{"gene":"PKIB","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2000,"finding":"Human PKIB was cloned and found to encode a protein with 70% identity to mouse PKIβ, containing both a pseudosubstrate site and a leucine-rich nuclear export signal motif, establishing it as a member of the cAMP-dependent protein kinase inhibitor (PKI) family.","method":"cDNA cloning, sequence analysis, Northern blot","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cloning with sequence/domain validation and tissue expression characterization, single lab","pmids":["10880337"],"is_preprint":false},{"year":2009,"finding":"PKIB directly interacts with the cAMP-dependent protein kinase A catalytic subunit (PKA-C), and knockdown of PKIB in prostate cancer cells diminishes nuclear translocation of PKA-C, placing PKIB as a regulator of PKA-C subcellular localization.","method":"Co-immunoprecipitation, siRNA knockdown, subcellular fractionation/imaging","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction demonstrated by Co-IP plus functional localization readout, single lab with multiple methods","pmids":["19483721"],"is_preprint":false},{"year":2009,"finding":"PKIB enhances phosphorylation of Akt at Ser473 by PKA-C: in vitro kinase assay showed recombinant PKIB enhanced PKA-C-mediated phosphorylation of Akt at Ser473, and siRNA knockdown of PKIB decreased Akt Ser473 phosphorylation in prostate cancer cells.","method":"In vitro kinase assay with recombinant proteins, siRNA knockdown + western blot","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cellular knockdown validation, two orthogonal methods, single lab","pmids":["19483721"],"is_preprint":false},{"year":2014,"finding":"PKIB interacts with the cytosolic C-terminus of the G-protein-coupled zinc receptor GPR39 (identified by yeast-2-hybrid screen and co-expression studies), and this interaction enhances GPR39's constitutive protective activity via the Gα13/RhoA/SRE pathway but not the zinc-dependent (ligand-mediated) pathway.","method":"Yeast two-hybrid screen, co-expression functional assay, SRE-reporter assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Y2H plus functional co-expression assay, single lab, two orthogonal methods","pmids":["24869658"],"is_preprint":false},{"year":2014,"finding":"Mutation of the pseudosubstrate domain of PKIB abolished its inhibitory activity on PKA but had no effect on its interaction with GPR39, cell protection, or SRE-dependent transcription induction, demonstrating that PKIB's interaction with GPR39 is independent of its PKA-inhibitory pseudosubstrate domain.","method":"Site-directed mutagenesis, co-expression functional assay, SRE-reporter assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with functional validation, single lab","pmids":["24869658"],"is_preprint":false},{"year":2014,"finding":"Zinc causes dissociation of PKIB from GPR39, liberating PKIB to associate with PKA and inhibit its activity, establishing a negative-feedback loop that limits zinc-induced Gs pathway activation.","method":"Co-expression, zinc treatment, functional reporter assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assay demonstrating ligand-regulated dissociation and downstream PKA inhibition, single lab","pmids":["24869658"],"is_preprint":false},{"year":2015,"finding":"Chronic hyperglycemia activates HIF1-dependent induction of PKIB in pancreatic islets; PKIB acts as a potent inhibitor of PKA catalytic activity in beta cells, and disruption of the PKIB gene improved islet function in obese mice, placing PKIB downstream of HIF1 in a feedback pathway that disrupts cAMP/PKA signaling.","method":"Genetic knockout (PKIB gene disruption in mice), glucose tolerance testing, molecular pathway analysis in islets","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic knockout with functional metabolic phenotype, pathway epistasis established, single lab","pmids":["25704817"],"is_preprint":false},{"year":2016,"finding":"PKIB promotes cell proliferation and invasion/migration in NSCLC cells, and all these effects are abolished by inhibiting the PI3K/Akt pathway, placing PKIB functionally upstream of PI3K/Akt in NSCLC.","method":"Overexpression/knockdown, MTT/BrdU proliferation assays, migration/invasion assays, PI3K inhibitor rescue experiment, western blot","journal":"Experimental biology and medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with pathway inhibitor rescue, multiple phenotypic readouts, single lab","pmids":["27325557"],"is_preprint":false},{"year":2020,"finding":"Knockdown of PKIB in trophoblast cells decreases phosphorylated Akt and downstream proteins (MMP2, MMP9, GSK3β), and inhibits migration, invasion, and vessel formation, establishing that PKIB supports trophoblast invasiveness via the Akt signaling pathway.","method":"siRNA knockdown, real-time cell analysis, tube formation/spheroid sprouting assay, western blot","journal":"Reproductive sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with multiple functional assays and downstream pathway analysis, single lab","pmids":["32676926"],"is_preprint":false},{"year":2024,"finding":"GR activation following androgen receptor signaling inhibition upregulates PKIB mRNA and protein in prostate cancer cells, leading to nuclear accumulation of PKA catalytic subunit (PKA-c) and increased CREB phosphorylation and activity.","method":"RNA-seq, western blot, nuclear fractionation, CREB phosphorylation assay in CRPC model systems and xenografts","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cellular and in vivo models, multiple readouts, single lab","pmids":["38030378"],"is_preprint":false},{"year":2025,"finding":"PKIB disrupts PKA kinase activity, resulting in diminished phosphorylation of HSP27 at serine residues 15, 78, and 82; this mechanism promotes bladder cancer proliferation, migration, and invasion. The transcription factor MYCN binds the PKIB promoter and drives its expression in bladder cancer.","method":"In vitro functional assays (proliferation, migration, invasion), in vivo xenograft, western blot for HSP27 phosphorylation, ChIP for MYCN binding to PKIB promoter","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway demonstrated with substrate identification, ChIP for upstream regulator, in vivo validation, single lab","pmids":["40593489"],"is_preprint":false}],"current_model":"PKIB is an endogenous inhibitor of the cAMP-dependent protein kinase A catalytic subunit (PKA-C) that directly binds PKA-C via a pseudosubstrate domain, blocks PKA activity (reducing substrate phosphorylation such as HSP27), controls PKA-C nuclear translocation, and paradoxically also promotes Akt Ser473 phosphorylation via a PKA-C-dependent mechanism; PKIB additionally interacts with the GPR39 receptor C-terminus in a zinc-regulated manner to modulate constitutive Gα13/RhoA/SRE signaling, and its expression is induced by HIF1 under chronic hyperglycemia and by GR/MYCN transcription factors in cancer contexts, linking hormonal and nutrient signals to PKA and Akt pathway output."},"narrative":{"mechanistic_narrative":"PKIB is an endogenous inhibitor of the cAMP-dependent protein kinase A catalytic subunit (PKA-C) that uses a pseudosubstrate site to engage PKA-C and, together with a leucine-rich nuclear export signal, governs the enzyme's subcellular distribution [PMID:10880337, PMID:19483721]. By directly binding PKA-C, PKIB suppresses PKA kinase activity and reduces phosphorylation of substrates such as HSP27 at Ser15/78/82 [PMID:40593489], and it controls nuclear translocation of PKA-C — its knockdown diminishes nuclear PKA-C [PMID:19483721] while its induction drives nuclear PKA-C accumulation and increased CREB phosphorylation [PMID:38030378]. Paradoxically, PKIB also enhances PKA-C-mediated phosphorylation of Akt at Ser473, a function demonstrated by in vitro reconstitution with recombinant proteins and by loss of Akt Ser473 phosphorylation on knockdown [PMID:19483721], placing PKIB upstream of PI3K/Akt signaling in driving proliferation, migration, and invasion in cancer and trophoblast cells [PMID:27325557, PMID:32676926]. Independently of its PKA-inhibitory pseudosubstrate domain, PKIB binds the cytosolic C-terminus of the zinc receptor GPR39 and enhances its constitutive Gα13/RhoA/SRE signaling, with zinc triggering PKIB dissociation from GPR39 to free it for PKA inhibition in a negative-feedback loop [PMID:24869658]. PKIB expression is a regulated node integrating hormonal and nutrient signals: it is induced by HIF1 under chronic hyperglycemia in pancreatic islets, where its disruption improves islet function in obese mice [PMID:25704817], and by GR and MYCN in prostate and bladder cancer contexts [PMID:38030378, PMID:40593489].","teleology":[{"year":2000,"claim":"Established the existence and identity of human PKIB, answering whether a distinct PKI-family inhibitor with both a pseudosubstrate site and a nuclear export signal exists in humans.","evidence":"cDNA cloning, sequence/domain analysis, and Northern blot of the human gene","pmids":["10880337"],"confidence":"Medium","gaps":["No direct demonstration of PKA inhibition or binding in this study","Functional consequences of the nuclear export signal not tested"]},{"year":2009,"claim":"Showed that PKIB physically binds PKA-C and controls its nuclear translocation, defining PKIB as a regulator of PKA-C localization rather than a purely cytosolic inhibitor.","evidence":"Co-immunoprecipitation, siRNA knockdown, and subcellular fractionation/imaging in prostate cancer cells","pmids":["19483721"],"confidence":"Medium","gaps":["Mechanism by which PKIB directs PKA-C trafficking not resolved","Single-lab Co-IP without reciprocal structural validation"]},{"year":2009,"claim":"Demonstrated the counterintuitive finding that PKIB enhances rather than only inhibits a PKA-C output, showing PKA-C-dependent Akt Ser473 phosphorylation is promoted by PKIB.","evidence":"In vitro kinase assay with recombinant PKIB and PKA-C plus siRNA knockdown and western blot","pmids":["19483721"],"confidence":"High","gaps":["How an inhibitor of PKA enhances a PKA-C-dependent phosphorylation event is mechanistically unexplained","Whether Akt is a direct PKA-C substrate or via an intermediate is unclear"]},{"year":2014,"claim":"Identified a PKA-independent function of PKIB, answering whether the protein acts only through PKA: it binds the GPR39 C-terminus and modulates constitutive Gα13/RhoA/SRE signaling.","evidence":"Yeast two-hybrid screen, co-expression functional assay, and SRE-reporter assay","pmids":["24869658"],"confidence":"Medium","gaps":["Structural basis of the GPR39 interaction not defined","Physiological tissue context of GPR39-PKIB coupling not established"]},{"year":2014,"claim":"Separated PKIB's two activities by mutagenesis, establishing that GPR39 binding and SRE induction are independent of the pseudosubstrate domain required for PKA inhibition.","evidence":"Site-directed mutagenesis of the pseudosubstrate domain with co-expression and SRE-reporter assays","pmids":["24869658"],"confidence":"Medium","gaps":["Which PKIB region mediates GPR39 binding not mapped","Whether the two functions are mutually exclusive in cells not tested"]},{"year":2014,"claim":"Defined a zinc-regulated switch coupling PKIB's two functions: zinc dissociates PKIB from GPR39, freeing it to inhibit PKA and forming a negative-feedback loop.","evidence":"Co-expression with zinc treatment and functional reporter assays","pmids":["24869658"],"confidence":"Medium","gaps":["Quantitative kinetics of zinc-driven dissociation not measured","Endogenous relevance of the feedback loop not shown in native tissue"]},{"year":2015,"claim":"Placed PKIB in a nutrient-responsive pathway in vivo, showing HIF1 induces PKIB under chronic hyperglycemia to suppress beta-cell PKA, with genetic disruption improving islet function.","evidence":"PKIB gene disruption in mice, glucose tolerance testing, and islet pathway analysis","pmids":["25704817"],"confidence":"Medium","gaps":["Direct HIF1 binding to the PKIB locus not shown in this entry","Contribution of the GPR39/Akt arms to the islet phenotype not dissected"]},{"year":2016,"claim":"Placed PKIB functionally upstream of PI3K/Akt in cancer, showing PI3K inhibition abolishes PKIB-driven proliferation and invasion in NSCLC.","evidence":"Gain/loss-of-function with MTT/BrdU, migration/invasion assays, and PI3K inhibitor rescue","pmids":["27325557"],"confidence":"Medium","gaps":["Direct molecular link from PKIB to PI3K activation not defined","Role of PKA inhibition versus Akt activation in the phenotype not separated"]},{"year":2020,"claim":"Extended the PKIB-Akt axis to a physiological invasive process, showing PKIB supports trophoblast migration, invasion, and vessel formation through Akt and downstream MMP2/MMP9/GSK3β.","evidence":"siRNA knockdown, real-time cell analysis, tube formation/sprouting assays, and western blot","pmids":["32676926"],"confidence":"Medium","gaps":["Whether PKA-C mediates the Akt effect in trophoblasts not tested","Upstream regulator of PKIB in trophoblasts unknown"]},{"year":2024,"claim":"Identified GR as an upstream transcriptional driver of PKIB and linked PKIB to nuclear PKA-C/CREB activation in castration-resistant prostate cancer.","evidence":"RNA-seq, western blot, nuclear fractionation, and CREB phosphorylation assays in CRPC models and xenografts","pmids":["38030378"],"confidence":"Medium","gaps":["Direct GR binding at the PKIB promoter not demonstrated here","Reconciliation of nuclear PKA-C accumulation with PKA inhibition not addressed"]},{"year":2025,"claim":"Identified a specific PKA substrate downstream of PKIB and a transcriptional driver, showing PKIB lowers HSP27 phosphorylation to promote bladder cancer and MYCN drives PKIB expression.","evidence":"In vitro proliferation/migration/invasion assays, xenograft, HSP27 phospho-western, and MYCN ChIP on the PKIB promoter","pmids":["40593489"],"confidence":"Medium","gaps":["Causal chain from reduced HSP27 phosphorylation to invasion not fully mapped","Whether MYCN regulation generalizes beyond bladder cancer not tested"]},{"year":null,"claim":"The central paradox of how a PKA pseudosubstrate inhibitor can simultaneously suppress PKA substrate phosphorylation (HSP27) and enhance a PKA-C-dependent output (Akt Ser473), while also redistributing PKA-C to the nucleus, remains mechanistically unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the PKIB-PKA-C complex coupled to localization control","No unifying biochemical explanation linking PKA inhibition, nuclear PKA-C accumulation, and Akt activation","Tissue-specific selection between the GPR39, PKA, and Akt functions not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,4,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,4,5,6]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,5]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,5,7,9]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,9,10]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3,5]}],"complexes":[],"partners":["PRKACA","GPR39","AKT1","HSP27"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9C010","full_name":"cAMP-dependent protein kinase inhibitor beta","aliases":[],"length_aa":78,"mass_kda":8.5,"function":"Extremely potent competitive inhibitor of cAMP-dependent protein kinase activity, this protein interacts with the catalytic subunit of the enzyme after the cAMP-induced dissociation of its regulatory chains","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9C010/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PKIB","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/PKIB","total_profiled":1310},"omim":[{"mim_id":"606914","title":"PROTEIN KINASE, cAMP-DEPENDENT CATALYTIC, INHIBITOR BETA; PKIB","url":"https://www.omim.org/entry/606914"},{"mim_id":"605078","title":"TAR DNA-BINDING PROTEIN; TARDBP","url":"https://www.omim.org/entry/605078"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":248.3},{"tissue":"intestine","ntpm":87.1}],"url":"https://www.proteinatlas.org/search/PKIB"},"hgnc":{"alias_symbol":[],"prev_symbol":["PRKACN2"]},"alphafold":{"accession":"Q9C010","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C010","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C010-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C010-F1-predicted_aligned_error_v6.png","plddt_mean":64.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PKIB","jax_strain_url":"https://www.jax.org/strain/search?query=PKIB"},"sequence":{"accession":"Q9C010","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C010.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C010/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C010"}},"corpus_meta":[{"pmid":"15448002","id":"PMC_15448002","title":"Met proto-oncogene and insulin-like growth factor binding protein 3 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70% identity to mouse PKIβ, containing both a pseudosubstrate site and a leucine-rich nuclear export signal motif, establishing it as a member of the cAMP-dependent protein kinase inhibitor (PKI) family.\",\n      \"method\": \"cDNA cloning, sequence analysis, Northern blot\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cloning with sequence/domain validation and tissue expression characterization, single lab\",\n      \"pmids\": [\"10880337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PKIB directly interacts with the cAMP-dependent protein kinase A catalytic subunit (PKA-C), and knockdown of PKIB in prostate cancer cells diminishes nuclear translocation of PKA-C, placing PKIB as a regulator of PKA-C subcellular localization.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, subcellular fractionation/imaging\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction demonstrated by Co-IP plus functional localization readout, single lab with multiple methods\",\n      \"pmids\": [\"19483721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PKIB enhances phosphorylation of Akt at Ser473 by PKA-C: in vitro kinase assay showed recombinant PKIB enhanced PKA-C-mediated phosphorylation of Akt at Ser473, and siRNA knockdown of PKIB decreased Akt Ser473 phosphorylation in prostate cancer cells.\",\n      \"method\": \"In vitro kinase assay with recombinant proteins, siRNA knockdown + western blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cellular knockdown validation, two orthogonal methods, single lab\",\n      \"pmids\": [\"19483721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PKIB interacts with the cytosolic C-terminus of the G-protein-coupled zinc receptor GPR39 (identified by yeast-2-hybrid screen and co-expression studies), and this interaction enhances GPR39's constitutive protective activity via the Gα13/RhoA/SRE pathway but not the zinc-dependent (ligand-mediated) pathway.\",\n      \"method\": \"Yeast two-hybrid screen, co-expression functional assay, SRE-reporter assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Y2H plus functional co-expression assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"24869658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Mutation of the pseudosubstrate domain of PKIB abolished its inhibitory activity on PKA but had no effect on its interaction with GPR39, cell protection, or SRE-dependent transcription induction, demonstrating that PKIB's interaction with GPR39 is independent of its PKA-inhibitory pseudosubstrate domain.\",\n      \"method\": \"Site-directed mutagenesis, co-expression functional assay, SRE-reporter assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with functional validation, single lab\",\n      \"pmids\": [\"24869658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Zinc causes dissociation of PKIB from GPR39, liberating PKIB to associate with PKA and inhibit its activity, establishing a negative-feedback loop that limits zinc-induced Gs pathway activation.\",\n      \"method\": \"Co-expression, zinc treatment, functional reporter assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assay demonstrating ligand-regulated dissociation and downstream PKA inhibition, single lab\",\n      \"pmids\": [\"24869658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Chronic hyperglycemia activates HIF1-dependent induction of PKIB in pancreatic islets; PKIB acts as a potent inhibitor of PKA catalytic activity in beta cells, and disruption of the PKIB gene improved islet function in obese mice, placing PKIB downstream of HIF1 in a feedback pathway that disrupts cAMP/PKA signaling.\",\n      \"method\": \"Genetic knockout (PKIB gene disruption in mice), glucose tolerance testing, molecular pathway analysis in islets\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic knockout with functional metabolic phenotype, pathway epistasis established, single lab\",\n      \"pmids\": [\"25704817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PKIB promotes cell proliferation and invasion/migration in NSCLC cells, and all these effects are abolished by inhibiting the PI3K/Akt pathway, placing PKIB functionally upstream of PI3K/Akt in NSCLC.\",\n      \"method\": \"Overexpression/knockdown, MTT/BrdU proliferation assays, migration/invasion assays, PI3K inhibitor rescue experiment, western blot\",\n      \"journal\": \"Experimental biology and medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with pathway inhibitor rescue, multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"27325557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Knockdown of PKIB in trophoblast cells decreases phosphorylated Akt and downstream proteins (MMP2, MMP9, GSK3β), and inhibits migration, invasion, and vessel formation, establishing that PKIB supports trophoblast invasiveness via the Akt signaling pathway.\",\n      \"method\": \"siRNA knockdown, real-time cell analysis, tube formation/spheroid sprouting assay, western blot\",\n      \"journal\": \"Reproductive sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with multiple functional assays and downstream pathway analysis, single lab\",\n      \"pmids\": [\"32676926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GR activation following androgen receptor signaling inhibition upregulates PKIB mRNA and protein in prostate cancer cells, leading to nuclear accumulation of PKA catalytic subunit (PKA-c) and increased CREB phosphorylation and activity.\",\n      \"method\": \"RNA-seq, western blot, nuclear fractionation, CREB phosphorylation assay in CRPC model systems and xenografts\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cellular and in vivo models, multiple readouts, single lab\",\n      \"pmids\": [\"38030378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PKIB disrupts PKA kinase activity, resulting in diminished phosphorylation of HSP27 at serine residues 15, 78, and 82; this mechanism promotes bladder cancer proliferation, migration, and invasion. The transcription factor MYCN binds the PKIB promoter and drives its expression in bladder cancer.\",\n      \"method\": \"In vitro functional assays (proliferation, migration, invasion), in vivo xenograft, western blot for HSP27 phosphorylation, ChIP for MYCN binding to PKIB promoter\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway demonstrated with substrate identification, ChIP for upstream regulator, in vivo validation, single lab\",\n      \"pmids\": [\"40593489\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PKIB is an endogenous inhibitor of the cAMP-dependent protein kinase A catalytic subunit (PKA-C) that directly binds PKA-C via a pseudosubstrate domain, blocks PKA activity (reducing substrate phosphorylation such as HSP27), controls PKA-C nuclear translocation, and paradoxically also promotes Akt Ser473 phosphorylation via a PKA-C-dependent mechanism; PKIB additionally interacts with the GPR39 receptor C-terminus in a zinc-regulated manner to modulate constitutive Gα13/RhoA/SRE signaling, and its expression is induced by HIF1 under chronic hyperglycemia and by GR/MYCN transcription factors in cancer contexts, linking hormonal and nutrient signals to PKA and Akt pathway output.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PKIB is an endogenous inhibitor of the cAMP-dependent protein kinase A catalytic subunit (PKA-C) that uses a pseudosubstrate site to engage PKA-C and, together with a leucine-rich nuclear export signal, governs the enzyme's subcellular distribution [#0, #1]. By directly binding PKA-C, PKIB suppresses PKA kinase activity and reduces phosphorylation of substrates such as HSP27 at Ser15/78/82 [#10], and it controls nuclear translocation of PKA-C — its knockdown diminishes nuclear PKA-C [#1] while its induction drives nuclear PKA-C accumulation and increased CREB phosphorylation [#9]. Paradoxically, PKIB also enhances PKA-C-mediated phosphorylation of Akt at Ser473, a function demonstrated by in vitro reconstitution with recombinant proteins and by loss of Akt Ser473 phosphorylation on knockdown [#2], placing PKIB upstream of PI3K/Akt signaling in driving proliferation, migration, and invasion in cancer and trophoblast cells [#7, #8]. Independently of its PKA-inhibitory pseudosubstrate domain, PKIB binds the cytosolic C-terminus of the zinc receptor GPR39 and enhances its constitutive Gα13/RhoA/SRE signaling, with zinc triggering PKIB dissociation from GPR39 to free it for PKA inhibition in a negative-feedback loop [#3, #4, #5]. PKIB expression is a regulated node integrating hormonal and nutrient signals: it is induced by HIF1 under chronic hyperglycemia in pancreatic islets, where its disruption improves islet function in obese mice [#6], and by GR and MYCN in prostate and bladder cancer contexts [#9, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the existence and identity of human PKIB, answering whether a distinct PKI-family inhibitor with both a pseudosubstrate site and a nuclear export signal exists in humans.\",\n      \"evidence\": \"cDNA cloning, sequence/domain analysis, and Northern blot of the human gene\",\n      \"pmids\": [\"10880337\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct demonstration of PKA inhibition or binding in this study\", \"Functional consequences of the nuclear export signal not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed that PKIB physically binds PKA-C and controls its nuclear translocation, defining PKIB as a regulator of PKA-C localization rather than a purely cytosolic inhibitor.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, and subcellular fractionation/imaging in prostate cancer cells\",\n      \"pmids\": [\"19483721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which PKIB directs PKA-C trafficking not resolved\", \"Single-lab Co-IP without reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated the counterintuitive finding that PKIB enhances rather than only inhibits a PKA-C output, showing PKA-C-dependent Akt Ser473 phosphorylation is promoted by PKIB.\",\n      \"evidence\": \"In vitro kinase assay with recombinant PKIB and PKA-C plus siRNA knockdown and western blot\",\n      \"pmids\": [\"19483721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an inhibitor of PKA enhances a PKA-C-dependent phosphorylation event is mechanistically unexplained\", \"Whether Akt is a direct PKA-C substrate or via an intermediate is unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified a PKA-independent function of PKIB, answering whether the protein acts only through PKA: it binds the GPR39 C-terminus and modulates constitutive Gα13/RhoA/SRE signaling.\",\n      \"evidence\": \"Yeast two-hybrid screen, co-expression functional assay, and SRE-reporter assay\",\n      \"pmids\": [\"24869658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of the GPR39 interaction not defined\", \"Physiological tissue context of GPR39-PKIB coupling not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Separated PKIB's two activities by mutagenesis, establishing that GPR39 binding and SRE induction are independent of the pseudosubstrate domain required for PKA inhibition.\",\n      \"evidence\": \"Site-directed mutagenesis of the pseudosubstrate domain with co-expression and SRE-reporter assays\",\n      \"pmids\": [\"24869658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which PKIB region mediates GPR39 binding not mapped\", \"Whether the two functions are mutually exclusive in cells not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a zinc-regulated switch coupling PKIB's two functions: zinc dissociates PKIB from GPR39, freeing it to inhibit PKA and forming a negative-feedback loop.\",\n      \"evidence\": \"Co-expression with zinc treatment and functional reporter assays\",\n      \"pmids\": [\"24869658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative kinetics of zinc-driven dissociation not measured\", \"Endogenous relevance of the feedback loop not shown in native tissue\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed PKIB in a nutrient-responsive pathway in vivo, showing HIF1 induces PKIB under chronic hyperglycemia to suppress beta-cell PKA, with genetic disruption improving islet function.\",\n      \"evidence\": \"PKIB gene disruption in mice, glucose tolerance testing, and islet pathway analysis\",\n      \"pmids\": [\"25704817\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HIF1 binding to the PKIB locus not shown in this entry\", \"Contribution of the GPR39/Akt arms to the islet phenotype not dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed PKIB functionally upstream of PI3K/Akt in cancer, showing PI3K inhibition abolishes PKIB-driven proliferation and invasion in NSCLC.\",\n      \"evidence\": \"Gain/loss-of-function with MTT/BrdU, migration/invasion assays, and PI3K inhibitor rescue\",\n      \"pmids\": [\"27325557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link from PKIB to PI3K activation not defined\", \"Role of PKA inhibition versus Akt activation in the phenotype not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended the PKIB-Akt axis to a physiological invasive process, showing PKIB supports trophoblast migration, invasion, and vessel formation through Akt and downstream MMP2/MMP9/GSK3β.\",\n      \"evidence\": \"siRNA knockdown, real-time cell analysis, tube formation/sprouting assays, and western blot\",\n      \"pmids\": [\"32676926\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PKA-C mediates the Akt effect in trophoblasts not tested\", \"Upstream regulator of PKIB in trophoblasts unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified GR as an upstream transcriptional driver of PKIB and linked PKIB to nuclear PKA-C/CREB activation in castration-resistant prostate cancer.\",\n      \"evidence\": \"RNA-seq, western blot, nuclear fractionation, and CREB phosphorylation assays in CRPC models and xenografts\",\n      \"pmids\": [\"38030378\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GR binding at the PKIB promoter not demonstrated here\", \"Reconciliation of nuclear PKA-C accumulation with PKA inhibition not addressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a specific PKA substrate downstream of PKIB and a transcriptional driver, showing PKIB lowers HSP27 phosphorylation to promote bladder cancer and MYCN drives PKIB expression.\",\n      \"evidence\": \"In vitro proliferation/migration/invasion assays, xenograft, HSP27 phospho-western, and MYCN ChIP on the PKIB promoter\",\n      \"pmids\": [\"40593489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from reduced HSP27 phosphorylation to invasion not fully mapped\", \"Whether MYCN regulation generalizes beyond bladder cancer not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The central paradox of how a PKA pseudosubstrate inhibitor can simultaneously suppress PKA substrate phosphorylation (HSP27) and enhance a PKA-C-dependent output (Akt Ser473), while also redistributing PKA-C to the nucleus, remains mechanistically unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the PKIB-PKA-C complex coupled to localization control\", \"No unifying biochemical explanation linking PKA inhibition, nuclear PKA-C accumulation, and Akt activation\", \"Tissue-specific selection between the GPR39, PKA, and Akt functions not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 4, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 5, 7, 9]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 9, 10]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PRKACA\", \"GPR39\", \"AKT1\", \"HSP27\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}