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http://dx.doi.org/10.5352/JLS.2004.14.1.121

Enhancement of Soluble Expression of CGTase in E. coli By Chaperone Molecules and Low Temperature Cultivation.  

박소림 (부경대학교 생물공학과)
김성구 (부경대학교 생물공학과)
권미정 (네오팜)
남수완 (동의대학교 생명공학과)
Publication Information
Journal of Life Science / v.14, no.1, 2004 , pp. 121-125 More about this Journal
Abstract
The synergistic effect of lowered incubation temperature and CroEL/ES expression on the production of soluble form of B. macerans cyclodextrin glucanotransferase (CGTase) was studied in recombinant E. coli. pTCGTl and pGroll carrying the cgt and groEL/ES genes under the control of T7 promoter and pzt-I promoter, respectively, were co-introduced. Tetracycline (10 ng/ml) and IPTG (1 mM) were added at the early-exponential phase (2 hr) and mid-exponential phase (3 hr). Low temperature cultivation at $25^{\circ}C$ with groEL/ES expression improved the activity of CGTase by two fold, compared to $37^{\circ}C$ cultivation without chaperones. SDS-PACE analysis revealed that about 69% of CGTase in the total CGTase protein was found in the soluble fraction by overexpression of GroEL/ES and cultivation at$25^{\circ}C$, whereas 20% of CGTase was detected in the soluble fraction when E. coli was cultivated at $37^{\circ}C$ without chaperone. The amount of soluble CGTase from $25^{\circ}C$ culture with chaperone was 3.5-fold higher than that of $37^{\circ}C$ culture without chaperone. Therefore the expression of CroEL/ES and low temperature cultivation greatly enhanced the soluble production of CGTase in E. coli.
Keywords
low temperature cultivation; CGTase; GroEL/ES; Escherichia coli;
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Times Cited By KSCI : 4  (Citation Analysis)
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