Alginate is a gelling polysaccharide found as a major constituent of the cell wall and intracellular material in the brown seaweeds, Macrocystis, Laminaria and Ascophyllum. For the purposes of specific physical and biochemical properties, short length alginate, oligoalginate can be obtained by acid hydrolysis or alginate lyases. Alginate is a complex copolymer of α-L-guluronate (G) and its C5 epimer b-D-mannuronate (M), arranged as homopolymeric G blocks, M blocks, random heteropolymeric G/M blocks. Alginate lyases, also known as alginases or alginate depolymerases, catalyze the degradation of alginate by a b-elimination mechanism. Some bacterial strains produce several alginate lyases with different substrate specificities (polymannuronate lyase, EC 4.2.2.3, polyguluronate lyase, 4.2.2.11 and oligoalginate lyase, 4.2.2.-). In this study, the alginate lyase from Streptomyces sp. M3 which showed polyG-specific lyase activity was mutated for enhancing the lyase activity by using Stratagene random mutagenesis kit. When phenylalanine at residue 98 was replaced by leucine, the depolymerizing activity was decreased completely. Mutation of residue 197 with cysteine increased the activity about four fold compared to original M3 lyase. Acknowledgement : This work was supported by New &Renewable Energy R&D program(20093020090020) under the Korea Ministry of Knowledge Economy(MKE) and Korea Industrial Technology Foundation (KOTEF) through the Human Resource Training Project for Strategic Technology.
키워드
Alginate lyasepolyG specific lyaserandom mutagenesis
저자
Yu Jeong CHU [ Department of Food Science and Biotechnology, Kyungsung University, Busan 608-736, Korea. ]
Hee Sook KIM [ Department of Food Science and Biotechnology, Kyungsung University, Busan 608-736, Korea. ]
Eun Yeol LEE [ Department of Chemical Engineering, Kyung Hee University, 446-701, Korea. ]
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
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간행물
간행물명
한국생물공학회 학술대회
간기
반년간
수록기간
1985~2013
십진분류
KDC 476DDC 576
이 권호 내 다른 논문 / 한국생물공학회 학술대회 2011년도 한국생물공학회 춘계학술발표대회