4th 2009 Annual Meeting of Korean Society for Glycoscience in 2009 (2009.11)바로가기
페이지
pp.11-12
저자
Joong-Hoon Ahn, Jung Na Ri, Kim Bong Gyu
언어
영어(ENG)
URL
https://www.earticle.net/Article/A192498
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원문정보
초록
영어
Glycosylation of plant secondary metabolites is mediated by family 1 glycosyltransferase, called uridine-diphosphate (UDP)-dependent glycosyltransferase (UGT). The N-terminal of UGT recognizes the sugar acceptor and the C-terminal interacts with the sugar-donor. Molecular basis of selection of sugar donor in UGT is not clear. UGT78D2 from Arabidopsis thaliana (AtUGT78D2) transfers a glucose group of UDP-glucose to 3-hydroxyl group of quercetin. On the other hand, the other UGT (ATUGT78D3), which showed 80 % amino acid identity to AtUGT78D2, uses UDP-arabinose as a sugar donor to make quercetin 3-O-arabinodise. Analysis of sugar binding site reveals that five amino acids are different between two UGTs. To find out which amino acid affects to their UDP-sugar donor selectivity, site-directed mutagenesis was performed. One amino acid at the C-terminal of AtUGT78D3 turned out to be critical for the selectionof UDP-sugar. With modeled structures of two AtUGT followed by site-directed mutagenesis, structural basis of UDP-selectivity in UDP-dependent glycosyltransferase is elucidated. Alternation of regioselectivity of UGTs is also challenging area. In order to alter the regioselelctivity, PGT-3 was used. PGTs uses quercetin as substrate and transferrs a glucose to the 4’ hydroxyl group. However, PGT-3 transferred a glucose group to the 3-hydroxyl group of isorhamnetin. Molecular modeling and docking and site directed mutagenesis were carried out to engineer a PGT-3 having a specificity for isorhamnetin but not for quercetin. The engineered PGT-3 that have exclusive activity toward isorhamnetin will be described.
저자
Joong-Hoon Ahn [ Department of Bioscience & Biotechnology, Bio/Molecular Informatics Center, Konkuk University ]
Jung Na Ri [ Department of Bioscience & Biotechnology, Bio/Molecular Informatics Center, Konkuk University ]
Kim Bong Gyu [ Department of Bioscience & Biotechnology, Bio/Molecular Informatics Center, Konkuk University ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.
간행물
간행물명
한국당과학회 학술대회
간기
연간
수록기간
2006~2022
십진분류
KDC 517DDC 614
이 권호 내 다른 논문 / 한국당과학회 학술대회 4th 2009 Annual Meeting of Korean Society for Glycoscience in 2009