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- W2130342394 abstract "ABSTRACT When an Escherichia coli culture changes from exponential growth to the stationary phase, expression of growth-related genes levels off, while a number of stationary-phase-specific genes are turned on. To gain insight into the growth phase-dependent global regulation of genome transcription, we analyzed the strength and specificity of promoters associated with the stationary-phase genes. For the in vivo assay of promoter activity, 300- to 500-bp DNA fragments upstream from the translation initiation codon were isolated and inserted into a newly constructed doubly fluorescent protein (DFP) vector. The activity of test promoters was determined by measuring the green fluorescent protein (GFP). To avoid the possible influence of plasmid copy number, the level of transcription of reference promoter lac UV5 on the same plasmid was determined by measuring the red fluorescent protein (RFP). Thus, the activities of test promoters could be easily and accurately determined by determining the GFP/RFP ratio. Analysis of the culture time-dependent variation of 100 test promoters indicated that (i) a major group of the stationary-phase promoters are up-regulated only in the presence of RpoS sigma; (ii) the phase-coupled increase in the activity of some promoters takes place even in the absence of RpoS; and (iii) the activity of some promoters increases in the absence of RpoS. This classification was confirmed by testing in vitro transcription by using reconstituted RpoD and RpoS holoenzymes." @default.
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- W2130342394 date "2004-11-01" @default.
- W2130342394 modified "2023-10-17" @default.
- W2130342394 title "Classification and Strength Measurement of Stationary-Phase Promoters by Use of a Newly Developed Promoter Cloning Vector" @default.
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- W2130342394 doi "https://doi.org/10.1128/jb.186.21.7112-7122.2004" @default.
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