Title page for etd-0808108-102949


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URN etd-0808108-102949
Author Yi-Ju Shih
Author's Email Address july13@ms35.hinet.net
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Department Biological Sciences
Year 2007
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Effect of YDL100c Deficiency on the Growth of  Saccharomyces cerevisiae in the Presence of Zinc
Date of Defense 2008-06-26
Page Count 56
Keyword
  • YDL100c Deficiency
  • Saccharomyces cerevisiae
  • Zinc
  • Abstract ArsA is the catalytic component of an arsenite extrusion pump in E. coli that confers arsenite and antimonite resistance. YDL100cp is the ArsA homologous protein found in S. cerevisiae. Previous studies show that YDL100c gene is not directly related to arsenical resistance mechanism in S. cerevisiae but the YDL100c disrupted strain (KO) showed sensitivity to Zn2+ at 30oC and more pronounced sensitivity at 37oC. To study the role of YDL100c on Zn2+ sensitivity, wild type strain (WT) and KO were grown at 30oC and 37oC for 6 hr after adding Zn2+. Both strains were assayed for trehalose accumulation, intracellular oxidation level and GSH content. The results demonstrate that KO had a decreased growth and increased intracellular oxidation at 37oC when compared to WT. Addition of Zn2+ did not increase the intracellular oxidation in WT and KO grown at 30oC but to a greater extent in KO compared to WT grown at 37oC. Further assess the function of antioxidant genes shows that there is no significant difference in SOD1 expression between KO and WT grown at 37oC but CTT1 expression is low in KO. There is an increase in catalase activity for both WT and KO by adding Zn2+ at 30oC or 37oC, but the level of catalase activity to KO is still lower than that of WT.In conclusion, a defect of YDL100c results in a defect in the activation of general stress response at 37oC. Consequently, the cause of the increased level of intracellular oxidation of KO in the presence of Zn2+ grown at 37oC is most likely related to the decrease in cellular GSH content and trehalose accumulation in KO compared to that of WT. Therefore, the pronounced sensitivity to Zn2+ at 37oC is mainly due to a defect in general stress response in KO when grown at 37oC.
    Advisory Committee
  • Zin-Huang Liu - chair
  • Jong-Kang Liu - co-chair
  • Ching-Mei Hsu - advisor
  • Files
  • etd-0808108-102949.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2008-08-08

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