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Journal of Bacteriology, January 2008, p. 428-433, Vol. 190, No. 1
0021-9193/08/$08.00+0     doi:10.1128/JB.01431-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Substitutions at Auxiliary Operator O3 Enhance Repression by Nitrate-Responsive Regulator NarL at Synthetic lac Control Regions in Escherichia coli K-12{triangledown}

Valley Stewart* and Peggy J. Bledsoe

Section of Microbiology, University of California, Davis, California 95616-8665

Received 4 September 2007/ Accepted 14 October 2007

We constructed monocopy lac operon control regions in which the operators O1-lac and O3-lac were replaced by NarL and NarP binding sites from the nirB or napF operon control regions. The results support the hypothesis that DNA-bound dimers of phospho-NarL can participate in higher-order cooperative interactions.

* Corresponding author. Mailing address: Section of Microbiology, University of California, One Shields Avenue, Davis CA 95616-8665. Phone: (530) 754-7994. Fax: (530) 752-9014. E-mail: vjstewart{at}ucdavis.edu

{triangledown} Published ahead of print on 26 October 2007.

Journal of Bacteriology, January 2008, p. 428-433, Vol. 190, No. 1
0021-9193/08/$08.00+0     doi:10.1128/JB.01431-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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