Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Engineering of Sulfolobus acidocaldarius for Hemicellulosic Biomass Utilization

  • Lee, Areum (Department of Integrated Biological Science, College of Natural Sciences, Pusan National University) ;
  • Jin, Hyeju (Department of Integrated Biological Science, College of Natural Sciences, Pusan National University) ;
  • Cha, Jaeho (Department of Microbiology, College of Natural Sciences, Pusan National University)
  • Received : 2022.02.11
  • Accepted : 2022.02.22
  • Published : 2022.05.28
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Abstract

The saccharification of cellulose and hemicellulose is essential for utilizing lignocellulosic biomass as a biofuel. While cellulose is composed of glucose only, hemicelluloses are composed of diverse sugars such as xylose, arabinose, glucose, and galactose. Sulfolobus acidocaldarius is a good potential candidate for biofuel production using hemicellulose as this archaeon simultaneously utilizes various sugars. However, S. acidocaldarius has to be manipulated because the enzyme that breaks down hemicellulose is not present in this species. Here, we engineered S. acidocaldarius to utilize xylan as a carbon source by introducing xylanase and β-xylosidase. Heterologous expression of β-xylosidase enhanced the organism's degradability and utilization of xylooligosaccharides (XOS), but the mutant still failed to grow when xylan was provided as a carbon source. S. acidocaldarius exhibited the ability to degrade xylan into XOS when xylanase was introduced, but no further degradation proceeded after this sole reaction. Following cell growth and enzyme reaction, S. acidocaldarius successfully utilized xylan in the synergy between xylanase and β-xylosidase.

Keywords

Acknowledgement

This research was supported by PNU-RENovation (2020-2021) and the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (NRF-2019R1I1A2A01062787).

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