Oxidosqualene Cyclases from Cell Suspension Cultures of Betula platyphylla var.japonica: Molecular Evolution of Oxidosqualene Cyclases in Higher Plants
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概要
- 論文の詳細を見る
Betula platyphylla var.japonica is a rich source of triterpenoid as it contains dam mar an e type triterpenes in the leaves, and lupane type and oleanane type triterpenes in the bark. Four Oxidosqualene cyclase cDNAs (BPX, BPX2, BPW and BPY) were cloned by homology based PCR methods from cell suspension cultures of B. platyphylla var.japonica. Open reading frames consisting of 2274, 2304, 2268 and 2340 bp were ligated into yeast expression plasmid pYES2 under the control of GALI promoter and introduced into lanosterol synthase deficient (erg7) Saccharomyces cerevisiae strain GIL77. Analyses of in vitro enzyme activities and/or accumulated products in the transformants demonstrated that they encode cycloartenol synthase (BPX and BPX2), lupeol synthase (BPW) and β-amyrin synthase (BPY) proteins. Phylogenetic tree was constructed for all the known Oxidosqualene cyclascs (OSCs) including the clones obtained in this study, revealing that OSCs having the same enzyme func tion form respective branches in the tree even though they derive from different plant speeies. Intriguing correlation was found between reaction mechanism and molecular evolution of OSCs in higher plants.
- 公益社団法人日本薬学会の論文
- 2003-05-01
著者
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SUZUKI Masashi
RIKEN Plant Science Center
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Shibuya Masaaki
Graduate School of Pharmaceutical Sciences, The University of Tokyo
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Ebizuka Yutaka
Graduate School of Pharmaceutical Sciences, The University of Tokyo
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Zhang H
Graduate School Of Pharmaceutical Sciences The University Of Tokyo
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YOKOTA Shinso
Faculty of Agriculture, Utsunomiya University
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Yokota Shinso
Faculty Of Agriculture Utsunomiya University
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Yokota S
Faculty Of Agriculture Utsunomiya University
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Ebizuka Y
Graduate School Of Pharmaceutical Sciences The Univ. Of Tokyo
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Ebizuka Yutaka
Graduate School Of Pharmaceutical Sciences The University Of Tokyo
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Shibuya Masaaki
Graduate School Of Pharmaceutical Sciences The University Of Tokyo
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渋谷 雅明
Riken Plant Science Center
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ZHANG Hong
Graduate School of Natural Science and Technology, Okayama University
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Shibuya Masaaki
Graduate School Of Pharmaceutical Sciences The Univ. Of Tokyo
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