Abstract
Direct efficient facile screening of bacterial transformants with the goal of selecting, retrieving, and using recombinant DNA is exemplified by simple visual-based colorimetric inspections or fluorescent protein-based assays. We describe pRedScript, which introduces the constitutive expression of a very bright red fluorescent protein into transformants. On agar plates, red colonies are simply visualized in ambient white light in stark contrast to recombinant transformants that are white. In addition, the bright red fluorescence of the reporter protein can also be harnessed as a sensitive signal for screening bacterial promoters during the development of optimized fermentation conditions.
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