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Journal of Bacteriology, October 1998, p. 5375-5383, Vol. 180, No. 20
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Escherichia coli Promoters with UP Elements of Different Strengths: Modular Structure of Bacterial Promoters

Wilma Ross, Sarah E. Aiyar, Julia Salomon, and Richard L. Gourse*

Department of Bacteriology, University of Wisconsin---Madison, Madison, Wisconsin 53706

Received 3 June 1998/Accepted 17 August 1998

The alpha  subunit of Escherichia coli RNA polymerase (RNAP) participates in promoter recognition through specific interactions with UP element DNA, a region upstream of the recognition hexamers for the sigma  subunit (the -10 and -35 hexamers). UP elements have been described in only a small number of promoters, including the rRNA promoter rrnB P1, where the sequence has a very large (30- to 70-fold) effect on promoter activity. Here, we analyzed the effects of upstream sequences from several additional E. coli promoters (rrnD P1, rrnB P2, lambda  pR, lac, merT, and RNA II). The relative effects of different upstream sequences were compared in the context of their own core promoters or as hybrids to the lac core promoter. Different upstream sequences had different effects, increasing transcription from 1.5- to ~90-fold, and several had the properties of UP elements: they increased transcription in vitro in the absence of accessory protein factors, and transcription stimulation required the C-terminal domain of the RNAP alpha  subunit. The effects of the upstream sequences correlated generally with their degree of similarity to an UP element consensus sequence derived previously. Protection of upstream sequences by RNAP in footprinting experiments occurred in all cases and was thus not a reliable indicator of UP element strength. These data support a modular view of bacterial promoters in which activity reflects the composite effects of RNAP interactions with appropriately spaced recognition elements (-10, -35, and UP elements), each of which contributes to activity depending on its similarity to the consensus.

* Corresponding author. Mailing address: Department of Bacteriology, University of Wisconsin---Madison, 1550 Linden Dr., Madison WI 53706. Phone: (608) 262-9813. Fax: (608) 262-9865. E-mail: rgourse{at}bact.wisc.edu.

Journal of Bacteriology, October 1998, p. 5375-5383, Vol. 180, No. 20
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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