Starvation AD reactors
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB17954 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR1735500_1.fastq.gz | Fastqsanger.gz | |||
| ERR1735500_2.fastq.gz | Fastqsanger.gz | |||
| ERR1735510_1.fastq.gz | Fastqsanger.gz | |||
| ERR1735510_2.fastq.gz | Fastqsanger.gz | |||
| ERR1735520_1.fastq.gz | Fastqsanger.gz |
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Project description:Transcriptional profiling of marine ammonia oxidizing archaea Nitrosopumilus maritimus cells comparing exponential phase control cells with cells under 24 hours starvation and with cells under recovery after 24 hours starvation. Goal was to determine the effects of global transcriptional responses of N. maritimus cells under ammonia starvation and recovery conditions.
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Project description:In this study we examined an anaerobic digester reactor fed with cellulose in order to identify cellulose degrading microorganisms using a culture independent approach. A metagenome was linked to the newly synthesized proteins involved by cellulose, by investigation of labelled proteins (Protein-SIP). The study aims at identifying microorganisms involved in the degradation of plant-based biomass.
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Project description:This SuperSeries is composed of the following subset Series: GSE33790: The response and recovery of Arabidopsis thaliana transcriptome to phosphate starvation [ATH1-121501] GSE33996: The response and recovery of Arabidopsis thaliana transcriptome to phosphate starvation [At35b_MR] Refer to individual Series
2012-06-17 | E-GEOD-34004 | biostudies-arrayexpress
Project description:Investigation of the whole genome gene expression level changes relative to exponential phase growth in Nitrosomonas europaea ATCC19718 after 12 hours ammonia starvation, 144 hours ammonia starvation, and 20 minutes following ammonia addition to starved cells. The ammonia monooxygenase of chemolithotrophic ammonia oxidizing bacteria (AOB) catalyzes the first step in ammonia oxidation by converting ammonia to hydroxylamine. The monooxygenase of Nitrosomonas europaea is encoded by two nearly identical operon copies (amoCAB1,2). Several AOB, including N. europaea, also posess a divergent monocistronic copy of amoC (amoC3) of unknown function. Previous work suggested a possible functional role for amoC3 in N. europaea during recovery from extended ammonia starvation as part of the σE- stress response regulon during the recovery of N. europaea from extended ammonia starvation, thus indicating its importance during the exit of cells from starvation. We here used global transcription analysis to show that expression of amoC3 is part of a general post-starvation cellular response system in N. europaea. We also found that amoC3 is required for efficient exit from prolonged ammonia starvation, as deleting this gene impaired growth at elevated temperatures and recovery following starvation under high oxygen tensions. Deletion of the σ32 global stress response regulator demonstrated that the heat shock regulon also plays a significant role in mediating the recovery of N. europaea from starvation. These findings provide the first described phenotype associated with the divergent AmoC3 subunit which appears to function as a stress responsive subunit capable of maintaining ammonia oxidation activity under stress conditions.
2012-08-03 | GSE35122 | GEO
Project description:Investigation of the whole genome gene expression level changes relative to exponential phase growth in Nitrosomonas europaea ATCC19718 after 12 hours ammonia starvation, 144 hours ammonia starvation, and 20 minutes following ammonia addition to starved cells. The ammonia monooxygenase of chemolithotrophic ammonia oxidizing bacteria (AOB) catalyzes the first step in ammonia oxidation by converting ammonia to hydroxylamine. The monooxygenase of Nitrosomonas europaea is encoded by two nearly identical operon copies (amoCAB1,2). Several AOB, including N. europaea, also posess a divergent monocistronic copy of amoC (amoC3) of unknown function. Previous work suggested a possible functional role for amoC3 in N. europaea during recovery from extended ammonia starvation as part of the σE- stress response regulon during the recovery of N. europaea from extended ammonia starvation, thus indicating its importance during the exit of cells from starvation. We here used global transcription analysis to show that expression of amoC3 is part of a general post-starvation cellular response system in N. europaea. We also found that amoC3 is required for efficient exit from prolonged ammonia starvation, as deleting this gene impaired growth at elevated temperatures and recovery following starvation under high oxygen tensions. Deletion of the σ32 global stress response regulator demonstrated that the heat shock regulon also plays a significant role in mediating the recovery of N. europaea from starvation. These findings provide the first described phenotype associated with the divergent AmoC3 subunit which appears to function as a stress responsive subunit capable of maintaining ammonia oxidation activity under stress conditions. A twelve chip study using total RNA recovered from four timepoints for each of three biological replicates of wild-type cultures of Nitrosomonas europaea ATCC 19718. Total RNA was obtained from each biological culture replicate during exponential growth, following 12 hours ammonia starvation, 144 hours ammonia starvations, and 20 minutes following ammonia addition to starved cells.
2012-08-02 | E-GEOD-35122 | biostudies-arrayexpress
Project description:Recent pre-clinical data provide strong evidence that short-term starvation before the administration of cytostatic drugs for the chemotherapy of solid tumors leads to significantly higher efficacy and lower toxicity levels. However, these findings have so far not been validated in patients. The aim of this trial is to provide first clinical evidence regarding the impact of pre-chemotherapeutic short-term starvation on response to therapy (primary endpoint). Additionally, progression-free survival, adverse events, and overall survival will be monitored (secondary endpoints). In perspective, short-term starvation before chemotherapy could represent a simple and secure way to improve both efficacy and tolerance of chemotherapies at low cost.
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Project description:Cells arrest growth and enter a quiescent state upon nutrient deprivation. However, the molecular processes by which cells respond to different starvation signals to regulate exit from the cell division cycle and initiation of quiescence remains poorly understood. To study the role of protein expression and signaling in quiescence we combined temporal profiling of the proteome and phosphoproteome using stable isotope labeling with amino acids in cell culture (SILAC) in Saccharomyces cerevisiae (budding yeast). We find that carbon and phosphorus starvation signals activate quiescence through largely distinct proteome and phosphoproteome remodeling. However, increased expression of mitochondrial proteins is essential for quiescence establishment in response to both starvation signals. Whereas the quiescent proteome is established within 6 hours of starvation the quiescent phosphoproteome undergoes continuous changes for at least 30 hours following initial starvation. Deletion of the putative quiescence regulator RIM15, which encodes a serine-threonine kinase, results in reduced survival of cells starved for phosphorus and nitrogen, but not carbon. However, we identified common protein phosphorylation roles for RIM15 in quiescence that are enriched for RNA metabolism and translation. We also find evidence for RIM15-mediated phosphorylation of some targets, including IGO1, prior to starvation consistent with a functional role for RIM15 beyond quiescence regulation. Finally, we find evidence for widespread catabolism of amino acids in response to nitrogen starvation, indicating widespread amino acid recycling via salvage pathways in conditions lacking environmental nitrogen. Our study defines an expanded quiescent proteome and phosphoproteome in yeast, and highlights the multiple coordinated molecular processes at the level of protein expression that are required for quiescence.
2023-11-02 | PXD044239 | Pride
Project description:To learn about the cellular processes involved in Mg2+ transport and the mechanisms allowing cells to cope with low Mg2+ availability, we performed RNA expression profiling experiments, and followed changes in gene activity upon Mg2+ depletion on a genome-wide scale. A striking portion of genes up-regulated under Mg2+ depletion is also induced by high Ca2+ and/or alkalinization. Among the genes significantly up-regulated by Mg2+ starvation, Ca2+ stress and alkalinization are ENA1 (encoding a P-type ATPase sodium pump) and PHO89 (encoding a sodium/phosphate cotransporter). We show that up-regulation of these genes is dependent on the calcineurin/Crz1p signaling pathway. Similarly to Ca2+ stress, Mg2+ starvation induces translocation of the transcription factor Crz1p from the cytoplasm into the nucleus. The up-regulation of ENA1 and PHO89 upon Mg2+ starvation depends on extracellular Ca2+. Using fluorescence resonance energy transfer microscopy we demonstrate that removal of Mg2+ results in an immediate increase in free cytoplasmic Ca2+. This effect is dependent on external Ca2+. Results presented indicate that Mg2+ depletion in yeast cells leads to enhanced cellular Ca2+ concentrations, which activate the Crz1p/calcineurin pathway. We provide evidence that calcineurin/Crz1p signaling is crucial for yeast cells to cope with Mg2+ depletion stress. Keywords: stress response (magnesium starvation)
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