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The levansucrase gene (lsrA) from Rahnella aquatilis was strongly expressed in a constitutive manner in Escherichia coli when cloned into a pBluescript KS-based pRL1CP plasmid vector. The native promoter upstream of lsrA and the lacZ promoter cooperatively enhanced the expression of lsrA to a level that was comparable to that of the T7 promoter, which is used in commercial pET expression vector system...
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