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J. Bacteriol., 08 1995, 4813-4816, Vol 177, No. 16
Copyright © 1995, American Society for Microbiology

Bacillus subtilis gnt repressor mutants that diminish gluconate-binding ability

K Yoshida, H Ohmori, Y Miwa and Y Fujita
Department of Biotechnology, Faculty of Engineering, Fukuyama University, Hiroshima, Japan.

The Bacillus subtilis gnt operon is negatively regulated by GntR, which is antagonized by gluconate. Three GntR mutants with diminished gluconate-binding ability were obtained. Two were missense mutants (Met- 209 to Ile and Ser-230 to Leu), whereas the third had a deletion of the C-terminal 23 amino acids. The mutant GntR proteins were unable to become properly detached from the gnt operator even in the presence of gluconate.


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