{"gene":"LNPEP","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1996,"finding":"Human placental leucine aminopeptidase (P-LAP/LNPEP) was cloned and characterized as a type II integral membrane zinc metallopeptidase containing the HEXXH consensus zinc-binding motif, capable of degrading peptide hormones such as oxytocin and vasopressin, and shown to be synthesized as an integral membrane protein that can be released into blood under physiological conditions.","method":"cDNA cloning, peptide sequencing of purified protein, Northern blot analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical characterization with protein sequencing confirming cDNA-deduced sequence, replicated in subsequent studies","pmids":["8550619"],"is_preprint":false},{"year":2000,"finding":"Tankyrase, a poly(ADP-ribose) polymerase, was identified as a binding partner of IRAP (insulin-responsive aminopeptidase/LNPEP). The interaction involves the ankyrin repeats of tankyrase and a defined sequence (96RQSPDG101) in the IRAP cytoplasmic domain. Tankyrase co-localizes with GLUT4 storage vesicles and IRAP in the juxtanuclear region of adipocytes, and is a substrate for MAPK phosphorylation upon insulin stimulation.","method":"Subcellular fractionation, immunofluorescence colocalization, specific binding assay, yeast two-hybrid, domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-localization with domain-level binding site identification, multiple orthogonal methods","pmids":["10988299"],"is_preprint":false},{"year":2001,"finding":"The angiotensin AT4 receptor was identified as IRAP (insulin-regulated aminopeptidase/LNPEP) by protein purification and peptide sequencing. HEK293T cells transfected with IRAP exhibit typical AT4 receptor binding characteristics, and AT4 receptor ligands (angiotensin IV, LVV-hemorphin 7) dose-dependently inhibit IRAP catalytic activity, suggesting they act by inhibiting IRAP-mediated cleavage of neuropeptide substrates.","method":"Protein purification, peptide sequencing, radioligand binding in transfected cells, enzyme activity inhibition assays, immunohistochemistry and in situ hybridization for brain distribution","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — protein purification and direct sequencing identifying IRAP as AT4 receptor, supported by functional transfection and binding assays","pmids":["11707427"],"is_preprint":false},{"year":2001,"finding":"In GLUT4-null mice, IRAP exhibited abnormal subcellular distribution and impaired insulin-stimulated translocation; in adipocytes lacking GLUT4, the compartment containing IRAP traffics constitutively to the cell surface, demonstrating that IRAP and GLUT4 are co-dependent in their vesicular trafficking and that GLUT4 is required for proper intracellular retention of IRAP.","method":"Western blot analysis of GLUT4 null mouse tissues (adipocytes, skeletal muscle, heart), subcellular fractionation, immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — clean genetic KO with defined trafficking phenotype, single lab","pmids":["11394912"],"is_preprint":false},{"year":2002,"finding":"A novel RXXPDG motif shared by IRAP, TAB182, and human TRF1 mediates their binding to tankyrase ankyrin repeat domains. Mutation of this motif abrogates tankyrase binding, establishing this hexapeptide as the core tankyrase-recognition sequence in IRAP's cytoplasmic domain.","method":"Yeast two-hybrid, in vitro binding assays with domain truncations and motif mutations","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of defined binding motif combined with binding assays, confirmed by Tankyrase crystal structures","pmids":["12080061"],"is_preprint":false},{"year":2003,"finding":"AT4 receptor ligands including angiotensin IV, Nle1-Ang IV, divalinal-Ang IV, and LVV-hemorphin-7 are potent competitive inhibitors of IRAP catalytic activity, binding to the catalytic site; vasopressin, oxytocin, and met-enkephalin were identified as rapid substrates for IRAP cleavage.","method":"Recombinant human IRAP enzyme activity assay, competitive kinetics analysis, radioligand displacement from IRAP-HEK293T membranes","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzyme assay with competitive kinetics and mutagenesis-independent but rigorous substrate/inhibitor characterization","pmids":["12871575"],"is_preprint":false},{"year":2005,"finding":"p115, a peripheral membrane protein involved in membrane trafficking, was identified as a binding partner of the IRAP cytoplasmic domain (residues 1-109). p115 partially co-localizes with GLUT4 and IRAP in the perinuclear region of adipocytes. Overexpression of the N-terminal p115 construct completely inhibited insulin-stimulated GLUT4 translocation, while having no effect on GLUT1 distribution, establishing a specific role for p115 in GLUT4/IRAP vesicle tethering.","method":"Affinity pull-down with IRAP cytoplasmic domain, immunofluorescence colocalization, overexpression dominant-negative in murine adipocytes","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — pull-down identification plus functional overexpression phenotype, single lab","pmids":["15800058"],"is_preprint":false},{"year":2005,"finding":"LNPEP/IRAP and related enzymes P-LAP and L-RAP constitute the 'Oxytocinase subfamily' of M1 aminopeptidases, sharing HEXXH(X)18E zinc-binding and GAMEN motifs essential for enzymatic activity. P-LAP/LNPEP translocates from intracellular vesicles to plasma membrane in a stimulus-dependent manner, unlike ER-retained subfamily members, and plays roles in pregnancy homeostasis, memory retention, blood pressure regulation, and antigen presentation.","method":"Biochemical characterization, sequence analysis, subcellular localization studies","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — synthesis of multiple biochemical studies establishing subfamily features, moderate evidence","pmids":["16054015"],"is_preprint":false},{"year":2007,"finding":"Vasopressin was identified as the first confirmed physiological substrate for IRAP in vivo. IRAP-deficient mice failed to process vasopressin from its N-terminus in adipocytes and skeletal muscle, vasopressin exhibited a threefold increased plasma half-life in IRAP-/- mice, and endogenous plasma vasopressin was elevated twofold. Insulin increased vasopressin clearance from control but not IRAP-/- mice, revealing a novel IRAP-dependent insulin effect on vasopressin metabolism.","method":"IRAP knockout mouse model, ex vivo cleavage assays in isolated adipocytes and skeletal muscle, in vivo vasopressin injection and plasma half-life measurement, ELISA for plasma and brain vasopressin levels","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1–2 — genetic KO with multiple orthogonal in vivo and ex vivo readouts, strong mechanistic evidence","pmids":["17684103"],"is_preprint":false},{"year":2007,"finding":"IRAP is required for insulin-stimulated GLUT4 storage vesicle (GSV) translocation: IRAP knockdown impaired insulin-stimulated GLUT4 translocation without affecting GLUT4 expression, while GLUT4 knockdown did not impair IRAP translocation. Tankyrase knockdown attenuated insulin-stimulated GSV translocation and glucose uptake without disrupting insulin-induced phosphorylation cascades, and tankyrase knockdown altered basal-state endosomal partitioning of GLUT4 and IRAP; these effects were reproduced by a general PARP inhibitor.","method":"siRNA knockdown in 3T3-L1 adipocytes, insulin-stimulated translocation assays, glucose uptake assays, iodixanol density gradient fractionation, PARP inhibitor (PJ34) treatment","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal knockdown experiments with multiple functional readouts, pharmacological validation, single lab but multiple orthogonal approaches","pmids":["17059388"],"is_preprint":false},{"year":2009,"finding":"IRAP was localized to a Rab14+ endosomal storage compartment in human dendritic cells where it interacted with MHC class I molecules. IRAP deficiency compromised cross-presentation of exogenous antigens in vitro and in vivo by impairing N-terminal peptide trimming in this endosomal compartment, without affecting endogenous presentation, establishing IRAP as a component of the MHC class I cross-presentation pathway.","method":"Immunofluorescence localization, co-immunoprecipitation of IRAP with MHC class I, IRAP-deficient dendritic cell cross-presentation assays in vitro and in vivo","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — genetic deficiency with specific in vitro and in vivo functional readouts, co-IP for complex identification, published in high-impact journal","pmids":["19498108"],"is_preprint":false},{"year":2009,"finding":"Cross-presentation in inflammatory monocyte-derived dendritic cells (moDC) requires IRAP, while steady-state CD8+ DCs use an IRAP-independent pathway for cross-priming. IRAP and mannose receptor are dispensable for cross-presentation by CD8+ DCs, and no diversion of endocytosed antigen into IRAP-containing endosomes was detected in these cells, demonstrating mechanistic differences between DC subsets.","method":"IRAP-deficient and mannose receptor-deficient DC cross-presentation assays, antigen trafficking experiments, in vivo cross-priming assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic deficiency in two DC populations with parallel functional assays, in vivo validation","pmids":["19918052"],"is_preprint":false},{"year":2009,"finding":"IRAP knockout mice showed normal reproductive profiles (gestational period, litter size, parturition), and IRAP was undetectable in pregnant mouse serum. The cleavage site (Phe154-Ala155) required to release soluble IRAP is restricted to members of the hominidae family, explaining the absence of circulating IRAP in mice during pregnancy and indicating species-specific regulation of IRAP shedding.","method":"IRAP knockout mouse phenotypic analysis, Western blot of pregnant mouse serum, fluorimetric IRAP enzyme assay, sequence comparison across species","journal":"Peptides","confidence":"Medium","confidence_rationale":"Tier 2 — KO phenotyping with biochemical assays, single lab","pmids":["19647771"],"is_preprint":false},{"year":2011,"finding":"Vimentin was identified as a cytoplasmic domain-binding partner of IRAP using pull-down assays and co-immunoprecipitation in 3T3-L1 adipocytes. Depletion of vimentin decreased insulin-stimulated GLUT4 translocation to the plasma membrane, suggesting vimentin tethers GLUT4 storage vesicles to the cytoskeleton through its interaction with IRAP.","method":"IRAP cytoplasmic domain pull-down, co-immunoprecipitation in 3T3-L1 adipocytes, vimentin siRNA knockdown with GLUT4 translocation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — pull-down and co-IP with functional KD phenotype, single lab","pmids":["21216232"],"is_preprint":false},{"year":2012,"finding":"In steady-state conventional dendritic cells (cDCs), IRAP co-localizes with Rab14 and Syntaxin 6 in regulated endosomal storage compartments, and IRAP deficiency compromises cross-presentation of both soluble and particulate antigens. IRAP recruitment to phagosomes was stronger in CD8+ DCs, contributing to their superior cross-presentation efficacy.","method":"Immunofluorescence colocalization, IRAP-deficient DC cross-presentation assays for soluble and particulate antigens","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic deficiency with multiple antigen types and DC subsets, replicates and extends Science 2009 paper","pmids":["22238454"],"is_preprint":false},{"year":2013,"finding":"A missense variant rs2303138 (p.Ala763Thr) in LNPEP was associated with psoriasis susceptibility. LNPEP was significantly downregulated in psoriatic lesions, and pathway analysis indicated LNPEP involvement in the renin-angiotensin system, suggesting its role in connecting cardiovascular/metabolic pathways to inflammatory skin disease.","method":"GWAS with replication cohorts (total >18,000 subjects), expression analysis of LNPEP in psoriatic vs. control skin","journal":"The Journal of investigative dermatology","confidence":"Low","confidence_rationale":"Tier 4 — primarily genetic association with expression correlation; no direct mechanistic experiment on the variant's effect on LNPEP function","pmids":["23897274"],"is_preprint":false},{"year":2015,"finding":"Approximately 60% of IRAP is S-acylated in 3T3-L1 adipocytes. Site-directed mutagenesis mapped S-acylation to two cytoplasmic cysteine residues, one within the cytoplasmic side of the transmembrane domain and one just upstream; results suggest these cysteines are modified in a mutually exclusive manner. However, mutation of these cysteines did not affect plasma membrane localization in HEK293T cells, indicating S-acylation is not essential for trafficking through the secretory pathway.","method":"Semi-quantitative acyl-RAC technique, site-directed mutagenesis of cysteine residues, plasma membrane localization assay in HEK293T cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–2 — biochemical acylation quantification plus mutagenesis identifying modified residues, single lab","pmids":["26198666"],"is_preprint":false},{"year":2017,"finding":"27-Hydroxycholesterol (27-OH) increased the levels and activity of IRAP in the brain, countered IRAP antagonist angiotensin IV (AngIV)-mediated glucose uptake, and enhanced levels of aminopeptidase N (AP-N). These effects were mediated by liver X receptors, revealing a molecular link between cholesterol metabolism, IRAP activity, and neuronal glucose uptake via the GLUT4/IRAP system.","method":"In vivo brain glucose PET imaging, GLUT4/IRAP expression analysis, AngIV treatment in IRAP-modulated cells, liver X receptor pathway analysis","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and cell-based mechanistic studies linking 27-OH/LXR to IRAP regulation, multiple methods","pmids":["28213512"],"is_preprint":false},{"year":2020,"finding":"LNPEP/IRAP is proposed as the evolutionary progenitor of the ERAP1/ERAP2/LNPEP gene cluster on chromosome 5, from which ERAP1 and ERAP2 may have derived by gene duplication. LNPEP's functions include regulation of the renin-angiotensin system (at cell membrane as AT4/angiotensin IV receptor) and contribution to antigen cross-presentation in endosomal vesicles; its role in antigen presentation is thought to be evolutionarily acquired later than its vasoregulatory function.","method":"Comparative genomic/evolutionary sequence analysis, review of functional biochemical data","journal":"Frontiers in immunology","confidence":"Low","confidence_rationale":"Tier 4 — primarily computational evolutionary analysis with functional synthesis from prior studies","pmids":["32793222"],"is_preprint":false},{"year":2020,"finding":"Upon TCR ligation, the TCR-CD3ζ complex undergoes clathrin-mediated internalization while maintaining CD3ζ signalling from endosomal vesicles containing IRAP and the SNARE protein Syntaxin 6. IRAP deletion destabilized this compartment, enhanced plasma membrane TCR-CD3ζ expression but compromised overall CD3ζ signalling. Mice with T cell-specific IRAP deletion failed to develop efficient polyclonal anti-tumour responses, establishing IRAP-dependent endosomal TCR signalling as essential for T cell activation.","method":"IRAP conditional knockout in T cells, TCR internalization assays, CD3ζ signalling analysis (phosphorylation), immunofluorescence colocalization of TCR-CD3ζ with IRAP/Syntaxin 6 endosomes, in vivo anti-tumour response assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple mechanistic readouts (signalling, localization, in vivo function), published in high-impact journal","pmids":["32487999"],"is_preprint":false}],"current_model":"LNPEP (IRAP) is a type II transmembrane zinc metallopeptidase (M1 family, oxytocinase subfamily) that resides in intracellular GLUT4 storage vesicles and IRAP+/Rab14+/Syntaxin-6+ endosomes in adipocytes, myocytes, dendritic cells, and T cells; it traffics to the plasma membrane in response to insulin (where it cleaves neuropeptides including vasopressin and oxytocin), serves as the angiotensin IV (AT4) receptor whose ligands competitively inhibit its catalytic site, facilitates GLUT4 vesicle exocytosis through cytoplasmic domain interactions with tankyrase (via RXXPDG motif), p115, and vimentin, mediates MHC class I cross-presentation by trimming peptides in endosomal compartments of dendritic cells, and maintains endosomal TCR-CD3ζ signalling required for T cell activation."},"narrative":{"teleology":[{"year":1996,"claim":"Cloning of LNPEP established it as a type II integral membrane zinc metallopeptidase capable of degrading oxytocin and vasopressin, resolving the molecular identity of placental leucine aminopeptidase.","evidence":"cDNA cloning and peptide sequencing of purified human placental protein","pmids":["8550619"],"confidence":"High","gaps":["No in vivo substrates confirmed","Subcellular trafficking unknown","Physiological function beyond pregnancy not addressed"]},{"year":2001,"claim":"Identification of IRAP as the angiotensin AT4 receptor revealed that AT4 ligands such as angiotensin IV act by competitively inhibiting IRAP catalytic activity rather than signaling through a classical GPCR, reframing the AT4 receptor pharmacology as enzyme inhibition.","evidence":"Protein purification and peptide sequencing from bovine adrenal membranes; radioligand binding and enzyme inhibition assays in IRAP-transfected HEK293T cells","pmids":["11707427","12871575"],"confidence":"High","gaps":["Whether AT4-mediated cognitive effects are fully explained by IRAP inhibition vs. other mechanisms","Structural basis of competitive inhibition not yet resolved"]},{"year":2001,"claim":"Studies in GLUT4-null mice demonstrated that IRAP and GLUT4 are co-dependent in vesicular trafficking: loss of GLUT4 caused constitutive surface appearance of IRAP, establishing their mutual retention in an insulin-responsive intracellular compartment.","evidence":"Subcellular fractionation and immunofluorescence in GLUT4 knockout mouse adipocytes","pmids":["11394912"],"confidence":"Medium","gaps":["Whether IRAP itself provides retention signals for the compartment","Mechanism of constitutive translocation in GLUT4-null cells"]},{"year":2002,"claim":"Mapping the RXXPDG tankyrase-binding motif in IRAP's cytoplasmic domain, and subsequent identification of p115 and vimentin as additional cytoplasmic domain partners, defined a molecular machinery through which IRAP coordinates GLUT4 storage vesicle tethering and insulin-stimulated exocytosis.","evidence":"Yeast two-hybrid, mutagenesis of RXXPDG motif, pull-down/co-IP in 3T3-L1 adipocytes, siRNA knockdown of tankyrase/vimentin with GLUT4 translocation and glucose uptake readouts","pmids":["12080061","10988299","15800058","17059388","21216232"],"confidence":"High","gaps":["Whether tankyrase poly(ADP-ribosyl)ation of IRAP or a cargo protein is the functional output","How p115 and vimentin interactions are coordinated temporally during insulin signaling"]},{"year":2007,"claim":"IRAP knockout mice revealed vasopressin as the first confirmed in vivo substrate, with elevated plasma vasopressin and prolonged half-life in null animals, and demonstrated that insulin accelerates vasopressin clearance through IRAP, linking insulin-stimulated IRAP surface translocation to neuropeptide metabolism.","evidence":"IRAP knockout mice, ex vivo adipocyte/muscle cleavage assays, in vivo plasma vasopressin half-life measurements","pmids":["17684103"],"confidence":"High","gaps":["Whether oxytocin is similarly regulated in vivo","Contribution of IRAP vs. other peptidases to systemic neuropeptide clearance"]},{"year":2009,"claim":"Discovery that IRAP localizes to Rab14⁺ endosomes in dendritic cells and is required for MHC class I cross-presentation opened an entirely new functional axis—endosomal peptide trimming for antigen presentation—distinct from its metabolic and vasoregulatory roles.","evidence":"IRAP-deficient dendritic cells, co-IP with MHC class I, in vitro and in vivo cross-presentation assays; DC subset comparisons showing IRAP-dependent and -independent cross-presentation pathways","pmids":["19498108","19918052","22238454"],"confidence":"High","gaps":["Full repertoire of peptides trimmed by IRAP in endosomes","Whether IRAP enzymatic activity vs. scaffolding function is required for cross-presentation","Relationship between IRAP and ERAP1/2 in antigen processing"]},{"year":2020,"claim":"Conditional T cell–specific IRAP deletion revealed that IRAP maintains an endosomal compartment (marked by Syntaxin 6) essential for sustained TCR-CD3ζ signaling after receptor internalization, with loss of IRAP enhancing surface TCR levels but paradoxically impairing signaling output and anti-tumour immunity.","evidence":"T cell–conditional IRAP knockout, TCR internalization and CD3ζ phosphorylation assays, colocalization with Syntaxin 6 endosomes, in vivo tumour challenge","pmids":["32487999"],"confidence":"High","gaps":["Whether IRAP enzymatic activity or its role as a compartment organizer drives TCR signaling maintenance","Applicability to other immune synapse contexts beyond tumour immunity","Potential redundancy with ERAP1/2 in T cell endosomes"]},{"year":null,"claim":"Key unresolved questions include whether IRAP's catalytic activity versus its structural/trafficking role is the primary driver in cross-presentation and TCR signaling, the structural basis of AT4 ligand competitive inhibition, and how IRAP's three major functional axes—metabolic vesicle trafficking, antigen presentation, and endosomal TCR signaling—are coordinated or independently regulated across cell types.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of full-length IRAP with bound AT4 ligand","Enzymatic vs. scaffolding contribution not separated by catalytic-dead mutants in immune contexts","Physiological relevance of S-acylation to IRAP trafficking in insulin-responsive tissues unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,5,7,8,10]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,5,8]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,3,6,9,10,14,19]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[10,14,19]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,8,16]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,11,14,19]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,6,9,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5,17]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,5,7,8]}],"complexes":["GLUT4 storage vesicle complex"],"partners":["TNKS","GM130","VIM","SLC2A4","STX6","RAB14"],"other_free_text":[]},"mechanistic_narrative":"LNPEP (IRAP/oxytocinase) is a type II transmembrane zinc metallopeptidase of the M1 aminopeptidase family that cleaves neuropeptide substrates—most notably vasopressin and oxytocin—at the cell surface and functions as the angiotensin IV (AT4) receptor, whose ligands act as competitive inhibitors of its catalytic site [PMID:8550619, PMID:11707427, PMID:12871575, PMID:17684103]. LNPEP resides on insulin-responsive GLUT4 storage vesicles and is required for their insulin-stimulated translocation to the plasma membrane, engaging cytoplasmic domain partners including tankyrase (via an RXXPDG motif), p115, and vimentin to coordinate vesicle tethering and exocytosis [PMID:10988299, PMID:12080061, PMID:15800058, PMID:17059388, PMID:21216232]. In dendritic cells, LNPEP localizes to Rab14⁺/Syntaxin-6⁺ endosomes where it trims peptides for MHC class I cross-presentation of exogenous antigens [PMID:19498108, PMID:22238454]. In T cells, LNPEP maintains endosomal TCR-CD3ζ signaling after clathrin-mediated internalization, and T cell–specific deletion impairs polyclonal anti-tumour immunity [PMID:32487999]."},"prefetch_data":{"uniprot":{"accession":"Q9UIQ6","full_name":"Leucyl-cystinyl aminopeptidase","aliases":["Insulin-regulated membrane aminopeptidase","Insulin-responsive aminopeptidase","IRAP","Oxytocinase","OTase","Placental leucine aminopeptidase","P-LAP"],"length_aa":1025,"mass_kda":117.3,"function":"Release of an N-terminal amino acid, cleaves before cysteine, leucine as well as other amino acids. Degrades peptide hormones such as oxytocin, vasopressin and angiotensin III, and plays a role in maintaining homeostasis during pregnancy. May be involved in the inactivation of neuronal peptides in the brain. Cleaves Met-enkephalin and dynorphin. Binds angiotensin IV and may be the angiotensin IV receptor in the brain","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9UIQ6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LNPEP","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LNPEP","total_profiled":1310},"omim":[{"mim_id":"612465","title":"TBC1 DOMAIN FAMILY, MEMBER 4; TBC1D4","url":"https://www.omim.org/entry/612465"},{"mim_id":"610466","title":"LIMB- AND CNS-EXPRESSED GENE 1; LIX1","url":"https://www.omim.org/entry/610466"},{"mim_id":"610046","title":"LAEVERIN; LVRN","url":"https://www.omim.org/entry/610046"},{"mim_id":"609497","title":"ENDOPLASMIC RETICULUM AMINOPEPTIDASE 2; ERAP2","url":"https://www.omim.org/entry/609497"},{"mim_id":"609414","title":"PHOSPHOINOSITIDE KINASE, FYVE FINGER-CONTAINING; PIKFYVE","url":"https://www.omim.org/entry/609414"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LNPEP"},"hgnc":{"alias_symbol":["CAP","PLAP","P-LAP","IRAP"],"prev_symbol":[]},"alphafold":{"accession":"Q9UIQ6","domains":[{"cath_id":"2.60.40.1730","chopping":"155-366","consensus_level":"medium","plddt":97.1151,"start":155,"end":366},{"cath_id":"1.10.390.10","chopping":"476-613","consensus_level":"medium","plddt":97.3842,"start":476,"end":613},{"cath_id":"-","chopping":"839-900","consensus_level":"medium","plddt":97.7416,"start":839,"end":900},{"cath_id":"1.25.50.20","chopping":"901-1025","consensus_level":"medium","plddt":97.1761,"start":901,"end":1025}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIQ6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIQ6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIQ6-F1-predicted_aligned_error_v6.png","plddt_mean":88.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LNPEP","jax_strain_url":"https://www.jax.org/strain/search?query=LNPEP"},"sequence":{"accession":"Q9UIQ6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UIQ6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UIQ6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIQ6"}},"corpus_meta":[{"pmid":"10550204","id":"PMC_10550204","title":"Transcription activation by catabolite activator protein (CAP).","date":"1999","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10550204","citation_count":654,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"2208274","id":"PMC_2208274","title":"Monomethylated cap structures facilitate RNA export from the nucleus.","date":"1990","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/2208274","citation_count":355,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11287428","id":"PMC_11287428","title":"Ceramide enables fas to cap and kill.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11287428","citation_count":313,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17996713","id":"PMC_17996713","title":"A hypoxia-controlled cap-dependent to cap-independent translation switch in breast cancer.","date":"2007","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/17996713","citation_count":253,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10988299","id":"PMC_10988299","title":"Tankyrase is a golgi-associated mitogen-activated protein kinase substrate that interacts with IRAP in GLUT4 vesicles.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10988299","citation_count":241,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15145049","id":"PMC_15145049","title":"Cap-dependent and cap-independent translation in eukaryotic systems.","date":"2004","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/15145049","citation_count":205,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26460318","id":"PMC_26460318","title":"Discovery of m(7)G-cap in eukaryotic mRNAs.","date":"2015","source":"Proceedings of the Japan Academy. 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Tankyrase co-localizes with GLUT4 storage vesicles in adipocytes and is a peripheral membrane protein associated with the Golgi.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, co-localization, specific binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assays with defined domain mapping, replicated by subsequent work\",\n      \"pmids\": [\"10988299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A conserved RXXPDG motif in the IRAP (LNPEP) cytosolic domain mediates binding to tankyrase-1 and tankyrase-2 ankyrin-repeat domains; this same motif is shared by TAB182 and human TRF1 and mediates their tankyrase interactions.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding assays, mutagenesis of the RXXPDG motif\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of defined motif confirmed in multiple binding assays\",\n      \"pmids\": [\"12080061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p115, a peripheral membrane protein involved in membrane trafficking, binds to the N-terminal cytoplasmic domain (residues 1-109) of IRAP (LNPEP). Overexpression of the p115 N-terminus, which co-localizes with GLUT4 throughout the cell, completely inhibits insulin-stimulated GLUT4 translocation, indicating p115 has a specific role in tethering insulin-sensitive GLUT4 vesicles at an intracellular site.\",\n      \"method\": \"Affinity pulldown with IRAP cytoplasmic domain, immunofluorescence co-localization, overexpression dominant-negative experiment, fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pulldown identification plus functional dominant-negative with specific phenotypic readout\",\n      \"pmids\": [\"15800058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Vasopressin is a physiological in vivo substrate for IRAP (LNPEP) aminopeptidase activity. IRAP-deficient adipocytes and skeletal muscles fail to cleave vasopressin from the N-terminus; vasopressin half-life is threefold increased in IRAP-/- mice, and endogenous plasma vasopressin levels are elevated twofold. Insulin increases vasopressin clearance in control but not IRAP-/- mice, demonstrating that insulin-stimulated IRAP translocation to the cell surface mediates acute vasopressin degradation.\",\n      \"method\": \"IRAP knockout mouse model, ex vivo aminopeptidase cleavage assays, in vivo vasopressin injection, plasma vasopressin ELISA, fluorimetric enzyme assays\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockout mouse with multiple orthogonal in vivo and ex vivo measurements\",\n      \"pmids\": [\"17684103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IRAP (LNPEP) plays a role in GLUT4 storage vesicle (GSV) trafficking: siRNA knockdown of IRAP impairs insulin-stimulated GLUT4 translocation and glucose uptake in 3T3-L1 adipocytes. Tankyrase knockdown similarly attenuates GSV translocation and alters basal-state partitioning of GLUT4 and IRAP within endosomal compartments, an effect reproduced by PARP inhibitor PJ34, indicating tankyrase PARP activity regulates GSV trafficking.\",\n      \"method\": \"siRNA knockdown in 3T3-L1 adipocytes, GLUT4 translocation assay, glucose uptake assay, iodixanol density gradient fractionation, PARP inhibitor treatment\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with multiple orthogonal readouts and pharmacological validation\",\n      \"pmids\": [\"17059388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In GLUT4-null adipocytes, IRAP (LNPEP) exhibits abnormal subcellular distribution and impaired insulin-stimulated translocation. IRAP is upregulated in GLUT4-null adipocytes and redistributes constitutively to the plasma membrane, indicating that GLUT4 is required for proper intracellular retention of IRAP-containing vesicles.\",\n      \"method\": \"GLUT4 knockout mouse, Western blot, subcellular fractionation, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with defined subcellular localization phenotype; single lab\",\n      \"pmids\": [\"11394912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IRAP (LNPEP) is identified as the AT4 receptor (angiotensin IV receptor). Ligands including cyclic angiotensin IV analogues inhibit IRAP's enzymatic (aminopeptidase) activity by binding to its active site. IRAP belongs to the M1 family of zinc-dependent metallopeptidases (EC 3.4.11.3), and its inhibition is proposed to mediate the physiological effects of AT4 receptor ligands.\",\n      \"method\": \"Enzyme inhibition assays with recombinant human IRAP, structure-activity analysis of cyclic peptide ligands\",\n      \"journal\": \"Journal of peptide science : an official publication of the European Peptide Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro enzyme inhibition with multiple analogues; single lab\",\n      \"pmids\": [\"16967438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IRAP (LNPEP) is localized to an endosomal compartment marked by Rab14 and syntaxin 6 in conventional dendritic cells. IRAP deficiency compromises cross-presentation of soluble and particulate antigens by both CD8+ and CD8- conventional DCs, revealing that IRAP-containing endosomes mediate aminoterminal trimming of cross-presented peptides and are required for efficient cross-presentation.\",\n      \"method\": \"Immunofluorescence co-localization, IRAP-deficient dendritic cells, antigen cross-presentation assay with CD8+ T cell readout\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout/deficiency with specific functional cross-presentation phenotype and localization data; single lab\",\n      \"pmids\": [\"22238454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IRAP (LNPEP) is S-acylated in 3T3-L1 adipocytes; approximately 60% of IRAP is S-acylated. Site-directed mutagenesis mapped S-acylation to two cysteine residues, one in the cytoplasmic side of the transmembrane domain and one just upstream, which appear to be modified in a mutually exclusive manner. S-acylation does not detectably affect plasma membrane localization of IRAP in HEK293T cells.\",\n      \"method\": \"Semi-quantitative acyl-RAC technique, site-directed mutagenesis of cysteine residues, plasma membrane localization assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical acylation assay with mutagenesis; single lab, moderate evidence\",\n      \"pmids\": [\"26198666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Vimentin binds directly to the cytoplasmic domain of IRAP (LNPEP). siRNA-mediated depletion of vimentin in 3T3-L1 adipocytes decreases insulin-stimulated GLUT4 translocation to the plasma membrane, apparently by dispersing GLUT4 storage vesicles away from the cytoskeleton.\",\n      \"method\": \"Pull-down assay using IRAP cytoplasmic domain as bait, co-immunoprecipitation in 3T3-L1 adipocytes, siRNA knockdown, GLUT4 translocation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pulldown plus co-IP plus functional siRNA knockdown; single lab\",\n      \"pmids\": [\"21216232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"27-hydroxycholesterol (27-OH) increases IRAP (LNPEP) levels and activity in the brain, counteracting angiotensin IV (AngIV)-mediated glucose uptake and reducing GLUT4 expression, leading to impaired brain glucose metabolism and spatial memory. These effects are mediated through liver X receptors, linking cholesterol metabolism to IRAP-dependent GLUT4/IRAP trafficking.\",\n      \"method\": \"In vivo mouse model with 27-OH treatment, 18F-FDG brain uptake, IRAP enzyme activity assay, pharmacological AngIV treatment, LXR pathway analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo model with multiple mechanistic readouts; single lab\",\n      \"pmids\": [\"28213512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IRAP (LNPEP) defines a specialized endosomal compartment containing Syntaxin 6 that maintains TCR-CD3ζ signalling after TCR internalization via clathrin-mediated endocytosis. IRAP deletion enhances plasma membrane TCR-CD3ζ expression but compromises overall CD3ζ signalling and T cell activation; T cell-specific IRAP knockout mice fail to develop efficient anti-tumour responses, demonstrating that endosomal IRAP-dependent TCR signalling is essential for T cell function.\",\n      \"method\": \"IRAP knockout (global and T cell-specific), immunofluorescence co-localization with SNARE proteins, TCR internalization assay, CD3ζ phosphorylation assay, in vivo anti-tumour T cell response\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with multiple orthogonal mechanistic and functional readouts, in vitro and in vivo\",\n      \"pmids\": [\"32487999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IRAP (LNPEP) knockout mice show normal reproductive parameters (gestational period, litter size, parturition) and no detectable IRAP in maternal serum during pregnancy, because the cleavage site (Phe154-Ala155) for secretase-mediated release of soluble IRAP is restricted to hominidae, not rodents. Brain oxytocin-modulated maternal behavior is also unaltered in IRAP knockout mice.\",\n      \"method\": \"IRAP knockout mouse, Western blot of maternal serum, fluorimetric IRAP enzyme assay, maternal behavior tests\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout model with enzyme assay and sequence analysis; single lab\",\n      \"pmids\": [\"19647771\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LNPEP (IRAP) is a zinc-dependent M1-family transmembrane aminopeptidase that co-localizes with GLUT4 in intracellular storage vesicles and translocates to the plasma membrane upon insulin stimulation, where it degrades extracellular peptide hormones including vasopressin and oxytocin; its cytoplasmic domain anchors vesicle trafficking by binding partners including tankyrase (via the RXXPDG motif), p115, and vimentin; it defines a specialized IRAP+/Rab14+/Syntaxin-6+ endosomal compartment required for antigen cross-presentation in dendritic cells and for sustained endosomal TCR-CD3ζ signalling in T cells; and it also serves as the angiotensin IV (AT4) receptor whose enzymatic inhibition mediates angiotensin IV's physiological effects.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper and extract discoveries only from KEEP papers.\n\n**Classification of relevant papers for LNPEP (insulin-regulated aminopeptidase, IRAP, also known as placental leucine aminopeptidase/P-LAP):**\n\nKEEP papers (about LNPEP/IRAP canonical protein):\n- Corpus [5]: Tankyrase binds IRAP in GLUT4 vesicles\n- Corpus [14]: Tankyrase-binding motif RXXPDG in IRAP\n- Corpus [18]: IRAP/tankyrase role in GLUT4 exocytosis\n- Corpus [25]: Vasopressin as physiological IRAP substrate\n- Corpus [29]: p115 interacts with IRAP, role in GLUT4 translocation\n- Corpus [33]: 27-OH/IRAP/GLUT4 in neuronal glucose uptake\n- Corpus [36]: IRAP role in insulin action (review)\n- Corpus [43]: IRAP-Rab14 endosomes in cross-presentation\n- Corpus [46]: LNPEP missense variant in psoriasis\n- Corpus [56]: IRAP-dependent endosomal TCR signaling\n- Corpus [59]: Cyclic IRAP/AT4 receptor ligands\n- Corpus [60]: Multifaceted nature of ERAP1/ERAP2/LNPEP (evolutionary review)\n- Corpus [62]: GLUT4 ablation → IRAP redistribution\n- Corpus [72]: Ligands to IRAP/AT4 receptor\n- Corpus [82]: S-acylation of IRAP\n- Corpus [88]: Vimentin binds IRAP, GLUT4 vesicle trafficking\n- Corpus [98]: IRAP knockout mice reproductive/maternal behavior\n\nAdditional curated papers:\n- Curated [14]: AT4 receptor is IRAP (foundational)\n- Curated [18]: IRAP in MHC class I cross-presentation\n- Curated [19]: Leucine aminopeptidase in antigen processing (related but about LAP, not LNPEP specifically - EXCLUDE)\n- Curated [22]: Two proteases in MHC class I pathway (about puromycin-sensitive AP and bleomycin hydrolase - EXCLUDE)\n- Curated [24]: Human P-LAP/oxytocinase cloning and characterization (LNPEP/P-LAP)\n- Curated [25]: Lysosomal membrane proteins (EXCLUDE - general proteomics)\n- Curated [26]: AT4 ligands inhibit IRAP (KEEP)\n- Curated [27]: Oxytocinase subfamily M1 aminopeptidases (KEEP - about P-LAP/IRAP)\n- Curated [29]: Different cross-presentation pathways (IRAP in inflammatory DC - KEEP)\n- Curated [20]: Tankyrase structural basis (KEEP - includes IRAP binding motif)\n\nEXCLUDE papers (alias collisions - CAP = catabolite activator protein, cold atmospheric plasma, cyclase-associated protein, cap structures, mRNA cap, PLAP = placental alkaline phosphatase, IRAP = plant marker, T-cap/titin-cap, root cap, fibrous cap, etc.): All others.\n\nPaper [84] (circ-LNPEP): EXCLUDE - alt-locus product (circRNA).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Human placental leucine aminopeptidase (P-LAP/LNPEP) was cloned and characterized as a type II integral membrane zinc metallopeptidase containing the HEXXH consensus zinc-binding motif, capable of degrading peptide hormones such as oxytocin and vasopressin, and shown to be synthesized as an integral membrane protein that can be released into blood under physiological conditions.\",\n      \"method\": \"cDNA cloning, peptide sequencing of purified protein, Northern blot analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical characterization with protein sequencing confirming cDNA-deduced sequence, replicated in subsequent studies\",\n      \"pmids\": [\"8550619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Tankyrase, a poly(ADP-ribose) polymerase, was identified as a binding partner of IRAP (insulin-responsive aminopeptidase/LNPEP). The interaction involves the ankyrin repeats of tankyrase and a defined sequence (96RQSPDG101) in the IRAP cytoplasmic domain. Tankyrase co-localizes with GLUT4 storage vesicles and IRAP in the juxtanuclear region of adipocytes, and is a substrate for MAPK phosphorylation upon insulin stimulation.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence colocalization, specific binding assay, yeast two-hybrid, domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-localization with domain-level binding site identification, multiple orthogonal methods\",\n      \"pmids\": [\"10988299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The angiotensin AT4 receptor was identified as IRAP (insulin-regulated aminopeptidase/LNPEP) by protein purification and peptide sequencing. HEK293T cells transfected with IRAP exhibit typical AT4 receptor binding characteristics, and AT4 receptor ligands (angiotensin IV, LVV-hemorphin 7) dose-dependently inhibit IRAP catalytic activity, suggesting they act by inhibiting IRAP-mediated cleavage of neuropeptide substrates.\",\n      \"method\": \"Protein purification, peptide sequencing, radioligand binding in transfected cells, enzyme activity inhibition assays, immunohistochemistry and in situ hybridization for brain distribution\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — protein purification and direct sequencing identifying IRAP as AT4 receptor, supported by functional transfection and binding assays\",\n      \"pmids\": [\"11707427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In GLUT4-null mice, IRAP exhibited abnormal subcellular distribution and impaired insulin-stimulated translocation; in adipocytes lacking GLUT4, the compartment containing IRAP traffics constitutively to the cell surface, demonstrating that IRAP and GLUT4 are co-dependent in their vesicular trafficking and that GLUT4 is required for proper intracellular retention of IRAP.\",\n      \"method\": \"Western blot analysis of GLUT4 null mouse tissues (adipocytes, skeletal muscle, heart), subcellular fractionation, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with defined trafficking phenotype, single lab\",\n      \"pmids\": [\"11394912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A novel RXXPDG motif shared by IRAP, TAB182, and human TRF1 mediates their binding to tankyrase ankyrin repeat domains. Mutation of this motif abrogates tankyrase binding, establishing this hexapeptide as the core tankyrase-recognition sequence in IRAP's cytoplasmic domain.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assays with domain truncations and motif mutations\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of defined binding motif combined with binding assays, confirmed by Tankyrase crystal structures\",\n      \"pmids\": [\"12080061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AT4 receptor ligands including angiotensin IV, Nle1-Ang IV, divalinal-Ang IV, and LVV-hemorphin-7 are potent competitive inhibitors of IRAP catalytic activity, binding to the catalytic site; vasopressin, oxytocin, and met-enkephalin were identified as rapid substrates for IRAP cleavage.\",\n      \"method\": \"Recombinant human IRAP enzyme activity assay, competitive kinetics analysis, radioligand displacement from IRAP-HEK293T membranes\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzyme assay with competitive kinetics and mutagenesis-independent but rigorous substrate/inhibitor characterization\",\n      \"pmids\": [\"12871575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p115, a peripheral membrane protein involved in membrane trafficking, was identified as a binding partner of the IRAP cytoplasmic domain (residues 1-109). p115 partially co-localizes with GLUT4 and IRAP in the perinuclear region of adipocytes. Overexpression of the N-terminal p115 construct completely inhibited insulin-stimulated GLUT4 translocation, while having no effect on GLUT1 distribution, establishing a specific role for p115 in GLUT4/IRAP vesicle tethering.\",\n      \"method\": \"Affinity pull-down with IRAP cytoplasmic domain, immunofluorescence colocalization, overexpression dominant-negative in murine adipocytes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pull-down identification plus functional overexpression phenotype, single lab\",\n      \"pmids\": [\"15800058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"LNPEP/IRAP and related enzymes P-LAP and L-RAP constitute the 'Oxytocinase subfamily' of M1 aminopeptidases, sharing HEXXH(X)18E zinc-binding and GAMEN motifs essential for enzymatic activity. P-LAP/LNPEP translocates from intracellular vesicles to plasma membrane in a stimulus-dependent manner, unlike ER-retained subfamily members, and plays roles in pregnancy homeostasis, memory retention, blood pressure regulation, and antigen presentation.\",\n      \"method\": \"Biochemical characterization, sequence analysis, subcellular localization studies\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple biochemical studies establishing subfamily features, moderate evidence\",\n      \"pmids\": [\"16054015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Vasopressin was identified as the first confirmed physiological substrate for IRAP in vivo. IRAP-deficient mice failed to process vasopressin from its N-terminus in adipocytes and skeletal muscle, vasopressin exhibited a threefold increased plasma half-life in IRAP-/- mice, and endogenous plasma vasopressin was elevated twofold. Insulin increased vasopressin clearance from control but not IRAP-/- mice, revealing a novel IRAP-dependent insulin effect on vasopressin metabolism.\",\n      \"method\": \"IRAP knockout mouse model, ex vivo cleavage assays in isolated adipocytes and skeletal muscle, in vivo vasopressin injection and plasma half-life measurement, ELISA for plasma and brain vasopressin levels\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic KO with multiple orthogonal in vivo and ex vivo readouts, strong mechanistic evidence\",\n      \"pmids\": [\"17684103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IRAP is required for insulin-stimulated GLUT4 storage vesicle (GSV) translocation: IRAP knockdown impaired insulin-stimulated GLUT4 translocation without affecting GLUT4 expression, while GLUT4 knockdown did not impair IRAP translocation. Tankyrase knockdown attenuated insulin-stimulated GSV translocation and glucose uptake without disrupting insulin-induced phosphorylation cascades, and tankyrase knockdown altered basal-state endosomal partitioning of GLUT4 and IRAP; these effects were reproduced by a general PARP inhibitor.\",\n      \"method\": \"siRNA knockdown in 3T3-L1 adipocytes, insulin-stimulated translocation assays, glucose uptake assays, iodixanol density gradient fractionation, PARP inhibitor (PJ34) treatment\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal knockdown experiments with multiple functional readouts, pharmacological validation, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"17059388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IRAP was localized to a Rab14+ endosomal storage compartment in human dendritic cells where it interacted with MHC class I molecules. IRAP deficiency compromised cross-presentation of exogenous antigens in vitro and in vivo by impairing N-terminal peptide trimming in this endosomal compartment, without affecting endogenous presentation, establishing IRAP as a component of the MHC class I cross-presentation pathway.\",\n      \"method\": \"Immunofluorescence localization, co-immunoprecipitation of IRAP with MHC class I, IRAP-deficient dendritic cell cross-presentation assays in vitro and in vivo\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic deficiency with specific in vitro and in vivo functional readouts, co-IP for complex identification, published in high-impact journal\",\n      \"pmids\": [\"19498108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cross-presentation in inflammatory monocyte-derived dendritic cells (moDC) requires IRAP, while steady-state CD8+ DCs use an IRAP-independent pathway for cross-priming. IRAP and mannose receptor are dispensable for cross-presentation by CD8+ DCs, and no diversion of endocytosed antigen into IRAP-containing endosomes was detected in these cells, demonstrating mechanistic differences between DC subsets.\",\n      \"method\": \"IRAP-deficient and mannose receptor-deficient DC cross-presentation assays, antigen trafficking experiments, in vivo cross-priming assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic deficiency in two DC populations with parallel functional assays, in vivo validation\",\n      \"pmids\": [\"19918052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IRAP knockout mice showed normal reproductive profiles (gestational period, litter size, parturition), and IRAP was undetectable in pregnant mouse serum. The cleavage site (Phe154-Ala155) required to release soluble IRAP is restricted to members of the hominidae family, explaining the absence of circulating IRAP in mice during pregnancy and indicating species-specific regulation of IRAP shedding.\",\n      \"method\": \"IRAP knockout mouse phenotypic analysis, Western blot of pregnant mouse serum, fluorimetric IRAP enzyme assay, sequence comparison across species\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO phenotyping with biochemical assays, single lab\",\n      \"pmids\": [\"19647771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Vimentin was identified as a cytoplasmic domain-binding partner of IRAP using pull-down assays and co-immunoprecipitation in 3T3-L1 adipocytes. Depletion of vimentin decreased insulin-stimulated GLUT4 translocation to the plasma membrane, suggesting vimentin tethers GLUT4 storage vesicles to the cytoskeleton through its interaction with IRAP.\",\n      \"method\": \"IRAP cytoplasmic domain pull-down, co-immunoprecipitation in 3T3-L1 adipocytes, vimentin siRNA knockdown with GLUT4 translocation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pull-down and co-IP with functional KD phenotype, single lab\",\n      \"pmids\": [\"21216232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In steady-state conventional dendritic cells (cDCs), IRAP co-localizes with Rab14 and Syntaxin 6 in regulated endosomal storage compartments, and IRAP deficiency compromises cross-presentation of both soluble and particulate antigens. IRAP recruitment to phagosomes was stronger in CD8+ DCs, contributing to their superior cross-presentation efficacy.\",\n      \"method\": \"Immunofluorescence colocalization, IRAP-deficient DC cross-presentation assays for soluble and particulate antigens\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic deficiency with multiple antigen types and DC subsets, replicates and extends Science 2009 paper\",\n      \"pmids\": [\"22238454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A missense variant rs2303138 (p.Ala763Thr) in LNPEP was associated with psoriasis susceptibility. LNPEP was significantly downregulated in psoriatic lesions, and pathway analysis indicated LNPEP involvement in the renin-angiotensin system, suggesting its role in connecting cardiovascular/metabolic pathways to inflammatory skin disease.\",\n      \"method\": \"GWAS with replication cohorts (total >18,000 subjects), expression analysis of LNPEP in psoriatic vs. control skin\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — primarily genetic association with expression correlation; no direct mechanistic experiment on the variant's effect on LNPEP function\",\n      \"pmids\": [\"23897274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Approximately 60% of IRAP is S-acylated in 3T3-L1 adipocytes. Site-directed mutagenesis mapped S-acylation to two cytoplasmic cysteine residues, one within the cytoplasmic side of the transmembrane domain and one just upstream; results suggest these cysteines are modified in a mutually exclusive manner. However, mutation of these cysteines did not affect plasma membrane localization in HEK293T cells, indicating S-acylation is not essential for trafficking through the secretory pathway.\",\n      \"method\": \"Semi-quantitative acyl-RAC technique, site-directed mutagenesis of cysteine residues, plasma membrane localization assay in HEK293T cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical acylation quantification plus mutagenesis identifying modified residues, single lab\",\n      \"pmids\": [\"26198666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"27-Hydroxycholesterol (27-OH) increased the levels and activity of IRAP in the brain, countered IRAP antagonist angiotensin IV (AngIV)-mediated glucose uptake, and enhanced levels of aminopeptidase N (AP-N). These effects were mediated by liver X receptors, revealing a molecular link between cholesterol metabolism, IRAP activity, and neuronal glucose uptake via the GLUT4/IRAP system.\",\n      \"method\": \"In vivo brain glucose PET imaging, GLUT4/IRAP expression analysis, AngIV treatment in IRAP-modulated cells, liver X receptor pathway analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and cell-based mechanistic studies linking 27-OH/LXR to IRAP regulation, multiple methods\",\n      \"pmids\": [\"28213512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LNPEP/IRAP is proposed as the evolutionary progenitor of the ERAP1/ERAP2/LNPEP gene cluster on chromosome 5, from which ERAP1 and ERAP2 may have derived by gene duplication. LNPEP's functions include regulation of the renin-angiotensin system (at cell membrane as AT4/angiotensin IV receptor) and contribution to antigen cross-presentation in endosomal vesicles; its role in antigen presentation is thought to be evolutionarily acquired later than its vasoregulatory function.\",\n      \"method\": \"Comparative genomic/evolutionary sequence analysis, review of functional biochemical data\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — primarily computational evolutionary analysis with functional synthesis from prior studies\",\n      \"pmids\": [\"32793222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Upon TCR ligation, the TCR-CD3ζ complex undergoes clathrin-mediated internalization while maintaining CD3ζ signalling from endosomal vesicles containing IRAP and the SNARE protein Syntaxin 6. IRAP deletion destabilized this compartment, enhanced plasma membrane TCR-CD3ζ expression but compromised overall CD3ζ signalling. Mice with T cell-specific IRAP deletion failed to develop efficient polyclonal anti-tumour responses, establishing IRAP-dependent endosomal TCR signalling as essential for T cell activation.\",\n      \"method\": \"IRAP conditional knockout in T cells, TCR internalization assays, CD3ζ signalling analysis (phosphorylation), immunofluorescence colocalization of TCR-CD3ζ with IRAP/Syntaxin 6 endosomes, in vivo anti-tumour response assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple mechanistic readouts (signalling, localization, in vivo function), published in high-impact journal\",\n      \"pmids\": [\"32487999\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LNPEP (IRAP) is a type II transmembrane zinc metallopeptidase (M1 family, oxytocinase subfamily) that resides in intracellular GLUT4 storage vesicles and IRAP+/Rab14+/Syntaxin-6+ endosomes in adipocytes, myocytes, dendritic cells, and T cells; it traffics to the plasma membrane in response to insulin (where it cleaves neuropeptides including vasopressin and oxytocin), serves as the angiotensin IV (AT4) receptor whose ligands competitively inhibit its catalytic site, facilitates GLUT4 vesicle exocytosis through cytoplasmic domain interactions with tankyrase (via RXXPDG motif), p115, and vimentin, mediates MHC class I cross-presentation by trimming peptides in endosomal compartments of dendritic cells, and maintains endosomal TCR-CD3ζ signalling required for T cell activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LNPEP (IRAP) is a type II transmembrane zinc-dependent M1-family aminopeptidase that resides on GLUT4 storage vesicles and specialized endosomal compartments, functioning both as an ectopeptidase that degrades circulating peptide hormones and as a trafficking scaffold that organizes insulin-responsive vesicle dynamics and endosomal signaling platforms. Its cytoplasmic domain recruits trafficking regulators including tankyrase (via a conserved RXXPDG motif), p115, and vimentin, and loss of IRAP impairs insulin-stimulated GLUT4 translocation and glucose uptake in adipocytes [PMID:10988299, PMID:12080061, PMID:15800058, PMID:21216232, PMID:17059388]. On the cell surface, IRAP cleaves vasopressin and functions as the angiotensin IV (AT4) receptor, where enzymatic inhibition by angiotensin IV analogues mediates their physiological effects on brain glucose metabolism and memory [PMID:17684103, PMID:16967438, PMID:28213512]. IRAP also defines a Rab14+/Syntaxin-6+ endosomal compartment required for dendritic cell antigen cross-presentation and for sustained endosomal TCR-CD3ζ signaling essential for T cell anti-tumour responses [PMID:22238454, PMID:32487999].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying a cytoplasmic binding partner established that IRAP's cytosolic domain serves as a docking site for signaling/scaffolding proteins on GLUT4 vesicles, answering how these vesicles are anchored intracellularly.\",\n      \"evidence\": \"Subcellular fractionation and binding assays in adipocytes showing tankyrase binds IRAP residues 96–101 and co-localizes with GLUT4 vesicles\",\n      \"pmids\": [\"10988299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of tankyrase–IRAP interaction for vesicle trafficking was not yet tested\", \"Whether tankyrase PARP activity modifies IRAP was unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that GLUT4-null adipocytes redistribute IRAP to the plasma membrane established that GLUT4 is required for intracellular retention of IRAP-containing vesicles, revealing co-dependent sorting.\",\n      \"evidence\": \"GLUT4 knockout mouse adipocytes analyzed by subcellular fractionation and immunofluorescence\",\n      \"pmids\": [\"11394912\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of mutual retention (direct interaction vs. shared sorting motifs) was unresolved\", \"Single lab observation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the conserved RXXPDG motif as the tankyrase-binding determinant defined a modular interaction shared across multiple tankyrase substrates, clarifying how IRAP engages the poly(ADP-ribose) polymerase machinery.\",\n      \"evidence\": \"Yeast two-hybrid and in vitro binding with RXXPDG mutagenesis\",\n      \"pmids\": [\"12080061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether tankyrase PARylates IRAP directly remained untested\", \"In vivo relevance of IRAP–tankyrase interaction for glucose homeostasis was not shown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of p115 as a second cytoplasmic domain interactor, whose dominant-negative overexpression blocked GLUT4 translocation, established that IRAP acts as a vesicle-tethering hub coordinating membrane trafficking machinery.\",\n      \"evidence\": \"Affinity pulldown with IRAP cytoplasmic domain, overexpression of p115 N-terminus blocking insulin-stimulated GLUT4 translocation in adipocytes\",\n      \"pmids\": [\"15800058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct tethering mechanism between p115 and target membranes was not resolved\", \"Whether p115 binding is competitive with tankyrase binding was unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that angiotensin IV analogues inhibit IRAP enzymatic activity answered the long-standing question of the molecular identity of the AT4 receptor, unifying a receptor pharmacology with a known aminopeptidase.\",\n      \"evidence\": \"Enzyme inhibition assays with recombinant human IRAP and structure–activity analysis of cyclic peptide ligands\",\n      \"pmids\": [\"16967438\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo confirmation that AT4-mediated memory effects require IRAP catalytic activity was not provided\", \"Crystal structure of ligand-bound IRAP was lacking\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Two studies established IRAP's dual functional requirement: knockout mice revealed vasopressin as an in vivo substrate whose clearance is insulin-dependent, while siRNA knockdown showed IRAP is required for insulin-stimulated GLUT4 translocation and glucose uptake.\",\n      \"evidence\": \"IRAP knockout mouse with vasopressin pharmacokinetics and plasma ELISA; IRAP and tankyrase siRNA in 3T3-L1 adipocytes with GLUT4 translocation and glucose uptake assays\",\n      \"pmids\": [\"17684103\", \"17059388\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRAP's trafficking role is separable from its catalytic activity was not tested\", \"Mechanism by which tankyrase PARP activity regulates GSV sorting remained unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Analysis of IRAP knockout mice during pregnancy revealed that the secretase cleavage site for soluble IRAP release is hominidae-specific, explaining why rodent models do not recapitulate serum IRAP changes seen in human pregnancy.\",\n      \"evidence\": \"IRAP knockout mouse serum Western blot, enzyme assay, sequence alignment of Phe154-Ala155 cleavage site\",\n      \"pmids\": [\"19647771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of soluble IRAP shedding in human physiology remains unresolved\", \"Single lab observation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying vimentin as a direct IRAP cytoplasmic domain partner that supports GLUT4 vesicle organization revealed a cytoskeletal anchoring mechanism for insulin-responsive vesicles.\",\n      \"evidence\": \"Pull-down and co-immunoprecipitation in 3T3-L1 adipocytes; vimentin siRNA reducing GLUT4 translocation\",\n      \"pmids\": [\"21216232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether vimentin binds IRAP at the same region as tankyrase or p115 was not mapped\", \"Single lab, no independent replication\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Localizing IRAP to Rab14+/Syntaxin-6+ endosomes in dendritic cells and showing that IRAP deficiency impairs antigen cross-presentation expanded IRAP's role from metabolic trafficking to immune function.\",\n      \"evidence\": \"IRAP-deficient dendritic cells with cross-presentation assays and CD8+ T cell readout; immunofluorescence co-localization\",\n      \"pmids\": [\"22238454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IRAP's aminopeptidase activity or its compartment-organizing role drives cross-presentation was not separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapping S-acylation to two mutually exclusive cysteine residues near the transmembrane domain added a post-translational regulatory layer to IRAP, though its functional impact on trafficking remained unclear.\",\n      \"evidence\": \"Acyl-RAC assay and cysteine mutagenesis in 3T3-L1 adipocytes and HEK293T cells\",\n      \"pmids\": [\"26198666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No effect on plasma membrane localization was detected; functional role of S-acylation in GLUT4 vesicle dynamics untested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that 27-hydroxycholesterol upregulates brain IRAP via liver X receptors, thereby opposing angiotensin IV-mediated glucose uptake, linked cholesterol metabolism to IRAP-dependent cognitive function.\",\n      \"evidence\": \"In vivo mouse 27-OH treatment with 18F-FDG brain uptake, IRAP activity assays, AngIV rescue experiments\",\n      \"pmids\": [\"28213512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LXR directly regulates LNPEP transcription was not demonstrated\", \"Relevance to human neurodegenerative disease is correlative\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional T cell-specific IRAP knockout demonstrated that IRAP endosomes sustain TCR-CD3ζ signaling after internalization and are required for anti-tumour immunity, establishing IRAP as a signaling endosome organizer beyond metabolic vesicle trafficking.\",\n      \"evidence\": \"Global and T cell-specific IRAP knockout mice; TCR internalization, CD3ζ phosphorylation, and in vivo tumour challenge\",\n      \"pmids\": [\"32487999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which IRAP maintains endosomal CD3ζ phosphorylation (scaffolding vs. peptide trimming) is unresolved\", \"Whether IRAP endosomal signaling operates in other lymphocyte subsets is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A central unresolved question is whether IRAP's trafficking/compartment-organizing function and its aminopeptidase catalytic activity are mechanistically separable across its diverse biological roles (GLUT4 translocation, cross-presentation, TCR signaling, AT4 receptor function).\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No catalytically dead knockin has been reported to separate enzymatic from scaffolding functions\", \"Structural basis of cytoplasmic domain interactions with multiple partners is lacking\", \"Whether IRAP endosomes represent a single compartment across adipocytes, dendritic cells, and T cells is unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 6, 7]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 2, 4, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 10]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 4, 9]}\n    ],\n    \"complexes\": [\n      \"GLUT4 storage vesicle (GSV)\"\n    ],\n    \"partners\": [\n      \"TNKS\",\n      \"TNKS2\",\n      \"USO1\",\n      \"VIM\",\n      \"SLC2A4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"LNPEP (IRAP/oxytocinase) is a type II transmembrane zinc metallopeptidase of the M1 aminopeptidase family that cleaves neuropeptide substrates—most notably vasopressin and oxytocin—at the cell surface and functions as the angiotensin IV (AT4) receptor, whose ligands act as competitive inhibitors of its catalytic site [PMID:8550619, PMID:11707427, PMID:12871575, PMID:17684103]. LNPEP resides on insulin-responsive GLUT4 storage vesicles and is required for their insulin-stimulated translocation to the plasma membrane, engaging cytoplasmic domain partners including tankyrase (via an RXXPDG motif), p115, and vimentin to coordinate vesicle tethering and exocytosis [PMID:10988299, PMID:12080061, PMID:15800058, PMID:17059388, PMID:21216232]. In dendritic cells, LNPEP localizes to Rab14⁺/Syntaxin-6⁺ endosomes where it trims peptides for MHC class I cross-presentation of exogenous antigens [PMID:19498108, PMID:22238454]. In T cells, LNPEP maintains endosomal TCR-CD3ζ signaling after clathrin-mediated internalization, and T cell–specific deletion impairs polyclonal anti-tumour immunity [PMID:32487999].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Cloning of LNPEP established it as a type II integral membrane zinc metallopeptidase capable of degrading oxytocin and vasopressin, resolving the molecular identity of placental leucine aminopeptidase.\",\n      \"evidence\": \"cDNA cloning and peptide sequencing of purified human placental protein\",\n      \"pmids\": [\"8550619\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo substrates confirmed\", \"Subcellular trafficking unknown\", \"Physiological function beyond pregnancy not addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of IRAP as the angiotensin AT4 receptor revealed that AT4 ligands such as angiotensin IV act by competitively inhibiting IRAP catalytic activity rather than signaling through a classical GPCR, reframing the AT4 receptor pharmacology as enzyme inhibition.\",\n      \"evidence\": \"Protein purification and peptide sequencing from bovine adrenal membranes; radioligand binding and enzyme inhibition assays in IRAP-transfected HEK293T cells\",\n      \"pmids\": [\"11707427\", \"12871575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AT4-mediated cognitive effects are fully explained by IRAP inhibition vs. other mechanisms\", \"Structural basis of competitive inhibition not yet resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Studies in GLUT4-null mice demonstrated that IRAP and GLUT4 are co-dependent in vesicular trafficking: loss of GLUT4 caused constitutive surface appearance of IRAP, establishing their mutual retention in an insulin-responsive intracellular compartment.\",\n      \"evidence\": \"Subcellular fractionation and immunofluorescence in GLUT4 knockout mouse adipocytes\",\n      \"pmids\": [\"11394912\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IRAP itself provides retention signals for the compartment\", \"Mechanism of constitutive translocation in GLUT4-null cells\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the RXXPDG tankyrase-binding motif in IRAP's cytoplasmic domain, and subsequent identification of p115 and vimentin as additional cytoplasmic domain partners, defined a molecular machinery through which IRAP coordinates GLUT4 storage vesicle tethering and insulin-stimulated exocytosis.\",\n      \"evidence\": \"Yeast two-hybrid, mutagenesis of RXXPDG motif, pull-down/co-IP in 3T3-L1 adipocytes, siRNA knockdown of tankyrase/vimentin with GLUT4 translocation and glucose uptake readouts\",\n      \"pmids\": [\"12080061\", \"10988299\", \"15800058\", \"17059388\", \"21216232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether tankyrase poly(ADP-ribosyl)ation of IRAP or a cargo protein is the functional output\", \"How p115 and vimentin interactions are coordinated temporally during insulin signaling\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"IRAP knockout mice revealed vasopressin as the first confirmed in vivo substrate, with elevated plasma vasopressin and prolonged half-life in null animals, and demonstrated that insulin accelerates vasopressin clearance through IRAP, linking insulin-stimulated IRAP surface translocation to neuropeptide metabolism.\",\n      \"evidence\": \"IRAP knockout mice, ex vivo adipocyte/muscle cleavage assays, in vivo plasma vasopressin half-life measurements\",\n      \"pmids\": [\"17684103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether oxytocin is similarly regulated in vivo\", \"Contribution of IRAP vs. other peptidases to systemic neuropeptide clearance\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that IRAP localizes to Rab14⁺ endosomes in dendritic cells and is required for MHC class I cross-presentation opened an entirely new functional axis—endosomal peptide trimming for antigen presentation—distinct from its metabolic and vasoregulatory roles.\",\n      \"evidence\": \"IRAP-deficient dendritic cells, co-IP with MHC class I, in vitro and in vivo cross-presentation assays; DC subset comparisons showing IRAP-dependent and -independent cross-presentation pathways\",\n      \"pmids\": [\"19498108\", \"19918052\", \"22238454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of peptides trimmed by IRAP in endosomes\", \"Whether IRAP enzymatic activity vs. scaffolding function is required for cross-presentation\", \"Relationship between IRAP and ERAP1/2 in antigen processing\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional T cell–specific IRAP deletion revealed that IRAP maintains an endosomal compartment (marked by Syntaxin 6) essential for sustained TCR-CD3ζ signaling after receptor internalization, with loss of IRAP enhancing surface TCR levels but paradoxically impairing signaling output and anti-tumour immunity.\",\n      \"evidence\": \"T cell–conditional IRAP knockout, TCR internalization and CD3ζ phosphorylation assays, colocalization with Syntaxin 6 endosomes, in vivo tumour challenge\",\n      \"pmids\": [\"32487999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRAP enzymatic activity or its role as a compartment organizer drives TCR signaling maintenance\", \"Applicability to other immune synapse contexts beyond tumour immunity\", \"Potential redundancy with ERAP1/2 in T cell endosomes\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether IRAP's catalytic activity versus its structural/trafficking role is the primary driver in cross-presentation and TCR signaling, the structural basis of AT4 ligand competitive inhibition, and how IRAP's three major functional axes—metabolic vesicle trafficking, antigen presentation, and endosomal TCR signaling—are coordinated or independently regulated across cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of full-length IRAP with bound AT4 ligand\", \"Enzymatic vs. scaffolding contribution not separated by catalytic-dead mutants in immune contexts\", \"Physiological relevance of S-acylation to IRAP trafficking in insulin-responsive tissues unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5, 7, 8, 10]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 5, 8]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 3, 6, 9, 10, 14, 19]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [10, 14, 19]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 8, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 11, 14, 19]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 6, 9, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5, 17]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 5, 7, 8]}\n    ],\n    \"complexes\": [\n      \"GLUT4 storage vesicle complex\"\n    ],\n    \"partners\": [\n      \"TNKS\",\n      \"GM130\",\n      \"VIM\",\n      \"SLC2A4\",\n      \"STX6\",\n      \"RAB14\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}