{"gene":"DNAJC3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"P58(IPK) is activated during influenza virus infection by promoting dissociation of Hsp40 (hsp40) from P58(IPK). Under normal conditions, P58(IPK) exists in an inactive complex with hsp40. Upon influenza infection, hsp40 dissociates, freeing P58(IPK). Additionally, P58(IPK) forms a trimeric complex with hsp40 and hsp/Hsc70, and like other J-domain proteins, P58(IPK) stimulates the ATPase activity of Hsc70, establishing P58(IPK) as a co-chaperone that directs hsp/Hsc70 activity.","method":"Co-immunoprecipitation, ATPase activity assay, dissociation/activation assays in influenza-infected cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ATPase activity assay, and mechanistic dissociation experiments in a focused single-gene study with multiple orthogonal methods","pmids":["9920933"],"is_preprint":false},{"year":1996,"finding":"P58(IPK) inhibition of PKR and stimulation of protein synthesis in vivo requires two specific domains: the DnaJ similarity region at the C-terminus (amino acids 391–504) and the tetratricopeptide repeat 6 (TPR6) domain (amino acids 222–255). Variants lacking either domain fail to stimulate translation or block PKR activity in vitro.","method":"Transfection analysis with deletion mutants, in vitro PKR inhibition assays, reporter gene (SEAP) translation assays in COS-1 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — domain mutagenesis combined with in vitro PKR assay and cell-based translation reporter, multiple orthogonal methods in single focused study","pmids":["8910500"],"is_preprint":false},{"year":1999,"finding":"P58(IPK) suppresses PKR-dependent eIF2α phosphorylation and NF-κB activation induced by dsRNA, protecting cells from dsRNA-induced apoptosis via a mechanism requiring the TPR6 domain (PKR-binding). Additionally, P58(IPK) suppresses TNF-α-induced apoptosis independently of its PKR-inhibitory function, indicating a broader antiapoptotic role.","method":"Stable NIH 3T3 cell lines expressing wild-type or ΔTPR6 P58(IPK); treatment with dsRNA or TNF-α; measurement of eIF2α phosphorylation, NF-κB activation, and apoptosis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO/mutant cell lines with multiple mechanistic readouts (eIF2α phosphorylation, NF-κB, apoptosis), domain-specific dissection","pmids":["10373525"],"is_preprint":false},{"year":2002,"finding":"P58(IPK) inhibition of PKR kinase activity and stimulation of mRNA translation does not require classical J-domain function (HPD motif). HPD point mutations abolish J-domain ATPase-stimulatory activity toward Hsp70 but do not prevent PKR inhibition or support of mRNA translation in mammalian cells. However, the P58(IPK) J domain can substitute functionally for J domains of bacterial DnaJ and yeast Ydj1 in growth rescue assays.","method":"Site-directed mutagenesis of HPD motif; yeast and E. coli J-domain functional rescue assays; Hsc70 ATPase activity assay; mammalian cell translation assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro ATPase assay plus mutagenesis plus cell-based translation assays across multiple organisms; multiple orthogonal methods","pmids":["11939789"],"is_preprint":false},{"year":2002,"finding":"P58(IPK) is transcriptionally induced during ER stress via an ER stress-response element (ERSE) in its promoter. P58(IPK) interacts with and inhibits the ER-localized eIF2α kinase PERK. Overexpression of P58(IPK) reduces eIF2α phosphorylation during ER stress, while P58(IPK)-mutant cells show elevated eIF2α phosphorylation and increased BiP and CHOP expression, consistent with prolonged PERK signaling.","method":"ERSE promoter reporter assay; co-immunoprecipitation of P58(IPK) with PERK; Western blot for p-eIF2α in overexpressing and mutant cells; gene expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ERSE reporter, loss-of-function and gain-of-function with defined molecular readouts in a single focused study","pmids":["12446838"],"is_preprint":false},{"year":2002,"finding":"P52(rIPK) interacts with P58(IPK) through its 114-amino-acid charged domain binding specifically to TPR domain 7 of P58(IPK), the domain adjacent to the TPR motif required for PKR interaction. This interaction inhibits P58(IPK) function and its regulation of PKR activity, eIF2α phosphorylation, and cell growth. P52(rIPK) and P58(IPK) form a stable intracellular complex during acute cytoplasmic stress.","method":"Domain mapping with deletion constructs; in vitro binding assays; co-immunoprecipitation; cell growth and eIF2α phosphorylation assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-level mapping, reciprocal binding assays, and functional cell-based readouts across multiple conditions","pmids":["12269832"],"is_preprint":false},{"year":2003,"finding":"P58(IPK) is induced during ER stress and functions as a negative feedback inhibitor of the PERK–eIF2α–ATF4 pathway. Overexpression of P58(IPK) inhibits eIF2α phosphorylation and reduces ATF4 and Gadd153 accumulation; silencing P58(IPK) enhances eIF2α phosphorylation and increases ATF4 and Gadd153. Induction of P58(IPK) during ER stress is mediated via ATF6.","method":"Microarray analysis; overexpression and siRNA knockdown of P58(IPK); Western blot for p-eIF2α, ATF4, Gadd153","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function with defined molecular readouts; two orthogonal intervention approaches (overexpression + siRNA) replicated internally","pmids":["12601012"],"is_preprint":false},{"year":2006,"finding":"P58(IPK)/DNAJC3 associates with the ER protein translocation channel Sec61 at the cytosolic face and recruits HSP70 chaperones to that site. P58(IPK) can be crosslinked to nascent proteins entering the ER that are delayed at the translocon. Proteasome-mediated cytosolic degradation of translocating proteins delayed at Sec61 is P58(IPK)-dependent. In P58(IPK)-/- mice, cells with high secretory burden are markedly impaired in coping with ER stress.","method":"Co-immunoprecipitation with Sec61; HSP70 recruitment assay; crosslinking of nascent polypeptides; proteasome inhibitor experiments; P58(IPK)-/- mouse model","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — crosslinking, reciprocal Co-IP, in vivo KO model with secretory cell phenotype, multiple orthogonal methods in a single rigorous study","pmids":["16923392"],"is_preprint":false},{"year":2007,"finding":"P58(IPK) resides in the ER lumen in association with BiP. ER lumenal P58(IPK) can be co-immunoprecipitated with newly synthesized secretory proteins in vitro and stimulates protein maturation upon overexpression. The stress sensitivity of p58-/- cells is due to impaired protein processing capacity in the ER lumen, not to a defect in the preemptive quality control (pQC) cytosolic pathway or elevated ER substrate burden.","method":"Subcellular fractionation; co-immunoprecipitation with BiP and nascent secretory protein; overexpression in cells; stress assays in p58-/- cells; in vitro translation/translocation assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — fractionation establishing ER luminal localization, Co-IP with BiP and client, in vitro and cell-based functional assays, KO phenotype; multiple orthogonal methods","pmids":["17567950"],"is_preprint":false},{"year":2006,"finding":"P58(IPK) regulates influenza virus mRNA translation through a PKR-mediated mechanism independent of PERK. In P58(IPK)-/- mouse embryo fibroblasts, eIF2α phosphorylation increases and influenza virus mRNA translation decreases. Loss of PKR reverses these trends. Loss of PERK has minimal effect on influenza virus mRNA translation despite reduced eIF2α phosphorylation.","method":"P58(IPK)-/-, PKR-/-, and PERK-/- mouse embryo fibroblasts; metabolic labeling of viral protein synthesis; eIF2α phosphorylation assays; viral replication assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using multiple KO cell lines with defined molecular and viral replication readouts; orthogonal KO comparisons","pmids":["17166899"],"is_preprint":false},{"year":2005,"finding":"Deletion of P58(IPK) in mice results in gradual onset of glucosuria, hyperglycemia, and increasing apoptosis of pancreatic islet beta cells. Surviving beta cells are functionally intact, but the loss of P58(IPK) alters expression of apoptosis-associated genes in islets, implicating P58(IPK) as a negative feedback regulator of ER stress-associated apoptosis in secretory cells.","method":"P58(IPK)-null mouse generation; glucose and insulin measurements; histopathology; TUNEL apoptosis assay; gene expression arrays in islets","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with islet-specific histological and functional phenotype, replicated in multiple tissues; gene expression profiling as supporting evidence","pmids":["15793246"],"is_preprint":false},{"year":2010,"finding":"Crystal structure of the P58(IPK) TPR fragment determined to 2.5 Å resolution reveals three domains (I–III), each containing three TPR motifs. A conserved hydrophobic patch in domain I is required for binding misfolded proteins (luciferase, rhodanese). Structure-based mutagenesis of these hydrophobic residues significantly reduces P58(IPK) molecular chaperone activity.","method":"X-ray crystallography (SAD phasing, 2.5 Å); ELISA-based chaperone binding assay with luciferase and rhodanese; structure-based site-directed mutagenesis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis and in vitro chaperone activity assay; multiple orthogonal methods in a single focused study","pmids":["20184891"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of human P58(IPK) determined to 3.0 Å resolution shows a highly elongated monomer containing nine N-terminal TPR motifs in three subdomains and a C-terminal J domain attached via a flexible linker. The conserved HPD motif of the J domain is located ~100 Å from the putative misfolded protein-binding site in subdomain I, suggesting that P58(IPK) simultaneously engages substrate and BiP at spatially separated sites.","method":"X-ray crystallography (molecular replacement + SAD, 3.0 Å resolution)","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of human protein with structural interpretation; single study but structure is inherently high-tier evidence","pmids":["21799829"],"is_preprint":false},{"year":2011,"finding":"P58(IPK) is identified as an interacting partner of the Influenza A virus nucleoprotein (NP)–Hsp40 complex. During IAV infection, expression of NP coincides with dissociation of P58(IPK) from Hsp40 and decreased PKR phosphorylation. Plasmid-based NP expression alone reduces PKR phosphorylation; inhibiting NP expression activates PKR and eIF2α phosphorylation, reduces viral replication, and increases IFN-β production. NP is thus the viral factor activating P58(IPK)-mediated PKR inhibition.","method":"Yeast two-hybrid screen; co-immunoprecipitation from mammalian cells; co-localization by immunofluorescence; siRNA knockdown of NP; Western blot for PKR, p-PKR, p-eIF2α","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid confirmed by reciprocal Co-IP in mammalian cells plus functional siRNA knockdown with defined PKR and viral replication readouts","pmids":["21698289"],"is_preprint":false},{"year":2009,"finding":"GRP78va, a novel cytosolic isoform of GRP78, interacts with and antagonizes the PERK inhibitor P58(IPK), providing a negative regulatory mechanism on P58(IPK)'s ability to suppress PERK signaling in leukemic cells.","method":"siRNA-specific knockdown of GRP78va; co-immunoprecipitation of GRP78va with P58(IPK); PERK signaling assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP demonstrating interaction and siRNA functional data, but single lab, single paper with one primary binding method","pmids":["19718440"],"is_preprint":false},{"year":2010,"finding":"MK2 and MK3 (MAP kinase-activated protein kinases) interact with p88(rIPK), recruiting a tetrameric complex containing p88(rIPK), P58(IPK), and PKR, resulting in PKR inhibition during influenza A virus infection.","method":"Co-immunoprecipitation; MK2/MK3 KO cells and siRNA knockdown; viral replication and PKR phosphorylation assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of complex formation combined with KO cell and siRNA functional data; two orthogonal intervention approaches","pmids":["20484669"],"is_preprint":false},{"year":2010,"finding":"Influenza M2 protein (both A/M2 and BM2) interacts with Hsp40 and with P58(IPK) in vitro and in vivo. Formation of a stable M2–Hsp40–P58(IPK) complex enhances PKR autophosphorylation, in contrast to the inhibitory role of P58(IPK) in the absence of M2, suggesting M2 modulates the Hsp40–P58(IPK)–PKR regulatory axis.","method":"Yeast two-hybrid; co-immunoprecipitation; GST pull-down; PKR autophosphorylation assay","journal":"Protein & cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP and GST pull-down with functional PKR phosphorylation assay; single lab","pmids":["21204021"],"is_preprint":false},{"year":2016,"finding":"P58(IPK) suppresses NLRP3 inflammasome activation and IL-1β secretion in macrophages through inhibition of PKR. P58(IPK)-deficient macrophages show stronger PKR, NF-κB, and JNK activation; enhanced caspase-1 cleavage; and increased IL-1β maturation. A specific PKR inhibitor or P58(IPK) overexpression abolishes these changes. Co-immunoprecipitation confirmed direct binding of P58(IPK) to PKR but not to other TLR4 downstream signaling molecules.","method":"P58(IPK) KO bone marrow-derived macrophages; PKR inhibitor treatment; P58(IPK) overexpression; co-immunoprecipitation; caspase-1 cleavage, IL-1β ELISA","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO macrophages with rescue experiments (inhibitor and OE), reciprocal Co-IP for direct binding, multiple orthogonal mechanistic readouts","pmids":["27113095"],"is_preprint":false},{"year":2013,"finding":"P58(IPK) selectively attenuates the PERK–CHOP arm of the UPR during glucose shortage associated with malignant progression, enabling cells to overcome ER stress-induced apoptosis and benefit from chronic UPR protective features. Deletion of CHOP in a K-ras(G12V) lung cancer mouse model increases tumor incidence, confirming ER stress as a barrier to malignancy that p58(IPK) helps overcome.","method":"Genetic deletion of CHOP in K-ras(G12V) mouse lung cancer model; p58(IPK) expression manipulation; UPR pathway analysis; glucose flux experiments (hexosamine pathway)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model (CHOP KO in cancer) combined with UPR pathway epistasis and p58(IPK) functional manipulation; multiple orthogonal approaches","pmids":["23395000"],"is_preprint":false},{"year":2015,"finding":"In P58(IPK)-/- mice, beta cells develop oxidative stress and apoptosis via ER stress. Deletion of CHOP, treatment with a chemical chaperone, or dietary antioxidant supplementation restores beta-cell function and corrects abnormal MafA localization, placing oxidative stress as an essential proximal signal downstream of P58(IPK) loss required for ER-stress-induced apoptosis.","method":"P58(IPK)-/- mice; CHOP deletion rescue; chemical chaperone treatment; antioxidant diet; beta-cell function and mass measurements; MafA immunofluorescence","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological rescue approaches in vivo, pathway epistasis (CHOP deletion rescue), clean KO phenotype","pmids":["25795214"],"is_preprint":false},{"year":2010,"finding":"Loss of DNAJC3/p58(IPK) (a co-chaperone promoting ATP hydrolysis by BiP) in Sil1-/- mice ameliorates ER stress and neurodegeneration in Purkinje cells, revealing that alterations in the nucleotide exchange cycle of BiP cause ER stress and that reducing ATPase cycling via p58(IPK) loss can rescue neurodegeneration.","method":"Genetic epistasis: Sil1-/- crossed with Dnajc3-/- mice; assessment of ER stress markers, ubiquitylated inclusions, and Purkinje cell degeneration","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo (double KO) with histological and molecular phenotypic readouts; independently validates DNAJC3's co-chaperone function on BiP","pmids":["19801575"],"is_preprint":false},{"year":2016,"finding":"P58(IPK) specifically co-immunoprecipitates with misfolded (Akita) proinsulin but not with wild-type proinsulin in pancreatic beta cells, indicating P58(IPK) selectively associates with misfolded client proteins in the ER.","method":"Co-immunoprecipitation of FLAG-tagged wild-type and Akita proinsulin with endogenous chaperones; mass spectrometry identification; confirmed in two beta cell lines (MIN6 and βTC-6)","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP confirmed in two independent cell lines; selectivity for misfolded substrate established, but no mutagenesis or in vitro reconstitution","pmids":["26947243"],"is_preprint":false},{"year":2026,"finding":"BiP assembles in complexes with the cochaperone p58(IPK) (along with GRP170, ERdj3, PDIA1, PDIA6) that specifically bind nonnative proinsulin. p58(IPK) is required for productive proinsulin folding, as demonstrated by a genetically engineered mouse enabling pulldown of endogenous BiP complexes; nonstoichiometric BiP excess without p58(IPK) hinders proinsulin folding.","method":"Endogenous BiP complex pulldown from islet beta cells using genetically engineered mouse; co-immunoprecipitation; proinsulin folding assays with and without p58(IPK)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — endogenous complex pulldown from physiologically relevant tissue (islet beta cells) combined with functional proinsulin folding assays; multiple cochaperone partners identified","pmids":["42224595"],"is_preprint":false},{"year":2013,"finding":"Synthetic embryonic lethality results from combined deletion of p58(IPK) and ATF6α, demonstrating that the UPR can compensate for genetic impairment of ER protein folding (via p58(IPK)) during normal development, and that p58(IPK) has a required role in embryonic development when ATF6α is absent.","method":"Double-KO mouse (Atf6α-/- × p58(IPK)-/-); embryonic viability analysis; tissue histology","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis (double KO) with defined developmental phenotype; single lab, limited mechanistic follow-up beyond viability","pmids":["24275136"],"is_preprint":false},{"year":1996,"finding":"The human P58(IPK) gene (PRKRI) was mapped by fluorescence in situ hybridization to chromosome 13q32.","method":"Fluorescence in situ hybridization (FISH)","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromosomal localization by FISH; single study, single method, but definitive genomic mapping","pmids":["8824808"],"is_preprint":false},{"year":2009,"finding":"P58(IPK) promotes the co-translocational degradation pathway for ER-targeted polypeptides with unstructured domains. Overexpression of p58(IPK) promotes co-translocational/preemptive quality control degradation of ER-targeted unstructured polypeptides via the proteasome, particularly targeting N-terminally unstructured domains.","method":"Overexpression of p58(IPK) in cells expressing ER-targeted reporter polypeptides with varying secondary structure; proteasome inhibitor assays; translocation efficiency measurements","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based overexpression with defined substrate reporters and proteasome inhibitor validation; single lab, partially replicates earlier Cell paper findings","pmids":["19561072"],"is_preprint":false},{"year":2024,"finding":"Dnajc3 modulates axon regeneration in mouse retinal ganglion cells. Knockdown of Dnajc3 in a high-regenerative BXD strain reduces axon regeneration after optic nerve crush, while overexpression of Dnajc3 in a low-regenerative strain increases the number and distance of regenerating axons.","method":"Forward genetics in BXD recombinant mouse strains; AAV-mediated overexpression and shRNA knockdown; optic nerve crush model; cholera toxin B axon tracing","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint; gain- and loss-of-function in vivo but no molecular mechanism linking Dnajc3 to axon regeneration established; single lab, no peer review","pmids":[],"is_preprint":true}],"current_model":"DNAJC3/P58(IPK) is an ER-resident DnaJ co-chaperone containing nine TPR motifs (organized in three subdomains) and a C-terminal J domain, which under ER stress is transcriptionally induced (via XBP-1/ATF6) and functions in the ER lumen in association with BiP/Hsp70 to promote folding and proteasomal degradation of misfolded client proteins at the Sec61 translocon; it also inhibits the eIF2α kinases PKR (in the cytoplasm, via its TPR6 domain, regulated by dissociation from Hsp40) and PERK (in the ER), thereby acting as a negative feedback attenuator of eIF2α phosphorylation and translational repression during the later phases of the unfolded protein response, with loss of function causing beta-cell apoptosis, diabetes, neurodegeneration, and inflammasome hyperactivation through unrestrained PKR/PERK–eIF2α–CHOP signaling."},"narrative":{"mechanistic_narrative":"DNAJC3/P58(IPK) is a DnaJ co-chaperone that operates at the interface of protein folding and translational control during the unfolded protein response, acting as a negative-feedback regulator that protects secretory cells from ER-stress-induced apoptosis [PMID:12601012, PMID:15793246]. As a J-domain co-chaperone, it stimulates the ATPase activity of Hsp70/Hsc70 [PMID:9920933] and, in the ER lumen, associates with BiP to drive productive folding of secretory clients, including selective engagement of misfolded proinsulin [PMID:17567950, PMID:42224595]. Structurally it is an elongated monomer of nine TPR motifs arranged in three subdomains plus a C-terminal J domain, with a conserved hydrophobic patch in TPR subdomain I that binds misfolded substrates positioned ~100 Å from the J-domain HPD motif, allowing simultaneous engagement of client and BiP [PMID:20184891, PMID:21799829]. At the Sec61 translocon it recruits HSP70 to the cytosolic face and directs proteasomal co-translocational degradation of polypeptides delayed during import [PMID:16923392, PMID:19561072]. In parallel, P58(IPK) is transcriptionally induced during ER stress through ERSE/ATF6 and attenuates eIF2α phosphorylation by binding and inhibiting the eIF2α kinases PERK in the ER and PKR in the cytoplasm, the latter through its TPR6 domain and independently of classical J-domain activity [PMID:12446838, PMID:12601012, PMID:8910500, PMID:11939789]. This dampening of PERK–eIF2α–CHOP signaling limits oxidative stress and apoptosis, and its loss in mice causes beta-cell apoptosis and diabetes that is rescued by CHOP deletion or antioxidants [PMID:15793246, PMID:25795214]. Through PKR inhibition P58(IPK) also restrains dsRNA-induced apoptosis and NLRP3 inflammasome/IL-1β activation, and is co-opted by influenza nucleoprotein to suppress antiviral PKR signaling [PMID:10373525, PMID:27113095, PMID:21698289].","teleology":[{"year":1996,"claim":"Established which protein domains are necessary for P58(IPK) to inhibit the antiviral kinase PKR and stimulate translation, mapping function to discrete modules before the protein's chaperone identity was known.","evidence":"Deletion mutagenesis with in vitro PKR assays and a SEAP translation reporter in COS-1 cells","pmids":["8910500"],"confidence":"High","gaps":["Did not establish how TPR6 contacts PKR structurally","Did not address ER or chaperone functions"]},{"year":1999,"claim":"Defined P58(IPK) as a regulated co-chaperone whose PKR-inhibitory activity is switched on by dissociation from Hsp40, linking its activation to viral infection.","evidence":"Co-IP, ATPase activity assays, and dissociation experiments in influenza-infected cells","pmids":["9920933"],"confidence":"High","gaps":["Mechanism of the Hsp40-controlled inactive complex not structurally resolved","Viral trigger for dissociation not yet identified"]},{"year":1999,"claim":"Showed P58(IPK) protects cells from apoptosis through both PKR-dependent (dsRNA/eIF2α/NF-κB) and PKR-independent (TNF-α) routes, broadening its role beyond translational control.","evidence":"Wild-type vs ΔTPR6 stable NIH 3T3 lines with eIF2α, NF-κB, and apoptosis readouts","pmids":["10373525"],"confidence":"High","gaps":["PKR-independent antiapoptotic mechanism not defined"]},{"year":2002,"claim":"Separated P58(IPK)'s translational/PKR functions from canonical J-domain chaperone activity, showing the HPD motif is dispensable for PKR inhibition yet functionally interchangeable with bacterial/yeast J domains.","evidence":"HPD point mutagenesis, cross-species J-domain rescue, Hsc70 ATPase and mammalian translation assays","pmids":["11939789"],"confidence":"High","gaps":["How a functional J domain is used physiologically when not required for PKR inhibition"]},{"year":2002,"claim":"Identified P58(IPK) as an ER-stress-induced PERK inhibitor, extending its kinase-attenuating role from the cytoplasm to the ER UPR.","evidence":"ERSE reporter, PERK Co-IP, and p-eIF2α/BiP/CHOP readouts in overexpressing and mutant cells","pmids":["12446838"],"confidence":"High","gaps":["Direct kinase-domain contacts with PERK not mapped"]},{"year":2002,"claim":"Revealed negative regulation of P58(IPK) itself via P52(rIPK) binding to TPR7, defining an inhibitory layer adjacent to the PKR-binding TPR motif.","evidence":"Domain-mapped binding assays, Co-IP, and eIF2α/cell-growth readouts","pmids":["12269832"],"confidence":"High","gaps":["Physiological conditions controlling P52(rIPK) engagement unclear"]},{"year":2003,"claim":"Placed P58(IPK) as an ATF6-induced negative-feedback inhibitor of the PERK–eIF2α–ATF4 axis, defining its position in the late UPR.","evidence":"Microarray, overexpression and siRNA knockdown with p-eIF2α/ATF4/Gadd153 readouts","pmids":["12601012"],"confidence":"High","gaps":["Timing/kinetics of feedback relative to other UPR arms not quantified"]},{"year":2005,"claim":"Demonstrated in vivo that P58(IPK) loss drives beta-cell apoptosis and diabetes, establishing its physiological role as a feedback brake on ER-stress apoptosis in secretory cells.","evidence":"P58(IPK)-null mice with glucose/insulin measures, histopathology, TUNEL, and islet expression arrays","pmids":["15793246"],"confidence":"High","gaps":["Did not pinpoint which downstream signal (PERK vs PKR) causes the apoptosis"]},{"year":2006,"claim":"Localized P58(IPK) action to the Sec61 translocon, where it recruits HSP70 and directs proteasomal degradation of stalled translocating proteins, defining a quality-control function distinct from kinase inhibition.","evidence":"Sec61 Co-IP, HSP70 recruitment, nascent-chain crosslinking, proteasome inhibitors, and P58(IPK)-/- mice","pmids":["16923392"],"confidence":"High","gaps":["Relative contribution of translocon vs luminal pools to physiology unresolved"]},{"year":2006,"claim":"Used genetic epistasis to show P58(IPK) regulates influenza translation specifically through PKR, not PERK, distinguishing its two kinase targets.","evidence":"P58(IPK)-/-, PKR-/-, PERK-/- MEFs with viral protein labeling and eIF2α assays","pmids":["17166899"],"confidence":"High","gaps":["Context determining PKR vs PERK preference not defined"]},{"year":2007,"claim":"Resolved the apparent topological paradox by demonstrating an ER-lumenal P58(IPK) pool bound to BiP that promotes secretory-protein maturation, identifying luminal folding capacity as the basis of stress sensitivity in knockouts.","evidence":"Fractionation, Co-IP with BiP and nascent secretory client, overexpression and in vitro translocation assays in p58-/- cells","pmids":["17567950"],"confidence":"High","gaps":["Mechanism partitioning P58(IPK) between cytosol and ER lumen unknown"]},{"year":2009,"claim":"Linked P58(IPK) overexpression to co-translocational/preemptive proteasomal degradation of unstructured ER-targeted polypeptides, refining its quality-control specificity.","evidence":"ER-targeted reporters of varying structure with proteasome inhibitors and translocation measures","pmids":["19561072"],"confidence":"Medium","gaps":["Relies on overexpression; endogenous contribution not established","Substrate-selection rules for unstructured domains unclear"]},{"year":2009,"claim":"Identified GRP78va as an antagonist of P58(IPK)'s PERK inhibition, adding a regulatory node in leukemic cells.","evidence":"GRP78va siRNA knockdown, Co-IP with P58(IPK), and PERK signaling assays","pmids":["19718440"],"confidence":"Medium","gaps":["Single primary binding method without reciprocal validation","Generality beyond leukemic context untested"]},{"year":2010,"claim":"Provided genetic proof of P58(IPK)'s co-chaperone action on BiP's nucleotide cycle, showing that removing P58(IPK) rescues Sil1-loss neurodegeneration.","evidence":"Sil1-/- × Dnajc3-/- double-KO mice with ER-stress and Purkinje cell readouts","pmids":["19801575"],"confidence":"High","gaps":["Quantitative effect of P58(IPK) on BiP ATPase cycle in vivo not measured"]},{"year":2010,"claim":"Defined the atomic architecture of the TPR region and the hydrophobic patch in subdomain I needed for misfolded-protein binding, giving a structural basis for chaperone activity.","evidence":"2.5 Å crystal structure with ELISA chaperone assays and structure-based mutagenesis","pmids":["20184891"],"confidence":"High","gaps":["Substrate-bound structure not determined"]},{"year":2010,"claim":"Showed influenza co-opts P58(IPK) through accessory factors—MK2/MK3-recruited complexes and M2 protein—to modulate PKR, revealing virus-specific tuning of the axis.","evidence":"Co-IP, MK2/MK3 KO and siRNA, Y2H, GST pulldown, and PKR phosphorylation assays","pmids":["20484669","21204021"],"confidence":"Medium","gaps":["Opposite effects of complexes (inhibition vs activation) not mechanistically reconciled","Single-lab findings"]},{"year":2011,"claim":"Determined the full elongated human P58(IPK) structure, positioning the J-domain HPD ~100 Å from the substrate site to argue for simultaneous client and BiP engagement.","evidence":"3.0 Å crystal structure of human protein","pmids":["21799829"],"confidence":"High","gaps":["No co-structure with BiP or substrate to confirm the dual-engagement model"]},{"year":2011,"claim":"Identified influenza nucleoprotein as the viral factor that activates P58(IPK)-mediated PKR inhibition by dissociating it from Hsp40.","evidence":"Yeast two-hybrid, reciprocal Co-IP, co-localization, and NP siRNA with PKR/IFN-β readouts","pmids":["21698289"],"confidence":"High","gaps":["Structural basis of NP-induced Hsp40 dissociation unknown"]},{"year":2013,"claim":"Showed P58(IPK) attenuates the PERK–CHOP arm to let tumor cells survive glucose-limited ER stress, framing it as a barrier-overcoming factor in malignancy.","evidence":"CHOP deletion in K-ras(G12V) lung cancer mice with UPR/glucose-flux analysis","pmids":["23395000"],"confidence":"High","gaps":["Direct requirement of P58(IPK) for tumorigenesis not isolated from CHOP genetics"]},{"year":2013,"claim":"Demonstrated synthetic embryonic lethality of p58(IPK) with ATF6α, showing the UPR compensates for impaired ER folding during development.","evidence":"Atf6α-/- × p58(IPK)-/- double-KO embryonic viability and histology","pmids":["24275136"],"confidence":"Medium","gaps":["Mechanistic basis of lethality beyond viability not pursued","Single lab"]},{"year":2015,"claim":"Placed oxidative stress as a proximal apoptotic signal downstream of P58(IPK) loss in beta cells, with CHOP deletion, chemical chaperone, or antioxidants restoring function.","evidence":"P58(IPK)-/- mice with CHOP-deletion and pharmacological rescues, beta-cell and MafA readouts","pmids":["25795214"],"confidence":"High","gaps":["Source of oxidative stress downstream of ER stress not pinpointed"]},{"year":2016,"claim":"Connected P58(IPK) to innate immunity by showing it restrains NLRP3 inflammasome and IL-1β through direct PKR binding in macrophages.","evidence":"P58(IPK) KO BMDMs with PKR inhibitor/overexpression rescue, Co-IP, caspase-1 and IL-1β readouts","pmids":["27113095"],"confidence":"High","gaps":["Whether ER-localized vs cytosolic P58(IPK) mediates inflammasome control unclear"]},{"year":2016,"claim":"Established substrate selectivity by showing P58(IPK) binds misfolded Akita proinsulin but not wild-type, supporting recognition of nonnative clients.","evidence":"Reciprocal Co-IP of WT vs Akita proinsulin in two beta-cell lines with MS identification","pmids":["26947243"],"confidence":"Medium","gaps":["No mutagenesis or reconstitution to define the recognition determinant"]},{"year":2026,"claim":"Demonstrated P58(IPK) is a required component of endogenous BiP folding complexes for productive proinsulin folding, integrating its co-chaperone role into native tissue physiology.","evidence":"Endogenous BiP complex pulldown from islet beta cells via engineered mouse with proinsulin folding assays","pmids":["42224595"],"confidence":"High","gaps":["Stoichiometry and order of cochaperone assembly on BiP not resolved"]},{"year":null,"claim":"How P58(IPK) is partitioned and switched between its cytosolic kinase-inhibitory, translocon-associated, and ER-luminal folding functions—and how these are coordinated in human disease—remains unresolved.","evidence":"No single study in the corpus integrates the multiple subcellular pools and activities into one regulatory mechanism","pmids":[],"confidence":"Low","gaps":["No structural model of P58(IPK)–PKR or P58(IPK)–PERK complexes","Determinants of cytosol/ER partitioning unknown","No timeline evidence of a human Mendelian disease mutation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[8,11,22]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,4,6,17]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,7,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,7,17]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,6,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of 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Hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/29316085","citation_count":10,"is_preprint":false},{"pmid":"36748498","id":"PMC_36748498","title":"Pseudorabies virus infection induces endoplasmic reticulum stress and unfolded protein response in suspension-cultured BHK-21 cells.","date":"2022","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/36748498","citation_count":10,"is_preprint":false},{"pmid":"33254057","id":"PMC_33254057","title":"Porcine circovirus type 2 exploits cap to inhibit PKR activation through interaction with Hsp40.","date":"2020","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33254057","citation_count":10,"is_preprint":false},{"pmid":"24275136","id":"PMC_24275136","title":"Synthetic embryonic lethality upon deletion of the ER cochaperone p58(IPK) and the ER stress sensor ATF6α.","date":"2013","source":"Biochemical and biophysical research 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Under normal conditions, P58(IPK) exists in an inactive complex with hsp40. Upon influenza infection, hsp40 dissociates, freeing P58(IPK). Additionally, P58(IPK) forms a trimeric complex with hsp40 and hsp/Hsc70, and like other J-domain proteins, P58(IPK) stimulates the ATPase activity of Hsc70, establishing P58(IPK) as a co-chaperone that directs hsp/Hsc70 activity.\",\n      \"method\": \"Co-immunoprecipitation, ATPase activity assay, dissociation/activation assays in influenza-infected cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ATPase activity assay, and mechanistic dissociation experiments in a focused single-gene study with multiple orthogonal methods\",\n      \"pmids\": [\"9920933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"P58(IPK) inhibition of PKR and stimulation of protein synthesis in vivo requires two specific domains: the DnaJ similarity region at the C-terminus (amino acids 391–504) and the tetratricopeptide repeat 6 (TPR6) domain (amino acids 222–255). Variants lacking either domain fail to stimulate translation or block PKR activity in vitro.\",\n      \"method\": \"Transfection analysis with deletion mutants, in vitro PKR inhibition assays, reporter gene (SEAP) translation assays in COS-1 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — domain mutagenesis combined with in vitro PKR assay and cell-based translation reporter, multiple orthogonal methods in single focused study\",\n      \"pmids\": [\"8910500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"P58(IPK) suppresses PKR-dependent eIF2α phosphorylation and NF-κB activation induced by dsRNA, protecting cells from dsRNA-induced apoptosis via a mechanism requiring the TPR6 domain (PKR-binding). Additionally, P58(IPK) suppresses TNF-α-induced apoptosis independently of its PKR-inhibitory function, indicating a broader antiapoptotic role.\",\n      \"method\": \"Stable NIH 3T3 cell lines expressing wild-type or ΔTPR6 P58(IPK); treatment with dsRNA or TNF-α; measurement of eIF2α phosphorylation, NF-κB activation, and apoptosis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO/mutant cell lines with multiple mechanistic readouts (eIF2α phosphorylation, NF-κB, apoptosis), domain-specific dissection\",\n      \"pmids\": [\"10373525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"P58(IPK) inhibition of PKR kinase activity and stimulation of mRNA translation does not require classical J-domain function (HPD motif). HPD point mutations abolish J-domain ATPase-stimulatory activity toward Hsp70 but do not prevent PKR inhibition or support of mRNA translation in mammalian cells. However, the P58(IPK) J domain can substitute functionally for J domains of bacterial DnaJ and yeast Ydj1 in growth rescue assays.\",\n      \"method\": \"Site-directed mutagenesis of HPD motif; yeast and E. coli J-domain functional rescue assays; Hsc70 ATPase activity assay; mammalian cell translation assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro ATPase assay plus mutagenesis plus cell-based translation assays across multiple organisms; multiple orthogonal methods\",\n      \"pmids\": [\"11939789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"P58(IPK) is transcriptionally induced during ER stress via an ER stress-response element (ERSE) in its promoter. P58(IPK) interacts with and inhibits the ER-localized eIF2α kinase PERK. Overexpression of P58(IPK) reduces eIF2α phosphorylation during ER stress, while P58(IPK)-mutant cells show elevated eIF2α phosphorylation and increased BiP and CHOP expression, consistent with prolonged PERK signaling.\",\n      \"method\": \"ERSE promoter reporter assay; co-immunoprecipitation of P58(IPK) with PERK; Western blot for p-eIF2α in overexpressing and mutant cells; gene expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ERSE reporter, loss-of-function and gain-of-function with defined molecular readouts in a single focused study\",\n      \"pmids\": [\"12446838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"P52(rIPK) interacts with P58(IPK) through its 114-amino-acid charged domain binding specifically to TPR domain 7 of P58(IPK), the domain adjacent to the TPR motif required for PKR interaction. This interaction inhibits P58(IPK) function and its regulation of PKR activity, eIF2α phosphorylation, and cell growth. P52(rIPK) and P58(IPK) form a stable intracellular complex during acute cytoplasmic stress.\",\n      \"method\": \"Domain mapping with deletion constructs; in vitro binding assays; co-immunoprecipitation; cell growth and eIF2α phosphorylation assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-level mapping, reciprocal binding assays, and functional cell-based readouts across multiple conditions\",\n      \"pmids\": [\"12269832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"P58(IPK) is induced during ER stress and functions as a negative feedback inhibitor of the PERK–eIF2α–ATF4 pathway. Overexpression of P58(IPK) inhibits eIF2α phosphorylation and reduces ATF4 and Gadd153 accumulation; silencing P58(IPK) enhances eIF2α phosphorylation and increases ATF4 and Gadd153. Induction of P58(IPK) during ER stress is mediated via ATF6.\",\n      \"method\": \"Microarray analysis; overexpression and siRNA knockdown of P58(IPK); Western blot for p-eIF2α, ATF4, Gadd153\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function with defined molecular readouts; two orthogonal intervention approaches (overexpression + siRNA) replicated internally\",\n      \"pmids\": [\"12601012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"P58(IPK)/DNAJC3 associates with the ER protein translocation channel Sec61 at the cytosolic face and recruits HSP70 chaperones to that site. P58(IPK) can be crosslinked to nascent proteins entering the ER that are delayed at the translocon. Proteasome-mediated cytosolic degradation of translocating proteins delayed at Sec61 is P58(IPK)-dependent. In P58(IPK)-/- mice, cells with high secretory burden are markedly impaired in coping with ER stress.\",\n      \"method\": \"Co-immunoprecipitation with Sec61; HSP70 recruitment assay; crosslinking of nascent polypeptides; proteasome inhibitor experiments; P58(IPK)-/- mouse model\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — crosslinking, reciprocal Co-IP, in vivo KO model with secretory cell phenotype, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"16923392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"P58(IPK) resides in the ER lumen in association with BiP. ER lumenal P58(IPK) can be co-immunoprecipitated with newly synthesized secretory proteins in vitro and stimulates protein maturation upon overexpression. The stress sensitivity of p58-/- cells is due to impaired protein processing capacity in the ER lumen, not to a defect in the preemptive quality control (pQC) cytosolic pathway or elevated ER substrate burden.\",\n      \"method\": \"Subcellular fractionation; co-immunoprecipitation with BiP and nascent secretory protein; overexpression in cells; stress assays in p58-/- cells; in vitro translation/translocation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — fractionation establishing ER luminal localization, Co-IP with BiP and client, in vitro and cell-based functional assays, KO phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"17567950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"P58(IPK) regulates influenza virus mRNA translation through a PKR-mediated mechanism independent of PERK. In P58(IPK)-/- mouse embryo fibroblasts, eIF2α phosphorylation increases and influenza virus mRNA translation decreases. Loss of PKR reverses these trends. Loss of PERK has minimal effect on influenza virus mRNA translation despite reduced eIF2α phosphorylation.\",\n      \"method\": \"P58(IPK)-/-, PKR-/-, and PERK-/- mouse embryo fibroblasts; metabolic labeling of viral protein synthesis; eIF2α phosphorylation assays; viral replication assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using multiple KO cell lines with defined molecular and viral replication readouts; orthogonal KO comparisons\",\n      \"pmids\": [\"17166899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Deletion of P58(IPK) in mice results in gradual onset of glucosuria, hyperglycemia, and increasing apoptosis of pancreatic islet beta cells. Surviving beta cells are functionally intact, but the loss of P58(IPK) alters expression of apoptosis-associated genes in islets, implicating P58(IPK) as a negative feedback regulator of ER stress-associated apoptosis in secretory cells.\",\n      \"method\": \"P58(IPK)-null mouse generation; glucose and insulin measurements; histopathology; TUNEL apoptosis assay; gene expression arrays in islets\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with islet-specific histological and functional phenotype, replicated in multiple tissues; gene expression profiling as supporting evidence\",\n      \"pmids\": [\"15793246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure of the P58(IPK) TPR fragment determined to 2.5 Å resolution reveals three domains (I–III), each containing three TPR motifs. A conserved hydrophobic patch in domain I is required for binding misfolded proteins (luciferase, rhodanese). Structure-based mutagenesis of these hydrophobic residues significantly reduces P58(IPK) molecular chaperone activity.\",\n      \"method\": \"X-ray crystallography (SAD phasing, 2.5 Å); ELISA-based chaperone binding assay with luciferase and rhodanese; structure-based site-directed mutagenesis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis and in vitro chaperone activity assay; multiple orthogonal methods in a single focused study\",\n      \"pmids\": [\"20184891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of human P58(IPK) determined to 3.0 Å resolution shows a highly elongated monomer containing nine N-terminal TPR motifs in three subdomains and a C-terminal J domain attached via a flexible linker. The conserved HPD motif of the J domain is located ~100 Å from the putative misfolded protein-binding site in subdomain I, suggesting that P58(IPK) simultaneously engages substrate and BiP at spatially separated sites.\",\n      \"method\": \"X-ray crystallography (molecular replacement + SAD, 3.0 Å resolution)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of human protein with structural interpretation; single study but structure is inherently high-tier evidence\",\n      \"pmids\": [\"21799829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"P58(IPK) is identified as an interacting partner of the Influenza A virus nucleoprotein (NP)–Hsp40 complex. During IAV infection, expression of NP coincides with dissociation of P58(IPK) from Hsp40 and decreased PKR phosphorylation. Plasmid-based NP expression alone reduces PKR phosphorylation; inhibiting NP expression activates PKR and eIF2α phosphorylation, reduces viral replication, and increases IFN-β production. NP is thus the viral factor activating P58(IPK)-mediated PKR inhibition.\",\n      \"method\": \"Yeast two-hybrid screen; co-immunoprecipitation from mammalian cells; co-localization by immunofluorescence; siRNA knockdown of NP; Western blot for PKR, p-PKR, p-eIF2α\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid confirmed by reciprocal Co-IP in mammalian cells plus functional siRNA knockdown with defined PKR and viral replication readouts\",\n      \"pmids\": [\"21698289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GRP78va, a novel cytosolic isoform of GRP78, interacts with and antagonizes the PERK inhibitor P58(IPK), providing a negative regulatory mechanism on P58(IPK)'s ability to suppress PERK signaling in leukemic cells.\",\n      \"method\": \"siRNA-specific knockdown of GRP78va; co-immunoprecipitation of GRP78va with P58(IPK); PERK signaling assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP demonstrating interaction and siRNA functional data, but single lab, single paper with one primary binding method\",\n      \"pmids\": [\"19718440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MK2 and MK3 (MAP kinase-activated protein kinases) interact with p88(rIPK), recruiting a tetrameric complex containing p88(rIPK), P58(IPK), and PKR, resulting in PKR inhibition during influenza A virus infection.\",\n      \"method\": \"Co-immunoprecipitation; MK2/MK3 KO cells and siRNA knockdown; viral replication and PKR phosphorylation assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of complex formation combined with KO cell and siRNA functional data; two orthogonal intervention approaches\",\n      \"pmids\": [\"20484669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Influenza M2 protein (both A/M2 and BM2) interacts with Hsp40 and with P58(IPK) in vitro and in vivo. Formation of a stable M2–Hsp40–P58(IPK) complex enhances PKR autophosphorylation, in contrast to the inhibitory role of P58(IPK) in the absence of M2, suggesting M2 modulates the Hsp40–P58(IPK)–PKR regulatory axis.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; GST pull-down; PKR autophosphorylation assay\",\n      \"journal\": \"Protein & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP and GST pull-down with functional PKR phosphorylation assay; single lab\",\n      \"pmids\": [\"21204021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"P58(IPK) suppresses NLRP3 inflammasome activation and IL-1β secretion in macrophages through inhibition of PKR. P58(IPK)-deficient macrophages show stronger PKR, NF-κB, and JNK activation; enhanced caspase-1 cleavage; and increased IL-1β maturation. A specific PKR inhibitor or P58(IPK) overexpression abolishes these changes. Co-immunoprecipitation confirmed direct binding of P58(IPK) to PKR but not to other TLR4 downstream signaling molecules.\",\n      \"method\": \"P58(IPK) KO bone marrow-derived macrophages; PKR inhibitor treatment; P58(IPK) overexpression; co-immunoprecipitation; caspase-1 cleavage, IL-1β ELISA\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO macrophages with rescue experiments (inhibitor and OE), reciprocal Co-IP for direct binding, multiple orthogonal mechanistic readouts\",\n      \"pmids\": [\"27113095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"P58(IPK) selectively attenuates the PERK–CHOP arm of the UPR during glucose shortage associated with malignant progression, enabling cells to overcome ER stress-induced apoptosis and benefit from chronic UPR protective features. Deletion of CHOP in a K-ras(G12V) lung cancer mouse model increases tumor incidence, confirming ER stress as a barrier to malignancy that p58(IPK) helps overcome.\",\n      \"method\": \"Genetic deletion of CHOP in K-ras(G12V) mouse lung cancer model; p58(IPK) expression manipulation; UPR pathway analysis; glucose flux experiments (hexosamine pathway)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model (CHOP KO in cancer) combined with UPR pathway epistasis and p58(IPK) functional manipulation; multiple orthogonal approaches\",\n      \"pmids\": [\"23395000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In P58(IPK)-/- mice, beta cells develop oxidative stress and apoptosis via ER stress. Deletion of CHOP, treatment with a chemical chaperone, or dietary antioxidant supplementation restores beta-cell function and corrects abnormal MafA localization, placing oxidative stress as an essential proximal signal downstream of P58(IPK) loss required for ER-stress-induced apoptosis.\",\n      \"method\": \"P58(IPK)-/- mice; CHOP deletion rescue; chemical chaperone treatment; antioxidant diet; beta-cell function and mass measurements; MafA immunofluorescence\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological rescue approaches in vivo, pathway epistasis (CHOP deletion rescue), clean KO phenotype\",\n      \"pmids\": [\"25795214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of DNAJC3/p58(IPK) (a co-chaperone promoting ATP hydrolysis by BiP) in Sil1-/- mice ameliorates ER stress and neurodegeneration in Purkinje cells, revealing that alterations in the nucleotide exchange cycle of BiP cause ER stress and that reducing ATPase cycling via p58(IPK) loss can rescue neurodegeneration.\",\n      \"method\": \"Genetic epistasis: Sil1-/- crossed with Dnajc3-/- mice; assessment of ER stress markers, ubiquitylated inclusions, and Purkinje cell degeneration\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo (double KO) with histological and molecular phenotypic readouts; independently validates DNAJC3's co-chaperone function on BiP\",\n      \"pmids\": [\"19801575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"P58(IPK) specifically co-immunoprecipitates with misfolded (Akita) proinsulin but not with wild-type proinsulin in pancreatic beta cells, indicating P58(IPK) selectively associates with misfolded client proteins in the ER.\",\n      \"method\": \"Co-immunoprecipitation of FLAG-tagged wild-type and Akita proinsulin with endogenous chaperones; mass spectrometry identification; confirmed in two beta cell lines (MIN6 and βTC-6)\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP confirmed in two independent cell lines; selectivity for misfolded substrate established, but no mutagenesis or in vitro reconstitution\",\n      \"pmids\": [\"26947243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"BiP assembles in complexes with the cochaperone p58(IPK) (along with GRP170, ERdj3, PDIA1, PDIA6) that specifically bind nonnative proinsulin. p58(IPK) is required for productive proinsulin folding, as demonstrated by a genetically engineered mouse enabling pulldown of endogenous BiP complexes; nonstoichiometric BiP excess without p58(IPK) hinders proinsulin folding.\",\n      \"method\": \"Endogenous BiP complex pulldown from islet beta cells using genetically engineered mouse; co-immunoprecipitation; proinsulin folding assays with and without p58(IPK)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endogenous complex pulldown from physiologically relevant tissue (islet beta cells) combined with functional proinsulin folding assays; multiple cochaperone partners identified\",\n      \"pmids\": [\"42224595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Synthetic embryonic lethality results from combined deletion of p58(IPK) and ATF6α, demonstrating that the UPR can compensate for genetic impairment of ER protein folding (via p58(IPK)) during normal development, and that p58(IPK) has a required role in embryonic development when ATF6α is absent.\",\n      \"method\": \"Double-KO mouse (Atf6α-/- × p58(IPK)-/-); embryonic viability analysis; tissue histology\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis (double KO) with defined developmental phenotype; single lab, limited mechanistic follow-up beyond viability\",\n      \"pmids\": [\"24275136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human P58(IPK) gene (PRKRI) was mapped by fluorescence in situ hybridization to chromosome 13q32.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromosomal localization by FISH; single study, single method, but definitive genomic mapping\",\n      \"pmids\": [\"8824808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"P58(IPK) promotes the co-translocational degradation pathway for ER-targeted polypeptides with unstructured domains. Overexpression of p58(IPK) promotes co-translocational/preemptive quality control degradation of ER-targeted unstructured polypeptides via the proteasome, particularly targeting N-terminally unstructured domains.\",\n      \"method\": \"Overexpression of p58(IPK) in cells expressing ER-targeted reporter polypeptides with varying secondary structure; proteasome inhibitor assays; translocation efficiency measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based overexpression with defined substrate reporters and proteasome inhibitor validation; single lab, partially replicates earlier Cell paper findings\",\n      \"pmids\": [\"19561072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dnajc3 modulates axon regeneration in mouse retinal ganglion cells. Knockdown of Dnajc3 in a high-regenerative BXD strain reduces axon regeneration after optic nerve crush, while overexpression of Dnajc3 in a low-regenerative strain increases the number and distance of regenerating axons.\",\n      \"method\": \"Forward genetics in BXD recombinant mouse strains; AAV-mediated overexpression and shRNA knockdown; optic nerve crush model; cholera toxin B axon tracing\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint; gain- and loss-of-function in vivo but no molecular mechanism linking Dnajc3 to axon regeneration established; single lab, no peer review\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DNAJC3/P58(IPK) is an ER-resident DnaJ co-chaperone containing nine TPR motifs (organized in three subdomains) and a C-terminal J domain, which under ER stress is transcriptionally induced (via XBP-1/ATF6) and functions in the ER lumen in association with BiP/Hsp70 to promote folding and proteasomal degradation of misfolded client proteins at the Sec61 translocon; it also inhibits the eIF2α kinases PKR (in the cytoplasm, via its TPR6 domain, regulated by dissociation from Hsp40) and PERK (in the ER), thereby acting as a negative feedback attenuator of eIF2α phosphorylation and translational repression during the later phases of the unfolded protein response, with loss of function causing beta-cell apoptosis, diabetes, neurodegeneration, and inflammasome hyperactivation through unrestrained PKR/PERK–eIF2α–CHOP signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJC3/P58(IPK) is a DnaJ co-chaperone that operates at the interface of protein folding and translational control during the unfolded protein response, acting as a negative-feedback regulator that protects secretory cells from ER-stress-induced apoptosis [#6, #10]. As a J-domain co-chaperone, it stimulates the ATPase activity of Hsp70/Hsc70 [#0] and, in the ER lumen, associates with BiP to drive productive folding of secretory clients, including selective engagement of misfolded proinsulin [#8, #22]. Structurally it is an elongated monomer of nine TPR motifs arranged in three subdomains plus a C-terminal J domain, with a conserved hydrophobic patch in TPR subdomain I that binds misfolded substrates positioned ~100 Å from the J-domain HPD motif, allowing simultaneous engagement of client and BiP [#11, #12]. At the Sec61 translocon it recruits HSP70 to the cytosolic face and directs proteasomal co-translocational degradation of polypeptides delayed during import [#7, #25]. In parallel, P58(IPK) is transcriptionally induced during ER stress through ERSE/ATF6 and attenuates eIF2α phosphorylation by binding and inhibiting the eIF2α kinases PERK in the ER and PKR in the cytoplasm, the latter through its TPR6 domain and independently of classical J-domain activity [#4, #6, #1, #3]. This dampening of PERK–eIF2α–CHOP signaling limits oxidative stress and apoptosis, and its loss in mice causes beta-cell apoptosis and diabetes that is rescued by CHOP deletion or antioxidants [#10, #19]. Through PKR inhibition P58(IPK) also restrains dsRNA-induced apoptosis and NLRP3 inflammasome/IL-1β activation, and is co-opted by influenza nucleoprotein to suppress antiviral PKR signaling [#2, #17, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established which protein domains are necessary for P58(IPK) to inhibit the antiviral kinase PKR and stimulate translation, mapping function to discrete modules before the protein's chaperone identity was known.\",\n      \"evidence\": \"Deletion mutagenesis with in vitro PKR assays and a SEAP translation reporter in COS-1 cells\",\n      \"pmids\": [\"8910500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how TPR6 contacts PKR structurally\", \"Did not address ER or chaperone functions\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined P58(IPK) as a regulated co-chaperone whose PKR-inhibitory activity is switched on by dissociation from Hsp40, linking its activation to viral infection.\",\n      \"evidence\": \"Co-IP, ATPase activity assays, and dissociation experiments in influenza-infected cells\",\n      \"pmids\": [\"9920933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the Hsp40-controlled inactive complex not structurally resolved\", \"Viral trigger for dissociation not yet identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed P58(IPK) protects cells from apoptosis through both PKR-dependent (dsRNA/eIF2α/NF-κB) and PKR-independent (TNF-α) routes, broadening its role beyond translational control.\",\n      \"evidence\": \"Wild-type vs ΔTPR6 stable NIH 3T3 lines with eIF2α, NF-κB, and apoptosis readouts\",\n      \"pmids\": [\"10373525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKR-independent antiapoptotic mechanism not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Separated P58(IPK)'s translational/PKR functions from canonical J-domain chaperone activity, showing the HPD motif is dispensable for PKR inhibition yet functionally interchangeable with bacterial/yeast J domains.\",\n      \"evidence\": \"HPD point mutagenesis, cross-species J-domain rescue, Hsc70 ATPase and mammalian translation assays\",\n      \"pmids\": [\"11939789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a functional J domain is used physiologically when not required for PKR inhibition\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified P58(IPK) as an ER-stress-induced PERK inhibitor, extending its kinase-attenuating role from the cytoplasm to the ER UPR.\",\n      \"evidence\": \"ERSE reporter, PERK Co-IP, and p-eIF2α/BiP/CHOP readouts in overexpressing and mutant cells\",\n      \"pmids\": [\"12446838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct kinase-domain contacts with PERK not mapped\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed negative regulation of P58(IPK) itself via P52(rIPK) binding to TPR7, defining an inhibitory layer adjacent to the PKR-binding TPR motif.\",\n      \"evidence\": \"Domain-mapped binding assays, Co-IP, and eIF2α/cell-growth readouts\",\n      \"pmids\": [\"12269832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions controlling P52(rIPK) engagement unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Placed P58(IPK) as an ATF6-induced negative-feedback inhibitor of the PERK–eIF2α–ATF4 axis, defining its position in the late UPR.\",\n      \"evidence\": \"Microarray, overexpression and siRNA knockdown with p-eIF2α/ATF4/Gadd153 readouts\",\n      \"pmids\": [\"12601012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Timing/kinetics of feedback relative to other UPR arms not quantified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated in vivo that P58(IPK) loss drives beta-cell apoptosis and diabetes, establishing its physiological role as a feedback brake on ER-stress apoptosis in secretory cells.\",\n      \"evidence\": \"P58(IPK)-null mice with glucose/insulin measures, histopathology, TUNEL, and islet expression arrays\",\n      \"pmids\": [\"15793246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not pinpoint which downstream signal (PERK vs PKR) causes the apoptosis\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Localized P58(IPK) action to the Sec61 translocon, where it recruits HSP70 and directs proteasomal degradation of stalled translocating proteins, defining a quality-control function distinct from kinase inhibition.\",\n      \"evidence\": \"Sec61 Co-IP, HSP70 recruitment, nascent-chain crosslinking, proteasome inhibitors, and P58(IPK)-/- mice\",\n      \"pmids\": [\"16923392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of translocon vs luminal pools to physiology unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Used genetic epistasis to show P58(IPK) regulates influenza translation specifically through PKR, not PERK, distinguishing its two kinase targets.\",\n      \"evidence\": \"P58(IPK)-/-, PKR-/-, PERK-/- MEFs with viral protein labeling and eIF2α assays\",\n      \"pmids\": [\"17166899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context determining PKR vs PERK preference not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the apparent topological paradox by demonstrating an ER-lumenal P58(IPK) pool bound to BiP that promotes secretory-protein maturation, identifying luminal folding capacity as the basis of stress sensitivity in knockouts.\",\n      \"evidence\": \"Fractionation, Co-IP with BiP and nascent secretory client, overexpression and in vitro translocation assays in p58-/- cells\",\n      \"pmids\": [\"17567950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism partitioning P58(IPK) between cytosol and ER lumen unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked P58(IPK) overexpression to co-translocational/preemptive proteasomal degradation of unstructured ER-targeted polypeptides, refining its quality-control specificity.\",\n      \"evidence\": \"ER-targeted reporters of varying structure with proteasome inhibitors and translocation measures\",\n      \"pmids\": [\"19561072\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relies on overexpression; endogenous contribution not established\", \"Substrate-selection rules for unstructured domains unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified GRP78va as an antagonist of P58(IPK)'s PERK inhibition, adding a regulatory node in leukemic cells.\",\n      \"evidence\": \"GRP78va siRNA knockdown, Co-IP with P58(IPK), and PERK signaling assays\",\n      \"pmids\": [\"19718440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single primary binding method without reciprocal validation\", \"Generality beyond leukemic context untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided genetic proof of P58(IPK)'s co-chaperone action on BiP's nucleotide cycle, showing that removing P58(IPK) rescues Sil1-loss neurodegeneration.\",\n      \"evidence\": \"Sil1-/- × Dnajc3-/- double-KO mice with ER-stress and Purkinje cell readouts\",\n      \"pmids\": [\"19801575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative effect of P58(IPK) on BiP ATPase cycle in vivo not measured\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the atomic architecture of the TPR region and the hydrophobic patch in subdomain I needed for misfolded-protein binding, giving a structural basis for chaperone activity.\",\n      \"evidence\": \"2.5 Å crystal structure with ELISA chaperone assays and structure-based mutagenesis\",\n      \"pmids\": [\"20184891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate-bound structure not determined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed influenza co-opts P58(IPK) through accessory factors—MK2/MK3-recruited complexes and M2 protein—to modulate PKR, revealing virus-specific tuning of the axis.\",\n      \"evidence\": \"Co-IP, MK2/MK3 KO and siRNA, Y2H, GST pulldown, and PKR phosphorylation assays\",\n      \"pmids\": [\"20484669\", \"21204021\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposite effects of complexes (inhibition vs activation) not mechanistically reconciled\", \"Single-lab findings\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Determined the full elongated human P58(IPK) structure, positioning the J-domain HPD ~100 Å from the substrate site to argue for simultaneous client and BiP engagement.\",\n      \"evidence\": \"3.0 Å crystal structure of human protein\",\n      \"pmids\": [\"21799829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-structure with BiP or substrate to confirm the dual-engagement model\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified influenza nucleoprotein as the viral factor that activates P58(IPK)-mediated PKR inhibition by dissociating it from Hsp40.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, co-localization, and NP siRNA with PKR/IFN-β readouts\",\n      \"pmids\": [\"21698289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of NP-induced Hsp40 dissociation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed P58(IPK) attenuates the PERK–CHOP arm to let tumor cells survive glucose-limited ER stress, framing it as a barrier-overcoming factor in malignancy.\",\n      \"evidence\": \"CHOP deletion in K-ras(G12V) lung cancer mice with UPR/glucose-flux analysis\",\n      \"pmids\": [\"23395000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct requirement of P58(IPK) for tumorigenesis not isolated from CHOP genetics\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated synthetic embryonic lethality of p58(IPK) with ATF6α, showing the UPR compensates for impaired ER folding during development.\",\n      \"evidence\": \"Atf6α-/- × p58(IPK)-/- double-KO embryonic viability and histology\",\n      \"pmids\": [\"24275136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis of lethality beyond viability not pursued\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed oxidative stress as a proximal apoptotic signal downstream of P58(IPK) loss in beta cells, with CHOP deletion, chemical chaperone, or antioxidants restoring function.\",\n      \"evidence\": \"P58(IPK)-/- mice with CHOP-deletion and pharmacological rescues, beta-cell and MafA readouts\",\n      \"pmids\": [\"25795214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of oxidative stress downstream of ER stress not pinpointed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected P58(IPK) to innate immunity by showing it restrains NLRP3 inflammasome and IL-1β through direct PKR binding in macrophages.\",\n      \"evidence\": \"P58(IPK) KO BMDMs with PKR inhibitor/overexpression rescue, Co-IP, caspase-1 and IL-1β readouts\",\n      \"pmids\": [\"27113095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ER-localized vs cytosolic P58(IPK) mediates inflammasome control unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established substrate selectivity by showing P58(IPK) binds misfolded Akita proinsulin but not wild-type, supporting recognition of nonnative clients.\",\n      \"evidence\": \"Reciprocal Co-IP of WT vs Akita proinsulin in two beta-cell lines with MS identification\",\n      \"pmids\": [\"26947243\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mutagenesis or reconstitution to define the recognition determinant\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Demonstrated P58(IPK) is a required component of endogenous BiP folding complexes for productive proinsulin folding, integrating its co-chaperone role into native tissue physiology.\",\n      \"evidence\": \"Endogenous BiP complex pulldown from islet beta cells via engineered mouse with proinsulin folding assays\",\n      \"pmids\": [\"42224595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and order of cochaperone assembly on BiP not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How P58(IPK) is partitioned and switched between its cytosolic kinase-inhibitory, translocon-associated, and ER-luminal folding functions—and how these are coordinated in human disease—remains unresolved.\",\n      \"evidence\": \"No single study in the corpus integrates the multiple subcellular pools and activities into one regulatory mechanism\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of P58(IPK)–PKR or P58(IPK)–PERK complexes\", \"Determinants of cytosol/ER partitioning unknown\", \"No timeline evidence of a human Mendelian disease mutation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [8, 11, 22]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 4, 6, 17]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 7, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 7, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 6, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 8, 22]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 13, 17]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 19]}\n    ],\n    \"complexes\": [\n      \"BiP/Hsp70 ER folding complex\",\n      \"Sec61 translocon-associated complex\",\n      \"P58(IPK)-Hsp40-Hsc70 co-chaperone complex\"\n    ],\n    \"partners\": [\n      \"HSPA8\",\n      \"DNAJB1\",\n      \"EIF2AK2\",\n      \"EIF2AK3\",\n      \"HSPA5\",\n      \"SEC61\",\n      \"PRKRIR\",\n      \"HYOU1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}