{"gene":"PEPD","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2017,"finding":"PEPD (prolidase) binds directly to the proline-rich domain of p53, suppressing over half of nuclear and cytoplasmic p53 under normal conditions independent of PEPD's enzymatic activity. This binding inhibits phosphorylation of nuclear p53 and MDM2-mediated mitochondrial translocation of both nuclear and cytoplasmic p53. Stress signals (doxorubicin, H2O2) release p53 from PEPD via reactive oxygen species, enabling robust p53 activation.","method":"Co-immunoprecipitation, domain mapping, mutagenesis separating enzymatic from non-enzymatic function, loss-of-function (PEPD elimination causing cell death/tumor regression), ROS inhibitor rescue experiments","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mapping, enzymatic-null mutant, multiple orthogonal methods (genetic KO, chemical stress, ROS inhibition), single lab but rigorous multi-method study","pmids":["29233996"],"is_preprint":false},{"year":2022,"finding":"PEPD (prolidase) plays a dual role in adipose tissue: (1) intracellularly, its enzymatic activity degrades proline-containing dipeptides as part of collagen turnover, and loss of enzymatic function (genetic ablation or pharmacological inhibition) causes adipose tissue fibrosis in mice; (2) extracellularly, secreted PEPD protein enhances macrophage and adipocyte fibro-inflammatory responses via EGFR signalling, promoting adipose tissue fibrosis and insulin resistance.","method":"Genetic ablation (mouse KO), pharmacological inhibition, measurement of PEPD activity and systemic PEPD levels, EGFR signalling pathway analysis, in vivo fibrosis phenotyping","journal":"Nature Metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic ablation with defined fibrosis phenotype, pharmacological inhibition, EGFR pathway mechanistic follow-up, multiple orthogonal approaches in one study","pmids":["35478031"],"is_preprint":false},{"year":2021,"finding":"Extracellular PEPD acts as a ligand for EGFR and stimulates fibroblast proliferation and migration via EGFR-downstream PI3K/Akt/mTOR signalling. PEPD also upregulates β1-integrin and IGF-1R expression and activates downstream FAK, Grb2, and ERK1/2, and increases collagen biosynthesis.","method":"Treatment of cultured fibroblasts with recombinant PEPD protein, Western blot analysis of signalling pathway activation, cell viability/proliferation/migration assays, collagen biosynthesis measurement","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, recombinant protein treatment with multiple downstream readouts but no genetic rescue or mutagenesis of EGFR binding site","pmids":["33477899"],"is_preprint":false},{"year":1991,"finding":"A 774-bp deletion including exon 14 in the PEPD gene produces an mRNA with 192-bp skipping (in-frame), yielding a truncated prolidase protein of Mr 49,000 that is enzymatically inactive. Transfection and expression of the mutant cDNA in prolidase-deficient fibroblasts confirmed the inactive polypeptide, establishing that the exon 14-encoded region is required for enzymatic activity.","method":"RT-PCR/mRNA analysis, genomic sequencing, transfection and expression of mutant cDNA in patient fibroblasts, enzymatic activity assay","journal":"The Journal of Clinical Investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional transfection/expression with enzymatic activity readout, single lab, single study","pmids":["2010534"],"is_preprint":false},{"year":2004,"finding":"A homozygous 3-bp deletion (Y231del) in PEPD results in loss of prolidase activity in skin fibroblasts and intracellular accumulation of Gly-Pro dipeptide. The mutation maps to the alpha2 domain of the proposed 'pita bread' fold, homologous to E. coli methionine aminopeptidase, supporting a structure-function model with at least three functional regions of the enzyme.","method":"SSCP analysis, cDNA sequencing, transient expression of mutant cDNA in prolidase-deficient fibroblasts, enzymatic activity assay, capillary electrophoresis for dipeptide accumulation","journal":"Journal of Human Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional expression with activity assay and substrate accumulation, single lab, two orthogonal methods","pmids":["15309682"],"is_preprint":false},{"year":2021,"finding":"X-ray crystallography of the PEPD p.(Arg470His) variant showed no significant structural difference from wild-type prolidase, while the p.(Leu192Pro) variant caused significant protein destabilization, establishing that Leu192 is critical for prolidase structural integrity. The p.(Tyr231del) variant was previously characterized by high-resolution X-ray structure as altering protein dynamics/flexibility.","method":"Site-directed mutagenesis, protein purification, X-ray crystallography of variant and wild-type prolidase","journal":"Genetics and Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with mutagenesis but single lab, limited functional follow-up beyond structural comparison","pmids":["33877262"],"is_preprint":false},{"year":1994,"finding":"Four PEPD alleles causing prolidase deficiency were identified: a G448R missense mutation, a 3-bp deletion (deltaE452/453), and two splice acceptor mutations (G→C at intron 4 position -1; A→G at intron 6 position -2) causing exon 5 and exon 7 skipping respectively, establishing that the severe form of prolidase deficiency results from multiple distinct loss-of-function alleles.","method":"RT-PCR of cDNA, SSCP analysis, direct sequencing, inverse PCR for intron-exon border identification","journal":"American Journal of Human Genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — molecular characterization of multiple alleles across multiple patients, consistent genotype-phenotype data","pmids":["8198124"],"is_preprint":false},{"year":2006,"finding":"A homozygous missense mutation in PEPD was identified as causing prolidase deficiency associated with hyper-IgE syndrome, demonstrating that loss-of-function of PEPD can produce immune dysregulation in addition to classic prolidase deficiency features.","method":"PCR amplification and RFLP analysis of PEPD gene, family segregation analysis","journal":"Clinical and Experimental Dermatology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single case, genetic identification only without functional enzymatic or mechanistic validation","pmids":["16681595"],"is_preprint":false},{"year":2006,"finding":"Prolidase (encoded by PEPD) functions as a ubiquitous cytosolic enzyme that catalyzes hydrolysis of oligopeptides with a C-terminal proline or hydroxyproline; a nonsense mutation (c.793T>C, p.R265X) in PEPD results in nearly undetectable prolidase activity in affected patients.","method":"Direct sequencing of PCR-amplified genomic DNA, enzymatic activity assay in patient cells","journal":"American Journal of Medical Genetics Part A","confidence":"Low","confidence_rationale":"Tier 3 / Weak — activity assay in patient cells without biochemical reconstitution or mutagenesis rescue, single study","pmids":["16470701"],"is_preprint":false}],"current_model":"PEPD-encoded prolidase is a cytosolic metalloenzyme that hydrolyzes proline/hydroxyproline-containing dipeptides as part of collagen turnover; beyond this enzymatic role, PEPD protein directly binds the proline-rich domain of p53 (independent of catalysis) to suppress p53 activity under basal conditions and store it for stress-induced activation via ROS-mediated release, while extracellular secreted PEPD acts as an EGFR ligand to drive fibro-inflammatory signalling in macrophages and adipocytes, and loss of PEPD enzymatic activity causes adipose tissue fibrosis and insulin resistance in vivo."},"narrative":{"mechanistic_narrative":"PEPD encodes prolidase, a ubiquitous cytosolic metalloenzyme that hydrolyzes oligopeptides bearing a C-terminal proline or hydroxyproline, a reaction central to collagen turnover [PMID:16470701]. Its catalytic apparatus depends on a 'pita bread' fold homologous to E. coli methionine aminopeptidase, and structure-function mapping of patient and engineered variants has identified residues critical for both catalytic competence and structural integrity, including an exon 14-encoded region required for activity, the alpha2-domain residue Tyr231, and Leu192 [PMID:2010534, PMID:15309682, PMID:33877262]. Loss-of-function alleles—missense, in-frame deletions, splice-site, and nonsense mutations—abolish prolidase activity and cause prolidase deficiency, with accumulation of proline-containing dipeptides such as Gly-Pro [PMID:15309682, PMID:8198124], and in at least one case associate the enzymatic defect with hyper-IgE immune dysregulation [PMID:16681595]. Beyond catalysis, PEPD protein has a non-enzymatic role: it binds directly to the proline-rich domain of p53, sequestering the majority of nuclear and cytoplasmic p53 under basal conditions, blocking its phosphorylation and MDM2-driven mitochondrial translocation, and releasing it for activation upon ROS-generating stress [PMID:29233996]. Extracellularly, secreted PEPD acts as an EGFR ligand that drives fibro-inflammatory signalling through PI3K/Akt/mTOR, FAK, Grb2, and ERK1/2 and increases collagen biosynthesis [PMID:33477899]; loss of its intracellular enzymatic function together with extracellular EGFR-driven signalling produces adipose tissue fibrosis and insulin resistance in vivo [PMID:35478031].","teleology":[{"year":1991,"claim":"Establishing which region of prolidase is required for catalysis answered how specific lesions destroy enzyme function in prolidase deficiency.","evidence":"mRNA/genomic analysis and transfection of an exon 14-skipping mutant cDNA into prolidase-deficient fibroblasts with activity readout","pmids":["2010534"],"confidence":"Medium","gaps":["No structural model of how the exon 14 region contributes to the active site","Single mutant studied; broader domain map incomplete"]},{"year":1994,"claim":"Cataloguing distinct loss-of-function alleles established that severe prolidase deficiency arises from multiple independent mutational mechanisms rather than a single founder lesion.","evidence":"RT-PCR, SSCP, sequencing and inverse PCR across patients identifying missense, deletion, and splice-acceptor mutations","pmids":["8198124"],"confidence":"Medium","gaps":["Enzymatic consequence of each allele not biochemically reconstituted","Genotype-phenotype severity correlation not resolved"]},{"year":2004,"claim":"Mapping Y231del to the alpha2 domain of the 'pita bread' fold connected a clinical mutation to a structural model and to substrate accumulation, defining functional regions of the enzyme.","evidence":"cDNA sequencing, transient expression in deficient fibroblasts, activity assay, and capillary electrophoresis detecting Gly-Pro accumulation","pmids":["15309682"],"confidence":"Medium","gaps":["Catalytic mechanism at atomic resolution not directly demonstrated here","Link between dipeptide accumulation and tissue pathology not established"]},{"year":2006,"claim":"Defining prolidase as a cytosolic C-terminal proline/hydroxyproline peptidase and linking a nonsense allele to near-absent activity grounded the enzyme's basic biochemical identity.","evidence":"Genomic sequencing and patient-cell enzymatic activity assays (p.R265X)","pmids":["16470701"],"confidence":"Low","gaps":["Activity assay in patient cells without biochemical reconstitution or mutagenesis rescue","Substrate specificity range not exhaustively mapped"]},{"year":2006,"claim":"Associating a PEPD missense mutation with hyper-IgE syndrome extended the phenotypic consequences of loss-of-function beyond classic prolidase deficiency to immune dysregulation.","evidence":"PCR/RFLP genotyping and family segregation in a single case","pmids":["16681595"],"confidence":"Low","gaps":["Single case without functional enzymatic or mechanistic validation","Mechanism linking prolidase loss to elevated IgE unknown"]},{"year":2017,"claim":"Discovery that PEPD binds the p53 proline-rich domain independent of catalysis revealed a moonlighting role as a basal p53 reservoir and stress-gated regulator, distinct from its peptidase function.","evidence":"Reciprocal Co-IP, domain mapping, enzymatic-null mutagenesis, genetic elimination causing tumor regression, and ROS-inhibitor rescue","pmids":["29233996"],"confidence":"High","gaps":["Structural basis of the PEPD–p53 interface not resolved","Precise ROS-dependent release mechanism not defined","Generality across cell types and in vivo relevance not established"]},{"year":2021,"claim":"Demonstrating extracellular PEPD as an EGFR ligand that activates PI3K/Akt/mTOR, FAK/Grb2/ERK and integrin/IGF-1R signalling defined a secreted, receptor-mediated pro-fibrotic function separate from intracellular catalysis.","evidence":"Recombinant PEPD treatment of fibroblasts with Western blot pathway analysis, proliferation/migration assays, and collagen biosynthesis measurement","pmids":["33477899"],"confidence":"Medium","gaps":["No mutagenesis of the EGFR-binding site or genetic rescue","Direct PEPD–EGFR binding affinity and stoichiometry not measured","Single lab, in vitro only"]},{"year":2021,"claim":"Crystallographic comparison of variants pinpointed which residues compromise the enzyme via destabilization versus dynamics, refining the structure-function basis of deficiency-causing mutations.","evidence":"Site-directed mutagenesis, protein purification, and X-ray crystallography of wild-type and variant prolidase (R470H, L192P, Y231del)","pmids":["33877262"],"confidence":"Medium","gaps":["Single lab with limited functional follow-up beyond structural comparison","Catalytic activity of each variant not quantitatively correlated with structure"]},{"year":2022,"claim":"In vivo dissection of PEPD's intracellular enzymatic versus extracellular EGFR-ligand activities established that loss of catalysis and secreted-PEPD signalling jointly drive adipose tissue fibrosis and insulin resistance.","evidence":"Mouse genetic ablation and pharmacological inhibition with fibrosis phenotyping, systemic PEPD measurement, and EGFR pathway analysis in macrophages and adipocytes","pmids":["35478031"],"confidence":"High","gaps":["Relative contribution of intracellular vs extracellular roles to the phenotype not fully separated","Source of secreted PEPD and regulation of its secretion unknown"]},{"year":null,"claim":"How PEPD's three activities—peptidase catalysis, non-enzymatic p53 sequestration, and extracellular EGFR ligation—are coordinated within a single cell or tissue, and whether they are mechanistically interdependent, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of the PEPD–EGFR or PEPD–p53 interfaces","Trigger and route of PEPD secretion uncharacterized","Interplay between collagen-turnover catalysis and signalling roles unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3,4,8]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,8]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,8]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,8]}],"complexes":[],"partners":["TP53","EGFR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P12955","full_name":"Xaa-Pro dipeptidase","aliases":["Imidodipeptidase","Peptidase D","Proline dipeptidase","Prolidase"],"length_aa":493,"mass_kda":54.5,"function":"Dipeptidase that catalyzes the hydrolysis of dipeptides with a prolyl (Xaa-Pro) or hydroxyprolyl residue in the C-terminal position (PubMed:17081196, PubMed:35165443). The preferred dipeptide substrate is Gly-Pro, but other Xaa-Pro dipeptides, such as Ala-Pro, Met-Pro, Phe-Pro, Val-Pro and Leu-Pro, can be cleaved (PubMed:17081196). Plays an important role in collagen metabolism because the high level of iminoacids in collagen (PubMed:2925654)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P12955/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PEPD","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":[],"url":"https://opencell.sf.czbiohub.org/search/PEPD","total_profiled":1310},"omim":[{"mim_id":"613230","title":"PEPTIDASE D; PEPD","url":"https://www.omim.org/entry/613230"},{"mim_id":"608083","title":"APOLIPOPROTEIN C-II; APOC2","url":"https://www.omim.org/entry/608083"},{"mim_id":"606800","title":"GLUCOSIDASE, ALPHA, ACID; GAA","url":"https://www.omim.org/entry/606800"},{"mim_id":"210900","title":"BLOOM SYNDROME; BLM","url":"https://www.omim.org/entry/210900"},{"mim_id":"190450","title":"TRIOSEPHOSPHATE ISOMERASE 1; TPI1","url":"https://www.omim.org/entry/190450"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"intestine","ntpm":201.1},{"tissue":"kidney","ntpm":310.3}],"url":"https://www.proteinatlas.org/search/PEPD"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P12955","domains":[{"cath_id":"3.40.350.10","chopping":"7-184","consensus_level":"high","plddt":98.5766,"start":7,"end":184},{"cath_id":"3.90.230.10","chopping":"188-479","consensus_level":"high","plddt":98.6764,"start":188,"end":479}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P12955","model_url":"https://alphafold.ebi.ac.uk/files/AF-P12955-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P12955-F1-predicted_aligned_error_v6.png","plddt_mean":97.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PEPD","jax_strain_url":"https://www.jax.org/strain/search?query=PEPD"},"sequence":{"accession":"P12955","fasta_url":"https://rest.uniprot.org/uniprotkb/P12955.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P12955/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P12955"}},"corpus_meta":[{"pmid":"3459164","id":"PMC_3459164","title":"Regional 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HtrA-like serine protease PepD interacts with and modulates the Mycobacterium tuberculosis 35-kDa antigen outer envelope protein.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21445360","citation_count":43,"is_preprint":false},{"pmid":"35478031","id":"PMC_35478031","title":"Dysregulation of macrophage PEPD in obesity determines adipose tissue fibro-inflammation and insulin resistance.","date":"2022","source":"Nature metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/35478031","citation_count":41,"is_preprint":false},{"pmid":"6825466","id":"PMC_6825466","title":"Provisional assignment of TPI, GPI, and PEPD to Chinese hamster autosomes 8 and 9: a cytogenetic basis for functional haploidy of an autosomal linkage group in CHO cells.","date":"1983","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/6825466","citation_count":32,"is_preprint":false},{"pmid":"1695895","id":"PMC_1695895","title":"Peptidase D gene (pepD) of Escherichia 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Part A","url":"https://pubmed.ncbi.nlm.nih.gov/36757671","citation_count":2,"is_preprint":false},{"pmid":"19255468","id":"PMC_19255468","title":"Purification, crystallization and preliminary X-ray analysis of an aminoacylhistidine dipeptidase (PepD) from Vibrio alginolyticus.","date":"2009","source":"Acta crystallographica. Section F, Structural biology and crystallization communications","url":"https://pubmed.ncbi.nlm.nih.gov/19255468","citation_count":2,"is_preprint":false},{"pmid":"37023562","id":"PMC_37023562","title":"Establishment of a human induced pluripotent stem cell line, KMUGMCi007-A, from a patient with prolidase deficiency (PD) bearing homozygous in-frame mutation in the PEPD gene.","date":"2023","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/37023562","citation_count":0,"is_preprint":false},{"pmid":"40401402","id":"PMC_40401402","title":"Patient With Prolidase Deficiency due to an Homozygous PEPD Variant, Induced by Paternal Uniparental Isodisomy of Chromosome 19.","date":"2025","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/40401402","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17493,"output_tokens":2400,"usd":0.04424,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9613,"output_tokens":3388,"usd":0.066382,"stage2_stop_reason":"end_turn"},"total_usd":0.110622,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"PEPD (prolidase) binds directly to the proline-rich domain of p53, suppressing over half of nuclear and cytoplasmic p53 under normal conditions independent of PEPD's enzymatic activity. This binding inhibits phosphorylation of nuclear p53 and MDM2-mediated mitochondrial translocation of both nuclear and cytoplasmic p53. Stress signals (doxorubicin, H2O2) release p53 from PEPD via reactive oxygen species, enabling robust p53 activation.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, mutagenesis separating enzymatic from non-enzymatic function, loss-of-function (PEPD elimination causing cell death/tumor regression), ROS inhibitor rescue experiments\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mapping, enzymatic-null mutant, multiple orthogonal methods (genetic KO, chemical stress, ROS inhibition), single lab but rigorous multi-method study\",\n      \"pmids\": [\"29233996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PEPD (prolidase) plays a dual role in adipose tissue: (1) intracellularly, its enzymatic activity degrades proline-containing dipeptides as part of collagen turnover, and loss of enzymatic function (genetic ablation or pharmacological inhibition) causes adipose tissue fibrosis in mice; (2) extracellularly, secreted PEPD protein enhances macrophage and adipocyte fibro-inflammatory responses via EGFR signalling, promoting adipose tissue fibrosis and insulin resistance.\",\n      \"method\": \"Genetic ablation (mouse KO), pharmacological inhibition, measurement of PEPD activity and systemic PEPD levels, EGFR signalling pathway analysis, in vivo fibrosis phenotyping\",\n      \"journal\": \"Nature Metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic ablation with defined fibrosis phenotype, pharmacological inhibition, EGFR pathway mechanistic follow-up, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"35478031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Extracellular PEPD acts as a ligand for EGFR and stimulates fibroblast proliferation and migration via EGFR-downstream PI3K/Akt/mTOR signalling. PEPD also upregulates β1-integrin and IGF-1R expression and activates downstream FAK, Grb2, and ERK1/2, and increases collagen biosynthesis.\",\n      \"method\": \"Treatment of cultured fibroblasts with recombinant PEPD protein, Western blot analysis of signalling pathway activation, cell viability/proliferation/migration assays, collagen biosynthesis measurement\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, recombinant protein treatment with multiple downstream readouts but no genetic rescue or mutagenesis of EGFR binding site\",\n      \"pmids\": [\"33477899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"A 774-bp deletion including exon 14 in the PEPD gene produces an mRNA with 192-bp skipping (in-frame), yielding a truncated prolidase protein of Mr 49,000 that is enzymatically inactive. Transfection and expression of the mutant cDNA in prolidase-deficient fibroblasts confirmed the inactive polypeptide, establishing that the exon 14-encoded region is required for enzymatic activity.\",\n      \"method\": \"RT-PCR/mRNA analysis, genomic sequencing, transfection and expression of mutant cDNA in patient fibroblasts, enzymatic activity assay\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional transfection/expression with enzymatic activity readout, single lab, single study\",\n      \"pmids\": [\"2010534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A homozygous 3-bp deletion (Y231del) in PEPD results in loss of prolidase activity in skin fibroblasts and intracellular accumulation of Gly-Pro dipeptide. The mutation maps to the alpha2 domain of the proposed 'pita bread' fold, homologous to E. coli methionine aminopeptidase, supporting a structure-function model with at least three functional regions of the enzyme.\",\n      \"method\": \"SSCP analysis, cDNA sequencing, transient expression of mutant cDNA in prolidase-deficient fibroblasts, enzymatic activity assay, capillary electrophoresis for dipeptide accumulation\",\n      \"journal\": \"Journal of Human Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional expression with activity assay and substrate accumulation, single lab, two orthogonal methods\",\n      \"pmids\": [\"15309682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"X-ray crystallography of the PEPD p.(Arg470His) variant showed no significant structural difference from wild-type prolidase, while the p.(Leu192Pro) variant caused significant protein destabilization, establishing that Leu192 is critical for prolidase structural integrity. The p.(Tyr231del) variant was previously characterized by high-resolution X-ray structure as altering protein dynamics/flexibility.\",\n      \"method\": \"Site-directed mutagenesis, protein purification, X-ray crystallography of variant and wild-type prolidase\",\n      \"journal\": \"Genetics and Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with mutagenesis but single lab, limited functional follow-up beyond structural comparison\",\n      \"pmids\": [\"33877262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Four PEPD alleles causing prolidase deficiency were identified: a G448R missense mutation, a 3-bp deletion (deltaE452/453), and two splice acceptor mutations (G→C at intron 4 position -1; A→G at intron 6 position -2) causing exon 5 and exon 7 skipping respectively, establishing that the severe form of prolidase deficiency results from multiple distinct loss-of-function alleles.\",\n      \"method\": \"RT-PCR of cDNA, SSCP analysis, direct sequencing, inverse PCR for intron-exon border identification\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — molecular characterization of multiple alleles across multiple patients, consistent genotype-phenotype data\",\n      \"pmids\": [\"8198124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A homozygous missense mutation in PEPD was identified as causing prolidase deficiency associated with hyper-IgE syndrome, demonstrating that loss-of-function of PEPD can produce immune dysregulation in addition to classic prolidase deficiency features.\",\n      \"method\": \"PCR amplification and RFLP analysis of PEPD gene, family segregation analysis\",\n      \"journal\": \"Clinical and Experimental Dermatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single case, genetic identification only without functional enzymatic or mechanistic validation\",\n      \"pmids\": [\"16681595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Prolidase (encoded by PEPD) functions as a ubiquitous cytosolic enzyme that catalyzes hydrolysis of oligopeptides with a C-terminal proline or hydroxyproline; a nonsense mutation (c.793T>C, p.R265X) in PEPD results in nearly undetectable prolidase activity in affected patients.\",\n      \"method\": \"Direct sequencing of PCR-amplified genomic DNA, enzymatic activity assay in patient cells\",\n      \"journal\": \"American Journal of Medical Genetics Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — activity assay in patient cells without biochemical reconstitution or mutagenesis rescue, single study\",\n      \"pmids\": [\"16470701\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PEPD-encoded prolidase is a cytosolic metalloenzyme that hydrolyzes proline/hydroxyproline-containing dipeptides as part of collagen turnover; beyond this enzymatic role, PEPD protein directly binds the proline-rich domain of p53 (independent of catalysis) to suppress p53 activity under basal conditions and store it for stress-induced activation via ROS-mediated release, while extracellular secreted PEPD acts as an EGFR ligand to drive fibro-inflammatory signalling in macrophages and adipocytes, and loss of PEPD enzymatic activity causes adipose tissue fibrosis and insulin resistance in vivo.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PEPD encodes prolidase, a ubiquitous cytosolic metalloenzyme that hydrolyzes oligopeptides bearing a C-terminal proline or hydroxyproline, a reaction central to collagen turnover [#8]. Its catalytic apparatus depends on a 'pita bread' fold homologous to E. coli methionine aminopeptidase, and structure-function mapping of patient and engineered variants has identified residues critical for both catalytic competence and structural integrity, including an exon 14-encoded region required for activity, the alpha2-domain residue Tyr231, and Leu192 [#3, #4, #5]. Loss-of-function alleles—missense, in-frame deletions, splice-site, and nonsense mutations—abolish prolidase activity and cause prolidase deficiency, with accumulation of proline-containing dipeptides such as Gly-Pro [#4, #6], and in at least one case associate the enzymatic defect with hyper-IgE immune dysregulation [#7]. Beyond catalysis, PEPD protein has a non-enzymatic role: it binds directly to the proline-rich domain of p53, sequestering the majority of nuclear and cytoplasmic p53 under basal conditions, blocking its phosphorylation and MDM2-driven mitochondrial translocation, and releasing it for activation upon ROS-generating stress [#0]. Extracellularly, secreted PEPD acts as an EGFR ligand that drives fibro-inflammatory signalling through PI3K/Akt/mTOR, FAK, Grb2, and ERK1/2 and increases collagen biosynthesis [#2]; loss of its intracellular enzymatic function together with extracellular EGFR-driven signalling produces adipose tissue fibrosis and insulin resistance in vivo [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing which region of prolidase is required for catalysis answered how specific lesions destroy enzyme function in prolidase deficiency.\",\n      \"evidence\": \"mRNA/genomic analysis and transfection of an exon 14-skipping mutant cDNA into prolidase-deficient fibroblasts with activity readout\",\n      \"pmids\": [\"2010534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of how the exon 14 region contributes to the active site\", \"Single mutant studied; broader domain map incomplete\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Cataloguing distinct loss-of-function alleles established that severe prolidase deficiency arises from multiple independent mutational mechanisms rather than a single founder lesion.\",\n      \"evidence\": \"RT-PCR, SSCP, sequencing and inverse PCR across patients identifying missense, deletion, and splice-acceptor mutations\",\n      \"pmids\": [\"8198124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Enzymatic consequence of each allele not biochemically reconstituted\", \"Genotype-phenotype severity correlation not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping Y231del to the alpha2 domain of the 'pita bread' fold connected a clinical mutation to a structural model and to substrate accumulation, defining functional regions of the enzyme.\",\n      \"evidence\": \"cDNA sequencing, transient expression in deficient fibroblasts, activity assay, and capillary electrophoresis detecting Gly-Pro accumulation\",\n      \"pmids\": [\"15309682\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Catalytic mechanism at atomic resolution not directly demonstrated here\", \"Link between dipeptide accumulation and tissue pathology not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defining prolidase as a cytosolic C-terminal proline/hydroxyproline peptidase and linking a nonsense allele to near-absent activity grounded the enzyme's basic biochemical identity.\",\n      \"evidence\": \"Genomic sequencing and patient-cell enzymatic activity assays (p.R265X)\",\n      \"pmids\": [\"16470701\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Activity assay in patient cells without biochemical reconstitution or mutagenesis rescue\", \"Substrate specificity range not exhaustively mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Associating a PEPD missense mutation with hyper-IgE syndrome extended the phenotypic consequences of loss-of-function beyond classic prolidase deficiency to immune dysregulation.\",\n      \"evidence\": \"PCR/RFLP genotyping and family segregation in a single case\",\n      \"pmids\": [\"16681595\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single case without functional enzymatic or mechanistic validation\", \"Mechanism linking prolidase loss to elevated IgE unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery that PEPD binds the p53 proline-rich domain independent of catalysis revealed a moonlighting role as a basal p53 reservoir and stress-gated regulator, distinct from its peptidase function.\",\n      \"evidence\": \"Reciprocal Co-IP, domain mapping, enzymatic-null mutagenesis, genetic elimination causing tumor regression, and ROS-inhibitor rescue\",\n      \"pmids\": [\"29233996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the PEPD–p53 interface not resolved\", \"Precise ROS-dependent release mechanism not defined\", \"Generality across cell types and in vivo relevance not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating extracellular PEPD as an EGFR ligand that activates PI3K/Akt/mTOR, FAK/Grb2/ERK and integrin/IGF-1R signalling defined a secreted, receptor-mediated pro-fibrotic function separate from intracellular catalysis.\",\n      \"evidence\": \"Recombinant PEPD treatment of fibroblasts with Western blot pathway analysis, proliferation/migration assays, and collagen biosynthesis measurement\",\n      \"pmids\": [\"33477899\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mutagenesis of the EGFR-binding site or genetic rescue\", \"Direct PEPD–EGFR binding affinity and stoichiometry not measured\", \"Single lab, in vitro only\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Crystallographic comparison of variants pinpointed which residues compromise the enzyme via destabilization versus dynamics, refining the structure-function basis of deficiency-causing mutations.\",\n      \"evidence\": \"Site-directed mutagenesis, protein purification, and X-ray crystallography of wild-type and variant prolidase (R470H, L192P, Y231del)\",\n      \"pmids\": [\"33877262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab with limited functional follow-up beyond structural comparison\", \"Catalytic activity of each variant not quantitatively correlated with structure\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In vivo dissection of PEPD's intracellular enzymatic versus extracellular EGFR-ligand activities established that loss of catalysis and secreted-PEPD signalling jointly drive adipose tissue fibrosis and insulin resistance.\",\n      \"evidence\": \"Mouse genetic ablation and pharmacological inhibition with fibrosis phenotyping, systemic PEPD measurement, and EGFR pathway analysis in macrophages and adipocytes\",\n      \"pmids\": [\"35478031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of intracellular vs extracellular roles to the phenotype not fully separated\", \"Source of secreted PEPD and regulation of its secretion unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PEPD's three activities—peptidase catalysis, non-enzymatic p53 sequestration, and extracellular EGFR ligation—are coordinated within a single cell or tissue, and whether they are mechanistically interdependent, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the PEPD–EGFR or PEPD–p53 interfaces\", \"Trigger and route of PEPD secretion uncharacterized\", \"Interplay between collagen-turnover catalysis and signalling roles unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 4, 8]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TP53\", \"EGFR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":5,"faith_pct":100.0}}