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http://dx.doi.org/10.5352/JLS.2007.17.1.132

Enhancement of Soluble Expression of Alginate Lyase By Molecular Chaperone in E. coli.  

Shin, Eun-Jung (Department of Biomaterial Control, Dong-Eui University)
Lee, Jae-Hyung (Department of Biomaterial Control, Dong-Eui University)
Park, So-Lim (BioLeaders Corp.)
Kim, Hyeung-Rak (Division of Food Science and Biotechnology, Pukyong National University)
Nam, Soo-Wa (Department of Biomaterial Control, Dong-Eui University)
Publication Information
Journal of Life Science / v.17, no.1, 2007 , pp. 132-136 More about this Journal
Abstract
When alginate lyase gene (aly) from Pseudoalteromonas elyakovii was expressed in E. coli, most of the gene product was produced as aggregated insoluble particles known as inclusion bodies. In order to produce a soluble and active form of alginate lyase, E. coli cells fore cotransformed with the plasmids designed to permit coexpression of aly together with molecular chaperones such as DnaK/DnaJ/GrpE or GroEL/ES chaperones. The results revealed that the coexpression of aly together with DnaK/DnaJ/GrpE chaperone had a marked effect on the production of this protein as a soluble and active form, presumably through facilitating correct folding of alginate lyase protein. The optimal concentration of L-arabinose for the induction of DnaK/DnaJ/GrpE chaperone was found to be 0.05 mg/ml. When DnaK/DnaJ/GrpE chaperone was coexpressed, about 34% in the total alginate lyase was produced in the soluble fraction. By addition of 10% cetylpyridinium chloride, a clear zone around the colony coexpressing aly and DnaK/DnaJ/GrpE chaperone was formed, indicating that the alginate in the medium was hydrolyzed by active alginate lyase enzyme.
Keywords
Alginate lyase; molecular chaperone; coexpression; E. coli;
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