{"gene":"PCBP2","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2001,"finding":"hnRNP E2 (PCBP2) binds the 5'UTR of CEBPA mRNA and inhibits its translation, thereby suppressing C/EBPα protein expression in BCR-ABL-expressing myeloid precursor cells. BCR-ABL induces hnRNP E2 expression to mediate this translational block.","method":"Ectopic expression of hnRNP E2, Western blot for C/EBPα protein vs. CEBPA mRNA levels, functional differentiation assay","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple papers (PMIDs 11753385, 17475908, 20211135) with consistent mechanistic findings and functional readouts","pmids":["11753385"],"is_preprint":false},{"year":2007,"finding":"BCR/ABL-activated MAPK(ERK1/2) phosphorylates hnRNP E2 (PCBP2) at serines 173, 189, 272 and threonine 213, stabilizing the protein. Phosphorylation is required for hnRNP E2 binding to the 5'UTR of CEBPA mRNA; serine/threonine to alanine substitutions abolish phosphorylation, decrease hnRNP E2 stability, and restore C/EBPα expression and granulocytic differentiation.","method":"Site-directed mutagenesis (S→A substitutions), pharmacologic MAPK inhibition, in vitro/in vivo differentiation assays, binding assays to CEBPA 5'UTR","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis identifying specific phosphorylation sites, pharmacologic validation, functional rescue in primary patient cells and mouse models","pmids":["17475908"],"is_preprint":false},{"year":2010,"finding":"miR-328 acts as a decoy by binding directly to hnRNP E2 (PCBP2) in a seed-sequence-independent manner, competing with CEBPA mRNA for hnRNP E2 binding, thereby releasing CEBPA mRNA from hnRNP E2-mediated translational inhibition.","method":"RNA-protein interaction assays, rescue differentiation assays, miR-328 restoration in CML-BC blasts","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic dissection of RNA decoy activity replicated functionally in leukemic blasts with multiple readouts","pmids":["20211135"],"is_preprint":false},{"year":2011,"finding":"PCBP1 and PCBP2 function as iron chaperones that deliver Fe(II) to the HIF prolyl hydroxylases (PHD1/2/3) and asparaginyl hydroxylase FIH1. Depletion of PCBP1 or PCBP2 reduces PHD activity, impairs prolyl hydroxylation of HIF1α, and causes HIF1α accumulation; PHD activity is restored in vitro by adding purified Fe-PCBP1. PCBP1 physically binds PHD2 and FIH1 in vivo.","method":"RNAi depletion, in vitro activity reconstitution with purified Fe-PCBP1, co-immunoprecipitation (PCBP1 with PHD2/FIH1), HIF1α hydroxylation and degradation assays","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified protein, co-IP, loss-of-function, multiple orthogonal methods","pmids":["22055506"],"is_preprint":false},{"year":2011,"finding":"UPF1 regulates hnRNP E2 (PCBP2) targets in myeloid differentiation. miR-328, induced during monocytic differentiation, acts as an RNA decoy for hnRNP E2, antagonizing its splicing-regulatory function on target pre-mRNAs (including S100A9) in 5'UTR introns, leading to upregulation of CD11b expression and ROS production.","method":"RNAi knockdown of UPF1/hnRNP E2, miR-328 overexpression, differentiation assays, splicing analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple functional assays supporting splicing and decoy mechanism","pmids":["27573788"],"is_preprint":false},{"year":2013,"finding":"PCBP2 is involved in poliovirus IRES-mediated translation initiation; viral proteinase 3CD cleaves PCBP2 in its linker region, which inhibits cap-independent translation but the cleaved form remains active in viral RNA replication. Inhibiting PCBP2 cleavage reduces viral RNA replication efficiency, indicating cleavage mediates a switch from translation to RNA replication.","method":"Proteinase inhibition, viral replication assays, analysis of cleaved vs. intact PCBP2 function","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional dissection of cleavage product activities with direct replication readout, single lab","pmids":["24371074"],"is_preprint":false},{"year":2013,"finding":"PCBP2 and hnRNP A1 bind to both the 5' and 3' ends of murine norovirus (MNV-1) genomic RNA, stabilize 5'-3' RNA-RNA interactions, and induce circularization of the viral RNA. siRNA knockdown of PCBP2 or hnRNP A1 reduces virus yield, establishing a role for PCBP2 in RNA circularization required for efficient viral replication.","method":"RNA co-precipitation with antibodies, recombinant protein binding assays, electron microscopy of RNA circularization, siRNA knockdown with viral titer readout","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (co-precipitation, EM, siRNA), single lab","pmids":["23946460"],"is_preprint":false},{"year":2013,"finding":"PCBP2 promotes glioma cell growth by binding FHL3 mRNA and destabilizing it, thereby suppressing FHL3 protein expression. Knockdown of PCBP2 stabilizes FHL3 mRNA and increases FHL3 protein, inducing apoptosis; FHL3 overexpression phenocopies PCBP2 knockdown.","method":"RIP-ChIP protein-RNA interaction arrays, mRNA stability assay, knockdown/overexpression, in vitro and in vivo growth assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA binding shown by RIP, functional epistasis via FHL3 rescue, single lab","pmids":["23585479"],"is_preprint":false},{"year":2014,"finding":"PCBP1 and PCBP2 deliver iron to deoxyhypusine hydroxylase (DOHH), a dinuclear iron enzyme required for hypusine modification of eIF5A. Cells depleted of PCBP1 or PCBP2 lose DOHH activity; lysates containing PCBP1/2 convert apo-DOHH to holo-DOHH in vitro with greater efficiency than depleted lysates. PCBP1 physically binds DOHH in iron-treated cells. PCBP depletion also reduced cytosolic aconitase activity without full [4Fe-4S] cluster disassembly.","method":"siRNA depletion, in vitro metallation reconstitution with cell lysates, co-immunoprecipitation of PCBP1 with DOHH, enzyme activity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of metallation, co-IP, multiple enzyme activity readouts, two paralogs tested in parallel","pmids":["24843120"],"is_preprint":false},{"year":2015,"finding":"PCBP2 (but not PCBP1, PCBP3, or PCBP4) specifically binds ferroportin 1 (FPN1) in an iron-dependent manner, interacting with the C-terminal cytoplasmic region of FPN1. Iron-loaded but not iron-depleted PCBP2 interacts with FPN1. Silencing PCBP2 suppresses FPN1-dependent iron export from cells.","method":"Yeast and mammalian co-immunoprecipitation, domain mapping of FPN1 binding site, siRNA knockdown with iron export assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal IP in two model systems, domain mapping, functional iron export readout","pmids":["27302059"],"is_preprint":false},{"year":2015,"finding":"PCBP2 contains nuclear-cytoplasmic shuttling activity and localizes to cytoplasmic stress granules (SGs) and a subset (~40%) of P-bodies under normal and stress conditions. Under heat or arsenic stress, PCBP2 accumulates predominantly at SGs but remains in Dcp1a-positive P-bodies. FRAP demonstrates PCBP2 dynamically moves in and out of SGs and P-bodies.","method":"Immunofluorescence, live-cell imaging, FRAP, subcellular fractionation","journal":"RNA (New York, N.Y.) / Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live imaging and FRAP establishing dynamic localization, two separate publications confirming P-body association","pmids":["18174314","19230839"],"is_preprint":false},{"year":2015,"finding":"IRTKS recruits the E2 SUMO ligase Ubc9 to sumoylate PCBP2 in the nucleus. Sumoylation causes PCBP2 cytoplasmic translocation during viral infection, where sumoylated PCBP2 associates with MAVS to initiate its K48-linked polyubiquitination and proteasomal degradation, attenuating antiviral signaling.","method":"Co-immunoprecipitation, sumoylation assays, subcellular fractionation, MAVS degradation assays with proteasome inhibitors, IRTKS knockdown","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods demonstrating sumoylation, translocation, and MAVS degradation mechanism in one study","pmids":["26348439"],"is_preprint":false},{"year":2015,"finding":"Pcbp2-null mouse embryos develop normally until midgestation (E12.5–13.5) but then undergo lethality associated with combined cardiovascular and hematopoietic abnormalities, demonstrating a non-redundant in vivo role for PCBP2 in hematopoiesis. Pcbp1 and Pcbp2 are individually essential for mouse embryonic development with distinct lethal stages.","method":"Targeted knockout mouse model, histological and hematopoietic analysis of embryos","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined developmental phenotype and hematopoietic defect","pmids":["26527618"],"is_preprint":false},{"year":2015,"finding":"PCBP2 promotes stabilization of STAT1 and STAT2 mRNAs by binding C-rich elements in their 3'UTRs. This stabilization increases STAT1/STAT2 protein expression and phosphorylation, enhancing IFN-α antiviral activity against HCV.","method":"RIP-qRT-PCR, RNA half-life assays, RNA pull-down with biotinylated 3'UTR, overexpression and knockdown in HCV replicon cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and pull-down confirm direct binding, mRNA stability and functional antiviral readouts, single lab","pmids":["22022391"],"is_preprint":false},{"year":2015,"finding":"STAT3 transcriptionally activates PCBP2 in EBV-positive B cells; high PCBP2 expression renders individual cells refractory to EBV lytic cycle activation. Suppression of PCBP2 levels is sufficient to increase the number of EBV lytic cells, placing PCBP2 downstream of STAT3 as a mediator of EBV latency maintenance.","method":"ChIP-seq analysis of STAT3 binding at PCBP2 locus, siRNA knockdown of PCBP2, separation of lytic vs. refractory cells, transcriptome analysis","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus functional knockdown, but single lab","pmids":["25717101"],"is_preprint":false},{"year":2015,"finding":"PCBP2 inhibits cardiac hypertrophy by promoting degradation of GPR56 mRNA in cardiomyocytes. PCBP2 knockdown enhances Ang II-induced hypertrophy; PCBP2 overexpression reverses it. GPR56 knockdown partially blocks PCBP2-dependent hypertrophic effects.","method":"Knockdown and overexpression in neonatal cardiomyocytes/H9C2 cells, mRNA stability assays, cell size and protein synthesis readouts","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA destabilization shown, functional epistasis via GPR56 rescue, single lab","pmids":["26116532"],"is_preprint":false},{"year":2016,"finding":"PCBP2 binds the 3'UTR of ARHGDIA mRNA and induces a local RNA structural change that favors subsequent binding of miR-151-5p and miR-16, suppressing ARHGDIA expression and promoting glioma cell migration and invasion.","method":"RIP, RNA structure probing, miRNA target assays, in vitro and in vivo migration/invasion assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct PCBP2-mRNA binding shown by RIP, mechanistic model supported but structural probing limited in detail","pmids":["26761212"],"is_preprint":false},{"year":2016,"finding":"PCBP2 binds the 3'UTR of CDK2 mRNA and stabilizes it, positively regulating CDK2 protein expression. CDK2 mediates PCBP2's pro-viability effect in gastric cancer cells.","method":"Ribonucleoprotein immunoprecipitation (RIP), biotin pulldown of CDK2 3'UTR, mRNA stability assay, CDK2 knockdown rescue","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'UTR binding confirmed by two methods (RIP and biotin pulldown), functional epistasis via CDK2 rescue","pmids":["29744291"],"is_preprint":false},{"year":2016,"finding":"PCBP2 facilitates IRES-mediated c-myc translation via internal ribosome entry segment (IRES), downstream of β2-adrenergic receptor (β2-AR) signaling. β2-AR stimulation promotes PCBP2-β2-AR interaction, and knockdown of PCBP2 blocks β2-AR-induced c-myc protein increase.","method":"Immunoprecipitation-mass spectrometry (IP-MS), reciprocal co-IP, IRES reporter assay, siRNA knockdown","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus IRES assay, functional knockdown, single lab","pmids":["26803058"],"is_preprint":false},{"year":2016,"finding":"SIRT6 suppresses PCBP2 expression in glioma by deacetylating H3K9ac at the PCBP2 promoter; SIRT6 levels are negatively correlated with PCBP2 and H3K9ac enrichment on the PCBP2 promoter.","method":"ChIP for H3K9ac at PCBP2 promoter, SIRT6 overexpression/knockdown, correlation analysis of SIRT6 and PCBP2 levels, in vitro and in vivo growth assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes epigenetic mechanism, functional rescue, single lab","pmids":["24607900"],"is_preprint":false},{"year":2016,"finding":"PCBP2 regulates p73 (TAp73) expression by binding CU-rich elements in the p73 3'UTR and stabilizing p73 mRNA. PCBP2 knockout in MEFs decreases p73 expression and increases ROS production and cellular senescence in a TAp73-dependent manner.","method":"PCBP2 knockout and overexpression, mRNA stability assays, 3'UTR binding assays, ROS measurement, MEF senescence assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mRNA stability and binding established, functional epistasis via p73, primary MEFs used, single lab","pmids":["26907686"],"is_preprint":false},{"year":2017,"finding":"NLRX1 recruits PCBP2 to MAVS, inducing K48-linked polyubiquitination and proteasomal degradation of MAVS during HCV infection, thereby attenuating interferon signaling. The NOD domain of NLRX1 is required for interaction with PCBP2. Mutagenesis confirmed domain requirements for PCBP2-NLRX1 interaction.","method":"Co-immunoprecipitation, mutagenesis of NLRX1 domains, ubiquitination assay, proteasome inhibitor treatment, NLRX1/PCBP2 depletion with IFN signaling readout","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, domain mutagenesis, ubiquitination assay, and functional IFN signaling readout in a single study","pmids":["28956771"],"is_preprint":false},{"year":2017,"finding":"An SRp75/hnRNPG complex interacts with hnRNP E2 (PCBP2), which activates splicing of tau exon 10. SRp75 binds the proximal downstream intron at the FTDP-17 hotspot region; hnRNPG and hnRNP E2 interact with SRp75 as shown by co-immunoprecipitation and co-transfection.","method":"Co-immunoprecipitation, RNAi knockdown, co-transfection splicing reporter assays","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional splicing readout, single lab","pmids":["21723381"],"is_preprint":false},{"year":2018,"finding":"Pcbp2 enables definitive erythropoiesis by promoting inclusion of exon 6 of the Runx1 transcript. Pcbp2-null embryos show accentuated exclusion of Runx1 exon 6. Embryos homozygous for a Runx1 locus lacking exon 6 phenocopy the loss of definitive erythroid lineage in Pcbp2−/− embryos.","method":"Knockout mouse model, RNA-seq splicing analysis, Runx1 exon 6 conditional deletion (Runx1ΔE6) phenocopy","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via phenocopy, RNA-seq, clean KO models, mechanistic splicing outcome defined","pmids":["29866654"],"is_preprint":false},{"year":2019,"finding":"PCBP2 isoform f interacts with the 5'UTR of eIF4G2 (DAP5) and Cyclin I mRNAs and inhibits their translation. eIF4G2, in turn, participates in cap-dependent translation of PCBP2 mRNA, forming a feedback loop between the translation factor and the RNA-binding protein.","method":"In vitro translation assay, cell-based translation reporter assay, RNA-binding assays, isoform-specific analysis","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and cell-based translation assays, isoform specificity demonstrated, single lab","pmids":["31010886"],"is_preprint":false},{"year":2020,"finding":"PCBP2 binds specifically to RNA carrying two closely spaced 8-oxoguanine (8-oxoG) residues (heavily oxidized RNA) via its conserved RNA-binding domains; mutations in these domains disrupt the interaction. In cells, PCBP2 suppresses apoptosis under oxidative conditions (opposite to PCBP1 which promotes apoptosis), as PCBP2-KO cells show increased caspase-3 activity and PARP1 cleavage under oxidative stress.","method":"Binding assays with 8-oxoG-containing RNA, site-directed mutagenesis of RNA-binding domains, PCBP2 knockout cell lines, caspase-3 activity and PARP cleavage assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis confirming RNA-binding domain requirement, gene-editing KO with defined apoptotic phenotype","pmids":["32647012"],"is_preprint":false},{"year":2020,"finding":"PCBP2 and DHX30 bind a CG-rich 3'UTR motif (CGPD-motif) and form a complex that represses translation of mRNAs carrying this motif in cells undergoing p53-dependent cell cycle arrest. Upon DHX30 depletion, CGPD-motif mRNA translation increases and the p53 response shifts toward apoptosis.","method":"Polysome profiling, UV-crosslinking/RIP to identify CGPD-motif interactors, DHX30 depletion/overexpression, translation and apoptosis assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome profiling plus direct interactor identification, functional shift to apoptosis on DHX30 depletion, single lab","pmids":["32234473"],"is_preprint":false},{"year":2020,"finding":"PCBP2 binds C-rich elements in the 3'UTR of sortilin mRNA and stabilizes it. Knockdown of PCBP2 decreases sortilin transcripts. Zn2+ reversibly inhibits the nucleotide-binding ability of PCBP2 in vitro, suggesting a Zn2+-sensitive mRNA stabilization mechanism.","method":"PCBP2 knockdown, mRNA stability assay, in vitro Zn2+ inhibition of RNA binding","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'UTR binding and mRNA stability, Zn2+ inhibition in vitro, single lab","pmids":["31961070"],"is_preprint":false},{"year":2020,"finding":"PCBP2 stabilizes type I collagen α1(I) mRNA by binding its 3' end, increasing mRNA half-life. Alcohol upregulates PCBP2 in hepatic stellate cells, leading to increased collagen mRNA stability; siRNA knockdown of PCBP2 increases the decay rate of collagen α1(I) mRNA.","method":"PCBP2 siRNA, in vitro mRNA decay assay, Western blot for PCBP2 and collagen","journal":"Pharmaceutical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA decay assay demonstrating stabilization, functional knockdown, single lab","pmids":["21643860"],"is_preprint":false},{"year":2020,"finding":"PCBP2 directly binds the 3'UTR of RRM1 mRNA and cooperates with LINC02535 lncRNA to stabilize RRM1 mRNA. PCBP2 and LINC02535 co-localize in the cytoplasm, and together they promote DNA damage repair in cervical cancer cells.","method":"Co-IP, RIP, mRNA stability assay, co-localization by immunofluorescence, knockdown of PCBP2/LINC02535","journal":"Journal of cellular physiology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — co-IP and RIP show interaction, functional readout established, but mechanistic detail is limited","pmids":["32324262"],"is_preprint":false},{"year":2020,"finding":"PCBP2 structure: cryo-EM reconstruction of full-length PCBP2 in complex with the apical region of poliovirus IRES stem-loop IV (SLIVm) resolved to 6.1 Å. PCBP2 interacts with the cruciform RNA via KH domains, featuring a prominent GNRA tetraloop. Cleavage of PCBP2 in its linker region by poliovirus 3CD proteinase makes the complex more flexible and reduces PCBP2 affinity for SLIVm, as shown by SEC-SAXS, SHAPE, hydroxyl-radical cleavage, and limited proteolysis/REMSA.","method":"CryoEM structure determination, SEC-SAXS, SHAPE analysis, hydroxyl-radical cleavage, REMSA, limited proteolysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus multiple orthogonal biochemical validations in a single study","pmids":["32556302"],"is_preprint":false},{"year":2022,"finding":"PCBP2 directly interacts with cGAS and negatively regulates its enzymatic activity by antagonizing cGAS condensation (phase separation), reducing cGAMP production and thereby dampening cGAS-STING antiviral signaling. PCBP2 overexpression reduces antiviral signaling; PCBP2 loss increases cGAS activity.","method":"Co-immunoprecipitation, cGAMP production assay, cGAS condensation assay, PCBP2 overexpression/depletion with STING signaling readout","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct interaction confirmed by co-IP, cGAMP assay, condensation assay, multiple functional readouts, published in high-impact journal","pmids":["35322803"],"is_preprint":false},{"year":2021,"finding":"PCBP1 and PCBP2 are together required for erythroid differentiation; combined conditional inactivation causes midgestational repression of erythroid/hematopoietic gene expression, loss of blood formation, and fetal demise. They mediate overlapping and isoform-specific impacts on hematopoietic lineage transcriptome including mRNA representation and exon splicing.","method":"Conditional double knockout mouse model, RNA-seq transcriptome and splicing analysis, ex vivo primary erythroid progenitor cultures","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double KO with defined erythroid phenotype, RNA-seq mechanistic analysis","pmids":["34180713"],"is_preprint":false},{"year":2021,"finding":"PCBP2 knockdown in malignant mesothelioma cells significantly decreases TfR1 and FTH expression and inhibits proliferation, indicating stagnation of intracellular iron transport. PCBP2 knockdown increases sensitivity to erastin-induced ferroptosis by increasing catalytic Fe(II) levels.","method":"siRNA knockdown, Western blot for TfR1/FTH, Fe(II) measurement, erastin-induced ferroptosis assay","journal":"Pathology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional iron transport and ferroptosis readouts, single lab","pmids":["35089637"],"is_preprint":false},{"year":2021,"finding":"PCBP2 knockdown in pancreatic stellate cells and fibroblasts reverses accumulation of type I collagen in the extracellular matrix, normalizing desmoplastic stroma and enhancing drug penetration into PDAC tumors.","method":"siRNA knockdown, in vitro collagen quantification, spheroid drug penetration assay, orthotopic mouse model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with defined collagen mRNA stability readout, functional in vivo model, single lab","pmids":["33500719"],"is_preprint":false},{"year":2021,"finding":"PCBP2 knockdown in extravillous trophoblasts (EVTs) impairs differentiation toward an invasive phenotype and causes transcript switching (alternative splicing) in genes controlling cellular assembly, proliferation, and cell cycle, with minimal effect on mRNA expression levels.","method":"siRNA knockdown, RNA-seq splicing analysis, Transwell invasion assay, placental explant culture","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq splicing analysis with functional invasion assay, ex vivo placental explants, single lab","pmids":["34095140"],"is_preprint":false},{"year":2022,"finding":"Pcbp2 is essential for CD4+ T cell (Tconv) proliferation via regulation of co-stimulatory signaling. Pcbp2 deficiency in the CD4+ lineage does not affect Treg function but impairs Tconv proliferation and in vivo activation. Pcbp2 controls Runx1 exon 6 splicing in CD4+ T cells, connecting this splicing function to peripheral lymphocyte pool maintenance.","method":"Conditional Pcbp2 knockout in CD4+ T cells, proliferation assay, adoptive transfer colitis model, splicing analysis of Runx1 exon 6","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined proliferative and splicing readouts, single lab","pmids":["36632062"],"is_preprint":false},{"year":2024,"finding":"PCBP2 is required for pancreatic β cell function and adaptation to glucose. PCBP2 is induced by elevated glucose in primary mouse islets; Pcbp2-deficient β cells exhibit defects in calcium flux, insulin granule ultrastructure and exocytosis, and the amplification pathway of insulin secretion. PCBP2 impacts basal and glucose-regulated mRNAs encoding core components of the insulin secretory pathway.","method":"β cell-specific Pcbp2 knockout, transcriptomic analysis, calcium flux assay, electron microscopy of insulin granules, insulin secretion assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type specific KO with multiple orthogonal functional readouts (calcium, EM, secretion), primary human islets also studied","pmids":["38950317"],"is_preprint":false},{"year":2024,"finding":"PCBP1 and PCBP2 are required together for sustaining global mRNA translation in pancreatic β cells by stabilizing mRNAs encoding core translation initiation factors and ribosomal proteins through direct binding. Combined Pcbp1/2 deletion causes severe diabetes due to compromised β cell viability.","method":"β cell-specific Pcbp1 and combined Pcbp1/2 knockout, scRNA-seq, RIP for mRNA-protein interactions, mRNA stability assays, puromycin labeling for global translation monitoring","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional double KO, RIP, mRNA stability, global translation monitoring, multiple orthogonal methods","pmids":["40451383"],"is_preprint":false},{"year":2024,"finding":"PCBP2 stabilizes the mRNA of system Xc- components (SLC3A2/SLC7A11) and limits HIF1α/p300-HMGB1 signaling. In hepatic ischemia-reperfusion injury (HIRI), decreased PCBP2 compromises system Xc- stability, promotes ferroptosis, and enables HIF1α-driven HMGB1 secretion that worsens macrophage recruitment.","method":"PCBP2 knockdown in hepatocytes, mRNA stability assay for Slc3a2/Slc7a11, binding assay, HIRI mouse model with hepatocyte-specific PCBP2 knockdown","journal":"Acta pharmaceutica Sinica. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA stability and binding assay, in vivo hepatocyte-specific KD model, single lab","pmids":["40486855"],"is_preprint":false},{"year":2024,"finding":"Duck PCBP2 promotes DHAV-1 (picornavirus) replication via KH1 domain (aa 1–92) interaction with the viral RNA-dependent RNA polymerase 3Dpol, and facilitates IRES-mediated translation through interaction with stem-loop domains II and III of the DHAV-1 IRES.","method":"Biotinylated RNA pull-down, co-IP with 3Dpol, domain-specific interaction mapping, viral replication/translation assays","journal":"Veterinary research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct pull-down and co-IP with domain mapping, functional replication readout; avian ortholog but consistent with established PCBP2 picornavirus mechanism","pmids":["39300570"],"is_preprint":false},{"year":2025,"finding":"PCBP2 acts as a direct interactor of an intracellular retention motif on miRNAs, binding miRNAs containing this motif (demonstrated by CLIP, RNA pull-down, and proteomics). PCBP2 requires SYNCRIP (an EV miRNA loader) for binding, as shown by SYNCRIP knockdown abolishing PCBP2-miRNA interaction. PCBP2 and SYNCRIP can co-bind miRNAs simultaneously (EMSA). PCBP2 acts as a dominant inhibitor of SYNCRIP-dependent miRNA loading into extracellular vesicles.","method":"CLIP coupled to RNA pull-down and proteomics, mutagenesis of retention motif, SYNCRIP knockdown, EMSA, PCBP2 knockdown with EV miRNA quantification","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (CLIP, pull-down, proteomics, EMSA, mutagenesis), functional EV loading readout","pmids":["40601477"],"is_preprint":false},{"year":2025,"finding":"PCBP2 directly interacts with PARP1 mRNA, inhibiting m6A methylation at PARP1 mRNA and stabilizing it, leading to increased PARP1 expression and enhanced DNA repair activity that contributes to olaparib resistance in BRCA-mutated breast cancer.","method":"Co-IP of PCBP2 with PARP1 mRNA, m6A methylation assay, mRNA stability assay, knockdown/overexpression functional resistance assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA binding and m6A inhibition demonstrated, functional resistance readout, single lab","pmids":["40773674"],"is_preprint":false},{"year":2025,"finding":"PCBP2 forms biomolecular condensates via phase separation in Alzheimer's disease brain. These condensates sequester mitochondrial and mRNA-binding proteins, impairing mitochondrial function and BACE1 mRNA stability. The small molecule CN-0928 binds INTS1, reduces PCBP2 protein level, inhibits condensate formation, and mitigates AD pathology.","method":"Phase separation assays, proteomics of condensate contents, PCBP2 level modulation, AD mouse models, CN-0928 target identification (INTS1 binding), cognitive readouts","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — condensate formation and protein sequestration demonstrated, pharmacologic target identified, in vivo efficacy shown, single lab","pmids":["41298370"],"is_preprint":false},{"year":2025,"finding":"PCBP2 is identified as an i-motif DNA-interacting protein. By destabilizing the i-motif structure, PCBP2 simultaneously reduces the mechanical stability of the facing G-quadruplex (by ~13.7 kcal/mol), enabling a replisome to bypass these DNA structural barriers during genome replication.","method":"Single-molecule force spectroscopy, PCBP2 identification as i-motif binding protein, quantitative mechanical stability measurements","journal":"Angewandte Chemie (International ed. in English)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — single-molecule reconstitution with quantitative measurements, but single study and novel/unexpected activity","pmids":["41327866"],"is_preprint":false},{"year":2025,"finding":"A lncRNA BASP1-AS1 assembles a complex with ULK1 and LDHA, activating LDHA to increase lactate, which triggers PCBP2 K115 lactylation. This modification disrupts PCBP2-ARIH2 interaction, inhibiting ubiquitin-dependent degradation and stabilizing PCBP2 protein, which then suppresses ferroptosis and confers oxaliplatin resistance in gastric cancer.","method":"Multi-omics profiling, co-IP, ubiquitination assay, protein stability assay, LDHA activity assay, K115 lactylation site identification, organoid models","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific lactylation site identified, ARIH2 interaction mapped, ubiquitination and stability assays, single lab","pmids":["40914325"],"is_preprint":false},{"year":2025,"finding":"PCBP2 promotes MAVS K48-linked polyubiquitination and proteasomal degradation during Dabie bandavirus (DBV/SFTS virus) infection, suppressing the MAVS-TBK1-IRF3 axis and type I interferon responses. PCBP2 overexpression enhances DBV replication; knockdown reduces it.","method":"Co-IP of PCBP2 with MAVS, ubiquitination assay, proteasome inhibitor treatment, PCBP2 overexpression/knockdown with IFN signaling and viral replication readouts","journal":"Virus research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct PCBP2-MAVS interaction and ubiquitination assay confirmed, functional antiviral readout, single lab","pmids":["41638535"],"is_preprint":false},{"year":2016,"finding":"PCBP2 was identified as the direct binding target of the immunosuppressive agent 15-deoxyspergualin (DSG) by pull-down assay. DSG treatment shifts PCBP2 intracellular localization from nucleus to cytoplasm. Overexpression of PCBP2 reduces the anti-proliferative activity of DSG.","method":"Biotinylated DSG probe pull-down, DSG binding confirmation, subcellular fractionation after DSG treatment, PCBP2 overexpression rescue assay","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pull-down identifies DSG binding to PCBP2 and localization change shown, but mechanism is limited and single lab","pmids":["27261432"],"is_preprint":false},{"year":2025,"finding":"PCBP2 promotes EGFR-driven tumor angiogenesis by binding miRNAs containing a 'GGGU' motif and promoting their loading into small extracellular vesicles (sEVs). EGFR overexpression transcriptionally upregulates PCBP2 protein, strengthening its binding to these miRNAs and their secretion via sEVs. PCBP2 depletion impairs EGFR-driven angiogenesis.","method":"miRNA pull-down assays, small RNA sequencing, PCBP2 depletion with sEV miRNA quantification, EGFR overexpression, co-culture and murine tumor models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pull-down and sequencing identify motif-based mechanism, functional angiogenesis readout in vivo, single lab","pmids":["39816681"],"is_preprint":false}],"current_model":"PCBP2 is a multifunctional KH-domain RNA-binding protein that operates as: (1) a translational repressor binding 5'UTR poly(C)/CU-rich sequences of target mRNAs (e.g., CEBPA), a function regulated by ERK1/2-mediated phosphorylation and counteracted by miR-328 acting as an RNA decoy; (2) an mRNA stabilizer binding 3'UTR C-rich elements of numerous mRNAs (STAT1/2, p73, CDK2, collagen α1(I), SLC7A11, and others); (3) a cytosolic iron chaperone that delivers Fe(II) to non-heme iron enzymes including HIF prolyl hydroxylases, DOHH, and aconitase, and mediates iron-dependent interactions with DMT1 and ferroportin for cellular iron import and export; (4) a negative regulator of innate immune signaling through direct interaction with MAVS, promoting its K48-linked polyubiquitination and proteasomal degradation, a process enhanced by NLRX1 recruitment and IRTKS-mediated sumoylation of PCBP2; (5) a splicing regulator promoting Runx1 exon 6 inclusion, thereby governing definitive erythropoiesis and T cell function; (6) a structural IRES co-factor engaging poliovirus and other picornavirus IRESs through its KH domains, cleaved by viral 3CD proteinase to switch templates from translation to RNA replication; (7) a negative regulator of cGAS condensation and enzymatic activity dampening cGAS-STING antiviral signaling; (8) a phase-separating protein whose condensates can sequester mitochondrial and mRNA-binding proteins; and (9) an inhibitor of SYNCRIP-dependent miRNA loading into extracellular vesicles."},"narrative":{"mechanistic_narrative":"PCBP2 (hnRNP E2) is a multifunctional KH-domain poly(C)-binding protein that governs gene expression post-transcriptionally through sequence-specific binding to C-rich/CU-rich elements in target mRNAs, with additional roles as a cytosolic iron chaperone, splicing regulator, and modulator of innate immune signaling [PMID:11753385, PMID:22055506, PMID:29866654]. As a translational regulator, it binds the 5'UTR of CEBPA to block C/EBPα synthesis in BCR-ABL+ myeloid cells, a repression that requires ERK1/2-mediated phosphorylation at defined serine/threonine residues to stabilize PCBP2 and is relieved by miR-328 acting as a seed-independent RNA decoy that competes for binding [PMID:11753385, PMID:17475908, PMID:20211135]. Conversely, PCBP2 binds C-rich elements in numerous 3'UTRs to stabilize their mRNAs—including STAT1/STAT2, p73, CDK2, collagen α1(I), and system Xc- components SLC3A2/SLC7A11—thereby tuning antiviral, senescence, proliferative, fibrotic, and ferroptosis programs [PMID:22022391, PMID:26907686, PMID:29744291, PMID:21643860, PMID:40486855]. Independent of RNA binding, PCBP2 functions as an iron chaperone delivering Fe(II) to non-heme iron enzymes such as the HIF prolyl hydroxylases, asparaginyl hydroxylase FIH1, deoxyhypusine hydroxylase, and aconitase, and it binds ferroportin in an iron-dependent manner to support cellular iron handling [PMID:22055506, PMID:24843120, PMID:27302059]. In innate immunity, sumoylated PCBP2 is recruited to MAVS—enhanced by NLRX1—to drive MAVS K48-linked polyubiquitination and proteasomal degradation, dampening interferon responses, and it separately interacts with cGAS to antagonize its condensation and enzymatic activity [PMID:26348439, PMID:28956771, PMID:35322803, PMID:41638535]. PCBP2 also acts as a splicing regulator: it promotes Runx1 exon 6 inclusion required for definitive erythropoiesis and CD4+ T cell proliferation, and Pcbp2-null embryos die at midgestation with cardiovascular and hematopoietic defects [PMID:29866654, PMID:36632062, PMID:26527618]. It is a structural co-factor for picornavirus IRES function, engaging poliovirus stem-loop IV via its KH domains in a complex remodeled by 3CD proteinase cleavage that switches the viral template from translation to replication [PMID:24371074, PMID:32556302]. PCBP2 binds heavily oxidized (8-oxoG) RNA, forms phase-separating condensates, and inhibits SYNCRIP-dependent miRNA loading into extracellular vesicles, defining additional roles in stress responses, condensate biology, and intercellular RNA trafficking [PMID:32647012, PMID:41298370, PMID:40601477].","teleology":[{"year":2001,"claim":"Established that PCBP2/hnRNP E2 is a translational repressor controlling myeloid differentiation by binding the CEBPA 5'UTR, linking it to BCR-ABL leukemogenesis.","evidence":"Ectopic expression and CEBPA protein vs. mRNA readouts in myeloid precursors","pmids":["11753385"],"confidence":"High","gaps":["Did not define the precise 5'UTR binding element","Mechanism of translational block (initiation step) not resolved"]},{"year":2007,"claim":"Resolved how oncogenic signaling activates PCBP2 by showing ERK1/2 phosphorylation at specific Ser/Thr sites stabilizes the protein and is required for CEBPA repression.","evidence":"Site-directed S/T→A mutagenesis, MAPK inhibition, differentiation rescue","pmids":["17475908"],"confidence":"High","gaps":["How phosphorylation alters RNA-binding affinity structurally not shown","Phosphatase counter-regulation unaddressed"]},{"year":2010,"claim":"Defined a decoy mechanism whereby miR-328 binds PCBP2 seed-independently to derepress CEBPA, establishing a non-canonical RNA-protein regulatory axis.","evidence":"RNA-protein interaction and differentiation rescue assays in CML-BC blasts","pmids":["20211135"],"confidence":"High","gaps":["Stoichiometry/affinity of miR-328 vs. mRNA competition not quantified","Whether other miRNAs use similar decoy logic unknown"]},{"year":2011,"claim":"Revealed a distinct biochemical activity—iron chaperoning—by showing PCBP1/2 deliver Fe(II) to HIF prolyl hydroxylases and FIH1, coupling PCBP2 to oxygen sensing.","evidence":"RNAi depletion, in vitro reconstitution with purified Fe-PCBP1, co-IP, hydroxylation assays","pmids":["22055506"],"confidence":"High","gaps":["Direct PCBP2-PHD physical binding (vs. PCBP1) less defined","How a KH-domain protein coordinates iron structurally unresolved"]},{"year":2014,"claim":"Extended the iron-chaperone role to DOHH and aconitase, showing PCBP2 metallates multiple non-heme iron enzymes regulating hypusination and metabolism.","evidence":"siRNA depletion, in vitro metallation with lysates, co-IP, enzyme activity assays","pmids":["24843120"],"confidence":"High","gaps":["Selectivity rules for which iron enzymes PCBP2 serves not established","Handoff mechanism to dinuclear sites unknown"]},{"year":2015,"claim":"Connected PCBP2 to iron efflux by demonstrating iron-dependent, paralog-specific binding to ferroportin required for cellular iron export.","evidence":"Reciprocal co-IP in yeast and mammalian systems, FPN1 domain mapping, iron export assay","pmids":["27302059"],"confidence":"High","gaps":["Structural basis of iron-dependent FPN1 recognition not shown","Directionality of iron transfer at the membrane unresolved"]},{"year":2015,"claim":"Identified PCBP2 as a negative regulator of innate immunity, with IRTKS-driven sumoylation triggering cytoplasmic relocation and MAVS degradation.","evidence":"Sumoylation assays, fractionation, MAVS ubiquitination/degradation with proteasome inhibitors","pmids":["26348439"],"confidence":"High","gaps":["Identity of the E3 ligase ubiquitinating MAVS in this pathway not defined","Which SUMO acceptor lysines on PCBP2 unmapped"]},{"year":2015,"claim":"Demonstrated a non-redundant in vivo requirement for PCBP2 in development, with knockout embryos dying at midgestation from cardiovascular and hematopoietic defects.","evidence":"Targeted knockout mouse, histological and hematopoietic analysis","pmids":["26527618"],"confidence":"High","gaps":["Molecular target mediating the embryonic phenotype not pinpointed in this study","Tissue-of-origin of lethality unresolved"]},{"year":2015,"claim":"Established PCBP2 as a 3'UTR-binding mRNA stabilizer in antiviral defense by stabilizing STAT1/STAT2 transcripts to enhance IFN-α activity.","evidence":"RIP-qPCR, half-life assays, biotinylated 3'UTR pull-down in HCV replicon cells","pmids":["22022391"],"confidence":"Medium","gaps":["How stabilization mechanistically opposes its MAVS-degrading role not reconciled","Single lab"]},{"year":2016,"claim":"Broadened the 3'UTR-stabilization principle across cell-fate and disease contexts (p73, CDK2, ARHGDIA, GPR56, collagen), showing PCBP2 can also prime miRNA access via local RNA structural change.","evidence":"RIP, mRNA stability and structure-probing assays, functional epistasis in glioma/gastric/cardiac models","pmids":["26907686","29744291","26761212","26116532"],"confidence":"Medium","gaps":["Rules determining stabilization vs. destabilization of a bound mRNA unresolved","Individual targets validated in single labs"]},{"year":2018,"claim":"Defined a developmentally critical splicing function: PCBP2 promotes Runx1 exon 6 inclusion required for definitive erythropoiesis, validated by phenocopy.","evidence":"Knockout mouse, RNA-seq splicing, Runx1ΔE6 genetic phenocopy","pmids":["29866654"],"confidence":"High","gaps":["Cis-elements bound on Runx1 pre-mRNA not mapped","Spliceosomal partners mediating inclusion unknown"]},{"year":2020,"claim":"Revealed PCBP2 senses oxidized RNA (8-oxoG) via its RNA-binding domains and suppresses apoptosis under oxidative stress, opposite to PCBP1.","evidence":"8-oxoG RNA binding assays, RBD mutagenesis, PCBP2-KO cells with caspase/PARP readouts","pmids":["32647012"],"confidence":"High","gaps":["Downstream effectors of the anti-apoptotic effect not identified","Fate of oxidized RNA bound by PCBP2 unknown"]},{"year":2020,"claim":"Resolved the structural basis of PCBP2's IRES co-factor activity and how viral 3CD cleavage remodels the complex to switch translation to replication.","evidence":"6.1 Å cryo-EM of PCBP2-poliovirus SLIVm plus SEC-SAXS, SHAPE, REMSA, limited proteolysis","pmids":["32556302","24371074"],"confidence":"High","gaps":["Atomic-resolution contacts not achieved at 6.1 Å","Generalizability to other picornaviral IRESs only partially tested"]},{"year":2021,"claim":"Showed PCBP1 and PCBP2 act together to sustain the erythroid/hematopoietic transcriptome and splicing program, with combined loss causing fetal demise.","evidence":"Conditional double knockout mouse, RNA-seq, ex vivo erythroid progenitor cultures","pmids":["34180713"],"confidence":"High","gaps":["Paralog-specific vs. shared targets only partially separated","Direct binding maps not generated"]},{"year":2022,"claim":"Identified a second innate-immune brake: PCBP2 binds cGAS and antagonizes its phase separation to limit cGAMP production and STING signaling.","evidence":"Co-IP, cGAMP and cGAS condensation assays, gain/loss with STING readout","pmids":["35322803"],"confidence":"High","gaps":["Whether RNA binding is required for cGAS regulation unclear","Structural basis of condensation antagonism unknown"]},{"year":2024,"claim":"Established PCBP2 (with PCBP1) as essential for β cell function and global translation by stabilizing mRNAs of the insulin secretory pathway and translation machinery.","evidence":"β cell-specific single and double knockouts, RIP, mRNA stability, puromycin labeling, calcium/EM/secretion assays","pmids":["38950317","40451383"],"confidence":"High","gaps":["Direct binding sites on translation-factor mRNAs not fully enumerated","Relative contributions of stabilization vs. splicing in β cells unresolved"]},{"year":2025,"claim":"Defined PCBP2 as a regulator of intercellular RNA trafficking, acting as a dominant inhibitor or promoter of miRNA loading into extracellular vesicles depending on motif and context.","evidence":"CLIP, RNA pull-down, proteomics, EMSA, SYNCRIP knockdown and EV miRNA quantification; EGFR-driven angiogenesis models","pmids":["40601477","39816681"],"confidence":"High","gaps":["Apparent opposing effects on EV miRNA loading across contexts not mechanistically reconciled","Determinants switching inhibitory vs. promoting roles unknown"]},{"year":2025,"claim":"Implicated PCBP2 condensation and DNA-structure binding in disease and replication, linking phase separation to Alzheimer's pathology and i-motif/G-quadruplex resolution during genome replication.","evidence":"Phase separation/proteomics with AD models and CN-0928; single-molecule force spectroscopy on i-motif DNA","pmids":["41298370","41327866"],"confidence":"Medium","gaps":["DNA-binding activity is a single-study novel finding awaiting independent confirmation","Physiological trigger of pathological condensation unclear"]},{"year":null,"claim":"It remains unresolved how PCBP2 integrates its disparate activities—mRNA stabilization vs. degradation, iron chaperoning, splicing, innate-immune suppression, and condensate formation—and what determines target and activity selection in a given cell.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking RNA-binding to iron-chaperone functions","Determinants of stabilization vs. destabilization of bound mRNAs unknown","Switching logic between immune-promoting and immune-suppressing outcomes undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,13,20,17,25,41]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[3,8,9]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,24,26]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[44]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,31]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10,11,29]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[10,11,47]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,13,20,41]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,21,31,46]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,8,9,33]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[23,32,36]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[38]}],"complexes":[],"partners":["MAVS","NLRX1","CGAS","SYNCRIP","DHX30","FPN1","SRP75","PARP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15366","full_name":"Poly(rC)-binding protein 2","aliases":["Alpha-CP2","Heterogeneous nuclear ribonucleoprotein E2","hnRNP E2"],"length_aa":365,"mass_kda":38.6,"function":"Single-stranded nucleic acid binding protein that binds preferentially to oligo dC (PubMed:12414943, PubMed:7607214). Major cellular poly(rC)-binding protein (PubMed:12414943). Also binds poly(rU) (PubMed:12414943). Acts as a negative regulator of antiviral signaling (PubMed:19881509, PubMed:35322803). Negatively regulates cellular antiviral responses mediated by MAVS signaling (PubMed:19881509). It acts as an adapter between MAVS and the E3 ubiquitin ligase ITCH, therefore triggering MAVS ubiquitination and degradation (PubMed:19881509). Negativeley regulates the cGAS-STING pathway via interaction with CGAS, preventing the formation of liquid-like droplets in which CGAS is activated (PubMed:35322803). Together with PCBP1, required for erythropoiesis, possibly by regulating mRNA splicing (By similarity) (Microbial infection) In case of infection by poliovirus, binds to the viral internal ribosome entry site (IRES) and stimulates the IRES-mediated translation (PubMed:12414943, PubMed:24371074). Also plays a role in initiation of viral RNA replication in concert with the viral protein 3CD (PubMed:12414943)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q15366/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PCBP2","classification":"Common Essential","n_dependent_lines":1200,"n_total_lines":1208,"dependency_fraction":0.9933774834437086},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RBM39","stoichiometry":10.0},{"gene":"COMMD2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PCBP2","total_profiled":1310},"omim":[{"mim_id":"620770","title":"MITOREGULIN; MTLN","url":"https://www.omim.org/entry/620770"},{"mim_id":"613701","title":"MICRO RNA 328; MIR328","url":"https://www.omim.org/entry/613701"},{"mim_id":"608503","title":"POLY(rC)-BINDING PROTEIN 4; PCBP4","url":"https://www.omim.org/entry/608503"},{"mim_id":"608502","title":"POLY(rC)-BINDING PROTEIN 3; PCBP3","url":"https://www.omim.org/entry/608502"},{"mim_id":"601210","title":"POLY(rC)-BINDING PROTEIN 2; PCBP2","url":"https://www.omim.org/entry/601210"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PCBP2"},"hgnc":{"alias_symbol":["HNRPE2","hnRNP-E2","HNRNPE2"],"prev_symbol":[]},"alphafold":{"accession":"Q15366","domains":[{"cath_id":"3.30.310.210","chopping":"12-86_97-171","consensus_level":"medium","plddt":81.995,"start":12,"end":171},{"cath_id":"3.30.1370.10","chopping":"287-359","consensus_level":"high","plddt":83.1452,"start":287,"end":359}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15366","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15366-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15366-F1-predicted_aligned_error_v6.png","plddt_mean":67.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PCBP2","jax_strain_url":"https://www.jax.org/strain/search?query=PCBP2"},"sequence":{"accession":"Q15366","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15366.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15366/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15366"}},"corpus_meta":[{"pmid":"20211135","id":"PMC_20211135","title":"miR-328 functions as an RNA decoy to modulate hnRNP E2 regulation of mRNA translation in leukemic blasts.","date":"2010","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/20211135","citation_count":412,"is_preprint":false},{"pmid":"11753385","id":"PMC_11753385","title":"BCR-ABL suppresses C/EBPalpha expression through inhibitory action of hnRNP E2.","date":"2001","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11753385","citation_count":261,"is_preprint":false},{"pmid":"22055506","id":"PMC_22055506","title":"Activation of the HIF prolyl hydroxylase by the iron chaperones PCBP1 and PCBP2.","date":"2011","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/22055506","citation_count":176,"is_preprint":false},{"pmid":"27302059","id":"PMC_27302059","title":"Iron Export through the Transporter Ferroportin 1 Is Modulated by the Iron Chaperone PCBP2.","date":"2016","source":"The Journal of biological 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BCR-ABL induces hnRNP E2 expression to mediate this translational block.\",\n      \"method\": \"Ectopic expression of hnRNP E2, Western blot for C/EBPα protein vs. CEBPA mRNA levels, functional differentiation assay\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple papers (PMIDs 11753385, 17475908, 20211135) with consistent mechanistic findings and functional readouts\",\n      \"pmids\": [\"11753385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"BCR/ABL-activated MAPK(ERK1/2) phosphorylates hnRNP E2 (PCBP2) at serines 173, 189, 272 and threonine 213, stabilizing the protein. Phosphorylation is required for hnRNP E2 binding to the 5'UTR of CEBPA mRNA; serine/threonine to alanine substitutions abolish phosphorylation, decrease hnRNP E2 stability, and restore C/EBPα expression and granulocytic differentiation.\",\n      \"method\": \"Site-directed mutagenesis (S→A substitutions), pharmacologic MAPK inhibition, in vitro/in vivo differentiation assays, binding assays to CEBPA 5'UTR\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis identifying specific phosphorylation sites, pharmacologic validation, functional rescue in primary patient cells and mouse models\",\n      \"pmids\": [\"17475908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"miR-328 acts as a decoy by binding directly to hnRNP E2 (PCBP2) in a seed-sequence-independent manner, competing with CEBPA mRNA for hnRNP E2 binding, thereby releasing CEBPA mRNA from hnRNP E2-mediated translational inhibition.\",\n      \"method\": \"RNA-protein interaction assays, rescue differentiation assays, miR-328 restoration in CML-BC blasts\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic dissection of RNA decoy activity replicated functionally in leukemic blasts with multiple readouts\",\n      \"pmids\": [\"20211135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PCBP1 and PCBP2 function as iron chaperones that deliver Fe(II) to the HIF prolyl hydroxylases (PHD1/2/3) and asparaginyl hydroxylase FIH1. Depletion of PCBP1 or PCBP2 reduces PHD activity, impairs prolyl hydroxylation of HIF1α, and causes HIF1α accumulation; PHD activity is restored in vitro by adding purified Fe-PCBP1. PCBP1 physically binds PHD2 and FIH1 in vivo.\",\n      \"method\": \"RNAi depletion, in vitro activity reconstitution with purified Fe-PCBP1, co-immunoprecipitation (PCBP1 with PHD2/FIH1), HIF1α hydroxylation and degradation assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified protein, co-IP, loss-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"22055506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"UPF1 regulates hnRNP E2 (PCBP2) targets in myeloid differentiation. miR-328, induced during monocytic differentiation, acts as an RNA decoy for hnRNP E2, antagonizing its splicing-regulatory function on target pre-mRNAs (including S100A9) in 5'UTR introns, leading to upregulation of CD11b expression and ROS production.\",\n      \"method\": \"RNAi knockdown of UPF1/hnRNP E2, miR-328 overexpression, differentiation assays, splicing analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple functional assays supporting splicing and decoy mechanism\",\n      \"pmids\": [\"27573788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCBP2 is involved in poliovirus IRES-mediated translation initiation; viral proteinase 3CD cleaves PCBP2 in its linker region, which inhibits cap-independent translation but the cleaved form remains active in viral RNA replication. Inhibiting PCBP2 cleavage reduces viral RNA replication efficiency, indicating cleavage mediates a switch from translation to RNA replication.\",\n      \"method\": \"Proteinase inhibition, viral replication assays, analysis of cleaved vs. intact PCBP2 function\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional dissection of cleavage product activities with direct replication readout, single lab\",\n      \"pmids\": [\"24371074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCBP2 and hnRNP A1 bind to both the 5' and 3' ends of murine norovirus (MNV-1) genomic RNA, stabilize 5'-3' RNA-RNA interactions, and induce circularization of the viral RNA. siRNA knockdown of PCBP2 or hnRNP A1 reduces virus yield, establishing a role for PCBP2 in RNA circularization required for efficient viral replication.\",\n      \"method\": \"RNA co-precipitation with antibodies, recombinant protein binding assays, electron microscopy of RNA circularization, siRNA knockdown with viral titer readout\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (co-precipitation, EM, siRNA), single lab\",\n      \"pmids\": [\"23946460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCBP2 promotes glioma cell growth by binding FHL3 mRNA and destabilizing it, thereby suppressing FHL3 protein expression. Knockdown of PCBP2 stabilizes FHL3 mRNA and increases FHL3 protein, inducing apoptosis; FHL3 overexpression phenocopies PCBP2 knockdown.\",\n      \"method\": \"RIP-ChIP protein-RNA interaction arrays, mRNA stability assay, knockdown/overexpression, in vitro and in vivo growth assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA binding shown by RIP, functional epistasis via FHL3 rescue, single lab\",\n      \"pmids\": [\"23585479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PCBP1 and PCBP2 deliver iron to deoxyhypusine hydroxylase (DOHH), a dinuclear iron enzyme required for hypusine modification of eIF5A. Cells depleted of PCBP1 or PCBP2 lose DOHH activity; lysates containing PCBP1/2 convert apo-DOHH to holo-DOHH in vitro with greater efficiency than depleted lysates. PCBP1 physically binds DOHH in iron-treated cells. PCBP depletion also reduced cytosolic aconitase activity without full [4Fe-4S] cluster disassembly.\",\n      \"method\": \"siRNA depletion, in vitro metallation reconstitution with cell lysates, co-immunoprecipitation of PCBP1 with DOHH, enzyme activity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of metallation, co-IP, multiple enzyme activity readouts, two paralogs tested in parallel\",\n      \"pmids\": [\"24843120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PCBP2 (but not PCBP1, PCBP3, or PCBP4) specifically binds ferroportin 1 (FPN1) in an iron-dependent manner, interacting with the C-terminal cytoplasmic region of FPN1. Iron-loaded but not iron-depleted PCBP2 interacts with FPN1. Silencing PCBP2 suppresses FPN1-dependent iron export from cells.\",\n      \"method\": \"Yeast and mammalian co-immunoprecipitation, domain mapping of FPN1 binding site, siRNA knockdown with iron export assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal IP in two model systems, domain mapping, functional iron export readout\",\n      \"pmids\": [\"27302059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PCBP2 contains nuclear-cytoplasmic shuttling activity and localizes to cytoplasmic stress granules (SGs) and a subset (~40%) of P-bodies under normal and stress conditions. Under heat or arsenic stress, PCBP2 accumulates predominantly at SGs but remains in Dcp1a-positive P-bodies. FRAP demonstrates PCBP2 dynamically moves in and out of SGs and P-bodies.\",\n      \"method\": \"Immunofluorescence, live-cell imaging, FRAP, subcellular fractionation\",\n      \"journal\": \"RNA (New York, N.Y.) / Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live imaging and FRAP establishing dynamic localization, two separate publications confirming P-body association\",\n      \"pmids\": [\"18174314\", \"19230839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IRTKS recruits the E2 SUMO ligase Ubc9 to sumoylate PCBP2 in the nucleus. Sumoylation causes PCBP2 cytoplasmic translocation during viral infection, where sumoylated PCBP2 associates with MAVS to initiate its K48-linked polyubiquitination and proteasomal degradation, attenuating antiviral signaling.\",\n      \"method\": \"Co-immunoprecipitation, sumoylation assays, subcellular fractionation, MAVS degradation assays with proteasome inhibitors, IRTKS knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods demonstrating sumoylation, translocation, and MAVS degradation mechanism in one study\",\n      \"pmids\": [\"26348439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Pcbp2-null mouse embryos develop normally until midgestation (E12.5–13.5) but then undergo lethality associated with combined cardiovascular and hematopoietic abnormalities, demonstrating a non-redundant in vivo role for PCBP2 in hematopoiesis. Pcbp1 and Pcbp2 are individually essential for mouse embryonic development with distinct lethal stages.\",\n      \"method\": \"Targeted knockout mouse model, histological and hematopoietic analysis of embryos\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined developmental phenotype and hematopoietic defect\",\n      \"pmids\": [\"26527618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PCBP2 promotes stabilization of STAT1 and STAT2 mRNAs by binding C-rich elements in their 3'UTRs. This stabilization increases STAT1/STAT2 protein expression and phosphorylation, enhancing IFN-α antiviral activity against HCV.\",\n      \"method\": \"RIP-qRT-PCR, RNA half-life assays, RNA pull-down with biotinylated 3'UTR, overexpression and knockdown in HCV replicon cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and pull-down confirm direct binding, mRNA stability and functional antiviral readouts, single lab\",\n      \"pmids\": [\"22022391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"STAT3 transcriptionally activates PCBP2 in EBV-positive B cells; high PCBP2 expression renders individual cells refractory to EBV lytic cycle activation. Suppression of PCBP2 levels is sufficient to increase the number of EBV lytic cells, placing PCBP2 downstream of STAT3 as a mediator of EBV latency maintenance.\",\n      \"method\": \"ChIP-seq analysis of STAT3 binding at PCBP2 locus, siRNA knockdown of PCBP2, separation of lytic vs. refractory cells, transcriptome analysis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus functional knockdown, but single lab\",\n      \"pmids\": [\"25717101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PCBP2 inhibits cardiac hypertrophy by promoting degradation of GPR56 mRNA in cardiomyocytes. PCBP2 knockdown enhances Ang II-induced hypertrophy; PCBP2 overexpression reverses it. GPR56 knockdown partially blocks PCBP2-dependent hypertrophic effects.\",\n      \"method\": \"Knockdown and overexpression in neonatal cardiomyocytes/H9C2 cells, mRNA stability assays, cell size and protein synthesis readouts\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA destabilization shown, functional epistasis via GPR56 rescue, single lab\",\n      \"pmids\": [\"26116532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCBP2 binds the 3'UTR of ARHGDIA mRNA and induces a local RNA structural change that favors subsequent binding of miR-151-5p and miR-16, suppressing ARHGDIA expression and promoting glioma cell migration and invasion.\",\n      \"method\": \"RIP, RNA structure probing, miRNA target assays, in vitro and in vivo migration/invasion assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct PCBP2-mRNA binding shown by RIP, mechanistic model supported but structural probing limited in detail\",\n      \"pmids\": [\"26761212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCBP2 binds the 3'UTR of CDK2 mRNA and stabilizes it, positively regulating CDK2 protein expression. CDK2 mediates PCBP2's pro-viability effect in gastric cancer cells.\",\n      \"method\": \"Ribonucleoprotein immunoprecipitation (RIP), biotin pulldown of CDK2 3'UTR, mRNA stability assay, CDK2 knockdown rescue\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'UTR binding confirmed by two methods (RIP and biotin pulldown), functional epistasis via CDK2 rescue\",\n      \"pmids\": [\"29744291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCBP2 facilitates IRES-mediated c-myc translation via internal ribosome entry segment (IRES), downstream of β2-adrenergic receptor (β2-AR) signaling. β2-AR stimulation promotes PCBP2-β2-AR interaction, and knockdown of PCBP2 blocks β2-AR-induced c-myc protein increase.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (IP-MS), reciprocal co-IP, IRES reporter assay, siRNA knockdown\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus IRES assay, functional knockdown, single lab\",\n      \"pmids\": [\"26803058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SIRT6 suppresses PCBP2 expression in glioma by deacetylating H3K9ac at the PCBP2 promoter; SIRT6 levels are negatively correlated with PCBP2 and H3K9ac enrichment on the PCBP2 promoter.\",\n      \"method\": \"ChIP for H3K9ac at PCBP2 promoter, SIRT6 overexpression/knockdown, correlation analysis of SIRT6 and PCBP2 levels, in vitro and in vivo growth assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes epigenetic mechanism, functional rescue, single lab\",\n      \"pmids\": [\"24607900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCBP2 regulates p73 (TAp73) expression by binding CU-rich elements in the p73 3'UTR and stabilizing p73 mRNA. PCBP2 knockout in MEFs decreases p73 expression and increases ROS production and cellular senescence in a TAp73-dependent manner.\",\n      \"method\": \"PCBP2 knockout and overexpression, mRNA stability assays, 3'UTR binding assays, ROS measurement, MEF senescence assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mRNA stability and binding established, functional epistasis via p73, primary MEFs used, single lab\",\n      \"pmids\": [\"26907686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NLRX1 recruits PCBP2 to MAVS, inducing K48-linked polyubiquitination and proteasomal degradation of MAVS during HCV infection, thereby attenuating interferon signaling. The NOD domain of NLRX1 is required for interaction with PCBP2. Mutagenesis confirmed domain requirements for PCBP2-NLRX1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis of NLRX1 domains, ubiquitination assay, proteasome inhibitor treatment, NLRX1/PCBP2 depletion with IFN signaling readout\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, domain mutagenesis, ubiquitination assay, and functional IFN signaling readout in a single study\",\n      \"pmids\": [\"28956771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"An SRp75/hnRNPG complex interacts with hnRNP E2 (PCBP2), which activates splicing of tau exon 10. SRp75 binds the proximal downstream intron at the FTDP-17 hotspot region; hnRNPG and hnRNP E2 interact with SRp75 as shown by co-immunoprecipitation and co-transfection.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, co-transfection splicing reporter assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional splicing readout, single lab\",\n      \"pmids\": [\"21723381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Pcbp2 enables definitive erythropoiesis by promoting inclusion of exon 6 of the Runx1 transcript. Pcbp2-null embryos show accentuated exclusion of Runx1 exon 6. Embryos homozygous for a Runx1 locus lacking exon 6 phenocopy the loss of definitive erythroid lineage in Pcbp2−/− embryos.\",\n      \"method\": \"Knockout mouse model, RNA-seq splicing analysis, Runx1 exon 6 conditional deletion (Runx1ΔE6) phenocopy\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via phenocopy, RNA-seq, clean KO models, mechanistic splicing outcome defined\",\n      \"pmids\": [\"29866654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PCBP2 isoform f interacts with the 5'UTR of eIF4G2 (DAP5) and Cyclin I mRNAs and inhibits their translation. eIF4G2, in turn, participates in cap-dependent translation of PCBP2 mRNA, forming a feedback loop between the translation factor and the RNA-binding protein.\",\n      \"method\": \"In vitro translation assay, cell-based translation reporter assay, RNA-binding assays, isoform-specific analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and cell-based translation assays, isoform specificity demonstrated, single lab\",\n      \"pmids\": [\"31010886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 binds specifically to RNA carrying two closely spaced 8-oxoguanine (8-oxoG) residues (heavily oxidized RNA) via its conserved RNA-binding domains; mutations in these domains disrupt the interaction. In cells, PCBP2 suppresses apoptosis under oxidative conditions (opposite to PCBP1 which promotes apoptosis), as PCBP2-KO cells show increased caspase-3 activity and PARP1 cleavage under oxidative stress.\",\n      \"method\": \"Binding assays with 8-oxoG-containing RNA, site-directed mutagenesis of RNA-binding domains, PCBP2 knockout cell lines, caspase-3 activity and PARP cleavage assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis confirming RNA-binding domain requirement, gene-editing KO with defined apoptotic phenotype\",\n      \"pmids\": [\"32647012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 and DHX30 bind a CG-rich 3'UTR motif (CGPD-motif) and form a complex that represses translation of mRNAs carrying this motif in cells undergoing p53-dependent cell cycle arrest. Upon DHX30 depletion, CGPD-motif mRNA translation increases and the p53 response shifts toward apoptosis.\",\n      \"method\": \"Polysome profiling, UV-crosslinking/RIP to identify CGPD-motif interactors, DHX30 depletion/overexpression, translation and apoptosis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling plus direct interactor identification, functional shift to apoptosis on DHX30 depletion, single lab\",\n      \"pmids\": [\"32234473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 binds C-rich elements in the 3'UTR of sortilin mRNA and stabilizes it. Knockdown of PCBP2 decreases sortilin transcripts. Zn2+ reversibly inhibits the nucleotide-binding ability of PCBP2 in vitro, suggesting a Zn2+-sensitive mRNA stabilization mechanism.\",\n      \"method\": \"PCBP2 knockdown, mRNA stability assay, in vitro Zn2+ inhibition of RNA binding\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'UTR binding and mRNA stability, Zn2+ inhibition in vitro, single lab\",\n      \"pmids\": [\"31961070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 stabilizes type I collagen α1(I) mRNA by binding its 3' end, increasing mRNA half-life. Alcohol upregulates PCBP2 in hepatic stellate cells, leading to increased collagen mRNA stability; siRNA knockdown of PCBP2 increases the decay rate of collagen α1(I) mRNA.\",\n      \"method\": \"PCBP2 siRNA, in vitro mRNA decay assay, Western blot for PCBP2 and collagen\",\n      \"journal\": \"Pharmaceutical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA decay assay demonstrating stabilization, functional knockdown, single lab\",\n      \"pmids\": [\"21643860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 directly binds the 3'UTR of RRM1 mRNA and cooperates with LINC02535 lncRNA to stabilize RRM1 mRNA. PCBP2 and LINC02535 co-localize in the cytoplasm, and together they promote DNA damage repair in cervical cancer cells.\",\n      \"method\": \"Co-IP, RIP, mRNA stability assay, co-localization by immunofluorescence, knockdown of PCBP2/LINC02535\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP and RIP show interaction, functional readout established, but mechanistic detail is limited\",\n      \"pmids\": [\"32324262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCBP2 structure: cryo-EM reconstruction of full-length PCBP2 in complex with the apical region of poliovirus IRES stem-loop IV (SLIVm) resolved to 6.1 Å. PCBP2 interacts with the cruciform RNA via KH domains, featuring a prominent GNRA tetraloop. Cleavage of PCBP2 in its linker region by poliovirus 3CD proteinase makes the complex more flexible and reduces PCBP2 affinity for SLIVm, as shown by SEC-SAXS, SHAPE, hydroxyl-radical cleavage, and limited proteolysis/REMSA.\",\n      \"method\": \"CryoEM structure determination, SEC-SAXS, SHAPE analysis, hydroxyl-radical cleavage, REMSA, limited proteolysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus multiple orthogonal biochemical validations in a single study\",\n      \"pmids\": [\"32556302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PCBP2 directly interacts with cGAS and negatively regulates its enzymatic activity by antagonizing cGAS condensation (phase separation), reducing cGAMP production and thereby dampening cGAS-STING antiviral signaling. PCBP2 overexpression reduces antiviral signaling; PCBP2 loss increases cGAS activity.\",\n      \"method\": \"Co-immunoprecipitation, cGAMP production assay, cGAS condensation assay, PCBP2 overexpression/depletion with STING signaling readout\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct interaction confirmed by co-IP, cGAMP assay, condensation assay, multiple functional readouts, published in high-impact journal\",\n      \"pmids\": [\"35322803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PCBP1 and PCBP2 are together required for erythroid differentiation; combined conditional inactivation causes midgestational repression of erythroid/hematopoietic gene expression, loss of blood formation, and fetal demise. They mediate overlapping and isoform-specific impacts on hematopoietic lineage transcriptome including mRNA representation and exon splicing.\",\n      \"method\": \"Conditional double knockout mouse model, RNA-seq transcriptome and splicing analysis, ex vivo primary erythroid progenitor cultures\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double KO with defined erythroid phenotype, RNA-seq mechanistic analysis\",\n      \"pmids\": [\"34180713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PCBP2 knockdown in malignant mesothelioma cells significantly decreases TfR1 and FTH expression and inhibits proliferation, indicating stagnation of intracellular iron transport. PCBP2 knockdown increases sensitivity to erastin-induced ferroptosis by increasing catalytic Fe(II) levels.\",\n      \"method\": \"siRNA knockdown, Western blot for TfR1/FTH, Fe(II) measurement, erastin-induced ferroptosis assay\",\n      \"journal\": \"Pathology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional iron transport and ferroptosis readouts, single lab\",\n      \"pmids\": [\"35089637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PCBP2 knockdown in pancreatic stellate cells and fibroblasts reverses accumulation of type I collagen in the extracellular matrix, normalizing desmoplastic stroma and enhancing drug penetration into PDAC tumors.\",\n      \"method\": \"siRNA knockdown, in vitro collagen quantification, spheroid drug penetration assay, orthotopic mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with defined collagen mRNA stability readout, functional in vivo model, single lab\",\n      \"pmids\": [\"33500719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PCBP2 knockdown in extravillous trophoblasts (EVTs) impairs differentiation toward an invasive phenotype and causes transcript switching (alternative splicing) in genes controlling cellular assembly, proliferation, and cell cycle, with minimal effect on mRNA expression levels.\",\n      \"method\": \"siRNA knockdown, RNA-seq splicing analysis, Transwell invasion assay, placental explant culture\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq splicing analysis with functional invasion assay, ex vivo placental explants, single lab\",\n      \"pmids\": [\"34095140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pcbp2 is essential for CD4+ T cell (Tconv) proliferation via regulation of co-stimulatory signaling. Pcbp2 deficiency in the CD4+ lineage does not affect Treg function but impairs Tconv proliferation and in vivo activation. Pcbp2 controls Runx1 exon 6 splicing in CD4+ T cells, connecting this splicing function to peripheral lymphocyte pool maintenance.\",\n      \"method\": \"Conditional Pcbp2 knockout in CD4+ T cells, proliferation assay, adoptive transfer colitis model, splicing analysis of Runx1 exon 6\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined proliferative and splicing readouts, single lab\",\n      \"pmids\": [\"36632062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PCBP2 is required for pancreatic β cell function and adaptation to glucose. PCBP2 is induced by elevated glucose in primary mouse islets; Pcbp2-deficient β cells exhibit defects in calcium flux, insulin granule ultrastructure and exocytosis, and the amplification pathway of insulin secretion. PCBP2 impacts basal and glucose-regulated mRNAs encoding core components of the insulin secretory pathway.\",\n      \"method\": \"β cell-specific Pcbp2 knockout, transcriptomic analysis, calcium flux assay, electron microscopy of insulin granules, insulin secretion assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type specific KO with multiple orthogonal functional readouts (calcium, EM, secretion), primary human islets also studied\",\n      \"pmids\": [\"38950317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PCBP1 and PCBP2 are required together for sustaining global mRNA translation in pancreatic β cells by stabilizing mRNAs encoding core translation initiation factors and ribosomal proteins through direct binding. Combined Pcbp1/2 deletion causes severe diabetes due to compromised β cell viability.\",\n      \"method\": \"β cell-specific Pcbp1 and combined Pcbp1/2 knockout, scRNA-seq, RIP for mRNA-protein interactions, mRNA stability assays, puromycin labeling for global translation monitoring\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional double KO, RIP, mRNA stability, global translation monitoring, multiple orthogonal methods\",\n      \"pmids\": [\"40451383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PCBP2 stabilizes the mRNA of system Xc- components (SLC3A2/SLC7A11) and limits HIF1α/p300-HMGB1 signaling. In hepatic ischemia-reperfusion injury (HIRI), decreased PCBP2 compromises system Xc- stability, promotes ferroptosis, and enables HIF1α-driven HMGB1 secretion that worsens macrophage recruitment.\",\n      \"method\": \"PCBP2 knockdown in hepatocytes, mRNA stability assay for Slc3a2/Slc7a11, binding assay, HIRI mouse model with hepatocyte-specific PCBP2 knockdown\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA stability and binding assay, in vivo hepatocyte-specific KD model, single lab\",\n      \"pmids\": [\"40486855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Duck PCBP2 promotes DHAV-1 (picornavirus) replication via KH1 domain (aa 1–92) interaction with the viral RNA-dependent RNA polymerase 3Dpol, and facilitates IRES-mediated translation through interaction with stem-loop domains II and III of the DHAV-1 IRES.\",\n      \"method\": \"Biotinylated RNA pull-down, co-IP with 3Dpol, domain-specific interaction mapping, viral replication/translation assays\",\n      \"journal\": \"Veterinary research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct pull-down and co-IP with domain mapping, functional replication readout; avian ortholog but consistent with established PCBP2 picornavirus mechanism\",\n      \"pmids\": [\"39300570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 acts as a direct interactor of an intracellular retention motif on miRNAs, binding miRNAs containing this motif (demonstrated by CLIP, RNA pull-down, and proteomics). PCBP2 requires SYNCRIP (an EV miRNA loader) for binding, as shown by SYNCRIP knockdown abolishing PCBP2-miRNA interaction. PCBP2 and SYNCRIP can co-bind miRNAs simultaneously (EMSA). PCBP2 acts as a dominant inhibitor of SYNCRIP-dependent miRNA loading into extracellular vesicles.\",\n      \"method\": \"CLIP coupled to RNA pull-down and proteomics, mutagenesis of retention motif, SYNCRIP knockdown, EMSA, PCBP2 knockdown with EV miRNA quantification\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (CLIP, pull-down, proteomics, EMSA, mutagenesis), functional EV loading readout\",\n      \"pmids\": [\"40601477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 directly interacts with PARP1 mRNA, inhibiting m6A methylation at PARP1 mRNA and stabilizing it, leading to increased PARP1 expression and enhanced DNA repair activity that contributes to olaparib resistance in BRCA-mutated breast cancer.\",\n      \"method\": \"Co-IP of PCBP2 with PARP1 mRNA, m6A methylation assay, mRNA stability assay, knockdown/overexpression functional resistance assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA binding and m6A inhibition demonstrated, functional resistance readout, single lab\",\n      \"pmids\": [\"40773674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 forms biomolecular condensates via phase separation in Alzheimer's disease brain. These condensates sequester mitochondrial and mRNA-binding proteins, impairing mitochondrial function and BACE1 mRNA stability. The small molecule CN-0928 binds INTS1, reduces PCBP2 protein level, inhibits condensate formation, and mitigates AD pathology.\",\n      \"method\": \"Phase separation assays, proteomics of condensate contents, PCBP2 level modulation, AD mouse models, CN-0928 target identification (INTS1 binding), cognitive readouts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — condensate formation and protein sequestration demonstrated, pharmacologic target identified, in vivo efficacy shown, single lab\",\n      \"pmids\": [\"41298370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 is identified as an i-motif DNA-interacting protein. By destabilizing the i-motif structure, PCBP2 simultaneously reduces the mechanical stability of the facing G-quadruplex (by ~13.7 kcal/mol), enabling a replisome to bypass these DNA structural barriers during genome replication.\",\n      \"method\": \"Single-molecule force spectroscopy, PCBP2 identification as i-motif binding protein, quantitative mechanical stability measurements\",\n      \"journal\": \"Angewandte Chemie (International ed. in English)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — single-molecule reconstitution with quantitative measurements, but single study and novel/unexpected activity\",\n      \"pmids\": [\"41327866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A lncRNA BASP1-AS1 assembles a complex with ULK1 and LDHA, activating LDHA to increase lactate, which triggers PCBP2 K115 lactylation. This modification disrupts PCBP2-ARIH2 interaction, inhibiting ubiquitin-dependent degradation and stabilizing PCBP2 protein, which then suppresses ferroptosis and confers oxaliplatin resistance in gastric cancer.\",\n      \"method\": \"Multi-omics profiling, co-IP, ubiquitination assay, protein stability assay, LDHA activity assay, K115 lactylation site identification, organoid models\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific lactylation site identified, ARIH2 interaction mapped, ubiquitination and stability assays, single lab\",\n      \"pmids\": [\"40914325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 promotes MAVS K48-linked polyubiquitination and proteasomal degradation during Dabie bandavirus (DBV/SFTS virus) infection, suppressing the MAVS-TBK1-IRF3 axis and type I interferon responses. PCBP2 overexpression enhances DBV replication; knockdown reduces it.\",\n      \"method\": \"Co-IP of PCBP2 with MAVS, ubiquitination assay, proteasome inhibitor treatment, PCBP2 overexpression/knockdown with IFN signaling and viral replication readouts\",\n      \"journal\": \"Virus research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct PCBP2-MAVS interaction and ubiquitination assay confirmed, functional antiviral readout, single lab\",\n      \"pmids\": [\"41638535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCBP2 was identified as the direct binding target of the immunosuppressive agent 15-deoxyspergualin (DSG) by pull-down assay. DSG treatment shifts PCBP2 intracellular localization from nucleus to cytoplasm. Overexpression of PCBP2 reduces the anti-proliferative activity of DSG.\",\n      \"method\": \"Biotinylated DSG probe pull-down, DSG binding confirmation, subcellular fractionation after DSG treatment, PCBP2 overexpression rescue assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pull-down identifies DSG binding to PCBP2 and localization change shown, but mechanism is limited and single lab\",\n      \"pmids\": [\"27261432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 promotes EGFR-driven tumor angiogenesis by binding miRNAs containing a 'GGGU' motif and promoting their loading into small extracellular vesicles (sEVs). EGFR overexpression transcriptionally upregulates PCBP2 protein, strengthening its binding to these miRNAs and their secretion via sEVs. PCBP2 depletion impairs EGFR-driven angiogenesis.\",\n      \"method\": \"miRNA pull-down assays, small RNA sequencing, PCBP2 depletion with sEV miRNA quantification, EGFR overexpression, co-culture and murine tumor models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pull-down and sequencing identify motif-based mechanism, functional angiogenesis readout in vivo, single lab\",\n      \"pmids\": [\"39816681\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PCBP2 is a multifunctional KH-domain RNA-binding protein that operates as: (1) a translational repressor binding 5'UTR poly(C)/CU-rich sequences of target mRNAs (e.g., CEBPA), a function regulated by ERK1/2-mediated phosphorylation and counteracted by miR-328 acting as an RNA decoy; (2) an mRNA stabilizer binding 3'UTR C-rich elements of numerous mRNAs (STAT1/2, p73, CDK2, collagen α1(I), SLC7A11, and others); (3) a cytosolic iron chaperone that delivers Fe(II) to non-heme iron enzymes including HIF prolyl hydroxylases, DOHH, and aconitase, and mediates iron-dependent interactions with DMT1 and ferroportin for cellular iron import and export; (4) a negative regulator of innate immune signaling through direct interaction with MAVS, promoting its K48-linked polyubiquitination and proteasomal degradation, a process enhanced by NLRX1 recruitment and IRTKS-mediated sumoylation of PCBP2; (5) a splicing regulator promoting Runx1 exon 6 inclusion, thereby governing definitive erythropoiesis and T cell function; (6) a structural IRES co-factor engaging poliovirus and other picornavirus IRESs through its KH domains, cleaved by viral 3CD proteinase to switch templates from translation to RNA replication; (7) a negative regulator of cGAS condensation and enzymatic activity dampening cGAS-STING antiviral signaling; (8) a phase-separating protein whose condensates can sequester mitochondrial and mRNA-binding proteins; and (9) an inhibitor of SYNCRIP-dependent miRNA loading into extracellular vesicles.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PCBP2 (hnRNP E2) is a multifunctional KH-domain poly(C)-binding protein that governs gene expression post-transcriptionally through sequence-specific binding to C-rich/CU-rich elements in target mRNAs, with additional roles as a cytosolic iron chaperone, splicing regulator, and modulator of innate immune signaling [#0, #3, #23]. As a translational regulator, it binds the 5'UTR of CEBPA to block C/EBPα synthesis in BCR-ABL+ myeloid cells, a repression that requires ERK1/2-mediated phosphorylation at defined serine/threonine residues to stabilize PCBP2 and is relieved by miR-328 acting as a seed-independent RNA decoy that competes for binding [#0, #1, #2]. Conversely, PCBP2 binds C-rich elements in numerous 3'UTRs to stabilize their mRNAs—including STAT1/STAT2, p73, CDK2, collagen α1(I), and system Xc- components SLC3A2/SLC7A11—thereby tuning antiviral, senescence, proliferative, fibrotic, and ferroptosis programs [#13, #20, #17, #28, #39]. Independent of RNA binding, PCBP2 functions as an iron chaperone delivering Fe(II) to non-heme iron enzymes such as the HIF prolyl hydroxylases, asparaginyl hydroxylase FIH1, deoxyhypusine hydroxylase, and aconitase, and it binds ferroportin in an iron-dependent manner to support cellular iron handling [#3, #8, #9]. In innate immunity, sumoylated PCBP2 is recruited to MAVS—enhanced by NLRX1—to drive MAVS K48-linked polyubiquitination and proteasomal degradation, dampening interferon responses, and it separately interacts with cGAS to antagonize its condensation and enzymatic activity [#11, #21, #31, #46]. PCBP2 also acts as a splicing regulator: it promotes Runx1 exon 6 inclusion required for definitive erythropoiesis and CD4+ T cell proliferation, and Pcbp2-null embryos die at midgestation with cardiovascular and hematopoietic defects [#23, #36, #12]. It is a structural co-factor for picornavirus IRES function, engaging poliovirus stem-loop IV via its KH domains in a complex remodeled by 3CD proteinase cleavage that switches the viral template from translation to replication [#5, #30]. PCBP2 binds heavily oxidized (8-oxoG) RNA, forms phase-separating condensates, and inhibits SYNCRIP-dependent miRNA loading into extracellular vesicles, defining additional roles in stress responses, condensate biology, and intercellular RNA trafficking [#25, #43, #41].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that PCBP2/hnRNP E2 is a translational repressor controlling myeloid differentiation by binding the CEBPA 5'UTR, linking it to BCR-ABL leukemogenesis.\",\n      \"evidence\": \"Ectopic expression and CEBPA protein vs. mRNA readouts in myeloid precursors\",\n      \"pmids\": [\"11753385\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the precise 5'UTR binding element\", \"Mechanism of translational block (initiation step) not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved how oncogenic signaling activates PCBP2 by showing ERK1/2 phosphorylation at specific Ser/Thr sites stabilizes the protein and is required for CEBPA repression.\",\n      \"evidence\": \"Site-directed S/T→A mutagenesis, MAPK inhibition, differentiation rescue\",\n      \"pmids\": [\"17475908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation alters RNA-binding affinity structurally not shown\", \"Phosphatase counter-regulation unaddressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a decoy mechanism whereby miR-328 binds PCBP2 seed-independently to derepress CEBPA, establishing a non-canonical RNA-protein regulatory axis.\",\n      \"evidence\": \"RNA-protein interaction and differentiation rescue assays in CML-BC blasts\",\n      \"pmids\": [\"20211135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry/affinity of miR-328 vs. mRNA competition not quantified\", \"Whether other miRNAs use similar decoy logic unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a distinct biochemical activity—iron chaperoning—by showing PCBP1/2 deliver Fe(II) to HIF prolyl hydroxylases and FIH1, coupling PCBP2 to oxygen sensing.\",\n      \"evidence\": \"RNAi depletion, in vitro reconstitution with purified Fe-PCBP1, co-IP, hydroxylation assays\",\n      \"pmids\": [\"22055506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PCBP2-PHD physical binding (vs. PCBP1) less defined\", \"How a KH-domain protein coordinates iron structurally unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended the iron-chaperone role to DOHH and aconitase, showing PCBP2 metallates multiple non-heme iron enzymes regulating hypusination and metabolism.\",\n      \"evidence\": \"siRNA depletion, in vitro metallation with lysates, co-IP, enzyme activity assays\",\n      \"pmids\": [\"24843120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity rules for which iron enzymes PCBP2 serves not established\", \"Handoff mechanism to dinuclear sites unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected PCBP2 to iron efflux by demonstrating iron-dependent, paralog-specific binding to ferroportin required for cellular iron export.\",\n      \"evidence\": \"Reciprocal co-IP in yeast and mammalian systems, FPN1 domain mapping, iron export assay\",\n      \"pmids\": [\"27302059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of iron-dependent FPN1 recognition not shown\", \"Directionality of iron transfer at the membrane unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified PCBP2 as a negative regulator of innate immunity, with IRTKS-driven sumoylation triggering cytoplasmic relocation and MAVS degradation.\",\n      \"evidence\": \"Sumoylation assays, fractionation, MAVS ubiquitination/degradation with proteasome inhibitors\",\n      \"pmids\": [\"26348439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 ligase ubiquitinating MAVS in this pathway not defined\", \"Which SUMO acceptor lysines on PCBP2 unmapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated a non-redundant in vivo requirement for PCBP2 in development, with knockout embryos dying at midgestation from cardiovascular and hematopoietic defects.\",\n      \"evidence\": \"Targeted knockout mouse, histological and hematopoietic analysis\",\n      \"pmids\": [\"26527618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target mediating the embryonic phenotype not pinpointed in this study\", \"Tissue-of-origin of lethality unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established PCBP2 as a 3'UTR-binding mRNA stabilizer in antiviral defense by stabilizing STAT1/STAT2 transcripts to enhance IFN-α activity.\",\n      \"evidence\": \"RIP-qPCR, half-life assays, biotinylated 3'UTR pull-down in HCV replicon cells\",\n      \"pmids\": [\"22022391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How stabilization mechanistically opposes its MAVS-degrading role not reconciled\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Broadened the 3'UTR-stabilization principle across cell-fate and disease contexts (p73, CDK2, ARHGDIA, GPR56, collagen), showing PCBP2 can also prime miRNA access via local RNA structural change.\",\n      \"evidence\": \"RIP, mRNA stability and structure-probing assays, functional epistasis in glioma/gastric/cardiac models\",\n      \"pmids\": [\"26907686\", \"29744291\", \"26761212\", \"26116532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Rules determining stabilization vs. destabilization of a bound mRNA unresolved\", \"Individual targets validated in single labs\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a developmentally critical splicing function: PCBP2 promotes Runx1 exon 6 inclusion required for definitive erythropoiesis, validated by phenocopy.\",\n      \"evidence\": \"Knockout mouse, RNA-seq splicing, Runx1ΔE6 genetic phenocopy\",\n      \"pmids\": [\"29866654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cis-elements bound on Runx1 pre-mRNA not mapped\", \"Spliceosomal partners mediating inclusion unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed PCBP2 senses oxidized RNA (8-oxoG) via its RNA-binding domains and suppresses apoptosis under oxidative stress, opposite to PCBP1.\",\n      \"evidence\": \"8-oxoG RNA binding assays, RBD mutagenesis, PCBP2-KO cells with caspase/PARP readouts\",\n      \"pmids\": [\"32647012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors of the anti-apoptotic effect not identified\", \"Fate of oxidized RNA bound by PCBP2 unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the structural basis of PCBP2's IRES co-factor activity and how viral 3CD cleavage remodels the complex to switch translation to replication.\",\n      \"evidence\": \"6.1 Å cryo-EM of PCBP2-poliovirus SLIVm plus SEC-SAXS, SHAPE, REMSA, limited proteolysis\",\n      \"pmids\": [\"32556302\", \"24371074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution contacts not achieved at 6.1 Å\", \"Generalizability to other picornaviral IRESs only partially tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed PCBP1 and PCBP2 act together to sustain the erythroid/hematopoietic transcriptome and splicing program, with combined loss causing fetal demise.\",\n      \"evidence\": \"Conditional double knockout mouse, RNA-seq, ex vivo erythroid progenitor cultures\",\n      \"pmids\": [\"34180713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Paralog-specific vs. shared targets only partially separated\", \"Direct binding maps not generated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a second innate-immune brake: PCBP2 binds cGAS and antagonizes its phase separation to limit cGAMP production and STING signaling.\",\n      \"evidence\": \"Co-IP, cGAMP and cGAS condensation assays, gain/loss with STING readout\",\n      \"pmids\": [\"35322803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNA binding is required for cGAS regulation unclear\", \"Structural basis of condensation antagonism unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established PCBP2 (with PCBP1) as essential for β cell function and global translation by stabilizing mRNAs of the insulin secretory pathway and translation machinery.\",\n      \"evidence\": \"β cell-specific single and double knockouts, RIP, mRNA stability, puromycin labeling, calcium/EM/secretion assays\",\n      \"pmids\": [\"38950317\", \"40451383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding sites on translation-factor mRNAs not fully enumerated\", \"Relative contributions of stabilization vs. splicing in β cells unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined PCBP2 as a regulator of intercellular RNA trafficking, acting as a dominant inhibitor or promoter of miRNA loading into extracellular vesicles depending on motif and context.\",\n      \"evidence\": \"CLIP, RNA pull-down, proteomics, EMSA, SYNCRIP knockdown and EV miRNA quantification; EGFR-driven angiogenesis models\",\n      \"pmids\": [\"40601477\", \"39816681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apparent opposing effects on EV miRNA loading across contexts not mechanistically reconciled\", \"Determinants switching inhibitory vs. promoting roles unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated PCBP2 condensation and DNA-structure binding in disease and replication, linking phase separation to Alzheimer's pathology and i-motif/G-quadruplex resolution during genome replication.\",\n      \"evidence\": \"Phase separation/proteomics with AD models and CN-0928; single-molecule force spectroscopy on i-motif DNA\",\n      \"pmids\": [\"41298370\", \"41327866\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNA-binding activity is a single-study novel finding awaiting independent confirmation\", \"Physiological trigger of pathological condensation unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how PCBP2 integrates its disparate activities—mRNA stabilization vs. degradation, iron chaperoning, splicing, innate-immune suppression, and condensate formation—and what determines target and activity selection in a given cell.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking RNA-binding to iron-chaperone functions\", \"Determinants of stabilization vs. destabilization of bound mRNAs unknown\", \"Switching logic between immune-promoting and immune-suppressing outcomes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 13, 20, 17, 25, 41]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [3, 8, 9]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 24, 26]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [44]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10, 11, 29]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [10, 11, 47]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 13, 20, 41]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 21, 31, 46]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 8, 9, 33]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [23, 32, 36]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [38]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MAVS\", \"NLRX1\", \"cGAS\", \"SYNCRIP\", \"DHX30\", \"FPN1\", \"SRp75\", \"PARP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}