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Expression of Plant Monellin in Escherichia coli Induced by Lactose |
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Abstract According to the amino acid sequence of monellin and the bias in coden choice in Escheria coli,a single chain monellin gene was synthesized and subcloned into a Escheria coli expression vector pET-28a. The recombined plasmid pET-28a-Mon was then transformed into Escheria coli BL21(DE3).Lactose was used as an inducer instead of IPTG.Through proper optimization of induction conditions,an expression level 33.09% of total cellular protein was achieved.The expression level of recombinant protein induced by lactose was basically the same as that induced by IPTG.The result indicated that lactose could be used an promising inducer in the production of recombined Monellin.
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Received: 07 September 2007
Published: 28 March 2008
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