Regulatory elements downstream of the promoter of an rRNA gene of E. coli.
Previously we have shown that plasmid constructs carrying a reporter gene fused to the P2 promoter of the E. coli rrnB gene exhibited a strange two-phase kinetics of expression depending on the physiological conditions of the cell if a short DNA region downstream of the promoter was present between the promoter and the reporter gene (Lukacsovich et al. (1987) J. Bacteriol. 169, 272-277). Insertion of a synthetic oligonucleotide corresponding to the first half of this region into constructs where the reporter directly follows the promoter, leads to a complete block of expression in vivo, while in vitro--in a purified system--transcription is not inhibited. Band-shift experiments indicate that the putative regulatory region downstream of the promoter specifically binds protein(s) present in total bacterial extracts.
Institute of Biochemistry, Biological Research Center, Szeged Hungary.
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Csiszár
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Lukacsovich
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P
Venetianer
D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005798:Genes, Bacterial; D005809:Genes, Regulator; D007700:Kinetics; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012335:RNA, Ribosomal / Q000235:genetics*; D014158:Transcription, Genetic
D004268:DNA-Binding Proteins; D015345:Oligonucleotide Probes; D012335:RNA, Ribosomal