Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20183542.fastq.gz | Fastqsanger.gz | |||
| SRR20183543.fastq.gz | Fastqsanger.gz | |||
| SRR20183544.fastq.gz | Fastqsanger.gz | |||
| SRR20183545.fastq.gz | Fastqsanger.gz | |||
| SRR20183546.fastq.gz | Fastqsanger.gz |
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Similar Datasets
Project description:PKR is an interferon induced serine/threonine protein kinase, that is activated by double stranded RNA. PKR plays an important role in the antiviral defense by interferon. In addition to its role in translation, PKR participates in several signaling pathways to transcription. The goal of this experiment is to study the role of PKR in regulating gene expression in our NIH 3T3 inducible cell line, which could overexpress PKR wt protein after the removal of tetracycline (Donze O, Dostie J, Sonenberg N. (1999) Virology 256: 322-9).
2004-01-30 | E-MEXP-50 | biostudies-arrayexpress
Project description:PKR (Protein Kinase RNA-activated) is activated by metabolic stress, such as that associated with obesity, and this activation depends on its RNA-binding domain. Here we investigated whether endogenous RNA triggers PKR activation in response to lipid exposure. Our results indicate that snoRNAs (small nucleolar RNAs) associate with PKR during metabolic stress. Our high-throughput sequence shows that snoRNAs are enriched in PKR_WT samples after palmitic acid treatment compared to mock-treated samples. MEF cells reconstituted with wild type PKR (PKR_WT) or PKR with a mutation in each dsRBM (PKR_RM) were mock- or palmitate-treated. RNAs associated with PKR were immunoprecipitated. IPed RNAs were extracted, cloned and sequenced. We performed differential expression to obtain RNAs enriched in PKRWT after palmitate treatment. We sequenced three different datasets of samples (A, B and C). Each A and B dataset contains three biological replicates. Dataset C contains a single sample.
2015-05-08 | E-GEOD-66540 | biostudies-arrayexpress
Project description:TRBP has two known functions as Dicer co-factor and PKR inhibitor. However, the role of TRBP in miRNA biogenesis is controversial and its regulation of PKR in mitosis remains unexplored. Here, we generate TRBP KO HeLa cells and find that TRBP depletion alters Dicer processing sites of a subset of miRNAs, but does not affect Dicer stability, miRNA abundance, or Argonaute loading. By generating PACT, another Dicer interactor, and TRBP/PACT double-KO cells, we further show that TRBP and PACT do not functionally compensate each other and that only TRBP contributes to Dicer processing. We also report that TRBP is hyperphosphorylated by JNK in M phase when PKR is activated by cellular dsRNAs. Hyperphosphorylation potentiates the inhibitory activity of TRBP on PKR, suppressing PKR in M-G1 transition. By generating the first human TRBP KO, our study clarifies the role of TRBP and unveils negative feedback regulation of PKR through TRBP phosphorylation. small RNAs of wild type, TRBP knockout, PACT knockout and TRBP/PACT double knockout cells were sequenced by Illumina Miseq.
2014-09-16 | E-GEOD-61458 | biostudies-arrayexpress
Project description:TRBP has two known functions as Dicer co-factor and PKR inhibitor. However, the role of TRBP in miRNA biogenesis is controversial and its regulation of PKR in mitosis remains unexplored. Here, we generate TRBP KO HeLa cells and find that TRBP depletion alters Dicer processing sites of a subset of miRNAs, but does not affect Dicer stability, miRNA abundance, or Argonaute loading. By generating PACT, another Dicer interactor, and TRBP/PACT double-KO cells, we further show that TRBP and PACT do not functionally compensate each other and that only TRBP contributes to Dicer processing. We also report that TRBP is hyperphosphorylated by JNK in M phase when PKR is activated by cellular dsRNAs. Hyperphosphorylation potentiates the inhibitory activity of TRBP on PKR, suppressing PKR in M-G1 transition. By generating the first human TRBP KO, our study clarifies the role of TRBP and unveils negative feedback regulation of PKR through TRBP phosphorylation.
2014-09-16 | GSE61458 | GEO
Project description:Protein kinase RNA-activated (PKR) induces immune response by sensing viral double-stranded RNAs (dsRNAs). However, growing evidence suggests that PKR can also be activated by endogenously expressed dsRNAs. Here, we capture these dsRNAs by formaldehyde-mediated crosslinking and immunoprecipitation-sequencing and find that various noncoding RNAs interact with PKR. Surprisingly, the majority of the PKR-interacting RNA repertoire is occupied by mitochondrial RNAs (mtRNAs). MtRNAs can form intermolecular dsRNAs owing to bidirectional transcription of mitochondrial genome and regulate PKR and eIF2α phosphorylation to control cell signaling and translation. Moreover, PKR activation by mtRNAs is counteracted by PKR phosphatases, disruption of which causes apoptosis from PKR overactivation even in uninfected cells. Our work unveils dynamic regulation of PKR even without infection and establishes PKR as a sensor for nuclear and mitochondrial signaling cues in regulating cellular metabolism.
2018-07-18 | GSE108986 | GEO
Project description:Protein kinase R (PKR) is a key antiviral kinase activated by binding double-stranded RNA (dsRNA) produced during viral replication. Upon activation, PKR phosphorylates eIF2α, leading to the inhibition of translation and viral replication. However, many viruses have evolved mechanisms to counteract PKR activity. In Cardioviruses, the Leader protein (L), a short peptide cleaved from the N-terminus of the viral polyprotein, not only inhibits PKR but also blocks interferon production and disrupts nucleocytoplasmic trafficking (NCT). L disrupts NCT by recruiting host RSK kinases to the nuclear pore complex (NPC), where RSK phosphorylates FG-nucleoporins, thereby impairing NCT. L mutations that affect NCT disruption also impact its ability to inhibit PKR, suggesting a mechanistic link. Recombinant TMEV and EMCV viruses designed to disrupt NCT through different mechanisms exhibited some extent of PKR inhibition, supporting the link between NCT disruption and PKR inhibition. Immunostaining and live-cell imaging revealed that L-induced NCT disruption redistributes a fraction of PKR to the nucleoli, where PKR remains inactive. This suggests that nucleolar sequestration contributes to PKR inhibition. Additionally, L-mediated NCT disruption leads to the release of nuclear RNA-binding proteins (nRBPs) into the cytosol, which may bind or modify viral dsRNA, further preventing PKR activation. Collectively, these results highlight nucleocytoplasmic trafficking as a critical regulatory mechanism governing PKR activation. Thus, beyond the specific action of the Cardiovirus L protein, our study reveals a broader principle in which interference with host nucleocytoplasmic transport can significantly impact the subcellular localization and functional regulation of immune effectors, such as PKR
2025-11-17 | PXD066206 | Pride
Project description:PKR (Protein Kinase RNA-activated) is activated by metabolic stress, such as that associated with obesity, and this activation depends on its RNA-binding domain. Here we investigated whether endogenous RNA triggers PKR activation in response to lipid exposure. Our results indicate that snoRNAs (small nucleolar RNAs) associate with PKR during metabolic stress. Our high-throughput sequence shows that snoRNAs are enriched in PKR_WT samples after palmitic acid treatment compared to mock-treated samples.
2015-05-08 | GSE66540 | GEO
Project description:Protein kinase R (PKR) functions both as a promoter and inhibitor in various cancers, yet its role in pancreatic ductal adenocarcinoma (PDAC) remains unclear. This study aimed to investigate the role of PKR in PDAC. PKR expression in PDAC cell lines was assessed using real-time reverse transcriptase polymerase chain reaction and western blot analysis. The MTS assay was employed to evaluate the effect of PKR on cell proliferation. To elucidate the underlying mechanisms of PKR's action on PDAC, RNA-sequencing (RNA-seq) analysis was performed, and flow cytometry was used to examine the effects of PKR knockdown on cell cycle progression and apoptosis in PDAC cells. The results indicated that PDAC cell lines exhibited significantly reduced proliferation when transfected with PKR-targeting siRNAs or treated with PKR inhibitors. RNA-seq analysis revealed a substantial upregulation of GADD45A expression upon inhibition of PKR expression. Following PKR silencing, cell cycle analysis showed a marked accumulation of cells in the G1 phase, which is consistent with GADD45A's known role as a cell cycle regulator. Furthermore, the inhibition of proliferation caused by PKR knockdown was reversed by the downregulation of GADD45A, suggesting an interactive effect between PKR and GADD45A in regulating PDAC cell growth. In conclusion, PKR promotes PDAC cell proliferation by modulating the cell cycle through the regulation of GADD45A expression. These findings suggest that PKR may serve as a potential novel therapeutic target for PDAC.
2025-07-16 | GSE285947 | GEO
Project description:Eukaryotic translation initiation factor 2 alpha kinase 2 (EIF2AK2), better known as PKR plays a key role in the response to viral infections and cellular homeostasis by regulating mRNA translation. Upon binding dsRNA, PKR is activated through homodimerization and subsequent autophosphorylation on Thr446 and Thr451 residues. In this study, we identified a novel PKR phosphorylation site, Ser6, located 3 aminoacids upstream the first double-stranded RNA binding domain (DRBM1). Another Ser residue occurs in PKR at position 97, the very same position relative to the DRBM2. Ser or Thr residues also occur 3 amino acids upstream DRBMs of other proteins such as ADAR1 or DICER. Phosphoinhibiting mutations (Ser-to-Ala) introduced at Ser6 and Ser97 spontaneously activated PKR. In contrast, phosphomimetic mutations (Ser-to-Asp) inhibited PKR activation following either poly (I:C) transfection or virus infection. These mutations moderately affected dsRNA binding, suggesting a model where negative charges occuring at position 6 and 97 tighten the interaction of DRBMs with the kinase domain, thus keeping PKR in an inactive, closed conformation even in the presence of dsRNA. This study provides new insights on PKR regulation mechanisms and identifies Ser6 and Ser97 as potential targets to modulate PKR activity for therapeutic purposes
2021-05-10 | PXD022564 | Pride