Woo Yong SHIM, Byoung Hoon YOON, Woo Young JEON, Jung Hoe KIM
언어
영어(ENG)
URL
https://www.earticle.net/Article/A115094
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원문정보
초록
영어
Recently, approximately 98% of the theoretical maximum xylitol yield has been reached using XYL2-disrupted Candida tropicalis(BSXDH-3) in batch fermentation. As a follow-up study, this study aims at enhancing xylitol production rate using glucose as a co-substrate. First, we introduced Neurospora crassa xylose reductase gene under the control by C. tropicalis GAPDH promoter for high level expression in the presence of glucose. After this, xylitol production increased in glucose-limited fed-batch fermentation remarkably. Second, glycolytic enzymes which consist of EMP pathway were blocked. As well known, NADPH is mainly generated through the oxidative part of the pentose phosphate pathway. By this knockout strategy, resulting extensive flux through the PP pathway can produce NADPH. Phosphoglucose isomerase(pgi) and phosphofructokinase (pfk1,2) are key enzymes in glucose metabolism. Two strands of pgi and each pfk1,2 gene in the diploid yeast C. tropicalis were sequentially disrupted using the Urablasting method. Interestingly, inactivation of pgi and pfk1,2 didn't led to great reduction of maximum specific growth rate. As a consequence, only deleting pfk from strain BSXDH-3 improved the xylitol production rate during batch culture and deleting either or both pgi and pfk1,2 showed increased xylitol production rate in glucose-limited fed-batch fermentations, which was about 1.2-fold higher than that obtained from the control strain.
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
이 법인은 생물 공학의 발전과 보급에 이바지하고, 회원 상호 간의 연구 협력과 친목을 도모함을 목적으로 한다
1. 생물공학 분야의 발전을 위한 연구 협력
2. 생물공학의 실용화를 촉진시키기 위한 산학 협동
3. 학술연구 발표회, 강연회, 연수회 등 학술활동의 개최
4. 국,영문 학술지,소식지,학술회의 Proceedings 및 학술도서의 발간
5. 생물공학 발전을 위한 정책 건의
6. 기타 국제 교류 등 본 학회의 목적 달성을 위한 제반 활동