{"gene":"TRAM2","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2004,"finding":"TRAM2 protein interacts with the ER Ca2+ pump SERCA2b via its C-terminal domain, as demonstrated by yeast two-hybrid screen and co-immunoprecipitation in human cells. Deletion of the C-terminal part of TRAM2 inhibits type I collagen synthesis during hepatic stellate cell activation. TRAM2 also co-precipitates with anti-collagen antibody, suggesting direct interaction. The pharmacological SERCA2b inhibitor thapsigargin phenocopies TRAM2 C-terminal deletion, inhibiting triple-helical collagen folding and increasing intracellular degradation.","method":"Yeast two-hybrid screen, co-immunoprecipitation, deletion mutagenesis, pharmacological inhibition (thapsigargin), hepatic stellate cell activation model","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (Y2H, co-IP, mutagenesis, pharmacological) in a single rigorous study establishing interaction and functional consequence","pmids":["14749390"],"is_preprint":false},{"year":2016,"finding":"TRAM2 is required for translocation of the N-terminus of the first transmembrane helix of TM4SF20 into the ER lumen. In the absence of ceramide, TRAM2 facilitates this translocation; in the presence of ceramide, TM4SF20 translocation becomes TRAM2-independent and its membrane topology is inverted (regulated alternative translocation, RAT), leading to stimulation of CREB3L1 cleavage.","method":"Genetic knockdown/overexpression, topology assays, ceramide treatment, functional readout of CREB3L1 proteolytic processing","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic epistasis with defined substrate (TM4SF20), topology assays, and functional output; replicated across conditions in single rigorous study","pmids":["27499293"],"is_preprint":false},{"year":2021,"finding":"TRAM2 directly interacts with ceramide: using a photoactivatable and clickable short-chain ceramide analog (pac-C7-Cer), TRAM2 (and its homolog TRAM1) were identified as ceramide-binding proteins. This binding was competed by naturally occurring long-chain ceramides, and ceramide binding to TRAM2 correlated with the ability to induce regulated alternative translocation (RAT) of TM4SF20.","method":"Photoactivatable ceramide analog (pac-C7-Cer) crosslinking, click chemistry pulldown, competition assay with long-chain ceramides, functional RAT assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct biochemical crosslinking with competition controls plus functional validation of ceramide-binding relevance; multiple orthogonal methods","pmids":["34793833"],"is_preprint":false},{"year":2021,"finding":"TRAM2 directly interacts with SERCA2b and modulates SERCA2b activity to couple calcium enrichment with collagen biosynthesis in osteoblasts. Silencing TRAM2 disrupts the relationship between calcium concentration and collagen production, causing poor mineralization.","method":"Co-immunoprecipitation, TRAM2 silencing (siRNA/shRNA), biomineralization assay in osteoblasts","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and loss-of-function with defined phenotype in osteoblasts, single lab, replicates the SERCA2b interaction found in PMID:14749390","pmids":["34047068"],"is_preprint":false},{"year":2007,"finding":"Tram2 is a direct transcriptional target of the osteoblast master regulator Runx2, identified by ChIP Display in MC3T3-E1 osteoblastic cells. Runx2 occupies a genomic region within the Tram2 locus. BMP-2 treatment relieves Runx2-mediated suppression of Tram2 in non-osteoblasts and coincides with increased Tram2 mRNA in multiple cell lines, placing Tram2 downstream of BMP/Runx2 signaling in osteoblast function.","method":"Chromatin immunoprecipitation (ChIP Display), mRNA expression analysis, BMP-2 treatment, Runx2 overexpression in multiple cell lines","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes direct Runx2 occupancy; functional mRNA regulation validated across multiple cell lines; single lab","pmids":["17486635"],"is_preprint":false},{"year":2018,"finding":"Knockdown of TRAM2 in oral squamous cell carcinoma (OSCC) cells inhibits cell migration, invasiveness, and transendothelial migration, accompanied by significant decreases in PERK and matrix metalloproteinases MT1-MMP, MMP2, and MMP9, placing TRAM2 upstream of PERK and MMP activation in OSCC metastatic behavior.","method":"siRNA knockdown, migration/invasion/transendothelial migration assays, Western blotting for PERK and MMPs","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular pathway readouts (PERK, MMPs); single lab, multiple phenotypic assays","pmids":["30271493"],"is_preprint":false},{"year":2021,"finding":"TRAM2 is a transcriptional target of the YAP/TEAD4 enhancer axis. Genetic deletion of EnhancerTRAM2 reduces TRAM2 expression and phenocopies YAP loss-of-function in proliferation, migration, and invasion. FSTL-1 is identified as a major direct client (secreted factor) of TRAM2 involved in these oncogenic phenotypes.","method":"Genome-wide ChIP profiling (YAP/TEAD4), CRISPR-mediated enhancer deletion, proliferation/migration/invasion assays, identification of FSTL-1 as TRAM2 client","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR enhancer deletion with functional epistasis and downstream client identification; single lab, multiple orthogonal approaches","pmids":["33514403"],"is_preprint":false},{"year":2021,"finding":"TRAM2 silencing significantly reduces intracellular bacterial load of Staphylococcus aureus while restoring host cell viability. Treatment with the SERCA inhibitor thapsigargin (which targets the TRAM2-SERCA interaction) also halted intracellular MRSA survival, indicating TRAM2's role in supporting intracellular bacterial infection via its interaction with SERCA pumps.","method":"shRNA screen (genome-wide), TRAM2 silencing validation, thapsigargin treatment, intracellular bacterial load quantification","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA screen followed by functional validation with pharmacological confirmation; single lab","pmids":["31659191"],"is_preprint":false},{"year":2022,"finding":"RBM15B, transcriptionally activated by YY1, regulates TRAM2 mRNA stability in an m6A-dependent manner in hepatocellular carcinoma cells, establishing a YY1-RBM15B-TRAM2 regulatory axis.","method":"m6A modification assay, RBM15B overexpression/knockdown, mRNA stability assay, luciferase and ChIP assays for YY1 binding","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A-dependent mRNA stability mechanism validated with multiple molecular approaches; single lab","pmids":["35494016"],"is_preprint":false},{"year":2021,"finding":"miR-432-5p, secreted in exosomes from iPSC-MSCs, suppresses TRAM2 expression in corneal stromal stem cells, reducing collagen biosynthesis and ECM deposition (downregulating COL1A1, COL5A1, COL5A2 mRNA), and promoting corneal stroma regeneration.","method":"miRNA mimic/inhibitor transfection, luciferase reporter assay (implied by direct repression claim), mRNA expression analysis, in vivo corneal model","journal":"Biomaterials","confidence":"Low","confidence_rationale":"Tier 3 / Weak — miRNA-target relationship asserted with 'most probably linked to direct repression'; abstract does not explicitly describe luciferase validation; single lab","pmids":["34923312"],"is_preprint":false},{"year":2021,"finding":"TRAM2 knockdown suppresses glioma cell proliferation, invasion, migration, and EMT in vitro and inhibits tumorigenicity in vivo. TRAM2 is positively associated with PI3K/AKT/mTOR signaling activation, and the PI3K activator 740Y-P reverses the effects of TRAM2 silencing, placing TRAM2 upstream of PI3K/AKT/mTOR in glioma.","method":"siRNA knockdown, PI3K pathway inhibition/activation (740Y-P), proliferation/invasion/migration assays, xenograft model","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — epistasis via single pharmacological rescue experiment; pathway placement indirect; single lab","pmids":["34826698"],"is_preprint":false}],"current_model":"TRAM2 is a translocon-associated ER membrane protein that physically interacts with the Ca2+ pump SERCA2b via its C-terminal domain to locally elevate Ca2+ concentration at the site of collagen synthesis, thereby facilitating cotranslational folding and biosynthesis of type I collagen; TRAM2 also functions as a ceramide-binding protein that mediates regulated alternative translocation (RAT) of TM4SF20 — promoting ER-luminal insertion of TM4SF20's first transmembrane helix in the absence of ceramide, while ceramide binding releases this requirement and inverts TM4SF20 topology to activate CREB3L1 cleavage; transcriptionally, TRAM2 is regulated downstream of BMP/Runx2 signaling in osteoblasts and the YAP/TEAD4 enhancer axis in cancer, and its expression is post-transcriptionally controlled by m6A modification via RBM15B."},"narrative":{"mechanistic_narrative":"TRAM2 is a translocon-associated endoplasmic reticulum membrane protein that couples local Ca2+ provision to collagen biosynthesis and governs the topology of select substrate proteins during their cotranslational insertion into the ER. Through its C-terminal domain, TRAM2 binds and modulates the ER Ca2+ pump SERCA2b to locally enrich Ca2+ at the site of collagen synthesis, a function required for proper triple-helical folding of type I collagen; loss of the C-terminus or pharmacological SERCA inhibition with thapsigargin blocks collagen folding and increases its intracellular degradation [PMID:14749390], and in osteoblasts this SERCA2b coupling links Ca2+ to collagen production and biomineralization [PMID:34047068]. In parallel, TRAM2 acts as a ceramide-binding protein that mediates regulated alternative translocation (RAT): it normally promotes ER-luminal translocation of the first transmembrane helix of TM4SF20, whereas ceramide binding releases this requirement and inverts TM4SF20 topology to activate CREB3L1 cleavage [PMID:27499293, PMID:34793833]. Transcriptionally, TRAM2 lies downstream of BMP/Runx2 signaling in osteoblasts, where Runx2 directly occupies the Tram2 locus and BMP-2 relieves its repression [PMID:17486635], and downstream of a YAP/TEAD4 enhancer axis in cancer, where it supports proliferation, migration, and invasion in part through the secreted client FSTL-1 [PMID:33514403].","teleology":[{"year":2004,"claim":"Established the founding mechanistic role of TRAM2 by showing it physically couples the ER Ca2+ pump to collagen biosynthesis, explaining how an ER membrane protein enables proper triple-helical collagen folding.","evidence":"Yeast two-hybrid, co-immunoprecipitation, C-terminal deletion mutagenesis, and thapsigargin inhibition in a hepatic stellate cell activation model","pmids":["14749390"],"confidence":"High","gaps":["Direct measurement of local Ca2+ elevation at the translocon not shown","Whether collagen contacts TRAM2 directly versus via SERCA2b/Ca2+ not resolved","Structural basis of the C-terminal SERCA2b interaction unknown"]},{"year":2007,"claim":"Placed TRAM2 transcriptionally within osteoblast differentiation by identifying it as a direct Runx2 target relieved by BMP-2, connecting its collagen-supporting function to a known bone master-regulator pathway.","evidence":"ChIP Display, Runx2 overexpression, and BMP-2 treatment with mRNA analysis across multiple cell lines","pmids":["17486635"],"confidence":"Medium","gaps":["Functional consequence of Runx2 occupancy on bone phenotype not tested","Direct regulatory element within the locus not finely mapped","Single lab"]},{"year":2016,"claim":"Revealed a second, topology-determining function: TRAM2 is required for ER-luminal translocation of a substrate transmembrane helix and is bypassed by ceramide to drive regulated alternative translocation and CREB3L1 activation.","evidence":"Knockdown/overexpression with topology assays and CREB3L1 cleavage readout under ceramide treatment","pmids":["27499293"],"confidence":"High","gaps":["How ceramide alters TRAM2-substrate engagement mechanistically not defined","Breadth of substrates beyond TM4SF20 unknown","Link between RAT function and collagen/SERCA2b function unexplored"]},{"year":2021,"claim":"Defined the molecular basis of ceramide regulation by demonstrating TRAM2 directly binds ceramide, with binding correlating to its ability to trigger RAT.","evidence":"Photoactivatable clickable ceramide analog crosslinking, click-chemistry pulldown, long-chain ceramide competition, and functional RAT assay","pmids":["34793833"],"confidence":"High","gaps":["Ceramide-binding site on TRAM2 not mapped","Stoichiometry and structural change upon binding unknown","Whether ceramide binding affects the SERCA2b/collagen function not tested"]},{"year":2021,"claim":"Extended the SERCA2b coupling model to bone by showing TRAM2 modulates SERCA2b activity to link Ca2+ enrichment with collagen production and mineralization.","evidence":"Co-immunoprecipitation, TRAM2 silencing, and biomineralization assays in osteoblasts","pmids":["34047068"],"confidence":"Medium","gaps":["Quantitative effect on SERCA2b pump kinetics not measured","Single lab","In vivo bone phenotype not established"]},{"year":2021,"claim":"Connected TRAM2 to oncogenic transcriptional control by identifying it as a YAP/TEAD4 enhancer target whose loss phenocopies YAP loss and whose function involves the secreted client FSTL-1.","evidence":"Genome-wide YAP/TEAD4 ChIP, CRISPR enhancer deletion with proliferation/migration/invasion assays, and FSTL-1 client identification","pmids":["33514403"],"confidence":"Medium","gaps":["Mechanism by which TRAM2 handles FSTL-1 as a client not defined","Whether collagen/Ca2+ function underlies the oncogenic phenotype unclear","Single lab"]},{"year":2021,"claim":"Implicated TRAM2-SERCA function in host support of intracellular bacterial infection, broadening the physiological relevance of the SERCA interaction.","evidence":"Genome-wide shRNA screen with silencing validation and thapsigargin treatment measuring intracellular MRSA load","pmids":["31659191"],"confidence":"Medium","gaps":["Direct molecular link between TRAM2-SERCA Ca2+ and bacterial survival not dissected","Whether collagen pathway is involved unknown","Single lab"]},{"year":2022,"claim":"Added post-transcriptional control by establishing a YY1-RBM15B axis that stabilizes TRAM2 mRNA via m6A modification in hepatocellular carcinoma.","evidence":"m6A assays, RBM15B overexpression/knockdown, mRNA stability assays, and luciferase/ChIP for YY1 binding","pmids":["35494016"],"confidence":"Medium","gaps":["Specific m6A sites on TRAM2 transcript not mapped","Downstream functional output of stabilized TRAM2 not detailed","Single lab"]},{"year":2021,"claim":"Associated TRAM2 with additional cancer and ECM-regulatory contexts, suggesting broader roles in collagen/ECM output and tumor signaling.","evidence":"miRNA mimic/inhibitor and corneal model (miR-432-5p); siRNA with PI3K activator rescue and xenograft (glioma)","pmids":["34923312","34826698"],"confidence":"Low","gaps":["Direct miRNA-target repression not confirmed by luciferase in the corneal study","PI3K/AKT/mTOR placement rests on single pharmacological rescue","Mechanistic link to core TRAM2 ER functions not established"]},{"year":null,"claim":"How TRAM2's two molecular functions — SERCA2b/Ca2+-coupled collagen folding and ceramide-gated substrate translocation — are integrated within a single translocon-associated protein, and whether they share structural determinants, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of TRAM2","Ceramide-binding and SERCA2b-binding interfaces not jointly mapped","Unclear whether oncogenic phenotypes derive from collagen function, RAT function, or both"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,3]}],"complexes":[],"partners":["ATP2A2","TM4SF20","COL1A1","FSTL1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15035","full_name":"Translocating chain-associated membrane protein 2","aliases":[],"length_aa":370,"mass_kda":43.3,"function":"Necessary for collagen type I synthesis. May couple the activity of the ER Ca(2+) pump SERCA2B with the activity of the translocon. This coupling may increase the local Ca(2+) concentration at the site of collagen synthesis, and a high Ca(2+) concentration may be necessary for the function of molecular chaperones involved in collagen folding. Required for proper insertion of the first transmembrane helix N-terminus of TM4SF20 into the ER lumen, may act as a ceramide sensor for regulated alternative translocation (RAT) (PubMed:27499293)","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q15035/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAM2","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRAM2","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":"608485","title":"TRANSLOCATION-ASSOCIATED MEMBRANE PROTEIN 2; TRAM2","url":"https://www.omim.org/entry/608485"},{"mim_id":"108740","title":"ATPase, Ca(2+)-TRANSPORTING, SLOW-TWITCH; ATP2A2","url":"https://www.omim.org/entry/108740"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAM2"},"hgnc":{"alias_symbol":["KIAA0057"],"prev_symbol":[]},"alphafold":{"accession":"Q15035","domains":[{"cath_id":"-","chopping":"51-55_65-325","consensus_level":"medium","plddt":92.7194,"start":51,"end":325},{"cath_id":"1.20.5","chopping":"14-45","consensus_level":"medium","plddt":92.1381,"start":14,"end":45}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15035","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15035-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15035-F1-predicted_aligned_error_v6.png","plddt_mean":85.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAM2","jax_strain_url":"https://www.jax.org/strain/search?query=TRAM2"},"sequence":{"accession":"Q15035","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15035.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15035/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15035"}},"corpus_meta":[{"pmid":"34923312","id":"PMC_34923312","title":"Exosomes-loaded 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Deletion of the C-terminal part of TRAM2 inhibits type I collagen synthesis during hepatic stellate cell activation. TRAM2 also co-precipitates with anti-collagen antibody, suggesting direct interaction. The pharmacological SERCA2b inhibitor thapsigargin phenocopies TRAM2 C-terminal deletion, inhibiting triple-helical collagen folding and increasing intracellular degradation.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, deletion mutagenesis, pharmacological inhibition (thapsigargin), hepatic stellate cell activation model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (Y2H, co-IP, mutagenesis, pharmacological) in a single rigorous study establishing interaction and functional consequence\",\n      \"pmids\": [\"14749390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRAM2 is required for translocation of the N-terminus of the first transmembrane helix of TM4SF20 into the ER lumen. In the absence of ceramide, TRAM2 facilitates this translocation; in the presence of ceramide, TM4SF20 translocation becomes TRAM2-independent and its membrane topology is inverted (regulated alternative translocation, RAT), leading to stimulation of CREB3L1 cleavage.\",\n      \"method\": \"Genetic knockdown/overexpression, topology assays, ceramide treatment, functional readout of CREB3L1 proteolytic processing\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic epistasis with defined substrate (TM4SF20), topology assays, and functional output; replicated across conditions in single rigorous study\",\n      \"pmids\": [\"27499293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM2 directly interacts with ceramide: using a photoactivatable and clickable short-chain ceramide analog (pac-C7-Cer), TRAM2 (and its homolog TRAM1) were identified as ceramide-binding proteins. This binding was competed by naturally occurring long-chain ceramides, and ceramide binding to TRAM2 correlated with the ability to induce regulated alternative translocation (RAT) of TM4SF20.\",\n      \"method\": \"Photoactivatable ceramide analog (pac-C7-Cer) crosslinking, click chemistry pulldown, competition assay with long-chain ceramides, functional RAT assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct biochemical crosslinking with competition controls plus functional validation of ceramide-binding relevance; multiple orthogonal methods\",\n      \"pmids\": [\"34793833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM2 directly interacts with SERCA2b and modulates SERCA2b activity to couple calcium enrichment with collagen biosynthesis in osteoblasts. Silencing TRAM2 disrupts the relationship between calcium concentration and collagen production, causing poor mineralization.\",\n      \"method\": \"Co-immunoprecipitation, TRAM2 silencing (siRNA/shRNA), biomineralization assay in osteoblasts\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and loss-of-function with defined phenotype in osteoblasts, single lab, replicates the SERCA2b interaction found in PMID:14749390\",\n      \"pmids\": [\"34047068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Tram2 is a direct transcriptional target of the osteoblast master regulator Runx2, identified by ChIP Display in MC3T3-E1 osteoblastic cells. Runx2 occupies a genomic region within the Tram2 locus. BMP-2 treatment relieves Runx2-mediated suppression of Tram2 in non-osteoblasts and coincides with increased Tram2 mRNA in multiple cell lines, placing Tram2 downstream of BMP/Runx2 signaling in osteoblast function.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP Display), mRNA expression analysis, BMP-2 treatment, Runx2 overexpression in multiple cell lines\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes direct Runx2 occupancy; functional mRNA regulation validated across multiple cell lines; single lab\",\n      \"pmids\": [\"17486635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Knockdown of TRAM2 in oral squamous cell carcinoma (OSCC) cells inhibits cell migration, invasiveness, and transendothelial migration, accompanied by significant decreases in PERK and matrix metalloproteinases MT1-MMP, MMP2, and MMP9, placing TRAM2 upstream of PERK and MMP activation in OSCC metastatic behavior.\",\n      \"method\": \"siRNA knockdown, migration/invasion/transendothelial migration assays, Western blotting for PERK and MMPs\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular pathway readouts (PERK, MMPs); single lab, multiple phenotypic assays\",\n      \"pmids\": [\"30271493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM2 is a transcriptional target of the YAP/TEAD4 enhancer axis. Genetic deletion of EnhancerTRAM2 reduces TRAM2 expression and phenocopies YAP loss-of-function in proliferation, migration, and invasion. FSTL-1 is identified as a major direct client (secreted factor) of TRAM2 involved in these oncogenic phenotypes.\",\n      \"method\": \"Genome-wide ChIP profiling (YAP/TEAD4), CRISPR-mediated enhancer deletion, proliferation/migration/invasion assays, identification of FSTL-1 as TRAM2 client\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR enhancer deletion with functional epistasis and downstream client identification; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"33514403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM2 silencing significantly reduces intracellular bacterial load of Staphylococcus aureus while restoring host cell viability. Treatment with the SERCA inhibitor thapsigargin (which targets the TRAM2-SERCA interaction) also halted intracellular MRSA survival, indicating TRAM2's role in supporting intracellular bacterial infection via its interaction with SERCA pumps.\",\n      \"method\": \"shRNA screen (genome-wide), TRAM2 silencing validation, thapsigargin treatment, intracellular bacterial load quantification\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA screen followed by functional validation with pharmacological confirmation; single lab\",\n      \"pmids\": [\"31659191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RBM15B, transcriptionally activated by YY1, regulates TRAM2 mRNA stability in an m6A-dependent manner in hepatocellular carcinoma cells, establishing a YY1-RBM15B-TRAM2 regulatory axis.\",\n      \"method\": \"m6A modification assay, RBM15B overexpression/knockdown, mRNA stability assay, luciferase and ChIP assays for YY1 binding\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A-dependent mRNA stability mechanism validated with multiple molecular approaches; single lab\",\n      \"pmids\": [\"35494016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-432-5p, secreted in exosomes from iPSC-MSCs, suppresses TRAM2 expression in corneal stromal stem cells, reducing collagen biosynthesis and ECM deposition (downregulating COL1A1, COL5A1, COL5A2 mRNA), and promoting corneal stroma regeneration.\",\n      \"method\": \"miRNA mimic/inhibitor transfection, luciferase reporter assay (implied by direct repression claim), mRNA expression analysis, in vivo corneal model\",\n      \"journal\": \"Biomaterials\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — miRNA-target relationship asserted with 'most probably linked to direct repression'; abstract does not explicitly describe luciferase validation; single lab\",\n      \"pmids\": [\"34923312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAM2 knockdown suppresses glioma cell proliferation, invasion, migration, and EMT in vitro and inhibits tumorigenicity in vivo. TRAM2 is positively associated with PI3K/AKT/mTOR signaling activation, and the PI3K activator 740Y-P reverses the effects of TRAM2 silencing, placing TRAM2 upstream of PI3K/AKT/mTOR in glioma.\",\n      \"method\": \"siRNA knockdown, PI3K pathway inhibition/activation (740Y-P), proliferation/invasion/migration assays, xenograft model\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — epistasis via single pharmacological rescue experiment; pathway placement indirect; single lab\",\n      \"pmids\": [\"34826698\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAM2 is a translocon-associated ER membrane protein that physically interacts with the Ca2+ pump SERCA2b via its C-terminal domain to locally elevate Ca2+ concentration at the site of collagen synthesis, thereby facilitating cotranslational folding and biosynthesis of type I collagen; TRAM2 also functions as a ceramide-binding protein that mediates regulated alternative translocation (RAT) of TM4SF20 — promoting ER-luminal insertion of TM4SF20's first transmembrane helix in the absence of ceramide, while ceramide binding releases this requirement and inverts TM4SF20 topology to activate CREB3L1 cleavage; transcriptionally, TRAM2 is regulated downstream of BMP/Runx2 signaling in osteoblasts and the YAP/TEAD4 enhancer axis in cancer, and its expression is post-transcriptionally controlled by m6A modification via RBM15B.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRAM2 is a translocon-associated endoplasmic reticulum membrane protein that couples local Ca2+ provision to collagen biosynthesis and governs the topology of select substrate proteins during their cotranslational insertion into the ER. Through its C-terminal domain, TRAM2 binds and modulates the ER Ca2+ pump SERCA2b to locally enrich Ca2+ at the site of collagen synthesis, a function required for proper triple-helical folding of type I collagen; loss of the C-terminus or pharmacological SERCA inhibition with thapsigargin blocks collagen folding and increases its intracellular degradation [#0], and in osteoblasts this SERCA2b coupling links Ca2+ to collagen production and biomineralization [#3]. In parallel, TRAM2 acts as a ceramide-binding protein that mediates regulated alternative translocation (RAT): it normally promotes ER-luminal translocation of the first transmembrane helix of TM4SF20, whereas ceramide binding releases this requirement and inverts TM4SF20 topology to activate CREB3L1 cleavage [#1, #2]. Transcriptionally, TRAM2 lies downstream of BMP/Runx2 signaling in osteoblasts, where Runx2 directly occupies the Tram2 locus and BMP-2 relieves its repression [#4], and downstream of a YAP/TEAD4 enhancer axis in cancer, where it supports proliferation, migration, and invasion in part through the secreted client FSTL-1 [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established the founding mechanistic role of TRAM2 by showing it physically couples the ER Ca2+ pump to collagen biosynthesis, explaining how an ER membrane protein enables proper triple-helical collagen folding.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, C-terminal deletion mutagenesis, and thapsigargin inhibition in a hepatic stellate cell activation model\",\n      \"pmids\": [\"14749390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct measurement of local Ca2+ elevation at the translocon not shown\", \"Whether collagen contacts TRAM2 directly versus via SERCA2b/Ca2+ not resolved\", \"Structural basis of the C-terminal SERCA2b interaction unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed TRAM2 transcriptionally within osteoblast differentiation by identifying it as a direct Runx2 target relieved by BMP-2, connecting its collagen-supporting function to a known bone master-regulator pathway.\",\n      \"evidence\": \"ChIP Display, Runx2 overexpression, and BMP-2 treatment with mRNA analysis across multiple cell lines\",\n      \"pmids\": [\"17486635\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of Runx2 occupancy on bone phenotype not tested\", \"Direct regulatory element within the locus not finely mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a second, topology-determining function: TRAM2 is required for ER-luminal translocation of a substrate transmembrane helix and is bypassed by ceramide to drive regulated alternative translocation and CREB3L1 activation.\",\n      \"evidence\": \"Knockdown/overexpression with topology assays and CREB3L1 cleavage readout under ceramide treatment\",\n      \"pmids\": [\"27499293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ceramide alters TRAM2-substrate engagement mechanistically not defined\", \"Breadth of substrates beyond TM4SF20 unknown\", \"Link between RAT function and collagen/SERCA2b function unexplored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the molecular basis of ceramide regulation by demonstrating TRAM2 directly binds ceramide, with binding correlating to its ability to trigger RAT.\",\n      \"evidence\": \"Photoactivatable clickable ceramide analog crosslinking, click-chemistry pulldown, long-chain ceramide competition, and functional RAT assay\",\n      \"pmids\": [\"34793833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ceramide-binding site on TRAM2 not mapped\", \"Stoichiometry and structural change upon binding unknown\", \"Whether ceramide binding affects the SERCA2b/collagen function not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the SERCA2b coupling model to bone by showing TRAM2 modulates SERCA2b activity to link Ca2+ enrichment with collagen production and mineralization.\",\n      \"evidence\": \"Co-immunoprecipitation, TRAM2 silencing, and biomineralization assays in osteoblasts\",\n      \"pmids\": [\"34047068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative effect on SERCA2b pump kinetics not measured\", \"Single lab\", \"In vivo bone phenotype not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected TRAM2 to oncogenic transcriptional control by identifying it as a YAP/TEAD4 enhancer target whose loss phenocopies YAP loss and whose function involves the secreted client FSTL-1.\",\n      \"evidence\": \"Genome-wide YAP/TEAD4 ChIP, CRISPR enhancer deletion with proliferation/migration/invasion assays, and FSTL-1 client identification\",\n      \"pmids\": [\"33514403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TRAM2 handles FSTL-1 as a client not defined\", \"Whether collagen/Ca2+ function underlies the oncogenic phenotype unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Implicated TRAM2-SERCA function in host support of intracellular bacterial infection, broadening the physiological relevance of the SERCA interaction.\",\n      \"evidence\": \"Genome-wide shRNA screen with silencing validation and thapsigargin treatment measuring intracellular MRSA load\",\n      \"pmids\": [\"31659191\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between TRAM2-SERCA Ca2+ and bacterial survival not dissected\", \"Whether collagen pathway is involved unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Added post-transcriptional control by establishing a YY1-RBM15B axis that stabilizes TRAM2 mRNA via m6A modification in hepatocellular carcinoma.\",\n      \"evidence\": \"m6A assays, RBM15B overexpression/knockdown, mRNA stability assays, and luciferase/ChIP for YY1 binding\",\n      \"pmids\": [\"35494016\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific m6A sites on TRAM2 transcript not mapped\", \"Downstream functional output of stabilized TRAM2 not detailed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Associated TRAM2 with additional cancer and ECM-regulatory contexts, suggesting broader roles in collagen/ECM output and tumor signaling.\",\n      \"evidence\": \"miRNA mimic/inhibitor and corneal model (miR-432-5p); siRNA with PI3K activator rescue and xenograft (glioma)\",\n      \"pmids\": [\"34923312\", \"34826698\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct miRNA-target repression not confirmed by luciferase in the corneal study\", \"PI3K/AKT/mTOR placement rests on single pharmacological rescue\", \"Mechanistic link to core TRAM2 ER functions not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRAM2's two molecular functions — SERCA2b/Ca2+-coupled collagen folding and ceramide-gated substrate translocation — are integrated within a single translocon-associated protein, and whether they share structural determinants, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of TRAM2\", \"Ceramide-binding and SERCA2b-binding interfaces not jointly mapped\", \"Unclear whether oncogenic phenotypes derive from collagen function, RAT function, or both\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0009609\", \"supporting_discovery_ids\": []}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ATP2A2\",\n      \"TM4SF20\",\n      \"COL1A1\",\n      \"FSTL1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":3,"faith_total":3,"faith_pct":100.0}}