{"gene":"STT3A","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1995,"finding":"STT3 (yeast ortholog of STT3A) is required for oligosaccharyltransferase (OTase) activity in vivo and in vitro; depletion of STT3 results in loss of transferase activity and deficiency in assembly of the OTase complex. A mutation in STT3 alters substrate specificity such that glycosyl transfer from incomplete lipid-linked oligosaccharides is greatly reduced, while transfer of full-length Glc3Man9GlcNAc2 is relatively unaffected.","method":"Genetic screen in S. cerevisiae, in vitro OTase activity assays, STT3 depletion experiments, synthetic lethal analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assays combined with in vivo genetics and complex assembly studies; foundational mechanistic paper replicated by subsequent work","pmids":["7588624"],"is_preprint":false},{"year":1995,"finding":"STT3 (yeast, encoding a protein ~60% identical to its human homolog) is essential for protein glycosylation and functions in the PKC1/STT1 pathway; stt3 mutants are defective in protein glycosylation as shown by pulse-chase experiments.","method":"Pulse-chase glycosylation assays, genetic epistasis with PKC1/STT1 pathway, staurosporine/temperature sensitivity phenotyping in S. cerevisiae","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pulse-chase assay plus genetic phenotyping, single lab, corroborates PMID 7588624","pmids":["7590309"],"is_preprint":false},{"year":1996,"finding":"The human STT3A protein (then designated ITM1/B5) is a highly hydrophobic integral membrane protein of ~80.5 kDa with 10–14 predicted transmembrane domains; it is 60% similar to yeast STT3 and 58% similar to C. elegans T12A2.2, establishing it as part of a conserved transmembrane protein family. The gene (Itm1) maps to mouse chromosome 9.","method":"cDNA cloning from fetal mouse mandibular condyle and human testis libraries, sequence analysis, database similarity searches, genetic mapping","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cloning and sequence characterization with cross-species conservation; molecular identification without functional assay","pmids":["8838310"],"is_preprint":false},{"year":2013,"finding":"Homozygous missense mutation p.Val626Ala in STT3A causes a congenital disorder of glycosylation (CDG) characterized by neurologic abnormalities, hypotonia, intellectual disability, and failure to thrive. The mutation impairs glycosylation of a GFP biomarker, reduces glycosylation of STT3A-specific acceptor substrates in patient fibroblasts, and expression of the mutant allele in STT3A-deficient HeLa cells fails to rescue glycosylation. STT3A-CDG preferentially affects transferrin glycosylation, distinguishing it from STT3B-CDG.","method":"Patient fibroblast glycosylation assays, GFP biomarker glycosylation rescue experiments, STT3A-deficient HeLa cell complementation, biochemical analysis of acceptor substrate specificity","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (patient cells, cell-line complementation, biomarker rescue) in a single focused study with clear functional readout","pmids":["23842455"],"is_preprint":false},{"year":2019,"finding":"Quantitative glycoproteomics of ~1,000 acceptor sites in wild-type versus STT3A-deficient cells revealed that STT3A-dependent sites include those with suboptimal flanking sequences, sites in cysteine-rich domains, and sites requiring cotranslational glycosylation via direct interaction with the protein translocation channel. STT3A deficiency causes hyperglycosylation of the ER chaperone GRP94 at five otherwise-silent sites; this hyperglycosylation also occurs in wild-type cells treated with ER stress inducers.","method":"Quantitative glycoproteomics in STT3A knockout and wild-type HEK cells, site-occupancy analysis, ER stress induction experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative glycoproteomics with ~1,000 sites, KO cells, multiple conditions including ER stress; comprehensive mechanistic mapping","pmids":["31296534"],"is_preprint":false},{"year":2017,"finding":"The single-subunit STT3A ortholog from Trypanosoma brucei (TbSTT3A) was recombinantly expressed and characterized: charged residues at the +1 position of the NxS/T sequon inhibit glycan transfer; an acidic residue at -2 increases catalytic turnover but is not essential (unlike bacterial OST); polyprenyl tail length but not double-bond stereochemistry determines lipid-linked oligosaccharide (LLO) analog affinity; phosphonate LLO analogs act as competitive inhibitors.","method":"Recombinant protein expression and purification, in vitro activity assays with synthetic fluorescent acceptor peptides and synthetic LLO analogs, kinetic analysis","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro enzymatic system with synthetic substrates, mutagenesis-equivalent substrate variation, competitive inhibition analysis","pmids":["28204532"],"is_preprint":false},{"year":2019,"finding":"STT3A-OST complex mediates cotranslational N-glycosylation of HSV-1 envelope glycoproteins gC and gD as the primary OST isoform; STT3B-OST can partially compensate. Cells lacking STT3B activity and treated with the OST inhibitor NGI-1 (which targets STT3A) show cell-type-dependent HSV-1 dysfunction, demonstrating the essentiality of STT3A-mediated cotranslational N-glycosylation for HSV-1 infectivity.","method":"STT3A/STT3B subunit knockout HEK293 cell lines, NGI-1 pharmacological inhibition, plaque-forming unit assays, Western blotting of viral envelope glycoproteins","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO combined with pharmacological inhibition, two orthogonal readouts (glycosylation and infectivity), clean dissection of STT3A vs STT3B contributions","pmids":["30811219"],"is_preprint":false},{"year":2021,"finding":"Heterozygous missense variants in STT3A located in the active/catalytic site cause an autosomal-dominant CDG with skeletal anomalies, short stature, macrocephaly, intellectual disability, and increased muscle tone. Expression of homologous variants in yeast STT3 in wild-type background induces glycosylation defects of carboxypeptidase Y and worsens glycosylation in stt3-7 hypomorphic yeast, supporting a dominant-negative mechanism. Patient fibroblasts show normal STT3A mRNA/protein but abnormal glycosylation.","method":"Clinical genetics, 3D structural modeling of OST complex, yeast complementation assays with CPY glycosylation readout, patient fibroblast biochemical analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast functional complementation with CPY glycosylation assay, structural modeling, and patient fibroblast biochemistry; multiple orthogonal methods","pmids":["34653363"],"is_preprint":false},{"year":2022,"finding":"TGF-β1 upregulates STT3A expression through c-Jun binding to the STT3A promoter; STT3A transfers N-linked glycans to PD-L1 in NPC cells, stabilizing PD-L1 and enabling immune evasion. Inhibition of TGF-β1 reduces glycosylated PD-L1 and enhances cytotoxic T-cell function against NPC cells.","method":"ChIP assay (c-Jun binding to STT3A promoter), co-immunoprecipitation, glycosylation assays, TGF-β1 inhibition functional assays, T-cell cytotoxicity assays","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus co-IP with functional readout, single lab, mechanistic chain established but not independently replicated","pmids":["35311117"],"is_preprint":false},{"year":2022,"finding":"Proteomics and glycoproteomics in STT3A-KO HEK293 cells revealed that STT3A deletion has greater impact on glycoprotein expression than STT3B deletion, reduces total mannosylated N-glycans and increases fucosylated N-glycans (via differential expression of glycan-processing enzymes), causes hyperglycosylation of ENPL (GRP94) via ER stress, and activates the unfolded protein response (ATF6 and PERK pathways).","method":"CRISPR/Cas9 KO, quantitative proteomics, glycoproteomics, Western blotting for UPR markers","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omic analysis in KO cells with UPR validation, single lab, corroborates PMID 31296534","pmids":["36139350"],"is_preprint":false},{"year":2024,"finding":"GMPS (guanine monophosphate synthase) promotes PD-L1 N-glycosylation in hepatocellular carcinoma by acting as an additional module connecting the Sec61 translocon channel complex to STT3A, thereby enhancing the interaction between PD-L1 and the STT3A catalytic subunit and facilitating cotranslational modification and translocation of the nascent PD-L1 peptide.","method":"Proteomic and scRNA-seq analyses, co-immunoprecipitation (GMPS–Sec61–STT3A complex), PD-L1 glycosylation assays, GMPS knockdown/inhibition functional experiments","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating three-component complex (GMPS–Sec61–STT3A), single lab, multiple functional readouts","pmids":["39690246"],"is_preprint":false},{"year":2022,"finding":"STT3A knockout or NGI-1 inhibition in lung adenocarcinoma cell lines suppresses proliferation, migration, invasion, and tumor growth in vivo; downstream, STT3A-dependent glycosylation supports activation of MAPK and PI3K/AKT signaling pathways and promotes epithelial-mesenchymal transition as identified by mass spectrometry and validated by Western blotting.","method":"CRISPR/Cas9 KO, NGI-1 pharmacological inhibition, mass spectrometry-based downstream pathway screening, Western blotting, xenograft mouse model","journal":"Translational lung cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and pharmacological inhibition with downstream pathway validation by MS and WB, single lab","pmids":["35832442"],"is_preprint":false},{"year":2015,"finding":"In Arabidopsis, loss of function of STT3a (plant ortholog) suppresses spontaneous cell death and constitutive defense responses in bir1-1 mutants without affecting SOBIR1 accumulation, suggesting STT3a-dependent ER quality control glycosylation is required for additional signaling components beyond SOBIR1 that activate immunity.","method":"Arabidopsis genetic epistasis (stt3a loss-of-function in bir1-1 background), Western blotting for SOBIR1 protein levels","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — plant ortholog (Arabidopsis), single lab, genetic suppressor result with limited molecular mechanism follow-up; symbol collision risk (plant STT3a vs human STT3A) but consistent function","pmids":["25775181"],"is_preprint":false}],"current_model":"STT3A encodes the catalytic subunit of one of two mammalian oligosaccharyltransferase complexes (STT3A-OST), which docks directly with the Sec61 protein translocation channel to catalyze cotranslational N-linked glycosylation of nascent polypeptides at NxS/T sequons; it has distinct substrate specificity from the STT3B-OST complex (preferring sites with suboptimal flanking sequences and cysteine-rich domains), is essential for glycosylation of proteins including viral envelope glycoproteins and immune checkpoint ligand PD-L1, and loss-of-function or dominant-negative mutations in its active site cause congenital disorders of glycosylation with neurological and skeletal manifestations."},"narrative":{"mechanistic_narrative":"STT3A encodes the catalytic subunit of an oligosaccharyltransferase (OST) complex that catalyzes N-linked glycosylation of nascent polypeptides at NxS/T sequons, a function conserved from yeast, where loss of the STT3 ortholog abolishes transferase activity and OST complex assembly [PMID:7588624], to the trypanosome single-subunit enzyme, whose reconstituted activity established that sequon flanking residues, polyprenyl tail length, and lipid-linked oligosaccharide structure govern catalysis [PMID:28204532]. The STT3A-OST isoform operates cotranslationally by direct interaction with the protein translocation channel, and quantitative glycoproteomics of ~1,000 acceptor sites defined its preference for sites with suboptimal flanking sequences and sites within cysteine-rich domains; its loss provokes hyperglycosylation of the ER chaperone GRP94 and activates the unfolded protein response through ATF6 and PERK [PMID:31296534, PMID:36139350]. STT3A is the primary isoform glycosylating substrates including HSV-1 envelope glycoproteins gC and gD, with STT3B-OST providing partial compensation [PMID:30811219], and it N-glycosylates and stabilizes the immune checkpoint ligand PD-L1, a reaction enhanced in tumor cells by TGF-β1/c-Jun-driven STT3A induction and by GMPS, which bridges the Sec61 translocon to STT3A to facilitate cotranslational PD-L1 modification [PMID:35311117, PMID:39690246]. Both recessive active-site missense mutations and dominant-negative heterozygous active-site variants in STT3A cause congenital disorders of glycosylation with neurological and skeletal manifestations [PMID:23842455, PMID:34653363].","teleology":[{"year":1995,"claim":"Established that STT3 is the essential determinant of oligosaccharyltransferase activity and complex assembly, and that it dictates substrate specificity toward lipid-linked oligosaccharides.","evidence":"Genetic screen, in vitro OTase assays, and depletion experiments in S. cerevisiae; pulse-chase glycosylation assays linking it to the PKC1/STT1 pathway","pmids":["7588624","7590309"],"confidence":"High","gaps":["Did not define the catalytic residues or structural basis of transfer","Mammalian isoform-specific roles not addressed"]},{"year":1996,"claim":"Identified the human STT3A protein (ITM1) as a highly hydrophobic conserved multipass membrane protein, providing the molecular entity for downstream functional work.","evidence":"cDNA cloning, sequence analysis, cross-species similarity searches, and genetic mapping","pmids":["8838310"],"confidence":"Medium","gaps":["No functional or enzymatic assay performed","Membrane topology only predicted, not experimentally resolved"]},{"year":2013,"claim":"Demonstrated that recessive active-site missense mutation causes a congenital disorder of glycosylation and defined STT3A-specific acceptor substrate defects distinct from STT3B-CDG.","evidence":"Patient fibroblast glycosylation assays, GFP biomarker rescue, and STT3A-deficient HeLa cell complementation","pmids":["23842455"],"confidence":"High","gaps":["Mechanism by which the mutation impairs catalysis not structurally resolved","Tissue-specific basis of neurological phenotype unexplained"]},{"year":2017,"claim":"Resolved sequon and lipid-substrate determinants of catalysis using a reconstituted single-subunit ortholog, defining +1 and -2 sequon effects and LLO analog requirements.","evidence":"Recombinant TbSTT3A expression with synthetic fluorescent peptide and LLO analog kinetics and competitive inhibition","pmids":["28204532"],"confidence":"High","gaps":["Trypanosome enzyme differs from mammalian multi-subunit OST","Does not address cotranslational coupling to the translocon"]},{"year":2019,"claim":"Mapped the genome-wide acceptor repertoire of STT3A, establishing its preference for suboptimal-sequon and cysteine-rich cotranslational sites and revealing GRP94 hyperglycosylation as a marker of its loss and of ER stress.","evidence":"Quantitative glycoproteomics of ~1,000 sites in STT3A-KO vs wild-type HEK cells with ER stress induction","pmids":["31296534"],"confidence":"High","gaps":["Structural basis of translocon docking not defined","Causal link between GRP94 hyperglycosylation and downstream physiology unclear"]},{"year":2019,"claim":"Demonstrated STT3A as the primary OST isoform glycosylating viral envelope glycoproteins required for HSV-1 infectivity, with partial STT3B compensation.","evidence":"STT3A/STT3B knockout HEK293 cells, NGI-1 inhibition, plaque assays, and Western blotting of viral glycoproteins","pmids":["30811219"],"confidence":"High","gaps":["Cell-type dependence of compensation not mechanistically explained","Specific viral glycosites not enumerated"]},{"year":2022,"claim":"Linked STT3A loss to broad glycoproteome remodeling, altered glycan processing, and unfolded protein response activation, extending its physiological footprint beyond direct acceptor sites.","evidence":"CRISPR KO with quantitative proteomics, glycoproteomics, and UPR marker Western blotting","pmids":["36139350"],"confidence":"Medium","gaps":["Single lab, corroborates but does not independently extend prior glycoproteomics","Causal ordering of UPR activation vs glycan changes unresolved"]},{"year":2022,"claim":"Connected STT3A to cancer signaling and immune evasion by showing TGF-β1/c-Jun-driven STT3A induction glycosylates and stabilizes PD-L1, and that STT3A supports MAPK and PI3K/AKT signaling and EMT in lung adenocarcinoma.","evidence":"ChIP, co-IP, glycosylation and T-cell cytotoxicity assays in NPC cells; CRISPR KO, NGI-1 inhibition, MS pathway screening, and xenografts in lung adenocarcinoma","pmids":["35311117","35832442"],"confidence":"Medium","gaps":["Direct PD-L1 acceptor sites not mapped in these studies","Single-lab mechanistic chains not independently replicated"]},{"year":2024,"claim":"Identified GMPS as an accessory module bridging the Sec61 translocon to STT3A to enhance cotranslational PD-L1 glycosylation, refining the architecture of substrate delivery to the catalytic subunit.","evidence":"Proteomics, scRNA-seq, co-IP of the GMPS–Sec61–STT3A complex, and GMPS knockdown PD-L1 glycosylation assays in HCC","pmids":["39690246"],"confidence":"Medium","gaps":["Stoichiometry and structural basis of the GMPS–Sec61–STT3A interaction undefined","Single Co-IP-based complex, generality beyond PD-L1 untested"]},{"year":null,"claim":"A high-resolution structural model of the human STT3A-OST complex docked to the Sec61 translocon, and the basis for its isoform-specific acceptor selection in vivo, remain to be established.","evidence":"","pmids":[],"confidence":"High","gaps":["No human STT3A-OST/Sec61 structure in the corpus","Determinants partitioning substrates between STT3A and STT3B not fully resolved at residue level"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,5,4]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,5,4]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,9]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,4,3]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,9]}],"complexes":["STT3A-OST (oligosaccharyltransferase) complex","Sec61 translocon channel"],"partners":["STT3B","SEC61","GMPS","PD-L1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P46977","full_name":"Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit STT3A","aliases":["B5","Integral membrane protein 1","Transmembrane protein TMC"],"length_aa":705,"mass_kda":80.5,"function":"Catalytic subunit of the oligosaccharyl transferase (OST) complex that catalyzes the initial transfer of a defined glycan (Glc(3)Man(9)GlcNAc(2) in eukaryotes) from the lipid carrier dolichol-pyrophosphate to an asparagine residue within an Asn-X-Ser/Thr consensus motif in nascent polypeptide chains, the first step in protein N-glycosylation (PubMed:19167329, PubMed:31296534, PubMed:31831667, PubMed:34653363, PubMed:38670073, PubMed:39509507). N-glycosylation occurs cotranslationally and the complex associates with the Sec61 complex at the channel-forming translocon complex that mediates protein translocation across the endoplasmic reticulum (ER) (PubMed:19167329, PubMed:31296534, PubMed:31831667, PubMed:34653363, PubMed:38670073, PubMed:39509507). All subunits are required for a maximal enzyme activity (PubMed:19167329, PubMed:31831667, PubMed:34653363). This subunit contains the active site and the acceptor peptide and donor lipid-linked oligosaccharide (LLO) binding pockets (PubMed:19167329). STT3A is present in the majority of OST complexes and mediates cotranslational N-glycosylation of most sites on target proteins, while STT3B-containing complexes are required for efficient post-translational glycosylation and mediate glycosylation of sites that have been skipped by STT3A (PubMed:19167329, PubMed:38670073, PubMed:39509507). STT3A-containing OST-A complex is also required to prevent hyperglycosylation of some target proteins by preventing glycosylation of facultative sites before folding of target proteins is completed (PubMed:39509507)","subcellular_location":"Endoplasmic reticulum; Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/P46977/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STT3A","classification":"Not Classified","n_dependent_lines":266,"n_total_lines":1208,"dependency_fraction":0.22019867549668873},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000134910","cell_line_id":"CID000181","localizations":[{"compartment":"er","grade":3}],"interactors":[{"gene":"DAD1","stoichiometry":10.0},{"gene":"DDOST","stoichiometry":10.0},{"gene":"OSTC","stoichiometry":10.0},{"gene":"RPN2","stoichiometry":10.0},{"gene":"MLEC","stoichiometry":10.0},{"gene":"C4ORF32","stoichiometry":10.0},{"gene":"FKBP8","stoichiometry":4.0},{"gene":"TIA1","stoichiometry":4.0},{"gene":"ACLY","stoichiometry":0.2},{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000181","total_profiled":1310},"omim":[{"mim_id":"619714","title":"CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Iw, AUTOSOMAL DOMINANT; CDG1WAD","url":"https://www.omim.org/entry/619714"},{"mim_id":"619029","title":"KERATINOCYTE-ASSOCIATED PROTEIN 2; KRTCAP2","url":"https://www.omim.org/entry/619029"},{"mim_id":"619023","title":"OLIGOSACCHARYLTRANSFERASE COMPLEX, NONCATALYTIC SUBUNIT; OSTC","url":"https://www.omim.org/entry/619023"},{"mim_id":"618932","title":"OLIGOSACCHARYLTRANSFERASE COMPLEX, SUBUNIT 4, NONCATALYTIC; OST4","url":"https://www.omim.org/entry/618932"},{"mim_id":"617515","title":"RHOMBOID DOMAIN-CONTAINING 1; RHBDD1","url":"https://www.omim.org/entry/617515"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"parathyroid gland","ntpm":368.8}],"url":"https://www.proteinatlas.org/search/STT3A"},"hgnc":{"alias_symbol":["TMC","MGC9042","STT3-A"],"prev_symbol":["ITM1"]},"alphafold":{"accession":"P46977","domains":[{"cath_id":"-","chopping":"168-324","consensus_level":"medium","plddt":88.041,"start":168,"end":324},{"cath_id":"3.40.50.12610","chopping":"500-693","consensus_level":"high","plddt":92.0358,"start":500,"end":693}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P46977","model_url":"https://alphafold.ebi.ac.uk/files/AF-P46977-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P46977-F1-predicted_aligned_error_v6.png","plddt_mean":88.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STT3A","jax_strain_url":"https://www.jax.org/strain/search?query=STT3A"},"sequence":{"accession":"P46977","fasta_url":"https://rest.uniprot.org/uniprotkb/P46977.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P46977/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P46977"}},"corpus_meta":[{"pmid":"26157030","id":"PMC_26157030","title":"Tmc 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A mutation in STT3 alters substrate specificity such that glycosyl transfer from incomplete lipid-linked oligosaccharides is greatly reduced, while transfer of full-length Glc3Man9GlcNAc2 is relatively unaffected.\",\n      \"method\": \"Genetic screen in S. cerevisiae, in vitro OTase activity assays, STT3 depletion experiments, synthetic lethal analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assays combined with in vivo genetics and complex assembly studies; foundational mechanistic paper replicated by subsequent work\",\n      \"pmids\": [\"7588624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"STT3 (yeast, encoding a protein ~60% identical to its human homolog) is essential for protein glycosylation and functions in the PKC1/STT1 pathway; stt3 mutants are defective in protein glycosylation as shown by pulse-chase experiments.\",\n      \"method\": \"Pulse-chase glycosylation assays, genetic epistasis with PKC1/STT1 pathway, staurosporine/temperature sensitivity phenotyping in S. cerevisiae\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pulse-chase assay plus genetic phenotyping, single lab, corroborates PMID 7588624\",\n      \"pmids\": [\"7590309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human STT3A protein (then designated ITM1/B5) is a highly hydrophobic integral membrane protein of ~80.5 kDa with 10–14 predicted transmembrane domains; it is 60% similar to yeast STT3 and 58% similar to C. elegans T12A2.2, establishing it as part of a conserved transmembrane protein family. The gene (Itm1) maps to mouse chromosome 9.\",\n      \"method\": \"cDNA cloning from fetal mouse mandibular condyle and human testis libraries, sequence analysis, database similarity searches, genetic mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cloning and sequence characterization with cross-species conservation; molecular identification without functional assay\",\n      \"pmids\": [\"8838310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Homozygous missense mutation p.Val626Ala in STT3A causes a congenital disorder of glycosylation (CDG) characterized by neurologic abnormalities, hypotonia, intellectual disability, and failure to thrive. The mutation impairs glycosylation of a GFP biomarker, reduces glycosylation of STT3A-specific acceptor substrates in patient fibroblasts, and expression of the mutant allele in STT3A-deficient HeLa cells fails to rescue glycosylation. STT3A-CDG preferentially affects transferrin glycosylation, distinguishing it from STT3B-CDG.\",\n      \"method\": \"Patient fibroblast glycosylation assays, GFP biomarker glycosylation rescue experiments, STT3A-deficient HeLa cell complementation, biochemical analysis of acceptor substrate specificity\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (patient cells, cell-line complementation, biomarker rescue) in a single focused study with clear functional readout\",\n      \"pmids\": [\"23842455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Quantitative glycoproteomics of ~1,000 acceptor sites in wild-type versus STT3A-deficient cells revealed that STT3A-dependent sites include those with suboptimal flanking sequences, sites in cysteine-rich domains, and sites requiring cotranslational glycosylation via direct interaction with the protein translocation channel. STT3A deficiency causes hyperglycosylation of the ER chaperone GRP94 at five otherwise-silent sites; this hyperglycosylation also occurs in wild-type cells treated with ER stress inducers.\",\n      \"method\": \"Quantitative glycoproteomics in STT3A knockout and wild-type HEK cells, site-occupancy analysis, ER stress induction experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative glycoproteomics with ~1,000 sites, KO cells, multiple conditions including ER stress; comprehensive mechanistic mapping\",\n      \"pmids\": [\"31296534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The single-subunit STT3A ortholog from Trypanosoma brucei (TbSTT3A) was recombinantly expressed and characterized: charged residues at the +1 position of the NxS/T sequon inhibit glycan transfer; an acidic residue at -2 increases catalytic turnover but is not essential (unlike bacterial OST); polyprenyl tail length but not double-bond stereochemistry determines lipid-linked oligosaccharide (LLO) analog affinity; phosphonate LLO analogs act as competitive inhibitors.\",\n      \"method\": \"Recombinant protein expression and purification, in vitro activity assays with synthetic fluorescent acceptor peptides and synthetic LLO analogs, kinetic analysis\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro enzymatic system with synthetic substrates, mutagenesis-equivalent substrate variation, competitive inhibition analysis\",\n      \"pmids\": [\"28204532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"STT3A-OST complex mediates cotranslational N-glycosylation of HSV-1 envelope glycoproteins gC and gD as the primary OST isoform; STT3B-OST can partially compensate. Cells lacking STT3B activity and treated with the OST inhibitor NGI-1 (which targets STT3A) show cell-type-dependent HSV-1 dysfunction, demonstrating the essentiality of STT3A-mediated cotranslational N-glycosylation for HSV-1 infectivity.\",\n      \"method\": \"STT3A/STT3B subunit knockout HEK293 cell lines, NGI-1 pharmacological inhibition, plaque-forming unit assays, Western blotting of viral envelope glycoproteins\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO combined with pharmacological inhibition, two orthogonal readouts (glycosylation and infectivity), clean dissection of STT3A vs STT3B contributions\",\n      \"pmids\": [\"30811219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Heterozygous missense variants in STT3A located in the active/catalytic site cause an autosomal-dominant CDG with skeletal anomalies, short stature, macrocephaly, intellectual disability, and increased muscle tone. Expression of homologous variants in yeast STT3 in wild-type background induces glycosylation defects of carboxypeptidase Y and worsens glycosylation in stt3-7 hypomorphic yeast, supporting a dominant-negative mechanism. Patient fibroblasts show normal STT3A mRNA/protein but abnormal glycosylation.\",\n      \"method\": \"Clinical genetics, 3D structural modeling of OST complex, yeast complementation assays with CPY glycosylation readout, patient fibroblast biochemical analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast functional complementation with CPY glycosylation assay, structural modeling, and patient fibroblast biochemistry; multiple orthogonal methods\",\n      \"pmids\": [\"34653363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TGF-β1 upregulates STT3A expression through c-Jun binding to the STT3A promoter; STT3A transfers N-linked glycans to PD-L1 in NPC cells, stabilizing PD-L1 and enabling immune evasion. Inhibition of TGF-β1 reduces glycosylated PD-L1 and enhances cytotoxic T-cell function against NPC cells.\",\n      \"method\": \"ChIP assay (c-Jun binding to STT3A promoter), co-immunoprecipitation, glycosylation assays, TGF-β1 inhibition functional assays, T-cell cytotoxicity assays\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus co-IP with functional readout, single lab, mechanistic chain established but not independently replicated\",\n      \"pmids\": [\"35311117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Proteomics and glycoproteomics in STT3A-KO HEK293 cells revealed that STT3A deletion has greater impact on glycoprotein expression than STT3B deletion, reduces total mannosylated N-glycans and increases fucosylated N-glycans (via differential expression of glycan-processing enzymes), causes hyperglycosylation of ENPL (GRP94) via ER stress, and activates the unfolded protein response (ATF6 and PERK pathways).\",\n      \"method\": \"CRISPR/Cas9 KO, quantitative proteomics, glycoproteomics, Western blotting for UPR markers\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omic analysis in KO cells with UPR validation, single lab, corroborates PMID 31296534\",\n      \"pmids\": [\"36139350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GMPS (guanine monophosphate synthase) promotes PD-L1 N-glycosylation in hepatocellular carcinoma by acting as an additional module connecting the Sec61 translocon channel complex to STT3A, thereby enhancing the interaction between PD-L1 and the STT3A catalytic subunit and facilitating cotranslational modification and translocation of the nascent PD-L1 peptide.\",\n      \"method\": \"Proteomic and scRNA-seq analyses, co-immunoprecipitation (GMPS–Sec61–STT3A complex), PD-L1 glycosylation assays, GMPS knockdown/inhibition functional experiments\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating three-component complex (GMPS–Sec61–STT3A), single lab, multiple functional readouts\",\n      \"pmids\": [\"39690246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STT3A knockout or NGI-1 inhibition in lung adenocarcinoma cell lines suppresses proliferation, migration, invasion, and tumor growth in vivo; downstream, STT3A-dependent glycosylation supports activation of MAPK and PI3K/AKT signaling pathways and promotes epithelial-mesenchymal transition as identified by mass spectrometry and validated by Western blotting.\",\n      \"method\": \"CRISPR/Cas9 KO, NGI-1 pharmacological inhibition, mass spectrometry-based downstream pathway screening, Western blotting, xenograft mouse model\",\n      \"journal\": \"Translational lung cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and pharmacological inhibition with downstream pathway validation by MS and WB, single lab\",\n      \"pmids\": [\"35832442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In Arabidopsis, loss of function of STT3a (plant ortholog) suppresses spontaneous cell death and constitutive defense responses in bir1-1 mutants without affecting SOBIR1 accumulation, suggesting STT3a-dependent ER quality control glycosylation is required for additional signaling components beyond SOBIR1 that activate immunity.\",\n      \"method\": \"Arabidopsis genetic epistasis (stt3a loss-of-function in bir1-1 background), Western blotting for SOBIR1 protein levels\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — plant ortholog (Arabidopsis), single lab, genetic suppressor result with limited molecular mechanism follow-up; symbol collision risk (plant STT3a vs human STT3A) but consistent function\",\n      \"pmids\": [\"25775181\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STT3A encodes the catalytic subunit of one of two mammalian oligosaccharyltransferase complexes (STT3A-OST), which docks directly with the Sec61 protein translocation channel to catalyze cotranslational N-linked glycosylation of nascent polypeptides at NxS/T sequons; it has distinct substrate specificity from the STT3B-OST complex (preferring sites with suboptimal flanking sequences and cysteine-rich domains), is essential for glycosylation of proteins including viral envelope glycoproteins and immune checkpoint ligand PD-L1, and loss-of-function or dominant-negative mutations in its active site cause congenital disorders of glycosylation with neurological and skeletal manifestations.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STT3A encodes the catalytic subunit of an oligosaccharyltransferase (OST) complex that catalyzes N-linked glycosylation of nascent polypeptides at NxS/T sequons, a function conserved from yeast, where loss of the STT3 ortholog abolishes transferase activity and OST complex assembly [#0], to the trypanosome single-subunit enzyme, whose reconstituted activity established that sequon flanking residues, polyprenyl tail length, and lipid-linked oligosaccharide structure govern catalysis [#5]. The STT3A-OST isoform operates cotranslationally by direct interaction with the protein translocation channel, and quantitative glycoproteomics of ~1,000 acceptor sites defined its preference for sites with suboptimal flanking sequences and sites within cysteine-rich domains; its loss provokes hyperglycosylation of the ER chaperone GRP94 and activates the unfolded protein response through ATF6 and PERK [#4, #9]. STT3A is the primary isoform glycosylating substrates including HSV-1 envelope glycoproteins gC and gD, with STT3B-OST providing partial compensation [#6], and it N-glycosylates and stabilizes the immune checkpoint ligand PD-L1, a reaction enhanced in tumor cells by TGF-\\u03b21/c-Jun-driven STT3A induction and by GMPS, which bridges the Sec61 translocon to STT3A to facilitate cotranslational PD-L1 modification [#8, #10]. Both recessive active-site missense mutations and dominant-negative heterozygous active-site variants in STT3A cause congenital disorders of glycosylation with neurological and skeletal manifestations [#3, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that STT3 is the essential determinant of oligosaccharyltransferase activity and complex assembly, and that it dictates substrate specificity toward lipid-linked oligosaccharides.\",\n      \"evidence\": \"Genetic screen, in vitro OTase assays, and depletion experiments in S. cerevisiae; pulse-chase glycosylation assays linking it to the PKC1/STT1 pathway\",\n      \"pmids\": [\"7588624\", \"7590309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the catalytic residues or structural basis of transfer\", \"Mammalian isoform-specific roles not addressed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified the human STT3A protein (ITM1) as a highly hydrophobic conserved multipass membrane protein, providing the molecular entity for downstream functional work.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, cross-species similarity searches, and genetic mapping\",\n      \"pmids\": [\"8838310\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or enzymatic assay performed\", \"Membrane topology only predicted, not experimentally resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that recessive active-site missense mutation causes a congenital disorder of glycosylation and defined STT3A-specific acceptor substrate defects distinct from STT3B-CDG.\",\n      \"evidence\": \"Patient fibroblast glycosylation assays, GFP biomarker rescue, and STT3A-deficient HeLa cell complementation\",\n      \"pmids\": [\"23842455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the mutation impairs catalysis not structurally resolved\", \"Tissue-specific basis of neurological phenotype unexplained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved sequon and lipid-substrate determinants of catalysis using a reconstituted single-subunit ortholog, defining +1 and -2 sequon effects and LLO analog requirements.\",\n      \"evidence\": \"Recombinant TbSTT3A expression with synthetic fluorescent peptide and LLO analog kinetics and competitive inhibition\",\n      \"pmids\": [\"28204532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trypanosome enzyme differs from mammalian multi-subunit OST\", \"Does not address cotranslational coupling to the translocon\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped the genome-wide acceptor repertoire of STT3A, establishing its preference for suboptimal-sequon and cysteine-rich cotranslational sites and revealing GRP94 hyperglycosylation as a marker of its loss and of ER stress.\",\n      \"evidence\": \"Quantitative glycoproteomics of ~1,000 sites in STT3A-KO vs wild-type HEK cells with ER stress induction\",\n      \"pmids\": [\"31296534\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of translocon docking not defined\", \"Causal link between GRP94 hyperglycosylation and downstream physiology unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated STT3A as the primary OST isoform glycosylating viral envelope glycoproteins required for HSV-1 infectivity, with partial STT3B compensation.\",\n      \"evidence\": \"STT3A/STT3B knockout HEK293 cells, NGI-1 inhibition, plaque assays, and Western blotting of viral glycoproteins\",\n      \"pmids\": [\"30811219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type dependence of compensation not mechanistically explained\", \"Specific viral glycosites not enumerated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked STT3A loss to broad glycoproteome remodeling, altered glycan processing, and unfolded protein response activation, extending its physiological footprint beyond direct acceptor sites.\",\n      \"evidence\": \"CRISPR KO with quantitative proteomics, glycoproteomics, and UPR marker Western blotting\",\n      \"pmids\": [\"36139350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, corroborates but does not independently extend prior glycoproteomics\", \"Causal ordering of UPR activation vs glycan changes unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected STT3A to cancer signaling and immune evasion by showing TGF-\\u03b21/c-Jun-driven STT3A induction glycosylates and stabilizes PD-L1, and that STT3A supports MAPK and PI3K/AKT signaling and EMT in lung adenocarcinoma.\",\n      \"evidence\": \"ChIP, co-IP, glycosylation and T-cell cytotoxicity assays in NPC cells; CRISPR KO, NGI-1 inhibition, MS pathway screening, and xenografts in lung adenocarcinoma\",\n      \"pmids\": [\"35311117\", \"35832442\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PD-L1 acceptor sites not mapped in these studies\", \"Single-lab mechanistic chains not independently replicated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified GMPS as an accessory module bridging the Sec61 translocon to STT3A to enhance cotranslational PD-L1 glycosylation, refining the architecture of substrate delivery to the catalytic subunit.\",\n      \"evidence\": \"Proteomics, scRNA-seq, co-IP of the GMPS\\u2013Sec61\\u2013STT3A complex, and GMPS knockdown PD-L1 glycosylation assays in HCC\",\n      \"pmids\": [\"39690246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and structural basis of the GMPS\\u2013Sec61\\u2013STT3A interaction undefined\", \"Single Co-IP-based complex, generality beyond PD-L1 untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structural model of the human STT3A-OST complex docked to the Sec61 translocon, and the basis for its isoform-specific acceptor selection in vivo, remain to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No human STT3A-OST/Sec61 structure in the corpus\", \"Determinants partitioning substrates between STT3A and STT3B not fully resolved at residue level\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 5, 4]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 4, 3]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 9]}\n    ],\n    \"complexes\": [\n      \"STT3A-OST (oligosaccharyltransferase) complex\",\n      \"Sec61 translocon channel\"\n    ],\n    \"partners\": [\n      \"STT3B\",\n      \"Sec61\",\n      \"GMPS\",\n      \"PD-L1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}