{"gene":"PCNP","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2002,"finding":"PCNP (PEST-containing nuclear protein) interacts with NIRF (a novel Np95/ICBP90-like RING finger protein) as identified by yeast two-hybrid screening, confirmed by mammalian two-hybrid system, GST pull-down assay, and nuclear co-localization.","method":"Yeast two-hybrid screening, mammalian two-hybrid assay, GST pull-down, nuclear co-localization","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — three orthogonal methods (yeast two-hybrid, GST pulldown, co-localization) in a single study, independently confirmed in subsequent work","pmids":["12176013"],"is_preprint":false},{"year":2004,"finding":"NIRF ubiquitinates PCNP both in vitro and in vivo (in 293 and COS-7 cells), establishing NIRF as an E3 ubiquitin ligase with PCNP as its substrate. NIRF also displays auto-ubiquitination activity.","method":"In vitro ubiquitination assay, in vivo ubiquitination in 293 and COS-7 cells","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of ubiquitination plus in vivo confirmation in two cell lines, replicated across studies","pmids":["14741369"],"is_preprint":false},{"year":2010,"finding":"HYPK is required for N-terminal acetylation of PCNP, a known NatA substrate, as demonstrated by HYPK knockdown reducing PCNP acetylation. This establishes PCNP as a cotranslational N-terminal acetylation substrate of the NatA complex.","method":"siRNA knockdown of HYPK with NatA substrate acetylation assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with defined biochemical readout in single lab; PCNP acetylation is a secondary finding within a broader NatA/HYPK study","pmids":["20154145"],"is_preprint":false},{"year":2018,"finding":"PCNP overexpression in human neuroblastoma cells increases phosphorylation of ERK1/2, p38, and JNK (MAPK pathway) while decreasing phosphorylation of PI3K, Akt, and mTOR, mediating inhibition of proliferation, migration, and invasion. PCNP knockdown shows opposite effects. PCNP overexpression also activates caspase-3, -8, -9, and PARP cleavage, promoting apoptosis.","method":"shRNA knockdown and overexpression, Western blotting for pathway markers, xenograft tumor assay","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional perturbation (KD and OE) with defined pathway readouts and in vivo xenograft, single lab","pmids":["29716528"],"is_preprint":false},{"year":2019,"finding":"PCNP overexpression in lung adenocarcinoma cells activates STAT3 and STAT5 phosphorylation and promotes PI3K/Akt/mTOR signaling (increased p-PI3K, p-Akt, p-mTOR), enhancing autophagy and reducing apoptosis; PCNP knockdown reverses these effects.","method":"shRNA knockdown and overexpression, Western blotting, xenograft tumor assay","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional perturbation with pathway-specific markers and in vivo validation, single lab","pmids":["30872582"],"is_preprint":false},{"year":2020,"finding":"PCNP binds directly to β-catenin and promotes its nuclear translocation, thereby activating Wnt/β-catenin signaling, which promotes ovarian cancer cell proliferation, migration, invasion, and epithelial-to-mesenchymal transition (EMT).","method":"Co-immunoprecipitation, Western blotting, nuclear fractionation, shRNA knockdown and overexpression","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP for binding, bidirectional perturbation for function, single lab","pmids":["32548978"],"is_preprint":false},{"year":2022,"finding":"LINC00858 recruits the transcription factor RAD21 to the PCNP promoter region, upregulating PCNP expression, which in turn activates STAT3/5 phosphorylation to promote colon cancer cell proliferation; silencing RAD21 or PCNP reverses these effects.","method":"RNA pull-down, RIP, ChIP, siRNA knockdown, Western blotting, xenograft tumor model","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and RIP confirm direct promoter recruitment, functional rescue with downstream STAT3/5 inhibition, single lab","pmids":["35468892"],"is_preprint":false},{"year":2022,"finding":"PCNP overexpression in thyroid cancer cells reduces proliferation, migration, and invasion, induces cell cycle arrest by modifying cell cycle regulatory gene expression, promotes apoptosis via ERK/JNK/p38 activation, and promotes autophagy by reducing Wnt/β-catenin pathway activity; knockdown shows opposite effects.","method":"shRNA knockdown and overexpression, Western blotting, cell cycle analysis, xenograft tumor assay","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional perturbation with pathway-specific markers and in vivo validation, single lab","pmids":["35813472"],"is_preprint":false},{"year":2025,"finding":"PCNP transcriptionally upregulates UHRF2 expression; ectopic PCNP overexpression activates the ErbB3/Ras/Raf1 signaling pathway through UHRF2 upregulation, promoting hepatocellular carcinoma cell proliferation, invasion, and tumor formation in vivo.","method":"Pearson correlation analysis, Western blotting, shRNA knockdown and overexpression, in vitro proliferation/invasion assays, xenograft tumor model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional perturbation, pathway marker analysis, in vivo xenograft, single lab","pmids":["41271959"],"is_preprint":false},{"year":2025,"finding":"PCNP overexpression in HUVECs inhibits endothelial cell proliferation, migration, and tube formation (angiogenesis), while PCNP knockdown promotes these processes. Transcriptome analysis reveals enrichment of inflammatory signaling pathways (IL-17, TNF, NF-κB) in PCNP-overexpressing cells. The mechanism does not involve direct modulation of intracellular VEGF levels.","method":"Overexpression and shRNA knockdown, CCK-8 proliferation assay, wound healing assay, tube formation assay, ELISA, Western blot, transcriptome sequencing","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional perturbation with multiple orthogonal functional readouts and transcriptome analysis, single lab","pmids":["41381593"],"is_preprint":false}],"current_model":"PCNP is a short-lived PEST-containing nuclear protein that is cotranslationally N-terminally acetylated by the NatA complex (facilitated by HYPK) and ubiquitinated by the E3 ligase NIRF; it interacts with β-catenin to promote its nuclear translocation and Wnt/β-catenin signaling, modulates MAPK (ERK/JNK/p38) and PI3K/Akt/mTOR/STAT3/5 signaling pathways, transcriptionally upregulates UHRF2 to activate ErbB3/Ras/Raf signaling, and functions as a negative regulator of angiogenesis in endothelial cells, with its expression in turn regulated transcriptionally via LINC00858-recruited RAD21 binding to its promoter."},"narrative":{"mechanistic_narrative":"PCNP is a short-lived PEST-containing nuclear protein that functions as a context-dependent modulator of major proliferative and survival signaling pathways and, in turn, of cell proliferation, migration, invasion, apoptosis, and angiogenesis [PMID:29716528, PMID:41381593]. Its abundance is set post-translationally: PCNP is a cotranslational N-terminal acetylation substrate of the NatA complex, a modification dependent on the chaperone HYPK [PMID:20154145], and it is ubiquitinated by the RING-finger E3 ligase NIRF, with which it physically interacts in the nucleus [PMID:12176013, PMID:14741369]. Functionally, PCNP engages canonical growth-control circuits — it binds β-catenin directly to drive its nuclear translocation and activate Wnt/β-catenin signaling [PMID:32548978], shifts the balance of MAPK (ERK/JNK/p38) versus PI3K/Akt/mTOR and STAT3/5 signaling in a cell-type-dependent manner [PMID:29716528, PMID:30872582, PMID:35813472], and transcriptionally upregulates UHRF2 to engage ErbB3/Ras/Raf1 signaling [PMID:41271959]. PCNP expression is itself induced when LINC00858 recruits RAD21 to its promoter [PMID:35468892], and overexpressed PCNP acts as a negative regulator of endothelial angiogenesis independent of intracellular VEGF levels [PMID:41381593]. No structural model or catalytic activity for PCNP itself has been characterized in the available corpus; its described roles are those of a regulatory adaptor and transcriptional modulator.","teleology":[{"year":2002,"claim":"Established the first molecular partner of PCNP, linking this nuclear protein to a RING-finger protein and implying involvement in ubiquitin-related regulation.","evidence":"Yeast and mammalian two-hybrid, GST pull-down, and nuclear co-localization with NIRF","pmids":["12176013"],"confidence":"High","gaps":["Did not define which domain or residues mediate the PCNP-NIRF interaction","Functional consequence of the interaction not yet addressed"]},{"year":2004,"claim":"Resolved the functional meaning of the PCNP-NIRF interaction by showing NIRF is an E3 ligase that ubiquitinates PCNP, explaining its short half-life.","evidence":"In vitro ubiquitination reconstitution plus in vivo ubiquitination in 293 and COS-7 cells","pmids":["14741369"],"confidence":"High","gaps":["Did not establish whether ubiquitination targets PCNP for degradation versus non-degradative signaling","Lysine acceptor sites on PCNP not mapped"]},{"year":2010,"claim":"Defined a co-translational modification of PCNP, showing it is N-terminally acetylated by NatA in a HYPK-dependent manner.","evidence":"siRNA knockdown of HYPK with NatA substrate acetylation readout","pmids":["20154145"],"confidence":"Medium","gaps":["PCNP is a secondary substrate within a broader NatA/HYPK study","Functional consequence of PCNP N-terminal acetylation not tested"]},{"year":2018,"claim":"Moved PCNP from a binding partner to a signaling modulator, showing it bidirectionally tunes MAPK versus PI3K/Akt/mTOR signaling and apoptosis to suppress neuroblastoma growth.","evidence":"shRNA knockdown and overexpression with pathway Western blots and xenograft in neuroblastoma cells","pmids":["29716528"],"confidence":"Medium","gaps":["Direct molecular link between PCNP and the kinases is not defined","Single tumor type and single lab"]},{"year":2019,"claim":"Revealed cell-type dependence of PCNP signaling output, with PCNP activating STAT3/5 and PI3K/Akt/mTOR to favor autophagy and survival in lung adenocarcinoma.","evidence":"shRNA knockdown and overexpression, Western blotting, xenograft in lung adenocarcinoma cells","pmids":["30872582"],"confidence":"Medium","gaps":["Opposite pathway effect versus neuroblastoma unexplained mechanistically","No direct binding to STAT or PI3K components shown"]},{"year":2020,"claim":"Provided a direct molecular mechanism for PCNP's effect on Wnt signaling by showing it binds β-catenin and promotes its nuclear translocation.","evidence":"Co-immunoprecipitation, nuclear fractionation, bidirectional perturbation in ovarian cancer cells","pmids":["32548978"],"confidence":"Medium","gaps":["Co-IP without reciprocal or structural validation of the interaction interface","How PCNP promotes translocation mechanistically not resolved"]},{"year":2022,"claim":"Identified an upstream transcriptional control of PCNP, showing LINC00858 recruits RAD21 to the PCNP promoter to drive its expression and downstream STAT3/5 activation.","evidence":"RNA pull-down, RIP, ChIP, siRNA, and xenograft in colon cancer cells","pmids":["35468892"],"confidence":"Medium","gaps":["Whether RAD21 directly activates transcription or acts via chromatin architecture not distinguished","Single tumor context"]},{"year":2022,"claim":"Extended PCNP's tumor-suppressive signaling profile, linking ERK/JNK/p38 activation and reduced Wnt/β-catenin activity to cell cycle arrest, apoptosis, and autophagy in thyroid cancer.","evidence":"shRNA knockdown and overexpression, cell cycle analysis, Western blotting, xenograft in thyroid cancer cells","pmids":["35813472"],"confidence":"Medium","gaps":["Identity of the cell cycle regulatory genes modified not fully resolved","Direct effectors downstream of PCNP not defined"]},{"year":2025,"claim":"Provided a transcriptional/effector mechanism for PCNP's oncogenic output by showing it upregulates UHRF2 to activate ErbB3/Ras/Raf1 signaling in hepatocellular carcinoma.","evidence":"Correlation analysis, bidirectional perturbation, proliferation/invasion assays, xenograft","pmids":["41271959"],"confidence":"Medium","gaps":["Mechanism by which PCNP upregulates UHRF2 transcription not defined","Whether PCNP binds the UHRF2 locus directly unknown"]},{"year":2025,"claim":"Identified a non-tumor role for PCNP as a negative regulator of endothelial angiogenesis acting independently of intracellular VEGF.","evidence":"Overexpression and knockdown, proliferation/migration/tube-formation assays, transcriptome sequencing in HUVECs","pmids":["41381593"],"confidence":"Medium","gaps":["Effector linking PCNP to inflammatory IL-17/TNF/NF-κB enrichment not identified","VEGF-independent mechanism not positively defined"]},{"year":null,"claim":"The intrinsic biochemical activity of PCNP and the molecular basis for its opposite, cell-type-dependent signaling outputs remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No catalytic activity or structural domain function defined for PCNP itself","Mechanism switching PCNP between tumor-suppressive and oncogenic signaling across tissues unknown","Functional consequences of NatA acetylation and NIRF ubiquitination on PCNP signaling untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,8]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,4,5]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,5,7,8]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2]}],"complexes":[],"partners":["NIRF","CTNNB1","HYPK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WW12","full_name":"PEST proteolytic signal-containing nuclear protein","aliases":[],"length_aa":178,"mass_kda":18.9,"function":"May be involved in cell cycle regulation","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8WW12/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PCNP","classification":"Not Classified","n_dependent_lines":163,"n_total_lines":1208,"dependency_fraction":0.13493377483443708},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RBM17","stoichiometry":4.0},{"gene":"SF3A2","stoichiometry":4.0},{"gene":"SF3B1","stoichiometry":4.0},{"gene":"SF3B6","stoichiometry":4.0},{"gene":"BPNT1","stoichiometry":0.2},{"gene":"RBM39","stoichiometry":0.2},{"gene":"SF3A1","stoichiometry":0.2},{"gene":"SNRPB","stoichiometry":0.2},{"gene":"SNRPB2","stoichiometry":0.2},{"gene":"SNRPD2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PCNP","total_profiled":1310},"omim":[{"mim_id":"615211","title":"UBIQUITIN-LIKE PROTEIN CONTAINING PHD AND RING FINGER DOMAINS 2, E3 UBIQUITIN PROTEIN LIGASE; UHRF2","url":"https://www.omim.org/entry/615211"},{"mim_id":"615210","title":"PEST-CONTAINING NUCLEAR PROTEIN; PCNP","url":"https://www.omim.org/entry/615210"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Nuclear bodies","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PCNP"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q8WW12","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WW12","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WW12-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WW12-F1-predicted_aligned_error_v6.png","plddt_mean":62.78},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PCNP","jax_strain_url":"https://www.jax.org/strain/search?query=PCNP"},"sequence":{"accession":"Q8WW12","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WW12.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WW12/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WW12"}},"corpus_meta":[{"pmid":"20154145","id":"PMC_20154145","title":"The chaperone-like protein HYPK acts together with NatA in cotranslational N-terminal acetylation and prevention of Huntingtin 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NIRF also displays auto-ubiquitination activity.\",\n      \"method\": \"In vitro ubiquitination assay, in vivo ubiquitination in 293 and COS-7 cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of ubiquitination plus in vivo confirmation in two cell lines, replicated across studies\",\n      \"pmids\": [\"14741369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HYPK is required for N-terminal acetylation of PCNP, a known NatA substrate, as demonstrated by HYPK knockdown reducing PCNP acetylation. This establishes PCNP as a cotranslational N-terminal acetylation substrate of the NatA complex.\",\n      \"method\": \"siRNA knockdown of HYPK with NatA substrate acetylation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with defined biochemical readout in single lab; PCNP acetylation is a secondary finding within a broader NatA/HYPK study\",\n      \"pmids\": [\"20154145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PCNP overexpression in human neuroblastoma cells increases phosphorylation of ERK1/2, p38, and JNK (MAPK pathway) while decreasing phosphorylation of PI3K, Akt, and mTOR, mediating inhibition of proliferation, migration, and invasion. PCNP knockdown shows opposite effects. PCNP overexpression also activates caspase-3, -8, -9, and PARP cleavage, promoting apoptosis.\",\n      \"method\": \"shRNA knockdown and overexpression, Western blotting for pathway markers, xenograft tumor assay\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional perturbation (KD and OE) with defined pathway readouts and in vivo xenograft, single lab\",\n      \"pmids\": [\"29716528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PCNP overexpression in lung adenocarcinoma cells activates STAT3 and STAT5 phosphorylation and promotes PI3K/Akt/mTOR signaling (increased p-PI3K, p-Akt, p-mTOR), enhancing autophagy and reducing apoptosis; PCNP knockdown reverses these effects.\",\n      \"method\": \"shRNA knockdown and overexpression, Western blotting, xenograft tumor assay\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional perturbation with pathway-specific markers and in vivo validation, single lab\",\n      \"pmids\": [\"30872582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCNP binds directly to β-catenin and promotes its nuclear translocation, thereby activating Wnt/β-catenin signaling, which promotes ovarian cancer cell proliferation, migration, invasion, and epithelial-to-mesenchymal transition (EMT).\",\n      \"method\": \"Co-immunoprecipitation, Western blotting, nuclear fractionation, shRNA knockdown and overexpression\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP for binding, bidirectional perturbation for function, single lab\",\n      \"pmids\": [\"32548978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LINC00858 recruits the transcription factor RAD21 to the PCNP promoter region, upregulating PCNP expression, which in turn activates STAT3/5 phosphorylation to promote colon cancer cell proliferation; silencing RAD21 or PCNP reverses these effects.\",\n      \"method\": \"RNA pull-down, RIP, ChIP, siRNA knockdown, Western blotting, xenograft tumor model\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and RIP confirm direct promoter recruitment, functional rescue with downstream STAT3/5 inhibition, single lab\",\n      \"pmids\": [\"35468892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PCNP overexpression in thyroid cancer cells reduces proliferation, migration, and invasion, induces cell cycle arrest by modifying cell cycle regulatory gene expression, promotes apoptosis via ERK/JNK/p38 activation, and promotes autophagy by reducing Wnt/β-catenin pathway activity; knockdown shows opposite effects.\",\n      \"method\": \"shRNA knockdown and overexpression, Western blotting, cell cycle analysis, xenograft tumor assay\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional perturbation with pathway-specific markers and in vivo validation, single lab\",\n      \"pmids\": [\"35813472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCNP transcriptionally upregulates UHRF2 expression; ectopic PCNP overexpression activates the ErbB3/Ras/Raf1 signaling pathway through UHRF2 upregulation, promoting hepatocellular carcinoma cell proliferation, invasion, and tumor formation in vivo.\",\n      \"method\": \"Pearson correlation analysis, Western blotting, shRNA knockdown and overexpression, in vitro proliferation/invasion assays, xenograft tumor model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional perturbation, pathway marker analysis, in vivo xenograft, single lab\",\n      \"pmids\": [\"41271959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCNP overexpression in HUVECs inhibits endothelial cell proliferation, migration, and tube formation (angiogenesis), while PCNP knockdown promotes these processes. Transcriptome analysis reveals enrichment of inflammatory signaling pathways (IL-17, TNF, NF-κB) in PCNP-overexpressing cells. The mechanism does not involve direct modulation of intracellular VEGF levels.\",\n      \"method\": \"Overexpression and shRNA knockdown, CCK-8 proliferation assay, wound healing assay, tube formation assay, ELISA, Western blot, transcriptome sequencing\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional perturbation with multiple orthogonal functional readouts and transcriptome analysis, single lab\",\n      \"pmids\": [\"41381593\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PCNP is a short-lived PEST-containing nuclear protein that is cotranslationally N-terminally acetylated by the NatA complex (facilitated by HYPK) and ubiquitinated by the E3 ligase NIRF; it interacts with β-catenin to promote its nuclear translocation and Wnt/β-catenin signaling, modulates MAPK (ERK/JNK/p38) and PI3K/Akt/mTOR/STAT3/5 signaling pathways, transcriptionally upregulates UHRF2 to activate ErbB3/Ras/Raf signaling, and functions as a negative regulator of angiogenesis in endothelial cells, with its expression in turn regulated transcriptionally via LINC00858-recruited RAD21 binding to its promoter.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PCNP is a short-lived PEST-containing nuclear protein that functions as a context-dependent modulator of major proliferative and survival signaling pathways and, in turn, of cell proliferation, migration, invasion, apoptosis, and angiogenesis [#3, #9]. Its abundance is set post-translationally: PCNP is a cotranslational N-terminal acetylation substrate of the NatA complex, a modification dependent on the chaperone HYPK [#2], and it is ubiquitinated by the RING-finger E3 ligase NIRF, with which it physically interacts in the nucleus [#0, #1]. Functionally, PCNP engages canonical growth-control circuits — it binds β-catenin directly to drive its nuclear translocation and activate Wnt/β-catenin signaling [#5], shifts the balance of MAPK (ERK/JNK/p38) versus PI3K/Akt/mTOR and STAT3/5 signaling in a cell-type-dependent manner [#3, #4, #7], and transcriptionally upregulates UHRF2 to engage ErbB3/Ras/Raf1 signaling [#8]. PCNP expression is itself induced when LINC00858 recruits RAD21 to its promoter [#6], and overexpressed PCNP acts as a negative regulator of endothelial angiogenesis independent of intracellular VEGF levels [#9]. No structural model or catalytic activity for PCNP itself has been characterized in the available corpus; its described roles are those of a regulatory adaptor and transcriptional modulator.\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the first molecular partner of PCNP, linking this nuclear protein to a RING-finger protein and implying involvement in ubiquitin-related regulation.\",\n      \"evidence\": \"Yeast and mammalian two-hybrid, GST pull-down, and nuclear co-localization with NIRF\",\n      \"pmids\": [\"12176013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which domain or residues mediate the PCNP-NIRF interaction\", \"Functional consequence of the interaction not yet addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the functional meaning of the PCNP-NIRF interaction by showing NIRF is an E3 ligase that ubiquitinates PCNP, explaining its short half-life.\",\n      \"evidence\": \"In vitro ubiquitination reconstitution plus in vivo ubiquitination in 293 and COS-7 cells\",\n      \"pmids\": [\"14741369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether ubiquitination targets PCNP for degradation versus non-degradative signaling\", \"Lysine acceptor sites on PCNP not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a co-translational modification of PCNP, showing it is N-terminally acetylated by NatA in a HYPK-dependent manner.\",\n      \"evidence\": \"siRNA knockdown of HYPK with NatA substrate acetylation readout\",\n      \"pmids\": [\"20154145\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PCNP is a secondary substrate within a broader NatA/HYPK study\", \"Functional consequence of PCNP N-terminal acetylation not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Moved PCNP from a binding partner to a signaling modulator, showing it bidirectionally tunes MAPK versus PI3K/Akt/mTOR signaling and apoptosis to suppress neuroblastoma growth.\",\n      \"evidence\": \"shRNA knockdown and overexpression with pathway Western blots and xenograft in neuroblastoma cells\",\n      \"pmids\": [\"29716528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between PCNP and the kinases is not defined\", \"Single tumor type and single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed cell-type dependence of PCNP signaling output, with PCNP activating STAT3/5 and PI3K/Akt/mTOR to favor autophagy and survival in lung adenocarcinoma.\",\n      \"evidence\": \"shRNA knockdown and overexpression, Western blotting, xenograft in lung adenocarcinoma cells\",\n      \"pmids\": [\"30872582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposite pathway effect versus neuroblastoma unexplained mechanistically\", \"No direct binding to STAT or PI3K components shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided a direct molecular mechanism for PCNP's effect on Wnt signaling by showing it binds β-catenin and promotes its nuclear translocation.\",\n      \"evidence\": \"Co-immunoprecipitation, nuclear fractionation, bidirectional perturbation in ovarian cancer cells\",\n      \"pmids\": [\"32548978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-IP without reciprocal or structural validation of the interaction interface\", \"How PCNP promotes translocation mechanistically not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified an upstream transcriptional control of PCNP, showing LINC00858 recruits RAD21 to the PCNP promoter to drive its expression and downstream STAT3/5 activation.\",\n      \"evidence\": \"RNA pull-down, RIP, ChIP, siRNA, and xenograft in colon cancer cells\",\n      \"pmids\": [\"35468892\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAD21 directly activates transcription or acts via chromatin architecture not distinguished\", \"Single tumor context\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended PCNP's tumor-suppressive signaling profile, linking ERK/JNK/p38 activation and reduced Wnt/β-catenin activity to cell cycle arrest, apoptosis, and autophagy in thyroid cancer.\",\n      \"evidence\": \"shRNA knockdown and overexpression, cell cycle analysis, Western blotting, xenograft in thyroid cancer cells\",\n      \"pmids\": [\"35813472\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the cell cycle regulatory genes modified not fully resolved\", \"Direct effectors downstream of PCNP not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided a transcriptional/effector mechanism for PCNP's oncogenic output by showing it upregulates UHRF2 to activate ErbB3/Ras/Raf1 signaling in hepatocellular carcinoma.\",\n      \"evidence\": \"Correlation analysis, bidirectional perturbation, proliferation/invasion assays, xenograft\",\n      \"pmids\": [\"41271959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which PCNP upregulates UHRF2 transcription not defined\", \"Whether PCNP binds the UHRF2 locus directly unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a non-tumor role for PCNP as a negative regulator of endothelial angiogenesis acting independently of intracellular VEGF.\",\n      \"evidence\": \"Overexpression and knockdown, proliferation/migration/tube-formation assays, transcriptome sequencing in HUVECs\",\n      \"pmids\": [\"41381593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effector linking PCNP to inflammatory IL-17/TNF/NF-κB enrichment not identified\", \"VEGF-independent mechanism not positively defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The intrinsic biochemical activity of PCNP and the molecular basis for its opposite, cell-type-dependent signaling outputs remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No catalytic activity or structural domain function defined for PCNP itself\", \"Mechanism switching PCNP between tumor-suppressive and oncogenic signaling across tissues unknown\", \"Functional consequences of NatA acetylation and NIRF ubiquitination on PCNP signaling untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 5, 7, 8]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"NIRF\",\n      \"CTNNB1\",\n      \"HYPK\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":4,"faith_total":4,"faith_pct":100.0}}