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      Gene expression profiling in Saccharomyces cerevisiae grown at different specific gravity environments

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      Danmei_thesis.pdf (2.192Mb)
      Date
      2007-12-05
      Author
      Yang, Danmei
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      The global gene expression profiles of industrial strains of Saccharomyces cerevisiae responding to nitrogen deficiency and very high sugar concentrations stresses were determined by oligonucleotide microarray analysis of ~ 6200 yeast open reading frames. Genomics analysis showed that 400 genes in S. cerevisiae was differentially expressed by more than 1.5-fold compared with controls at late-logarithmic phase of fermentation, as the yeast adapted to changing nutritional, environmental and physiological conditions. The genes of many pathways are regulated in a highly coordinated manner. The repressed expression of GDH1 and up-regulation of ARO10 within the contrast of Q270/Q10 indicated high energy demanding of yeast cells under high sugar stress. Activities of G3P shuttle indicated that under very high gravity environment, sufficient assimilatory nitrogen enhances yeast’s ability of redox balancing, and therefore higher stress-tolerance and higher fermentation efficiency of yeast. Under contrast W270/Q270, the up-regulation of DUR1,2 responsible for urea degradation induces the glutamate biosynthesis and the consumption of -ketoglutarate. This may indicate that higher nitrogen level would enable higher activities in the TCA cycle, and therefore generate more energy for biosynthesis and yeast cell proliferation under very high gravity fermentation conditions. Nitrogen metabolism was also stimulated by high nitrogen level when yeast was grown in very high gravity environment.
      Degree
      Master of Science (M.Sc.)
      Department
      Chemical Engineering
      Program
      Chemical Engineering
      Supervisor
      Lin, Yen-Han
      Committee
      Wu, Fang-Xiang; Evitts, Richard W.; Nemati, Mehdi
      Copyright Date
      December 2007
      URI
      http://hdl.handle.net/10388/etd-12042007-115558
      Subject
      metabolic pathway
      Saccharomyces cerevisiae
      gene expression
      microarray
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