PMID:2207161

Citation	Zengel, JM and Lindahl, L (1990) Mapping of two promoters for elongation factor Tu within the structural gene for elongation factor G. Biochim. Biophys. Acta 1050:317-22
Abstract	The str operon of Escherichia coli contains the genes for ribosomal proteins S7 and S12 as well as elongation factors G and Tu (EF-G, EF-Tu). We have previously reported that there is a secondary promoter for expression of EF-Tu mapping within the upstream fus gene encoding EF-G (Zengel, J.M. and Lindahl, L. (1982) Mol. Gen. Genet. 185, 487-492) and have identified several potential promoter sequences within fus (Zengel, J.M., Archer, R.H. and Lindahl, L. (1984) Nucleic Acids Res. 12, 2181-2192). We have now further characterized this promoter activity. Measurements of transcription rates from various regions of the str operon in cells carrying the fus gene and the beginning of the tufA gene on a high copy number plasmid confirmed that transcription was initiated within a 600 bp EcoRI fragment in the distal portion of the fus gene. Furthermore, T1 nuclease mapping studies identified two 5' ends within this region, one about 400 bases upstream of tufA, the other about 270 bases upstream, suggesting that there are two tufA promoters within the fus gene. Both of these promoters are active in the intact chromosomal str operon.
Links	PubMed
Keywords	Escherichia coli/genetics; Genes, Bacterial; Operon; Peptide Elongation Factor G; Peptide Elongation Factor Tu/genetics; Peptide Elongation Factors/genetics; Plasmids; Promoter Regions, Genetic; Restriction Mapping; Ribosomal Proteins/genetics
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