Circular permutation of enzymes offers an alternative protein engineering strategy forchanging the substrate specificity, as well as improving enantioselectivity and catalyticperformance of biocatalysts. In previous work on lipase B from Candida antarctica (CALB),we demonstrated that the reorganization of the polypeptide sequence results in significant rateenhancements. These functional changes were linked to structural rearrangements alteringactive site accessibility and backbone flexibility. To more broadly explore the potential functional benefits of circular permutatedenzymes, we have now expanded our engineering studies to include two new biocatalystswith distinct folds: the xylanase from Bacillus circulans (BcX) and old yellow enzyme fromSaccharomyces cerevisiae (OYE). BcX is an endo-acting glycosyl hydrolase with a betajellyrollfold while OYE is a member of the flavin-dependent oxidoreductase family with analpha/beta barrel topology. The results from our random circular permutation experimentsand the structural and functional characterization of selected enzyme variants will bepresented. In the case of OYE, the effects of active site reorganization are not limited tosubstrate specificity and enantioselectivity but can potentially extend to changes in chemistry, due to the remodeling of the flavin cofactor environment. Besides highlighting the method’ ability for creating novel biocatalysts, our new studies also demonstrates that not all enzymesare created equal when it comes to engineering by circular permutation.
저자
Stefan LUTZ [ Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322-2201, USA ]
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
간행물
간행물명
한국생물공학회 학술대회
간기
반년간
수록기간
1985~2013
십진분류
KDC 476DDC 576
이 권호 내 다른 논문 / 한국생물공학회 학술대회 2011년도 한국생물공학회 춘계학술발표대회