Byoung Hoon YOON, Woo Young JEON, Woo Yong SHIM, Jung Hoe KIM
언어
영어(ENG)
URL
https://www.earticle.net/Article/A129376
※ 원문제공기관과의 협약기간이 종료되어 열람이 제한될 수 있습니다.
원문정보
초록
영어
Xylose reductase (XR) is a key enzyme in xylitol production, catalyzing the reduction of D-xylose to xylitol. However, most XRs from yeasts containing Candida tropicalis have a higher activity for L-arabinose than D-xylose, and this broad substrate acceptance causes the formation of an arabitol byproduct. To disrupt endogenous XR activity, four strands of the XR gene were deleted completely from C. tropicalis BSXDH-3 (a XYL2-disrupted mutant). The resulting strain, C. tropicalis K1, showed no XR activity. Neurospora crassa XR (NcXR) was codon-optimized for heterologous expression in C. tropicalis and point-mutated for decrease of catalytic efficiency toward L-arabinose. XR activity for L-arabinose was not detected in engineered NcXRexpressing yeast, C. tropicalis KNV. In addition, codon-optimized Bacillus licheniformis L-arabinose isomerase (araA, AI), E. coli L-ribulokinase (araB, RK) and L-ribulose-5-phosphate 4-epimerase (araD, RPE) were introduced sequentially to KNV. The resulting C. tropicalis expressed these genes functionally and utilized L-arabinose for supporting metabolism. In xylitol fermentation using xylose and arabinose as substrates, xylose was converted with nearly theoretical maximum yield of 100 % and no arabitol was formed.
키워드
XylitolArabitolArabinosearaBAD
저자
Byoung Hoon YOON [ Dept. of Biological Sciences, KAIST, Daejeon, Korea. ]
Woo Young JEON [ Dept. of Biological Sciences, KAIST, Daejeon, Korea. ]
Woo Yong SHIM [ Dept. of Biological Sciences, KAIST, Daejeon, Korea. ]
Jung Hoe KIM [ Dept. of Biological Sciences, KAIST, Daejeon, Korea. ]
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