Leo1 occupancy in presence of dengue virus NS5
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA433884 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6713440.fastq.gz | Fastqsanger.gz | |||
| SRR6713450.fastq.gz | Fastqsanger.gz | |||
| SRR6713431.fastq.gz | Fastqsanger.gz | |||
| SRR6713441.fastq.gz | Fastqsanger.gz | |||
| SRR6713451.fastq.gz | Fastqsanger.gz |
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Project description:We use ChIP-seq on PAF1C member Leo1 to determine how PAF1C occupancy at interferon stimulated genes is impacted by dengue virus NS5 protein.
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Project description:The goal of this study was to compare the transcriptional profile (RNA-seq) of Dengue virus 2 and mock infected cells at 24 and 36 hours post infection. Dengue virus NS5 protein plays multiple functions in the cytoplasm of infected cells, enabling viral RNA replication and counteracting host antiviral responses. Here, we demonstrate a novel function of NS5 in the nucleus where it interferes with cellular splicing. Using global proteomic analysis of infected cells together with functional studies, we found that NS5 binds spliceosome complexes and modulates endogenous splicing. In particular, we show that NS5 alone, or in the context of viral infection, interacts with core components of the U5 snRNP particle, CD2BP2 and DDX23, alters the inclusion/exclusion ratio of alternative splicing events, and changes mRNA isoform abundance of known antiviral factors. Interestingly, a genome wide transcriptome analysis, using recently developed bioinformatics tools, revealed an increase of intron retention upon dengue virus infection, and viral replication was improved by silencing specific U5 components. Different mechanistic studies indicate that binding of NS5 to the spliceosome reduces the efficiency of pre-mRNA processing, independently of NS5 enzymatic activities. We propose that NS5 binding to U5 snRNP proteins hijacks the splicing machinery resulting in a less restrictive environment for viral replication.
2016-08-09 | GSE84285 | GEO
Project description:The goal of this study was to compare the transcriptional profile (RNA-seq) of Dengue virus 2 and mock infected cells at 24 and 36 hours post infection. Dengue virus NS5 protein plays multiple functions in the cytoplasm of infected cells, enabling viral RNA replication and counteracting host antiviral responses. Here, we demonstrate a novel function of NS5 in the nucleus where it interferes with cellular splicing. Using global proteomic analysis of infected cells together with functional studies, we found that NS5 binds spliceosome complexes and modulates endogenous splicing. In particular, we show that NS5 alone, or in the context of viral infection, interacts with core components of the U5 snRNP particle, CD2BP2 and DDX23, alters the inclusion/exclusion ratio of alternative splicing events, and changes mRNA isoform abundance of known antiviral factors. Interestingly, a genome wide transcriptome analysis, using recently developed bioinformatics tools, revealed an increase of intron retention upon dengue virus infection, and viral replication was improved by silencing specific U5 components. Different mechanistic studies indicate that binding of NS5 to the spliceosome reduces the efficiency of pre-mRNA processing, independently of NS5 enzymatic activities. We propose that NS5 binding to U5 snRNP proteins hijacks the splicing machinery resulting in a less restrictive environment for viral replication. A549 cells where infected with Dengue virus 2 or mock and after 24 and 36 hours post infection mRNA was purified. Then the transcriptional profile of these cells was analyzed using RNA-seq.
2016-08-09 | E-GEOD-84285 | biostudies-arrayexpress
Project description:The project employs HDX-MS to study the conformational dynamics of DENV2 NS5 in its apo form and in complex with the viral promoter RNA, Stem Loop A (SLA). The conformational dynamics of the RdRp domain of DENV2 NS5 (NS5-RdRp) in its apo form and in complex with SLA was also studied.
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Project description:Efficient virus replication in its vector, Aedes mosquitoes, is essential for the transmission of arboviral diseases like dengue virus (DENV) in populations. In order to identify RNA-independent host factors involved in DENV replication in mosquitoes, we established a system expressing all non-structural proteins within the context of the macro protein complex as observed during viral infections. Mosquito host factors interacting with 3xFLAGED-tagged DENV non-structural proteins NS1 or NS5 proteins were identified by label-free mass spectrometry.
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Project description:Domains of heterochromatin play important roles in the maintenance and regulation of eukaryotic genomes. However, the repressive nature of heterochromatin combined with its propensity to self-propagate necessitates the existence of robust mechanisms that limit heterochromatin spreading and thereby avoid silencing of expressed genes. A number of specific sequence elements have been found to serve as barriers to heterochromatin spreading; however, the mechanisms by which spreading is curtailed are generally not well understood. Here we uncover a role for PAF complex component Leo1 in regulating heterochromatin cis-spreading. A genetic screen revealed that loss of Leo1 results in spreading of heterochromatin across a centromeric (IRC) boundary element in fission yeast. Similar heterochromatin spreading was seen upon deletion of other components of the PAF complex, but not other factors involved in transcription-coupled chromatin modification, indicating a specific role for the PAF complex in heterochromatin regulation. Loss of Leo1 is associated with reduced levels of H4K16 acetylation at the boundary, while tethering of the H4K16 acetyltransferase Mst1 to boundary chromatin suppresses heterochromatin spreading in leo1? cells, suggesting that Leo1 antagonises heterochromatin spreading by facilitating H4K16 acetylation. Interestingly, Leo1 also regulates heterochromatin spreading independently of boundaries, and loss of Leo1 causes redistribution of heterochromatin, in particular resulting in substantial expansion of telomeric heterochromatin domains. The PAF complex is known to be an important regulator of transcription-related chromatin modifications; our findings reveal a previously undescribed role for this complex in global regulation of heterochromatin spreading in cis. 8 samples: input (whole cell extract) and IP from H3K9me2 ChIP in wild-type and leo1? cells, in duplicate
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Project description:Cyclin-dependent kinase 12 (CDK12) interacts with Cyclin K to form a a functional nuclear kinase complex, which has been reported to phosphorylate the carboxyl-terminal domain (CTD) of RNA polymerase II (Pol II) for transcriptional regulation and co-transcriptional RNA processing. However, the precise mechanisms and targets of CDK12 action remain largely unknown. Here, we combined a chemical genetic screen and phosphoproteomic strategies and identified a landscape of nuclear CDK12 substrates, which included proteins that regulate transcription, chromatin organization, and RNA splicing. Next, we confirmed that the LEO1 subunit of the transcription elongation factor PAF1 complex (PAF1C) is a bona fide substrate of CDK12. Acute depletion of LEO1 reduces Pol II occupancy on the chromatin, while mutations of LEO1 phosphorylation sites to non-phosphorylatable alanine residues attenuated the association of PAF1C with elongating Pol II and chromatin, resulting in impaired processive transcription elongation. Furthermore, LEO1 C-terminus could interact with and be dephosphorylated by the Integrator-PP2A complex (INTAC), while acute depletion of INTAC in cells promotes the association between PAF1C and elongating Pol II on the chromatin. Together, this study provides a novel transcriptional regulatory mechanism that the CDK12-INTAC axis fine-tunes LEO1 phosphorylation for processive transcription elongation.
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Project description:Among the flaviviral proteins, NS5 is the largest and most conserved. NS5 contains major enzymatic components of the viral replication complex. Disruption of the common key NS5-host protein-protein interactions critical for viral replication could aid in the development of broad-spectrum anti-flaviviral therapeutics. To this end, we investigated the JEV- and ZIKV-NS5 interactomes in human cells using GFP pull-downs with mass spectrometry analysis in a label-free fashion. A total of 138 cellular proteins interacting with NS5 from JEV, ZIKV, or both were identified as Protein classification analysis of identified cellular targets revealed the enrichment of RNA binding, processing and splicing including spliceosomal and spliceosome-associated proteins in both datasets. Comparison of our data with literature not only revealed several cellular NS5 interacting proteins shared among flaviviruses, but also identified proteins that have no known function in flavivirus biology such as RNA polymerase II-associated Paf1 complex, protein phosphatase 6, and s-adenosylmethionine synthetase. Our study generates the first landscape of the JEV and ZIKV NS5 interactome in human cells and identifies cellular proteins that are potentially targetable for broad-spectrum anti-flaviviral therapy.
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