactive monosomes beyond aberrant transcripts, splitting Stm1-clamped 80S ribosomes with ABCE1 to permit translation restart.\",\n      \"evidence\": \"In vitro ribosome dissociation assays plus in vivo polysome profiling and glucose-starvation restart assays in yeast\",\n      \"pmids\": [\"24424461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stm1-dependent mechanism described in yeast; mammalian equivalent not addressed\", \"Trigger that recruits the complex to inactive ribosomes during stress unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the isoform logic: a short HBS1L splice product (SKI7/HBS1LV3) handles exosome bridging while the canonical isoform handles PELOTA-dependent rescue, defining division of labor in human cells.\",\n      \"evidence\": \"Proteomics, reciprocal Co-IP, mRNA half-life measurements, and domain mutant (RxxxFxxxL/RRP43) analysis\",\n      \"pmids\": [\"28204585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of isoform splicing not addressed\", \"Structural basis of HBS1LV1 antagonism of supercomplex formation not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the cellular consequences of HBS1L loss in mammals: monosome accumulation, PELOTA destabilization via the proteasome, and mTOR/translation dysregulation linked to disease.\",\n      \"evidence\": \"Patient cells with biallelic mutation, polysome profiling, ribosome sequencing, proteasome rescue, and Hbs1l knockdown mouse model\",\n      \"pmids\": [\"30707697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking HBS1L loss to mTOR/4-EBP upregulation not defined\", \"How PELOTA is targeted for proteasomal degradation in HBS1L absence unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Placed HBS1L in the ubiquitin-initiated no-go decay pathway, downstream of ZNF-598 ribosomal ubiquitination and upstream of NONU-1 nuclease cleavage.\",\n      \"evidence\": \"C. elegans forward/reverse genetics, NGD reporter, ribosomal ubiquitination site mutations, and epistasis of ZNF-598/HBS-1/PELO-1/NONU-1\",\n      \"pmids\": [\"36626369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between ubiquitinated ribosome and HBS-1 recruitment not shown in this study\", \"Pathway order inferred from genetics, not reconstitution\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified a translation-surveillance-independent application: HBS1L knockdown raises fetal hemoglobin in thalassemic erythroid progenitors, implicating it in globin regulation.\",\n      \"evidence\": \"Lentiviral shRNA knockdown in primary \\u03b20-thalassemia/HbE erythroid progenitors with RT-qPCR, HbF quantification, and flow cytometry\",\n      \"pmids\": [\"36888630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism connecting HBS1L to \\u03b3-globin induction unknown\", \"Whether effect is via ribosome rescue or another route untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established HBS1L ribosome rescue as essential for photoreceptor maintenance, defining the retinal dystrophy phenotype mechanistically.\",\n      \"evidence\": \"Human patient ERG data, Hbs1l hypomorph mouse, OCT, TUNEL, and mass-spectrometry proteomics\",\n      \"pmids\": [\"38966981\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from rescue failure to photoreceptor apoptosis not dissected\", \"Why photoreceptors are selectively vulnerable unexplained\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a synthetic-lethal dependency with FOCAD and exploited it pharmacologically, showing HBS1L/PELO and FOCAD/SKI cooperate to resolve ribosomal stalling.\",\n      \"evidence\": \"Combinatorial and genome-wide CRISPR screens with FOCAD isogenic rescue and xenografts; cryo-EM-guided molecular glue degrader (TNG961) with in vitro ubiquitination and in vivo dosing\",\n      \"pmids\": [\"41101730\", \"42001523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise molecular interplay between FOCAD/SKI and HBS1L/PELO complexes not fully defined\", \"Resistance mechanisms to degrader-induced rescue loss unaddressed\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Provided the structural basis for recruitment: the shared N-terminal UBAh domain binds ubiquitin via the Ile44 patch, explaining how both HBS1L and SKI7 are directed to ubiquitinated stalled ribosomes.\",\n      \"evidence\": \"NMR structure of mouse UBAh-ubiquitin complex with HSQC titration and Kd measurement\",\n      \"pmids\": [\"42234679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Low-affinity interaction (Kd ~50 \\u00b5M); in vivo requirement of UBAh-ubiquitin binding for rescue not demonstrated here\", \"Specificity for particular ubiquitin chain types or ribosomal substrates unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HBS1L's molecular surveillance function connects to its tissue-specific physiological roles (fetal hemoglobin regulation, ATF4 reinitiation, neuronal/retinal maintenance) remains mechanistically unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified mechanism linking ribosome rescue defects to globin switching\", \"ATF4 reinitiation role rests on a preprint and awaits peer-reviewed confirmation\", \"Direct demonstration that UBAh-ubiquitin recruitment operates in each physiological context lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 3, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 3, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 12]}\n    ],\n    \"complexes\": [\n      \"PELOTA-HBS1L ribosome rescue complex\",\n      \"SKI complex\",\n      \"cytoplasmic RNA exosome (via SKI7/HBS1LV3)\"\n    ],\n    \"partners\": [\n      \"PELO\",\n      \"ABCE1\",\n      \"DIS3\",\n      \"MTREX\",\n      \"SKIV2L\",\n      \"EXOSC8\",\n      \"FOCAD\",\n      \"CRBN\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}