{"gene":"SEL1L","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2006,"finding":"SEL1L (mammalian homolog of yeast Hrd3p) is required for dislocation of misfolded proteins from the ER; shRNA knockdown of SEL1L inhibits degradation of misfolded ribophorin fragment (RI332) and discriminates between HCMV US11 and US2 dislocation pathways, placing SEL1L in the mammalian ERAD dislocation machinery.","method":"shRNA knockdown, pulse-chase degradation assay, functional discrimination of viral dislocation pathways","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function with specific substrate phenotype, replicated across multiple substrates and pathways in one study; foundational paper replicated by subsequent work","pmids":["17043138"],"is_preprint":false},{"year":2008,"finding":"SEL1L nucleates a protein complex for dislocation of misfolded glycoproteins, interacting with AUP1, UBXD8, UBC6e, and OS9 as functionally important components; mutagenesis and dominant-negative versions confirmed the functional importance of these interactions.","method":"Biochemical pulldown/co-IP of SEL1L-interacting proteins, mass spectrometry, mutagenesis, dominant-negative constructs","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, MS-based interactome, mutagenesis validation, multiple orthogonal methods in one study","pmids":["18711132"],"is_preprint":false},{"year":2008,"finding":"OS-9 and XTP3-B bind ERAD substrates and, through the SEL1L adaptor, connect to the ER-membrane-embedded ubiquitin ligase Hrd1; the MRH domains of OS-9/XTP3-B are required for interaction with SEL1L but not substrate; GRP94, together with Hrd1 and SEL1L, is required for degradation of mutant alpha1-antitrypsin.","method":"Co-immunoprecipitation, siRNA knockdown, ERAD substrate degradation assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, functional knockdown with substrate phenotype, domain mapping, replicated across multiple labs","pmids":["18264092"],"is_preprint":false},{"year":2008,"finding":"XTP3-B long isoform associates with the HRD1-SEL1L membrane-anchored ubiquitin ligase complex and BiP, forming a ~27S ER quality control scaffold complex; this large complex also incorporates OS-9 but not gp78.","method":"Immunoprecipitation, sucrose density gradient centrifugation, ERAD substrate degradation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus orthogonal sucrose gradient fractionation, multiple substrates tested","pmids":["18502753"],"is_preprint":false},{"year":2009,"finding":"EDEM1 binds nonnative proteins in a glycan-independent manner and uses its mannosidase-like domain (not catalytic activity) to associate with the ER membrane adaptor SEL1L; mutation of the EDEM1 mannosidase-like domain diminishes its association with SEL1L, linking substrate recognition to delivery to the SEL1L-containing dislocation complex.","method":"Co-immunoprecipitation, site-directed mutagenesis, kifunensine treatment, ERAD degradation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mutagenesis and pharmacological inhibition, multiple orthogonal approaches in one study","pmids":["19524542"],"is_preprint":false},{"year":2010,"finding":"Disposal of soluble ERAD-L substrates (ERAD-LS) is strictly dependent on HRD1, SEL1L, and the ER lectins OS-9 and XTP3-B; tethering the same substrates to the membrane (ERAD-LM) renders these factors dispensable, revealing pathway-selective roles for SEL1L.","method":"siRNA knockdown, pulse-chase degradation assay with defined ERAD-LS and ERAD-LM substrates","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockdown with multiple substrate classes, replicated findings, mechanistic distinction established","pmids":["20100910"],"is_preprint":false},{"year":2011,"finding":"In mammalian cells (unlike yeast), SEL1L is the unstable partner: its half-life is reduced when HRD1 is silenced, and transiently expressed SEL1L is rapidly degraded unless HRD1 is coexpressed; HRD1 association stabilizes SEL1L via interaction at the SEL1L transmembrane domain; free SEL1L is degraded by the ubiquitin-proteasome pathway via an E3 ligase other than HRD1.","method":"siRNA knockdown, cycloheximide chase, co-immunoprecipitation, proteasome inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KD, CHX chase, co-IP, pharmacological inhibition) with mechanistic clarity; replicated in subsequent studies","pmids":["21454652"],"is_preprint":false},{"year":2012,"finding":"SEL1L forms a complex with cytosolic LC3-I that acts as an ERAD tuning receptor, mediating COPII-independent, vesicle-mediated removal of lumenal ERAD regulators EDEM1 and OS-9 from the ER; expression of misfolded polypeptides inhibits SEL1L:LC3-I-mediated segregation, raising ERAD activity without UPR induction.","method":"Co-immunoprecipitation, vesicle fractionation, siRNA knockdown, live-cell imaging","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, fractionation, and functional KD with defined regulatory phenotype; novel mechanism with multiple orthogonal validations","pmids":["22633958"],"is_preprint":false},{"year":2013,"finding":"ATF6 (a transmembrane UPR sensor/transducer) is an ERAD substrate that requires SEL1L for proteasomal degradation despite its transmembrane nature; degradation is dependent on the luminal region of ATF6 and on mannose trimming (inhibited by kifunensine), defining a novel ERAD-LM subclass requiring SEL1L.","method":"Gene knockout (DT40 cells), pulse-chase assay, chimeric protein analysis, kifunensine pharmacological inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — genetic KO with domain-swap chimeras, pharmacological inhibition, and defined substrate phenotype in a clean cell model","pmids":["24043630"],"is_preprint":false},{"year":2013,"finding":"ERdj5 interacts directly with SEL1L's N-terminal luminal domain, linking ERdj5 to the Hrd1 complex; SEL1L itself binds cholera toxin CTA subunit and facilitates its retrotranslocation; EDEM1 and OS-9 do not play significant roles in CTA1 retrotranslocation.","method":"Loss-of-function and gain-of-function approaches, co-immunoprecipitation, domain mapping","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping and functional assay, but single lab study","pmids":["23363602"],"is_preprint":false},{"year":2014,"finding":"Sel1L is required for Hrd1 protein stability in mammalian cells (unlike the reciprocal relationship in yeast); acute Sel1L loss in mice causes rapid Hrd1 degradation, impaired ERAD function, ER stress, translational attenuation, and ribosomal subunit aggregation, leading to pancreatic atrophy and death within 3 weeks.","method":"Inducible knockout mouse model, biochemical fractionation, mass spectrometry, pulse-chase ERAD assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo inducible KO with biochemical, proteomic, and functional validation; replicated in multiple tissue contexts","pmids":["24453213"],"is_preprint":false},{"year":2014,"finding":"SEL1L physically interacts with and stabilizes the LPL–LMF1 maturation complex in the ER, promoting LPL secretion independent of its Hrd1-mediated ERAD function; in Sel1L-deficient adipocytes, LPL is retained in the ER, forms aggregates, and is degraded by autophagy rather than ERAD.","method":"Adipocyte-specific knockout mouse, co-immunoprecipitation, pulse-chase secretion assay, autophagy inhibitor treatment","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, reciprocal co-IP, and mechanistic pathway distinction (ERAD-independent function), multiple orthogonal methods","pmids":["25066055"],"is_preprint":false},{"year":2015,"finding":"The inherent instability of human SEL1L resides in its transmembrane domain; association of HRD1 with the SEL1L transmembrane domain restores SEL1L stability; the SEL1L luminal domain retains misfolded cargo in the ER and can inhibit HRD1-mediated degradation when overexpressed without the transmembrane domain.","method":"Deletion mutagenesis, co-immunoprecipitation, cycloheximide chase, ERAD substrate degradation assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis combined with stability assay and functional ERAD readout, single lab","pmids":["26471130"],"is_preprint":false},{"year":2015,"finding":"The Hrd1-Sel1L membrane complex conducts Akita proinsulin (MIDY mutant) from the ER lumen to the cytosol for proteasomal degradation via p97; PDI reduces proinsulin disulfide bonds and primes Akita for ERAD; efficient PDI engagement is linked to Hrd1 availability, suggesting retrotranslocation coordination on the lumenal side.","method":"siRNA knockdown, co-immunoprecipitation, pulse-chase retrotranslocation assay, PDI redox assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple KD targets with substrate-specific readout, novel PDI-priming mechanism, single lab","pmids":["26269577"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the mouse SEL1L central domain (SLR motifs 5–9) reveals a homodimer with two-fold head-to-tail symmetry mediated by domain-swapped SLR motif 9; the SLR-C region (SLR motifs 10–11) directly interacts with the N-terminus luminal loops of HRD1; full-length SEL1L forms self-oligomers via the central domain in mammalian cells.","method":"X-ray crystallography, co-immunoprecipitation, mutagenesis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with domain mapping and biochemical validation of HRD1 interaction, multiple orthogonal methods","pmids":["27064360"],"is_preprint":false},{"year":2016,"finding":"Yeast Hrd3 (SEL1L ortholog) has a direct and critical role in ERAD beyond stabilizing Hrd1; using a Usa1-based approach to maintain Hrd1 in the absence of Hrd3, Hrd3 was shown to be required for E3 activity of Hrd1, rather than substrate or E2 recruitment to Hrd1.","method":"Genetic epistasis in yeast (Saccharomyces cerevisiae), Usa1-based Hrd1 stabilization system, ERAD substrate degradation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — elegant genetic dissection with controlled epistasis, rigorous in vivo ERAD assays in yeast ortholog","pmids":["27170191"],"is_preprint":false},{"year":2016,"finding":"The Sel1L-Hrd1 ERAD complex selectively recognizes and targets the pre-B cell receptor (pre-BCR) for proteasomal degradation in a BiP-dependent manner; loss of Sel1L in B cell precursors causes pre-BCR accumulation intracellularly and at the cell surface, leading to persistent pre-BCR signaling and a developmental block at the large-to-small pre-B cell transition.","method":"B cell-specific knockout mouse, co-immunoprecipitation, flow cytometry, cell surface staining","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined substrate (pre-BCR), co-IP, and mechanistic pathway placement","pmids":["27568564"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of yeast Hrd1 (SEL1L ortholog Hrd3 complex) reveals Hrd1 forms a dimer within the membrane with one or two Hrd3 molecules on the luminal side; each Hrd1 molecule has 8 transmembrane segments forming an aqueous cavity extending from the cytosol almost to the ER lumen with a lateral gate, suggesting Hrd1 forms a retro-translocation channel.","method":"Cryo-electron microscopy structural determination","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure of the Hrd1-Hrd3 complex at near-atomic resolution; directly relevant to SEL1L (Hrd3) binding to Hrd1 at luminal side","pmids":["28682307"],"is_preprint":false},{"year":2017,"finding":"SEL1L-dependent ERAD substrates require Derlin2/3 and Herp1/2 for degradation, defining an HRD1-engaged retrotranslocon route 1 (requiring SEL1L, Derlin2 or Derlin3, and Herp1 or Herp2), distinct from a second HRD1-engaged route that does not require these factors.","method":"Gene knockout in chicken DT40 cells, pulse-chase ERAD degradation assay, multiple substrate analysis","journal":"Cell structure and function","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO of multiple pathway components, systematic substrate-dependent pathway mapping","pmids":["28552883"],"is_preprint":false},{"year":2018,"finding":"The Sel1L-Hrd1 ERAD complex controls FGF21 transcription by regulating ubiquitination and turnover of ER-resident transcription factor CREBH, thereby controlling nuclear abundance of CREBH; hepatic Sel1L deletion elevates circulating FGF21 via CREBH accumulation, while PPARα-mediated Fgf21 transcription is unaffected.","method":"Liver-specific knockout mouse, ubiquitination assay, nuclear fractionation, reporter assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with biochemical ubiquitination assay, substrate-specific effect (CREBH vs PPARα), mechanistic pathway placement","pmids":["30389665"],"is_preprint":false},{"year":2018,"finding":"HCMV UL148 interacts with SEL1L by mass spectrometry co-immunoprecipitation; knockdown of SEL1L or Hrd1 stabilizes viral glycoprotein gO, demonstrating gO is a constitutive ERAD substrate of the SEL1L-Hrd1 complex; gO interaction with OS-9 is also stabilized by SEL1L silencing.","method":"Mass spectrometry co-immunoprecipitation, siRNA knockdown, pulse-chase assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based co-IP and siRNA knockdown with substrate phenotype, single lab","pmids":["29997207"],"is_preprint":false},{"year":2020,"finding":"Sel1L-Hrd1 ERAD controls β cell identity via TGF-β signaling by mediating the degradation of TGF-β receptor 1 (TGFBR1); Sel1L deficiency is not associated with β cell apoptosis but loss of β cell identity; inhibition of TGF-β signaling in Sel1L-deficient β cells restores expression of β cell maturation markers and insulin content.","method":"β cell-specific knockout mouse, single-cell RNA-seq, TGF-β receptor stability assay, pharmacological TGF-β inhibition","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, scRNA-seq, substrate identification, pharmacological rescue, multiple orthogonal methods","pmids":["32182217"],"is_preprint":false},{"year":2021,"finding":"Cytomegalovirus M50 protein mediates IRE1 degradation by tethering IRE1 to SEL1L, facilitating SEL1L-HRD1/p97-dependent proteasomal degradation of IRE1; M50 binds both IRE1 and SEL1L simultaneously; genetic ablation of SEL1L blocks M50-dependent IRE1 degradation.","method":"SEL1L genetic ablation, co-immunoprecipitation, proteasome and p97 inhibitor treatment, pulse-chase assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with pharmacological confirmation and co-IP demonstrating ternary complex, single lab","pmids":["33472927"],"is_preprint":false},{"year":2022,"finding":"SEL1L-HRD1 ERAD suppresses hepatocyte proliferation and tumorigenesis by degrading WNT5A; nascent WNT5A is misfolding-prone and a quality-control ERAD substrate; in ERAD-deficient cells WNT5A accumulates as high-molecular-weight aggregates in the ER, causing loss-of-function and loss of WNT5A-mediated suppression of hepatocyte proliferation.","method":"Hepatocyte-specific knockout mouse, proteomics screen, co-immunoprecipitation, substrate stability assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO, proteomics substrate identification, biochemical validation, single lab","pmids":["36238898"],"is_preprint":false},{"year":2023,"finding":"SEL1L-HRD1 ERAD ubiquitinates and targets nascent STING protein for proteasomal degradation in the basal state, limiting the size of the activable STING pool; this ERAD-mediated regulation of STING is uncoupled from ER stress and IRE1α; SEL1L or HRD1 deficiency in macrophages amplifies STING signaling and antiviral/antitumor immunity.","method":"Macrophage-specific knockout mouse, ubiquitination assay, co-immunoprecipitation, viral infection and tumor growth assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, ubiquitination assay, in vivo functional phenotypes, substrate identification with multiple orthogonal approaches","pmids":["37142791"],"is_preprint":false},{"year":2023,"finding":"SEL1L-HRD1 ERAD in hepatocytes controls systemic iron homeostasis by degrading ceruloplasmin (CP); CP is a bona fide ERAD substrate that, in the absence of ERAD, accumulates in the ER and is shunted to refolding, leading to elevated secretion and altered iron distribution; SEL1L-HRD1 also degrades disease-causing CP mutants.","method":"Hepatocyte-specific knockout mouse, proteomics, co-immunoprecipitation, substrate stability assay, iron homeostasis measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, proteomics, biochemical validation of substrate, physiological phenotype, multiple orthogonal methods","pmids":["36595688"],"is_preprint":false},{"year":2023,"finding":"SEL1L deficiency in CD8+ T cells leads to excessive PERK-ATF4-CHOP-Bim-mediated ER stress and aberrant mTORC1/c-MYC activation via enhanced IL-15 receptor α and β chain expression; PERK inhibition rescues SEL1L-deficient CD8+ T cell survival defects; IRE1α deficiency decreases mTORC1 signaling in Sel1l-/- naïve CD8+ T cells by downregulating IL-15 receptor α chain.","method":"T cell-specific conditional knockout, single-cell transcriptomics, PERK inhibitor treatment, adoptive transfer","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with scRNA-seq and pharmacological rescue, single lab, mechanistic pathway placement","pmids":["37644166"],"is_preprint":false},{"year":2024,"finding":"SEL1L variant p.Ser658Pro is a pathogenic hypomorphic mutation that reduces SEL1L protein stability and attenuates SEL1L-HRD1 interaction (likely via electrostatic repulsion between SEL1L F668 and HRD1 Y30); SEL1L is required for recruitment of E2 enzyme UBE2J1 and DERLIN to HRD1, establishing SEL1L-HRD1 interaction as a prerequisite for functional ERAD complex formation.","method":"Knock-in mouse model, biochemical co-immunoprecipitation, proteomics interactome screen, mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in model, proteomics, biochemical validation of interface residues, mechanistic dissection of complex assembly","pmids":["38365914"],"is_preprint":false},{"year":2024,"finding":"Three biallelic missense variants in SEL1L (p.Gly585Asp, p.Met528Arg) and HRD1 (p.Pro398Leu) impair ERAD function at distinct steps: p.Gly585Asp disrupts substrate recruitment, p.Met528Arg disrupts SEL1L-HRD1 complex formation, and p.Pro398Leu impairs HRD1 activity; these hypomorphic variants establish the importance of SEL1L-HRD1 ERAD in human neurodevelopment.","method":"Biochemical co-immunoprecipitation, ERAD substrate degradation assay, patient-derived variant functional analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple patient variants tested biochemically with defined steps impaired, mechanistic dissection at each ERAD stage","pmids":["37943610"],"is_preprint":false},{"year":2024,"finding":"The SEL1L variant p.Cys141Tyr disrupts a disulfide bond in the luminal fibronectin II domain of SEL1L, largely abolishing SEL1L-HRD1 ERAD function in part via proteasomal-mediated HRD1 self-destruction; loss of this disulfide bond leads to agammaglobulinemia (no mature B cells) and early death, establishing SEL1L fibronectin II domain as functionally critical.","method":"Patient variant characterization, biochemical stability assay, co-immunoprecipitation, B cell development analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient variant with domain-specific mechanism (disulfide bond), biochemical and functional validation, HRD1 self-destruction mechanism identified","pmids":["37943617"],"is_preprint":false},{"year":2024,"finding":"A proteomics strategy identified over 100 high-confidence SEL1L-HRD1 ERAD substrates in human HEK293T cells and mouse brown adipose tissue; PIGK (catalytic subunit of GPI-transamidase complex) is a shared substrate, and SEL1L-HRD1 ERAD attenuates GPI-anchored protein biogenesis by targeting PIGK for proteasomal degradation.","method":"Proteomics substrate screen with machine learning filtering, co-immunoprecipitation, substrate degradation assay, GPI-anchored protein surface staining","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomics combined with biochemical validation, functional consequence in GPI biogenesis, multiple orthogonal methods","pmids":["38253565"],"is_preprint":false},{"year":2024,"finding":"SEL1L-HRD1 ERAD in POMC-expressing neurons degrades misfolded nascent leptin receptor long isoform (LepRb), both wildtype and disease-associated Cys604Ser variant; loss of SEL1L causes ER retention of LepRb in an ER stress-independent manner, attenuating leptin signaling and predisposing mice to diet-induced obesity.","method":"POMC neuron-specific knockout mouse, co-immunoprecipitation, substrate stability and localization assay, leptin signaling assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell type-specific KO, defined substrate (LepRb), ER stress-independent mechanism established, functional metabolic phenotype","pmids":["39343970"],"is_preprint":false},{"year":2024,"finding":"Purkinje cell-specific deletion of SEL1L causes early-onset progressive cerebellar ataxia with Purkinje cell loss, dilated ER, and fragmented nuclei, establishing SEL1L-HRD1 ERAD as specifically required in Purkinje cells for cerebellar homeostasis.","method":"Purkinje cell-specific (Pcp2-Cre) knockout mouse, transmission electron microscopy, behavioral motor testing, immunohistochemistry","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell type-specific KO with ultrastructural evidence and defined behavioral phenotype","pmids":["39352758"],"is_preprint":false},{"year":2024,"finding":"SEL1L-HRD1 ERAD is required for fibrinogen biogenesis: degradation of misfolded endogenous fibrinogen Aα, Bβ, and γ chains by SEL1L-HRD1 is indispensable for formation of a functional fibrinogen complex; in ERAD-deficient hepatocytes, fibrinogen subunits accumulate as inclusion body components; disease-causing fibrinogen γ mutants are also SEL1L-HRD1 substrates.","method":"Hepatocyte-specific knockout mouse, proteomics, co-immunoprecipitation, substrate stability and secretion assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, proteomics, biochemical substrate validation, disease mutant analysis, multiple methods","pmids":["39455574"],"is_preprint":false},{"year":2024,"finding":"Genome-wide CRISPR screens identified SEL1L as an intracellular regulator of collagen clearance via a noncanonical function distinct from its canonical ERAD role; SEL1L senses collagen biosynthesis and negatively regulates extracellular collagen clearance as a homeostatic feedback mechanism.","method":"Genome-wide CRISPR screen, loss-of-function validation, collagen clearance assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — unbiased genome-wide screen with validation, novel noncanonical function, mechanistic details limited in abstract","pmids":["38378719"],"is_preprint":false},{"year":2024,"finding":"SEL1L is required for optimal CD8+ T cell bioenergetics and c-Myc expression following viral activation; loss of Sel1L limits CD8+ T cell function and memory formation after acute viral infection.","method":"T cell-specific conditional knockout mouse, viral infection model, metabolic profiling, adoptive transfer","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined functional phenotype and metabolic readout, mechanistic link to c-Myc and bioenergetics","pmids":["38687642"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure of the core mammalian ERAD complex comprising OS9, SEL1L, and HRD1 reveals a dimeric assembly: SEL1L and OS9 form a claw-like configuration in the ER lumen mediating substrate engagement, while HRD1 dimerizes within the membrane for substrate translocation; pathogenic SEL1L mutations at SEL1L-OS9 (Gly585Asp) and SEL1L-HRD1 (Ser658Pro) interfaces disrupt complex formation; HRD1 variant Ala91Asp impairs HRD1 dimerization; two methionine-rich crevices flank the HRD1 dimer as putative substrate-conducting channels.","method":"Cryo-EM structural determination, mutagenesis, crosslinking assays, functional ERAD validation","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Strong — first mammalian ERAD complex cryo-EM structure with mutagenesis and crosslinking validation; multiple disease variants functionally characterized","pmids":["40661598"],"is_preprint":true},{"year":2011,"finding":"SEL1L co-immunoprecipitates with β1-integrin in pancreatic β-cells; downmodulation of SEL1L negatively influences cell adhesion on matrix components and cell proliferation via altered ERK signaling; SEL1L absence strongly inhibits glucose-stimulated insulin secretion in isolated pancreatic islets, a phenotype rescued by ectopic β1-integrin expression.","method":"Co-immunoprecipitation, siRNA knockdown, adhesion assay, ERK signaling assay, insulin secretion assay, rescue experiment","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP and functional rescue, multiple cellular readouts, but single lab with primarily descriptive functional phenotype","pmids":["24324549"],"is_preprint":false},{"year":2021,"finding":"Excess free SEL1L (not associated with HRD1) generates cytosolic degradation intermediates when proteasome activity is inhibited; these C-terminal Pro-rich region fragments stimulate aggregation of polyglutamine-expanded Huntingtin protein by interacting with aggregation-prone proteins; OS-9 and XTP3-B inhibit SEL1L degradation.","method":"Proteasome inhibitor treatment, co-immunoprecipitation, co-aggregation assay, deletion mutagenesis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined biochemical mechanism with domain mapping and functional aggregation assay, single lab","pmids":["33576152"],"is_preprint":false},{"year":2023,"finding":"SIRT4 deacetylates SEL1L at lysine 547, which increases HRD1 protein levels and the SEL1L-HRD1 complex; increased SEL1L-HRD1 complex reduces stability of mitochondrial protein ALKBH1, leading to blocked transcription of mitochondrial DNA-coded genes and mitochondrial damage in pancreatic cancer cells.","method":"Co-immunoprecipitation, deacetylation assay, siRNA knockdown, ALKBH1 stability assay","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical deacetylation assay and co-IP with functional downstream readout, single lab","pmids":["37146713"],"is_preprint":false}],"current_model":"SEL1L is an ER-resident single-pass transmembrane adaptor protein that forms the core of the mammalian SEL1L-HRD1 ERAD complex, where it stabilizes the E3 ubiquitin ligase HRD1, recruits substrate-recognition factors (OS-9, XTP3-B, EDEM1, ERdj5) and retrotranslocon components (Derlins, Herp) via its luminal SEL1L-repeat (SLR) domains, facilitates recruitment of the E2 enzyme UBE2J1 to HRD1, and coordinates ubiquitination and proteasomal degradation of a wide range of misfolded luminal and select transmembrane ERAD substrates including STING, TGF-β receptor 1, CREBH, ceruloplasmin, LepRb, pre-BCR, PIGK, WNT5A, fibrinogen chains, and others; the recently solved cryo-EM structure shows SEL1L and OS9 form a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel, and pathogenic hypomorphic mutations at the SEL1L-OS9 and SEL1L-HRD1 interfaces cause neurodevelopmental disorders and agammaglobulinemia in humans."},"narrative":{"mechanistic_narrative":"SEL1L is an ER-resident single-pass transmembrane adaptor that forms the core of the mammalian SEL1L-HRD1 ER-associated degradation (ERAD) machinery, where it nucleates the dislocation complex required to extract and degrade misfolded ER proteins [PMID:17043138, PMID:18711132]. Through its luminal SEL1L-repeat (SLR) domains, SEL1L bridges substrate-recognition lectins and chaperones — OS-9, XTP3-B, EDEM1, and ERdj5 — to the membrane-embedded E3 ligase HRD1, assembling a large ER quality-control scaffold that channels glycoprotein and other substrates toward ubiquitination [PMID:18711132, PMID:18264092, PMID:18502753, PMID:19524542, PMID:23363602]. This handoff is pathway-selective: degradation of soluble luminal substrates strictly depends on SEL1L, OS-9, and XTP3-B, whereas membrane-tethered substrates can bypass these factors, and a distinct HRD1 route requires Derlins and Herp downstream of SEL1L [PMID:20100910, PMID:28552883]. SEL1L is essential for assembly and activity of the complex — it stabilizes HRD1 and is itself a prerequisite for recruiting the E2 enzyme UBE2J1 and Derlin to HRD1, with the two proteins reciprocally stabilizing each other through their transmembrane and luminal interfaces [PMID:24453213, PMID:38365914, PMID:21454652]. Structurally, SEL1L homodimerizes via its central SLR domain and contacts the HRD1 luminal loops, and the core OS9-SEL1L-HRD1 assembly forms a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel [PMID:27064360, PMID:40661598]. Beyond bulk quality control, SEL1L-HRD1 ERAD degrades a broad and physiologically defined substrate set — STING, TGF-β receptor 1, CREBH, ceruloplasmin, LepRb, pre-BCR, PIGK, WNT5A, and fibrinogen chains — thereby tuning innate immune signaling, β-cell identity, iron and lipid homeostasis, leptin signaling, B-cell development, and GPI-anchored protein biogenesis [PMID:27568564, PMID:30389665, PMID:32182217, PMID:37142791, PMID:36595688, PMID:38253565, PMID:39343970, PMID:39455574]. SEL1L also performs ERAD-independent functions, stabilizing the LPL-LMF1 maturation complex to promote lipase secretion [PMID:25066055]. In humans, biallelic hypomorphic SEL1L variants that disrupt the SEL1L-OS9 or SEL1L-HRD1 interfaces or destabilize the protein cause neurodevelopmental disorders and agammaglobulinemia [PMID:38365914, PMID:37943610, PMID:37943617].","teleology":[{"year":2006,"claim":"Established that the mammalian Hrd3p homolog SEL1L is a required component of the ER dislocation machinery, placing it in the pathway that extracts misfolded proteins from the ER.","evidence":"shRNA knockdown with pulse-chase degradation of misfolded RI332 and discrimination of viral US11/US2 dislocation routes","pmids":["17043138"],"confidence":"High","gaps":["Molecular interactions and complex composition not yet defined","Did not identify the E3 ligase partner"]},{"year":2008,"claim":"Defined SEL1L as the adaptor that nucleates a dislocation complex, physically linking substrate-recognition lectins OS-9 and XTP3-B to the HRD1 E3 ligase and forming a large ~27S quality-control scaffold.","evidence":"Reciprocal co-IP, mass-spec interactome, sucrose-gradient fractionation, domain mapping, and substrate degradation assays across three studies","pmids":["18711132","18264092","18502753"],"confidence":"High","gaps":["Stoichiometry and architecture of the scaffold unresolved at atomic level","How substrates are passed from lectins to HRD1 unknown"]},{"year":2009,"claim":"Showed substrate-recognition chaperones EDEM1 and ERdj5 deliver nonnative proteins to the SEL1L complex via direct binding to SEL1L domains, connecting recognition to dislocation.","evidence":"Co-IP with domain mutagenesis, kifunensine treatment, and degradation assays (EDEM1, 2009; ERdj5/CTA, 2013)","pmids":["19524542","23363602"],"confidence":"Medium","gaps":["ERdj5 finding from a single lab","Order of chaperone engagement relative to lectins not established"]},{"year":2010,"claim":"Resolved that SEL1L's requirement is substrate-topology-selective — strictly needed for soluble luminal ERAD substrates but dispensable when substrates are membrane-tethered.","evidence":"siRNA knockdown with defined ERAD-LS vs ERAD-LM substrate pulse-chase","pmids":["20100910"],"confidence":"High","gaps":["Mechanistic basis for topology selectivity not defined","Did not enumerate the full substrate repertoire"]},{"year":2014,"claim":"Established the mammalian-specific reciprocal stability relationship: SEL1L stabilizes HRD1 (opposite to yeast), with in vivo loss causing ERAD collapse, ER stress, and lethal pancreatic atrophy.","evidence":"Inducible knockout mice, biochemical fractionation, proteomics, and pulse-chase ERAD assay; complemented by reciprocal stabilization studies via the TM domain","pmids":["24453213","21454652","26471130"],"confidence":"High","gaps":["E3 ligase degrading free SEL1L not identified","Tissue-specific essentiality determinants unclear"]},{"year":2014,"claim":"Demonstrated SEL1L has ERAD-independent functions, stabilizing the LPL-LMF1 maturation complex to promote lipase secretion, separating chaperone-like roles from HRD1-mediated degradation.","evidence":"Adipocyte-specific knockout mice, co-IP, secretion pulse-chase, and autophagy inhibition","pmids":["25066055"],"confidence":"High","gaps":["Structural basis for SEL1L-LPL/LMF1 binding undefined","Extent of other ERAD-independent clients unknown"]},{"year":2016,"claim":"Provided first structural insight: SEL1L homodimerizes via domain-swapped SLR motifs and directly contacts HRD1 luminal loops through its SLR-C region; yeast work showed the ortholog is directly required for HRD1 E3 activity beyond stabilization.","evidence":"X-ray crystallography of the SEL1L central domain with co-IP/mutagenesis, and yeast genetic epistasis using a Usa1-based Hrd1-stabilization system","pmids":["27064360","27170191"],"confidence":"High","gaps":["Full-length mammalian complex architecture not resolved","Mechanism by which SEL1L activates HRD1 catalysis unclear"]},{"year":2017,"claim":"Cryo-EM of the yeast Hrd1-Hrd3 complex revealed Hrd1 forms a membrane dimer with a lateral-gated aqueous cavity, supporting a retrotranslocation channel model with the SEL1L ortholog on the luminal side.","evidence":"Cryo-electron microscopy of the Hrd1-Hrd3 complex","pmids":["28682307"],"confidence":"High","gaps":["Yeast structure; mammalian complex differs","How the channel accommodates folded/disulfide-bonded substrates unclear"]},{"year":2018,"claim":"Defined the route 1 retrotranslocon: SEL1L-dependent substrates additionally require Derlin2/3 and Herp1/2, distinguishing them from a second HRD1 route, refining how SEL1L substrates exit the ER.","evidence":"Genetic knockout in DT40 cells with multi-substrate pulse-chase","pmids":["28552883"],"confidence":"High","gaps":["Rules determining route assignment per substrate not defined","Physical organization of Derlin/Herp within the complex unresolved"]},{"year":2023,"claim":"Expanded the physiological substrate repertoire and disease relevance, showing SEL1L-HRD1 ERAD degrades specific clients (STING, TGFBR1, CREBH, ceruloplasmin, pre-BCR) in an ER-stress-uncoupled manner to control immunity, β-cell identity, metabolism, and B-cell development.","evidence":"Multiple tissue-specific knockout mice with ubiquitination assays, co-IP, proteomics, and functional/physiological readouts","pmids":["37142791","32182217","30389665","36595688","27568564"],"confidence":"High","gaps":["How specific substrates are selected from the proteome unclear","Whether substrate sets overlap or differ across tissues not fully mapped"]},{"year":2024,"claim":"Systematic proteomics and tissue-specific knockouts established a >100-substrate landscape (including PIGK, WNT5A, LepRb, fibrinogen chains) and demonstrated SEL1L-HRD1 is a prerequisite for recruiting UBE2J1 and Derlin to HRD1, with human hypomorphic variants causing neurodevelopmental disorders and agammaglobulinemia.","evidence":"Proteomics substrate screens, knock-in and conditional knockout mice, patient-variant biochemical interface mapping, and degradation assays","pmids":["38253565","39343970","39455574","27170191","38365914","37943610","37943617","36238898"],"confidence":"High","gaps":["Genotype-phenotype basis of distinct human syndromes incompletely explained","Selectivity logic for the broad substrate set unresolved"]},{"year":2025,"claim":"Cryo-EM of the mammalian core OS9-SEL1L-HRD1 complex resolved a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel and mapped pathogenic variants to specific interfaces.","evidence":"Cryo-EM structural determination with mutagenesis, crosslinking, and functional ERAD validation (preprint)","pmids":["40661598"],"confidence":"High","gaps":["Preprint, not yet peer-reviewed","Substrate trajectory through the methionine-rich crevices not directly visualized"]},{"year":null,"claim":"How the SEL1L-HRD1 complex selects which of its many substrates and tissue contexts to act on, and the mechanistic basis of its noncanonical functions (collagen clearance, SIRT4-regulated ALKBH1 turnover, integrin/insulin secretion), remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Substrate selection determinants undefined","Noncanonical roles (collagen sensing, ALKBH1) mechanistically incomplete and single-lab","Regulation of complex assembly by post-translational modification (e.g. K547 deacetylation) not integrated into structural model"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,4,9,27]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[15,19,24,27]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,7,11]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,5,10,30]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[8,26]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,24,29]}],"complexes":["SEL1L-HRD1 ERAD complex","OS9-SEL1L-HRD1 core complex","LPL-LMF1 maturation complex"],"partners":["HRD1","OS-9","XTP3-B","EDEM1","ERDJ5","UBE2J1","DERL2","AUP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBV2","full_name":"Protein sel-1 homolog 1","aliases":["Suppressor of lin-12-like protein 1","Sel-1L"],"length_aa":794,"mass_kda":88.8,"function":"Plays a role in the endoplasmic reticulum quality control (ERQC) system also called ER-associated degradation (ERAD) involved in ubiquitin-dependent degradation of misfolded endoplasmic reticulum proteins (PubMed:16186509, PubMed:29997207, PubMed:37943610, PubMed:37943617). Enhances SYVN1 stability. Plays a role in LPL maturation and secretion. Required for normal differentiation of the pancreas epithelium, and for normal exocrine function and survival of pancreatic cells. May play a role in Notch signaling","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9UBV2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SEL1L","classification":"Not Classified","n_dependent_lines":37,"n_total_lines":1208,"dependency_fraction":0.030629139072847682},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SYVN1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SEL1L","total_profiled":1310},"omim":[{"mim_id":"621068","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA, POOR GROWTH, DYSMORPHIC FACIES, AND AGAMMAGLOBULINEMIA; NEDHGFA","url":"https://www.omim.org/entry/621068"},{"mim_id":"621067","title":"NEURODEVELOPMENTAL DISORDER WITH POOR GROWTH, ABSENT SPEECH, PROGRESSIVE ATAXIA, AND DYSMORPHIC FACIES; NEDGSAF","url":"https://www.omim.org/entry/621067"},{"mim_id":"619914","title":"SEL1L FAMILY, MEMBER 3; SEL1L3","url":"https://www.omim.org/entry/619914"},{"mim_id":"616175","title":"UBIQUITIN-CONJUGATING ENZYME E2 J1; UBE2J1","url":"https://www.omim.org/entry/616175"},{"mim_id":"614289","title":"SUPPRESSOR OF LIN12-LIKE 2; SEL1L2","url":"https://www.omim.org/entry/614289"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"pancreas","ntpm":380.4}],"url":"https://www.proteinatlas.org/search/SEL1L"},"hgnc":{"alias_symbol":["IBD2","SEL1L1","Hrd3"],"prev_symbol":[]},"alphafold":{"accession":"Q9UBV2","domains":[{"cath_id":"1.25.40.10","chopping":"192-290","consensus_level":"high","plddt":94.7728,"start":192,"end":290},{"cath_id":"1.25.40.10","chopping":"360-481","consensus_level":"medium","plddt":91.9334,"start":360,"end":481}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBV2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBV2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBV2-F1-predicted_aligned_error_v6.png","plddt_mean":81.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SEL1L","jax_strain_url":"https://www.jax.org/strain/search?query=SEL1L"},"sequence":{"accession":"Q9UBV2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBV2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBV2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBV2"}},"corpus_meta":[{"pmid":"18264092","id":"PMC_18264092","title":"OS-9 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machinery.\",\n      \"method\": \"shRNA knockdown, pulse-chase degradation assay, functional discrimination of viral dislocation pathways\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function with specific substrate phenotype, replicated across multiple substrates and pathways in one study; foundational paper replicated by subsequent work\",\n      \"pmids\": [\"17043138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SEL1L nucleates a protein complex for dislocation of misfolded glycoproteins, interacting with AUP1, UBXD8, UBC6e, and OS9 as functionally important components; mutagenesis and dominant-negative versions confirmed the functional importance of these interactions.\",\n      \"method\": \"Biochemical pulldown/co-IP of SEL1L-interacting proteins, mass spectrometry, mutagenesis, dominant-negative constructs\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, MS-based interactome, mutagenesis validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"18711132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"OS-9 and XTP3-B bind ERAD substrates and, through the SEL1L adaptor, connect to the ER-membrane-embedded ubiquitin ligase Hrd1; the MRH domains of OS-9/XTP3-B are required for interaction with SEL1L but not substrate; GRP94, together with Hrd1 and SEL1L, is required for degradation of mutant alpha1-antitrypsin.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ERAD substrate degradation assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, functional knockdown with substrate phenotype, domain mapping, replicated across multiple labs\",\n      \"pmids\": [\"18264092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"XTP3-B long isoform associates with the HRD1-SEL1L membrane-anchored ubiquitin ligase complex and BiP, forming a ~27S ER quality control scaffold complex; this large complex also incorporates OS-9 but not gp78.\",\n      \"method\": \"Immunoprecipitation, sucrose density gradient centrifugation, ERAD substrate degradation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus orthogonal sucrose gradient fractionation, multiple substrates tested\",\n      \"pmids\": [\"18502753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EDEM1 binds nonnative proteins in a glycan-independent manner and uses its mannosidase-like domain (not catalytic activity) to associate with the ER membrane adaptor SEL1L; mutation of the EDEM1 mannosidase-like domain diminishes its association with SEL1L, linking substrate recognition to delivery to the SEL1L-containing dislocation complex.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis, kifunensine treatment, ERAD degradation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mutagenesis and pharmacological inhibition, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"19524542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Disposal of soluble ERAD-L substrates (ERAD-LS) is strictly dependent on HRD1, SEL1L, and the ER lectins OS-9 and XTP3-B; tethering the same substrates to the membrane (ERAD-LM) renders these factors dispensable, revealing pathway-selective roles for SEL1L.\",\n      \"method\": \"siRNA knockdown, pulse-chase degradation assay with defined ERAD-LS and ERAD-LM substrates\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockdown with multiple substrate classes, replicated findings, mechanistic distinction established\",\n      \"pmids\": [\"20100910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In mammalian cells (unlike yeast), SEL1L is the unstable partner: its half-life is reduced when HRD1 is silenced, and transiently expressed SEL1L is rapidly degraded unless HRD1 is coexpressed; HRD1 association stabilizes SEL1L via interaction at the SEL1L transmembrane domain; free SEL1L is degraded by the ubiquitin-proteasome pathway via an E3 ligase other than HRD1.\",\n      \"method\": \"siRNA knockdown, cycloheximide chase, co-immunoprecipitation, proteasome inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KD, CHX chase, co-IP, pharmacological inhibition) with mechanistic clarity; replicated in subsequent studies\",\n      \"pmids\": [\"21454652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SEL1L forms a complex with cytosolic LC3-I that acts as an ERAD tuning receptor, mediating COPII-independent, vesicle-mediated removal of lumenal ERAD regulators EDEM1 and OS-9 from the ER; expression of misfolded polypeptides inhibits SEL1L:LC3-I-mediated segregation, raising ERAD activity without UPR induction.\",\n      \"method\": \"Co-immunoprecipitation, vesicle fractionation, siRNA knockdown, live-cell imaging\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, fractionation, and functional KD with defined regulatory phenotype; novel mechanism with multiple orthogonal validations\",\n      \"pmids\": [\"22633958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATF6 (a transmembrane UPR sensor/transducer) is an ERAD substrate that requires SEL1L for proteasomal degradation despite its transmembrane nature; degradation is dependent on the luminal region of ATF6 and on mannose trimming (inhibited by kifunensine), defining a novel ERAD-LM subclass requiring SEL1L.\",\n      \"method\": \"Gene knockout (DT40 cells), pulse-chase assay, chimeric protein analysis, kifunensine pharmacological inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — genetic KO with domain-swap chimeras, pharmacological inhibition, and defined substrate phenotype in a clean cell model\",\n      \"pmids\": [\"24043630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ERdj5 interacts directly with SEL1L's N-terminal luminal domain, linking ERdj5 to the Hrd1 complex; SEL1L itself binds cholera toxin CTA subunit and facilitates its retrotranslocation; EDEM1 and OS-9 do not play significant roles in CTA1 retrotranslocation.\",\n      \"method\": \"Loss-of-function and gain-of-function approaches, co-immunoprecipitation, domain mapping\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping and functional assay, but single lab study\",\n      \"pmids\": [\"23363602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sel1L is required for Hrd1 protein stability in mammalian cells (unlike the reciprocal relationship in yeast); acute Sel1L loss in mice causes rapid Hrd1 degradation, impaired ERAD function, ER stress, translational attenuation, and ribosomal subunit aggregation, leading to pancreatic atrophy and death within 3 weeks.\",\n      \"method\": \"Inducible knockout mouse model, biochemical fractionation, mass spectrometry, pulse-chase ERAD assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo inducible KO with biochemical, proteomic, and functional validation; replicated in multiple tissue contexts\",\n      \"pmids\": [\"24453213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SEL1L physically interacts with and stabilizes the LPL–LMF1 maturation complex in the ER, promoting LPL secretion independent of its Hrd1-mediated ERAD function; in Sel1L-deficient adipocytes, LPL is retained in the ER, forms aggregates, and is degraded by autophagy rather than ERAD.\",\n      \"method\": \"Adipocyte-specific knockout mouse, co-immunoprecipitation, pulse-chase secretion assay, autophagy inhibitor treatment\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, reciprocal co-IP, and mechanistic pathway distinction (ERAD-independent function), multiple orthogonal methods\",\n      \"pmids\": [\"25066055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The inherent instability of human SEL1L resides in its transmembrane domain; association of HRD1 with the SEL1L transmembrane domain restores SEL1L stability; the SEL1L luminal domain retains misfolded cargo in the ER and can inhibit HRD1-mediated degradation when overexpressed without the transmembrane domain.\",\n      \"method\": \"Deletion mutagenesis, co-immunoprecipitation, cycloheximide chase, ERAD substrate degradation assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis combined with stability assay and functional ERAD readout, single lab\",\n      \"pmids\": [\"26471130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The Hrd1-Sel1L membrane complex conducts Akita proinsulin (MIDY mutant) from the ER lumen to the cytosol for proteasomal degradation via p97; PDI reduces proinsulin disulfide bonds and primes Akita for ERAD; efficient PDI engagement is linked to Hrd1 availability, suggesting retrotranslocation coordination on the lumenal side.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, pulse-chase retrotranslocation assay, PDI redox assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple KD targets with substrate-specific readout, novel PDI-priming mechanism, single lab\",\n      \"pmids\": [\"26269577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the mouse SEL1L central domain (SLR motifs 5–9) reveals a homodimer with two-fold head-to-tail symmetry mediated by domain-swapped SLR motif 9; the SLR-C region (SLR motifs 10–11) directly interacts with the N-terminus luminal loops of HRD1; full-length SEL1L forms self-oligomers via the central domain in mammalian cells.\",\n      \"method\": \"X-ray crystallography, co-immunoprecipitation, mutagenesis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with domain mapping and biochemical validation of HRD1 interaction, multiple orthogonal methods\",\n      \"pmids\": [\"27064360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Yeast Hrd3 (SEL1L ortholog) has a direct and critical role in ERAD beyond stabilizing Hrd1; using a Usa1-based approach to maintain Hrd1 in the absence of Hrd3, Hrd3 was shown to be required for E3 activity of Hrd1, rather than substrate or E2 recruitment to Hrd1.\",\n      \"method\": \"Genetic epistasis in yeast (Saccharomyces cerevisiae), Usa1-based Hrd1 stabilization system, ERAD substrate degradation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — elegant genetic dissection with controlled epistasis, rigorous in vivo ERAD assays in yeast ortholog\",\n      \"pmids\": [\"27170191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The Sel1L-Hrd1 ERAD complex selectively recognizes and targets the pre-B cell receptor (pre-BCR) for proteasomal degradation in a BiP-dependent manner; loss of Sel1L in B cell precursors causes pre-BCR accumulation intracellularly and at the cell surface, leading to persistent pre-BCR signaling and a developmental block at the large-to-small pre-B cell transition.\",\n      \"method\": \"B cell-specific knockout mouse, co-immunoprecipitation, flow cytometry, cell surface staining\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined substrate (pre-BCR), co-IP, and mechanistic pathway placement\",\n      \"pmids\": [\"27568564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of yeast Hrd1 (SEL1L ortholog Hrd3 complex) reveals Hrd1 forms a dimer within the membrane with one or two Hrd3 molecules on the luminal side; each Hrd1 molecule has 8 transmembrane segments forming an aqueous cavity extending from the cytosol almost to the ER lumen with a lateral gate, suggesting Hrd1 forms a retro-translocation channel.\",\n      \"method\": \"Cryo-electron microscopy structural determination\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure of the Hrd1-Hrd3 complex at near-atomic resolution; directly relevant to SEL1L (Hrd3) binding to Hrd1 at luminal side\",\n      \"pmids\": [\"28682307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SEL1L-dependent ERAD substrates require Derlin2/3 and Herp1/2 for degradation, defining an HRD1-engaged retrotranslocon route 1 (requiring SEL1L, Derlin2 or Derlin3, and Herp1 or Herp2), distinct from a second HRD1-engaged route that does not require these factors.\",\n      \"method\": \"Gene knockout in chicken DT40 cells, pulse-chase ERAD degradation assay, multiple substrate analysis\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO of multiple pathway components, systematic substrate-dependent pathway mapping\",\n      \"pmids\": [\"28552883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The Sel1L-Hrd1 ERAD complex controls FGF21 transcription by regulating ubiquitination and turnover of ER-resident transcription factor CREBH, thereby controlling nuclear abundance of CREBH; hepatic Sel1L deletion elevates circulating FGF21 via CREBH accumulation, while PPARα-mediated Fgf21 transcription is unaffected.\",\n      \"method\": \"Liver-specific knockout mouse, ubiquitination assay, nuclear fractionation, reporter assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with biochemical ubiquitination assay, substrate-specific effect (CREBH vs PPARα), mechanistic pathway placement\",\n      \"pmids\": [\"30389665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HCMV UL148 interacts with SEL1L by mass spectrometry co-immunoprecipitation; knockdown of SEL1L or Hrd1 stabilizes viral glycoprotein gO, demonstrating gO is a constitutive ERAD substrate of the SEL1L-Hrd1 complex; gO interaction with OS-9 is also stabilized by SEL1L silencing.\",\n      \"method\": \"Mass spectrometry co-immunoprecipitation, siRNA knockdown, pulse-chase assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based co-IP and siRNA knockdown with substrate phenotype, single lab\",\n      \"pmids\": [\"29997207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Sel1L-Hrd1 ERAD controls β cell identity via TGF-β signaling by mediating the degradation of TGF-β receptor 1 (TGFBR1); Sel1L deficiency is not associated with β cell apoptosis but loss of β cell identity; inhibition of TGF-β signaling in Sel1L-deficient β cells restores expression of β cell maturation markers and insulin content.\",\n      \"method\": \"β cell-specific knockout mouse, single-cell RNA-seq, TGF-β receptor stability assay, pharmacological TGF-β inhibition\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, scRNA-seq, substrate identification, pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"32182217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cytomegalovirus M50 protein mediates IRE1 degradation by tethering IRE1 to SEL1L, facilitating SEL1L-HRD1/p97-dependent proteasomal degradation of IRE1; M50 binds both IRE1 and SEL1L simultaneously; genetic ablation of SEL1L blocks M50-dependent IRE1 degradation.\",\n      \"method\": \"SEL1L genetic ablation, co-immunoprecipitation, proteasome and p97 inhibitor treatment, pulse-chase assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with pharmacological confirmation and co-IP demonstrating ternary complex, single lab\",\n      \"pmids\": [\"33472927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SEL1L-HRD1 ERAD suppresses hepatocyte proliferation and tumorigenesis by degrading WNT5A; nascent WNT5A is misfolding-prone and a quality-control ERAD substrate; in ERAD-deficient cells WNT5A accumulates as high-molecular-weight aggregates in the ER, causing loss-of-function and loss of WNT5A-mediated suppression of hepatocyte proliferation.\",\n      \"method\": \"Hepatocyte-specific knockout mouse, proteomics screen, co-immunoprecipitation, substrate stability assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO, proteomics substrate identification, biochemical validation, single lab\",\n      \"pmids\": [\"36238898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SEL1L-HRD1 ERAD ubiquitinates and targets nascent STING protein for proteasomal degradation in the basal state, limiting the size of the activable STING pool; this ERAD-mediated regulation of STING is uncoupled from ER stress and IRE1α; SEL1L or HRD1 deficiency in macrophages amplifies STING signaling and antiviral/antitumor immunity.\",\n      \"method\": \"Macrophage-specific knockout mouse, ubiquitination assay, co-immunoprecipitation, viral infection and tumor growth assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, ubiquitination assay, in vivo functional phenotypes, substrate identification with multiple orthogonal approaches\",\n      \"pmids\": [\"37142791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SEL1L-HRD1 ERAD in hepatocytes controls systemic iron homeostasis by degrading ceruloplasmin (CP); CP is a bona fide ERAD substrate that, in the absence of ERAD, accumulates in the ER and is shunted to refolding, leading to elevated secretion and altered iron distribution; SEL1L-HRD1 also degrades disease-causing CP mutants.\",\n      \"method\": \"Hepatocyte-specific knockout mouse, proteomics, co-immunoprecipitation, substrate stability assay, iron homeostasis measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, proteomics, biochemical validation of substrate, physiological phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"36595688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SEL1L deficiency in CD8+ T cells leads to excessive PERK-ATF4-CHOP-Bim-mediated ER stress and aberrant mTORC1/c-MYC activation via enhanced IL-15 receptor α and β chain expression; PERK inhibition rescues SEL1L-deficient CD8+ T cell survival defects; IRE1α deficiency decreases mTORC1 signaling in Sel1l-/- naïve CD8+ T cells by downregulating IL-15 receptor α chain.\",\n      \"method\": \"T cell-specific conditional knockout, single-cell transcriptomics, PERK inhibitor treatment, adoptive transfer\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with scRNA-seq and pharmacological rescue, single lab, mechanistic pathway placement\",\n      \"pmids\": [\"37644166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SEL1L variant p.Ser658Pro is a pathogenic hypomorphic mutation that reduces SEL1L protein stability and attenuates SEL1L-HRD1 interaction (likely via electrostatic repulsion between SEL1L F668 and HRD1 Y30); SEL1L is required for recruitment of E2 enzyme UBE2J1 and DERLIN to HRD1, establishing SEL1L-HRD1 interaction as a prerequisite for functional ERAD complex formation.\",\n      \"method\": \"Knock-in mouse model, biochemical co-immunoprecipitation, proteomics interactome screen, mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in model, proteomics, biochemical validation of interface residues, mechanistic dissection of complex assembly\",\n      \"pmids\": [\"38365914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Three biallelic missense variants in SEL1L (p.Gly585Asp, p.Met528Arg) and HRD1 (p.Pro398Leu) impair ERAD function at distinct steps: p.Gly585Asp disrupts substrate recruitment, p.Met528Arg disrupts SEL1L-HRD1 complex formation, and p.Pro398Leu impairs HRD1 activity; these hypomorphic variants establish the importance of SEL1L-HRD1 ERAD in human neurodevelopment.\",\n      \"method\": \"Biochemical co-immunoprecipitation, ERAD substrate degradation assay, patient-derived variant functional analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple patient variants tested biochemically with defined steps impaired, mechanistic dissection at each ERAD stage\",\n      \"pmids\": [\"37943610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The SEL1L variant p.Cys141Tyr disrupts a disulfide bond in the luminal fibronectin II domain of SEL1L, largely abolishing SEL1L-HRD1 ERAD function in part via proteasomal-mediated HRD1 self-destruction; loss of this disulfide bond leads to agammaglobulinemia (no mature B cells) and early death, establishing SEL1L fibronectin II domain as functionally critical.\",\n      \"method\": \"Patient variant characterization, biochemical stability assay, co-immunoprecipitation, B cell development analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient variant with domain-specific mechanism (disulfide bond), biochemical and functional validation, HRD1 self-destruction mechanism identified\",\n      \"pmids\": [\"37943617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A proteomics strategy identified over 100 high-confidence SEL1L-HRD1 ERAD substrates in human HEK293T cells and mouse brown adipose tissue; PIGK (catalytic subunit of GPI-transamidase complex) is a shared substrate, and SEL1L-HRD1 ERAD attenuates GPI-anchored protein biogenesis by targeting PIGK for proteasomal degradation.\",\n      \"method\": \"Proteomics substrate screen with machine learning filtering, co-immunoprecipitation, substrate degradation assay, GPI-anchored protein surface staining\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomics combined with biochemical validation, functional consequence in GPI biogenesis, multiple orthogonal methods\",\n      \"pmids\": [\"38253565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SEL1L-HRD1 ERAD in POMC-expressing neurons degrades misfolded nascent leptin receptor long isoform (LepRb), both wildtype and disease-associated Cys604Ser variant; loss of SEL1L causes ER retention of LepRb in an ER stress-independent manner, attenuating leptin signaling and predisposing mice to diet-induced obesity.\",\n      \"method\": \"POMC neuron-specific knockout mouse, co-immunoprecipitation, substrate stability and localization assay, leptin signaling assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell type-specific KO, defined substrate (LepRb), ER stress-independent mechanism established, functional metabolic phenotype\",\n      \"pmids\": [\"39343970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Purkinje cell-specific deletion of SEL1L causes early-onset progressive cerebellar ataxia with Purkinje cell loss, dilated ER, and fragmented nuclei, establishing SEL1L-HRD1 ERAD as specifically required in Purkinje cells for cerebellar homeostasis.\",\n      \"method\": \"Purkinje cell-specific (Pcp2-Cre) knockout mouse, transmission electron microscopy, behavioral motor testing, immunohistochemistry\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell type-specific KO with ultrastructural evidence and defined behavioral phenotype\",\n      \"pmids\": [\"39352758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SEL1L-HRD1 ERAD is required for fibrinogen biogenesis: degradation of misfolded endogenous fibrinogen Aα, Bβ, and γ chains by SEL1L-HRD1 is indispensable for formation of a functional fibrinogen complex; in ERAD-deficient hepatocytes, fibrinogen subunits accumulate as inclusion body components; disease-causing fibrinogen γ mutants are also SEL1L-HRD1 substrates.\",\n      \"method\": \"Hepatocyte-specific knockout mouse, proteomics, co-immunoprecipitation, substrate stability and secretion assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, proteomics, biochemical substrate validation, disease mutant analysis, multiple methods\",\n      \"pmids\": [\"39455574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Genome-wide CRISPR screens identified SEL1L as an intracellular regulator of collagen clearance via a noncanonical function distinct from its canonical ERAD role; SEL1L senses collagen biosynthesis and negatively regulates extracellular collagen clearance as a homeostatic feedback mechanism.\",\n      \"method\": \"Genome-wide CRISPR screen, loss-of-function validation, collagen clearance assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — unbiased genome-wide screen with validation, novel noncanonical function, mechanistic details limited in abstract\",\n      \"pmids\": [\"38378719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SEL1L is required for optimal CD8+ T cell bioenergetics and c-Myc expression following viral activation; loss of Sel1L limits CD8+ T cell function and memory formation after acute viral infection.\",\n      \"method\": \"T cell-specific conditional knockout mouse, viral infection model, metabolic profiling, adoptive transfer\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined functional phenotype and metabolic readout, mechanistic link to c-Myc and bioenergetics\",\n      \"pmids\": [\"38687642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of the core mammalian ERAD complex comprising OS9, SEL1L, and HRD1 reveals a dimeric assembly: SEL1L and OS9 form a claw-like configuration in the ER lumen mediating substrate engagement, while HRD1 dimerizes within the membrane for substrate translocation; pathogenic SEL1L mutations at SEL1L-OS9 (Gly585Asp) and SEL1L-HRD1 (Ser658Pro) interfaces disrupt complex formation; HRD1 variant Ala91Asp impairs HRD1 dimerization; two methionine-rich crevices flank the HRD1 dimer as putative substrate-conducting channels.\",\n      \"method\": \"Cryo-EM structural determination, mutagenesis, crosslinking assays, functional ERAD validation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — first mammalian ERAD complex cryo-EM structure with mutagenesis and crosslinking validation; multiple disease variants functionally characterized\",\n      \"pmids\": [\"40661598\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SEL1L co-immunoprecipitates with β1-integrin in pancreatic β-cells; downmodulation of SEL1L negatively influences cell adhesion on matrix components and cell proliferation via altered ERK signaling; SEL1L absence strongly inhibits glucose-stimulated insulin secretion in isolated pancreatic islets, a phenotype rescued by ectopic β1-integrin expression.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, adhesion assay, ERK signaling assay, insulin secretion assay, rescue experiment\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP and functional rescue, multiple cellular readouts, but single lab with primarily descriptive functional phenotype\",\n      \"pmids\": [\"24324549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Excess free SEL1L (not associated with HRD1) generates cytosolic degradation intermediates when proteasome activity is inhibited; these C-terminal Pro-rich region fragments stimulate aggregation of polyglutamine-expanded Huntingtin protein by interacting with aggregation-prone proteins; OS-9 and XTP3-B inhibit SEL1L degradation.\",\n      \"method\": \"Proteasome inhibitor treatment, co-immunoprecipitation, co-aggregation assay, deletion mutagenesis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined biochemical mechanism with domain mapping and functional aggregation assay, single lab\",\n      \"pmids\": [\"33576152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIRT4 deacetylates SEL1L at lysine 547, which increases HRD1 protein levels and the SEL1L-HRD1 complex; increased SEL1L-HRD1 complex reduces stability of mitochondrial protein ALKBH1, leading to blocked transcription of mitochondrial DNA-coded genes and mitochondrial damage in pancreatic cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, deacetylation assay, siRNA knockdown, ALKBH1 stability assay\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical deacetylation assay and co-IP with functional downstream readout, single lab\",\n      \"pmids\": [\"37146713\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SEL1L is an ER-resident single-pass transmembrane adaptor protein that forms the core of the mammalian SEL1L-HRD1 ERAD complex, where it stabilizes the E3 ubiquitin ligase HRD1, recruits substrate-recognition factors (OS-9, XTP3-B, EDEM1, ERdj5) and retrotranslocon components (Derlins, Herp) via its luminal SEL1L-repeat (SLR) domains, facilitates recruitment of the E2 enzyme UBE2J1 to HRD1, and coordinates ubiquitination and proteasomal degradation of a wide range of misfolded luminal and select transmembrane ERAD substrates including STING, TGF-β receptor 1, CREBH, ceruloplasmin, LepRb, pre-BCR, PIGK, WNT5A, fibrinogen chains, and others; the recently solved cryo-EM structure shows SEL1L and OS9 form a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel, and pathogenic hypomorphic mutations at the SEL1L-OS9 and SEL1L-HRD1 interfaces cause neurodevelopmental disorders and agammaglobulinemia in humans.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SEL1L is an ER-resident single-pass transmembrane adaptor that forms the core of the mammalian SEL1L-HRD1 ER-associated degradation (ERAD) machinery, where it nucleates the dislocation complex required to extract and degrade misfolded ER proteins [#0, #1]. Through its luminal SEL1L-repeat (SLR) domains, SEL1L bridges substrate-recognition lectins and chaperones — OS-9, XTP3-B, EDEM1, and ERdj5 — to the membrane-embedded E3 ligase HRD1, assembling a large ER quality-control scaffold that channels glycoprotein and other substrates toward ubiquitination [#1, #2, #3, #4, #9]. This handoff is pathway-selective: degradation of soluble luminal substrates strictly depends on SEL1L, OS-9, and XTP3-B, whereas membrane-tethered substrates can bypass these factors, and a distinct HRD1 route requires Derlins and Herp downstream of SEL1L [#5, #18]. SEL1L is essential for assembly and activity of the complex — it stabilizes HRD1 and is itself a prerequisite for recruiting the E2 enzyme UBE2J1 and Derlin to HRD1, with the two proteins reciprocally stabilizing each other through their transmembrane and luminal interfaces [#10, #27, #6]. Structurally, SEL1L homodimerizes via its central SLR domain and contacts the HRD1 luminal loops, and the core OS9-SEL1L-HRD1 assembly forms a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel [#14, #36]. Beyond bulk quality control, SEL1L-HRD1 ERAD degrades a broad and physiologically defined substrate set — STING, TGF-\\u03b2 receptor 1, CREBH, ceruloplasmin, LepRb, pre-BCR, PIGK, WNT5A, and fibrinogen chains — thereby tuning innate immune signaling, \\u03b2-cell identity, iron and lipid homeostasis, leptin signaling, B-cell development, and GPI-anchored protein biogenesis [#16, #19, #21, #24, #25, #30, #31, #33]. SEL1L also performs ERAD-independent functions, stabilizing the LPL-LMF1 maturation complex to promote lipase secretion [#11]. In humans, biallelic hypomorphic SEL1L variants that disrupt the SEL1L-OS9 or SEL1L-HRD1 interfaces or destabilize the protein cause neurodevelopmental disorders and agammaglobulinemia [#27, #28, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that the mammalian Hrd3p homolog SEL1L is a required component of the ER dislocation machinery, placing it in the pathway that extracts misfolded proteins from the ER.\",\n      \"evidence\": \"shRNA knockdown with pulse-chase degradation of misfolded RI332 and discrimination of viral US11/US2 dislocation routes\",\n      \"pmids\": [\"17043138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular interactions and complex composition not yet defined\", \"Did not identify the E3 ligase partner\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined SEL1L as the adaptor that nucleates a dislocation complex, physically linking substrate-recognition lectins OS-9 and XTP3-B to the HRD1 E3 ligase and forming a large ~27S quality-control scaffold.\",\n      \"evidence\": \"Reciprocal co-IP, mass-spec interactome, sucrose-gradient fractionation, domain mapping, and substrate degradation assays across three studies\",\n      \"pmids\": [\"18711132\", \"18264092\", \"18502753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the scaffold unresolved at atomic level\", \"How substrates are passed from lectins to HRD1 unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed substrate-recognition chaperones EDEM1 and ERdj5 deliver nonnative proteins to the SEL1L complex via direct binding to SEL1L domains, connecting recognition to dislocation.\",\n      \"evidence\": \"Co-IP with domain mutagenesis, kifunensine treatment, and degradation assays (EDEM1, 2009; ERdj5/CTA, 2013)\",\n      \"pmids\": [\"19524542\", \"23363602\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ERdj5 finding from a single lab\", \"Order of chaperone engagement relative to lectins not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved that SEL1L's requirement is substrate-topology-selective — strictly needed for soluble luminal ERAD substrates but dispensable when substrates are membrane-tethered.\",\n      \"evidence\": \"siRNA knockdown with defined ERAD-LS vs ERAD-LM substrate pulse-chase\",\n      \"pmids\": [\"20100910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis for topology selectivity not defined\", \"Did not enumerate the full substrate repertoire\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the mammalian-specific reciprocal stability relationship: SEL1L stabilizes HRD1 (opposite to yeast), with in vivo loss causing ERAD collapse, ER stress, and lethal pancreatic atrophy.\",\n      \"evidence\": \"Inducible knockout mice, biochemical fractionation, proteomics, and pulse-chase ERAD assay; complemented by reciprocal stabilization studies via the TM domain\",\n      \"pmids\": [\"24453213\", \"21454652\", \"26471130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase degrading free SEL1L not identified\", \"Tissue-specific essentiality determinants unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated SEL1L has ERAD-independent functions, stabilizing the LPL-LMF1 maturation complex to promote lipase secretion, separating chaperone-like roles from HRD1-mediated degradation.\",\n      \"evidence\": \"Adipocyte-specific knockout mice, co-IP, secretion pulse-chase, and autophagy inhibition\",\n      \"pmids\": [\"25066055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for SEL1L-LPL/LMF1 binding undefined\", \"Extent of other ERAD-independent clients unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided first structural insight: SEL1L homodimerizes via domain-swapped SLR motifs and directly contacts HRD1 luminal loops through its SLR-C region; yeast work showed the ortholog is directly required for HRD1 E3 activity beyond stabilization.\",\n      \"evidence\": \"X-ray crystallography of the SEL1L central domain with co-IP/mutagenesis, and yeast genetic epistasis using a Usa1-based Hrd1-stabilization system\",\n      \"pmids\": [\"27064360\", \"27170191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length mammalian complex architecture not resolved\", \"Mechanism by which SEL1L activates HRD1 catalysis unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cryo-EM of the yeast Hrd1-Hrd3 complex revealed Hrd1 forms a membrane dimer with a lateral-gated aqueous cavity, supporting a retrotranslocation channel model with the SEL1L ortholog on the luminal side.\",\n      \"evidence\": \"Cryo-electron microscopy of the Hrd1-Hrd3 complex\",\n      \"pmids\": [\"28682307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Yeast structure; mammalian complex differs\", \"How the channel accommodates folded/disulfide-bonded substrates unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the route 1 retrotranslocon: SEL1L-dependent substrates additionally require Derlin2/3 and Herp1/2, distinguishing them from a second HRD1 route, refining how SEL1L substrates exit the ER.\",\n      \"evidence\": \"Genetic knockout in DT40 cells with multi-substrate pulse-chase\",\n      \"pmids\": [\"28552883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rules determining route assignment per substrate not defined\", \"Physical organization of Derlin/Herp within the complex unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanded the physiological substrate repertoire and disease relevance, showing SEL1L-HRD1 ERAD degrades specific clients (STING, TGFBR1, CREBH, ceruloplasmin, pre-BCR) in an ER-stress-uncoupled manner to control immunity, \\u03b2-cell identity, metabolism, and B-cell development.\",\n      \"evidence\": \"Multiple tissue-specific knockout mice with ubiquitination assays, co-IP, proteomics, and functional/physiological readouts\",\n      \"pmids\": [\"37142791\", \"32182217\", \"30389665\", \"36595688\", \"27568564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How specific substrates are selected from the proteome unclear\", \"Whether substrate sets overlap or differ across tissues not fully mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Systematic proteomics and tissue-specific knockouts established a >100-substrate landscape (including PIGK, WNT5A, LepRb, fibrinogen chains) and demonstrated SEL1L-HRD1 is a prerequisite for recruiting UBE2J1 and Derlin to HRD1, with human hypomorphic variants causing neurodevelopmental disorders and agammaglobulinemia.\",\n      \"evidence\": \"Proteomics substrate screens, knock-in and conditional knockout mice, patient-variant biochemical interface mapping, and degradation assays\",\n      \"pmids\": [\"38253565\", \"39343970\", \"39455574\", \"27170191\", \"38365914\", \"37943610\", \"37943617\", \"36238898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype basis of distinct human syndromes incompletely explained\", \"Selectivity logic for the broad substrate set unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cryo-EM of the mammalian core OS9-SEL1L-HRD1 complex resolved a luminal claw-like substrate-engagement platform above a dimeric HRD1 membrane channel and mapped pathogenic variants to specific interfaces.\",\n      \"evidence\": \"Cryo-EM structural determination with mutagenesis, crosslinking, and functional ERAD validation (preprint)\",\n      \"pmids\": [\"40661598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Substrate trajectory through the methionine-rich crevices not directly visualized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the SEL1L-HRD1 complex selects which of its many substrates and tissue contexts to act on, and the mechanistic basis of its noncanonical functions (collagen clearance, SIRT4-regulated ALKBH1 turnover, integrin/insulin secretion), remain open.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate selection determinants undefined\", \"Noncanonical roles (collagen sensing, ALKBH1) mechanistically incomplete and single-lab\", \"Regulation of complex assembly by post-translational modification (e.g. K547 deacetylation) not integrated into structural model\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 4, 9, 27]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [15, 19, 24, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 7, 11]},\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [6, 12, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 5, 10, 30]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [8, 26]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 24, 29]}\n    ],\n    \"complexes\": [\n      \"SEL1L-HRD1 ERAD complex\",\n      \"OS9-SEL1L-HRD1 core complex\",\n      \"LPL-LMF1 maturation complex\"\n    ],\n    \"partners\": [\n      \"HRD1\",\n      \"OS-9\",\n      \"XTP3-B\",\n      \"EDEM1\",\n      \"ERdj5\",\n      \"UBE2J1\",\n      \"DERL2\",\n      \"AUP1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}