{"gene":"ACP3","run_date":"2026-06-09T22:02:39","timeline":{"discoveries":[{"year":1989,"finding":"The human ACPP gene encoding prostatic acid phosphatase was chromosomally localized to segment 3q21–qter by Southern blotting analysis of human×rodent somatic cell hybrid panels, and two simultaneous diallelic TaqI RFLPs (A and B) were identified at this locus.","method":"Southern blotting of somatic cell hybrid panels; RFLP analysis","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic mapping by somatic cell hybrids with RFLP confirmation, single lab but two orthogonal methods","pmids":["2575485"],"is_preprint":false},{"year":1993,"finding":"The ACPP gene encoding prostatic acid phosphatase was further sublocalized to chromosome 3q21–q23 by fluorescence in situ hybridization (FISH), confirming the chromosome 3 assignment from somatic cell hybrid analysis.","method":"Fluorescence in situ hybridization (FISH); somatic cell hybrid panel Southern blotting","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cytogenetic localization by FISH, replicated prior somatic cell hybrid result with orthogonal method","pmids":["8244395"],"is_preprint":false},{"year":1994,"finding":"The human ACPP gene structure was determined to consist of protein-coding sequence interrupted by nine introns, with a total gene size exceeding 40 kb; seven Alu repeat elements are embedded in the genomic sequence, three immediately upstream of exon 1 and one in intron 1.","method":"Genomic cloning and nucleotide sequencing","journal":"Biochemistry and molecular biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct genomic sequencing establishing gene structure, single lab single method","pmids":["7951074"],"is_preprint":false},{"year":2025,"finding":"In MCF-7 breast cancer cells, transmembrane prostatic acid phosphatase (TM-PAP/ACP3) functions as an ectophosphatase capable of hydrolyzing p-nitrophenylphosphate (pNPP) and AMP at the cell surface; hypoxia significantly reduced this ectophosphatase activity, an effect mediated by hypoxia-induced reactive oxygen species (ROS, including H2O2) that inhibit TM-PAP, and reversed by ROS scavengers. Additionally, hypoxia-activated protein kinase C (PKC) further modulated TM-PAP ectophosphatase activity.","method":"Ectophosphatase activity assays with specific substrates (pNPP, AMP); ROS measurement; ROS scavenger rescue experiments; PKC inhibitor/activator assays in hypoxic vs. normoxic MCF-7 cells","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct enzymatic activity assays with substrate specificity, pharmacological rescue with ROS scavengers, and PKC modulation, single lab with multiple orthogonal approaches","pmids":["40076544"],"is_preprint":false}],"current_model":"Human ACP3 (prostatic acid phosphatase/TM-PAP) is a transmembrane ectophosphatase encoded by a >40 kb gene at chromosome 3q21–q23 containing nine introns and seven Alu repeats; at the cell surface it dephosphorylates substrates including pNPP and AMP, and its enzymatic activity is inhibited by hypoxia-induced ROS and modulated by protein kinase C activation."},"narrative":{"mechanistic_narrative":"ACP3 (ACPP) encodes prostatic acid phosphatase, which in its transmembrane form (TM-PAP) acts as a cell-surface ectophosphatase that hydrolyzes phosphate substrates including p-nitrophenylphosphate and AMP at the plasma membrane [PMID:40076544]. Its ectophosphatase activity is dynamically regulated: hypoxia suppresses activity through induced reactive oxygen species (including H2O2) that inhibit the enzyme and is rescued by ROS scavengers, while hypoxia-activated protein kinase C further modulates activity [PMID:40076544]. The gene maps to chromosome 3q21–q23, spans over 40 kb with nine introns, and contains seven embedded Alu repeat elements [PMID:2575485, PMID:8244395, PMID:7951074]. Beyond its ectophosphatase activity and its redox/PKC regulation [PMID:40076544], no further mechanistic detail on physiological substrates or signaling output has been characterized in the available corpus.","teleology":[{"year":1989,"claim":"Establishing the chromosomal location of the prostatic acid phosphatase gene was the first step toward defining the ACPP locus and its genetic variation.","evidence":"Southern blotting of human×rodent somatic cell hybrid panels with RFLP analysis","pmids":["2575485"],"confidence":"Medium","gaps":["Only coarse regional assignment (3q21–qter), not sub-band resolution","No gene structure or protein function addressed"]},{"year":1993,"claim":"Refining the map position sharpened the locus assignment and confirmed it with an orthogonal cytogenetic method, anchoring later genomic characterization.","evidence":"Fluorescence in situ hybridization plus somatic cell hybrid Southern blotting","pmids":["8244395"],"confidence":"Medium","gaps":["Localization only; no transcript or protein-level analysis","Functional role still undefined"]},{"year":1994,"claim":"Determining the exon–intron organization and repeat content provided the structural framework of the gene, showing a large multi-intron locus with embedded Alu elements.","evidence":"Genomic cloning and nucleotide sequencing of the human ACPP gene","pmids":["7951074"],"confidence":"Medium","gaps":["Does not address protein enzymatic function or regulation","Single lab, single sequencing approach"]},{"year":2025,"claim":"Demonstrating cell-surface phosphatase activity and its suppression by hypoxia-induced ROS and modulation by PKC defined a functional, regulated ectophosphatase role for TM-PAP in a non-prostatic cancer context.","evidence":"Ectophosphatase assays with pNPP/AMP, ROS measurement and scavenger rescue, and PKC inhibitor/activator assays in hypoxic vs normoxic MCF-7 cells","pmids":["40076544"],"confidence":"Medium","gaps":["Physiological substrates and downstream signaling output not identified","Mechanism of ROS-mediated inhibition (direct oxidation vs indirect) not resolved","Single cell line; in vivo relevance not established"]},{"year":null,"claim":"The physiological substrates, signaling consequences, and structural basis of ACP3/TM-PAP ectophosphatase regulation remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No physiological substrate beyond surrogate pNPP/AMP characterized","No structural model of the transmembrane enzyme","No defined disease mechanism in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]}],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15309","full_name":"Prostatic acid phosphatase","aliases":["5'-nucleotidase","5'-NT","Acid phosphatase 3","Ecto-5'-nucleotidase","Protein tyrosine phosphatase ACP3","Thiamine monophosphatase","TMPase"],"length_aa":386,"mass_kda":44.6,"function":"A non-specific tyrosine phosphatase that dephosphorylates a diverse number of substrates under acidic conditions (pH 4-6) including alkyl, aryl, and acyl orthophosphate monoesters and phosphorylated proteins (PubMed:10506173, PubMed:15280042, PubMed:20498373, PubMed:9584846). Has lipid phosphatase activity and inactivates lysophosphatidic acid in seminal plasma (PubMed:10506173, PubMed:15280042) Tyrosine phosphatase that acts as a tumor suppressor of prostate cancer through dephosphorylation of ERBB2 and deactivation of MAPK-mediated signaling (PubMed:20498373). In addition to its tyrosine phosphatase activity has ecto-5'-nucleotidase activity in dorsal root ganglion (DRG) neurons. Generates adenosine from AMP which acts as a pain suppressor (By similarity) (Microbial infection) Forms amyloid beta-sheet fibrils in semen. These fibrils, termed SEVI (semen-derived enhancer of viral infection) capture HIV virions, attach them to target cells and enhance infection (PubMed:18083097, PubMed:19451623, PubMed:19897482). SEVI amyloid fibrils are degraded by polyphenol epigallocatechin-3-gallate (EGCG), a constituent of green tea (PubMed:19451623). Target cell attachment and enhancement of HIV infection is inhibited by surfen (PubMed:19897482). Also similarly boosts XMRV (xenotropic murine leukemia virus-related virus) infection (PubMed:19403677)","subcellular_location":"Cell membrane; Lysosome membrane; Nucleus; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/P15309/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ACP3","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ACP3","total_profiled":1310},"omim":[{"mim_id":"621117","title":"DTW DOMAIN-CONTAINING PROTEIN 2; DTWD2","url":"https://www.omim.org/entry/621117"},{"mim_id":"621116","title":"DTW DOMAIN-CONTAINING PROTEIN 1; DTWD1","url":"https://www.omim.org/entry/621116"},{"mim_id":"171660","title":"PHOSPHATASE, ACID, OF TISSUES","url":"https://www.omim.org/entry/171660"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"prostate","ntpm":3409.5}],"url":"https://www.proteinatlas.org/search/ACP3"},"hgnc":{"alias_symbol":["ACP-3","PAP","TM-PAP"],"prev_symbol":["ACPP"]},"alphafold":{"accession":"P15309","domains":[{"cath_id":"3.40.50.1240","chopping":"35-159_255-371","consensus_level":"high","plddt":98.1482,"start":35,"end":371},{"cath_id":"-","chopping":"163-251","consensus_level":"medium","plddt":96.8442,"start":163,"end":251}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15309","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15309-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15309-F1-predicted_aligned_error_v6.png","plddt_mean":92.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ACP3","jax_strain_url":"https://www.jax.org/strain/search?query=ACP3"},"sequence":{"accession":"P15309","fasta_url":"https://rest.uniprot.org/uniprotkb/P15309.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15309/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15309"}},"corpus_meta":[{"pmid":"39173631","id":"PMC_39173631","title":"The modified RNA base acp3U is an attachment site for N-glycans in glycoRNA.","date":"2024","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/39173631","citation_count":91,"is_preprint":false},{"pmid":"32375039","id":"PMC_32375039","title":"Loss of m1acp3Ψ Ribosomal RNA Modification Is a Major Feature of Cancer.","date":"2020","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/32375039","citation_count":87,"is_preprint":false},{"pmid":"25443789","id":"PMC_25443789","title":"UPA-sensitive ACPP-conjugated nanoparticles for multi-targeting therapy of brain glioma.","date":"2015","source":"Biomaterials","url":"https://pubmed.ncbi.nlm.nih.gov/25443789","citation_count":47,"is_preprint":false},{"pmid":"33684286","id":"PMC_33684286","title":"Uptake, Stability, and Activity of Antisense Anti-acpP PNA-Peptide Conjugates in Escherichia coli and the Role of SbmA.","date":"2021","source":"ACS chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/33684286","citation_count":40,"is_preprint":false},{"pmid":"27381272","id":"PMC_27381272","title":"RpoS-dependent sRNA RgsA regulates Fis and AcpP in Pseudomonas aeruginosa.","date":"2016","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/27381272","citation_count":31,"is_preprint":false},{"pmid":"8550484","id":"PMC_8550484","title":"Isolation of Vibrio harveyi acyl carrier protein and the fabG, acpP, and fabF genes involved in fatty acid biosynthesis.","date":"1996","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/8550484","citation_count":27,"is_preprint":false},{"pmid":"33921011","id":"PMC_33921011","title":"Targeting of the Essential acpP, ftsZ, and rne Genes in Carbapenem-Resistant Acinetobacter baumannii by Antisense PNA Precision Antibacterials.","date":"2021","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/33921011","citation_count":22,"is_preprint":false},{"pmid":"30807888","id":"PMC_30807888","title":"Microwave-assisted solid-phase synthesis of antisense acpP peptide nucleic acid-peptide conjugates active against colistin- and tigecycline-resistant E. coli and K. pneumoniae.","date":"2019","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30807888","citation_count":20,"is_preprint":false},{"pmid":"2575485","id":"PMC_2575485","title":"Chromosomal localization to 3q21----qter and two TaqI RFLPs of the human prostate-specific acid phosphatase gene (ACPP).","date":"1989","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/2575485","citation_count":11,"is_preprint":false},{"pmid":"8244395","id":"PMC_8244395","title":"The prostatic acid phosphatase (ACPP) gene is localized to human chromosome 3q21-q23.","date":"1993","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/8244395","citation_count":10,"is_preprint":false},{"pmid":"25000246","id":"PMC_25000246","title":"The targeted transduction of MMP-overexpressing tumor cells by ACPP-HPMA copolymer-coated adenovirus conjugates.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25000246","citation_count":9,"is_preprint":false},{"pmid":"33894336","id":"PMC_33894336","title":"Silencing acpP gene via antisense oligonucleotide-niosome complex in clinical Pseudomonas aeruginosa isolates.","date":"2021","source":"Research in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33894336","citation_count":8,"is_preprint":false},{"pmid":"9787802","id":"PMC_9787802","title":"Genetic polymorphism of rabbit (Oryctolagus cuniculus) tissue acid phosphatases (ACP2 and ACP3).","date":"1998","source":"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9787802","citation_count":8,"is_preprint":false},{"pmid":"31552932","id":"PMC_31552932","title":"Synthesis of an acp3U phosphoramidite and incorporation of the hypermodified base into RNA.","date":"2019","source":"Chemical communications (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/31552932","citation_count":8,"is_preprint":false},{"pmid":"7951074","id":"PMC_7951074","title":"Nucleotide sequence of human prostatic acid phosphatase ACPP gene, including seven Alu repeats.","date":"1994","source":"Biochemistry and molecular biology international","url":"https://pubmed.ncbi.nlm.nih.gov/7951074","citation_count":8,"is_preprint":false},{"pmid":"39366345","id":"PMC_39366345","title":"50 years in the making: acp3U, an amino-acid-containing nucleoside, links N-glycans and RNA in glycoRNA.","date":"2024","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/39366345","citation_count":6,"is_preprint":false},{"pmid":"28083757","id":"PMC_28083757","title":"Finding Biomass Degrading Enzymes Through an Activity-Correlated Quantitative Proteomics Platform (ACPP).","date":"2017","source":"Journal of the American Society for Mass Spectrometry","url":"https://pubmed.ncbi.nlm.nih.gov/28083757","citation_count":3,"is_preprint":false},{"pmid":"27357282","id":"PMC_27357282","title":"Variants in ACPP are associated with cerebrospinal fluid Prostatic Acid Phosphatase levels.","date":"2016","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/27357282","citation_count":2,"is_preprint":false},{"pmid":"27467752","id":"PMC_27467752","title":"Structural analysis and interaction studies of acyl-carrier protein (acpP) of Staphylococcus aureus, an extraordinarily thermally stable protein.","date":"2017","source":"Biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27467752","citation_count":2,"is_preprint":false},{"pmid":"8760922","id":"PMC_8760922","title":"Acyl carrier protein of Azospirillum brasilense: properties of the purified protein and sequencing of the corresponding gene, acpP.","date":"1996","source":"Microbiology (Reading, England)","url":"https://pubmed.ncbi.nlm.nih.gov/8760922","citation_count":2,"is_preprint":false},{"pmid":"40076544","id":"PMC_40076544","title":"Hypoxia Modulates Transmembrane Prostatic Acid Phosphatase (TM-PAP) in MCF-7 Breast Cancer Cells.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40076544","citation_count":1,"is_preprint":false},{"pmid":"37184699","id":"PMC_37184699","title":"Using NMR Titration Experiments to Study E. coli FAS-II- and AcpP-Mediated Protein-Protein Interactions.","date":"2023","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/37184699","citation_count":0,"is_preprint":false},{"pmid":"39998218","id":"PMC_39998218","title":"Campylobacter jejuni resistance to human milk involves the acyl carrier protein AcpP.","date":"2025","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/39998218","citation_count":0,"is_preprint":false},{"pmid":"6995224","id":"PMC_6995224","title":"[Genetico-biochemical study of the acid phosphatases of Saccharomyces cerevisiae yeasts. X. Analysis of mutations arising in gene acp3].","date":"1980","source":"Genetika","url":"https://pubmed.ncbi.nlm.nih.gov/6995224","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.13.653872","title":"A novel non-catalytic function of PA2803-encoded PcrP contributes to polymyxin B resistance in P. aeruginosa and redefines the functional role of the PA2803 subfamily.","date":"2025-05-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.13.653872","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.07.658270","title":"<i>De novo</i>  acyl carrier proteins display structure-independent modification and sequence novelty","date":"2025-06-11","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.07.658270","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.31.634916","title":"Immunocompetent murine models recapitulate the heterogeneous tumor immune microenvironment of human liposarcoma","date":"2025-02-04","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.31.634916","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.22.666072","title":"Construction of a genome-wide pooled CRISPRi library as a resource for exploring the acid tolerance mechanism in  <i>Streptococcus mutans</i>","date":"2025-07-22","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.22.666072","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.24.613341","title":"Adaptation to high pressure; insights from the genome of an evolved  <i>Escherichia coli</i>  strain with increased piezotolerance","date":"2024-09-25","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.24.613341","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.29.620885","title":"A systematic identification of resistance determinants to antisense antibiotics suggests adaptation strategies dependent on the delivery peptide","date":"2024-10-29","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.29.620885","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16460,"output_tokens":1397,"usd":0.035167,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7609,"output_tokens":1544,"usd":0.038323,"stage2_stop_reason":"end_turn"},"total_usd":0.07349,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the papers, I need to identify which ones are about the canonical human ACP3/ACPP gene (prostatic acid phosphatase, also known as TM-PAP/ACPP) versus other genes that share similar symbols (like bacterial acpP = acyl carrier protein, or acp3 in yeast, or the acp3U RNA modification).\n\nThe human ACP3/ACPP gene encodes prostatic acid phosphatase (PAP). Papers about bacterial acpP (acyl carrier protein) are NOT the same gene — they are symbol collisions. Papers about acp3U (RNA modification) are also not this gene. Papers about yeast acp3 (acid phosphatase regulatory gene) are not orthologs of the mammalian prostatic acid phosphatase.\n\nRelevant papers for human ACP3/ACPP (prostatic acid phosphatase):\n- PMID:2575485 (chromosomal localization)\n- PMID:8244395 (chromosomal localization)\n- PMID:7951074 (gene structure)\n- PMID:27357282 (GWAS/CSF levels - mostly association, exclude)\n- PMID:40076544 (TM-PAP in MCF-7, hypoxia, ectophosphatase activity - mechanistic)\n\nPaper bio_10.1101_2025.01.31.634916 uses \"ACPP\" as a mouse model acronym (Adipocyte-specific Cre Plus Pten), not the gene - EXCLUDE.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"The human ACPP gene encoding prostatic acid phosphatase was chromosomally localized to segment 3q21–qter by Southern blotting analysis of human×rodent somatic cell hybrid panels, and two simultaneous diallelic TaqI RFLPs (A and B) were identified at this locus.\",\n      \"method\": \"Southern blotting of somatic cell hybrid panels; RFLP analysis\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic mapping by somatic cell hybrids with RFLP confirmation, single lab but two orthogonal methods\",\n      \"pmids\": [\"2575485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The ACPP gene encoding prostatic acid phosphatase was further sublocalized to chromosome 3q21–q23 by fluorescence in situ hybridization (FISH), confirming the chromosome 3 assignment from somatic cell hybrid analysis.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH); somatic cell hybrid panel Southern blotting\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cytogenetic localization by FISH, replicated prior somatic cell hybrid result with orthogonal method\",\n      \"pmids\": [\"8244395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The human ACPP gene structure was determined to consist of protein-coding sequence interrupted by nine introns, with a total gene size exceeding 40 kb; seven Alu repeat elements are embedded in the genomic sequence, three immediately upstream of exon 1 and one in intron 1.\",\n      \"method\": \"Genomic cloning and nucleotide sequencing\",\n      \"journal\": \"Biochemistry and molecular biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct genomic sequencing establishing gene structure, single lab single method\",\n      \"pmids\": [\"7951074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In MCF-7 breast cancer cells, transmembrane prostatic acid phosphatase (TM-PAP/ACP3) functions as an ectophosphatase capable of hydrolyzing p-nitrophenylphosphate (pNPP) and AMP at the cell surface; hypoxia significantly reduced this ectophosphatase activity, an effect mediated by hypoxia-induced reactive oxygen species (ROS, including H2O2) that inhibit TM-PAP, and reversed by ROS scavengers. Additionally, hypoxia-activated protein kinase C (PKC) further modulated TM-PAP ectophosphatase activity.\",\n      \"method\": \"Ectophosphatase activity assays with specific substrates (pNPP, AMP); ROS measurement; ROS scavenger rescue experiments; PKC inhibitor/activator assays in hypoxic vs. normoxic MCF-7 cells\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct enzymatic activity assays with substrate specificity, pharmacological rescue with ROS scavengers, and PKC modulation, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"40076544\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human ACP3 (prostatic acid phosphatase/TM-PAP) is a transmembrane ectophosphatase encoded by a >40 kb gene at chromosome 3q21–q23 containing nine introns and seven Alu repeats; at the cell surface it dephosphorylates substrates including pNPP and AMP, and its enzymatic activity is inhibited by hypoxia-induced ROS and modulated by protein kinase C activation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ACP3 (ACPP) encodes prostatic acid phosphatase, which in its transmembrane form (TM-PAP) acts as a cell-surface ectophosphatase that hydrolyzes phosphate substrates including p-nitrophenylphosphate and AMP at the plasma membrane [#3]. Its ectophosphatase activity is dynamically regulated: hypoxia suppresses activity through induced reactive oxygen species (including H2O2) that inhibit the enzyme and is rescued by ROS scavengers, while hypoxia-activated protein kinase C further modulates activity [#3]. The gene maps to chromosome 3q21\\u2013q23, spans over 40 kb with nine introns, and contains seven embedded Alu repeat elements [#0, #1, #2]. Beyond its ectophosphatase activity and its redox/PKC regulation [#3], no further mechanistic detail on physiological substrates or signaling output has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing the chromosomal location of the prostatic acid phosphatase gene was the first step toward defining the ACPP locus and its genetic variation.\",\n      \"evidence\": \"Southern blotting of human\\u00d7rodent somatic cell hybrid panels with RFLP analysis\",\n      \"pmids\": [\"2575485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Only coarse regional assignment (3q21\\u2013qter), not sub-band resolution\",\n        \"No gene structure or protein function addressed\"\n      ]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Refining the map position sharpened the locus assignment and confirmed it with an orthogonal cytogenetic method, anchoring later genomic characterization.\",\n      \"evidence\": \"Fluorescence in situ hybridization plus somatic cell hybrid Southern blotting\",\n      \"pmids\": [\"8244395\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Localization only; no transcript or protein-level analysis\",\n        \"Functional role still undefined\"\n      ]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Determining the exon\\u2013intron organization and repeat content provided the structural framework of the gene, showing a large multi-intron locus with embedded Alu elements.\",\n      \"evidence\": \"Genomic cloning and nucleotide sequencing of the human ACPP gene\",\n      \"pmids\": [\"7951074\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not address protein enzymatic function or regulation\",\n        \"Single lab, single sequencing approach\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating cell-surface phosphatase activity and its suppression by hypoxia-induced ROS and modulation by PKC defined a functional, regulated ectophosphatase role for TM-PAP in a non-prostatic cancer context.\",\n      \"evidence\": \"Ectophosphatase assays with pNPP/AMP, ROS measurement and scavenger rescue, and PKC inhibitor/activator assays in hypoxic vs normoxic MCF-7 cells\",\n      \"pmids\": [\"40076544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Physiological substrates and downstream signaling output not identified\",\n        \"Mechanism of ROS-mediated inhibition (direct oxidation vs indirect) not resolved\",\n        \"Single cell line; in vivo relevance not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological substrates, signaling consequences, and structural basis of ACP3/TM-PAP ectophosphatase regulation remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No physiological substrate beyond surrogate pNPP/AMP characterized\",\n        \"No structural model of the transmembrane enzyme\",\n        \"No defined disease mechanism in the corpus\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":3,"faith_total":3,"faith_pct":100.0}}