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Helicase Ded1 fine-tunes the reprogramming of gene expression conferred by inhibition of TORC1 by rapamycin.

ABSTRACT: Helicase Ded1 fine-tunes the reprogramming of gene expression conferred by inhibition of TORC1 by rapamycin.

PROVIDER: PRJNA1082295 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28166448.fastq.gz	Fastqsanger.gz
	SRR28166449.fastq.gz	Fastqsanger.gz
	SRR28166450.fastq.gz	Fastqsanger.gz
	SRR28166451.fastq.gz	Fastqsanger.gz
	SRR28166452.fastq.gz	Fastqsanger.gz

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Helicase Ded1 fine-tunes the reprogramming of gene expression conferred by inhibition of TORC1 by rapamycin.

Project description:The role of Ded1 helicase is pivotal in reducing ribosomal biogenesis and inducing autophagy under TORC1 inhibition. Incorporating mutations in Ded1 rescues these effects, leading to rapamycin resistance.

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TORC1 signaling pathway inhibition by rapamycin and caffeine affect lifespan, global gene expression and cell proliferation of fission yeast

Project description:Target of rapamycin complex 1 (TORC1) is implicated in growth control and aging from yeast to humans. Fission yeast is emerging as a popular model organism to study TOR signaling, although rapamycin has been thought to not affect cell growth in this organism. Here we analyzed the effects of rapamycin and caffeine, singly and combined, on multiple cellular processes in fission yeast. The two drugs led to diverse and specific phenotypes that depended on TORC1 signaling pathway inhibition, including prolonged chronological lifespan, inhibition of global translation, inhibition of cell growth and division, and reprogramming of global gene expression mimicking nitrogen starvation. Rapamycin and caffeine differentially affected these various TORC1-dependent processes. Combined drug treatment augmented most phenotypes and effectively blocked cell growth. Although rapamycin showed a much more subtle effect on global translation than did caffeine, rapamycin was more effective in prolonging chronological lifespan. Rapamycin prolonged the lifespan of non-growing cells only when applied during the growth phase but not when applied after cells had stopped proliferation. The doses of rapamycin and caffeine strongly correlated with growth inhibition and with lifespan extension. This comprehensive analysis will inform future studies into TORC1 function and cellular aging in fission yeast and beyond.

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Sch9 Is a Major Target of TORC1 in Saccharomyces cerevisiae

Project description:The Target Of Rapamycin (TOR) protein is a Ser/Thr kinase that functions in two distinct multiprotein complexes: TORC1 and TORC2. These conserved complexes regulate many different aspects of cell growth in response to intra- and extracellular cues. Here we report the first bona fide substrate of yeast TORC1: the AGC-kinase Sch9. Six amino acids in the c-terminus of Sch9 are directly phosphorylated by TORC1. Phosphorylation of these residues is lost upon rapamycin-treatment as well as carbon- or nitrogen-starvation and transiently reduced following application of osmotic, oxidative or thermal stress. TORC1-dependent phosphorylation is required for Sch9 activity and replacement of residues phosphorylated by TORC1 with Asp/Glu renders Sch9 activity TORC1-independent. Sch9 is required for TORC1 to properly regulate ribosome biogenesis, translation initiation and entry into G0 phase, but not expression of Gln3-dependent genes. Our results suggest that Sch9 functions analogously to the mammalian TORC1 substrate S6K1 rather than the mTORC2 substrate PKB/Akt. Keywords: time course, cell type. Global transcriptional analysis of rapamycin response was conducted on cells expressing either a wild-type, Sch9(WT), or TOR-independent allele of Sch9, Sch9(2D3E). Reference samples used were cells collected immediately prior to rapamycin treatment for the respective cell genotypes. Test samples were collected 20, 30, 60, 90, 120, and 180min post rapamycin treatment.

2010-09-15 | E-GEOD-7660 | biostudies-arrayexpress

Sch9 Is a Major Target of TORC1 in Saccharomyces cerevisiae

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TORC1 is required for the entry of yeast gametes into the mitotic cell cycle

Project description:Purpose:To identify the targets of TORC1 during spore germination in budding yeast Results:We obtained the transcriptomes of germinating spores in the presence and absence of rapamycin with and average Read Count = 14,009,863 and an Average Overall alignment: 95.23%. Differentialy expressed genes were identified by comparing the spore germination at various time points in the presence and absence of Rapamycin. Conclusions: Our transcriptomic analyses has revealed a role for TORC1 in regulating the glucose response genes

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Expression data of yeast genes treated with rapamycin and compound CID 3528206

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Gene expression comparison between yeast histone H2B WT and H2B R95A mutant without and with rapamycin treatment.

Project description:This microarray data is the Affymetrix array of RNA expressed by Wild Type and Mutant strains yeast that is untreated and treated with rapamycin. In yeast, rapamycin inhibits the TORC1 kinase signaling pathway causing rapid alteration in gene expression and ultimately cell cycle arrest in G1 and this study provides a new insight whereby rapamycin signaling via the Torc1 kinase may exploit the pheromone pathway.

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The Ccr4-Not complex regulates TORC1 signaling and mitochondrial metabolism by promoting vacuole V-ATPase activity

Project description:The Ccr4-Not complex is an effector of multiple signaling pathways controlling gene transcription and mRNA turnover. Herein, we provide evidence that Ccr4-Not also activates nutrient signaling through the essential target of rapamycin complex 1 (TORC1) pathway. Mechanistically, Ccr4-Not loss decreases TORC1 signaling due to reduced stability of the vacuole V-ATPase that is required to activate TORC1 when associated with the Gtr1 GTPase containing EGO complex. Expressing a constitutively active Gtr1 in Ccr4-Not deficient cells bypasses the requirement for the V-ATPase and restores TORC1 signaling. Transcriptome analysis reveals that Ccr4-Not loss activates TORC1 repressed retrograde signaling to remodel metabolism and enhance mitochondrial function. Blocking retrograde signaling in a Ccr4-Not mutant further reduces TORC1 signaling, thus suggesting the enhanced mitochondrial metabolism due to Ccr4-Not loss is a metabolic adaptive response required to sustain TORC1 activity. Therefore, Ccr4-Not is a critical activator of TORC1 signaling that regulates cellular metabolism.

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Transcription profiling by array of yeast treatment with rapamycin and compound CID 3528206

Project description:Compound CID 3538206 inhibits yeast TORC1 activity and functionally mimic rapamycin. We used microarrays to compare the global gene expression with the treatment of CID 3528206 and rapamycin. BY4741 yeast cells were treated with1% DMSO, 20 uM CID 3528206 and 200 nM rapamycin in duplicate for 3hrs. RNA extracted and labeled to probe yeast gene arrays

2012-04-30 | E-GEOD-33320 | biostudies-arrayexpress

Multilayered control of protein turnover by TORC1 and ATG1

Project description:To study TORC1-Atg1 signaling comprehensively and to identify potential additional foci of crosstalk, we chose a mass spectrometry (MS)-based phosphoproteomics strategy combing global proteomics screens in vivo with targeted analyses using in vitro kinase reactions. We present the currently largest compendium of rapamycin-sensitive phosphorylation events in the yeast Saccharomyces cerevisiae, identify numerous unknown TORC1 and Atg1 downstream phosphorylation events, and characterize hitherto unknown, functionally relevant TORC1 target sites on defined Atg proteins.

2019-09-30 | PXD013271 | Pride

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