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Journal of Bacteriology, January 2003, p. 688-692, Vol. 185, No. 2
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.2.688-692.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Isolation of a Negative Control Mutant of the Nitrogen Assimilation Control Protein, NAC, in Klebsiella aerogenes

Brian K. Janes, Christopher J. Rosario, and Robert A. Bender*

Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109-1048

Received 4 October 2002/ Accepted 24 October 2002

A negative control mutant of the nitrogen assimilation control protein, NAC, has been isolated. Mutants with the leucine at position 111 changed to a nonhydrophobic residue activate transcription from hut and ure promoters, but fail to repress gdhA expression. This failure does not result from failure to bind to either of the two sites required for gdhA repression, but the binding at those sites is altered in the mutant. It appears that the NAC negative control mutants fail to form the complex structures (probably tetramers) formed by wild-type NAC at the gdhA promoter.

* Corresponding author. Mailing address: Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-1048. Phone: (734) 936-2530. Fax: (734) 647-0884. E-mail: rbender{at}umich.edu.

Journal of Bacteriology, January 2003, p. 688-692, Vol. 185, No. 2
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.2.688-692.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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