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 Previous Article

Journal of Bacteriology, May 1999, p. 3310-3316, Vol. 181, No. 10
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

NahY, a Catabolic Plasmid-Encoded Receptor Required for Chemotaxis of Pseudomonas putida to the Aromatic Hydrocarbon Naphthalene

Ann C. Grimmdagger and Caroline S. Harwood*

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

Received 13 January 1999/Accepted 8 March 1999

Pseudomonas putida G7 exhibits chemotaxis to naphthalene, but the molecular basis for this was not known. A new gene, nahY, was found to be cotranscribed with meta cleavage pathway genes on the NAH7 catabolic plasmid for naphthalene degradation. The nahY gene encodes a 538-amino-acid protein with a membrane topology and a C-terminal region that resemble those of chemotaxis transducer proteins. A P. putida G7 nahY mutant grew on naphthalene but was not chemotactic to this aromatic hydrocarbon. The protein NahY thus appears to function as a chemoreceptor for naphthalene or a related compound. The presence of nahY on a catabolic plasmid implies that chemotaxis may facilitate biodegradation.

* Corresponding author. Mailing address: Department of Microbiology, The University of Iowa, Iowa City, IA 52242. Phone: (319) 335-7783. Fax: (319) 335-7679. E-mail: caroline-harwood{at}uiowa.edu.

dagger Present address: National Exposure Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, OH 45268.

Journal of Bacteriology, May 1999, p. 3310-3316, Vol. 181, No. 10
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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