The construction of a shuttle vector for inducible gene expression allowing fast and easy cloning in Escherichia coli and subsequent transformation of Bacillus subtilis is presented. The expression is based on the regulation of the tac promoter by the Lac repressor which was assayed with the xylE gene from Pseudomonas putida as a marker gene. The lacIq gene, transcribed by the strong spo promoter, allowed full repression of the weak tac promoter.
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Leonhardt et al. (1988) studied this question.
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