RapZ -- RNase E
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB35302 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR3650500.fastq.gz | Fastqsanger.gz | |||
| ERR3650510.fastq.gz | Fastqsanger.gz | |||
| ERR3650501.fastq.gz | Fastqsanger.gz | |||
| ERR3650511.fastq.gz | Fastqsanger.gz | |||
| ERR3650502.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 18 |
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Project description:Understanding RNA processing and turnover requires knowledge of cleavages by major endoribonucleases within a living cell. We have employed TIER-Seq (transiently inactivating an endoribonuclease followed by RNA-Seq) to profile cleavage products of the essential endoribonuclease RNase E in Salmonella enterica. A dominating cleavage signature is the location of a uridine two nucleotides downstream in a single-stranded segment, which we rationalize structurally as a key recognition determinant that may favor RNase E catalysis. Our results suggest a prominent biogenesis pathway for bacterial regulatory small RNAs, whereby RNase E acts together with the RNA chaperone Hfq to liberate stable 3’-fragments from various precursor RNAs. Recapitulating this process in vitro, Hfq guides RNase E cleavage of a representative small RNA precursor for interaction with a mRNA target. In vivo, the processing is required for target regulation. Our findings reveal a general maturation mechanism for a major class of post- transcriptional regulators.
2016-12-14 | GSE81869 | GEO
Project description:RNase L is a regulated endoribonuclease in higher vertebrates that functions in antiviral innate immunity. Interferons induce OAS enzymes that sense double-stranded RNA of viral origin leading to synthesis of 2’,5’-oligoadenylate (2-5A) activators of RNase L. However, it is unknown precisely how RNase L modulates host transcriptome through its endoribonuclease activity. To isolate effects of RNase L from other effects of double-stranded RNA or virus, 2-5A was directly introduced into cells. Here we report that RNase L activation by 2-5A causes a ribotoxic stress response that requires the ribosome-associated MAP3K, ZAK. Subsequently, the stress-activated protein kinases (SAPK) JNK and p38 are phosphorylated. RNase L activation profoundly altered the transcriptome by widespread depletion of mRNAs associated with different cellular functions, but also by SAPK-dependent induction of inflammatory genes. Our findings show that 2-5A is a ribotoxic stressor that causes RNA damage through RNase L triggering a ZAK kinase cascade leading to proinflammatory signaling and apoptosis.
2024-03-01 | GSE253530 | GEO
Project description:tRNA-derived fragments (tRFs) have emerged as key players of immunoregulation. Some RNase A superfamily members participate in the shaping of tRFs population. By comparing wild-type and knock-out macrophage cell lines our previous work (Lu L, et al. CMLS, 2022, 79: 209) revealed that RNase 2 can selectively cleave tRNAs. Here, we confirm the in vitro protein cleavage pattern by screening synthetic tRNAs, single-mutant variants and anticodon-loop DNA/RNA hairpins. By sequencing the tRFs products, we identified the cleavage selectivity by recombinant RNase 2 with base specificity at B1 (U/C) and B2 (A) sites, consistent with a previous cellular study. Knowledge of RNase 2 specific tRFs generation might guide new therapeutic approaches for infectious and immune-related diseases.
2024-05-29 | GSE250347 | GEO
Project description:RNase Y is an essential endoribonuclease affecting global mRNA stability in Bacillus subtilis. We used high-resolution tiling arrays to analyze the effect of RNase Y depletion on RNA abundance covering the entire genome. The data confirm that this endoribonuclease plays a key role in initiating the decay of a large number of mRNAs as well as non coding RNAs. Comparison of the data with that of two other recent studies revealed very significant differences. About two thirds of the mRNAs upregulated following RNase Y depletion were different when compared to either one of these studies and only about 10% of were in common in all three studies.Our data confirmed already known RNase Y substrates and due to the precision and reproducibility of the profiles allows an exceptionally detailed view of the turnover of hundreds of new RNA substrates.
2013-01-15 | GSE38897 | GEO
Project description:During mammalian cell growth and differentiation, the unfolded protein response (UPR) homeostatically adjusts endoplasmic reticulum (ER) protein-folding capacity to match changing cellular secretory demands. However, under high/chronic ER stress conditions the UPR triggers apoptosis. This dichotomy is promoted in part by differential activation levels of the ER transmembrane kinase/endoribonuclease (RNase) IRE1a. IRE1a kinase auto-phosphorylation operates as a rheostat to control downstream RNase-induced outputs that either sustain adaptive ER protein-folding or cause apoptosis. We have previously shown that IRE1a’s RNase activity can be activated or fully inactivated by ATP-competitive kinase inhibitors. Here we developed a new class of ATP-competitive kinase inhibitors that partially antagonize the RNase of IRE1a at full occupancy. An atomic level resolution co-crystal structure shows that these small molecule partial antagonists—which we named ‘PAIR’s for (Partial Antagonists of IRE1a RNase)—occupy the ATP-binding site of IRE1a and partially displace a helix (helix aC) in the kinase domain that forms part of a dimeric interface. In insulin-producing beta cells, PAIRs permit adaptive XBP1 mRNA splicing, while quelling destructive/terminal outputs from extra-XBP1 mRNA endonucleolytic decay, thus preventing apoptosis. Preservation of XBP1 splicing by PAIRs permits B lymphocytes to differentiate into immunoglobulin-producing plasma cells. In summary, we propose that an intermediate RNase-inhibitory “sweet spot,” achieved by PAIR-bound IRE1a, may capture a structural conformation naturally available to IRE1a that could represent a desirable therapeutic state for drugging this master UPR sensor/effector.
2021-06-01 | GSE164496 | GEO
Project description:Many bacteria and archaea use CRISPR-Cas systems, which provide RNA-based, adaptive, and inheritable immune defenses against invading viruses and other foreign genetic elements. The proper processing of CRISPR guide RNAs (crRNAs) is a crucial step in the maturation of the defense complexes and is frequently performed by specialized ribonucleases encoded by cas genes. However, some systems employ enzymes associated with degradosome or housekeeping functions, such as RNase III or the endoribonuclease RNase E. Here, the endo- and 5´-exoribonuclease RNase J was identified as additional enzyme involved in crRNA maturation, acting jointly with RNase E in the crRNA maturation of a type III-Bv CRISPR-Cas system, and possibly together with a further RNase. Co-IP experiments revealed a small set of proteins that were co-enriched with RNase J, among them PNPase. Despite a measured, strong 3’ exonucleolytic activity of the recombinant enzyme, PNPase was not confirmed to contribute to crRNA maturation. However, the co-IP results indicate that PNPase is a component of the cyanobacterial degradosome that can recruit either RNase E or RNase J, together with additional enriched proteins.
2025-10-06 | PXD060866 | Pride
Project description:RNA degradation is an essential process that allows bacteria to regulate gene expression and has emerged as an important mechanism for controlling virulence. However, the individual contributions of RNases in this process are mostly unknown. Here, we report that of 11 tested potential RNases of the intestinal pathogen Yersinia pseudotuberculosis, two, the endoribonuclease RNase III and the exoribonuclease PNPase, repress the synthesis of the master virulence regulator LcrF. LcrF activates the expression of virulence plasmid genes encoding the type III secretion system (Ysc-T3SS) and its substrates (Yop proteins), that are employed to inhibit immune cell functions during infection. Loss of both RNases led to an increase in lcrF mRNA levels and stability. Our work indicates that PNPase exerts its influence through YopD, known to accelerate lcrF mRNA degradation. Loss of RNase III results in the downregulation of the CsrB and CsrC RNAs, leading to increased availability of active CsrA, which has previously been shown to enhance lcrF mRNA translation and stability. Other factors that influence the translation process and were found to be differentially expressed in the RNase III-deficient mutant could support this process. Transcriptomic profiling further revealed that Ysc-T3SS-mediated Yop secretion leads to global reprogramming of the Yersinia transcriptome with a massive shift of the expression from chromosomal towards virulence plasmid-encoded genes. A similar extensive transcriptional reprogramming was also observed in the RNase III-deficient mutant under non-secretion conditions. This illustrated that RNase III enables immediate coordination of virulence traits, such as Ysc-T3SS/Yops, with other functions required for host-pathogen interactions and survival in the host.
2024-01-23 | GSE249386 | GEO
Project description:RNase III is an important and highly conserved endoribonuclease known to impact rRNA, mRNA and ncRNA abundances by RNA processing. In this study we analyzed the effects of an inactivation of RNase III (inactivated through substitution of two strictly conserved amino acids within the active enzyme center) on the transcriptome of the facultative phototrophic model organism Rhodobacter sphaeroides.
2024-02-19 | GSE236804 | GEO
Project description:RNase Y is an essential endoribonuclease affecting global mRNA stability in Bacillus subtilis. We used high-resolution tiling arrays to analyze the effect of RNase Y depletion on RNA abundance covering the entire genome. The data confirm that this endoribonuclease plays a key role in initiating the decay of a large number of mRNAs as well as non coding RNAs. Comparison of the data with that of two other recent studies revealed very significant differences. About two thirds of the mRNAs upregulated following RNase Y depletion were different when compared to either one of these studies and only about 10% of were in common in all three studies.Our data confirmed already known RNase Y substrates and due to the precision and reproducibility of the profiles allows an exceptionally detailed view of the turnover of hundreds of new RNA substrates. A four arrays study of the transcriptome profiles of the B. subtilis RNase Y depletion strain SSB447 (Shahbabian et al., 2009) in which the gene rny is under the control of an IPTG inducible promoter. Rnase Y depleted cells (IPTG-) are compared to the transcript profiles of non depleted cells (IPTG+). As the rny gene is essential, depletion can only be partial. Here we carefully selected the time point for taking the sample in order to minimize growth rate effects and to obtain an highly reproducible data set.
2013-01-15 | E-GEOD-38897 | biostudies-arrayexpress
Project description:Small RNAs (sRNAs) are major regulators of gene expression in bacteria. Traditionally, sRNAs were considered mainly as regulators of translation, exerting their regulatory function by base pairing with their target mRNAs, and through this, blocking or exposing the ribosome binding site. However, accumulating evidence suggest that sRNAs not only regulate translation, but also affect the transcript stability by assisting or interfering with endoribonuclesaes. While cooperation of sRNAs with endoribonuclesaes was demonstrated for a few genes, its extent in the bacterial cell was not assessed in large scale. Here, we take advantage of large-scale RNA- seq-based approaches to study the extent of cooperation between sRNAs with the major endoribonuclease in Escherichia coli, RNase E. As a model sRNA, we use the well-known sRNA GcvB, a sRNA that regulates genes involved in amino acid metabolism and transport. To study the cooperation between GcvB and RNase E we apply the mutant cycle approach to four strains of E. coli: wt; GcvB mutant/RNase E wt; GcvB wt/RNase E mutant; GcvB mutant/RNase E mutant. By applying RNA-seq and differential gene expression analysis, we infer different modes of cooperation between RNase E and GcvB, and show that a statistically significant number of GcvB targets are downregulated by cooperation between the two regulators. Furthermore, using the TIER-seq approach to map RNase E cleavage sites transcriptome-wide and analysing them in view of GcvB binding sites, we attempt to infer the mechanisms of cooperation between the two regulators.
2024-05-12 | E-MTAB-12466 | biostudies-arrayexpress