We have developed a number of broad-host-range plasmids that allow the expression of the Escherichia coli lac operon from any cloned promoter, and the creation of ‘in phase’ fusions between lacZ and other cloned genes. In a second series of constructions, the E. coli gal operon has been cloned into the broad-host-range vector and a plasmid carrying both the E. coli gal and lac genes is described. These plasmids have been transferred into Pseudomonas aeruginosa and Zymomonas mobilis and their effects on the utilisation of lactose and galactose have been investigated.
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Lodge et al. (1992) studied this question.
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