Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Unresolved stalled ribosome complexes restrict cycle progression after genotoxic stress

ABSTRACT: Translation of damaged mRNA can lead to ribosome stalling, thereby producing incomplete proteins toxic to the cell. The mechanism of ribosome-associated quality control (RQC) disassembles stalled ribosomes through the actions of the ASC-1 complex (ASCC). Here, we show that some reagents that chemically damage RNA, such as ultraviolet light (UV), cause ribosome stalling, which leads to accumulation of the ASC-1 complex (ASCC) on stalled ribosomes and stable interaction of the ASCC3 helicase with RNA. In contrast, the ASCC was not similarly affected by emetine or anisomycin-induced ribosome stalling. Our work identified two different types of stalled ribosome. Ribosomes arrested by emetine or anisomycin are transient as they are resolved by the ASCC. Whereas the ASCC fails to split some stalled ribosomes, such as those induced by UV, resulting in long-lived stalled ribosome complexes. We show that ribosome stalling activates the G1/S and G2/M cell cycle checkpoints with long-lived stalled ribosomes causing prolonged checkpoint activation. Thus, the cell adjusts this adaptive survival response to match the nature of the stalled ribosome.

INSTRUMENT(S): Synapt MS

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Epithelial Cell, Cell Culture

SUBMITTER: Rebecca Jukes

LAB HEAD: Prof. Anne Willis

PROVIDER: PXD023878 | Pride | 2022-02-07

REPOSITORIES: Pride

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
	MS_-UV_Harry_A_260914001.mzid.gz	Mzid
	MS_-UV_Harry_A_260914001.mzid_MS_-UV_Harry_A_260914001.MGF	Mzid
	MS_-UV_Harry_A_260914001.raw.zip	Raw
	MS_-UV_Harry_A_260914002.mzid.gz	Mzid
	MS_-UV_Harry_A_260914002.mzid_MS_-UV_Harry_A_260914002.MGF	Mzid

Items per page:

1 - 5 of 252

Similar Datasets

Unresolved stalled ribosome complexes restrict cycle progression after genotoxic stress

Project description:Translation of damaged mRNA can lead to ribosome stalling, thereby producing incomplete proteins toxic to the cell. The mechanism of ribosome-associated quality control (RQC) disassembles stalled ribosomes through the actions of the ASC-1 complex (ASCC). Here, we show that some reagents that chemically damage RNA, such as ultraviolet light (UV), cause ribosome stalling, which leads to accumulation of the ASC-1 complex (ASCC) on stalled ribosomes and stable interaction of the ASCC3 helicase with RNA. In contrast, the ASCC was not similarly affected by emetine or anisomycin-induced ribosome stalling. Our work identified two different types of stalled ribosome. Ribosomes arrested by emetine or anisomycin are transient as they are resolved by the ASCC. Whereas the ASCC fails to split some stalled ribosomes, such as those induced by UV, resulting in long-lived stalled ribosome complexes. We show that ribosome stalling activates the G1/S and G2/M cell cycle checkpoints with long-lived stalled ribosomes causing prolonged checkpoint activation. Thus, the cell adjusts this adaptive survival response to match the nature of the stalled ribosome.

2022-02-07 | PXD023976 | Pride

Unresolved stalled ribosome complexes restrict cycle progression after genotoxic stress

2022-02-07 | PXD023978 | Pride

Unresolved stalled ribosome complexes restrict cycle progression after genotoxic stress

2022-02-07 | PXD023861 | Pride

Sensing of individual stalled 80S ribosomes by Fap1 for non-functional rRNA turnover. Li et al

Project description:Cells can respond to stalled ribosomes by sensing ribosome collisions and employing quality control pathways. How ribosome stalling is resolved without collisions, however, has remained elusive. Here, focusing on non-colliding stalling exhibited by decoding-defective ribosomes, we identified Fap1 as a stalling sensor triggering 18S non-functional rRNA decay via poly-ubiquitination of uS3. Ribosome profiling revealed an enrichment of Fap1 at the translation initiation site but also association with elongating individual ribosomes. Cryo-EM structures of Fap1-bound ribosomes elucidated Fap1 probing the mRNA simultaneously at both the entry and exit channels suggesting a mRNA stasis sensing activity, and Fap1 sterically hinders formation of canonical collided di-ribosomes. Our findings indicate that individual stalled ribosomes are the potential signal for ribosome dysfunction, leading to accelerated turnover of the ribosome itself.

2022-09-15 | GSE159329 | GEO

Ubiquitination of Stalled Ribosome Triggers Ribosome-associated Quality Control [SET2]

Project description:Translation elongation stalling has the potential to produce toxic truncated protein fragments. Translation of either non-stop mRNA or transcripts coding for poly-basic sequences induces ribosome stalling, and the arrest product is degraded by the ribosome-mediated quality control (RQC) system. During this process, the stalled ribosome is dissociated into subunits, and the polypeptide is ubiquitinated by the E3 ubiquitin ligase Listerin on the 60S large ribosomal subunit, leading to subsequent proteasomal degradation. However, it is largely unknown how the specific stalled ribosomes are recognized as aberrant to engage the RQC system. Here, we report that ubiquitination of the ribosomal protein uS10 of the 40S small ribosomal subunit, by the E3 ubiquitin ligase Hel2 (or RQC-trigger (Rqt) 1) initiates RQC. We identified a novel RQC-trigger (RQT) complex composed of the RNA helicase-family protein Slh1/Rqt2, the ubiquitin binding protein Cue3/Rqt3, and yKR023W/Rqt4 that is required for RQC. The defects in RQC of the RQT mutants correlated with sensitivity to anisomycin, which stalls ribosome at the rotated form, suggesting that RQT factors rescue ribosomes stalled by this drug. Our un-biased survey by ribosome profiling revealed that ribosomes stalled at the rotated state with specific pairs of codons at P-A sites serve as RQC substrates. Rqt1 specifically ubiquitinates these arrested ribosomes to target them to the RQT complex, allowing subsequent RQC reactions including dissociation of the stalled ribosome into subunits. Our results provide mechanistic insight into the surveillance system for aberrant proteins induced by ribosome stalling and mediated by ribosome ubiquitination.

2017-07-31 | GSE90919 | GEO

Ribosome profiling study of dom34 and hbs1 knockout strains using short (16-nt) and long (28-nt) monosome-protected footprints and disome-protected footprints

Project description:Ribosomes that stall before completing peptide synthesis must be recycled and returned to the cytoplasmic pool. The protein Dom34 and cofactors Hbs1 and Rli1 can dissociate stalled ribosomes in vitro, but the identity of targets in the cell is unknown. Here we use ribosome profiling methodology to reveal a high- resolution molecular characterization of Dom34 function in vivo. We show that Dom34 removes stalled ribosomes from mRNAs that are truncated but, in contrast, does not generally dissociate ribosomes on coding sequences known to trigger stalling, such as polyproline. We also show that Dom34 targets arrested ribosomes near the ends of 3 ? UTRs. These ribosomes appear to gain access to the 3 ? UTR via a mechanism that does not require decoding of the mRNA. These results suggest that Dom34 carries out the important task of rescuing ribosomes found in noncoding regions. 25 samples are included in the study (2 mRNA-Seq samples and 23 ribosome footprint profiling samples). These include wild-type and dom34 or hbs1 knockout strains that were created in a variety of genetic backgrounds, treated with various agents in cell culture (e.g. diamide, 3-AT, or glucose starvation), treated differently during cell lysis (use of cycloheximide vs. other ribosome-stabilizing agents), or prepared in different ways after cell lysis (e.g. retention of short vs. long monosome-protected footprints or disome footprints).

2013-12-19 | E-GEOD-52968 | biostudies-arrayexpress

Ribosome collisions trigger subunit splitting in E. coli

Project description:Although many clinically important antibiotics inhibit bacterial ribosomes, the mechanisms by which bacterial cells rescue ribosomes stalled by antibiotics remain poorly understood. Ribosome stalling leads to collisions that recruit ribosome quality control (RQC) factors that recycle the ribosome subunits and target nascent proteins for degradation. Surprisingly, loss of known RQC factors in E. coli does not lead to significant antibiotic sensitivity, even though antibiotics stall ribosomes and induce collisions, suggesting the existence of additional, uncharacterized RQC mechanisms. Here we report a novel mechanism for ribosome quality control (RQC) in bacteria in which the DExH-box ATPase HrpA splits stalled ribosomes into subunits. HrpA selectively acts on collided ribosomes and its activity is dependent on ATP hydrolysis. The cryo-EM structure of HrpA bound to collided ribosomes reveals insight into its selectivity and mechanism: the C-terminal domain of HrpA senses the collision and its helicase domain bind mRNA downstream of the ribosomes, where it likely exerts a pulling force that destabilizes the stalled ribosome. These studies highlight the importance of ribosome splitting as a highly conserved RQC mechanism across all three domains of life and identify an important pathway in proteobacteria that allows proteobacteria to tolerate ribosome-targeting antibiotics.

2024-10-10 | GSE270401 | GEO

Cue2 and Slh1 define parallel pathways to rescue stalled ribosomes

Project description:Ribosome stalling at problematic sequences in mRNAs leads to collisions that trigger a collection of quality control events including ribosome rescue, targeting the nascent polypeptide for decay (Ribosome-mediated Quality Control or RQC), and targeting of the mRNA for decay (No Go Decay or NGD). Using a reverse genetic screen in yeast, we identify Cue2 as the endonuclease that is recruited to stalled ribosomes to promote NGD. Following Cue2-mediated cleavage, ribosomes upstream of the cleavage site translate to the end of the truncated mRNA and are rescued by the Dom34:Hbs1 complex. We also show that the putative helicase Slh1 (part of the RQC Trigger or RQT complex) removes collided ribosomes behind the lead stalled ribosome and thereby reduces endonucleolytic cleavage by Cue2. The synergistic activities of Cue2 and Slh1 define two parallel pathways that allow cells to recognize and respond to ribosomes trapped on problematic mRNAs.

2019-06-25 | GSE129128 | GEO

Mutant huntingtin stalls ribosomes and represses protein synthesis independent of fragile X mental retardation protein

Project description:Ribosomes translocate one codon at a time in mRNA during protein synthesis, but the regulators of ribosome translocation and their impact on neurodegenerative disease remain poorly understood. Here, we show that huntingtin (Htt) and its poly-Q expanded form, mHtt, a cause of Huntington disease (HD), promotes ribosome stalling and suppresses protein synthesis in vivo and in vitro. We found that fragile mental retardation protein (FMRP), a known promoter of ribosome stalling, is upregulated in HD cells and patients’ tissue. Unexpectedly, FMRP depletion fails to reverse mHtt-mediated ribosome stalling in HD cells. mHtt binds directly to ribosomes in a RNase-sensitive manner and interacts with ribosomal proteins. Combining high-resolution ribosome footprint profiling (Ribo-Seq) and RNA-Seq, we provide a global snapshot of stalling on mRNA transcripts, with a shift in ribosome occupancy toward the 5’ and 3’ end and single-codon unique pauses in HD cells. We also found ribosomes that appear to have stalled in mHtt mRNA before CAG repeat expansion. Thus, Htt regulates protein synthesis via ribosome stalling mechanisms and in turn may affect mRNA elongation, which may be exploited for HD therapeutics.

2021-04-06 | PXD017115 | Pride

Ribosome profiling study of dom34 and hbs1 knockout strains using short (16-nt) and long (28-nt) monosome-protected footprints and disome-protected footprints

2013-12-19 | GSE52968 | GEO