The “instant evolution” system was initially developed in E. coli, primarily because of the ease with which this organism can be genetically manipulated. Because many of the functionally important regions of rRNA are conserved among bacteria, drug leads developed against conserved targets in the E. coli system may produce broad-spectrum anti-infectives. However, in order the develop a system to product narrow-spectrum anti-infectives, herein we disclose method and compositions for screening Pseudomonas aeruginosa 16S rRNA in E. coli cells. In certain embodiments, a plasmid comprising the 16S rRNA gene from Pseudomonas aeruginosa t mutated to replace the natural helix 9 region with the corresponding region of the E. coli rRNA, is shown to form functional ribosomes in E. coli host cells. Li other embodiments, a plasmid, comprising the unmutated 16S rRNA from Pseudomonas aeruginosa, along with a plasmid containing the Pseudomonas aeruginosa S20 protein, can yield functional ribosomes in E. coli cells.
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