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Journal of Bacteriology, April 2000, p. 2311-2313, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Broad-Specificity Multidrug Efflux Pump Requiring a Pair of Homologous SMR-Type Proteins

Donald L. Jack, Michael L. Storms, Jason H. Tchieu, Ian T. Paulsen, and Milton H. Saier Jr.*

Department of Biology, University of California at San Diego, La Jolla, California 92093-0116

Received 9 November 1999/Accepted 31 January 2000

The Bacillus subtilis genome encodes seven homologues of the small multidrug resistance (SMR) family of drug efflux pumps. Six of these homologues are paired in three distinct operons, and coexpression in Escherichia coli of one such operon, ykkCD, but not expression of either ykkC or ykkD alone, gives rise to a broad specificity, multidrug-resistant phenotype including resistance to cationic, anionic, and neutral drugs.


* Corresponding author. Mailing address: Department of Biology, University of California at San Diego, La Jolla, CA 92093-0116. Phone: (858) 534-4084. Fax: (858) 534-7108. E-mail: msaier{at}ucsd.edu.


Journal of Bacteriology, April 2000, p. 2311-2313, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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