Journal of Bacteriology, January 2001, p. 382-386, Vol. 183, No. 1
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.1.382-386.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
andDepartment of Microbiology and Graduate Program in Molecular Biology, University of Iowa, Iowa City, Iowa 52242
Received 9 June 2000/Accepted 27 September 2000
LuxR is the transcriptional activator for quorum-sensing control of luminescence in Vibrio fischeri. A series of alanine-scanning mutants spanning a predicted helix-turn-helix region in the DNA binding domain of LuxR was constructed, and the activity of each of the LuxR mutant proteins in recombinant Escherichia coli was investigated. The region covered by the mutagenesis spanned residues 190 to 224. About half of the alanine-scanning mutants showed activities similar to that of the wild-type LuxR: at least two were positive-control mutants, four appeared to be defective in DNA binding, and several others were characterized as DNA binding affinity mutants. This analysis, taken together with information about other bacterial transcription factors, provides insights into amino acid residues in LuxR that are involved in DNA binding and transcriptional activation.
Present address: Laboratory of Molecular Biology, National Cancer
Institute, National Institutes of Health, Bethesda, MD 20892.
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