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Nucleic Acids Research, 1990, Vol. 18, No. 21 6271-6275
© 1990

MOLECULAR BIOLOGY

The signal for growth rate control and stringent sensitivity in E. coli is not restricted to a particular sequence motif within the promoter region

M. Zacharias, H.U. Göringer+, and R. Wagner1,*

Max-Planck-lnstitut für Molekulare Genetik, Abteilung Wittmann Ihnestraße 73, D-1000 Berlin 33 1Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1 D-4000 Düsseldorf 1, FRG

*To whom correspondence should be addressed

Received July 27, 1990. Revised October 2, 1990. Accepted October 2, 1990.

Hybrid promoter constructs were used to determine the DNA sequence requirements for stringent and growth rate control within a promoter region. The promoters were obtained by fusing complementing sequence regions located upstream and downstream from the GCGC discriminator motif of the growth rate regulated rRNA P1 promoter and a non-regulated tac promoter variant. The activities and the regulatory response of the hybrid promoters were determined in vivo; using a promoter test vector system with the chloramphenlcol acetyltransferase (CAT) reporter gene. Measurements were made at different growth rates and after starvation for isoleucine to induce the stringent response. Neither the upstream nor the downstream sequence of P1 relative to the GCGC discriminator motif conferred comparable regulatory features when fused to the complementing sequences of the non-regulated mutant tac promoter. A minor response to amlno acid deprivation or changes in the growth rate was noted for the hybrid promoter with the rrnB P1 upstream segment and the tac downstream element, pointing to a slightly different importance of the two sequence elements for regulation. The parallel effects for stringent as well as growth rate regulation of the hybrid promoters supports the view of a common mechanism for both types of control. However, none of the promoter sequence elements on its own was able to restore the complete regulatory behaviour of their ‘parentRsquo; promoters.

+Present address: Seattle Biomedical Research Institute, 4 Niclcerson Street, Seattle, WA 98109-1651, USA


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