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We have characterized the promoter regions of the gtfB and gtfC genes from Streptococcus mutans GS-5. Using a plasmid-based reporter system, we discovered that the gtfC promoter is an order of magnitude stronger than the gtfB promoter. In addition, we found that a variety of growth conditions failed to affect or discriminate between the expression of the two promoters. Only during the various phases...
The utility of firefly luciferase as a reporter was tested in Streptococcus mutans. Under control of an endogenous promoter, the luciferase coding sequence was strongly expressed, while a promoterless version was indistinguishable from the background. Luciferase activity was easily extracted and the assay rapid and reproducible. In addition, the half-life of luciferase activity was found to be comparable...
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