Marine metagenome
Ontology highlight
ABSTRACT:
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| DRR014055.fastq.gz | Fastqsanger.gz | |||
| DRR014056.fastq.gz | Fastqsanger.gz | |||
| DRR014057.fastq.gz | Fastqsanger.gz | |||
| DRR014058.fastq.gz | Fastqsanger.gz | |||
| DRR014059.fastq.gz | Fastqsanger.gz |
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Project description:Abstract - 18S nonfunctional rRNA decay (NRD) detects and eliminates translationally nonfunctional 18S rRNA. While this process is critical for ribosome quality control, the mechanisms underlying nonfunctional 18S rRNA turnover remain elusive, particularly in mammals. Here, we show that mammalian 18S NRD initiates through the integrated stress response (ISR) via GCN2. Nonfunctional 18S rRNA induces translational arrest at start sites. Biochemical analyses demonstrate that ISR activation limits translation initiation and attenuates collisions between scanning 43S preinitiation complexes and stalled nonfunctional ribosomes. The ISR promotes 18S NRD and 40S ribosomal protein turnover by RNF10-mediated ubiquitination. Ultimately, RIOK3 binds the resulting ubiquitinated 40S subunits and facilitates 18S rRNA decay. Overall, mammalian 18S NRD acts through GCN2, followed by ubiquitin-dependent 18S rRNA degradation involving the ubiquitin E3 ligase RNF10 and the atypical protein kinase RIOK3. These findings establish a dynamic feedback mechanism by which the GCN2-RNF10-RIOK3 axis surveils ribosome functionality at the translation initiation step.
2024-12-09 | MSV000096620 | MassIVE
Project description:18S nonfunctional rRNA decay (NRD) detects and eliminates translationally nonfunctional 18S rRNA. The underlying mechanisms associated with the detection and turnover of nonfunctional 18S rRNA remain elusive. While NRD has been identified and exclusively studied in Saccharomyces cerevisiae, it is unclear whether this quality control pathway exists in mammals. Here we demonstrate the conservation of 18S NRD in mammalian cells. Using genome-wide CRISPR genetic interaction screens, we identify two molecular events triggered by nonfunctional 18S rRNA— activation of the integrated stress response (ISR) and ubiquitination of ribosomal proteins elicited by GCN2 and RNF10, respectively. Selective ribosome profiling reveals nonfunctional 18S rRNA induces translation arrest at start sites. Biochemical analyses show that activation of the ISR limits translation initiation, attenuating collisions between scanning 43S preinitiation complexes and nonfunctional 80S ribosomes arrested at start sites. Thus, the ISR facilitates the turnover of nonfunctional 18S rRNA and 40S ribosomal proteins by RNF10-mediated ubiquitination. Altogether, these results establish a dynamic feedback mechanism by which cells finetune translation initiation to enable ribosome functionality surveillance through the GCN2-RNF10 axis.
2025-02-26 | GSE255781 | GEO
Project description:18S nonfunctional rRNA decay (NRD) detects and eliminates translationally nonfunctional 18S rRNA. The underlying mechanisms associated with the detection and turnover of nonfunctional 18S rRNA remain elusive. While NRD has been identified and exclusively studied in Saccharomyces cerevisiae, it is unclear whether this quality control pathway exists in mammals. Here we demonstrate the conservation of 18S NRD in mammalian cells. Using genome-wide CRISPR genetic interaction screens, we identify two molecular events triggered by nonfunctional 18S rRNA— activation of the integrated stress response (ISR) and ubiquitination of ribosomal proteins elicited by GCN2 and RNF10, respectively. Selective ribosome profiling reveals nonfunctional 18S rRNA induces translation arrest at start sites. Biochemical analyses show that activation of the ISR limits translation initiation, attenuating collisions between scanning 43S preinitiation complexes and nonfunctional 80S ribosomes arrested at start sites. Thus, the ISR facilitates the turnover of nonfunctional 18S rRNA and 40S ribosomal proteins by RNF10-mediated ubiquitination. Altogether, these results establish a dynamic feedback mechanism by which cells finetune translation initiation to enable ribosome functionality surveillance through the GCN2-RNF10 axis.
2025-02-26 | GSE255780 | GEO
Project description:18S nonfunctional rRNA decay (NRD) detects and eliminates translationally nonfunctional 18S rRNA. The underlying mechanisms associated with the detection and turnover of nonfunctional 18S rRNA remain elusive. While NRD has been identified and exclusively studied in Saccharomyces cerevisiae, it is unclear whether this quality control pathway exists in mammals. Here we demonstrate the conservation of 18S NRD in mammalian cells. Using genome-wide CRISPR genetic interaction screens, we identify two molecular events triggered by nonfunctional 18S rRNA— activation of the integrated stress response (ISR) and ubiquitination of ribosomal proteins elicited by GCN2 and RNF10, respectively. Selective ribosome profiling reveals nonfunctional 18S rRNA induces translation arrest at start sites. Biochemical analyses show that activation of the ISR limits translation initiation, attenuating collisions between scanning 43S preinitiation complexes and nonfunctional 80S ribosomes arrested at start sites. Thus, the ISR facilitates the turnover of nonfunctional 18S rRNA and 40S ribosomal proteins by RNF10-mediated ubiquitination. Altogether, these results establish a dynamic feedback mechanism by which cells finetune translation initiation to enable ribosome functionality surveillance through the GCN2-RNF10 axis.
2025-02-26 | GSE255779 | GEO
Project description:18S nonfunctional rRNA decay (NRD) detects and eliminates translationally nonfunctional 18S rRNA. The underlying mechanisms associated with the detection and turnover of nonfunctional 18S rRNA remain elusive. While NRD has been identified and exclusively studied in Saccharomyces cerevisiae, it is unclear whether this quality control pathway exists in mammals. Here we demonstrate the conservation of 18S NRD in mammalian cells. Using genome-wide CRISPR genetic interaction screens, we identify two molecular events triggered by nonfunctional 18S rRNA— activation of the integrated stress response (ISR) and ubiquitination of ribosomal proteins elicited by GCN2 and RNF10, respectively. Selective ribosome profiling reveals nonfunctional 18S rRNA induces translation arrest at start sites. Biochemical analyses show that activation of the ISR limits translation initiation, attenuating collisions between scanning 43S preinitiation complexes and nonfunctional 80S ribosomes arrested at start sites. Thus, the ISR facilitates the turnover of nonfunctional 18S rRNA and 40S ribosomal proteins by RNF10-mediated ubiquitination. Altogether, these results establish a dynamic feedback mechanism by which cells finetune translation initiation to enable ribosome functionality surveillance through the GCN2-RNF10 axis.
2025-02-26 | GSE255783 | GEO
Project description:18S rRNA amplicon sequencing of eukaryote communities in Lake George, ND, USA
| PRJEB33421 | ENA
Project description:18S rRNA amplicon sequencing of eukaryote communities in Lake George, ND, USA
| PRJEB33420 | ENA
Project description:Amplicon sequencing of 18S rRNA gene, eukaryote assemblages in seawater in Matsushima Bay, Japan
| PRJDB13931 | ENA
Project description:In eukaryotes, biogenesis of ribosomes requires folding and assembly of the precursor rRNA (pre-rRNA) with a large number of proteins and snoRNPs into huge RNA-protein complexes. In spite of intense genetic, biochemical and high resolution cryo-EM studies in Saccharomyces cerevisiae, information about the conformation of the earliest 35S pre-rRNA is limited. To overcome this, we performed high-throughput SHAPE chemical probing on the 35S pre-rRNA associated with 90S pre-ribosomes. We focused our analyses on external (5´ETS) and internal (ITS1) transcribed spacers as well as the 18S region. We show that in the 35S pre-rRNA, the central region of the 18S is in a more open configuration compared to 20S pre-rRNA and that the central pseudoknot is not formed. The essential ribosome biogenesis protein Mrd1 influences the structure of the 18S part locally and is involved in organizing the central pseudoknot and surrounding structures. Our results demonstrate that the U3 snoRNA dynamically interacts with the 35S pre-rRNA and that Mrd1 is required for disrupting U3 snoRNA base-pairing interactions in the 5'ETS. We propose that the dynamic U3 snoRNA interactions and Mrd1 are essential for establishing the structure of the central region of 18S that is required for processing and 40S subunit function.
2018-01-15 | GSE106868 | GEO
Project description:Ribosome biogenesis is essential for protein synthesis in gene expression. Yeast eIF5B has been shown biochemically to facilitate 18S rRNA 3’ end maturation during late-40S ribosomal subunit assembly and gate the transition from translation initiation to elongation. But the effects of eIF5B have not been studied at the genome-wide level in any organism, and 18S rRNA 3’ end maturation is poorly understood in plants. Arabidopsis HOT3/eIF5B1 was found to promote development and heat-stress acclimation by translational regulation, but its molecular function remained unknown. Here, we show that HOT3 is a late-stage ribosome biogenesis factor that facilitates 18S rRNA 3’ end processing and is a translation initiation factor that globally impacts the transition from initiation to elongation. By developing and implementing 18S-ENDseq, we revealed previously unknown events in 18S rRNA 3’ end maturation or metabolism. We quantitatively defined new processing hotspots and identified adenylation as the prevalent non-templated RNA modification at the 3’ ends of pre-18S rRNAs. Aberrant 18S rRNA maturation in hot3 further activated RNAi to generate RDR1- and DCL2/4-dependent risiRNAs mainly from a 3’ portion of 18S rRNA. We further showed that risiRNAs in hot3 were predominantly localized in ribosome-free fractions not responsible for the 18S rRNA maturation or translation initiation defects in hot3. Our study uncovered the molecular function of HOT3/eIF5B1 in 18S rRNA maturation at the late-40S assembly stage and revealed the regulatory crosstalk among ribosome biogenesis, mRNA translation initiation, and siRNA biogenesis in plants.
2023-04-19 | GSE223169 | GEO