Journal
BIOCHEMICAL ENGINEERING JOURNAL
Volume 28, Issue 1, Pages 17-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2005.08.037
Keywords
Escherichia coli; self-disruption; D-amino acid oxidase; T7 lysozyme; green fluorescent protein
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Recombinant Escherichia coli with self-disruption characteristic was developed. The cell harbored a D-amino acid oxidase (DAAO) expressing plasmid resulted in an obvious self-disruption. When T7 lysozyme instead of DAAO was used as a lysis gene. no appreciable self-disruption was observed. In the presence of two compatible plasmids, which expressed DAAO and T7 lysozyme, respectively, E. coli BL21 (DE3) showed a significant self-disruption. A lysis plasmid containing both inducible DAAO and constitutive T7 lysozyme genes were, therefore, constructed to make the transformed cells self-disrupt more effectively. Green fluorescent protein (GFP), a model target protein, was co-expressed in this self-disruptive E. coli cell. About 60% of the cells were self-disrupted when the lysis genes were induced by isopropyl thiogalactoside (IPTG). The cell disruption efficiency reached to 90% after freeze/thawing treatment. (c) 2005 Elsevier B.V. All rights reserved.
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