{"gene":"DNPEP","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2012,"finding":"Crystal structure of human DNPEP complexed with zinc and substrate analogue aspartate-β-hydroxamate reveals a dodecameric machinery built by domain-swapped dimers. The active site contains a binuclear zinc centre, and a substrate specificity pocket for acidic amino acids is defined. Active site loop swapping mediates catalysis, a mechanism shared with other M18/M42 metallopeptidases that form dodecameric complexes as a self-compartmentalization strategy.","method":"X-ray crystallography with substrate analogue, electron microscopy","journal":"BMC structural biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with bound ligand and substrate analogue, corroborated by EM, with structural comparison to bacterial homologues; replicated independently in same year by Chen et al. (PMID:22356908)","pmids":["22720794"],"is_preprint":false},{"year":2012,"finding":"DNPEP possesses a binuclear zinc active site in which one zinc ion is readily exchangeable with manganese, which strongly stimulates enzymatic activity. DNPEP assembles into a tetrahedral (dodecameric) complex that restricts substrate access to the active site, explaining preference for short peptide substrates with N-terminal acidic residues. DNPEP cleaves angiotensins and other physiologically relevant peptide substrates in vitro.","method":"X-ray crystallography, X-ray absorption spectroscopy, single-particle electron microscopy, in vitro enzymatic assay with metal substitution","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal structural and biochemical methods in one study, independently consistent with PMID:22720794","pmids":["22356908"],"is_preprint":false},{"year":2014,"finding":"DNPEP is the protease responsible for generating short inhibitory forms of SPAK kinase in kidney. Kidney lysate proteolytic activity toward SPAK was purified by ion exchange and size exclusion chromatography; mass spectrometry identified DNPEP as the protease. Recombinant aspartyl aminopeptidase recapitulated the cleavage pattern observed with kidney lysate. Mass spectrometry identified specific cleavage sites, and the resulting SPAK fragments were shown to inhibit the Na+-K+-2Cl- cotransporter NKCC2.","method":"Ion exchange chromatography, size exclusion chromatography, mass spectrometry, recombinant protein reconstitution, functional cotransporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — reconstitution with recombinant DNPEP recapitulating endogenous activity, MS identification of cleavage sites, functional inhibition assay; tempered by subsequent study (PMID:29122955) showing other proteases also cleave SPAK","pmids":["25164821"],"is_preprint":false},{"year":2017,"finding":"DNPEP knockout mouse kidney lysates (generated by EUCOMM mutation and CRISPR/Cas9) retain proteolytic activity toward SPAK, indicating that DNPEP is not the sole protease responsible for generating SPAK fragments in kidney, and that DNPEP may have been misidentified as the primary kidney lysate protease or is not the only one cleaving SPAK.","method":"CRISPR/Cas9 knockout mouse model, EUCOMM mutant mouse, in vitro proteolytic assay with kidney lysate","journal":"Physiological reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent knockout mouse models used, negative result well-controlled; directly challenges prior claim in PMID:25164821","pmids":["29122955"],"is_preprint":false},{"year":2011,"finding":"DNPEP is a target of miR-140 in chondrocytes (identified by Ago2-associated RNA profiling). DNPEP overexpression exerts a mild antagonistic effect on BMP signaling at a position downstream of Smad activation. In Mir140-null chondrocytes, elevated DNPEP reduces basal BMP signaling, and DNPEP knockdown reverses this reduction, placing DNPEP downstream of Smad activation in the BMP pathway.","method":"Ago2-associated RNA profiling, overexpression and knockdown in chondrocytes, BMP signaling reporter assay, Mir140-null mouse model","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in vivo (Mir140-null mouse) combined with gain- and loss-of-function in cells, BMP signaling pathway placement demonstrated; single lab","pmids":["21576357"],"is_preprint":false},{"year":2015,"finding":"DNPEP directly binds to the C-terminus of the chloride channel ClC-5. This interaction was identified by GST-pulldown/MS, confirmed by co-immunoprecipitation in cells, and further validated by direct binding of purified GST-ClC-5 and His-DNPEP proteins. DNPEP colocalizes with albumin-containing endocytic vesicles in renal proximal tubule cells, and DNPEP overexpression increases cell-surface ClC-5 levels and albumin uptake.","method":"GST pulldown, mass spectrometry, co-immunoprecipitation, purified protein binding assay, confocal immunofluorescence, albumin uptake assay","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding confirmed by purified proteins (direct) and co-IP in cells, functional consequence (albumin uptake) measured; single lab","pmids":["25587118"],"is_preprint":false},{"year":2015,"finding":"DNPEP overexpression in renal proximal tubule cells causes a significant decrease in G-actin as measured by DNase I inhibition assay, and DNPEP co-immunoprecipitates with β-actin and tubulin from kidney lysate, suggesting DNPEP stabilizes the actin cytoskeleton.","method":"Co-immunoprecipitation from kidney lysate, DNase I inhibition assay for G-actin quantification, overexpression in OK cells","journal":"American journal of physiology. Renal physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP and single functional assay in one cell line, no mechanistic follow-up on how DNPEP affects actin","pmids":["25587118"],"is_preprint":false},{"year":2019,"finding":"PAK5 interacts with and phosphorylates DNPEP at serine 119. PAK5 also decreases DNPEP protein abundance via the ubiquitin-proteasome pathway. DNPEP in turn mediates downregulation of USP4, placing DNPEP as an intermediary in the PAK5-DNPEP-USP4 signaling axis that controls breast cancer cell proliferation and invasion.","method":"Co-immunoprecipitation, in vitro/in vivo kinase assay (phosphorylation at S119), overexpression and knockdown with proliferation/invasion assays, proteasome inhibitor treatment, mouse xenograft model","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-substrate relationship demonstrated, pathway ordering via epistasis, multiple functional assays; single lab","pmids":["31219614"],"is_preprint":false},{"year":2019,"finding":"DNPEP promotes degradation of CD44 protein through a mechanism dependent on DNPEP's hydrolase activity and independent of the ubiquitin-proteasome pathway. Overexpression of DNPEP reduces CD44 levels and suppresses breast cancer cell stemness, while DNPEP knockdown elevates CD44.","method":"Overexpression and knockdown with CD44 protein quantification, proteasome inhibitor treatment (pathway exclusion), hydrolase-activity mutant analysis","journal":"Anatomical record","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, mechanism of CD44 degradation not fully defined beyond hydrolase activity dependence, no direct biochemical reconstitution","pmids":["31228326"],"is_preprint":false},{"year":2023,"finding":"FBXO3 disrupts the interaction between USP4 and DNPEP, thereby protecting USP4 from DNPEP-mediated degradation. This places DNPEP as a protease that degrades USP4 when not blocked by FBXO3.","method":"Co-immunoprecipitation, overexpression/knockdown assays, protein stability assays","journal":"PLoS biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — DNPEP-USP4 interaction and degradation supported by co-IP and protein level changes, but direct biochemical reconstitution of DNPEP-mediated USP4 degradation not described in abstract; single lab","pmids":["38134227"],"is_preprint":false},{"year":2010,"finding":"DNPEP (DAP) protein is localized to secretory granules and lysosomal-like structures in pancreatic islet alpha cells, as demonstrated by immunofluorescence and electron microscopy, consistent with a role in post-translational processing of hormones.","method":"Immunofluorescence, electron microscopy, cell-type-specific staining","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by immunostaining and EM with no direct functional manipulation to link localization to processing activity","pmids":["20944418"],"is_preprint":false},{"year":2014,"finding":"High-throughput screening of ~25,000 small molecules identified 23 DNPEP inhibitors that block DNPEP-catalyzed hydrolysis of angiotensin II with micromolar potency. Eight DNPEP-selective compounds were identified over the related glutamyl aminopeptidase ENPEP. Structure-activity relationships identified a metal-chelating group and charged/polar moieties as key pharmacophore features for active-site engagement.","method":"High-throughput enzymatic screen, counter-screen against ENPEP, SAR analysis, molecular modeling","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay with selectivity counter-screen; SAR provides mechanistic insight into active site; single lab","pmids":["24913940"],"is_preprint":false},{"year":2026,"finding":"DNPEP directly binds to RACK1 protein in tongue squamous cell carcinoma cells, activating the ERK signaling pathway, promoting EMT, proliferation, migration, invasion, and cisplatin resistance.","method":"Co-immunoprecipitation/protein interaction assay, in vitro and in vivo functional assays, signaling pathway analysis","journal":"Translational cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — direct binding and pathway activation reported but abstract provides limited methodological detail; single lab, no reconstitution or structural validation","pmids":["42180904"],"is_preprint":false}],"current_model":"DNPEP is a cytosolic M18 family aspartyl aminopeptidase that forms a dodecameric (tetrahedral) complex via domain-swapped dimers, harboring a binuclear zinc active site where one zinc is exchangeable with manganese to stimulate activity; it cleaves N-terminal acidic residues from short peptides including angiotensins, can be phosphorylated by PAK5 at serine 119 and degraded via the ubiquitin-proteasome pathway, regulates downstream targets including USP4 and CD44 through its proteolytic activity, localizes to endocytic vesicles and secretory granules in specialized cells, modulates BMP signaling downstream of Smad activation, and generates inhibitory SPAK fragments in kidney (though it may not be the sole kidney protease doing so), with its activity and abundance controlled by upstream regulators including miR-140 and PAK5."},"narrative":{"mechanistic_narrative":"DNPEP is a cytosolic M18-family aspartyl aminopeptidase that cleaves N-terminal acidic residues from short peptides, including angiotensins, and assembles into a tetrahedral dodecameric complex built from domain-swapped dimers, a self-compartmentalization strategy that restricts substrate access and explains its preference for short substrates [PMID:22720794, PMID:22356908]. Catalysis proceeds at a binuclear zinc active site in which one zinc is exchangeable with manganese to strongly stimulate activity, and the substrate-specificity pocket is shaped for acidic amino acids; small-molecule inhibitors selective over the related aminopeptidase ENPEP engage this metal-dependent active site [PMID:22356908, PMID:24913940]. Through its proteolytic and hydrolase activity DNPEP acts on several substrates and pathways: it can generate inhibitory SPAK fragments that suppress the NKCC2 cotransporter, although knockout kidneys retain SPAK-cleaving activity, indicating DNPEP is not the sole kidney protease performing this cleavage [PMID:25164821, PMID:29122955]. In cancer cells DNPEP functions as an intermediary in signaling control, being phosphorylated at serine 119 and destabilized by PAK5 via the ubiquitin-proteasome pathway, and in turn promoting downregulation of USP4 in the PAK5–DNPEP–USP4 axis [PMID:31219614]. DNPEP also acts on the BMP pathway downstream of Smad activation as a target of miR-140 in chondrocytes [PMID:21576357], and physically binds the chloride channel ClC-5 to modulate its surface levels and albumin endocytosis in renal proximal tubule cells [PMID:25587118].","teleology":[{"year":2011,"claim":"Established a regulatory and pathway context for DNPEP by identifying it as a miR-140 target that antagonizes BMP signaling downstream of Smad activation.","evidence":"Ago2-associated RNA profiling with gain/loss-of-function in chondrocytes and Mir140-null mouse, BMP reporter assay","pmids":["21576357"],"confidence":"Medium","gaps":["Molecular mechanism by which DNPEP dampens BMP signaling is undefined","No demonstration that DNPEP's peptidase activity is required for the BMP effect"]},{"year":2012,"claim":"Resolved the catalytic architecture of DNPEP, defining a dodecameric self-compartmentalized complex with a binuclear zinc active site and an acidic-residue specificity pocket.","evidence":"X-ray crystallography with substrate analogue, EM, XAS, and in vitro metal-substitution enzymatic assays","pmids":["22720794","22356908"],"confidence":"High","gaps":["In vivo physiological substrates beyond angiotensins not defined by structure","Role of the manganese-exchangeable zinc site in cellular regulation unknown"]},{"year":2014,"claim":"Identified DNPEP as a protease generating inhibitory SPAK fragments, linking it to ion cotransporter regulation in kidney.","evidence":"Chromatographic purification of kidney lysate activity, MS protease/cleavage-site identification, recombinant reconstitution, NKCC2 functional assay","pmids":["25164821"],"confidence":"Medium","gaps":["Did not establish DNPEP as the sole or dominant kidney SPAK protease","Physiological relevance of SPAK cleavage not tested in vivo"]},{"year":2014,"claim":"Demonstrated DNPEP is a druggable enzyme with selective active-site inhibitors, validating angiotensin II as a substrate and mapping pharmacophore features.","evidence":"High-throughput enzymatic screen of ~25,000 compounds, ENPEP counter-screen, SAR and molecular modeling","pmids":["24913940"],"confidence":"Medium","gaps":["Inhibitor efficacy in cells or in vivo not shown","No co-crystal structure confirming binding mode"]},{"year":2015,"claim":"Placed DNPEP at the endocytic machinery of renal proximal tubule by showing direct binding to ClC-5 and modulation of albumin uptake.","evidence":"GST pulldown/MS, co-IP, purified-protein binding, confocal colocalization, albumin uptake assay; plus low-confidence actin co-IP/G-actin assay","pmids":["25587118"],"confidence":"Medium","gaps":["Whether the ClC-5 effect requires DNPEP peptidase activity is unresolved","Cytoskeletal stabilization role rests on a single co-IP and assay"]},{"year":2017,"claim":"Challenged the SPAK-protease model by showing DNPEP-null kidneys retain SPAK-cleaving activity, indicating redundancy or misidentification.","evidence":"Two independent knockout mouse models (EUCOMM and CRISPR/Cas9), in vitro kidney lysate proteolysis","pmids":["29122955"],"confidence":"Medium","gaps":["Identity of the additional/alternative SPAK protease(s) not determined","Does not address DNPEP's contribution under physiological conditions"]},{"year":2019,"claim":"Defined DNPEP as both a regulated node and an effector in cancer signaling: a PAK5 substrate (S119) that is proteasomally destabilized and that drives USP4 and CD44 downregulation.","evidence":"Co-IP, in vitro/in vivo kinase assays, proteasome inhibition, hydrolase-mutant analysis, proliferation/invasion and xenograft assays","pmids":["31219614","31228326"],"confidence":"Medium","gaps":["Direct proteolytic cleavage of USP4/CD44 by DNPEP not biochemically reconstituted","CD44 degradation mechanism beyond hydrolase-activity dependence undefined"]},{"year":2023,"claim":"Extended the DNPEP-USP4 axis by showing FBXO3 shields USP4 from DNPEP, reinforcing DNPEP as a USP4-destabilizing protease.","evidence":"Co-IP, overexpression/knockdown, protein stability assays","pmids":["38134227"],"confidence":"Low","gaps":["Direct DNPEP-mediated USP4 degradation not reconstituted biochemically","Single lab; mechanism of cleavage versus regulated turnover unclear"]},{"year":2026,"claim":"Implicated DNPEP in a further oncogenic interaction by reporting direct binding to RACK1 and ERK pathway activation in tongue carcinoma.","evidence":"Co-IP/interaction assay, in vitro and in vivo functional assays, signaling analysis","pmids":["42180904"],"confidence":"Low","gaps":["Limited methodological detail; no reconstitution or structural validation","Whether peptidase activity is required for RACK1/ERK effect unknown"]},{"year":null,"claim":"The endogenous physiological substrate repertoire of DNPEP and how its peptidase activity mechanistically connects to its diverse reported roles (BMP, ClC-5, USP4/CD44, RACK1) remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying in vivo substrate identified across pathways","Unclear which interactions depend on catalysis versus scaffolding","Tissue-specific functions not integrated into one mechanistic model"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,2,11]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,8]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,7,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,7,12]}],"complexes":["DNPEP homododecamer"],"partners":["CLCN5","PAK5","USP4","FBXO3","RACK1","ACTB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9ULA0","full_name":"Aspartyl aminopeptidase","aliases":[],"length_aa":485,"mass_kda":53.4,"function":"Aminopeptidase with specificity towards an acidic amino acid at the N-terminus. Likely to play an important role in intracellular protein and peptide metabolism","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9ULA0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNPEP","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SEC61B","stoichiometry":4.0},{"gene":"RACK1","stoichiometry":0.2},{"gene":"RBM8A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DNPEP","total_profiled":1310},"omim":[{"mim_id":"611894","title":"MICRO RNA 140; MIR140","url":"https://www.omim.org/entry/611894"},{"mim_id":"611367","title":"ASPARTYL AMINOPEPTIDASE; DNPEP","url":"https://www.omim.org/entry/611367"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DNPEP"},"hgnc":{"alias_symbol":["DAP","ASPEP"],"prev_symbol":[]},"alphafold":{"accession":"Q9ULA0","domains":[{"cath_id":"3.40.630.10","chopping":"23-108_272-482","consensus_level":"high","plddt":98.4269,"start":23,"end":482},{"cath_id":"2.30.250.10","chopping":"110-181_191-255","consensus_level":"high","plddt":94.3181,"start":110,"end":255}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9ULA0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9ULA0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9ULA0-F1-predicted_aligned_error_v6.png","plddt_mean":95.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNPEP","jax_strain_url":"https://www.jax.org/strain/search?query=DNPEP"},"sequence":{"accession":"Q9ULA0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9ULA0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9ULA0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9ULA0"}},"corpus_meta":[{"pmid":"21576357","id":"PMC_21576357","title":"Chondrocyte-specific microRNA-140 regulates endochondral bone development and targets Dnpep to modulate bone morphogenetic protein signaling.","date":"2011","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21576357","citation_count":147,"is_preprint":false},{"pmid":"19099420","id":"PMC_19099420","title":"Protein profilings in mouse liver regeneration after partial hepatectomy using iTRAQ technology.","date":"2009","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/19099420","citation_count":47,"is_preprint":false},{"pmid":"22720794","id":"PMC_22720794","title":"Structure of human aspartyl aminopeptidase complexed with substrate analogue: insight into catalytic mechanism, substrate specificity and M18 peptidase family.","date":"2012","source":"BMC structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/22720794","citation_count":30,"is_preprint":false},{"pmid":"22356908","id":"PMC_22356908","title":"Insights into substrate specificity and metal activation of mammalian tetrahedral aspartyl aminopeptidase.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22356908","citation_count":29,"is_preprint":false},{"pmid":"31219614","id":"PMC_31219614","title":"A PAK5-DNPEP-USP4 axis dictates breast cancer growth and metastasis.","date":"2019","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31219614","citation_count":28,"is_preprint":false},{"pmid":"38134227","id":"PMC_38134227","title":"FBXO3 stabilizes USP4 and Twist1 to promote PI3K-mediated breast cancer metastasis.","date":"2023","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/38134227","citation_count":22,"is_preprint":false},{"pmid":"25477470","id":"PMC_25477470","title":"STE20/SPS1-related proline/alanine-rich kinase (SPAK) is critical for sodium reabsorption in isolated, perfused thick ascending limb.","date":"2014","source":"American journal of physiology. Renal physiology","url":"https://pubmed.ncbi.nlm.nih.gov/25477470","citation_count":21,"is_preprint":false},{"pmid":"25164821","id":"PMC_25164821","title":"Short forms of Ste20-related proline/alanine-rich kinase (SPAK) in the kidney are created by aspartyl aminopeptidase (Dnpep)-mediated proteolytic cleavage.","date":"2014","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25164821","citation_count":16,"is_preprint":false},{"pmid":"35926468","id":"PMC_35926468","title":"Cancer genes disfavoring T cell immunity identified via integrated systems approach.","date":"2022","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35926468","citation_count":12,"is_preprint":false},{"pmid":"20467754","id":"PMC_20467754","title":"A locus for juvenile myoclonic epilepsy maps to 2q33-q36.","date":"2010","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20467754","citation_count":12,"is_preprint":false},{"pmid":"24913940","id":"PMC_24913940","title":"Identification and characterization of novel inhibitors of Mammalian aspartyl aminopeptidase.","date":"2014","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/24913940","citation_count":11,"is_preprint":false},{"pmid":"25587118","id":"PMC_25587118","title":"Chloride channel ClC-5 binds to aspartyl aminopeptidase to regulate renal albumin endocytosis.","date":"2015","source":"American journal of physiology. 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Bio","url":"https://pubmed.ncbi.nlm.nih.gov/41142432","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11824,"output_tokens":3406,"usd":0.043281,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11020,"output_tokens":3201,"usd":0.067562,"stage2_stop_reason":"end_turn"},"total_usd":0.110843,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of human DNPEP complexed with zinc and substrate analogue aspartate-β-hydroxamate reveals a dodecameric machinery built by domain-swapped dimers. The active site contains a binuclear zinc centre, and a substrate specificity pocket for acidic amino acids is defined. Active site loop swapping mediates catalysis, a mechanism shared with other M18/M42 metallopeptidases that form dodecameric complexes as a self-compartmentalization strategy.\",\n      \"method\": \"X-ray crystallography with substrate analogue, electron microscopy\",\n      \"journal\": \"BMC structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with bound ligand and substrate analogue, corroborated by EM, with structural comparison to bacterial homologues; replicated independently in same year by Chen et al. (PMID:22356908)\",\n      \"pmids\": [\"22720794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DNPEP possesses a binuclear zinc active site in which one zinc ion is readily exchangeable with manganese, which strongly stimulates enzymatic activity. DNPEP assembles into a tetrahedral (dodecameric) complex that restricts substrate access to the active site, explaining preference for short peptide substrates with N-terminal acidic residues. DNPEP cleaves angiotensins and other physiologically relevant peptide substrates in vitro.\",\n      \"method\": \"X-ray crystallography, X-ray absorption spectroscopy, single-particle electron microscopy, in vitro enzymatic assay with metal substitution\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal structural and biochemical methods in one study, independently consistent with PMID:22720794\",\n      \"pmids\": [\"22356908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNPEP is the protease responsible for generating short inhibitory forms of SPAK kinase in kidney. Kidney lysate proteolytic activity toward SPAK was purified by ion exchange and size exclusion chromatography; mass spectrometry identified DNPEP as the protease. Recombinant aspartyl aminopeptidase recapitulated the cleavage pattern observed with kidney lysate. Mass spectrometry identified specific cleavage sites, and the resulting SPAK fragments were shown to inhibit the Na+-K+-2Cl- cotransporter NKCC2.\",\n      \"method\": \"Ion exchange chromatography, size exclusion chromatography, mass spectrometry, recombinant protein reconstitution, functional cotransporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reconstitution with recombinant DNPEP recapitulating endogenous activity, MS identification of cleavage sites, functional inhibition assay; tempered by subsequent study (PMID:29122955) showing other proteases also cleave SPAK\",\n      \"pmids\": [\"25164821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DNPEP knockout mouse kidney lysates (generated by EUCOMM mutation and CRISPR/Cas9) retain proteolytic activity toward SPAK, indicating that DNPEP is not the sole protease responsible for generating SPAK fragments in kidney, and that DNPEP may have been misidentified as the primary kidney lysate protease or is not the only one cleaving SPAK.\",\n      \"method\": \"CRISPR/Cas9 knockout mouse model, EUCOMM mutant mouse, in vitro proteolytic assay with kidney lysate\",\n      \"journal\": \"Physiological reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent knockout mouse models used, negative result well-controlled; directly challenges prior claim in PMID:25164821\",\n      \"pmids\": [\"29122955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DNPEP is a target of miR-140 in chondrocytes (identified by Ago2-associated RNA profiling). DNPEP overexpression exerts a mild antagonistic effect on BMP signaling at a position downstream of Smad activation. In Mir140-null chondrocytes, elevated DNPEP reduces basal BMP signaling, and DNPEP knockdown reverses this reduction, placing DNPEP downstream of Smad activation in the BMP pathway.\",\n      \"method\": \"Ago2-associated RNA profiling, overexpression and knockdown in chondrocytes, BMP signaling reporter assay, Mir140-null mouse model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in vivo (Mir140-null mouse) combined with gain- and loss-of-function in cells, BMP signaling pathway placement demonstrated; single lab\",\n      \"pmids\": [\"21576357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNPEP directly binds to the C-terminus of the chloride channel ClC-5. This interaction was identified by GST-pulldown/MS, confirmed by co-immunoprecipitation in cells, and further validated by direct binding of purified GST-ClC-5 and His-DNPEP proteins. DNPEP colocalizes with albumin-containing endocytic vesicles in renal proximal tubule cells, and DNPEP overexpression increases cell-surface ClC-5 levels and albumin uptake.\",\n      \"method\": \"GST pulldown, mass spectrometry, co-immunoprecipitation, purified protein binding assay, confocal immunofluorescence, albumin uptake assay\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding confirmed by purified proteins (direct) and co-IP in cells, functional consequence (albumin uptake) measured; single lab\",\n      \"pmids\": [\"25587118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNPEP overexpression in renal proximal tubule cells causes a significant decrease in G-actin as measured by DNase I inhibition assay, and DNPEP co-immunoprecipitates with β-actin and tubulin from kidney lysate, suggesting DNPEP stabilizes the actin cytoskeleton.\",\n      \"method\": \"Co-immunoprecipitation from kidney lysate, DNase I inhibition assay for G-actin quantification, overexpression in OK cells\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP and single functional assay in one cell line, no mechanistic follow-up on how DNPEP affects actin\",\n      \"pmids\": [\"25587118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PAK5 interacts with and phosphorylates DNPEP at serine 119. PAK5 also decreases DNPEP protein abundance via the ubiquitin-proteasome pathway. DNPEP in turn mediates downregulation of USP4, placing DNPEP as an intermediary in the PAK5-DNPEP-USP4 signaling axis that controls breast cancer cell proliferation and invasion.\",\n      \"method\": \"Co-immunoprecipitation, in vitro/in vivo kinase assay (phosphorylation at S119), overexpression and knockdown with proliferation/invasion assays, proteasome inhibitor treatment, mouse xenograft model\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-substrate relationship demonstrated, pathway ordering via epistasis, multiple functional assays; single lab\",\n      \"pmids\": [\"31219614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNPEP promotes degradation of CD44 protein through a mechanism dependent on DNPEP's hydrolase activity and independent of the ubiquitin-proteasome pathway. Overexpression of DNPEP reduces CD44 levels and suppresses breast cancer cell stemness, while DNPEP knockdown elevates CD44.\",\n      \"method\": \"Overexpression and knockdown with CD44 protein quantification, proteasome inhibitor treatment (pathway exclusion), hydrolase-activity mutant analysis\",\n      \"journal\": \"Anatomical record\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, mechanism of CD44 degradation not fully defined beyond hydrolase activity dependence, no direct biochemical reconstitution\",\n      \"pmids\": [\"31228326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FBXO3 disrupts the interaction between USP4 and DNPEP, thereby protecting USP4 from DNPEP-mediated degradation. This places DNPEP as a protease that degrades USP4 when not blocked by FBXO3.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown assays, protein stability assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — DNPEP-USP4 interaction and degradation supported by co-IP and protein level changes, but direct biochemical reconstitution of DNPEP-mediated USP4 degradation not described in abstract; single lab\",\n      \"pmids\": [\"38134227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DNPEP (DAP) protein is localized to secretory granules and lysosomal-like structures in pancreatic islet alpha cells, as demonstrated by immunofluorescence and electron microscopy, consistent with a role in post-translational processing of hormones.\",\n      \"method\": \"Immunofluorescence, electron microscopy, cell-type-specific staining\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by immunostaining and EM with no direct functional manipulation to link localization to processing activity\",\n      \"pmids\": [\"20944418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"High-throughput screening of ~25,000 small molecules identified 23 DNPEP inhibitors that block DNPEP-catalyzed hydrolysis of angiotensin II with micromolar potency. Eight DNPEP-selective compounds were identified over the related glutamyl aminopeptidase ENPEP. Structure-activity relationships identified a metal-chelating group and charged/polar moieties as key pharmacophore features for active-site engagement.\",\n      \"method\": \"High-throughput enzymatic screen, counter-screen against ENPEP, SAR analysis, molecular modeling\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay with selectivity counter-screen; SAR provides mechanistic insight into active site; single lab\",\n      \"pmids\": [\"24913940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DNPEP directly binds to RACK1 protein in tongue squamous cell carcinoma cells, activating the ERK signaling pathway, promoting EMT, proliferation, migration, invasion, and cisplatin resistance.\",\n      \"method\": \"Co-immunoprecipitation/protein interaction assay, in vitro and in vivo functional assays, signaling pathway analysis\",\n      \"journal\": \"Translational cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — direct binding and pathway activation reported but abstract provides limited methodological detail; single lab, no reconstitution or structural validation\",\n      \"pmids\": [\"42180904\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNPEP is a cytosolic M18 family aspartyl aminopeptidase that forms a dodecameric (tetrahedral) complex via domain-swapped dimers, harboring a binuclear zinc active site where one zinc is exchangeable with manganese to stimulate activity; it cleaves N-terminal acidic residues from short peptides including angiotensins, can be phosphorylated by PAK5 at serine 119 and degraded via the ubiquitin-proteasome pathway, regulates downstream targets including USP4 and CD44 through its proteolytic activity, localizes to endocytic vesicles and secretory granules in specialized cells, modulates BMP signaling downstream of Smad activation, and generates inhibitory SPAK fragments in kidney (though it may not be the sole kidney protease doing so), with its activity and abundance controlled by upstream regulators including miR-140 and PAK5.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNPEP is a cytosolic M18-family aspartyl aminopeptidase that cleaves N-terminal acidic residues from short peptides, including angiotensins, and assembles into a tetrahedral dodecameric complex built from domain-swapped dimers, a self-compartmentalization strategy that restricts substrate access and explains its preference for short substrates [#0, #1]. Catalysis proceeds at a binuclear zinc active site in which one zinc is exchangeable with manganese to strongly stimulate activity, and the substrate-specificity pocket is shaped for acidic amino acids; small-molecule inhibitors selective over the related aminopeptidase ENPEP engage this metal-dependent active site [#1, #11]. Through its proteolytic and hydrolase activity DNPEP acts on several substrates and pathways: it can generate inhibitory SPAK fragments that suppress the NKCC2 cotransporter, although knockout kidneys retain SPAK-cleaving activity, indicating DNPEP is not the sole kidney protease performing this cleavage [#2, #3]. In cancer cells DNPEP functions as an intermediary in signaling control, being phosphorylated at serine 119 and destabilized by PAK5 via the ubiquitin-proteasome pathway, and in turn promoting downregulation of USP4 in the PAK5–DNPEP–USP4 axis [#7]. DNPEP also acts on the BMP pathway downstream of Smad activation as a target of miR-140 in chondrocytes [#4], and physically binds the chloride channel ClC-5 to modulate its surface levels and albumin endocytosis in renal proximal tubule cells [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established a regulatory and pathway context for DNPEP by identifying it as a miR-140 target that antagonizes BMP signaling downstream of Smad activation.\",\n      \"evidence\": \"Ago2-associated RNA profiling with gain/loss-of-function in chondrocytes and Mir140-null mouse, BMP reporter assay\",\n      \"pmids\": [\"21576357\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which DNPEP dampens BMP signaling is undefined\", \"No demonstration that DNPEP's peptidase activity is required for the BMP effect\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the catalytic architecture of DNPEP, defining a dodecameric self-compartmentalized complex with a binuclear zinc active site and an acidic-residue specificity pocket.\",\n      \"evidence\": \"X-ray crystallography with substrate analogue, EM, XAS, and in vitro metal-substitution enzymatic assays\",\n      \"pmids\": [\"22720794\", \"22356908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological substrates beyond angiotensins not defined by structure\", \"Role of the manganese-exchangeable zinc site in cellular regulation unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified DNPEP as a protease generating inhibitory SPAK fragments, linking it to ion cotransporter regulation in kidney.\",\n      \"evidence\": \"Chromatographic purification of kidney lysate activity, MS protease/cleavage-site identification, recombinant reconstitution, NKCC2 functional assay\",\n      \"pmids\": [\"25164821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish DNPEP as the sole or dominant kidney SPAK protease\", \"Physiological relevance of SPAK cleavage not tested in vivo\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated DNPEP is a druggable enzyme with selective active-site inhibitors, validating angiotensin II as a substrate and mapping pharmacophore features.\",\n      \"evidence\": \"High-throughput enzymatic screen of ~25,000 compounds, ENPEP counter-screen, SAR and molecular modeling\",\n      \"pmids\": [\"24913940\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Inhibitor efficacy in cells or in vivo not shown\", \"No co-crystal structure confirming binding mode\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed DNPEP at the endocytic machinery of renal proximal tubule by showing direct binding to ClC-5 and modulation of albumin uptake.\",\n      \"evidence\": \"GST pulldown/MS, co-IP, purified-protein binding, confocal colocalization, albumin uptake assay; plus low-confidence actin co-IP/G-actin assay\",\n      \"pmids\": [\"25587118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the ClC-5 effect requires DNPEP peptidase activity is unresolved\", \"Cytoskeletal stabilization role rests on a single co-IP and assay\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Challenged the SPAK-protease model by showing DNPEP-null kidneys retain SPAK-cleaving activity, indicating redundancy or misidentification.\",\n      \"evidence\": \"Two independent knockout mouse models (EUCOMM and CRISPR/Cas9), in vitro kidney lysate proteolysis\",\n      \"pmids\": [\"29122955\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the additional/alternative SPAK protease(s) not determined\", \"Does not address DNPEP's contribution under physiological conditions\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined DNPEP as both a regulated node and an effector in cancer signaling: a PAK5 substrate (S119) that is proteasomally destabilized and that drives USP4 and CD44 downregulation.\",\n      \"evidence\": \"Co-IP, in vitro/in vivo kinase assays, proteasome inhibition, hydrolase-mutant analysis, proliferation/invasion and xenograft assays\",\n      \"pmids\": [\"31219614\", \"31228326\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct proteolytic cleavage of USP4/CD44 by DNPEP not biochemically reconstituted\", \"CD44 degradation mechanism beyond hydrolase-activity dependence undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended the DNPEP-USP4 axis by showing FBXO3 shields USP4 from DNPEP, reinforcing DNPEP as a USP4-destabilizing protease.\",\n      \"evidence\": \"Co-IP, overexpression/knockdown, protein stability assays\",\n      \"pmids\": [\"38134227\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct DNPEP-mediated USP4 degradation not reconstituted biochemically\", \"Single lab; mechanism of cleavage versus regulated turnover unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Implicated DNPEP in a further oncogenic interaction by reporting direct binding to RACK1 and ERK pathway activation in tongue carcinoma.\",\n      \"evidence\": \"Co-IP/interaction assay, in vitro and in vivo functional assays, signaling analysis\",\n      \"pmids\": [\"42180904\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Limited methodological detail; no reconstitution or structural validation\", \"Whether peptidase activity is required for RACK1/ERK effect unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endogenous physiological substrate repertoire of DNPEP and how its peptidase activity mechanistically connects to its diverse reported roles (BMP, ClC-5, USP4/CD44, RACK1) remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying in vivo substrate identified across pathways\", \"Unclear which interactions depend on catalysis versus scaffolding\", \"Tissue-specific functions not integrated into one mechanistic model\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 2, 11]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0008237\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 7, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 7, 12]}\n    ],\n    \"complexes\": [\"DNPEP homododecamer\"],\n    \"partners\": [\"CLCN5\", \"PAK5\", \"USP4\", \"FBXO3\", \"RACK1\", \"ACTB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}