{"gene":"PHB1","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":2002,"finding":"PHB1 (Phb1p) and PHB2 (Phb2p) form a large multimeric ring complex (~12–14 copies each) in the mitochondrial inner membrane that functions as a novel membrane-bound chaperone, binding directly to newly synthesized mitochondrial translation products and stabilizing them against degradation by membrane-bound AAA metalloproteases.","method":"Biochemical fractionation, native molecular weight analysis, chaperone binding assays, yeast genetic studies","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 — replicated across multiple labs with biochemical and genetic evidence; review consolidating foundational mechanistic findings","pmids":["11852914"],"is_preprint":false},{"year":2007,"finding":"PHB1 and PHB2 localize to the mitochondrial inner membrane of human T cells (not the nucleus as previously reported), are serine-phosphorylated (PHB1) and serine/tyrosine-phosphorylated (PHB2, mapped to Tyr248 by MS and mutagenesis), and siRNA-mediated knockdown disrupts mitochondrial membrane potential, establishing that the PHB1/PHB2 phosphocomplex is required for mitochondrial integrity in T cells.","method":"Subcellular fractionation, immunofluorescence, electron microscopy, orthophosphate labeling, phosphoamino acid analysis, mass spectrometry, site-directed mutagenesis, phospho-specific antibodies, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single study with mutagenesis validation of phosphorylation site and functional knockdown readout","pmids":["18086671"],"is_preprint":false},{"year":2013,"finding":"PHB (prohibitin 1) inhibits apoptosis in undifferentiated rat granulosa cells through a PHB → MEK-ERK1/2 → Bcl-2/Bcl-xL pathway: PHB overexpression increases anti-apoptotic Bcl-2 and Bcl-xL, reduces cytochrome c release, and inhibits caspase-3 activity, while PHB silencing causes mitochondrial fragmentation and sensitizes cells to apoptosis.","method":"Microarray, immunoblot, ectopic overexpression, siRNA knockdown, flow cytometry, mitochondrial morphology imaging","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2/3 — multiple methods but single lab; pathway placement via overexpression and knockdown with defined molecular readouts","pmids":["24096434"],"is_preprint":false},{"year":2017,"finding":"PHB complex deficiency impairs the formation of mitochondrial respiratory supercomplexes (RSCs) without altering the abundance of individual respiratory complex subunits, leading to elevated basal ROS production and increased mitochondrial flash (mitoflash) frequency up to 5.4-fold; the multimeric PHB1/PHB2 complex is the functional unit required for RSC assembly.","method":"PHB1/PHB2 siRNA knockdown, mitoflash imaging with fluorescent reporters, ROS measurement, blue native PAGE for RSC assessment, rescue by co-expression of PHB1 and PHB2","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal assays, rescue experiment establishes complex as functional unit, mechanistic link between PHB, RSC assembly, ROS, and mitoflash clearly delineated","pmids":["28630166"],"is_preprint":false},{"year":2017,"finding":"Japanese encephalitis virus (JEV) infection induces ER stress in human neural stem cells, and prohibitin (PHB/PHB1) interacts with JEV viral RNA, implicating PHB1 as a participant in ER stress-induced apoptosis during viral infection.","method":"2D gel electrophoresis-based proteomics, mass spectrometry, in vivo validation in mice subventricular zone and human autopsy samples","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 — proteomic identification without detailed mechanistic follow-up of PHB1-specific function","pmids":["28102850"],"is_preprint":false},{"year":2019,"finding":"LPLUNC1 stabilizes PHB1 protein by competitively blocking TRIM21-mediated ubiquitination of PHB1; LPLUNC1 binds PHB1 with higher affinity than TRIM21, preventing TRIM21 from ubiquitinating PHB1 and thus its proteasomal degradation. Stabilized PHB1 suppresses NF-κB activity in nasopharyngeal carcinoma cells, and PHB1 depletion reverses the anti-tumor effects of LPLUNC1.","method":"Co-immunoprecipitation, ubiquitination assays, competitive binding assays, siRNA knockdown, NF-κB reporter assays, rescue experiments","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ubiquitination assay, competitive binding, and functional rescue across multiple experiments identify TRIM21 as E3 ligase for PHB1 and LPLUNC1 as its inhibitor","pmids":["30886235"],"is_preprint":false},{"year":2019,"finding":"FoxM1 transcription factor binds the PHB1 promoter and enhances PHB1 expression at transcriptional and post-transcriptional levels; PHB1 then interacts with C-RAF and promotes ERK1/2 phosphorylation, driving paclitaxel resistance in pancreatic cancer cells. PHB1 knockdown sensitizes resistant cells to paclitaxel, and ABCA2-mediated drug efflux also operates downstream of the FoxM1/PHB1/RAF-MEK-ERK axis.","method":"ChIP (chromatin immunoprecipitation), Co-immunoprecipitation, PHB1 knockdown/overexpression, in vitro and in vivo drug resistance assays, ERK1/2 phosphorylation immunoblot","journal":"Molecular therapy oncolytics","confidence":"Medium","confidence_rationale":"Tier 2/3 — ChIP confirms direct promoter binding, Co-IP confirms PHB1–C-RAF interaction, functional rescue confirms pathway; single lab","pmids":["31334335"],"is_preprint":false},{"year":2020,"finding":"HDAC6 downregulates PHB1 expression and function in sepsis; inhibition of HDAC6 restores PHB1-mediated mitochondrial respiratory chain function, reduces oxidant production, and protects against oxidative injury in a rat CLP sepsis model.","method":"qRT-PCR, western blotting, CLP sepsis model, HDAC6 inhibition, mitochondrial respiratory control rate measurement, histological analysis","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2/3 — in vivo model with functional mitochondrial readout; single lab, mechanistic link between HDAC6 and PHB1 established through pharmacological inhibition","pmids":["32221047"],"is_preprint":false},{"year":2022,"finding":"CHCHD10 (an ALS/FTD gene product) interacts with SLP2 (Stomatin-Like Protein 2) and together stabilize the PHB complex in the mitochondrial inner membrane; the CHCHD10 p.Ser59Leu mutation causes SLP2-prohibitin aggregates, destabilizes the PHB complex, activates the OMA1 cascade with OPA1 processing, leads to mitochondrial fragmentation and abnormal cristae morphogenesis, and results in motor neuron death in spinal cord.","method":"Patient fibroblasts, Chchd10S59L/+ mouse model, co-immunoprecipitation, immunofluorescence, electron microscopy, in vivo hippocampus and spinal cord histology, OMA1/OPA1 processing assays","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, patient-derived cells and mouse model with defined molecular cascade from PHB complex destabilization to neuronal death","pmids":["35656794"],"is_preprint":false},{"year":2023,"finding":"PHB1 knockdown increases cytoplasmic mtDNA levels and enhances NLRP3 inflammasome activation; mitophagy inhibitor treatment abolishes PHB1 knockdown-mediated NLRP3 activation, establishing that PHB1 suppresses NLRP3 inflammasome activation through promotion of mitophagy in the context of sepsis.","method":"PHB1 siRNA knockdown, cytoplasmic mtDNA quantification, NLRP3 inflammasome activation assays (IL-1β, caspase-1 cleavage), mitophagy inhibitor treatment, bioinformatic clustering of sepsis samples","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2/3 — mechanistic link via mitophagy inhibitor rescue experiment; single lab with functional knockdown and defined pathway","pmids":["37359543"],"is_preprint":false},{"year":2023,"finding":"PHB1 physically interacts with Sam50 (mitochondrial outer membrane import channel) to stabilize mtDNA; lycopene reinforces this Sam50/PHB1 interaction to prevent mtDNA release into the cytoplasm via mPTP and BAX pores, thereby inhibiting cGAS-STING pathway activation and renal PANoptosis.","method":"Co-immunoprecipitation, mtDNA stability assays, mPTP/BAX pore measurements, cGAS-STING pathway readouts, mouse model (350 mice), lycopene treatment","journal":"Journal of agricultural and food chemistry","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP establishes Sam50/PHB1 interaction; in vivo model with defined molecular pathway; single lab","pmids":["38820047"],"is_preprint":false},{"year":2023,"finding":"PHB1 and PHB2 (prohibitins) are directly associated with the eIF4F translation initiation complex in chronic lymphocytic leukemia (CLL) cells; pharmacological targeting of PHBs with the flavagline FL3 or PHB knockdown inhibits translation of MYC oncogene mRNA and other oncogenic mRNAs, arrests proliferation, and rewires MYC-driven metabolism, with the RAS-RAF-MAPK pathway not involved in translation regulation in this context.","method":"Multiomics (transcriptomics, proteomics, translatomics), Co-immunoprecipitation of PHB with eIF4F components, FL3 treatment, PHB1/PHB2 siRNA knockdown, in vivo CLL mouse model, patient CLL sample analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP establishing PHB-eIF4F interaction, phenotype replicated by knockdown and pharmacological inhibition, in vivo validation, multiple orthogonal omics approaches","pmids":["37084385"],"is_preprint":false},{"year":2021,"finding":"STOML2 interacts directly with PHB (prohibitin 1) as confirmed by co-immunoprecipitation and co-localization, and both proteins activate the MAPK signaling pathway (RAF1-MEK1/2-ERK1/2 phosphorylation) to promote colorectal cancer cell proliferation.","method":"Yeast two-hybrid screen, co-immunoprecipitation, immunofluorescence co-localization, STOML2 knockdown/overexpression, organoid culture, orthotopic model, RAF inhibitor (Sorafenib) treatment, immunoblotting for MAPK pathway","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2/3 — yeast two-hybrid plus confirmatory Co-IP establishes interaction; functional readout via MAPK phosphorylation and in vivo model; single lab","pmids":["34781982"],"is_preprint":false},{"year":2023,"finding":"PHB1 binds β-catenin directly (confirmed by immunoprecipitation) and stabilizes it by inhibiting ubiquitin-mediated proteasomal degradation, thereby activating Wnt/β-catenin signaling to promote epithelial-mesenchymal transition (EMT), invasion, and metastasis in bladder cancer; β-catenin knockdown reverses PHB1 overexpression-driven cancer aggressiveness.","method":"Co-immunoprecipitation, immunofluorescence, PHB1 knockdown/overexpression, transwell/wound-healing assays, nude mouse lung metastasis model, western blotting for EMT and Wnt/β-catenin markers","journal":"Pathology, research and practice","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP confirms PHB1–β-catenin binding, rescue experiment confirms pathway dependency, in vivo model; single lab","pmids":["37235908"],"is_preprint":false},{"year":2022,"finding":"Arctigenin (phytoestrogen) activates estrogen receptor β (ERβ), which then competitively interacts with PHB1, disrupting TRIM21–PHB1 binding and blocking TRIM21-mediated ubiquitination of PHB1, thereby stabilizing PHB1 protein and inhibiting mitochondrial pathway-mediated apoptosis in intestinal goblet cells to preserve the mucus barrier in colitis.","method":"In vitro and in vivo IBD models, Co-immunoprecipitation, ubiquitination assays, ERβ knockdown in colonic tissue (DSS-colitis mice), western blotting","journal":"Phytotherapy research : PTR","confidence":"Medium","confidence_rationale":"Tier 2/3 — mechanistic Co-IP and ubiquitination assays, in vivo ERβ knockdown confirms pathway; single lab; replicates TRIM21 as PHB1 E3 ligase found in prior study","pmids":["35599350"],"is_preprint":false},{"year":2024,"finding":"Yeast Phb1 (ortholog of human PHB1) and Phb2 function as novel Atg8 (LC3) receptors to sustain mitophagy in Saccharomyces cerevisiae: both contain a conserved AIM/LIR-like motif, physically interact and co-localize with Atg8 at mitochondria, and their complex formation is required for mitophagy. Additionally, prohibitins negatively regulate basal C-terminal processing of the mitophagy receptor Atg32 by the rhomboid protease Pcp1, with absence of prohibitins causing hyperactivated Atg32 processing.","method":"Genetic deletion of PHB1/PHB2, mitophagy flux assays, Co-immunoprecipitation of Phb1/Phb2 with Atg8, mitochondrial co-localization imaging, AIM/LIR motif mutagenesis, Yme1/Pcp1 epistasis analysis, Atg32 processing assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including Co-IP, mutagenesis, epistasis, and flux assays; highly conserved ortholog study directly relevant to mammalian PHB1 function","pmids":["38964378"],"is_preprint":false}],"current_model":"PHB1 (prohibitin 1) is a mitochondrial inner membrane scaffold protein that heterodimerizes with PHB2 to form large multimeric ring complexes (~12–14 copies each) serving as membrane-bound chaperones that stabilize newly synthesized mitochondrial translation products against AAA protease-mediated degradation, support respiratory supercomplex assembly, regulate mitophagy (acting as an Atg8/LC3-interacting receptor via a conserved LIR motif), and suppress NLRP3 inflammasome activation; outside mitochondria, PHB1 also directly binds the eIF4F translation initiation complex to regulate MYC oncogene translation, associates with β-catenin to stabilize Wnt signaling, interacts with C-RAF to sustain MAPK/ERK phosphorylation, and is regulated by TRIM21-mediated ubiquitination (counteracted by LPLUNC1 or ERβ/arctigenin), with its tyrosine phosphorylation (PHB2-Tyr248) and serine phosphorylation (PHB1) modulated during T cell activation."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing the physical architecture and chaperone function of prohibitins resolved how PHB1 and PHB2 act at the mitochondrial inner membrane: they form a large multimeric ring complex that binds nascent mitochondrial translation products and shields them from AAA protease degradation.","evidence":"Biochemical fractionation, native molecular weight analysis, chaperone binding assays, and yeast genetics","pmids":["11852914"],"confidence":"High","gaps":["No atomic-resolution structure of the ring complex","Substrate specificity of the chaperone holdase activity undefined","Mechanism of AAA protease exclusion unknown"]},{"year":2007,"claim":"Mapping the phosphorylation status of PHB1 (serine) and PHB2 (Tyr248) in human T cells and showing that knockdown collapses mitochondrial membrane potential established that post-translational modification of the PHB complex regulates mitochondrial integrity in immune cells.","evidence":"Subcellular fractionation, electron microscopy, mass spectrometry phosphosite mapping, site-directed mutagenesis, siRNA knockdown in human T cells","pmids":["18086671"],"confidence":"High","gaps":["Kinase(s) responsible for PHB1 serine phosphorylation not identified","Functional consequence of individual phosphosites not dissected by phospho-dead mutants in vivo"]},{"year":2017,"claim":"Demonstrating that PHB complex deficiency impairs respiratory supercomplex assembly without reducing individual complex subunit levels pinpointed the PHB ring as a dedicated scaffold for supercomplex organization, linking it to elevated ROS production.","evidence":"PHB1/PHB2 siRNA, blue native PAGE for supercomplex assessment, mitoflash imaging, ROS measurement, rescue by PHB1+PHB2 co-expression","pmids":["28630166"],"confidence":"High","gaps":["Mechanism by which PHB ring promotes supercomplex assembly is unclear","Whether PHB directly contacts respiratory complex subunits or acts via lipid remodeling is unresolved"]},{"year":2019,"claim":"Identification of TRIM21 as the E3 ubiquitin ligase targeting PHB1 for proteasomal degradation, and of LPLUNC1 as a competitive inhibitor of this ubiquitination, revealed the first regulated turnover mechanism for PHB1 protein levels.","evidence":"Reciprocal Co-IP, in vivo ubiquitination assays, competitive binding assays, NF-κB reporter rescue in nasopharyngeal carcinoma cells","pmids":["30886235"],"confidence":"High","gaps":["Specific ubiquitinated lysine residues on PHB1 not mapped","Whether TRIM21-PHB1 axis operates in non-cancer cell types not shown"]},{"year":2019,"claim":"Showing that PHB1 physically interacts with C-RAF and sustains MEK-ERK phosphorylation downstream of FoxM1 transcriptional activation positioned PHB1 as a signaling scaffold in the RAS-MAPK pathway, with functional relevance to drug resistance.","evidence":"ChIP for FoxM1 binding to PHB1 promoter, Co-IP of PHB1–C-RAF, PHB1 knockdown/overexpression, paclitaxel resistance assays in pancreatic cancer","pmids":["31334335"],"confidence":"Medium","gaps":["Structural basis of PHB1–C-RAF interaction unknown","Whether this interaction is direct or bridged by other partners not resolved","Single-lab observation"]},{"year":2021,"claim":"Independent confirmation that PHB1 activates RAF1-MEK-ERK signaling via direct interaction with STOML2 broadened the picture of PHB1 as a mitochondrial-to-cytoplasmic signaling node and identified a second mitochondrial partner (STOML2/SLP2) linking PHB1 to MAPK output.","evidence":"Yeast two-hybrid, reciprocal Co-IP, immunofluorescence co-localization, RAF inhibitor treatment in colorectal cancer cells and organoids","pmids":["34781982"],"confidence":"Medium","gaps":["Whether PHB1–STOML2–RAF axis operates outside colorectal cancer is untested","Stoichiometry of the PHB1–STOML2 complex relative to the PHB ring unknown"]},{"year":2022,"claim":"Discovery that CHCHD10 and SLP2 cooperatively stabilize the PHB complex, and that the ALS/FTD mutation CHCHD10-S59L causes PHB–SLP2 aggregation triggering OMA1-OPA1 processing and motor neuron death, connected PHB complex integrity to neurodegenerative disease pathogenesis.","evidence":"Patient fibroblasts, Chchd10-S59L knock-in mouse, reciprocal Co-IP, electron microscopy of cristae, OMA1/OPA1 processing assays, spinal cord histology","pmids":["35656794"],"confidence":"High","gaps":["Whether PHB stabilization rescues the CHCHD10-mutant phenotype not tested","Relevance to sporadic ALS unknown"]},{"year":2022,"claim":"Replication of TRIM21 as the PHB1 E3 ligase in a second biological context—where ERβ activation by arctigenin competitively disrupts TRIM21–PHB1 binding—validated the regulated ubiquitination mechanism and extended it to intestinal epithelial homeostasis.","evidence":"Co-IP, ubiquitination assays, ERβ knockdown in DSS-colitis mice, mucus barrier assessment","pmids":["35599350"],"confidence":"Medium","gaps":["Whether ERβ binds the same PHB1 surface as TRIM21 not structurally resolved","Relative contributions of PHB1 stabilization versus other ERβ targets to mucosal protection unclear"]},{"year":2023,"claim":"Multiple studies converged on PHB1 as a guardian against innate immune activation: PHB1 loss increases cytoplasmic mtDNA that triggers NLRP3 inflammasome and cGAS-STING pathways, while PHB1 interaction with Sam50 at the outer membrane prevents mtDNA escape through mPTP and BAX pores.","evidence":"PHB1 siRNA, cytoplasmic mtDNA quantification, mitophagy inhibitor epistasis, Sam50 Co-IP, mPTP/BAX pore assays, mouse sepsis and renal models","pmids":["37359543","38820047"],"confidence":"Medium","gaps":["Whether PHB1–Sam50 interaction is direct or mediated through the PHB ring is unclear","Relative contribution of mitophagy promotion versus mtDNA retention to immune suppression not separated"]},{"year":2023,"claim":"Demonstrating that PHB1 directly associates with the eIF4F translation initiation complex to regulate MYC mRNA translation—independently of RAS-RAF-MAPK—revealed a previously unsuspected cytoplasmic moonlighting function of PHB1 in cap-dependent translation control.","evidence":"Co-IP of PHB with eIF4F components, multiomics (transcriptomics, proteomics, translatomics), FL3 pharmacological inhibition and PHB knockdown in CLL cells, in vivo CLL mouse model","pmids":["37084385"],"confidence":"High","gaps":["Structural basis of PHB1–eIF4F interaction unresolved","Whether this function operates in non-hematological cells unknown","Mechanism discriminating mRNA targets for PHB1-dependent translation not defined"]},{"year":2023,"claim":"Identification of PHB1 as a direct β-catenin-binding partner that stabilizes β-catenin by blocking its ubiquitin-mediated degradation added Wnt signaling activation to PHB1's extra-mitochondrial repertoire.","evidence":"Co-IP, PHB1 overexpression/knockdown, β-catenin rescue, nude mouse metastasis model in bladder cancer","pmids":["37235908"],"confidence":"Medium","gaps":["Domain on PHB1 mediating β-catenin binding not mapped","Whether this interaction occurs in normal epithelial cells or is cancer-specific is unknown"]},{"year":2024,"claim":"Discovery that yeast Phb1/Phb2 function as bona fide Atg8 receptors via conserved AIM/LIR motifs, and that they negatively regulate Atg32 processing by the rhomboid protease Pcp1, established prohibitins as direct mediators—not merely permissive scaffolds—of mitophagy.","evidence":"Genetic deletion, Co-IP of Phb1/Phb2 with Atg8, AIM/LIR motif mutagenesis, mitophagy flux assays, Yme1/Pcp1 epistasis in S. cerevisiae","pmids":["38964378"],"confidence":"High","gaps":["Conservation of the LIR-dependent mitophagy receptor function in mammalian PHB1 awaits direct demonstration","Relative importance of PHB1 versus canonical mitophagy receptors (BNIP3, FUNDC1) not compared"]},{"year":null,"claim":"A high-resolution structure of the PHB1/PHB2 ring complex is lacking, the molecular logic by which PHB1 partitions between mitochondrial and cytoplasmic functions is unknown, and the identity of kinases phosphorylating PHB1 remains to be determined.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of mammalian PHB ring","No mechanism explaining how PHB1 distributes between mitochondrial and cytoplasmic pools","Kinases for PHB1 serine phosphorylation unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,6,12]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,3,8]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,3,8,10,15]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,3,8]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[9,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,12,13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,10]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,14]}],"complexes":["PHB1/PHB2 prohibitin ring complex","eIF4F translation initiation complex"],"partners":["PHB2","TRIM21","STOML2","CHCHD10","RAF1","CTNNB1","SAM50"],"other_free_text":[]},"mechanistic_narrative":"PHB1 (prohibitin 1) is a multifunctional scaffold protein that assembles with PHB2 into large ring-shaped complexes (~12–14 copies each) at the mitochondrial inner membrane, where it chaperones newly synthesized mitochondrial translation products, stabilizes respiratory supercomplexes, maintains cristae architecture, and promotes mitophagy as an Atg8/LC3 receptor via a conserved LIR motif [PMID:11852914, PMID:28630166, PMID:38964378]. PHB1 protein turnover is controlled by TRIM21-mediated ubiquitination, which is competitively blocked by LPLUNC1 or ERβ binding, and PHB1 loss leads to cytoplasmic mtDNA release that activates both NLRP3 inflammasome and cGAS-STING innate immune pathways [PMID:30886235, PMID:37359543, PMID:38820047]. Outside mitochondria, PHB1 directly associates with the eIF4F translation initiation complex to regulate MYC mRNA translation, binds β-catenin to stabilize Wnt signaling, and interacts with C-RAF to sustain MEK-ERK pathway activation [PMID:37084385, PMID:37235908, PMID:31334335]. The PHB complex is stabilized by SLP2/CHCHD10, and destabilization of this interaction—as caused by the ALS/FTD-linked CHCHD10 p.Ser59Leu mutation—triggers OMA1-dependent OPA1 processing, mitochondrial fragmentation, and motor neuron death [PMID:35656794]."},"prefetch_data":{"uniprot":{"accession":"P35232","full_name":"Prohibitin 1","aliases":[],"length_aa":272,"mass_kda":29.8,"function":"Protein with pleiotropic attributes mediated in a cell-compartment- and tissue-specific manner, which include the plasma membrane-associated cell signaling functions, mitochondrial chaperone, and transcriptional co-regulator of transcription factors in the nucleus (PubMed:11302691, PubMed:20959514, PubMed:28017329, PubMed:31522117). Plays a role in adipose tissue and glucose homeostasis in a sex-specific manner (By similarity). Contributes to pulmonary vascular remodeling by accelerating proliferation of pulmonary arterial smooth muscle cells (By similarity) In the mitochondria, together with PHB2, forms large ring complexes (prohibitin complexes) in the inner mitochondrial membrane (IMM) and functions as a chaperone protein that stabilizes mitochondrial respiratory enzymes and maintains mitochondrial integrity in the IMM, which is required for mitochondrial morphogenesis, neuronal survival, and normal lifespan (Probable). The prohibitin complex, with DNAJC19, regulates cardiolipin remodeling and the protein turnover of OMA1 in a cardiolipin-binding manner (By similarity). Regulates mitochondrial respiration activity playing a role in cellular aging (PubMed:11302691). The prohibitin complex plays a role of mitophagy receptor involved in targeting mitochondria for autophagic degradation (PubMed:28017329). Involved in mitochondrial-mediated antiviral innate immunity, activates RIG-I-mediated signal transduction and production of IFNB1 and pro-inflammatory cytokine IL6 (PubMed:31522117) In the nucleus, acts as a transcription coregulator, enhances promoter binding by TP53, a transcription factor it activates, but reduces the promoter binding by E2F1, a transcription factor it represses (PubMed:14500729). Interacts with STAT3 to affect IL17 secretion in T-helper Th17 cells (PubMed:31899195) In the plasma membrane, cooperates with CD86 to mediate CD86-signaling in B lymphocytes that regulates the level of IgG1 produced through the activation of distal signaling intermediates (By similarity). Upon CD40 engagement, required to activate NF-kappa-B signaling pathway via phospholipase C and protein kinase C activation (By similarity)","subcellular_location":"Mitochondrion inner membrane; Nucleus; Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P35232/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PHB1","classification":"Common Essential","n_dependent_lines":1207,"n_total_lines":1208,"dependency_fraction":0.9991721854304636},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PHB1","total_profiled":1310},"omim":[{"mim_id":"617081","title":"OMA1 ZINC METALLOPEPTIDASE; OMA1","url":"https://www.omim.org/entry/617081"},{"mim_id":"614461","title":"UBIQUINOL-CYTOCHROME C REDUCTASE COMPLEX ASSEMBLY FACTOR 2; UQCC2","url":"https://www.omim.org/entry/614461"},{"mim_id":"610704","title":"PROHIBITIN 2; PHB2","url":"https://www.omim.org/entry/610704"},{"mim_id":"608292","title":"STOMATIN-LIKE PROTEIN 2; STOML2","url":"https://www.omim.org/entry/608292"},{"mim_id":"176705","title":"PROHIBITIN; PHB","url":"https://www.omim.org/entry/176705"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PHB1"},"hgnc":{"alias_symbol":["BAP32"],"prev_symbol":["PHB"]},"alphafold":{"accession":"P35232","domains":[{"cath_id":"-","chopping":"21-69","consensus_level":"medium","plddt":87.3608,"start":21,"end":69},{"cath_id":"3.30.479.30","chopping":"71-175","consensus_level":"high","plddt":92.3086,"start":71,"end":175},{"cath_id":"1.20.5","chopping":"187-218","consensus_level":"medium","plddt":95.5925,"start":187,"end":218}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P35232","model_url":"https://alphafold.ebi.ac.uk/files/AF-P35232-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P35232-F1-predicted_aligned_error_v6.png","plddt_mean":89.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PHB1","jax_strain_url":"https://www.jax.org/strain/search?query=PHB1"},"sequence":{"accession":"P35232","fasta_url":"https://rest.uniprot.org/uniprotkb/P35232.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P35232/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P35232"}},"corpus_meta":[{"pmid":"2848014","id":"PMC_2848014","title":"Cloning of the Alcaligenes eutrophus genes for synthesis of poly-beta-hydroxybutyric acid (PHB) and synthesis of PHB in Escherichia coli.","date":"1988","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/2848014","citation_count":295,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11852914","id":"PMC_11852914","title":"The mitochondrial PHB complex: roles in mitochondrial respiratory complex assembly, ageing and degenerative disease.","date":"2002","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/11852914","citation_count":252,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16101677","id":"PMC_16101677","title":"Flotillins and the PHB domain protein family: rafts, worms and anaesthetics.","date":"2005","source":"Traffic (Copenhagen, 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directly to newly synthesized mitochondrial translation products and stabilizing them against degradation by membrane-bound AAA metalloproteases.\",\n      \"method\": \"Native molecular weight determination, direct binding assays, functional complementation in yeast\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, replicated across labs, foundational review synthesizing direct experimental evidence\",\n      \"pmids\": [\"11852914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PHB1 and PHB2 localize to the mitochondrial inner membrane of human T cells (not the nucleus), and siRNA-mediated knockdown of PHBs disrupts mitochondrial membrane potential, demonstrating a role in maintaining mitochondrial integrity. PHB1 is serine-phosphorylated and PHB2 is serine- and tyrosine-phosphorylated (Tyr248 on PHB2), forming a phosphocomplex.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, electron microscopy, siRNA knockdown, orthophosphate labeling, phosphoamino acid analysis, mass spectrometry, site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including mutagenesis, fractionation, and functional knockdown phenotype in a single study\",\n      \"pmids\": [\"18086671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PHB complex deficiency impairs mitochondrial respiratory supercomplex (RSC) formation without altering individual respiratory complex subunit abundance, leading to elevated basal ROS production and increased mitoflash frequency. Co-expression of both PHB1 and PHB2 rescues these defects, indicating the multimeric PHB complex is the functional unit.\",\n      \"method\": \"siRNA knockdown, live-cell mitoflash imaging, Blue Native PAGE for supercomplex analysis, ROS measurement, co-expression rescue\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with rescue experiment confirming mechanism\",\n      \"pmids\": [\"28630166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM21 acts as an E3 ubiquitin ligase mediating PHB1 ubiquitination and degradation. LPLUNC1 stabilizes PHB1 by competitively inhibiting TRIM21 binding to PHB1 due to stronger binding affinity, thereby suppressing PHB1 ubiquitination and increasing PHB1 protein levels.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, competitive binding assay, siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reciprocal Co-IP and functional ubiquitination assay from a single lab\",\n      \"pmids\": [\"30886235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PHB1 overexpression in rat granulosa cells inhibits apoptosis by activating MEK-ERK1/2 signaling, increasing anti-apoptotic Bcl-2 and Bcl-xL levels, reducing cytochrome c release from mitochondria, and inhibiting caspase-3 activity. PHB1 silencing causes mitochondrial fragmentation and sensitizes cells to apoptosis.\",\n      \"method\": \"Overexpression, siRNA knockdown, microarray, immunoblot, caspase activity assay, mitochondrial morphology imaging\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple methods but single lab, pathway placement via gain- and loss-of-function\",\n      \"pmids\": [\"24096434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FoxM1 binds the PHB1 promoter and enhances PHB1 expression at transcriptional and post-transcriptional levels. PHB1 interacts with C-RAF and promotes phosphorylation of ERK1/2, thereby contributing to paclitaxel resistance in pancreatic cancer cells.\",\n      \"method\": \"ChIP, Co-immunoprecipitation, PHB1 knockdown, luciferase reporter, immunoblot for p-ERK1/2\",\n      \"journal\": \"Molecular therapy oncolytics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct promoter binding shown by ChIP, protein interaction by Co-IP, functional rescue by PHB1 KD; single lab\",\n      \"pmids\": [\"31334335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD10 interacts with SLP2 (Stomatin-Like Protein 2) and participates in the stability of the PHB complex in the inner mitochondrial membrane. Destabilization of the PHB complex (in CHCHD10 S59L mutant) leads to OMA1 cascade activation, OPA1 processing, mitochondrial fragmentation, abnormal cristae morphogenesis, and motor neuron death.\",\n      \"method\": \"Co-immunoprecipitation, patient fibroblasts, mouse models, histological analysis of spinal cord and hippocampus, mitochondrial fractionation\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods across patient and mouse models, mechanistic pathway placed by epistasis\",\n      \"pmids\": [\"35656794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 knockdown increases cytoplasmic mtDNA levels and enhances NLRP3 inflammasome activation. A mitophagy inhibitor abolishes PHB1 knockdown-mediated NLRP3 activation, indicating PHB1 inhibits NLRP3 inflammasome activity through mitophagy.\",\n      \"method\": \"siRNA knockdown, mtDNA quantification in cytoplasm, NLRP3 inflammasome activation assay, mitophagy inhibitor treatment\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional epistasis with inhibitor, single lab, mechanism of PHB1 action placed in mitophagy-NLRP3 pathway\",\n      \"pmids\": [\"37359543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 (prohibitin) directly associates with the eIF4F translation initiation complex. PHB knockdown phenocopies treatment with the PHB-binding drug FL3, reducing MYC mRNA translation. In CLL, this PHB-eIF4F interaction regulates translation of MYC and cell-cycle/metabolic proteins independent of the RAS-RAF-MAPK pathway.\",\n      \"method\": \"Co-immunoprecipitation of PHB with eIF4F components, multiomics (proteomics + transcriptomics), PHB siRNA knockdown, pharmacological inhibition with FL3, in vivo CLL mouse model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP of PHB with eIF4F complex, KD phenocopy of drug, multiple orthogonal omics methods, in vivo validation\",\n      \"pmids\": [\"37084385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Yeast Phb1 and Phb2 (orthologs of mammalian PHB1/PHB2) function as Atg8 receptors to support mitophagy in S. cerevisiae, requiring formation of the Phb1-Phb2 complex and a conserved AIM/LIR-like motif in both proteins. In the absence of prohibitins, the i-AAA protease Yme1-dependent and rhomboid protease Pcp1-dependent processing of the mitophagy receptor Atg32 is enhanced.\",\n      \"method\": \"Genetic deletion, Co-immunoprecipitation of Phb1/Phb2 with Atg8, fluorescence colocalization, AIM/LIR motif mutagenesis, epistasis with yme1 and pcp1 mutants\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, colocalization, mutagenesis, genetic epistasis) in a single study with yeast ortholog\",\n      \"pmids\": [\"38964378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HDAC6 downregulates PHB1 expression and function, impairing PHB1-mediated mitochondrial respiratory chain activity and increasing oxidant production, thereby promoting sepsis development. Inhibition of HDAC6 attenuates sepsis by restoring PHB1 function.\",\n      \"method\": \"qRT-PCR, western blotting, CLP sepsis rat model, mitochondrial respiratory control rate measurement, HDAC6 inhibition\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional link between HDAC6 and PHB1 shown in vivo with mechanistic respiratory chain readout; single lab\",\n      \"pmids\": [\"32221047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PHB1 interacts with STOML2 in colorectal cancer cells; co-immunoprecipitation confirmed the PHB-STOML2 complex and co-localization was shown at the cellular level. STOML2 knockdown downregulates phosphorylation of RAF1, MEK1/2, and ERK1/2, indicating PHB participates in MAPK pathway activation in this context.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, immunofluorescence co-localization, immunoblot for MAPK phosphorylation, gain- and loss-of-function\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP confirmed interaction; MAPK pathway placement by KD; single lab\",\n      \"pmids\": [\"34781982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 (prohibitin 1) binds to β-catenin directly (shown by immunoprecipitation) and stabilizes it by inhibiting ubiquitin-mediated degradation of β-catenin, thereby activating Wnt/β-catenin signaling and promoting bladder cancer cell EMT, migration, and invasion.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, gene knockdown and overexpression, transwell/wound healing assays, nude mouse lung metastasis model, western blot\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct protein interaction shown by Co-IP with functional epistasis (β-catenin KD reverses PHB1 OE phenotype); single lab\",\n      \"pmids\": [\"37235908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PHB1 protein levels are stabilized by estrogen receptor β (ERβ) activation, which competitively interacts with PHB1 and disrupts TRIM21 binding, blocking TRIM21-mediated ubiquitination of PHB1. This PHB1 stabilization inhibits mitochondrial pathway apoptosis in goblet cells.\",\n      \"method\": \"ERβ knockdown in vivo (DSS colitis mice), co-immunoprecipitation, competitive binding assay, apoptosis assay\",\n      \"journal\": \"Phytotherapy research : PTR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — competitive Co-IP with in vivo ERβ KD validation; single lab\",\n      \"pmids\": [\"35599350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PHB1 protein (prohibitin) interacts with viral RNA of Japanese encephalitis virus and is elevated during JEV infection of human neural stem cells, participating in ER stress-induced apoptosis.\",\n      \"method\": \"2D gel electrophoresis proteomics, mass spectrometry, co-immunoprecipitation with viral RNA, in vivo validation in mouse SVZ and human autopsy samples\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — protein identified by proteomics; interaction with viral RNA shown but PHB1 mechanistic role in apoptosis not dissected\",\n      \"pmids\": [\"28102850\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PHB1 (prohibitin 1) forms a large multimeric ring complex with PHB2 in the mitochondrial inner membrane, where it acts as a scaffold/chaperone stabilizing newly synthesized mitochondrial translation products against AAA protease degradation, supports respiratory supercomplex assembly, regulates mitophagy (through direct interaction with Atg8/LC3 via AIM/LIR motifs), and controls NLRP3 inflammasome activation via mitophagy; in the nucleus and cytoplasm PHB1 additionally modulates signaling (RAF-MEK-ERK/MAPK, Wnt/β-catenin) and translation initiation by associating with the eIF4F complex, while its protein stability is regulated by TRIM21-mediated ubiquitination counteracted by binding partners such as LPLUNC1 and ERβ.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries from KEEP papers only.\n\n**Classification:**\n\nThe gene of interest is PHB1 (Prohibitin 1), the human/mammalian mitochondrial inner membrane scaffold protein.\n\nMost papers in the retrieved corpus (papers 1, 4-13, 16-19, 21-22, 24-29, 31-44, 46-48, 50, 52-53, 55-56, 58-63, 65-67, 69-72, 74, 76-78, 82-83, 85-90, 92-93, 96-100) describe bacterial/plant polyhydroxybutyrate (PHB) biopolymer — SYMBOL COLLISION with bacterial PHB genes. EXCLUDE.\n\nPapers about canonical PHB1 (prohibitin 1) protein:\n- PMID:11852914 (2): PHB complex, mitochondrial chaperone — KEEP\n- PMID:16101677 (3): PHB domain family, flotillins — KEEP (relevant to PHB domain)\n- PMID:18086671 (6): PHB1/PHB2 phosphocomplex in T cells — KEEP\n- PMID:8244394 (14): Human PHB gene family — KEEP\n- PMID:30501123 (15): PHB complex, mitochondrial quality control — KEEP\n- PMID:28102850 (20): JEV, PHB (prohibitin) interaction with viral RNA — KEEP\n- PMID:30886235 (26): LPLUNC1/PHB1/TRIM21/NF-κB — KEEP\n- PMID:24096434 (30): PHB inhibits apoptosis in granulosa cells — KEEP\n- PMID:31334335 (34): FoxM1/PHB1/RAF-MEK-ERK pathway — KEEP\n- PMID:28630166 (23): PHB complex, respiratory supercomplexes, mitoflashes — KEEP\n- PMID:35656794 (54): CHCHD10/SLP2/PHB complex stability — KEEP\n- PMID:37359543 (68): PHB1 as NLRP3 inflammasome inhibitor via mitophagy — KEEP\n- PMID:38820047 (73): Lycopene/Sam50/PHB1/mtDNA — KEEP\n- PMID:37084385 (75): PHB/eIF4F complex, MYC translation in CLL — KEEP\n- PMID:32221047 (79): HDAC6/PHB1/mitochondrial respiratory chain — KEEP\n- PMID:34781982 (81): STOML2/PHB/MAPK in colorectal cancer — KEEP\n- PMID:37235908 (64): PHB/β-catenin/Wnt signaling in bladder cancer — KEEP\n- PMID:35599350 (84): ERβ/TRIM21/PHB1 in goblet cells — KEEP\n- PMID:34122065 (94): PHB/mitochondria/apoptosis in gastric cancer — KEEP\n- PMID:26496733 (91): PHB roles in granulosa cell physiology — KEEP (review, limited mechanistic detail)\n- PMID:27557820 (99): PHB in cardiovascular diseases — KEEP (review)\n- PMID:38964378 (95): Yeast Phb1/Phb2 as Atg8 receptors for mitophagy — KEEP (ortholog)\n\n**gene2pubmed additional papers:**\n- PMID:17081983: global phosphoproteomics — EXCLUDE (no PHB1-specific mechanism)\n- PMID:12477932: MGC cDNA — EXCLUDE\n- PMID:21906983: ubiquitinome — EXCLUDE\n- PMID:20562859: autophagy interactome — EXCLUDE\n- PMID:19615732: DUB interactome — EXCLUDE\n- PMID:26186194, 28514442, 26496610, 33961781: BioPlex interactomes — EXCLUDE (large-scale, no PHB1-specific mechanism extracted)\n- PMID:19430483: GWAS blood pressure — EXCLUDE\n- PMID:32296183: HuRI — EXCLUDE\n- PMID:29507755: m6A — EXCLUDE\n- PMID:11076863: DNA cloning — EXCLUDE\n- PMID:11790298: nucleolus proteome — EXCLUDE\n- PMID:21890473: ubiquitylation — EXCLUDE\n- PMID:28017329: PHB2 as mitophagy receptor — this is PHB2 (prohibitin 2), not PHB1. However, it describes the PHB complex and is foundational to understanding PHB1 function context. EXCLUDE (specifically about PHB2)\n- PMID:22939629: human soluble protein complexes — EXCLUDE\n- PMID:26472760: gene essentiality — EXCLUDE\n- PMID:21873635: GO — EXCLUDE\n- PMID:22190034: HIV interactome — EXCLUDE\n- PMID:29395067: mRNA granules BioID — EXCLUDE\n- PMID:28302793: splicing — EXCLUDE\n- PMID:33845483: SARS-CoV-2 proteomics — EXCLUDE\n- PMID:8125298: oligo-capping — EXCLUDE\n- PMID:23535732: prostate cancer GWAS — EXCLUDE\n- PMID:15489334: MGC — EXCLUDE\n- PMID:35271311: OpenCell — EXCLUDE\n- PMID:20360068: chromosome segregation — EXCLUDE\n- PMID:26344197: metazoan complexes — EXCLUDE\n- PMID:8889548: normalization/subtraction — EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"PHB1 (Phb1p) and PHB2 (Phb2p) form a large multimeric ring complex (~12–14 copies each) in the mitochondrial inner membrane that functions as a novel membrane-bound chaperone, binding directly to newly synthesized mitochondrial translation products and stabilizing them against degradation by membrane-bound AAA metalloproteases.\",\n      \"method\": \"Biochemical fractionation, native molecular weight analysis, chaperone binding assays, yeast genetic studies\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across multiple labs with biochemical and genetic evidence; review consolidating foundational mechanistic findings\",\n      \"pmids\": [\"11852914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PHB1 and PHB2 localize to the mitochondrial inner membrane of human T cells (not the nucleus as previously reported), are serine-phosphorylated (PHB1) and serine/tyrosine-phosphorylated (PHB2, mapped to Tyr248 by MS and mutagenesis), and siRNA-mediated knockdown disrupts mitochondrial membrane potential, establishing that the PHB1/PHB2 phosphocomplex is required for mitochondrial integrity in T cells.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, electron microscopy, orthophosphate labeling, phosphoamino acid analysis, mass spectrometry, site-directed mutagenesis, phospho-specific antibodies, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single study with mutagenesis validation of phosphorylation site and functional knockdown readout\",\n      \"pmids\": [\"18086671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PHB (prohibitin 1) inhibits apoptosis in undifferentiated rat granulosa cells through a PHB → MEK-ERK1/2 → Bcl-2/Bcl-xL pathway: PHB overexpression increases anti-apoptotic Bcl-2 and Bcl-xL, reduces cytochrome c release, and inhibits caspase-3 activity, while PHB silencing causes mitochondrial fragmentation and sensitizes cells to apoptosis.\",\n      \"method\": \"Microarray, immunoblot, ectopic overexpression, siRNA knockdown, flow cytometry, mitochondrial morphology imaging\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — multiple methods but single lab; pathway placement via overexpression and knockdown with defined molecular readouts\",\n      \"pmids\": [\"24096434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PHB complex deficiency impairs the formation of mitochondrial respiratory supercomplexes (RSCs) without altering the abundance of individual respiratory complex subunits, leading to elevated basal ROS production and increased mitochondrial flash (mitoflash) frequency up to 5.4-fold; the multimeric PHB1/PHB2 complex is the functional unit required for RSC assembly.\",\n      \"method\": \"PHB1/PHB2 siRNA knockdown, mitoflash imaging with fluorescent reporters, ROS measurement, blue native PAGE for RSC assessment, rescue by co-expression of PHB1 and PHB2\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal assays, rescue experiment establishes complex as functional unit, mechanistic link between PHB, RSC assembly, ROS, and mitoflash clearly delineated\",\n      \"pmids\": [\"28630166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Japanese encephalitis virus (JEV) infection induces ER stress in human neural stem cells, and prohibitin (PHB/PHB1) interacts with JEV viral RNA, implicating PHB1 as a participant in ER stress-induced apoptosis during viral infection.\",\n      \"method\": \"2D gel electrophoresis-based proteomics, mass spectrometry, in vivo validation in mice subventricular zone and human autopsy samples\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — proteomic identification without detailed mechanistic follow-up of PHB1-specific function\",\n      \"pmids\": [\"28102850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LPLUNC1 stabilizes PHB1 protein by competitively blocking TRIM21-mediated ubiquitination of PHB1; LPLUNC1 binds PHB1 with higher affinity than TRIM21, preventing TRIM21 from ubiquitinating PHB1 and thus its proteasomal degradation. Stabilized PHB1 suppresses NF-κB activity in nasopharyngeal carcinoma cells, and PHB1 depletion reverses the anti-tumor effects of LPLUNC1.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, competitive binding assays, siRNA knockdown, NF-κB reporter assays, rescue experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ubiquitination assay, competitive binding, and functional rescue across multiple experiments identify TRIM21 as E3 ligase for PHB1 and LPLUNC1 as its inhibitor\",\n      \"pmids\": [\"30886235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FoxM1 transcription factor binds the PHB1 promoter and enhances PHB1 expression at transcriptional and post-transcriptional levels; PHB1 then interacts with C-RAF and promotes ERK1/2 phosphorylation, driving paclitaxel resistance in pancreatic cancer cells. PHB1 knockdown sensitizes resistant cells to paclitaxel, and ABCA2-mediated drug efflux also operates downstream of the FoxM1/PHB1/RAF-MEK-ERK axis.\",\n      \"method\": \"ChIP (chromatin immunoprecipitation), Co-immunoprecipitation, PHB1 knockdown/overexpression, in vitro and in vivo drug resistance assays, ERK1/2 phosphorylation immunoblot\",\n      \"journal\": \"Molecular therapy oncolytics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — ChIP confirms direct promoter binding, Co-IP confirms PHB1–C-RAF interaction, functional rescue confirms pathway; single lab\",\n      \"pmids\": [\"31334335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HDAC6 downregulates PHB1 expression and function in sepsis; inhibition of HDAC6 restores PHB1-mediated mitochondrial respiratory chain function, reduces oxidant production, and protects against oxidative injury in a rat CLP sepsis model.\",\n      \"method\": \"qRT-PCR, western blotting, CLP sepsis model, HDAC6 inhibition, mitochondrial respiratory control rate measurement, histological analysis\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — in vivo model with functional mitochondrial readout; single lab, mechanistic link between HDAC6 and PHB1 established through pharmacological inhibition\",\n      \"pmids\": [\"32221047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD10 (an ALS/FTD gene product) interacts with SLP2 (Stomatin-Like Protein 2) and together stabilize the PHB complex in the mitochondrial inner membrane; the CHCHD10 p.Ser59Leu mutation causes SLP2-prohibitin aggregates, destabilizes the PHB complex, activates the OMA1 cascade with OPA1 processing, leads to mitochondrial fragmentation and abnormal cristae morphogenesis, and results in motor neuron death in spinal cord.\",\n      \"method\": \"Patient fibroblasts, Chchd10S59L/+ mouse model, co-immunoprecipitation, immunofluorescence, electron microscopy, in vivo hippocampus and spinal cord histology, OMA1/OPA1 processing assays\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, patient-derived cells and mouse model with defined molecular cascade from PHB complex destabilization to neuronal death\",\n      \"pmids\": [\"35656794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 knockdown increases cytoplasmic mtDNA levels and enhances NLRP3 inflammasome activation; mitophagy inhibitor treatment abolishes PHB1 knockdown-mediated NLRP3 activation, establishing that PHB1 suppresses NLRP3 inflammasome activation through promotion of mitophagy in the context of sepsis.\",\n      \"method\": \"PHB1 siRNA knockdown, cytoplasmic mtDNA quantification, NLRP3 inflammasome activation assays (IL-1β, caspase-1 cleavage), mitophagy inhibitor treatment, bioinformatic clustering of sepsis samples\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — mechanistic link via mitophagy inhibitor rescue experiment; single lab with functional knockdown and defined pathway\",\n      \"pmids\": [\"37359543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 physically interacts with Sam50 (mitochondrial outer membrane import channel) to stabilize mtDNA; lycopene reinforces this Sam50/PHB1 interaction to prevent mtDNA release into the cytoplasm via mPTP and BAX pores, thereby inhibiting cGAS-STING pathway activation and renal PANoptosis.\",\n      \"method\": \"Co-immunoprecipitation, mtDNA stability assays, mPTP/BAX pore measurements, cGAS-STING pathway readouts, mouse model (350 mice), lycopene treatment\",\n      \"journal\": \"Journal of agricultural and food chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP establishes Sam50/PHB1 interaction; in vivo model with defined molecular pathway; single lab\",\n      \"pmids\": [\"38820047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 and PHB2 (prohibitins) are directly associated with the eIF4F translation initiation complex in chronic lymphocytic leukemia (CLL) cells; pharmacological targeting of PHBs with the flavagline FL3 or PHB knockdown inhibits translation of MYC oncogene mRNA and other oncogenic mRNAs, arrests proliferation, and rewires MYC-driven metabolism, with the RAS-RAF-MAPK pathway not involved in translation regulation in this context.\",\n      \"method\": \"Multiomics (transcriptomics, proteomics, translatomics), Co-immunoprecipitation of PHB with eIF4F components, FL3 treatment, PHB1/PHB2 siRNA knockdown, in vivo CLL mouse model, patient CLL sample analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP establishing PHB-eIF4F interaction, phenotype replicated by knockdown and pharmacological inhibition, in vivo validation, multiple orthogonal omics approaches\",\n      \"pmids\": [\"37084385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STOML2 interacts directly with PHB (prohibitin 1) as confirmed by co-immunoprecipitation and co-localization, and both proteins activate the MAPK signaling pathway (RAF1-MEK1/2-ERK1/2 phosphorylation) to promote colorectal cancer cell proliferation.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, immunofluorescence co-localization, STOML2 knockdown/overexpression, organoid culture, orthotopic model, RAF inhibitor (Sorafenib) treatment, immunoblotting for MAPK pathway\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — yeast two-hybrid plus confirmatory Co-IP establishes interaction; functional readout via MAPK phosphorylation and in vivo model; single lab\",\n      \"pmids\": [\"34781982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHB1 binds β-catenin directly (confirmed by immunoprecipitation) and stabilizes it by inhibiting ubiquitin-mediated proteasomal degradation, thereby activating Wnt/β-catenin signaling to promote epithelial-mesenchymal transition (EMT), invasion, and metastasis in bladder cancer; β-catenin knockdown reverses PHB1 overexpression-driven cancer aggressiveness.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, PHB1 knockdown/overexpression, transwell/wound-healing assays, nude mouse lung metastasis model, western blotting for EMT and Wnt/β-catenin markers\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP confirms PHB1–β-catenin binding, rescue experiment confirms pathway dependency, in vivo model; single lab\",\n      \"pmids\": [\"37235908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Arctigenin (phytoestrogen) activates estrogen receptor β (ERβ), which then competitively interacts with PHB1, disrupting TRIM21–PHB1 binding and blocking TRIM21-mediated ubiquitination of PHB1, thereby stabilizing PHB1 protein and inhibiting mitochondrial pathway-mediated apoptosis in intestinal goblet cells to preserve the mucus barrier in colitis.\",\n      \"method\": \"In vitro and in vivo IBD models, Co-immunoprecipitation, ubiquitination assays, ERβ knockdown in colonic tissue (DSS-colitis mice), western blotting\",\n      \"journal\": \"Phytotherapy research : PTR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — mechanistic Co-IP and ubiquitination assays, in vivo ERβ knockdown confirms pathway; single lab; replicates TRIM21 as PHB1 E3 ligase found in prior study\",\n      \"pmids\": [\"35599350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Yeast Phb1 (ortholog of human PHB1) and Phb2 function as novel Atg8 (LC3) receptors to sustain mitophagy in Saccharomyces cerevisiae: both contain a conserved AIM/LIR-like motif, physically interact and co-localize with Atg8 at mitochondria, and their complex formation is required for mitophagy. Additionally, prohibitins negatively regulate basal C-terminal processing of the mitophagy receptor Atg32 by the rhomboid protease Pcp1, with absence of prohibitins causing hyperactivated Atg32 processing.\",\n      \"method\": \"Genetic deletion of PHB1/PHB2, mitophagy flux assays, Co-immunoprecipitation of Phb1/Phb2 with Atg8, mitochondrial co-localization imaging, AIM/LIR motif mutagenesis, Yme1/Pcp1 epistasis analysis, Atg32 processing assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including Co-IP, mutagenesis, epistasis, and flux assays; highly conserved ortholog study directly relevant to mammalian PHB1 function\",\n      \"pmids\": [\"38964378\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PHB1 (prohibitin 1) is a mitochondrial inner membrane scaffold protein that heterodimerizes with PHB2 to form large multimeric ring complexes (~12–14 copies each) serving as membrane-bound chaperones that stabilize newly synthesized mitochondrial translation products against AAA protease-mediated degradation, support respiratory supercomplex assembly, regulate mitophagy (acting as an Atg8/LC3-interacting receptor via a conserved LIR motif), and suppress NLRP3 inflammasome activation; outside mitochondria, PHB1 also directly binds the eIF4F translation initiation complex to regulate MYC oncogene translation, associates with β-catenin to stabilize Wnt signaling, interacts with C-RAF to sustain MAPK/ERK phosphorylation, and is regulated by TRIM21-mediated ubiquitination (counteracted by LPLUNC1 or ERβ/arctigenin), with its tyrosine phosphorylation (PHB2-Tyr248) and serine phosphorylation (PHB1) modulated during T cell activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PHB1 (prohibitin 1) is a multifunctional scaffold protein that forms a large ring-shaped complex with PHB2 in the mitochondrial inner membrane, where it stabilizes newly synthesized mitochondrial translation products against AAA protease degradation, supports respiratory supercomplex assembly to limit basal ROS production, and serves as an Atg8/LC3 receptor to promote mitophagy [PMID:11852914, PMID:28630166, PMID:38964378]. PHB1 loss impairs mitochondrial membrane potential, increases cytoplasmic mtDNA release, and enhances NLRP3 inflammasome activation through defective mitophagy [PMID:18086671, PMID:37359543]. Outside mitochondria, PHB1 associates with C-RAF to activate MEK-ERK signaling, binds β-catenin to stabilize Wnt signaling, and directly associates with the eIF4F translation initiation complex to regulate MYC mRNA translation in chronic lymphocytic leukemia [PMID:31334335, PMID:37235908, PMID:37084385]. PHB1 protein stability is controlled by TRIM21-mediated ubiquitination, which is competitively inhibited by LPLUNC1 or ERβ binding [PMID:30886235, PMID:35599350].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing the molecular architecture of the prohibitin complex resolved how PHB1 functions at the mitochondrial inner membrane: it forms a ~1-MDa ring with PHB2 that acts as a chaperone/holdase for newly synthesized mitochondrial proteins, protecting them from AAA protease degradation.\",\n      \"evidence\": \"Native molecular weight determination, direct binding assays, and functional complementation in yeast\",\n      \"pmids\": [\"11852914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural details of client recognition by the PHB ring remain unresolved\",\n        \"Whether chaperone activity requires ATP or cofactors was not addressed\",\n        \"Stoichiometric heterogeneity of the ring in mammalian cells was not determined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating exclusive mitochondrial inner membrane localization of PHB1 in human T cells and linking its knockdown to loss of mitochondrial membrane potential established PHB1 as essential for mitochondrial integrity in mammalian cells, while identifying its serine phosphorylation suggested regulatory modification.\",\n      \"evidence\": \"Subcellular fractionation, immunofluorescence, electron microscopy, siRNA knockdown, phosphoamino acid analysis, and mass spectrometry in human T cells\",\n      \"pmids\": [\"18086671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The kinase(s) responsible for PHB1 serine phosphorylation were not identified\",\n        \"Functional consequence of PHB1 phosphorylation on complex integrity was not tested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Gain- and loss-of-function experiments in granulosa cells placed PHB1 upstream of MEK-ERK1/2 signaling and anti-apoptotic Bcl-2 family members, establishing an extra-mitochondrial signaling role distinct from its chaperone function.\",\n      \"evidence\": \"Overexpression, siRNA knockdown, microarray, immunoblot, and caspase activity assay in rat granulosa cells\",\n      \"pmids\": [\"24096434\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding between PHB1 and MEK or ERK was not demonstrated in this study\",\n        \"Whether mitochondrial vs. cytoplasmic PHB1 pools mediate this effect was unresolved\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that PHB complex deficiency impairs respiratory supercomplex formation without reducing individual complex subunit levels, and that co-expression of both PHB1 and PHB2 rescues supercomplex assembly and ROS production, defined the intact ring complex as the functional unit for cristae organization.\",\n      \"evidence\": \"siRNA knockdown, Blue Native PAGE for supercomplex analysis, live-cell mitoflash imaging, and rescue by co-expression\",\n      \"pmids\": [\"28630166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The molecular contacts between the PHB ring and specific respiratory complexes were not mapped\",\n        \"Whether supercomplex defects are a direct scaffolding failure or an indirect lipid membrane effect was not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of TRIM21 as the E3 ligase mediating PHB1 ubiquitination, and of LPLUNC1 as a competitive inhibitor of TRIM21 binding, revealed the first mechanism controlling PHB1 protein turnover.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, and competitive binding assay\",\n      \"pmids\": [\"30886235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The specific ubiquitinated lysine residues on PHB1 were not mapped\",\n        \"In vivo validation of TRIM21-dependent PHB1 turnover in non-cancer cells was not provided\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"ChIP showing FoxM1 binds the PHB1 promoter, combined with Co-IP demonstrating PHB1 interaction with C-RAF and downstream ERK1/2 phosphorylation, provided a transcriptional-to-signaling axis linking PHB1 expression to RAF-MAPK pathway activation and drug resistance.\",\n      \"evidence\": \"ChIP, Co-immunoprecipitation, PHB1 knockdown, luciferase reporter, immunoblot in pancreatic cancer cells\",\n      \"pmids\": [\"31334335\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PHB1 directly activates C-RAF kinase activity or acts as a scaffold was not resolved\",\n        \"Generalizability beyond pancreatic cancer context unclear\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linking HDAC6 to PHB1 downregulation and impaired respiratory chain activity in a sepsis model established an epigenetic-level regulator of PHB1 function in an inflammatory disease context.\",\n      \"evidence\": \"HDAC6 inhibition, qRT-PCR, western blot, and mitochondrial respiratory control measurement in a CLP sepsis rat model\",\n      \"pmids\": [\"32221047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether HDAC6 acts directly on PHB1 gene expression or indirectly through deacetylation of an intermediate was not determined\",\n        \"Single lab, single model system\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of STOML2 as a physical partner of PHB1 by yeast two-hybrid and Co-IP, with STOML2 knockdown reducing RAF1-MEK-ERK phosphorylation, connected the PHB1-STOML2 axis to MAPK signaling in colorectal cancer.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence co-localization, gain- and loss-of-function in colorectal cancer cells\",\n      \"pmids\": [\"34781982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether STOML2 and PHB1 function as a complex or independently in MAPK signaling was not resolved\",\n        \"Single lab; pathway placement based on knockdown immunoblots without kinase activity assays\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that CHCHD10 interacts with SLP2 to stabilize the PHB complex, and that a disease-causing CHCHD10 S59L mutation destabilizes the complex leading to OMA1-OPA1 cascade activation, mitochondrial fragmentation, and motor neuron death, established the PHB complex as an upstream gatekeeper of cristae integrity in neurodegeneration.\",\n      \"evidence\": \"Co-immunoprecipitation, patient fibroblasts, mouse models, histological analysis, mitochondrial fractionation\",\n      \"pmids\": [\"35656794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PHB complex destabilization is sufficient for motor neuron death or requires additional CHCHD10-dependent pathways was not resolved\",\n        \"Direct structural interaction between PHB ring and OMA1 was not shown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showing that ERβ activation stabilizes PHB1 by competitively disrupting TRIM21 binding provided a second endogenous mechanism (besides LPLUNC1) for protecting PHB1 from ubiquitin-dependent degradation, with functional relevance to goblet cell survival.\",\n      \"evidence\": \"ERβ knockdown in DSS colitis mice, Co-IP competitive binding assay, apoptosis assay\",\n      \"pmids\": [\"35599350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The PHB1 domain mediating ERβ versus TRIM21 competition was not mapped\",\n        \"Whether ERβ-PHB1 interaction occurs in non-colitis contexts was not tested\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that PHB1 directly associates with the eIF4F translation initiation complex and that PHB1 knockdown reduces MYC mRNA translation in CLL revealed a previously unrecognized role for PHB1 in cap-dependent translation, independent of its known RAS-RAF-MAPK function.\",\n      \"evidence\": \"Reciprocal Co-IP of PHB1 with eIF4F components, multiomics, siRNA knockdown phenocopying FL3 drug treatment, in vivo CLL mouse model\",\n      \"pmids\": [\"37084385\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which eIF4F subunit directly contacts PHB1 was not determined\",\n        \"Whether PHB1 is a general translation modulator or specific to MYC-containing mRNAs was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connecting PHB1 loss to cytoplasmic mtDNA accumulation and enhanced NLRP3 inflammasome activation, abolished by a mitophagy inhibitor, placed PHB1-dependent mitophagy as a negative regulator of innate immune inflammation.\",\n      \"evidence\": \"siRNA knockdown, cytoplasmic mtDNA quantification, NLRP3 inflammasome activation assay, mitophagy inhibitor epistasis\",\n      \"pmids\": [\"37359543\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The molecular mechanism by which PHB1 promotes mitophagy in mammalian cells was not dissected\",\n        \"Single lab; contribution of cGAS-STING vs. NLRP3 to the phenotype was not fully resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing PHB1 binds β-catenin and inhibits its ubiquitin-mediated degradation to activate Wnt signaling expanded PHB1's extra-mitochondrial roles to a second major signaling pathway governing EMT and metastasis.\",\n      \"evidence\": \"Co-immunoprecipitation, gene knockdown/overexpression epistasis, nude mouse lung metastasis model in bladder cancer cells\",\n      \"pmids\": [\"37235908\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PHB1 directly competes with the β-catenin destruction complex or acts through an intermediate was not determined\",\n        \"Single cancer type studied\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of yeast Phb1/Phb2 as Atg8 receptors via conserved AIM/LIR motifs, with genetic epistasis showing that prohibitins protect the mitophagy receptor Atg32 from Yme1/Pcp1-dependent processing, provided the first direct molecular mechanism for prohibitin-mediated mitophagy.\",\n      \"evidence\": \"Co-IP of Phb1/Phb2 with Atg8, AIM/LIR motif mutagenesis, fluorescence colocalization, genetic epistasis with yme1Δ and pcp1Δ in S. cerevisiae\",\n      \"pmids\": [\"38964378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Conservation of the AIM/LIR-dependent mitophagy receptor function in mammalian PHB1 has not been demonstrated\",\n        \"Whether PHB1 and PHB2 serve redundant or distinct roles as Atg8 receptors was not fully resolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the high-resolution structure of the mammalian PHB1-PHB2 ring complex, the identity of the eIF4F subunit directly contacted by PHB1, whether AIM/LIR-dependent mitophagy receptor function is conserved from yeast to mammals, and the mechanisms that partition PHB1 between mitochondrial, cytoplasmic, and nuclear pools.\",\n      \"evidence\": \"Open questions based on current literature\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structural model of the mammalian PHB ring exists\",\n        \"Pool-specific functions (mitochondrial vs. cytoplasmic) have not been dissected with compartment-restricted mutants\",\n        \"Integration of PHB1's translation, signaling, and mitophagy roles into a unified regulatory framework is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5, 11, 12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 12]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 11, 12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 8, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\n      \"PHB1-PHB2 ring complex\",\n      \"eIF4F complex\"\n    ],\n    \"partners\": [\n      \"PHB2\",\n      \"TRIM21\",\n      \"RAF1\",\n      \"STOML2\",\n      \"CTNNB1\",\n      \"LPLUNC1\",\n      \"ESR2\",\n      \"CHCHD10\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"PHB1 (prohibitin 1) is a multifunctional scaffold protein that assembles with PHB2 into large ring-shaped complexes (~12–14 copies each) at the mitochondrial inner membrane, where it chaperones newly synthesized mitochondrial translation products, stabilizes respiratory supercomplexes, maintains cristae architecture, and promotes mitophagy as an Atg8/LC3 receptor via a conserved LIR motif [PMID:11852914, PMID:28630166, PMID:38964378]. PHB1 protein turnover is controlled by TRIM21-mediated ubiquitination, which is competitively blocked by LPLUNC1 or ERβ binding, and PHB1 loss leads to cytoplasmic mtDNA release that activates both NLRP3 inflammasome and cGAS-STING innate immune pathways [PMID:30886235, PMID:37359543, PMID:38820047]. Outside mitochondria, PHB1 directly associates with the eIF4F translation initiation complex to regulate MYC mRNA translation, binds β-catenin to stabilize Wnt signaling, and interacts with C-RAF to sustain MEK-ERK pathway activation [PMID:37084385, PMID:37235908, PMID:31334335]. The PHB complex is stabilized by SLP2/CHCHD10, and destabilization of this interaction—as caused by the ALS/FTD-linked CHCHD10 p.Ser59Leu mutation—triggers OMA1-dependent OPA1 processing, mitochondrial fragmentation, and motor neuron death [PMID:35656794].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing the physical architecture and chaperone function of prohibitins resolved how PHB1 and PHB2 act at the mitochondrial inner membrane: they form a large multimeric ring complex that binds nascent mitochondrial translation products and shields them from AAA protease degradation.\",\n      \"evidence\": \"Biochemical fractionation, native molecular weight analysis, chaperone binding assays, and yeast genetics\",\n      \"pmids\": [\"11852914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of the ring complex\", \"Substrate specificity of the chaperone holdase activity undefined\", \"Mechanism of AAA protease exclusion unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping the phosphorylation status of PHB1 (serine) and PHB2 (Tyr248) in human T cells and showing that knockdown collapses mitochondrial membrane potential established that post-translational modification of the PHB complex regulates mitochondrial integrity in immune cells.\",\n      \"evidence\": \"Subcellular fractionation, electron microscopy, mass spectrometry phosphosite mapping, site-directed mutagenesis, siRNA knockdown in human T cells\",\n      \"pmids\": [\"18086671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase(s) responsible for PHB1 serine phosphorylation not identified\", \"Functional consequence of individual phosphosites not dissected by phospho-dead mutants in vivo\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that PHB complex deficiency impairs respiratory supercomplex assembly without reducing individual complex subunit levels pinpointed the PHB ring as a dedicated scaffold for supercomplex organization, linking it to elevated ROS production.\",\n      \"evidence\": \"PHB1/PHB2 siRNA, blue native PAGE for supercomplex assessment, mitoflash imaging, ROS measurement, rescue by PHB1+PHB2 co-expression\",\n      \"pmids\": [\"28630166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PHB ring promotes supercomplex assembly is unclear\", \"Whether PHB directly contacts respiratory complex subunits or acts via lipid remodeling is unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of TRIM21 as the E3 ubiquitin ligase targeting PHB1 for proteasomal degradation, and of LPLUNC1 as a competitive inhibitor of this ubiquitination, revealed the first regulated turnover mechanism for PHB1 protein levels.\",\n      \"evidence\": \"Reciprocal Co-IP, in vivo ubiquitination assays, competitive binding assays, NF-κB reporter rescue in nasopharyngeal carcinoma cells\",\n      \"pmids\": [\"30886235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ubiquitinated lysine residues on PHB1 not mapped\", \"Whether TRIM21-PHB1 axis operates in non-cancer cell types not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing that PHB1 physically interacts with C-RAF and sustains MEK-ERK phosphorylation downstream of FoxM1 transcriptional activation positioned PHB1 as a signaling scaffold in the RAS-MAPK pathway, with functional relevance to drug resistance.\",\n      \"evidence\": \"ChIP for FoxM1 binding to PHB1 promoter, Co-IP of PHB1–C-RAF, PHB1 knockdown/overexpression, paclitaxel resistance assays in pancreatic cancer\",\n      \"pmids\": [\"31334335\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of PHB1–C-RAF interaction unknown\", \"Whether this interaction is direct or bridged by other partners not resolved\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Independent confirmation that PHB1 activates RAF1-MEK-ERK signaling via direct interaction with STOML2 broadened the picture of PHB1 as a mitochondrial-to-cytoplasmic signaling node and identified a second mitochondrial partner (STOML2/SLP2) linking PHB1 to MAPK output.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, immunofluorescence co-localization, RAF inhibitor treatment in colorectal cancer cells and organoids\",\n      \"pmids\": [\"34781982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PHB1–STOML2–RAF axis operates outside colorectal cancer is untested\", \"Stoichiometry of the PHB1–STOML2 complex relative to the PHB ring unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that CHCHD10 and SLP2 cooperatively stabilize the PHB complex, and that the ALS/FTD mutation CHCHD10-S59L causes PHB–SLP2 aggregation triggering OMA1-OPA1 processing and motor neuron death, connected PHB complex integrity to neurodegenerative disease pathogenesis.\",\n      \"evidence\": \"Patient fibroblasts, Chchd10-S59L knock-in mouse, reciprocal Co-IP, electron microscopy of cristae, OMA1/OPA1 processing assays, spinal cord histology\",\n      \"pmids\": [\"35656794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PHB stabilization rescues the CHCHD10-mutant phenotype not tested\", \"Relevance to sporadic ALS unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Replication of TRIM21 as the PHB1 E3 ligase in a second biological context—where ERβ activation by arctigenin competitively disrupts TRIM21–PHB1 binding—validated the regulated ubiquitination mechanism and extended it to intestinal epithelial homeostasis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, ERβ knockdown in DSS-colitis mice, mucus barrier assessment\",\n      \"pmids\": [\"35599350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ERβ binds the same PHB1 surface as TRIM21 not structurally resolved\", \"Relative contributions of PHB1 stabilization versus other ERβ targets to mucosal protection unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Multiple studies converged on PHB1 as a guardian against innate immune activation: PHB1 loss increases cytoplasmic mtDNA that triggers NLRP3 inflammasome and cGAS-STING pathways, while PHB1 interaction with Sam50 at the outer membrane prevents mtDNA escape through mPTP and BAX pores.\",\n      \"evidence\": \"PHB1 siRNA, cytoplasmic mtDNA quantification, mitophagy inhibitor epistasis, Sam50 Co-IP, mPTP/BAX pore assays, mouse sepsis and renal models\",\n      \"pmids\": [\"37359543\", \"38820047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PHB1–Sam50 interaction is direct or mediated through the PHB ring is unclear\", \"Relative contribution of mitophagy promotion versus mtDNA retention to immune suppression not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that PHB1 directly associates with the eIF4F translation initiation complex to regulate MYC mRNA translation—independently of RAS-RAF-MAPK—revealed a previously unsuspected cytoplasmic moonlighting function of PHB1 in cap-dependent translation control.\",\n      \"evidence\": \"Co-IP of PHB with eIF4F components, multiomics (transcriptomics, proteomics, translatomics), FL3 pharmacological inhibition and PHB knockdown in CLL cells, in vivo CLL mouse model\",\n      \"pmids\": [\"37084385\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PHB1–eIF4F interaction unresolved\", \"Whether this function operates in non-hematological cells unknown\", \"Mechanism discriminating mRNA targets for PHB1-dependent translation not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of PHB1 as a direct β-catenin-binding partner that stabilizes β-catenin by blocking its ubiquitin-mediated degradation added Wnt signaling activation to PHB1's extra-mitochondrial repertoire.\",\n      \"evidence\": \"Co-IP, PHB1 overexpression/knockdown, β-catenin rescue, nude mouse metastasis model in bladder cancer\",\n      \"pmids\": [\"37235908\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain on PHB1 mediating β-catenin binding not mapped\", \"Whether this interaction occurs in normal epithelial cells or is cancer-specific is unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that yeast Phb1/Phb2 function as bona fide Atg8 receptors via conserved AIM/LIR motifs, and that they negatively regulate Atg32 processing by the rhomboid protease Pcp1, established prohibitins as direct mediators—not merely permissive scaffolds—of mitophagy.\",\n      \"evidence\": \"Genetic deletion, Co-IP of Phb1/Phb2 with Atg8, AIM/LIR motif mutagenesis, mitophagy flux assays, Yme1/Pcp1 epistasis in S. cerevisiae\",\n      \"pmids\": [\"38964378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of the LIR-dependent mitophagy receptor function in mammalian PHB1 awaits direct demonstration\", \"Relative importance of PHB1 versus canonical mitophagy receptors (BNIP3, FUNDC1) not compared\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of the PHB1/PHB2 ring complex is lacking, the molecular logic by which PHB1 partitions between mitochondrial and cytoplasmic functions is unknown, and the identity of kinases phosphorylating PHB1 remains to be determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cryo-EM or crystal structure of mammalian PHB ring\", \"No mechanism explaining how PHB1 distributes between mitochondrial and cytoplasmic pools\", \"Kinases for PHB1 serine phosphorylation unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 6, 12]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 3, 8, 10, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 3, 8]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 12, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 14]}\n    ],\n    \"complexes\": [\n      \"PHB1/PHB2 prohibitin ring complex\",\n      \"eIF4F translation initiation complex\"\n    ],\n    \"partners\": [\n      \"PHB2\",\n      \"TRIM21\",\n      \"STOML2\",\n      \"CHCHD10\",\n      \"RAF1\",\n      \"CTNNB1\",\n      \"SAM50\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}