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http://dx.doi.org/10.5352/JLS.2004.14.3.435

Overexpression of the get Gene Encoding 4-α-Glucanotransferase of a Hyperthermophilic Archaeon, Thermococcus litoralis  

Jeon, Beong-Sam (Institute of Life Science, Gyeongsang National University)
Park, Jeong-Won (Institute of Life Science, Gyeongsang National University)
Shin, Gab-Gyun (Institute of Life Science, Gyeongsang National University)
Kim, Beom-Kyu (Institute of Life Science, Gyeongsang National University)
Kim, Hee-Kyu (Institute of Life Science, Gyeongsang National University)
Song, Jae-Young (Department of Microbiology, College of Medicine, Gyeongsang National University)
Cho, Young-Su (Department of Biotechnology, College of Natural Resources and Life Science, Dong-A University)
Cha, Jae-Young (Institute of Life Science, Gyeongsang National University)
Publication Information
Journal of Life Science / v.14, no.3, 2004 , pp. 435-440 More about this Journal
Abstract
The gene encoding a extremely thermostable 4-$\alpha$-glucanotransferase from a hyperthermophilic archaeon, Thermococcus litoralis, was cloned, sequenced and expressed in Escherichia coli. The amino acid sequence of the enzyme was distantly related to other functionally-related ones, such as D-enzymes. The enzyme is of industrial interest because of a novel activity of producing cycloamylose and is also important for fundamental studies of protein, sugar-metabolizing enzymes. In this paper, the overexpression of 4-$\alpha$-glucanotransferase in E. coli was carried out expression vector system with lac and T7 promoters. The enzyme was successfully overexpressed, and purified by the heat treatment of a cell-free extract, successive Butyl-Toyopearl and Mono Q chromatographies. The purified recombinant enzyme showed the same specific activity and the same mobility in SDS-PAGE as natural enzyme.
Keywords
Overexpression; 4-$\alpha$-Glucanotransferase; Hyperthermophilic archaeon; Thermococcus litoralis; Thermostable enzyme;
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