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Journal of Bacteriology, August 2001, p. 4860-4865, Vol. 183, No. 16
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.16.4860-4865.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Conserved Promoter Motif Is Required for Cell Cycle Timing of dnaX Transcription in Caulobacter

Kenneth C. Keiler and Lucy Shapiro*

Department of Developmental Biology, Stanford University, Stanford, California 94305

Received 11 April 2001/Accepted 30 May 2001

Cells use highly regulated transcriptional networks to control temporally regulated events. In the bacterium Caulobacter crescentus, many cellular processes are temporally regulated with respect to the cell cycle, and the genes required for these processes are expressed immediately before the products are needed. Genes encoding factors required for DNA replication, including dnaX, dnaA, dnaN, gyrB, and dnaK, are induced at the G1/S-phase transition. By analyzing mutations in the dnaX promoter, we identified a motif between the -10 and -35 regions that is required for proper timing of gene expression. This motif, named RRF (for repression of replication factors), is conserved in the promoters of other coordinately induced replication factors. Because mutations in the RRF motif result in constitutive gene expression throughout the cell cycle, this sequence is likely to be the binding site for a cell cycle-regulated transcriptional repressor. Consistent with this hypothesis, Caulobacter extracts contain an activity that binds specifically to the RRF in vitro.

* Corresponding author. Mailing address: Department of Developmental Biology, Stanford University, Stanford, CA 94305. Phone: (650) 725-7678. Fax: (650) 725-7739. E-mail: shapiro{at}cmgm.stanford.edu.

Journal of Bacteriology, August 2001, p. 4860-4865, Vol. 183, No. 16
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.16.4860-4865.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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