Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Specific Expression Patterns of xyl1, xyl2, and xyl3 in Response to Different Sugars in Pichia stipitis

  • Han, Ji-Hye (Department of Bioprocess Engineering, Chonbuk National University) ;
  • Park, Ju-Yong (Graduate School of Semiconductor and Chemical Engineering, Chonbuk National University) ;
  • Kang, Hyun-Woo (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd.) ;
  • Choi, Gi-Wook (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd.) ;
  • Chung, Bong-Woo (Department of Bioprocess Engineering, Chonbuk National University) ;
  • Min, Ji-Ho (Department of Bioprocess Engineering, Chonbuk National University)
  • Received : 2009.12.17
  • Accepted : 2010.02.25
  • Published : 2010.05.28
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Abstract

The effects of two different sugars (glucose and xylose) on the expression levels and patterns of the xylose reductase (xyl1), xylitol dehydrogenase (xyl2), and xylulokinase (xyl3) genes were analyzed using Pichia stipitis. A significant increase in mRNA levels of xyl1 was observed after 6 h growth in culture conditions using xylose as a sole carbon source, but expressions of the three genes were not influenced by normal culture media with glucose. In addition, expressions of xyl2 and xyl3 were not observed during the entire culture period during which xylose was added. It also was found that the expression level of xyl1 increased as a function of the xylose concentration (40, 60, and 80 g/l) used in this study, indicating that xyl1 expression sensitively responded to xylose in the culture media. Although the induced level of xyl2 increased slightly after 48 h in the xylose-supplemented culture conditions, the expression of xyl2 was not observed in the xylitol-supplemented culture conditions. Finally, considering the expression of each gene in response to glucose or xylose, the absolute expression levels of the three genes indicate that xyl1 is induced primarily by exposure to xylose.

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References

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