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Journal of Bacteriology, September 1998, p. 4865-4871, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Mutational Analysis of the Transcriptional Regulator GcvA: Amino Acids Important for Activation, Repression, and DNA Binding

Alissa D. Jourdan and George V. Stauffer*

Department of Microbiology, The University of Iowa, Iowa City, Iowa 52242

Received 6 April 1998/Accepted 22 July 1998

The GcvA protein is required for both glycine-mediated activation and purine-mediated repression of the gcvTHP operon. Random and site-directed PCR mutagenesis was used to create nucleotide changes in gcvA to identify residues of the protein involved in activation, repression, and DNA binding. Single amino acid substitutions at L30 and F31 cause a defect in activation of a gcvT-lacZ fusion but have no effect on repression or DNA binding. Single amino acid substitutions at V32 and S38 cause the loss of binding of GcvA to DNA. A deletion of the carboxy-terminal 14 amino acids of GcvA results in the loss of purine-mediated repression and, consequently, a constitutive activation of a gcvT-lacZ fusion. The results of this study partially define regions of GcvA involved in activation, repression, and DNA binding and demonstrate that these functions of GcvA are genetically separable.

* Corresponding author. Mailing address: Department of Microbiology, The University of Iowa, Iowa City, IA 52242. Phone: (319) 335-7791. Fax: (319) 335-9006. E-mail: george-stauffer{at}uiowa.edu.

Journal of Bacteriology, September 1998, p. 4865-4871, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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