Effects of FIS protein on rnpB transcription in Escherichia coli.
Factor for inversion stimulation (FIS), the Escherichia coli protein, is a positive regulator of the transcription of genes that encode stable RNA species, such as rRNA and tRNA. Transcription of the rnpB gene encoding M1 RNA, the catalytic subunit of E. coli RNase P, rapidly declines under stringent conditions, as does that of other stable RNAs. There are multiple putative FIS binding sites upstream of the rnpB promoter. We tested whether FIS binds to these sites, and if so, how it affects rnpB transcription. In vitro binding assays revealed specific binding of FIS to multiple sites in the rnpB promoter region. Interestingly, FIS bound not only to the upstream region of the promoter, but also to the region from +4 to +18. FIS activated rnpB transcription in vitro, but the level of activation was much lower than that of the rrnB promoter for rRNA. We also examined the effects of FIS on rnpB transcription in vivo using isogenic fis+ and fis- strains. rnpB transcription was higher in the fis- than the fis+ cells during the transitions from lag to exponential phase, and from exponential to stationary phase.
Choi
Hyun-Sook
HS
Department of Chemistry and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology, Daejeon, Korea.
Kim
Kwang-Sun
KS
Park
Jeong Won
JW
Jung
Young Hwan
YH
Lee
Younghoon
Y
D001483:Base Sequence; D001665:Binding Sites; D018983:DNA Footprinting; D024202:Electrophoretic Mobility Shift Assay; D004926:Escherichia coli / Q000166:cytology / Q000235:genetics; D029968:Escherichia coli Proteins / Q000235:genetics*; D035021:Factor For Inversion Stimulation Protein / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011485:Protein Binding; D012329:RNA, Bacterial / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics*; D015533:Transcriptional Activation
D029968:Escherichia coli Proteins; D035021:Factor For Inversion Stimulation Protein; D012329:RNA, Bacterial