{"gene":"SEC23IP","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1999,"finding":"p125 (SEC23IP) was identified as a novel mammalian Sec23p-interacting protein distinct from Sec24p. Using a GST-Sec23p fusion protein pulldown from mammalian cells, p125 was purified and characterized. The N-terminal proline-rich region of p125 mediates binding to Sec23p, confirmed by yeast two-hybrid assay. Overexpression of p125, like mammalian Sec23p, caused disorganization of the ER-Golgi intermediate compartment (ERGIC) and Golgi apparatus, implicating p125 in the early secretory pathway. p125 harbors sequence homology to phospholipid-modifying proteins, particularly phosphatidic acid-preferring phospholipase A1.","method":"GST pulldown, yeast two-hybrid, overexpression with organelle morphology readout (immunofluorescence)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding confirmed by GST pulldown and yeast two-hybrid, functional overexpression phenotype; Moderate evidence from single lab with multiple orthogonal methods","pmids":["10400679"],"is_preprint":false},{"year":2000,"finding":"The functional regions of p125 were mapped by deletion analysis: the proline-rich region (residues 135–259) is responsible for binding to Sec23p, while correct subcellular localization requires residues 135–1000 encompassing both the proline-rich and phospholipase A1 homology regions. Expressed p125 co-localizes with the vesicle-tethering proteins p115 and GM130 at ER-Golgi intermediate regions.","method":"Deletion mutagenesis, co-localization by immunofluorescence, co-localization with Golgi tethering markers","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — deletion mutagenesis with localization readout; single lab, moderate evidence","pmids":["11112430"],"is_preprint":false},{"year":2002,"finding":"A paralog of p125, KIAA0725p, was identified and shown to possess phospholipase A1 activity preferentially for phosphatidic acid, whereas p125 itself lacks the Sec23p-interacting proline-rich N-terminal region in the paralog. In vitro binding showed KIAA0725p does not bind Sec23p. This established that p125 belongs to a phosphatidic acid-preferring phospholipase A1 protein family, and that the lipase homology domain and Sec23p-binding activity are separable functions.","method":"In vitro binding assay, in vitro phospholipase A1 enzymatic assay, organelle morphology by immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1/2 — in vitro enzymatic assay on paralog clarifies domain function of p125; single lab","pmids":["11788596"],"is_preprint":false},{"year":2004,"finding":"p125 (SEC23IP) was localized by immunofluorescence and electron microscopy to ER exit sites (ERES), the sites where COPII-coated vesicles bud. The p125-specific N-terminal region is critical for ERES localization (chimeric protein analysis). RNAi-mediated depletion of p125 disturbed the organization of ERES and substantially disrupted cis-Golgi structure, without significantly delaying protein export from the ER, suggesting p125 is a mammalian-specific organizer of ERES architecture.","method":"Immunofluorescence microscopy, electron microscopy, chimeric protein domain-swap analysis, RNAi knockdown with organelle morphology readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct localization by EM and IF with functional KD phenotype; multiple orthogonal methods in single study","pmids":["15623529"],"is_preprint":false},{"year":2010,"finding":"p125A (SEC23IP) was shown to interact not only with Sec23A but also with the C-terminal region of Sec31A, via a distinct domain (residues 260–600). Gel filtration and immunodepletion studies demonstrated that the majority of cytosolic p125A exists as a ternary complex with Sec13/Sec31A, forming preassembled Sec13/Sec31A/p125A heterohexamers. Silencing p125A affected Golgi morphology and impaired protein export from the ER, placing p125A as a component of the Sec13/Sec31A outer COPII subcomplex.","method":"Co-immunoprecipitation, gel filtration, immunodepletion, RNAi knockdown with ER export and Golgi morphology readouts","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, gel filtration, immunodepletion, and functional KD; multiple orthogonal methods showing ternary complex","pmids":["20679433"],"is_preprint":false},{"year":2011,"finding":"p125/Sec23ip knockout mice are viable and grow normally but males are subfertile. Sperm from knockout mice have round heads and lack the acrosome, the enzyme-containing organelle essential for fertilization. p125 is expressed during stages I–XII of spermatogenesis, coinciding with acrosome biogenesis. This established an essential in vivo role for Sec23ip in spermiogenesis, specifically acrosome formation.","method":"Gene knockout mouse model, histological and morphological analysis of sperm, immunostaining for stage-specific expression","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific and well-defined cellular phenotype (acrosome loss); strong evidence from in vivo model","pmids":["21640725"],"is_preprint":false},{"year":2020,"finding":"Sec23ip was identified as part of the 14-3-3γ protein interaction network in MA-10 Leydig cells by LC-MS proteomics. siRNA-mediated silencing of Sec23ip decreased steroidogenesis, and cholesterol mobilization from the cytoplasmic membrane to mitochondria was impaired in Sec23ip-silenced cells, suggesting Sec23ip contributes to cholesterol trafficking required for acute steroid hormone production.","method":"LC-MS proteomics (co-IP with 14-3-3γ), siRNA knockdown with steroidogenesis assay and cholesterol trafficking readout","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 — single pulldown/MS identification plus siRNA phenotype; single lab, single method per finding","pmids":["31875919"],"is_preprint":false},{"year":2024,"finding":"Sec23IP at ER exit sites (ERES) was identified as a VPS13B/COH1 adaptor. VPS13B interacts directly with Sec23IP via its VPS13 adaptor binding domain (VAB). Disease-associated missense mutations in VPS13B-VAB impair interaction with Sec23IP. Knockout of VPS13B or Sec23IP blocks formation of tubular ERGIC (a cargo carrier for ER-to-Golgi transport) and delays ER export of procollagen, linking Sec23IP to procollagen secretion and potentially to joint laxity in Cohen syndrome patients.","method":"Co-immunoprecipitation (direct interaction), knockout cell lines, live imaging of ERGIC tubule formation, procollagen ER export assay, disease mutation analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct interaction confirmed by co-IP, functional KO phenotype with specific cargo (procollagen), disease mutations validated; multiple orthogonal methods","pmids":["39352497"],"is_preprint":false},{"year":2025,"finding":"Using cell-free reconstitutions, p125A (Sec23ip) was shown to bind phosphatidylinositol 4-phosphate (PI4P), Sec31, and Sec23 simultaneously, stabilizing contact between ER exit site (donor) membranes and ERGIC/cis-Golgi (acceptor) membranes. This membrane apposition promoted COPII outer layer (Sec13/31) assembly. In cells lacking p125A, outer COPII coat assembly was selectively destabilized. Transcriptome and secretome analyses revealed selective impairment of fibrillar collagen secretion in p125A-deficient cells, with p125A specifically coupling COPII outer coat assembly to tunnel-based collagen traffic.","method":"Cell-free membrane reconstitution, COPII coat assembly assay, PI4P-binding assay, p125A-chimera domain swap, ERES imaging in KO cells, transcriptomics and secretome mass spectrometry","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — cell-free reconstitution with mutagenesis and chimeric proteins, supported by KO cell transcriptome/secretome; multiple orthogonal methods in single preprint","pmids":["40463098"],"is_preprint":true}],"current_model":"SEC23IP (p125A) is a mammalian-specific COPII accessory protein that localizes to ER exit sites (ERES), where it simultaneously binds Sec23 (via its N-terminal proline-rich region), Sec31 (via residues 260–600), and PI4P-rich ERGIC/cis-Golgi membranes to stabilize donor–acceptor membrane apposition, promote outer COPII coat assembly, and facilitate tunnel-based ER-to-Golgi transport of large cargoes including fibrillar collagens; it also serves as an adaptor for VPS13B/COH1 at the ERES–Golgi interface, is required in vivo for acrosome biogenesis during spermiogenesis, and contributes to cholesterol trafficking for steroidogenesis in Leydig cells."},"narrative":{"teleology":[{"year":1999,"claim":"The discovery of p125 as a novel Sec23-interacting protein distinct from Sec24 established that mammalian COPII vesicle formation involves additional regulatory partners beyond the conserved yeast components.","evidence":"GST-Sec23p pulldown from mammalian cells, yeast two-hybrid confirmation of proline-rich region binding, overexpression phenotype disrupting ERGIC/Golgi","pmids":["10400679"],"confidence":"High","gaps":["Endogenous lipase activity of p125 not determined","Binding stoichiometry with Sec23 unknown","No loss-of-function data"]},{"year":2002,"claim":"Characterization of a p125 paralog (KIAA0725p) with phospholipase A1 activity but lacking the Sec23-binding region showed that the lipase homology domain and COPII-binding functions are separable, raising the question of whether p125 itself possesses enzymatic activity.","evidence":"In vitro phospholipase A1 assay on paralog, in vitro binding showing paralog does not bind Sec23p","pmids":["11788596"],"confidence":"Medium","gaps":["Whether p125 retains catalytic lipase activity remains untested in this study","Functional redundancy between p125 and paralog unexplored"]},{"year":2004,"claim":"Localization of p125 to ER exit sites by electron microscopy and demonstration that its depletion disorganizes ERES and cis-Golgi architecture established p125 as a structural organizer of COPII budding sites, rather than merely a Sec23 binding partner.","evidence":"Immunofluorescence and electron microscopy localization, chimeric domain-swap analysis, RNAi knockdown with organelle morphology readout","pmids":["15623529"],"confidence":"High","gaps":["Mechanism by which p125 organizes ERES not resolved","Whether cargo export is affected remained unclear at this stage"]},{"year":2010,"claim":"The finding that p125A binds Sec31A (residues 260–600) and exists as preassembled cytosolic Sec13/Sec31A/p125A heterohexamers revealed that p125A is an integral component of the outer COPII coat complex, not merely a Sec23 accessory factor.","evidence":"Co-immunoprecipitation, gel filtration, immunodepletion of cytosolic complexes, RNAi with ER export and Golgi morphology readouts","pmids":["20679433"],"confidence":"High","gaps":["Structural basis of ternary complex unknown","Whether p125A binding to Sec31 and Sec23 is simultaneous or sequential was unresolved"]},{"year":2011,"claim":"Knockout mice demonstrated that Sec23ip is dispensable for general viability but essential for acrosome biogenesis during spermiogenesis, revealing a specialized in vivo cargo-trafficking role.","evidence":"Gene knockout mouse model with histological and morphological sperm analysis","pmids":["21640725"],"confidence":"High","gaps":["Which specific cargo trafficking step in acrosome biogenesis requires Sec23ip is unknown","Whether other specialized secretory tissues are affected remains unexplored"]},{"year":2020,"claim":"Identification of Sec23ip in the 14-3-3γ interactome of Leydig cells and its requirement for cholesterol mobilization during steroidogenesis extended its trafficking roles beyond canonical ER-to-Golgi transport.","evidence":"LC-MS co-IP proteomics with 14-3-3γ, siRNA knockdown with steroidogenesis and cholesterol trafficking assays in MA-10 cells","pmids":["31875919"],"confidence":"Medium","gaps":["Direct physical interaction between Sec23ip and 14-3-3γ not validated by reciprocal methods","Mechanism of cholesterol trafficking contribution uncharacterized","Single cell-line system"]},{"year":2024,"claim":"The identification of SEC23IP as the ERES adaptor for VPS13B/COH1 bridged COPII vesicle budding to lipid transfer-dependent ERGIC tubule formation, and disease mutations in VPS13B-VAB that disrupt this interaction explained a molecular basis for procollagen export defects relevant to Cohen syndrome.","evidence":"Co-immunoprecipitation of direct VPS13B–SEC23IP interaction, knockout cell lines with live imaging of ERGIC tubules, procollagen ER export assay, disease mutation analysis","pmids":["39352497"],"confidence":"High","gaps":["Whether SEC23IP–VPS13B interaction is sufficient for tubule formation or requires additional factors is unknown","In vivo confirmation in animal models lacking"]},{"year":2025,"claim":"Cell-free reconstitution demonstrated that p125A simultaneously binds PI4P, Sec31, and Sec23 to tether donor (ERES) and acceptor (ERGIC/cis-Golgi) membranes, providing the first mechanistic explanation for how outer COPII coat assembly is coupled to tunnel-based transport of fibrillar collagens.","evidence":"Cell-free membrane reconstitution, COPII coat assembly and PI4P-binding assays, chimeric domain swaps, KO cell transcriptomics and secretome mass spectrometry (preprint)","pmids":["40463098"],"confidence":"High","gaps":["Preprint awaiting peer review","Structural basis of simultaneous tripartite binding unresolved","Whether PI4P binding is essential in vivo not tested"]},{"year":null,"claim":"Key unresolved questions include whether SEC23IP possesses intrinsic lipase activity, the atomic structure of the SEC23IP–Sec23–Sec31 ternary complex, and the precise cargo repertoire beyond collagens that depends on SEC23IP-mediated membrane tethering.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure available","Catalytic competence of the lipase homology domain untested for p125 itself","Full spectrum of SEC23IP-dependent cargoes undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,4,7,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,3,4,7,8]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,8]}],"complexes":["COPII outer coat (Sec13/Sec31A/p125A)"],"partners":["SEC23A","SEC31A","SEC13","VPS13B"],"other_free_text":[]},"mechanistic_narrative":"SEC23IP (p125A) is a COPII accessory protein that organizes ER exit sites and facilitates ER-to-Golgi transport, with particular importance for large cargo secretion and acrosome biogenesis. It binds Sec23 via an N-terminal proline-rich region and Sec31 via a central domain (residues 260–600), forming preassembled Sec13/Sec31A/SEC23IP heterohexamers that promote outer COPII coat assembly, while simultaneously engaging PI4P-containing acceptor membranes to stabilize donor–acceptor membrane apposition required for tunnel-based collagen transport [PMID:10400679, PMID:20679433, PMID:40463098]. SEC23IP also functions as an adaptor for VPS13B/COH1 at the ERES–ERGIC interface, and loss of this interaction blocks tubular ERGIC formation and delays procollagen export, linking it mechanistically to Cohen syndrome pathology [PMID:39352497]. Knockout mice reveal an essential in vivo role in acrosome formation during spermiogenesis, with males producing round-headed, acrosome-less sperm and exhibiting subfertility [PMID:21640725]."},"prefetch_data":{"uniprot":{"accession":"Q9Y6Y8","full_name":"SEC23-interacting protein","aliases":["p125"],"length_aa":1000,"mass_kda":111.1,"function":"Plays a role in the organization of endoplasmic reticulum exit sites. Specifically binds to phosphatidylinositol 3-phosphate (PI(3)P), phosphatidylinositol 4-phosphate (PI(4)P) and phosphatidylinositol 5-phosphate (PI(5)P)","subcellular_location":"Cytoplasmic vesicle, COPII-coated vesicle membrane; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q9Y6Y8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SEC23IP","classification":"Not Classified","n_dependent_lines":65,"n_total_lines":1208,"dependency_fraction":0.05380794701986755},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PDCD6","stoichiometry":10.0},{"gene":"SEC13","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SEC23IP","total_profiled":1310},"omim":[{"mim_id":"617852","title":"SEC23-INTERACTING PROTEIN; SEC23IP","url":"https://www.omim.org/entry/617852"},{"mim_id":"614603","title":"DDHD DOMAIN-CONTAINING PROTEIN 1; DDHD1","url":"https://www.omim.org/entry/614603"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Vesicles","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SEC23IP"},"hgnc":{"alias_symbol":["p125","iPLA1beta","iPLA1β","p125A"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6Y8","domains":[{"cath_id":"-","chopping":"273-406_420-427","consensus_level":"high","plddt":87.9116,"start":273,"end":427},{"cath_id":"-","chopping":"456-466_490-597_777-859_938-975","consensus_level":"high","plddt":83.925,"start":456,"end":975},{"cath_id":"1.10.150.50","chopping":"651-712","consensus_level":"high","plddt":87.9566,"start":651,"end":712}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Y8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Y8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Y8-F1-predicted_aligned_error_v6.png","plddt_mean":64.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SEC23IP","jax_strain_url":"https://www.jax.org/strain/search?query=SEC23IP"},"sequence":{"accession":"Q9Y6Y8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6Y8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6Y8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Y8"}},"corpus_meta":[{"pmid":"8314789","id":"PMC_8314789","title":"Bombesin stimulation of p125 focal adhesion kinase tyrosine phosphorylation. 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The N-terminal proline-rich region of p125 mediates the interaction with Sec23p. Overexpression of p125, like mammalian Sec23p, caused disorganization of the ER-Golgi intermediate compartment and Golgi apparatus, implicating it in the early secretory pathway.\",\n      \"method\": \"GST pulldown with mouse Sec23p, transient co-expression in mammalian cells, yeast two-hybrid assay, overexpression phenotype analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (GST pulldown, co-expression, yeast two-hybrid) in single foundational paper\",\n      \"pmids\": [\"10400679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The proline-rich region of p125 (residues 135–259) is responsible for binding to Sec23p. For correct subcellular localization of p125, a larger region (residues 135–1000) comprising both the proline-rich and phospholipase A1 homology regions is required. Expressed p125 co-localizes principally with p115 and GM130, Golgi tethering proteins.\",\n      \"method\": \"Deletion mutant expression in cultured cells, immunofluorescence co-localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping by deletion mutants with defined localization readout, single lab\",\n      \"pmids\": [\"11112430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A paralog of SEC23IP, KIAA0725p (lacking the N-terminal proline-rich Sec23p-interacting region), possesses phospholipase A1 activity preferentially for phosphatidic acid in vitro. The in vitro binding analysis confirmed that KIAA0725p does not bind Sec23p, while the corresponding region of SEC23IP is required for this interaction.\",\n      \"method\": \"In vitro binding analysis, phospholipase A1 activity assay, overexpression in cultured cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — enzymatic assay and binding study; defines SEC23IP domain function by comparison with paralog\",\n      \"pmids\": [\"11788596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SEC23IP (p125) is principally localized to ER exit sites (ERES) as determined by immunofluorescence and electron microscopy. The p125-specific N-terminal region is critical for ERES localization; the putative lipase domain is interchangeable with the KIAA0725p lipase domain but not with PA-PLA1. RNAi-mediated depletion of p125 disrupted ERES organization and substantially disturbed cis-Golgi structure, but did not significantly delay bulk protein export from the ER.\",\n      \"method\": \"Immunofluorescence microscopy, electron microscopy, chimeric protein expression, RNAi knockdown with organelle morphology readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (EM, IF, domain chimeras, RNAi loss-of-function) with defined organelle phenotype\",\n      \"pmids\": [\"15623529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The majority of cytosolic SEC23IP (p125A) exists as a preassembled ternary complex with Sec13/Sec31A (as heterohexamers), in addition to its known interaction with Sec23A. The Sec31A-interacting domain of p125A maps to residues 260–600, distinct from the Sec23A-interacting N-terminal domain. Silencing p125A affected Golgi morphology and ER protein export.\",\n      \"method\": \"Gel filtration, immunodepletion, reciprocal co-immunoprecipitation, siRNA knockdown with secretory pathway readout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, gel filtration, and immunodepletion establish ternary complex; knockdown shows functional consequence\",\n      \"pmids\": [\"20679433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Knockout of p125/Sec23ip in mice results in male subfertility. Sperm from p125-deficient mice have round heads and lack the acrosome, indicating that p125 is required for acrosome biogenesis during spermiogenesis. p125 expression mirrors that of acrosome biogenesis proteins at stages I–XII of spermatogenesis.\",\n      \"method\": \"Knockout mouse generation, sperm morphology analysis, immunofluorescence of expression pattern\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO mouse with specific cellular phenotype (acrosome loss) and defined expression pattern\",\n      \"pmids\": [\"21640725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Sec23ip was identified as part of the 14-3-3γ protein interaction network in MA-10 Leydig cells. Silencing of Sec23ip reduced steroidogenesis and impaired cholesterol mobilization from the cytoplasmic membrane to mitochondria, indicating a role for Sec23ip in vesicle trafficking that supplies cholesterol for acute testosterone production.\",\n      \"method\": \"LC-MS proteomics of 14-3-3γ interactome, siRNA knockdown, steroidogenesis and cholesterol trafficking assays\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — MS-identified interaction plus functional RNAi knockdown phenotype; single lab\",\n      \"pmids\": [\"31875919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Sec23IP (p125A) recruits VPS13B/COH1 to ER exit site–Golgi interfaces via a direct interaction between VPS13B's VAB (VPS13 adaptor binding) domain and Sec23IP. This interaction promotes ERES–Golgi association. Knockout of VPS13B or Sec23IP blocks formation of tubular ERGIC cargo carriers and delays ER export of procollagen. Disease-associated missense mutations in VPS13B-VAB impair binding to Sec23IP.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assay, KO cell lines, live imaging of ERGIC tubule formation, procollagen secretion assay, disease-mutation functional analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct interaction mapped, KO functional phenotype, disease mutations validated, multiple orthogonal methods\",\n      \"pmids\": [\"39352497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SEC23IP (p125A) bridges the COPII outer layer (Sec13/Sec31) at ERES to PI4P-rich ERGIC/cis-Golgi acceptor membranes by binding PI4P, Sec31, and Sec23 simultaneously. In cell-free reconstitutions, p125A stabilized donor–acceptor membrane contact and promoted COPII outer layer assembly; a p125A chimera with a Golgi-targeted PI4P-binding domain rescued outer layer assembly. Loss of p125A selectively destabilized COPII outer layer assembly and inhibited fibrillar collagen secretion from the ER.\",\n      \"method\": \"Cell-free membrane reconstitution, chimeric protein rescue, transcriptome and secretome analysis, collagen trafficking assay in p125A-deficient cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-free reconstitution with mechanistic dissection, chimera rescue, and selective secretory phenotype in KO cells\",\n      \"pmids\": [\"40463098\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SEC23IP (p125A) is a mammalian-specific COPII accessory protein that localizes to ER exit sites via its N-terminal proline-rich domain (which binds Sec23) and residues 260–600 (which bind Sec31A), forming a preassembled Sec13/Sec31A/p125A heterohexamer in the cytosol; at ERES it bridges the COPII outer coat to PI4P-rich ERGIC/cis-Golgi acceptor membranes to coordinate COPII assembly with tunnel-based traffic, is required for ERES organization, tubular ERGIC formation, and fibrillar collagen secretion, recruits VPS13B to the ERES–Golgi interface, and is essential in vivo for acrosome biogenesis during spermiogenesis and for cholesterol trafficking supporting steroidogenesis in Leydig cells.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nPapers about SEC23IP (the canonical Sec23-interacting protein involved in COPII/ER exit sites):\n- KEEP: [7], [9], [13], [18], [26], [30], [40], [54], [58] — these describe the canonical SEC23IP/p125A protein\n\nPapers about p125FAK (focal adhesion kinase) — ALIAS COLLISION:\n- EXCLUDE: [1], [2], [3], [4], [5], [6], [10], [11], [15], [16], [20], [21], [22], [23], [24], [25], [37], [38], [39], [41], [42], [44], [45], [46], [48], [52], [53]\n\nPapers about p125 subunit of DNA polymerase delta (POLD1) — ALIAS COLLISION:\n- EXCLUDE: [12], [13-no, wait], [14], [29], [31], [33], [34], [50]\n\nPapers about pestivirus p125 protein — SYMBOL COLLISION (viral protein):\n- EXCLUDE: [17], [19], [27], [49]\n\nPapers about p125 DDB subunit (XPE/DDB2) — ALIAS COLLISION:\n- EXCLUDE: [8]\n\nPapers about endostatin P125A mutation — ALIAS COLLISION (different entity):\n- EXCLUDE: [36], [43], [47], [56]\n\nPapers about p125 GAP — ALIAS COLLISION:\n- EXCLUDE: [35], [57]\n\nPapers about p125/6.5 nuclear matrix antigen — ALIAS COLLISION:\n- EXCLUDE: [55]\n\nPapers about beta cell p125 tyrosine phosphorylation — ambiguous, not SEC23IP:\n- EXCLUDE: [28]\n\nPapers about SEC23IP::VGLL3 gene fusion in sarcoma — mentions SEC23IP but only as fusion partner, no mechanistic data about SEC23IP protein itself:\n- EXCLUDE [51] (no mechanistic finding about SEC23IP protein function)\n\nAdditional curated papers:\n- Most are large-scale interactome/proteomics studies. KEEP those that specifically identify SEC23IP interactions or function: [24] (identifies SEC23IP as Waardenburg gene candidate via phenologs — indirect), others are generic proteomics resources.\n- EXCLUDE generic proteomics resource papers that don't specifically characterize SEC23IP mechanism.\n- KEEP [24] for the functional prediction of SEC23IP.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"p125 (SEC23IP) was identified as a novel mammalian Sec23p-interacting protein distinct from Sec24p. Using a GST-Sec23p fusion protein pulldown from mammalian cells, p125 was purified and characterized. The N-terminal proline-rich region of p125 mediates binding to Sec23p, confirmed by yeast two-hybrid assay. Overexpression of p125, like mammalian Sec23p, caused disorganization of the ER-Golgi intermediate compartment (ERGIC) and Golgi apparatus, implicating p125 in the early secretory pathway. p125 harbors sequence homology to phospholipid-modifying proteins, particularly phosphatidic acid-preferring phospholipase A1.\",\n      \"method\": \"GST pulldown, yeast two-hybrid, overexpression with organelle morphology readout (immunofluorescence)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding confirmed by GST pulldown and yeast two-hybrid, functional overexpression phenotype; Moderate evidence from single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10400679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The functional regions of p125 were mapped by deletion analysis: the proline-rich region (residues 135–259) is responsible for binding to Sec23p, while correct subcellular localization requires residues 135–1000 encompassing both the proline-rich and phospholipase A1 homology regions. Expressed p125 co-localizes with the vesicle-tethering proteins p115 and GM130 at ER-Golgi intermediate regions.\",\n      \"method\": \"Deletion mutagenesis, co-localization by immunofluorescence, co-localization with Golgi tethering markers\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — deletion mutagenesis with localization readout; single lab, moderate evidence\",\n      \"pmids\": [\"11112430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A paralog of p125, KIAA0725p, was identified and shown to possess phospholipase A1 activity preferentially for phosphatidic acid, whereas p125 itself lacks the Sec23p-interacting proline-rich N-terminal region in the paralog. In vitro binding showed KIAA0725p does not bind Sec23p. This established that p125 belongs to a phosphatidic acid-preferring phospholipase A1 protein family, and that the lipase homology domain and Sec23p-binding activity are separable functions.\",\n      \"method\": \"In vitro binding assay, in vitro phospholipase A1 enzymatic assay, organelle morphology by immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro enzymatic assay on paralog clarifies domain function of p125; single lab\",\n      \"pmids\": [\"11788596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p125 (SEC23IP) was localized by immunofluorescence and electron microscopy to ER exit sites (ERES), the sites where COPII-coated vesicles bud. The p125-specific N-terminal region is critical for ERES localization (chimeric protein analysis). RNAi-mediated depletion of p125 disturbed the organization of ERES and substantially disrupted cis-Golgi structure, without significantly delaying protein export from the ER, suggesting p125 is a mammalian-specific organizer of ERES architecture.\",\n      \"method\": \"Immunofluorescence microscopy, electron microscopy, chimeric protein domain-swap analysis, RNAi knockdown with organelle morphology readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by EM and IF with functional KD phenotype; multiple orthogonal methods in single study\",\n      \"pmids\": [\"15623529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"p125A (SEC23IP) was shown to interact not only with Sec23A but also with the C-terminal region of Sec31A, via a distinct domain (residues 260–600). Gel filtration and immunodepletion studies demonstrated that the majority of cytosolic p125A exists as a ternary complex with Sec13/Sec31A, forming preassembled Sec13/Sec31A/p125A heterohexamers. Silencing p125A affected Golgi morphology and impaired protein export from the ER, placing p125A as a component of the Sec13/Sec31A outer COPII subcomplex.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration, immunodepletion, RNAi knockdown with ER export and Golgi morphology readouts\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, gel filtration, immunodepletion, and functional KD; multiple orthogonal methods showing ternary complex\",\n      \"pmids\": [\"20679433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p125/Sec23ip knockout mice are viable and grow normally but males are subfertile. Sperm from knockout mice have round heads and lack the acrosome, the enzyme-containing organelle essential for fertilization. p125 is expressed during stages I–XII of spermatogenesis, coinciding with acrosome biogenesis. This established an essential in vivo role for Sec23ip in spermiogenesis, specifically acrosome formation.\",\n      \"method\": \"Gene knockout mouse model, histological and morphological analysis of sperm, immunostaining for stage-specific expression\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific and well-defined cellular phenotype (acrosome loss); strong evidence from in vivo model\",\n      \"pmids\": [\"21640725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Sec23ip was identified as part of the 14-3-3γ protein interaction network in MA-10 Leydig cells by LC-MS proteomics. siRNA-mediated silencing of Sec23ip decreased steroidogenesis, and cholesterol mobilization from the cytoplasmic membrane to mitochondria was impaired in Sec23ip-silenced cells, suggesting Sec23ip contributes to cholesterol trafficking required for acute steroid hormone production.\",\n      \"method\": \"LC-MS proteomics (co-IP with 14-3-3γ), siRNA knockdown with steroidogenesis assay and cholesterol trafficking readout\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single pulldown/MS identification plus siRNA phenotype; single lab, single method per finding\",\n      \"pmids\": [\"31875919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Sec23IP at ER exit sites (ERES) was identified as a VPS13B/COH1 adaptor. VPS13B interacts directly with Sec23IP via its VPS13 adaptor binding domain (VAB). Disease-associated missense mutations in VPS13B-VAB impair interaction with Sec23IP. Knockout of VPS13B or Sec23IP blocks formation of tubular ERGIC (a cargo carrier for ER-to-Golgi transport) and delays ER export of procollagen, linking Sec23IP to procollagen secretion and potentially to joint laxity in Cohen syndrome patients.\",\n      \"method\": \"Co-immunoprecipitation (direct interaction), knockout cell lines, live imaging of ERGIC tubule formation, procollagen ER export assay, disease mutation analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction confirmed by co-IP, functional KO phenotype with specific cargo (procollagen), disease mutations validated; multiple orthogonal methods\",\n      \"pmids\": [\"39352497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Using cell-free reconstitutions, p125A (Sec23ip) was shown to bind phosphatidylinositol 4-phosphate (PI4P), Sec31, and Sec23 simultaneously, stabilizing contact between ER exit site (donor) membranes and ERGIC/cis-Golgi (acceptor) membranes. This membrane apposition promoted COPII outer layer (Sec13/31) assembly. In cells lacking p125A, outer COPII coat assembly was selectively destabilized. Transcriptome and secretome analyses revealed selective impairment of fibrillar collagen secretion in p125A-deficient cells, with p125A specifically coupling COPII outer coat assembly to tunnel-based collagen traffic.\",\n      \"method\": \"Cell-free membrane reconstitution, COPII coat assembly assay, PI4P-binding assay, p125A-chimera domain swap, ERES imaging in KO cells, transcriptomics and secretome mass spectrometry\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-free reconstitution with mutagenesis and chimeric proteins, supported by KO cell transcriptome/secretome; multiple orthogonal methods in single preprint\",\n      \"pmids\": [\"40463098\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SEC23IP (p125A) is a mammalian-specific COPII accessory protein that localizes to ER exit sites (ERES), where it simultaneously binds Sec23 (via its N-terminal proline-rich region), Sec31 (via residues 260–600), and PI4P-rich ERGIC/cis-Golgi membranes to stabilize donor–acceptor membrane apposition, promote outer COPII coat assembly, and facilitate tunnel-based ER-to-Golgi transport of large cargoes including fibrillar collagens; it also serves as an adaptor for VPS13B/COH1 at the ERES–Golgi interface, is required in vivo for acrosome biogenesis during spermiogenesis, and contributes to cholesterol trafficking for steroidogenesis in Leydig cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SEC23IP (p125A) is a COPII accessory protein that coordinates vesicle coat assembly at ER exit sites with acceptor membrane recognition to support selective cargo export in the early secretory pathway. It binds Sec23 via its N-terminal proline-rich domain (residues 135–259) and Sec31A via residues 260–600, forming a preassembled Sec13/Sec31A/p125A heterohexameric complex in the cytosol that stabilizes COPII outer coat assembly at ERES; simultaneously, its C-terminal lipase-homology domain binds PI4P on ERGIC/cis-Golgi membranes, thereby bridging donor and acceptor compartments [PMID:10400679, PMID:20679433, PMID:40463098]. SEC23IP recruits VPS13B to the ERES–Golgi interface to promote tubular ERGIC formation and procollagen export, and its loss disrupts ERES organization, Golgi morphology, and fibrillar collagen secretion [PMID:15623529, PMID:39352497]. In vivo, Sec23ip knockout in mice causes acrosome loss during spermiogenesis resulting in male subfertility, and Sec23ip silencing in Leydig cells impairs cholesterol trafficking required for steroidogenesis [PMID:21640725, PMID:31875919].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of SEC23IP as a novel Sec23-interacting protein established that the mammalian COPII machinery includes accessory factors beyond the conserved yeast coat subunits, and that its overexpression perturbs ERGIC/Golgi organization.\",\n      \"evidence\": \"GST pulldown, yeast two-hybrid, and overexpression phenotyping in mammalian cells\",\n      \"pmids\": [\"10400679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endogenous localization not yet determined\",\n        \"Loss-of-function phenotype not tested\",\n        \"Functional significance of the lipase-homology domain unknown\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Comparison with the SEC23IP paralog KIAA0725p showed that the proline-rich N-terminus unique to SEC23IP confers Sec23 binding, while the shared C-terminal domain possesses phospholipase A1-like activity, separating coat-binding and lipid-metabolizing functions.\",\n      \"evidence\": \"In vitro phospholipase A1 assay and binding analysis comparing SEC23IP and KIAA0725p domains\",\n      \"pmids\": [\"11788596\", \"11112430\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether SEC23IP itself has catalytic lipase activity in vivo remains untested\",\n        \"Lipid substrate specificity of the SEC23IP lipase domain not directly measured\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that SEC23IP localizes to ERES by EM and that its RNAi depletion disrupts ERES and cis-Golgi structure established it as functionally required for ERES organization, though bulk ER-to-Golgi transport was not significantly delayed.\",\n      \"evidence\": \"Immunofluorescence, electron microscopy, domain chimeras, and RNAi knockdown in cultured cells\",\n      \"pmids\": [\"15623529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether specific cargo classes are selectively affected was not tested\",\n        \"Mechanism by which SEC23IP organizes ERES unknown\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that cytosolic SEC23IP exists in a preassembled heterohexameric complex with Sec13/Sec31A, binding Sec31A through residues 260–600, revealed that SEC23IP is an integral component of the COPII outer coat assembly unit rather than a transient interactor.\",\n      \"evidence\": \"Gel filtration, reciprocal co-immunoprecipitation, immunodepletion, and siRNA knockdown\",\n      \"pmids\": [\"20679433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the Sec31A–p125A interaction not resolved\",\n        \"Whether the heterohexamer assembles co-translationally or post-translationally unknown\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Knockout mice revealed an essential in vivo role for SEC23IP in acrosome biogenesis during spermiogenesis, linking COPII-associated trafficking to a specific organelle-building process and explaining male subfertility.\",\n      \"evidence\": \"Sec23ip knockout mouse, sperm morphology analysis, immunofluorescence staging\",\n      \"pmids\": [\"21640725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which cargo or membrane source for acrosome assembly requires SEC23IP is undefined\",\n        \"Whether female reproductive phenotypes exist was not explored\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of SEC23IP in the 14-3-3γ interactome and demonstration that its silencing impairs cholesterol mobilization and steroidogenesis in Leydig cells extended its trafficking role beyond conventional secretory cargo to intracellular cholesterol transport.\",\n      \"evidence\": \"LC-MS proteomics, siRNA knockdown, steroidogenesis and cholesterol trafficking assays in MA-10 cells\",\n      \"pmids\": [\"31875919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between SEC23IP and 14-3-3γ not validated by reciprocal method\",\n        \"Mechanism connecting COPII coat function to cholesterol mobilization unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that SEC23IP directly recruits VPS13B to the ERES–Golgi interface, and that loss of either protein blocks tubular ERGIC formation and delays procollagen export, connected COPII coat accessory function to lipid-transfer-mediated membrane remodeling and collagen secretion.\",\n      \"evidence\": \"Co-immunoprecipitation, direct binding assay, KO cell lines, live imaging, procollagen secretion assay, disease-mutation analysis\",\n      \"pmids\": [\"39352497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether VPS13B lipid transfer activity is required downstream of SEC23IP recruitment is untested\",\n        \"Structural basis of SEC23IP–VPS13B-VAB interaction not resolved\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cell-free reconstitution showed SEC23IP bridges COPII-coated donor membranes to PI4P-rich acceptor membranes by simultaneously binding Sec23, Sec31, and PI4P, stabilizing outer coat assembly; a PI4P-targeted chimera rescued coat assembly, and SEC23IP loss selectively impaired fibrillar collagen secretion.\",\n      \"evidence\": \"Cell-free membrane reconstitution, chimeric rescue, transcriptome/secretome analysis (preprint)\",\n      \"pmids\": [\"40463098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Preprint; awaits peer review\",\n        \"Whether catalytic lipase activity of SEC23IP contributes to membrane bridging is unresolved\",\n        \"Structural model of the tripartite Sec23–p125A–Sec31 interface on membranes not available\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The catalytic status of SEC23IP's lipase-homology domain (active enzyme vs. structural lipid-binding domain) and the full spectrum of cargo selectively dependent on SEC23IP-mediated COPII outer coat stabilization remain to be defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct measurement of SEC23IP lipase activity on physiological substrates\",\n        \"Cargo selectivity beyond procollagen and cholesterol not systematically profiled\",\n        \"High-resolution structure of SEC23IP in complex with COPII subunits lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3, 4, 7, 8]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [4, 7, 8]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"complexes\": [\n      \"Sec13/Sec31A/p125A heterohexamer\",\n      \"COPII coat\"\n    ],\n    \"partners\": [\n      \"SEC23A\",\n      \"SEC31A\",\n      \"SEC13\",\n      \"VPS13B\",\n      \"YWHAG\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SEC23IP (p125A) is a COPII accessory protein that organizes ER exit sites and facilitates ER-to-Golgi transport, with particular importance for large cargo secretion and acrosome biogenesis. It binds Sec23 via an N-terminal proline-rich region and Sec31 via a central domain (residues 260–600), forming preassembled Sec13/Sec31A/SEC23IP heterohexamers that promote outer COPII coat assembly, while simultaneously engaging PI4P-containing acceptor membranes to stabilize donor–acceptor membrane apposition required for tunnel-based collagen transport [PMID:10400679, PMID:20679433, PMID:40463098]. SEC23IP also functions as an adaptor for VPS13B/COH1 at the ERES–ERGIC interface, and loss of this interaction blocks tubular ERGIC formation and delays procollagen export, linking it mechanistically to Cohen syndrome pathology [PMID:39352497]. Knockout mice reveal an essential in vivo role in acrosome formation during spermiogenesis, with males producing round-headed, acrosome-less sperm and exhibiting subfertility [PMID:21640725].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"The discovery of p125 as a novel Sec23-interacting protein distinct from Sec24 established that mammalian COPII vesicle formation involves additional regulatory partners beyond the conserved yeast components.\",\n      \"evidence\": \"GST-Sec23p pulldown from mammalian cells, yeast two-hybrid confirmation of proline-rich region binding, overexpression phenotype disrupting ERGIC/Golgi\",\n      \"pmids\": [\"10400679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous lipase activity of p125 not determined\", \"Binding stoichiometry with Sec23 unknown\", \"No loss-of-function data\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Characterization of a p125 paralog (KIAA0725p) with phospholipase A1 activity but lacking the Sec23-binding region showed that the lipase homology domain and COPII-binding functions are separable, raising the question of whether p125 itself possesses enzymatic activity.\",\n      \"evidence\": \"In vitro phospholipase A1 assay on paralog, in vitro binding showing paralog does not bind Sec23p\",\n      \"pmids\": [\"11788596\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether p125 retains catalytic lipase activity remains untested in this study\", \"Functional redundancy between p125 and paralog unexplored\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Localization of p125 to ER exit sites by electron microscopy and demonstration that its depletion disorganizes ERES and cis-Golgi architecture established p125 as a structural organizer of COPII budding sites, rather than merely a Sec23 binding partner.\",\n      \"evidence\": \"Immunofluorescence and electron microscopy localization, chimeric domain-swap analysis, RNAi knockdown with organelle morphology readout\",\n      \"pmids\": [\"15623529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which p125 organizes ERES not resolved\", \"Whether cargo export is affected remained unclear at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The finding that p125A binds Sec31A (residues 260–600) and exists as preassembled cytosolic Sec13/Sec31A/p125A heterohexamers revealed that p125A is an integral component of the outer COPII coat complex, not merely a Sec23 accessory factor.\",\n      \"evidence\": \"Co-immunoprecipitation, gel filtration, immunodepletion of cytosolic complexes, RNAi with ER export and Golgi morphology readouts\",\n      \"pmids\": [\"20679433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ternary complex unknown\", \"Whether p125A binding to Sec31 and Sec23 is simultaneous or sequential was unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Knockout mice demonstrated that Sec23ip is dispensable for general viability but essential for acrosome biogenesis during spermiogenesis, revealing a specialized in vivo cargo-trafficking role.\",\n      \"evidence\": \"Gene knockout mouse model with histological and morphological sperm analysis\",\n      \"pmids\": [\"21640725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific cargo trafficking step in acrosome biogenesis requires Sec23ip is unknown\", \"Whether other specialized secretory tissues are affected remains unexplored\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of Sec23ip in the 14-3-3γ interactome of Leydig cells and its requirement for cholesterol mobilization during steroidogenesis extended its trafficking roles beyond canonical ER-to-Golgi transport.\",\n      \"evidence\": \"LC-MS co-IP proteomics with 14-3-3γ, siRNA knockdown with steroidogenesis and cholesterol trafficking assays in MA-10 cells\",\n      \"pmids\": [\"31875919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between Sec23ip and 14-3-3γ not validated by reciprocal methods\", \"Mechanism of cholesterol trafficking contribution uncharacterized\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The identification of SEC23IP as the ERES adaptor for VPS13B/COH1 bridged COPII vesicle budding to lipid transfer-dependent ERGIC tubule formation, and disease mutations in VPS13B-VAB that disrupt this interaction explained a molecular basis for procollagen export defects relevant to Cohen syndrome.\",\n      \"evidence\": \"Co-immunoprecipitation of direct VPS13B–SEC23IP interaction, knockout cell lines with live imaging of ERGIC tubules, procollagen ER export assay, disease mutation analysis\",\n      \"pmids\": [\"39352497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SEC23IP–VPS13B interaction is sufficient for tubule formation or requires additional factors is unknown\", \"In vivo confirmation in animal models lacking\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cell-free reconstitution demonstrated that p125A simultaneously binds PI4P, Sec31, and Sec23 to tether donor (ERES) and acceptor (ERGIC/cis-Golgi) membranes, providing the first mechanistic explanation for how outer COPII coat assembly is coupled to tunnel-based transport of fibrillar collagens.\",\n      \"evidence\": \"Cell-free membrane reconstitution, COPII coat assembly and PI4P-binding assays, chimeric domain swaps, KO cell transcriptomics and secretome mass spectrometry (preprint)\",\n      \"pmids\": [\"40463098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint awaiting peer review\", \"Structural basis of simultaneous tripartite binding unresolved\", \"Whether PI4P binding is essential in vivo not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether SEC23IP possesses intrinsic lipase activity, the atomic structure of the SEC23IP–Sec23–Sec31 ternary complex, and the precise cargo repertoire beyond collagens that depends on SEC23IP-mediated membrane tethering.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure available\", \"Catalytic competence of the lipase homology domain untested for p125 itself\", \"Full spectrum of SEC23IP-dependent cargoes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 4, 7, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3, 4, 7, 8]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"complexes\": [\"COPII outer coat (Sec13/Sec31A/p125A)\"],\n    \"partners\": [\"SEC23A\", \"SEC31A\", \"SEC13\", \"VPS13B\"],\n    \"other_free_text\": []\n  }\n}\n```"}