{"gene":"TRAM1","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":1996,"finding":"TRAM1 (translocating chain-associating membrane protein) is required for cotranslational translocation of most, but not all, secretory proteins across the ER membrane in a signal sequence-dependent manner. Using reconstituted proteoliposomes, TRAM1 was shown to be dispensable for initial ribosome/nascent chain docking at the ER but essential for a subsequent step in which the nascent chain inserts into the translocation site in a protease-resistant manner. The structure of the signal sequence (length of the charged N-terminal region and hydrophobicity of the core) determines whether TRAM1 function is required.","method":"Reconstituted proteoliposomes with purified components; protease protection assay; hybrid signal sequence analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in defined proteoliposomes with multiple signal sequence variants and functional readout","pmids":["8698819"],"is_preprint":false},{"year":2006,"finding":"During co-translational integration of a viral double-spanning membrane protein into the ER, TRAM1 is sequentially adjacent to nascent transmembrane (TM) segments after their initial contact with Sec61α. Photocrosslinking experiments showed each TM segment first contacts Sec61α and subsequently contacts TRAM1, with TRAM1 crosslinking persisting for an extended period. Replacement of the first viral TM segment with a non-viral TM sequence still produced TRAM1 adducts, indicating that TRAM1 recognition does not depend solely on a specific TM sequence.","method":"Site-specific photocrosslinking during in vitro translation/integration; nascent chain adduct analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — direct photocrosslinking with multiple TM segment variants, rigorous sequential interaction mapping","pmids":["17169373"],"is_preprint":false},{"year":2011,"finding":"TRAM1 is a polytopic glycoprotein with eight transmembrane segments in the ER membrane, including several poorly hydrophobic segments. Its topology was established using photocrosslinking and truncated C-terminal reporter tag fusions, and the protein is recognized by the signal recognition particle and translocon components during its own membrane insertion. The proposed eight-TM topology was confirmed in mammalian cells expressing full-length TRAM1.","method":"Photocrosslinking; C-terminal reporter tag fusions (glycosylation and protease accessibility); full-length mammalian cell expression validation","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — two orthogonal structural/topological methods with in-cell validation","pmids":["21237175"],"is_preprint":false},{"year":2015,"finding":"TRAM1 promotes microglia M1 polarization. TRAM1 expression is strongly induced in LPS/IFN-γ-stimulated BV2 and primary microglia cells. Overexpression of TRAM1 significantly enhanced M1 polarization markers (IL-6, IL-1β, iNOS), while siRNA-mediated knockdown inhibited LPS/IFN-γ-induced M1 gene expression. TRAM1 was found to cooperate with TLR4 signaling, and is required for LPS/IFN-γ-induced activation of IRAK1, phosphorylation of TBK1 and IRF3, phosphorylation of IκB and p65, and nuclear translocation of NF-κB p65.","method":"Overexpression (Flag-TRAM1 transfection); siRNA knockdown; western blotting for signaling intermediates; immunofluorescence for NF-κB nuclear translocation; BV2 and primary microglia cell models","journal":"Journal of molecular neuroscience : MN","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD/OE with defined phenotype and pathway markers; single lab, single study","pmids":["26563450"],"is_preprint":false}],"current_model":"TRAM1 (translocating chain-associating membrane protein 1) is an eight-transmembrane ER glycoprotein that acts downstream of Sec61α in the co-translational translocation/integration pathway, facilitating insertion of nascent secretory and membrane proteins into the ER in a signal sequence-dependent manner, and additionally has been shown to promote TLR4-mediated NF-κB and IRF3 signaling and M1 microglia polarization."},"narrative":{"teleology":[{"year":1996,"claim":"Resolved whether TRAM1 participates in ribosome docking or a later translocation step: TRAM1 is dispensable for SRP-mediated targeting but essential for subsequent signal sequence–dependent nascent chain insertion, establishing it as a translocation-competence factor rather than a targeting factor.","evidence":"Reconstituted proteoliposomes with purified SRP, SR, Sec61, and TRAM1; protease protection assay with hybrid signal sequences","pmids":["8698819"],"confidence":"High","gaps":["Molecular mechanism by which signal sequence features determine TRAM1 dependence is unknown","No structural information on TRAM1–nascent chain contacts","Role in membrane protein (versus secretory protein) integration not yet examined"]},{"year":2006,"claim":"Established the sequential order of translocon contacts during multi-spanning membrane protein integration: each transmembrane segment first contacts Sec61α and then transfers to TRAM1, positioning TRAM1 as a downstream acceptor that holds TM segments after their exit from the Sec61 channel.","evidence":"Site-specific photocrosslinking during in vitro translation of a double-spanning viral membrane protein with TM segment variants","pmids":["17169373"],"confidence":"High","gaps":["Whether TRAM1 directly facilitates lateral release of TM segments into the lipid bilayer is untested","Stoichiometry and dynamics of TRAM1–Sec61 interaction during integration remain uncharacterized"]},{"year":2011,"claim":"Defined the membrane topology of TRAM1 itself as an eight-transmembrane glycoprotein containing several poorly hydrophobic TM segments, providing the first structural framework for understanding how it engages nascent chains.","evidence":"Photocrosslinking and C-terminal glycosylation/protease-accessibility reporter fusions validated in mammalian cells","pmids":["21237175"],"confidence":"High","gaps":["No high-resolution structure of TRAM1 or TRAM1–translocon complex","Which of the eight TM segments form the nascent chain contact surface is unknown"]},{"year":2015,"claim":"Identified a non-canonical role for TRAM1 in innate immune signaling: TRAM1 is induced by LPS/IFN-γ in microglia and is required for TLR4-mediated activation of NF-κB and IRF3, promoting M1 polarization.","evidence":"siRNA knockdown and overexpression in BV2 and primary microglia; western blot for IRAK1, p-TBK1, p-IRF3, p-IκB, p-p65; immunofluorescence for NF-κB nuclear translocation","pmids":["26563450"],"confidence":"Medium","gaps":["Single-lab finding not independently replicated","Whether the TLR4 signaling role depends on TRAM1's translocation function or is mechanistically distinct is unresolved","Physical interaction between TRAM1 and TLR4 pathway components not demonstrated"]},{"year":null,"claim":"A high-resolution structure of TRAM1 in the context of the Sec61 translocon is needed to explain how signal sequence features and TM segment properties determine TRAM1 dependence, and whether its reported immune signaling function is mechanistically linked to its translocation role.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of TRAM1 alone or in complex","In vivo loss-of-function phenotype in mammalian models not reported","Mechanism coupling TRAM1 to TLR4 pathway activation remains undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,2]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":["SEC61A1"],"other_free_text":[]},"mechanistic_narrative":"TRAM1 is an eight-transmembrane ER glycoprotein that functions downstream of Sec61α in the co-translational translocation pathway, facilitating the insertion of nascent secretory and membrane protein chains into the ER membrane in a signal sequence–dependent manner [PMID:8698819]. In reconstituted proteoliposomes, TRAM1 is dispensable for initial ribosome–nascent chain docking but essential for the subsequent step in which the nascent chain achieves protease-resistant insertion at the translocation site, with its requirement dictated by the hydrophobicity and charged-region length of the signal sequence [PMID:8698819]. Photocrosslinking studies show that during integration of multi-spanning membrane proteins, each transmembrane segment first contacts Sec61α and then sequentially engages TRAM1 for an extended period, indicating that TRAM1 acts as a downstream acceptor for transmembrane domains exiting the translocon [PMID:17169373]."},"prefetch_data":{"uniprot":{"accession":"Q15629","full_name":"Translocating chain-associated membrane protein 1","aliases":[],"length_aa":374,"mass_kda":43.1,"function":"Involved in the translocation of nascent protein chains into or through the endoplasmic reticulum (ER) membrane by facilitating the proper chain positioning at the SEC61 channel (PubMed:12475939, PubMed:1315422, PubMed:32013668, PubMed:8616892, PubMed:9506517). Regulates the exposure of nascent secretory protein chain to the cytosol during translocation into the ER (PubMed:9506517). May affect the phospholipid bilayer in the vicinity of the lateral gate of the SEC61 channel, thereby facilitating ER protein transport (PubMed:32013668). Intimately associates with transmembrane (TM) domain of nascent membrane proteins during the entire integration process into the ER membrane (PubMed:8616892). Associates with the second TM domain of G-protein-coupled receptor opsin/OPSD nascent chain in the ER membrane, which may facilitate its integration into the membrane (PubMed:12475939). Under conditions of ER stress, participates in the disposal of misfolded ER membrane proteins during the unfolded protein response (UPR), an integrated stress response (ISR) pathway, by selectively retrotranslocating misfolded ER-membrane proteins from the ER into the cytosol where they are ubiquitinated and degraded by the proteasome (PubMed:20430023) (Microbial infection) In case of cytomegalovirus infection, participates in US2- and US11-mediated ER-to-cytosol retrotranslocation and subsequent degradation of major histocompatibility complex (MHC) class I heavy chains, thereby decreasing the immune detection by cytotoxic T-cells","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q15629/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAM1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCDC47","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRAM1","total_profiled":1310},"omim":[{"mim_id":"617505","title":"TRANSLOCATION-ASSOCIATED MEMBRANE PROTEIN 1-LIKE 1; TRAM1L1","url":"https://www.omim.org/entry/617505"},{"mim_id":"615335","title":"CERAMIDE SYNTHASE 5; CERS5","url":"https://www.omim.org/entry/615335"},{"mim_id":"615334","title":"CERAMIDE SYNTHASE 4; CERS4","url":"https://www.omim.org/entry/615334"},{"mim_id":"608485","title":"TRANSLOCATION-ASSOCIATED MEMBRANE PROTEIN 2; TRAM2","url":"https://www.omim.org/entry/608485"},{"mim_id":"605190","title":"TRANSLOCATION-ASSOCIATING MEMBRANE PROTEIN 1; TRAM1","url":"https://www.omim.org/entry/605190"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAM1"},"hgnc":{"alias_symbol":["TRAM","TRAMP"],"prev_symbol":[]},"alphafold":{"accession":"Q15629","domains":[{"cath_id":"-","chopping":"52-59_69-328","consensus_level":"medium","plddt":92.7152,"start":52,"end":328}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15629","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15629-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15629-F1-predicted_aligned_error_v6.png","plddt_mean":83.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAM1","jax_strain_url":"https://www.jax.org/strain/search?query=TRAM1"},"sequence":{"accession":"Q15629","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15629.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15629/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15629"}},"corpus_meta":[{"pmid":"18297073","id":"PMC_18297073","title":"TRAM couples endocytosis of 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/23403292","citation_count":307,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11050077","id":"PMC_11050077","title":"Synergistic enhancement of nuclear receptor function by p160 coactivators and two coactivators with protein methyltransferase activities.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11050077","citation_count":297,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10757795","id":"PMC_10757795","title":"The opposing transcriptional activities of the two isoforms of the human progesterone receptor are due to differential cofactor binding.","date":"2000","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10757795","citation_count":290,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49213,"output_tokens":4823,"usd":0.109992},"stage2":{"model":"claude-opus-4-6","input_tokens":8420,"output_tokens":3881,"usd":0.208687},"total_usd":0.576318,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":60994,"output_tokens":2364,"usd":0.109221},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":4734,"output_tokens":3011,"usd":0.148418}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"TRAM (TRIF-related adaptor molecule) is a TIR domain-containing adaptor protein that specifically bridges TLR4 to TRIF, activating IRF-3, IRF-7, and NF-κB-dependent signaling pathways in the MyD88-independent pathway; TRAM interacts with TRIF, Mal/TIRAP, and TLR4 but not TLR3, restricting its function to the TLR4 pathway.\",\n      \"method\": \"Dominant negative constructs, siRNA knockdown, co-immunoprecipitation, gene targeting (knockout mice)\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across two independent labs (PMID:14517278 and PMID:14556004) with genetic knockout and biochemical interaction data\",\n      \"pmids\": [\"14517278\", \"14556004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TLR4 sequentially activates TIRAP-MyD88 signaling at the plasma membrane and then undergoes endocytosis, after which TRAM-TRIF signaling is activated from early endosomes, coupling endocytosis to interferon-β induction.\",\n      \"method\": \"Live cell imaging, endocytosis inhibition assays, genetic knockouts, subcellular fractionation\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a highly-cited study establishing spatial-temporal mechanism\",\n      \"pmids\": [\"18297073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRAM recruits TRIF to the plasma membrane, and LPS stimulation upregulates TLR4 association with TRAM followed by their translocation into endosomes/lysosomes, where the internalized TLR4-TRAM complex colocalizes with TRAF3 downstream of TRIF.\",\n      \"method\": \"Immunofluorescence microscopy, co-immunoprecipitation, subcellular fractionation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab with multiple imaging and biochemical methods\",\n      \"pmids\": [\"18222170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A splice variant of TRAM called TAG (TRAM adaptor with GOLD domain) has a Golgi dynamics domain coupled to TRAM's TIR domain, localizes to late Rab7a-positive endosomes after LPS stimulation, inhibits IRF3 activation by displacing TRIF from TRAM, and negatively regulates the MyD88-independent TLR4 pathway.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, confocal microscopy, luciferase reporter assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing mechanism of a TRAM splice variant as a negative regulator\",\n      \"pmids\": [\"19412184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vascular endothelial cells express diminished levels of TRAM, restricting TLR4 signaling to the MyD88-dependent pathway; overexpression of TRAM in endothelial cells reconstitutes LPS-induced TRIF-dependent NF-κB activation and cxcl10 promoter activity.\",\n      \"method\": \"Gene expression analysis, TRAM cDNA overexpression, luciferase reporter assays, MyD88-knockout mice\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reconstitution by overexpression with reporter assays and genetic knockout controls\",\n      \"pmids\": [\"16574902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRAM TIR domain-derived decoy peptides (BB loop peptide TM4 and C helix peptide TM6) block coimmunoprecipitation of TRAM and TLR4, inhibit LPS-induced MyD88-dependent and TRIF-dependent cytokine production, and protect mice against lethal LPS challenge in vivo.\",\n      \"method\": \"Cell-permeating decoy peptides, co-immunoprecipitation, cytokine assays, in vivo LPS challenge model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — peptide interference with defined binding, confirmed in vivo\",\n      \"pmids\": [\"23345333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRAM contains a putative TRAF6-binding motif; TRAM directly interacts with TRAF6 via a key Glu183 residue, and mutation of this residue (TRAM E183A) significantly reduces LPS-induced TNF-α, IL-6, and RANTES production in macrophages, revealing a TRIF-independent signaling role for TRAM.\",\n      \"method\": \"Co-immunoprecipitation of endogenous and recombinant proteins, mutagenesis (E183A), confocal microscopy, luciferase reporter assays, macrophage reconstitution\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis combined with reciprocal co-IP and functional reconstitution in knockout macrophages\",\n      \"pmids\": [\"24812060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAM undergoes tyrosine phosphorylation upon TLR4 activation, which is required for TLR4-induced IRF3 activation; the phosphatase PTPN4 dephosphorylates TRAM, inhibiting TRAM-TRIF interaction and specifically suppressing TRIF-dependent IRF3 activation and IFN-β production.\",\n      \"method\": \"Tyrosine phosphorylation assays, co-immunoprecipitation, PTPN4 overexpression/knockdown, IFN-β reporter assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab with phosphorylation assays and functional interaction data\",\n      \"pmids\": [\"25825441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"By NMR structural analysis, TRAM (TICAM-2) interacts with TRIF (TICAM-1) via an acidic amino acid motif E87/D88/D89; TRAM's TIR domain couples with the TLR4 TIR dimer beneath the membrane; N-terminal myristoylation anchors TRAM to the endosomal membrane and residues D91/E92 cooperatively determine endosomal localization required for type I interferon induction.\",\n      \"method\": \"NMR structural analysis, mutagenesis, endosomal localization assays, IFN-β production assays\",\n      \"journal\": \"Biochemical Society transactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with mutagenesis; single lab\",\n      \"pmids\": [\"28630139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SLAMF1 interacts with TRAM via amino acids 68–95 of TRAM and 15 C-terminal amino acids of SLAMF1 (human-specific interaction), controls trafficking of TRAM from the endocytic recycling compartment to E. coli phagosomes in a Rab11-dependent manner, and is required for TLR4-mediated TRAM-TRIF-dependent IFN-β production.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, domain mapping, live-cell imaging, Rab11 knockdown, SLAMF1 knockout cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with domain mapping, genetic knockout, and live imaging with functional readout\",\n      \"pmids\": [\"29440514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRAM is involved in IL-18 signaling and acts as a sorting adaptor for MyD88 in this pathway; TRAM-TIR directly interacts with MyD88-TIR in vitro, and TRAM-deficient mice show impaired IL-18 signal transduction; MyD88 and TRAM co-localize at membrane regions in live cells.\",\n      \"method\": \"In vitro TIR domain binding assays, TRAM-deficient mice, RNAi, live cell imaging, cell-based assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout mice combined with in vitro binding and live imaging\",\n      \"pmids\": [\"22685567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Annexin A2 (AnxA2) facilitates TLR4 internalization and translocation to early endosomal membranes, activating TRAM-dependent endosomal signaling leading to anti-inflammatory cytokine release; AnxA2 deficiency prolongs TLR4 plasma membrane signaling and increases pro-inflammatory cytokine production.\",\n      \"method\": \"AnxA2-knockout mice, biochemical interaction assays, subcellular fractionation, cytokine measurements\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with mechanistic pathway placement\",\n      \"pmids\": [\"26527544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CD14/LPS but not TRAM is immobilized on Rab11A-positive endosomes; Rab11A localizes TRAM to the endocytic recycling compartment (ERC) and to early sorting endosomes; LPS induces TLR4 clustering with CD14/LPS and clathrin at the plasma membrane prior to endocytosis.\",\n      \"method\": \"TIRF microscopy, FRAP, RAB11A knockdown, live cell imaging in HEK293 and U373-CD14 cells\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — live imaging with multiple methods defining TRAM trafficking\",\n      \"pmids\": [\"25707286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRAM and TRIF also function downstream of TLR2 signaling; TLR2-mediated CCL5/RANTES induction is impaired in TRAM- or TRIF-deficient macrophages, and TRAM co-localizes with TLR2 in early endosomes, suggesting signaling from an intracellular compartment involving TBK-1 and IRF3.\",\n      \"method\": \"TRAM/TRIF-deficient macrophages, endocytosis inhibition, co-localization imaging, cytokine measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout macrophages with imaging and functional readout\",\n      \"pmids\": [\"25250521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM controls monocyte polarization through activating Src family kinase c-SRC, which induces STAT1/STAT5-regulated CCR2 and SIRP-α and suppresses PPARγ-regulated CD200R; TRAM deficiency enhances PPARγ and Pex5, facilitating peroxisome homeostasis and reducing ROS, generating a resolving monocyte phenotype; TRAM-deficient mice are resistant to atherosclerosis.\",\n      \"method\": \"TRAM-deficient mice, high-fat diet atherosclerosis model, monocyte transfer experiments, kinase activity assays, PPARγ/peroxisome pathway analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with in vivo disease model and mechanistic pathway identification\",\n      \"pmids\": [\"34499622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LPS-induced Th2 cytokine IL-4 production in macrophages requires both MyD88 and TRAM (but not TRAM alone), whereas TNF-α induction is MyD88-dependent only; siRNA silencing of TRAM abolished IL-4 but not TNF-α induction.\",\n      \"method\": \"siRNA knockdown, cytokine measurements, LPS stimulation of macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, siRNA only with cytokine readout\",\n      \"pmids\": [\"19638630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAM1 promotes microglia M1 polarization downstream of TLR4; TRAM1 overexpression increases M1 markers (IL-6, IL-1β, iNOS), and TRAM1 silencing inhibits LPS/IFN-γ-induced M1 gene expression; TRAM1 is essential for LPS/IFN-γ-induced IRAK1 expression, TBK1 and IRF3 phosphorylation, IκB phosphorylation, and nuclear translocation of NF-κB p65.\",\n      \"method\": \"Overexpression, siRNA knockdown, Western blotting, nuclear fractionation in BV2 and primary microglia cells\",\n      \"journal\": \"Journal of molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab with gain- and loss-of-function and multiple pathway markers\",\n      \"pmids\": [\"26563450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Clathrin/dynamin-dependent internalization of LPS is required for TRAM-TRIF-dependent signaling; inhibition of clathrin (MDC) or dynamin (dynasore) blocked TRAM-TRIF-mediated cytokine production and signaling molecule activation but did not affect colocalization of LPS and TLR4.\",\n      \"method\": \"Pharmacological inhibition of endocytosis (MDC, dynasore, chloroquine), protein array, macrophage stimulation\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple inhibitors with pathway-specific readouts\",\n      \"pmids\": [\"22341560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"TRAM1 (translocating chain-associating membrane protein) is required for cotranslational translocation of most, but not all, secretory proteins across the ER membrane in a signal sequence-dependent manner; TRAM is not needed for initial ribosome/nascent chain binding to the ER membrane but is required for insertion of the nascent chain into the translocation site in a protease-resistant manner; signal sequence features (length of charged N-terminal region and hydrophobic core structure) determine TRAM dependence.\",\n      \"method\": \"Reconstituted proteoliposomes, protease protection assay, hybrid protein experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in proteoliposomes with mutagenesis-like hybrid protein analysis\",\n      \"pmids\": [\"8698819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"During ER integration of a viral membrane protein, each transmembrane segment is sequentially adjacent first to Sec61α then to TRAM, as shown by photocrosslinking; TRAM crosslinking persists for extended periods during nascent chain biogenesis and does not depend solely on the specific TM domain sequence.\",\n      \"method\": \"Site-specific photocrosslinking, nascent chain analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro photocrosslinking reconstitution; single lab\",\n      \"pmids\": [\"17169373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRAM1 (ER translocon TRAM protein) has eight transmembrane segments including several poorly hydrophobic segments; TRAM is recognized by the signal recognition particle and translocon components during membrane integration; this topology was confirmed in mammalian cells expressing full-length TRAM.\",\n      \"method\": \"Photocrosslinking, truncated C-terminal reporter tag fusions, topology assays in mammalian cells\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — photocrosslinking and reporter fusion topology mapping with mammalian cell validation\",\n      \"pmids\": [\"21237175\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAM1 (also known as TICAM-2/TRAM) functions dually: as an eight-transmembrane ER-resident protein that facilitates signal sequence-dependent cotranslational translocation of nascent polypeptides across the ER membrane (acting downstream of Sec61α), and as a myristoylated TIR domain-containing sorting adaptor that bridges activated TLR4 to TRIF from endosomal compartments to induce IRF3-dependent type I interferon production, while also interacting with TRAF6, MyD88, TRAF3, and Rab11-dependent trafficking machinery, and being regulated by tyrosine phosphorylation (dephosphorylated by PTPN4) and by a negative-regulatory splice variant TAG.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nThe query gene is TRAM1 (human gene). Looking at the corpus, I identify multiple distinct genes sharing \"TRAM\" or related symbols:\n\n1. **TRAM1 (Translocating Chain-Associating Membrane protein 1)** - ER translocation protein. Papers: [11], [74], [85], [89]\n2. **TRAM (TRIF-related Adaptor Molecule / TICAM2)** - TLR4 adaptor in innate immunity. Papers: [1], [2], [3], [8], [15], [17], [20], [27], [29], [41], [51], [52], [68], [69], [72], [73], [77], [79], [84], [90], [91], [94], [100]\n3. **TRAMP (Transgenic Adenocarcinoma Mouse Prostate model)** - Not a gene. Papers: [4], [5], [6], [9], [10], [12], [14], [16], [19], [24], [25], [26], [30], [31], [43], [44], [45], [49], [50], [53], [57], [59], [62], [63], [64], [67], [70], [71], [75], [76], [81], [82], [83], [86], [93], [95], [96], [99]\n4. **TRAMP complex (yeast RNA surveillance)** - Papers: [13], [21], [22], [23], [32], [33], [34], [37], [38], [42], [55], [80], [97], [98]\n5. **TraM (bacterial conjugation protein)** - Papers: [18], [28], [47], [48], [60], [65], [66], [88], [92]\n6. **TRAM domain (tRNA modification)** - Paper: [35]\n7. **TRAM-34 (KCa3.1 channel blocker)** - Papers: [54], [78], [87]\n8. **TRAM-1 = SRC-3/AIB1** - Papers: [7], [58] and gene2pubmed papers [27], [3], [6], [1], [9], [15], [18], [25], [28], [29], [30]\n9. **WSL-1/TRAMP (DR3, death receptor)** - Paper: [56]\n10. **TRAMP (Tyrosine-rich acidic matrix protein)** - Paper: [46]\n11. **TRAM flap (surgical)** - Paper: [39]\n\n**TRAM1 canonical protein** = the ER translocon-associated membrane protein (translocating chain-associating membrane protein). Papers [11], [74], [85] clearly describe this. Paper [89] describes TRAM1 in microglia and mentions its role in TLR4 signaling as a sorting adaptor — this appears to conflate TRAM1 (ER protein) with TRAM (TICAM2). Reading carefully, [89] states \"TRAM1 is a protein involved in translocation of nascent polypeptides and functions as a sorting adaptor of TLR4\" — it appears to be studying the ER TRAM1 protein in a new context (microglia M1 polarization). KEEP [89].\n\nThe gene2pubmed papers are clearly about SRC-3/AIB1 (also called TRAM-1 as an alias of SRC-3). This is an ALIAS COLLISION — SRC-3 was named \"TRAM-1\" in one paper but the canonical TRAM1 gene is the ER translocon protein. Papers [27], [58] from the main corpus and the gene2pubmed papers describe SRC-3/AIB1. These should be EXCLUDED as alias collision (different gene).\n\nWait — I need to reconsider. HGNC TRAM1 could refer to SRC-3 coactivator (also known as TRAM-1). Let me check: The canonical TRAM1 (HGNC:12269) is indeed \"translocation associated membrane protein 1\" — the ER translocon protein. SRC-3/AIB1 was named TRAM-1 in one paper but its official HGNC symbol is NCOA3. So papers about TRAM-1 as SRC-3 coactivator = alias collision → EXCLUDE.\n\n**KEEP**: [11], [74], [85], [89]\n**EXCLUDE**: all others\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"TRAM1 (translocating chain-associating membrane protein) is required for cotranslational translocation of most, but not all, secretory proteins across the ER membrane in a signal sequence-dependent manner. Using reconstituted proteoliposomes, TRAM1 was shown to be dispensable for initial ribosome/nascent chain docking at the ER but essential for a subsequent step in which the nascent chain inserts into the translocation site in a protease-resistant manner. The structure of the signal sequence (length of the charged N-terminal region and hydrophobicity of the core) determines whether TRAM1 function is required.\",\n      \"method\": \"Reconstituted proteoliposomes with purified components; protease protection assay; hybrid signal sequence analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in defined proteoliposomes with multiple signal sequence variants and functional readout\",\n      \"pmids\": [\"8698819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"During co-translational integration of a viral double-spanning membrane protein into the ER, TRAM1 is sequentially adjacent to nascent transmembrane (TM) segments after their initial contact with Sec61α. Photocrosslinking experiments showed each TM segment first contacts Sec61α and subsequently contacts TRAM1, with TRAM1 crosslinking persisting for an extended period. Replacement of the first viral TM segment with a non-viral TM sequence still produced TRAM1 adducts, indicating that TRAM1 recognition does not depend solely on a specific TM sequence.\",\n      \"method\": \"Site-specific photocrosslinking during in vitro translation/integration; nascent chain adduct analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct photocrosslinking with multiple TM segment variants, rigorous sequential interaction mapping\",\n      \"pmids\": [\"17169373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRAM1 is a polytopic glycoprotein with eight transmembrane segments in the ER membrane, including several poorly hydrophobic segments. Its topology was established using photocrosslinking and truncated C-terminal reporter tag fusions, and the protein is recognized by the signal recognition particle and translocon components during its own membrane insertion. The proposed eight-TM topology was confirmed in mammalian cells expressing full-length TRAM1.\",\n      \"method\": \"Photocrosslinking; C-terminal reporter tag fusions (glycosylation and protease accessibility); full-length mammalian cell expression validation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — two orthogonal structural/topological methods with in-cell validation\",\n      \"pmids\": [\"21237175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAM1 promotes microglia M1 polarization. TRAM1 expression is strongly induced in LPS/IFN-γ-stimulated BV2 and primary microglia cells. Overexpression of TRAM1 significantly enhanced M1 polarization markers (IL-6, IL-1β, iNOS), while siRNA-mediated knockdown inhibited LPS/IFN-γ-induced M1 gene expression. TRAM1 was found to cooperate with TLR4 signaling, and is required for LPS/IFN-γ-induced activation of IRAK1, phosphorylation of TBK1 and IRF3, phosphorylation of IκB and p65, and nuclear translocation of NF-κB p65.\",\n      \"method\": \"Overexpression (Flag-TRAM1 transfection); siRNA knockdown; western blotting for signaling intermediates; immunofluorescence for NF-κB nuclear translocation; BV2 and primary microglia cell models\",\n      \"journal\": \"Journal of molecular neuroscience : MN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD/OE with defined phenotype and pathway markers; single lab, single study\",\n      \"pmids\": [\"26563450\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAM1 (translocating chain-associating membrane protein 1) is an eight-transmembrane ER glycoprotein that acts downstream of Sec61α in the co-translational translocation/integration pathway, facilitating insertion of nascent secretory and membrane proteins into the ER in a signal sequence-dependent manner, and additionally has been shown to promote TLR4-mediated NF-κB and IRF3 signaling and M1 microglia polarization.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRAM1 has two experimentally characterized identities in the literature: an ER-resident eight-transmembrane protein that facilitates signal sequence-dependent cotranslational translocation of nascent polypeptides across the ER membrane downstream of Sec61α, and a TIR domain-containing sorting adaptor in innate immune signaling. As an ER translocon component, TRAM1 is not required for initial ribosome/nascent chain binding but is essential for insertion of the nascent chain into the translocation site, with dependence governed by the signal sequence's hydrophobic core and charged N-terminal region [PMID:8698819, PMID:17169373]. As an innate immune adaptor (also called TICAM-2), TRAM bridges activated TLR4 to TRIF from endosomal compartments following clathrin/dynamin-dependent receptor internalization, inducing IRF3-dependent type I interferon production; its endosomal localization depends on N-terminal myristoylation, Rab11-dependent trafficking from the endocytic recycling compartment, and interaction with SLAMF1, while it also directly engages TRAF6 via Glu183 for TRIF-independent cytokine signaling and is negatively regulated by the splice variant TAG and by PTPN4-mediated tyrosine dephosphorylation [PMID:14517278, PMID:18297073, PMID:24812060, PMID:19412184, PMID:29440514, PMID:25825441]. TRAM deficiency in mice confers resistance to atherosclerosis by promoting a resolving monocyte phenotype through enhanced PPARγ and peroxisome homeostasis [PMID:34499622].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that TRAM1 is a signal-sequence-selective component of the ER translocation machinery resolved how certain secretory proteins require an accessory factor beyond Sec61 for productive membrane insertion.\",\n      \"evidence\": \"Reconstituted proteoliposomes with protease protection and hybrid signal sequence experiments\",\n      \"pmids\": [\"8698819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of TRAM1 in the translocon complex\",\n        \"Mechanism by which signal sequence features dictate TRAM dependence unresolved at atomic level\",\n        \"Relationship between TRAM1's translocon role and any immune adaptor function not addressed\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of TRAM as a TIR domain-containing adaptor bridging TLR4 to TRIF established the molecular basis for the MyD88-independent/TRIF-dependent pathway and explained TLR4-specific interferon induction.\",\n      \"evidence\": \"Dominant-negative constructs, siRNA, co-immunoprecipitation, and TRAM-knockout mice from two independent laboratories\",\n      \"pmids\": [\"14517278\", \"14556004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of TIR-TIR interaction between TRAM and TLR4/TRIF unknown at this stage\",\n        \"Subcellular compartment from which TRAM signals not yet defined\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstration that vascular endothelial cells lack TRAM expression, restricting TLR4 to MyD88-only signaling, established TRAM as a cell-type-specific gatekeeper of innate immune pathway selection.\",\n      \"evidence\": \"Gene expression analysis, TRAM cDNA reconstitution with reporter assays, MyD88-knockout mice\",\n      \"pmids\": [\"16574902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Transcriptional regulation of TRAM expression across cell types not defined\",\n        \"Whether TRAM expression level alone is sufficient to explain pathway bias not fully tested\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Photocrosslinking showed that during ER integration of a multi-spanning membrane protein, each transmembrane segment sequentially contacts Sec61α then TRAM, defining TRAM's position in the translocon's lateral gate exit pathway.\",\n      \"evidence\": \"Site-specific photocrosslinking of nascent viral membrane protein chains\",\n      \"pmids\": [\"17169373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No high-resolution structure of TRAM within the translocon\",\n        \"Functional consequence of prolonged TRAM crosslinking not determined\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing that TLR4 signals through TIRAP-MyD88 at the plasma membrane and switches to TRAM-TRIF after clathrin/dynamin-dependent endocytosis resolved the spatial-temporal logic of bifurcated TLR4 signaling.\",\n      \"evidence\": \"Live cell imaging, endocytosis inhibition, genetic knockouts, subcellular fractionation; confirmed by independent immunofluorescence and co-IP studies\",\n      \"pmids\": [\"18297073\", \"18222170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism triggering the switch from plasma membrane to endosomal signaling not fully defined\",\n        \"Role of specific Rab GTPases in TRAM trafficking not yet characterized\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery of TAG, a TRAM splice variant containing a GOLD domain that displaces TRIF and localizes to Rab7a-positive late endosomes, revealed an endogenous negative feedback mechanism limiting TRAM-TRIF-dependent interferon signaling.\",\n      \"evidence\": \"siRNA, co-immunoprecipitation, confocal microscopy, luciferase reporter assays\",\n      \"pmids\": [\"19412184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Regulation of TAG/TRAM splicing ratio not defined\",\n        \"Whether TAG competes directly at the same TIR interface or acts allosterically unresolved\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Topology mapping established that ER translocon TRAM1 has eight transmembrane segments including poorly hydrophobic ones, clarifying its complex membrane architecture.\",\n      \"evidence\": \"Photocrosslinking, C-terminal reporter tag truncations, and topology assays in mammalian cells\",\n      \"pmids\": [\"21237175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"High-resolution structure of full-length TRAM1 not available\",\n        \"Whether all eight TM segments are required for translocation function not tested\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extension of TRAM's adaptor role to IL-18 signaling, where it sorts MyD88 to membrane compartments, broadened TRAM's function beyond TLR4-TRIF to include MyD88-dependent pathways of other receptors.\",\n      \"evidence\": \"In vitro TIR domain binding, TRAM-deficient mice, live cell imaging\",\n      \"pmids\": [\"22685567\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"IL-18R-TRAM interaction not confirmed by reciprocal endogenous co-IP\",\n        \"Whether TRAM functions as a sorting adaptor for other IL-1R family members not tested\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of a TRAF6-binding motif in TRAM (critical Glu183) demonstrated a TRIF-independent signaling output, expanding TRAM's function beyond a passive bridge to an active signaling scaffold.\",\n      \"evidence\": \"Reciprocal co-IP of endogenous and recombinant proteins, E183A mutagenesis, macrophage reconstitution\",\n      \"pmids\": [\"24812060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of TRAM-TRAF6 interaction not resolved\",\n        \"Whether TRAM-TRAF6 signaling operates independently of endosomal localization not tested\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstration that TRAM-TRIF also functions downstream of TLR2 for CCL5 induction from endosomes extended the TRAM-TRIF axis beyond TLR4, challenging the earlier model of strict TLR4 specificity.\",\n      \"evidence\": \"TRAM/TRIF-deficient macrophages, endocytosis inhibition, co-localization imaging\",\n      \"pmids\": [\"25250521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between TLR2 and TRAM not demonstrated by co-IP\",\n        \"Whether other TLRs also engage TRAM not systematically tested\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Rab11A was shown to localize TRAM to the endocytic recycling compartment and early sorting endosomes, while tyrosine phosphorylation of TRAM (reversed by PTPN4) was shown to regulate TRAM-TRIF interaction and IFN-β output, defining two distinct regulatory layers controlling TRAM activity.\",\n      \"evidence\": \"TIRF microscopy, FRAP, Rab11A knockdown; phosphorylation assays, PTPN4 overexpression/knockdown, IFN-β reporters\",\n      \"pmids\": [\"25707286\", \"25825441\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific tyrosine residue(s) phosphorylated on TRAM not identified\",\n        \"Kinase responsible for TRAM tyrosine phosphorylation not identified\",\n        \"Whether Rab11-dependent trafficking and phosphorylation are coordinated not addressed\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"NMR structural analysis of TRAM's TIR domain revealed the TRIF-interacting acidic motif (E87/D88/D89) and showed that N-terminal myristoylation combined with D91/E92 cooperatively determines endosomal membrane anchoring, providing the first atomic-level view of how TRAM couples membrane targeting to adaptor function.\",\n      \"evidence\": \"NMR structural analysis, mutagenesis, endosomal localization and IFN-β production assays\",\n      \"pmids\": [\"28630139\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Full-length TRAM structure including non-TIR regions not available\",\n        \"Structure of the ternary TLR4-TRAM-TRIF complex not determined\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"SLAMF1 was identified as a human-specific TRAM interaction partner that controls Rab11-dependent trafficking of TRAM from the endocytic recycling compartment to E. coli phagosomes, linking adaptive-like receptor function to innate TRAM-TRIF signaling.\",\n      \"evidence\": \"Endogenous reciprocal co-IP, domain mapping, live-cell imaging, Rab11 knockdown, SLAMF1-knockout cells\",\n      \"pmids\": [\"29440514\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SLAMF1-TRAM interaction is relevant beyond bacterial phagosomes not tested\",\n        \"Structural basis of the SLAMF1-TRAM interface not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In vivo studies in TRAM-deficient mice revealed that TRAM controls monocyte inflammatory polarization through c-SRC/STAT1/STAT5 signaling and suppression of PPARγ-dependent peroxisome homeostasis, connecting TRAM to atherosclerosis pathogenesis.\",\n      \"evidence\": \"TRAM-knockout mice on high-fat diet, monocyte transfer, kinase activity assays, PPARγ/Pex5 pathway analysis\",\n      \"pmids\": [\"34499622\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TRAM-c-SRC interaction is direct not determined\",\n        \"Relevance to human atherosclerosis not established\",\n        \"Whether translocon TRAM1 and immune adaptor TRAM share any functional overlap in monocytes not addressed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The relationship between TRAM1's ER translocon function (eight-TM protein facilitating cotranslational translocation) and the TIR domain-containing immune adaptor TRAM (TICAM-2) remains molecularly unresolved — whether these represent the same gene product in different contexts or reflect nomenclature overlap is a fundamental open question, and a full-length high-resolution structure of TRAM in either the translocon or the TLR4 signaling complex is lacking.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of TRAM in either the Sec61 translocon or TLR4 signaling complex\",\n        \"Functional relationship between ER translocon TRAM1 and innate immune adaptor TRAM not defined\",\n        \"Identity of the kinase that phosphorylates TRAM tyrosine residues unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2, 6, 10]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [18, 19, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [18, 19, 20]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 2, 9, 12, 13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 8, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 3, 5, 6, 7, 9, 13, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 6, 7, 14]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [18, 19, 20]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [18, 19]}\n    ],\n    \"complexes\": [\n      \"TLR4-TRAM-TRIF signalosome\",\n      \"Sec61 translocon\"\n    ],\n    \"partners\": [\n      \"TRIF\",\n      \"TLR4\",\n      \"TRAF6\",\n      \"SLAMF1\",\n      \"TRAF3\",\n      \"MYD88\",\n      \"PTPN4\",\n      \"SEC61A1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TRAM1 is an eight-transmembrane ER glycoprotein that functions downstream of Sec61α in the co-translational translocation pathway, facilitating the insertion of nascent secretory and membrane protein chains into the ER membrane in a signal sequence–dependent manner [PMID:8698819]. In reconstituted proteoliposomes, TRAM1 is dispensable for initial ribosome–nascent chain docking but essential for the subsequent step in which the nascent chain achieves protease-resistant insertion at the translocation site, with its requirement dictated by the hydrophobicity and charged-region length of the signal sequence [PMID:8698819]. Photocrosslinking studies show that during integration of multi-spanning membrane proteins, each transmembrane segment first contacts Sec61α and then sequentially engages TRAM1 for an extended period, indicating that TRAM1 acts as a downstream acceptor for transmembrane domains exiting the translocon [PMID:17169373].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Resolved whether TRAM1 participates in ribosome docking or a later translocation step: TRAM1 is dispensable for SRP-mediated targeting but essential for subsequent signal sequence–dependent nascent chain insertion, establishing it as a translocation-competence factor rather than a targeting factor.\",\n      \"evidence\": \"Reconstituted proteoliposomes with purified SRP, SR, Sec61, and TRAM1; protease protection assay with hybrid signal sequences\",\n      \"pmids\": [\"8698819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which signal sequence features determine TRAM1 dependence is unknown\",\n        \"No structural information on TRAM1–nascent chain contacts\",\n        \"Role in membrane protein (versus secretory protein) integration not yet examined\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the sequential order of translocon contacts during multi-spanning membrane protein integration: each transmembrane segment first contacts Sec61α and then transfers to TRAM1, positioning TRAM1 as a downstream acceptor that holds TM segments after their exit from the Sec61 channel.\",\n      \"evidence\": \"Site-specific photocrosslinking during in vitro translation of a double-spanning viral membrane protein with TM segment variants\",\n      \"pmids\": [\"17169373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TRAM1 directly facilitates lateral release of TM segments into the lipid bilayer is untested\",\n        \"Stoichiometry and dynamics of TRAM1–Sec61 interaction during integration remain uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the membrane topology of TRAM1 itself as an eight-transmembrane glycoprotein containing several poorly hydrophobic TM segments, providing the first structural framework for understanding how it engages nascent chains.\",\n      \"evidence\": \"Photocrosslinking and C-terminal glycosylation/protease-accessibility reporter fusions validated in mammalian cells\",\n      \"pmids\": [\"21237175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of TRAM1 or TRAM1–translocon complex\",\n        \"Which of the eight TM segments form the nascent chain contact surface is unknown\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified a non-canonical role for TRAM1 in innate immune signaling: TRAM1 is induced by LPS/IFN-γ in microglia and is required for TLR4-mediated activation of NF-κB and IRF3, promoting M1 polarization.\",\n      \"evidence\": \"siRNA knockdown and overexpression in BV2 and primary microglia; western blot for IRAK1, p-TBK1, p-IRF3, p-IκB, p-p65; immunofluorescence for NF-κB nuclear translocation\",\n      \"pmids\": [\"26563450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding not independently replicated\",\n        \"Whether the TLR4 signaling role depends on TRAM1's translocation function or is mechanistically distinct is unresolved\",\n        \"Physical interaction between TRAM1 and TLR4 pathway components not demonstrated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of TRAM1 in the context of the Sec61 translocon is needed to explain how signal sequence features and TM segment properties determine TRAM1 dependence, and whether its reported immune signaling function is mechanistically linked to its translocation role.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No cryo-EM or crystal structure of TRAM1 alone or in complex\",\n        \"In vivo loss-of-function phenotype in mammalian models not reported\",\n        \"Mechanism coupling TRAM1 to TLR4 pathway activation remains undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009609507\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SEC61A1\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway term_id. Let me correct that — \"GO:0009609507\" is not valid. The correct Reactome term for protein localization is \"R-HSA-9609507\".\n\n```json\n{\n  \"mechanistic_narrative\": \"TRAM1 is an eight-transmembrane ER glycoprotein that functions downstream of Sec61α in the co-translational translocation pathway, facilitating the insertion of nascent secretory and membrane protein chains into the ER membrane in a signal sequence–dependent manner [PMID:8698819]. In reconstituted proteoliposomes, TRAM1 is dispensable for initial ribosome–nascent chain docking but essential for the subsequent step in which the nascent chain achieves protease-resistant insertion at the translocation site, with its requirement dictated by the hydrophobicity and charged-region length of the signal sequence [PMID:8698819]. Photocrosslinking studies show that during integration of multi-spanning membrane proteins, each transmembrane segment first contacts Sec61α and then sequentially engages TRAM1 for an extended period, indicating that TRAM1 acts as a downstream acceptor for transmembrane domains exiting the translocon [PMID:17169373].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Resolved whether TRAM1 participates in ribosome docking or a later translocation step: TRAM1 is dispensable for SRP-mediated targeting but essential for subsequent signal sequence–dependent nascent chain insertion, establishing it as a translocation-competence factor rather than a targeting factor.\",\n      \"evidence\": \"Reconstituted proteoliposomes with purified SRP, SR, Sec61, and TRAM1; protease protection assay with hybrid signal sequences\",\n      \"pmids\": [\"8698819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which signal sequence features determine TRAM1 dependence is unknown\",\n        \"No structural information on TRAM1–nascent chain contacts\",\n        \"Role in membrane protein (versus secretory protein) integration not yet examined\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the sequential order of translocon contacts during multi-spanning membrane protein integration: each transmembrane segment first contacts Sec61α and then transfers to TRAM1, positioning TRAM1 as a downstream acceptor that holds TM segments after their exit from the Sec61 channel.\",\n      \"evidence\": \"Site-specific photocrosslinking during in vitro translation of a double-spanning viral membrane protein with TM segment variants\",\n      \"pmids\": [\"17169373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TRAM1 directly facilitates lateral release of TM segments into the lipid bilayer is untested\",\n        \"Stoichiometry and dynamics of TRAM1–Sec61 interaction during integration remain uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the membrane topology of TRAM1 itself as an eight-transmembrane glycoprotein containing several poorly hydrophobic TM segments, providing the first structural framework for understanding how it engages nascent chains.\",\n      \"evidence\": \"Photocrosslinking and C-terminal glycosylation/protease-accessibility reporter fusions validated in mammalian cells\",\n      \"pmids\": [\"21237175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of TRAM1 or TRAM1–translocon complex\",\n        \"Which of the eight TM segments form the nascent chain contact surface is unknown\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified a non-canonical role for TRAM1 in innate immune signaling: TRAM1 is induced by LPS/IFN-γ in microglia and is required for TLR4-mediated activation of NF-κB and IRF3, promoting M1 polarization.\",\n      \"evidence\": \"siRNA knockdown and overexpression in BV2 and primary microglia; western blot for IRAK1, p-TBK1, p-IRF3, p-IκB, p-p65; immunofluorescence for NF-κB nuclear translocation\",\n      \"pmids\": [\"26563450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding not independently replicated\",\n        \"Whether the TLR4 signaling role depends on TRAM1's translocation function or is mechanistically distinct is unresolved\",\n        \"Physical interaction between TRAM1 and TLR4 pathway components not demonstrated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of TRAM1 in the context of the Sec61 translocon is needed to explain how signal sequence features and TM segment properties determine TRAM1 dependence, and whether its reported immune signaling function is mechanistically linked to its translocation role.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No cryo-EM or crystal structure of TRAM1 alone or in complex\",\n        \"In vivo loss-of-function phenotype in mammalian models not reported\",\n        \"Mechanism coupling TRAM1 to TLR4 pathway activation remains undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SEC61A1\"],\n    \"other_free_text\": []\n  }\n}\n```"}