Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of yeast under conditions of ammonium, L-alanine or L-glutamine limitation

ABSTRACT: Response of Saccharomyces cerevisiae to Ammonium, L-alanine, or L-glutamine Limitation. The protrotophic laboratory strain CEN.PK113-7D (MAT a) was grown in laboratory fermentors with a working volume of 1 litre at dilution rate (D) of 0.20 per hour (in triplicate for each nitrogen limited condition). At steady state, samples from each of the 12 continuous cultures were taken and cooled below 2 degree C within ten seconds by mixing 40% sample and 60% crushed ice.

ORGANISM(S): Saccharomyces cerevisiae

SUBMITTER: Thomas Grotkjaer

PROVIDER: E-MEXP-724 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Global transcriptional and physiological responses of Saccharomyces cerevisiae to ammonium, L-alanine, or L-glutamine limitation.

Usaite Renata R Patil Kiran R KR Grotkjaer Thomas T Nielsen Jens J Regenberg Birgitte B

Applied and environmental microbiology 20060901 9

The yeast Saccharomyces cerevisiae encounters a range of nitrogen sources at various concentrations in its environment. The impact of these two parameters on transcription and metabolism was studied by growing S. cerevisiae in chemostat cultures with l-glutamine, l-alanine, or l-ammonium in limitation and by growing cells in an excess of ammonium. Cells grown in l-alanine-limited cultures had higher biomass yield per nitrogen mole (19%) than those from ammonium-limited cultures. Whole-genome tra ...[more]

PMID: 16957246

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Project description:Cells must adjust their gene expression in order to compete in a constantly changing environment. Two alternative strategies could in principle ensure optimal coordination of gene expression with physiological requirement. First, the internal physiological state itself could feedback to regulated gene expression. Second, the expected physiological state could be inferred from the external environment, using evolutionary-tuned signaling pathways. Coordination of ribosomal biogenesis with the requirement for protein synthesis appears to be particularly important, since cells devote a large fraction of their biosynthetic capacity for ribosomal biogenesis. To define the relative importance of internal vs. external sensing to the regulation of ribosomal biogenesis gene expression, we subjected S. cerevisiae cells to conditions which decoupled the actual vs. environmentally-expected growth rate. Gene expression followed the environmental signal according to the expected, but not the actual, growth rate. Simultaneous monitoring of gene expression and growth rate in chemostat-grown cultures further confirmed that ribosome biogenesis genes responded rapidly to changes in the environments but were oblivious to longer-term changes in growth rate. Our results suggest that the capacity to anticipate and prepare for environmental changes presented a major selection force during yeast evolution. Keywords: Saccharomyces_Cerevisiae, Stress response, ADH1 deletion, time courses, chemostat Experiment 1: ADH1 deletion cells, which grow faster on glycerol rather then glucose medium, were grown in both glucose and glycerol medium. The cells expression on glycerol is compared to their expression glucose (5 microarrays). Experiment 2: Time course of ADH1 deletion cells upon growth on glycerol and on glucose (7 microarrays). Experiment 3: Response of steady state grown cells to environmental perturbations. Cells were grown in glucose or histidine limited chemostats and reached steady state. The cells were then subjected to perturbations such as DTT, heat shock, NaCl, Clotrimazole, H2O2, and addition of limiting factors (histidine and glucose, respectively). Overall we have examined 10 timecourses with 83 microarrays.

Dataset Information

Transcription profiling of yeast under conditions of ammonium, L-alanine or L-glutamine limitation

Publications

Global transcriptional and physiological responses of Saccharomyces cerevisiae to ammonium, L-alanine, or L-glutamine limitation.

Similar Datasets

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