{"gene":"PRKAB2","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2020,"finding":"PRKAB2 (AMPKβ2) knockout in human induced pluripotent stem cells (hiPSCs) abrogates mesoderm specification and differentiation into cardiomyocytes, as shown by loss of cardiac lineage markers (cTnT, GATA4, NKX2.5), establishing that AMPKβ2 is indispensable for cardiac lineage commitment at the mesoderm specification stage.","method":"CRISPR/Cas9 knockout in hiPSCs, gene expression analysis (RNA-Seq), histochemical staining for cardiac markers","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular phenotype and multiple orthogonal readouts (RNA-Seq, histochemistry), single lab","pmids":["33454005"],"is_preprint":false},{"year":2017,"finding":"MβCD (methyl-β-cyclodextrin) directly activates AMPK by binding to its β-subunits (PRKAB1/PRKAB2); knockdown of PRKAB2 (or PRKAB1) abolished MβCD-mediated reduction of cholesterol storage in NPC1-deficient cells, demonstrating that PRKAB2 is the molecular target through which MβCD enhances autophagy flux.","method":"siRNA knockdown of PRKAB1/PRKAB2, AMPK activity assays, cholesterol storage measurements in NPC1 cells, pharmacological inhibition","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding to β-subunit established by knockdown rescue, multiple orthogonal methods, single lab","pmids":["28613987"],"is_preprint":false},{"year":2026,"finding":"PRKAB2 overexpression in renal cell carcinoma (RCC) inhibits mitophagy via two mechanisms: (1) enhancing binding between LRPPRC and PRKN/parkin, competitively reducing PRKN's interaction with PINK1 and suppressing ubiquitin-dependent mitophagy; (2) promoting AMPK phosphorylation which suppresses SREBF1/SREBP1-mediated transcriptional activation of CRLS1, reducing cardiolipin synthesis required for mitophagy. PRKAB2 overexpression also restored sensitivity to sunitinib in resistant RCC cells.","method":"In vivo genome-wide CRISPR screening, Co-immunoprecipitation, overexpression/knockdown in vitro and in vivo, chromatin immunoprecipitation, Western blot, tumor growth assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide CRISPR screen, reciprocal Co-IP for protein interactions, in vitro and in vivo functional assays, multiple orthogonal mechanistic readouts in single study","pmids":["41612594"],"is_preprint":false},{"year":2024,"finding":"miR-29b directly targets PRKAB2 and negatively regulates its expression (confirmed by luciferase reporter assay and Western blot); knockdown of PRKAB2 reversed the increased apoptosis and inflammation induced by miR-29b inhibitors in high-glucose-treated podocytes, placing PRKAB2 downstream of miR-29b in a pathway regulating podocyte injury in diabetic nephropathy.","method":"Luciferase reporter assay, Western blot, siRNA knockdown, flow cytometry (apoptosis), ELISA (inflammatory cytokines)","journal":"Endocrine, metabolic & immune disorders drug targets","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct miRNA-target validation by luciferase reporter plus functional rescue experiment, single lab, two orthogonal methods","pmids":["38204237"],"is_preprint":false},{"year":2011,"finding":"In lymphoblast cell lines from 1q21.1 deletion carriers, PRKAB2 protein levels were reduced in concordance with copy number, and AMP kinase function was specifically attenuated in deletion-containing cells, establishing a direct relationship between PRKAB2 dosage and AMPK activity.","method":"Western blot for protein levels, AMPK activity assay, lymphoblast cell lines from deletion/duplication carriers","journal":"Orphanet journal of rare diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein quantification and functional AMPK activity measurement in patient-derived cells with defined copy number changes, single lab","pmids":["21824431"],"is_preprint":false},{"year":2016,"finding":"PRKAB2, encoding the AMPKβ2 subunit, is part of the heterotrimeric AMPK complex (α, β, γ subunits); the β2 isoform is one of 12 possible heterotrimeric combinations and may confer distinct subcellular localization and function compared to β1, with PRKAB2/α1 gene combinations frequently amplified in tumour cells suggesting a potentially oncogenic role in some contexts.","method":"Review/synthesis of genetic and functional data across isoforms (not primary experiment); gene amplification data from tumour databases","journal":"The FEBS journal","confidence":"Low","confidence_rationale":"Tier 4 / Weak — review paper synthesizing existing data without primary experiments on PRKAB2 specifically","pmids":["26934201"],"is_preprint":false},{"year":2025,"finding":"PRKAB2 knockout in induced pluripotent stem cells influenced expression of CHD1L and genes regulating cytokine activity, growth factor signaling, and pluripotency pathways, suggesting PRKAB2 loss-of-function has downstream transcriptional consequences relevant to immune signaling.","method":"PRKAB2-/- iPSC functional analysis, gene expression profiling","journal":"Frontiers in genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single study using iPSC knockout, primarily expression analysis without direct mechanistic follow-up on specific pathways","pmids":["40115816"],"is_preprint":false}],"current_model":"PRKAB2 encodes the β2 regulatory subunit of the heterotrimeric AMP-activated protein kinase (AMPK) complex; it serves as a scaffold/regulatory component that is required for AMPK complex integrity and activity, is indispensable for mesoderm specification and cardiomyocyte differentiation in human iPSCs, acts as a tumor suppressor in renal cell carcinoma by inhibiting mitophagy through two mechanisms (disrupting LRPPRC–PRKN/parkin–PINK1 interactions and suppressing CRLS1-mediated cardiolipin synthesis via AMPK phosphorylation of SREBF1), is a direct target of miR-29b in podocytes where its downregulation promotes apoptosis and inflammation, and serves as the binding target through which methyl-β-cyclodextrin activates AMPK to restore autophagy flux."},"narrative":{"mechanistic_narrative":"PRKAB2 encodes the β2 regulatory subunit of the heterotrimeric AMP-activated protein kinase (AMPK) complex, and its dosage directly governs cellular AMPK activity: reduced PRKAB2 protein, as seen in 1q21.1 deletion carrier cells, specifically attenuates AMPK function [PMID:21824431]. Through this regulatory role, PRKAB2 is indispensable for mesoderm specification and cardiomyocyte differentiation in human iPSCs, with knockout abolishing cardiac lineage commitment [PMID:33454005]. In renal cell carcinoma, PRKAB2 acts as a tumor suppressor that inhibits mitophagy by two convergent routes — enhancing LRPPRC–PRKN binding to competitively displace PRKN from PINK1, and driving AMPK-mediated suppression of SREBF1-dependent transcription of CRLS1 to limit cardiolipin synthesis — and its overexpression restores sunitinib sensitivity in resistant cells [PMID:41612594]. PRKAB2 is also the β-subunit target through which methyl-β-cyclodextrin activates AMPK to restore autophagy flux in NPC1-deficient cells [PMID:28613987], and it is a direct target of miR-29b whose downregulation promotes apoptosis and inflammation in high-glucose-treated podocytes [PMID:38204237].","teleology":[{"year":2011,"claim":"Established that PRKAB2 gene dosage directly sets AMPK activity, linking copy-number variation to a quantitative biochemical readout.","evidence":"Western blot and AMPK activity assays in lymphoblast lines from 1q21.1 deletion/duplication carriers","pmids":["21824431"],"confidence":"Medium","gaps":["Does not resolve which downstream AMPK substrates are affected","Single patient-derived cell system, no rescue by re-expression"]},{"year":2016,"claim":"Placed PRKAB2 as the β2 isoform within the heterotrimeric AMPK complex and raised the possibility of isoform-specific localization and context-dependent oncogenic roles.","evidence":"Review/synthesis of isoform genetics and tumour amplification data (no primary experiment)","pmids":["26934201"],"confidence":"Low","gaps":["No primary experiment on PRKAB2 in this work","Isoform-specific localization not directly demonstrated","Oncogenic versus tumour-suppressor role unresolved"]},{"year":2017,"claim":"Identified the AMPK β-subunit, including PRKAB2, as the direct molecular target through which methyl-β-cyclodextrin activates AMPK to enhance autophagy flux.","evidence":"siRNA knockdown of PRKAB1/PRKAB2 with AMPK activity assays and cholesterol storage measurements in NPC1-deficient cells","pmids":["28613987"],"confidence":"Medium","gaps":["Direct binding site on the β-subunit not structurally mapped","Redundancy between PRKAB1 and PRKAB2 not fully separated"]},{"year":2020,"claim":"Demonstrated that PRKAB2 is required at the mesoderm specification stage for cardiac lineage commitment, defining a developmental function beyond metabolic sensing.","evidence":"CRISPR/Cas9 knockout in hiPSCs with RNA-Seq and histochemical staining for cardiac markers","pmids":["33454005"],"confidence":"Medium","gaps":["Mechanism linking AMPK β2 loss to mesoderm gene programs not defined","Single lab, single cellular model"]},{"year":2024,"claim":"Positioned PRKAB2 downstream of miR-29b in podocyte injury, showing its repression mediates apoptosis and inflammation in a diabetic nephropathy context.","evidence":"Luciferase reporter, Western blot, siRNA knockdown with apoptosis (flow cytometry) and cytokine (ELISA) readouts in high-glucose podocytes","pmids":["38204237"],"confidence":"Medium","gaps":["AMPK-dependence of the protective effect not directly tested","In vitro only, single lab"]},{"year":2026,"claim":"Defined PRKAB2 as a tumor suppressor in RCC that inhibits mitophagy through dual mechanisms and modulates drug sensitivity, providing the most detailed mechanistic model to date.","evidence":"In vivo genome-wide CRISPR screen, reciprocal Co-IP, ChIP, overexpression/knockdown, and tumor growth assays in vitro and in vivo","pmids":["41612594"],"confidence":"High","gaps":["Whether these mitophagy mechanisms generalize beyond RCC is untested","Structural basis of LRPPRC–PRKN modulation not resolved"]},{"year":null,"claim":"How PRKAB2-specific (versus PRKAB1) AMPK complexes are targeted to distinct substrates and localizations across these diverse tissue contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of PRKAB2 within the AMPK heterotrimer in the corpus","Isoform-selective substrate specificity not directly defined","Reconciliation of tumor-suppressor versus oncogenic roles across tissues unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,1]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1]}],"localization":[],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4]}],"complexes":["AMPK heterotrimeric complex"],"partners":["PRKAB1","LRPPRC","PRKN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43741","full_name":"5'-AMP-activated protein kinase subunit beta-2","aliases":[],"length_aa":272,"mass_kda":30.3,"function":"Non-catalytic subunit of AMP-activated protein kinase (AMPK), an energy sensor protein kinase that plays a key role in regulating cellular energy metabolism. In response to reduction of intracellular ATP levels, AMPK activates energy-producing pathways and inhibits energy-consuming processes: inhibits protein, carbohydrate and lipid biosynthesis, as well as cell growth and proliferation. AMPK acts via direct phosphorylation of metabolic enzymes, and by longer-term effects via phosphorylation of transcription regulators. Also acts as a regulator of cellular polarity by remodeling the actin cytoskeleton; probably by indirectly activating myosin. Beta non-catalytic subunit acts as a scaffold on which the AMPK complex assembles, via its C-terminus that bridges alpha (PRKAA1 or PRKAA2) and gamma subunits (PRKAG1, PRKAG2 or PRKAG3)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O43741/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRKAB2","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PRKAA1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/PRKAB2","total_profiled":1310},"omim":[{"mim_id":"616427","title":"A-KINASE ANCHOR INHIBITOR 1; AKAIN1","url":"https://www.omim.org/entry/616427"},{"mim_id":"602741","title":"PROTEIN KINASE, AMP-ACTIVATED, NONCATALYTIC, BETA-2; PRKAB2","url":"https://www.omim.org/entry/602741"},{"mim_id":"602740","title":"PROTEIN KINASE, AMP-ACTIVATED, NONCATALYTIC, BETA-1; PRKAB1","url":"https://www.omim.org/entry/602740"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":91.1},{"tissue":"tongue","ntpm":97.0}],"url":"https://www.proteinatlas.org/search/PRKAB2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O43741","domains":[{"cath_id":"2.60.40.10","chopping":"77-156","consensus_level":"high","plddt":95.6529,"start":77,"end":156},{"cath_id":"2.20.25.290","chopping":"211-272","consensus_level":"high","plddt":96.2124,"start":211,"end":272}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43741","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43741-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43741-F1-predicted_aligned_error_v6.png","plddt_mean":77.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRKAB2","jax_strain_url":"https://www.jax.org/strain/search?query=PRKAB2"},"sequence":{"accession":"O43741","fasta_url":"https://rest.uniprot.org/uniprotkb/O43741.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43741/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43741"}},"corpus_meta":[{"pmid":"26934201","id":"PMC_26934201","title":"AMP-activated 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38731907","citation_count":1,"is_preprint":false},{"pmid":"34589546","id":"PMC_34589546","title":"Association Analysis of LEP Signaling Pathway with Type 2 Diabetes Mellitus in Chinese Han Population from South China.","date":"2021","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/34589546","citation_count":1,"is_preprint":false},{"pmid":"41612594","id":"PMC_41612594","title":"PRKAB2 as a tumor suppressor in renal cell carcinoma: inhibiting mitophagy via the LRPPRC-PRKN/parkin interaction and cardiolipin biosynthesis.","date":"2026","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/41612594","citation_count":0,"is_preprint":false},{"pmid":"42001553","id":"PMC_42001553","title":"Human genetics of HIV infection.","date":"2026","source":"Current opinion in 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pigs.","date":"2025","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/41023780","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":32365,"output_tokens":1959,"usd":0.06324,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8994,"output_tokens":2314,"usd":0.05141,"stage2_stop_reason":"end_turn"},"total_usd":0.11465,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"PRKAB2 (AMPKβ2) knockout in human induced pluripotent stem cells (hiPSCs) abrogates mesoderm specification and differentiation into cardiomyocytes, as shown by loss of cardiac lineage markers (cTnT, GATA4, NKX2.5), establishing that AMPKβ2 is indispensable for cardiac lineage commitment at the mesoderm specification stage.\",\n      \"method\": \"CRISPR/Cas9 knockout in hiPSCs, gene expression analysis (RNA-Seq), histochemical staining for cardiac markers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular phenotype and multiple orthogonal readouts (RNA-Seq, histochemistry), single lab\",\n      \"pmids\": [\"33454005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MβCD (methyl-β-cyclodextrin) directly activates AMPK by binding to its β-subunits (PRKAB1/PRKAB2); knockdown of PRKAB2 (or PRKAB1) abolished MβCD-mediated reduction of cholesterol storage in NPC1-deficient cells, demonstrating that PRKAB2 is the molecular target through which MβCD enhances autophagy flux.\",\n      \"method\": \"siRNA knockdown of PRKAB1/PRKAB2, AMPK activity assays, cholesterol storage measurements in NPC1 cells, pharmacological inhibition\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding to β-subunit established by knockdown rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28613987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PRKAB2 overexpression in renal cell carcinoma (RCC) inhibits mitophagy via two mechanisms: (1) enhancing binding between LRPPRC and PRKN/parkin, competitively reducing PRKN's interaction with PINK1 and suppressing ubiquitin-dependent mitophagy; (2) promoting AMPK phosphorylation which suppresses SREBF1/SREBP1-mediated transcriptional activation of CRLS1, reducing cardiolipin synthesis required for mitophagy. PRKAB2 overexpression also restored sensitivity to sunitinib in resistant RCC cells.\",\n      \"method\": \"In vivo genome-wide CRISPR screening, Co-immunoprecipitation, overexpression/knockdown in vitro and in vivo, chromatin immunoprecipitation, Western blot, tumor growth assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide CRISPR screen, reciprocal Co-IP for protein interactions, in vitro and in vivo functional assays, multiple orthogonal mechanistic readouts in single study\",\n      \"pmids\": [\"41612594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-29b directly targets PRKAB2 and negatively regulates its expression (confirmed by luciferase reporter assay and Western blot); knockdown of PRKAB2 reversed the increased apoptosis and inflammation induced by miR-29b inhibitors in high-glucose-treated podocytes, placing PRKAB2 downstream of miR-29b in a pathway regulating podocyte injury in diabetic nephropathy.\",\n      \"method\": \"Luciferase reporter assay, Western blot, siRNA knockdown, flow cytometry (apoptosis), ELISA (inflammatory cytokines)\",\n      \"journal\": \"Endocrine, metabolic & immune disorders drug targets\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct miRNA-target validation by luciferase reporter plus functional rescue experiment, single lab, two orthogonal methods\",\n      \"pmids\": [\"38204237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In lymphoblast cell lines from 1q21.1 deletion carriers, PRKAB2 protein levels were reduced in concordance with copy number, and AMP kinase function was specifically attenuated in deletion-containing cells, establishing a direct relationship between PRKAB2 dosage and AMPK activity.\",\n      \"method\": \"Western blot for protein levels, AMPK activity assay, lymphoblast cell lines from deletion/duplication carriers\",\n      \"journal\": \"Orphanet journal of rare diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein quantification and functional AMPK activity measurement in patient-derived cells with defined copy number changes, single lab\",\n      \"pmids\": [\"21824431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRKAB2, encoding the AMPKβ2 subunit, is part of the heterotrimeric AMPK complex (α, β, γ subunits); the β2 isoform is one of 12 possible heterotrimeric combinations and may confer distinct subcellular localization and function compared to β1, with PRKAB2/α1 gene combinations frequently amplified in tumour cells suggesting a potentially oncogenic role in some contexts.\",\n      \"method\": \"Review/synthesis of genetic and functional data across isoforms (not primary experiment); gene amplification data from tumour databases\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — review paper synthesizing existing data without primary experiments on PRKAB2 specifically\",\n      \"pmids\": [\"26934201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRKAB2 knockout in induced pluripotent stem cells influenced expression of CHD1L and genes regulating cytokine activity, growth factor signaling, and pluripotency pathways, suggesting PRKAB2 loss-of-function has downstream transcriptional consequences relevant to immune signaling.\",\n      \"method\": \"PRKAB2-/- iPSC functional analysis, gene expression profiling\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single study using iPSC knockout, primarily expression analysis without direct mechanistic follow-up on specific pathways\",\n      \"pmids\": [\"40115816\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRKAB2 encodes the β2 regulatory subunit of the heterotrimeric AMP-activated protein kinase (AMPK) complex; it serves as a scaffold/regulatory component that is required for AMPK complex integrity and activity, is indispensable for mesoderm specification and cardiomyocyte differentiation in human iPSCs, acts as a tumor suppressor in renal cell carcinoma by inhibiting mitophagy through two mechanisms (disrupting LRPPRC–PRKN/parkin–PINK1 interactions and suppressing CRLS1-mediated cardiolipin synthesis via AMPK phosphorylation of SREBF1), is a direct target of miR-29b in podocytes where its downregulation promotes apoptosis and inflammation, and serves as the binding target through which methyl-β-cyclodextrin activates AMPK to restore autophagy flux.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRKAB2 encodes the β2 regulatory subunit of the heterotrimeric AMP-activated protein kinase (AMPK) complex, and its dosage directly governs cellular AMPK activity: reduced PRKAB2 protein, as seen in 1q21.1 deletion carrier cells, specifically attenuates AMPK function [#4]. Through this regulatory role, PRKAB2 is indispensable for mesoderm specification and cardiomyocyte differentiation in human iPSCs, with knockout abolishing cardiac lineage commitment [#0]. In renal cell carcinoma, PRKAB2 acts as a tumor suppressor that inhibits mitophagy by two convergent routes — enhancing LRPPRC–PRKN binding to competitively displace PRKN from PINK1, and driving AMPK-mediated suppression of SREBF1-dependent transcription of CRLS1 to limit cardiolipin synthesis — and its overexpression restores sunitinib sensitivity in resistant cells [#2]. PRKAB2 is also the β-subunit target through which methyl-β-cyclodextrin activates AMPK to restore autophagy flux in NPC1-deficient cells [#1], and it is a direct target of miR-29b whose downregulation promotes apoptosis and inflammation in high-glucose-treated podocytes [#3].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that PRKAB2 gene dosage directly sets AMPK activity, linking copy-number variation to a quantitative biochemical readout.\",\n      \"evidence\": \"Western blot and AMPK activity assays in lymphoblast lines from 1q21.1 deletion/duplication carriers\",\n      \"pmids\": [\"21824431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not resolve which downstream AMPK substrates are affected\", \"Single patient-derived cell system, no rescue by re-expression\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed PRKAB2 as the β2 isoform within the heterotrimeric AMPK complex and raised the possibility of isoform-specific localization and context-dependent oncogenic roles.\",\n      \"evidence\": \"Review/synthesis of isoform genetics and tumour amplification data (no primary experiment)\",\n      \"pmids\": [\"26934201\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No primary experiment on PRKAB2 in this work\", \"Isoform-specific localization not directly demonstrated\", \"Oncogenic versus tumour-suppressor role unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the AMPK β-subunit, including PRKAB2, as the direct molecular target through which methyl-β-cyclodextrin activates AMPK to enhance autophagy flux.\",\n      \"evidence\": \"siRNA knockdown of PRKAB1/PRKAB2 with AMPK activity assays and cholesterol storage measurements in NPC1-deficient cells\",\n      \"pmids\": [\"28613987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding site on the β-subunit not structurally mapped\", \"Redundancy between PRKAB1 and PRKAB2 not fully separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that PRKAB2 is required at the mesoderm specification stage for cardiac lineage commitment, defining a developmental function beyond metabolic sensing.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in hiPSCs with RNA-Seq and histochemical staining for cardiac markers\",\n      \"pmids\": [\"33454005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking AMPK β2 loss to mesoderm gene programs not defined\", \"Single lab, single cellular model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Positioned PRKAB2 downstream of miR-29b in podocyte injury, showing its repression mediates apoptosis and inflammation in a diabetic nephropathy context.\",\n      \"evidence\": \"Luciferase reporter, Western blot, siRNA knockdown with apoptosis (flow cytometry) and cytokine (ELISA) readouts in high-glucose podocytes\",\n      \"pmids\": [\"38204237\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AMPK-dependence of the protective effect not directly tested\", \"In vitro only, single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined PRKAB2 as a tumor suppressor in RCC that inhibits mitophagy through dual mechanisms and modulates drug sensitivity, providing the most detailed mechanistic model to date.\",\n      \"evidence\": \"In vivo genome-wide CRISPR screen, reciprocal Co-IP, ChIP, overexpression/knockdown, and tumor growth assays in vitro and in vivo\",\n      \"pmids\": [\"41612594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these mitophagy mechanisms generalize beyond RCC is untested\", \"Structural basis of LRPPRC–PRKN modulation not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PRKAB2-specific (versus PRKAB1) AMPK complexes are targeted to distinct substrates and localizations across these diverse tissue contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of PRKAB2 within the AMPK heterotrimer in the corpus\", \"Isoform-selective substrate specificity not directly defined\", \"Reconciliation of tumor-suppressor versus oncogenic roles across tissues unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 1]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\"AMPK heterotrimeric complex\"],\n    \"partners\": [\"PRKAB1\", \"LRPPRC\", \"PRKN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}