Saccharomyces cerevisiae
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ABSTRACT:
PROVIDER: PRJNA128419 | ENA |
REPOSITORIES: ENA
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Project description:Extremely low specific growth rates (below 0.01 h-1) represent a largely unexplored area of microbial physiology. Retentostats enable controlled, energy-limited cultivation at near-zero specific growth rates while avoiding starvation. In this study, anaerobic, glucose-limited retentostats were used to analyze physiological and genome-wide transcriptional responses of Saccharomyces cerevisiae to cultivation at near-zero specific growth rates. Cultures at near-zero specific growth rates exhibited several characteristics previously associated with quiescence, including accumulation of storage polymers and an increased expression of genes involved in storage metabolism, autophagy and exit from the replicative cell cycle into G0. Analysis of transcriptome data from glucose-limited retentostat and chemostat cultures showed, as specific growth rate was decreased, quiescence-related transcriptional responses already set in at specific growth rates above 0.025 h-1. Many genes involved in mitochondrial processes were specifically upregulated at near-zero specific growth rates, possibly reflecting an increased turn-over of organelles under these conditions. Prolonged (> 2 weeks) cultivation in retentostat cultures led to induction of several genes that were previously implicated in chronological ageing. These observations stress the need for systematic dissection of physiological responses to slow growth, quiescence, ageing and starvation and indicate that controlled cultivation systems such as retentostats can contribute to this goal.
2011-08-23 | GSE22574 | GEO
Project description:Extremely low specific growth rates (below 0.01 h-1) represent a largely unexplored area of microbial physiology. Retentostats enable controlled, energy-limited cultivation at near-zero specific growth rates while avoiding starvation. In this study, anaerobic, glucose-limited retentostats were used to analyze physiological and genome-wide transcriptional responses of Saccharomyces cerevisiae to cultivation at near-zero specific growth rates. Cultures at near-zero specific growth rates exhibited several characteristics previously associated with quiescence, including accumulation of storage polymers and an increased expression of genes involved in storage metabolism, autophagy and exit from the replicative cell cycle into G0. Analysis of transcriptome data from glucose-limited retentostat and chemostat cultures showed, as specific growth rate was decreased, quiescence-related transcriptional responses already set in at specific growth rates above 0.025 h-1. Many genes involved in mitochondrial processes were specifically upregulated at near-zero specific growth rates, possibly reflecting an increased turn-over of organelles under these conditions. Prolonged (> 2 weeks) cultivation in retentostat cultures led to induction of several genes that were previously implicated in chronological ageing. These observations stress the need for systematic dissection of physiological responses to slow growth, quiescence, ageing and starvation and indicate that controlled cultivation systems such as retentostats can contribute to this goal. Independent duplicate retentostat cultures were subjected to microarray analysis at four time points after switching the effluent line to the filter unit (2, 9, 16 and 22 d). Microarray analysis of independent, triplicate anaerobic glucose-limited chemostat cultures grown at a specific growth rate of 0.025 h-1 (t = 0) were also performed as part of this study, resulting in a dataset of 11 arrays.
2011-08-22 | E-GEOD-22574 | biostudies-arrayexpress
Project description:Saccharomyces cerevisiae is an established microbial host for the production of non-native compounds. The synthesis of these compounds typically demands energy and competes with growth for carbon and energy substrate. Uncoupling product formation form growth would benefit product yields and decrease formation of by-product biomass. Studying non-growing metabolically-active yeast cultures provides a first step towards developing S. cerevisiae as a non-growing, robust cell factory. Non-growing metabolically-active cultures can be obtained in retentostat, a glucose-limited, continuous bioreactor system in which biomass accumulates while spent medium is constantly removed. Hitherto retentostat cultures of S. cerevisiae have only been reported under anaerobiosis, condition inappropriate for the production of energy-demanding products. The present study, using retentostat cultures, explores the physiology of non-dividing, fully respiring S. cerevisiae, focusing on industrially-relevant features. Following model-aided experimental design, retentostat cultivations were optimized for accelerated but smooth transition of S. cerevisiae from exponential growth to near-zero growth rates. During 20 days in retentostat the biomass concentration increased, leading very slow growth rates (specific growth rates below 0.001 h-1) but high culture viability (over 80% of viable cells). The maintenance requirement (mATP) was estimated at 0.64 mmolATP.gX-1.h-1, which is remarkably ca. 35% lower than the mATP measured in anaerobic retentostat cultures. Transcriptional down-regulation of genes involved in biosynthesis and up-regulation of stress-responsive genes towards near-zero growth rates corresponded well with data from anaerobic retentostats. More striking was the extreme heat-shock tolerance of S. cerevisiae, which exceeded by far previously reported heat shock tolerance of notoriously robust yeast cultures such as stationary phase cultures. Furthermore, while the metabolic fluxes in the retentostats were relatively low as a result of extreme caloric restriction, off-line measurements revealed that S. cerevisiae retained a high catabolic capacity. The high viability and extreme heat-shock tolerance revealed the robustness of S. cerevisiae at near-zero growth in retentostat. In addition, the relatively low maintenance requirements and high metabolic capacity under severe calorie restriction underline the potential of S. cerevisiae as a non-dividing microbial cell factory for the production of energy-intensive compounds. The retentostat is a promising tool to identify the molecular basis of this extreme robustness.
2016-06-01 | GSE77842 | GEO
Project description:Saccharomyces cerevisiae is an established microbial host for the production of non-native compounds. The synthesis of these compounds typically demands energy and competes with growth for carbon and energy substrate. Uncoupling product formation form growth would benefit product yields and decrease formation of by-product biomass. Studying non-growing metabolically-active yeast cultures provides a first step towards developing S. cerevisiae as a non-growing, robust cell factory. Non-growing metabolically-active cultures can be obtained in retentostat, a glucose-limited, continuous bioreactor system in which biomass accumulates while spent medium is constantly removed. Hitherto retentostat cultures of S. cerevisiae have only been reported under anaerobiosis, condition inappropriate for the production of energy-demanding products. The present study, using retentostat cultures, explores the physiology of non-dividing, fully respiring S. cerevisiae, focusing on industrially-relevant features. Following model-aided experimental design, retentostat cultivations were optimized for accelerated but smooth transition of S. cerevisiae from exponential growth to near-zero growth rates. During 20 days in retentostat the biomass concentration increased, leading very slow growth rates (specific growth rates below 0.001 h-1) but high culture viability (over 80% of viable cells). The maintenance requirement (mATP) was estimated at 0.64 mmolATP.gX-1.h-1, which is remarkably ca. 35% lower than the mATP measured in anaerobic retentostat cultures. Transcriptional down-regulation of genes involved in biosynthesis and up-regulation of stress-responsive genes towards near-zero growth rates corresponded well with data from anaerobic retentostats. More striking was the extreme heat-shock tolerance of S. cerevisiae, which exceeded by far previously reported heat shock tolerance of notoriously robust yeast cultures such as stationary phase cultures. Furthermore, while the metabolic fluxes in the retentostats were relatively low as a result of extreme caloric restriction, off-line measurements revealed that S. cerevisiae retained a high catabolic capacity. The high viability and extreme heat-shock tolerance revealed the robustness of S. cerevisiae at near-zero growth in retentostat. In addition, the relatively low maintenance requirements and high metabolic capacity under severe calorie restriction underline the potential of S. cerevisiae as a non-dividing microbial cell factory for the production of energy-intensive compounds. The retentostat is a promising tool to identify the molecular basis of this extreme robustness. The goal of the present study is to investigate the physiology of aerobic fully respiring S. cerevsiae at near-zero growth rates. Fundamental but industrially-relevant questions were addressed thanks to the design, implementation and study of aerobic retentostat cultivations enabling a rapid but smooth transition of S. cerevisiae from exponential growth to near-zero growth rates.
2016-06-01 | E-GEOD-77842 | biostudies-arrayexpress
Project description:Saccharomyces cerevisiae IMS0002 which, after metabolic and evolutionary engineering, ferments the pentose sugar arabinose. Glucose and arabinose-limited anaerobic chemostat cultures of IMS0002 and its non-evolved ancestor IMS0001 were subjected to transcriptome analysis to identify key genetic changes contributing to efficient arabinose utilization by strain IMS0002.
2011-03-01 | GSE27539 | GEO
Project description:In this study we focus on two Saccharomyces cerevisiae (CEN. PK series) strains producing either insulin precursor or amylase and we compare the transcriptional regulation at different dilution rates, in particular with the objective to identify the relationship between cell metabolism and recombinant protein production. We found that anaerobic conditions showed high amount of amylase productions when comparing to aerobic conditions and the genome-scale transcriptional analysis suggested that genes related to the endoplasmic reticulum (ER), lipid synthesis and stress responses were generally up-regulated at anaerobic conditions. Moreover, we proposed a model for the electron transfer from ER to the final electron acceptor, fumarate under anaerobic conditions. Two Saccharomyces cerevisiae strains producing either insulin precursor or amylase were selected at different dilution rates in chemostat cultivation for RNA extraction and hybridization on Affymetrix microarrays. Biological triplicates were applied.
2014-06-14 | E-GEOD-40934 | biostudies-arrayexpress
Project description:In this study we focus on two Saccharomyces cerevisiae (CEN. PK series) strains producing either insulin precursor or amylase and we compare the transcriptional regulation at different dilution rates, in particular with the objective to identify the relationship between cell metabolism and recombinant protein production. We found that anaerobic conditions showed high amount of amylase productions when comparing to aerobic conditions and the genome-scale transcriptional analysis suggested that genes related to the endoplasmic reticulum (ER), lipid synthesis and stress responses were generally up-regulated at anaerobic conditions. Moreover, we proposed a model for the electron transfer from ER to the final electron acceptor, fumarate under anaerobic conditions.
2014-06-14 | GSE40934 | GEO
Project description:LPS was used as a stressor to stimulate the model organism Saccharomyces cerevisiae. To detect extracellular metabolic information of VOCs. To provide a molecular basis for cellular metabolism of VOCs by proteome.
2023-12-18 | PXD047920 |
Project description:Physiology of S. cerevisiae during aerobic cultivation at near-zero specific growth rates
| PRJNA311716 | ENA
Project description:A six array study using total gDNA recovered from two separate cultures of each of three different strains of Saccharomyces cerevisiae (YB-210 or CRB, Y389 or MUSH, and Y2209 or LEP) and two separate cultures of Saccharomyces cerevisiae DBY8268. Each array measures the hybridization of probes tiled across the Saccharomyces cerevisiae genome.
2014-10-01 | GSE56441 | GEO