Earticle

초록

영어

Since yeast is often exposed to a number of environmental stresses including high ethanol concentration and temperature, the ability to grow and produce ethanol under such stressful conditions is an important factor in industrial bioethanol production. Trehalose is found in many organisms including Saccharomyces cerevisiae, and has been known to play an important role in enhancing various types of stress tolerance. In this study, Streptomyces albus trehalose-6-phosphate synthase gene (salC) was expressed in Saccharomyces cerevisiae, and the recombinant strain with salC gene showed significantly improved stress resistances and ethanol production. The stress sensitivity and viability tests indicated that the recombinant had a greater resistance to ethanol than the control. The results of flask cultures at an elevated temperature showed that the expression of salC played a good role of protecting cells from the heat stress. The recombinant strain was found to consume 100 g/L glucose and produce 39 g/L ethanol at 40 °C with an ethanol yield 6 % higher than that of the control strain. In the fed-batch experiment in a bioreactor to investigate ethanol production capability of the recombinant strain under a high-ethanol stress condition as in the industrial practice, it produced 69 g/L ethanol with about 18% higher yield and about 13% higher productivity than the control strain.

키워드

저자

• Jayoung RYU [ Department of Chemical and Biomolecular Engineering, KAIST. ]
• Myung Hee MOON [ Department of Chemical and Biomolecular Engineering, KAIST. ]
• Yong Keun CHANG [ Department of Chemical and Biomolecular Engineering, KAIST. ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국생물공학회 학술대회

• 간기

  반년간

• 수록기간

  1985~2013

• 십진분류

  KDC 476 DDC 576