Alginate lyases, also known as alginases or alginate depolymerases, catalyze the degradation of alginate by a β-elimination mechanism that has yet to be fully elucidated. Alginate is a copolymer of α-L-guluronate (G) and its C5 epimer β-D-mannuronate (M), arranged as homopolymeric G blocks, M blocks, alternating GM or random heteropolymeric G/ M stretches. Almost all alginate lyases depolymerize alginate in an endolytical fashion via a β-elimination reaction. The alginate lyase Atu3025 from Agrobacterium tumefaciens strain C58, consisting of 776 amino-acid residues, is a novel exotype alginate lyase classified into polysaccharide lyase family 15. Till now there is no crystal structure available for this class of proteins. Since there is no template with high sequence identity, three-dimensional coordinates for exotype alginate lyase (PL 15 family) were determined using modeling methods (Comparitive modeling and Fold recognition). The structures were modeled using the X-ray coordinates from Heparinase protein family (PDB code: 3E7J). This enzyme (Atu3025) displays enzymatic activity for both poly-M and poly-G alginate. Since poly-M is widespread; docking of a tri-mannuronate against the modeled structure was performed. We identified some of those residues which are crucial for lyase activity. The results from this study should guide future mutagenesis studies and also provides a starting point for further proceedings.
목차
Abstract 1. Introduction 2. Materials and methods 2.1. Construction of the Homology Model 2.2. Fold Recognition 2.3. Molecular Docking 3. Results 3.1. Sequence Analysis of Exotype Alginate Lyase 3.2. Fold Recognition 3.3. Homology Modeling and Model Validation 3.4. Docking of Alginate Trimer into the Docking Site 5. Conclusion References
Gugan Kothandan [ Department of Bio-New Drug Development, College of Medicine, Chosun University ]
Seung Joo Cho [ Department of Bio-New Drug Development, College of Medicine, Chosun University, Department of Cellular·Molecular Medicine and Research Center for Resistant Cells, College of Medicine, Chosun University ]
Corresponding author
조선대학교 기초과학연구원 [The Natural Science Research Institute of Chosun]
설립연도
2008
분야
자연과학>자연과학일반
소개
본 연구원은 기초과학을 진흥하기 위한 연구·교육 및 그 보급을 목적으로 한다. 이 목적을 달성하기 위하여 다음 각 호의 사업을 수행한다.
1. 기초과학 제 분야에 관한 조사와 연구
2. 기초과학에 관한 학술행사(학술대회, 학술세미나, 심포지엄, 초청강연회 등) 개최
3. 학문후속세대 및 일반인을 위한 기초과학 교육
4. 기관지『조선자연과학논문지』 발간
5. 『자연과학연구총서』, 『자연과학번역총서』 등 단행본 발간
6. 기타 본 연구원의 목적과 관련된 사업
간행물
간행물명
통합자연과학논문집(구 조선자연과학논문집) [Journal of Integrative Natural Science]