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The UP Element Is Necessary but Not Sufficient for Growth Rate-Dependent Control of the Escherichia coli guaB Promoter ^,

School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield S10 2RX, United Kingdom

Received 30 October 2007/ Accepted 9 January 2008

The Escherichia coli guaB promoter (P_guaB) regulates the transcription of two genes, guaB and guaA, that are required for de novo synthesis of GMP, a precursor for the synthesis of guanine nucleoside triphosphates. The activity of P_guaB is subject to growth rate-dependent control (GRDC). Here we show that the A+T-rich sequence located between positions –59 and –38 relative to the guaB transcription start site stimulates transcription from P_guaB 8- to 10-fold and, in common with other UP elements, requires the C-terminal domain of the RNA polymerase subunit for activity. Like the rrnB P1 UP element, the P_guaB UP element contains two independently acting subsites located at positions –59 to –47 and –46 to –38 and can stimulate transcription when placed upstream of the lacP1 promoter. We reveal a novel role for the P_guaB UP element by demonstrating that it is required for GRDC. The involvement of the UP element in GRDC also requires the participation of sequences located at least 100 bp upstream of the guaB transcription start site. These sequences are required for down-regulation of P_guaB activity at lower growth rates.

Published ahead of print on 18 January 2008.

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