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Journal of Bacteriology, June 1999, p. 3666-3673, Vol. 181, No. 12
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Role in Cell Permeability of an Essential Two-Component System in Staphylococcus aureus

Patrick K. Martin,* Tong Li,dagger DongXu Sun,Dagger Donald P. Biek, and Molly B. Schmid

Microcide Pharmaceuticals, Inc., Mountain View, California 94043

Received 2 February 1999/Accepted 5 April 1999

A temperature-sensitive lethal mutant of Staphylococcus aureus was found to harbor a mutation in the uncharacterized two-component histidine kinase (HK)-response regulator (RR) pair encoded by yycFG; orthologues of yycFG could be identified in the genomes of Bacillus subtilis and other gram-positive bacteria. Sequence analysis of the mutant revealed a point mutation resulting in a nonconservative change (Glu to Lys) in the regulator domain of the RR at position 63. To confirm that this signal transduction system was essential, a disrupted copy of either the RR (yycF) or the HK (yycG) was constructed with a set of suicide vectors and used to generate tandem duplications in the chromosome. Resolution of the duplications, leaving an insertion in either the yycF or the yycG coding region, was achieved only in the presence of an additional wild-type copy of the two open reading frames. Phenotypic characterization of the conditional lethal mutant showed that at permissive growth conditions, the mutant was hypersusceptible to macrolide and lincosamide antibiotics, even in the presence of the ermB resistance determinant. Other mutant phenotypes, including hypersensitivity to unsaturated long-chain fatty acids and suppression of the conditional lethal phenotype by high sucrose and NaCl concentrations, suggest that the role of the two-component system includes the proper regulation of bacterial cell wall or membrane composition. The effects of this point mutation are strongly bactericidal at the nonpermissive temperature, indicating that this pathway provides an excellent target for the identification of novel antibiotics.

* Corresponding author. Mailing address: Microcide Pharmaceuticals, Inc., 850 Maude Ave., Mountain View, CA 94043. Phone: (650) 428-1550. Fax: (650) 428-3550. E-mail: martin{at}microcide.com.

dagger Present address: PharmaNet, Inc., Blue Bell, PA 19422.

Dagger Present address: Iconix Pharmaceuticals, Inc., Mountain View, CA 94043.

Journal of Bacteriology, June 1999, p. 3666-3673, Vol. 181, No. 12
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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