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Transformation of Edwardsiella tarda and Transcriptional Characteristics of E-lysis Gene in Recombinant Bacterial Ghosts  

Kwon, Se Ryun (Department of Aquatic Life Medicine, Pukyong National University)
Nam, Yoon Kwon (Department of Aquaculture, Pukyong National University)
Publication Information
Korean Journal of Ichthyology / v.19, no.2, 2007 , pp. 83-87 More about this Journal
Abstract
Edwardsiella tarda, a gram (-) pathogen causing edwardsiellosis in farmed fish, was transformed via electroporation with a plasmid expression vector driving the PhiX174 E-lysis gene under the transcriptional control by lambda PR regulatory sequence. The persistent maintenance of the plasmid vector in recombinant E. tarda was found in numerous subculture procedures over up to 6 months without any adverse effect on the original copy number of plasmids. Comparative examination based on semi-quantitative RT-PCR analysis on transcriptional efficiency of E-lysis gene between recombinant E. coli and E. tarda indicated that promoter strength and induction capacity of bacterial ghosts would be retarded in E. tarda as compared to the E. coli. However, the completeness of induction for bacterial ghosts in E. tarda was the same with E. coli, in which at least 99.99% of induction rate was possible and further the viability of recombinant bacteria was completely eliminated by a post-induction procedure including washing and freeze drying lyophilization.
Keywords
Edwardsiella tarda; transformation; bacterial ghosts; gene expression;
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