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Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing

ABSTRACT: Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing

PROVIDER: PRJNA416994 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6251540_1.fastq.gz	Fastqsanger.gz
	SRR6251540_2.fastq.gz	Fastqsanger.gz
	SRR6251550_1.fastq.gz	Fastqsanger.gz
	SRR6251550_2.fastq.gz	Fastqsanger.gz
	SRR6251541_1.fastq.gz	Fastqsanger.gz

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Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (Structure-seq)

Project description:Accurate gene expression requires the coordination of RNA processing with assembly of messenger RNA-protein (mRNP) complex. RNA helicases are a class of enzymes that unwind RNA duplexes in vitro and have been are proposed to remodel RNA structure in vivo. Herein, we provide evidence that the DEAD-box protein Dbp2 remodels RNA structure to facilitate efficient pre-mRNA processing in S. cerevisiae. First, we find that Dbp2 associates with the 3’ ends and 3’ splice-sites of mRNAs genome-wide. Using structure-seq to map RNA secondary structure, we find altered secondary structures in dbp2∆ cells that overlap polyadenylation elements and correlate with inefficient termination. We also identify a role for Dbp2 in pre-mRNA splicing and show that both splicing and termination require Dbp2 helicase activity. This reveals that DEAD-box RNA helicases unwind structure in vivo and that structural alteration of pre-mRNA is essential for proper gene expression.

2019-05-01 | GSE106478 | GEO

Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (iCLIP-seq)

2019-05-01 | GSE106477 | GEO

Ubiquitination of DEAD-box RNA helicase DDX3X by TRIM25

Project description:Tripartite motif protein 25 (TRIM25) is an E3 ligase that ubiquitinates multiple substrates within the RLR signalling cascade and plays both RING (really interesting new gene)-dependent and RING-independent roles in RIG-I-mediated IFN induction. We report that the PRY-SPRY domain of TRIM25 interacts with the N-terminal extension (NTE) of DEAD-box helicase 3X (DDX3X), a host protein with multiple roles in RLR signalling. Gene reporter assays and knockdown studies reveal DDX3X and TRIM25 cooperate to activate the IFN- promoter following RIG-I activation independent of DDX3X’s catalytic activity. We also show that TRIM25 ubiquitinates DDX3X at several lysine residues in vitro and in cells.

2021-09-08 | PXD028122 | Pride

Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (RNA Pol II ChIP-seq)

Project description:Proper formation of messenger RNA-protein complexes (mRNPs) is critical for accurate gene expression and requires temporal regulation of mRNA structures. RNA helicases are major players that control mRNP/mRNA structures throughout the life of mRNAs. Our group has shown that the DEAD-box RNA helicase Dbp2 in S. cerevisiae is a bona fide RNA helicase in vitro that is required for proper transcription termination and assembly of RNA-binding proteins onto poly(A)+ RNA in vivo. Here, we utilized multiple genome-wide approaches to identify the mRNAs and processing steps targeted by the enzymatic activity of Dbp2. We found that Dbp2 promotes efficient termination of mRNA transcription through remodeling of RNA structures at the 3’ end of mRNAs. This finding elucidates how an RNA helicase regulates gene expression by modulating RNA structures at a genome-wide scale. In addition, Dbp2 facilitates efficient splicing, for which the helicase activity of Dbp2 is required. This reveals a previously uncharacterized role of RNA helicases besides known splicing factors. Overall, our work shows that Dbp2 plays a critical role in pre-mRNA processing and how RNA structure remodeling impacts gene expression.

2019-05-01 | GSE125283 | GEO

The DEAD-box RNA helicase Ded1 is a translation-elongation factor

Project description:The DEAD-box RNA helicase Ded1 is a translation-elongation factor

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RNase R is associated in a functional complex with the RhpA DEAD-box RNA helicase in Helicobacter pylori

Project description:Ribonucleases (RNases) are central actors in post-transcriptional regulation, a major level of regulation of gene expression in all cells. This control plays an important role in the bacterial pathogen Helicobacter pylori, although only the function of RNase J was characterized so far. Here, we studied the RNase R enzyme from H. pylori, a 3’-5’ exoribonuclease whose ortholog in Escherichia coli was reported to display, in addition, helicase activity and to be able to hydrolyze RNA substrates with double stranded structures. We observed that HpRNase R protein does not carry the domains responsible for helicase activity in E. coli and accordingly that the purified protein is unable to degrade in vitro RNA molecules with secondary structures. The RNase R helicase domain loss is widespread among the Campylobacterota and occurred gradually during their evolution. Furthermore, an in vivo interaction between HpRNase R and RhpA, the sole DEAD-box RNA helicase of H. pylori, was discovered. Phylogenomics suggests that this interaction might occur in other bacteria of the phylum Campylobacterota. Purified RhpA facilitates the degradation of double stranded RNA substrates by HpRNase R, showing that this complex is functional. HpRNase R has a minor role of in 5S rRNA maturation and, as shown by RNA-Seq, few targets in H. pylori all of them being included in the RhpA regulon. In conclusion, we describe a new type of RNase R that lacks some of the features that were considered as hallmarks of RNase R proteins, but that has co-opted another RNA helicase, which we hypothesize helps it accomplish some of its functions in vivo.

2021-06-19 | E-MTAB-10045 | biostudies-arrayexpress

Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (iCLIP-seq)

Project description:Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (iCLIP-seq)

| PRJNA416997 | ENA

Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (Structure-seq)

Project description:Genome-wide Identification of DEAD-box RNA Helicase Targets Reveals Roles for RNA Secondary Structure Remodeling in mRNA Processing (Structure-seq)

| PRJNA416996 | ENA

RNase R is associated in a functional complex with the RhpA DEAD-box RNA helicase in Helicobacter pylori

Project description:Ribonucleases are central players in post-transcriptional regulation, a major level of gene expression regulation in all cells. Here, we characterized the 3’-5’ exoribonuclease RNase R from the bacterial pathogen Helicobacter pylori. The "prototypical" Escherichia coli RNase R displays both exoribonuclease and helicase activities, but whether this latter RNA unwinding function is a general feature of bacterial RNase R had not been addressed. We observed that H. pylori HpRNase R protein does not carry the domains responsible for helicase activity and accordingly the purified protein is unable to degrade in vitro RNA molecules with secondary structures. The lack of RNase R helicase domains is widespread among the Campylobacterota, that include Helicobacter and Campylobacter genera, and this loss occurred gradually during their evolution. An in vivo interaction between HpRNase R and RhpA, the sole DEAD-box RNA helicase of H. pylori was discovered. Purified RhpA facilitates the degradation of double stranded RNA by HpRNase R, showing that this complex is functional. HpRNase R has a minor role in 5S rRNA maturation and few targets in H. pylori, all included in the RhpA regulon. We concluded that during evolution, HpRNase R has co-opted the RhpA helicase to compensate for its lack of helicase activity.

2021-04-08 | PXD023837 | Pride

The DEAD box helicase RDE-12 promotes amplification of RNAi in cytoplasmic foci in C. elegans

Project description:RNA interference (RNAi) is a potent mechanism for down-regulating gene expression. Conserved RNAi pathway components are found in animals, plants, fungi and other eukaryotes. In C. elegans, the RNAi response is greatly amplified by the synthesis of abundant secondary siRNAs. Exogenous double stranded RNA is processed by Dicer and RDE-1/Argonaute into primary siRNA that guides target mRNA recognition. The RDE-10/RDE-11 complex and the RNA dependent RNA polymerase RRF-1 then engage the target mRNA for secondary siRNA synthesis. However, the molecular link between primary siRNA production and secondary siRNA synthesis remains largely unknown. Furthermore, it is unclear if the sub-cellular sites for target mRNA recognition and degradation coincide with sites where siRNA synthesis and amplification occur. In the C. elegans germline, cytoplasmic P granules at the nuclear pores and perinuclear Mutator foci contribute to target mRNA surveillance and siRNA amplification, respectively. We report that RDE-12, a conserved FG domain containing DEAD-box helicase, localizes in P-granules and cytoplasmic foci that are enriched in RSD-6 but are excluded from the Mutator foci. Our results suggest that RDE-12 promotes secondary siRNA synthesis by orchestrating the recruitment of RDE-10 and RRF-1 to primary siRNA targeted mRNA in distinct cytoplasmic compartments. Examination of exogenous dsRNA trigger derived siRNA in wildtype and rde-12 mutant animals

2014-03-27 | E-GEOD-53830 | biostudies-arrayexpress

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