Recently, polylactic acid (PLA), a biodegradable polymer showing many valuable characteristics and friendly environment, has been widely used in industrial applications. Lactide formation from lactic acid has played crucial role on the PLA formation. Candida antarctica lipase B (CALB) with high enantioselectivity toward R-form of substrate was found to catalyze the lactide formation. However, the abundant source of S-lactic acid commercially produced through microbial fermentation of glucose was rarely catalyzed by CALB wild type. By using Autodock program, 2 amino acid residues Tryp104 and Thr138 on CALB displaying the key role on the enantioselectivity of CALB favouring R-form of alkyl lactate were found. CALB mutants from these sites were made and transformed successfully into Pichia pastoris X33. We are expected that these mutants will show the enantioselectivity toward S- form of lactide production.
키워드
enantioselectivitylactide formationcandida antarctica lipase B
저자
Anh Tuan LE QUANG [ Dept. of Chemical Engineering, Kwangwoon University, Seoul, 139-701. ]
Yong Hwan KIM [ Dept. of Chemical Engineering, Kwangwoon University, Seoul, 139-701. ]
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