Abstract
The expression of different Escherichia coli transcription units is tightly regulated at the level of transcription initiation. Promoter strength is fixed by DNA sequence elements, and changes in promoter activity are primarily modulated by a combination of sigma factors and transcription factors, whose activities are controlled by the growth environment. These factors all operate in the context of bacterial chromatin which plays a key role in the expression of many transcription units. Here we describe how IHF and FIS intervene directly at some complex Escherichia coli promoters to bring about different regulatory outcomes. At the nir operon promoter, the binding of IHF and FIS together makes expression co-dependent on two transcription activators that are triggered by two different environmental signals. We discuss three different mechanisms by which FIS represses promoter activity, thereby down-regulating gene expression during rapid growth. At the nrf operon promoter, FIS behaves as a conventional repressor, at the ogt and acs promoters, FIS displaces the essential activator, whilst, at the dps promoter, FIS jams RNA polymerase containing σ70 in an inactive complex. In each of the three cases, derepression occurs when FIS levels drop, as cell growth slows in response to nutrient limitation. Genomic studies of the distribution of IHF and FIS across the Escherichia coli chromosome suggest that they intervene at many intergenic regulatory regions, and that there may be little or no distinction between some nucleoid-associated proteins and transcription factors.
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Work in the authors’ laboratory has been supported by the Wellcome Trust and the UK BBSRC.
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Browning, D.F., Grainger, D.C., Xu, M., Busby, S.J.W. (2010). Transcriptional Regulation by Nucleoid-Associated Proteins at Complex Promoters in Escherichia coli . In: Dame, R.T., Dorman, C.J. (eds) Bacterial Chromatin. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3473-1_18
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