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Journal of Bacteriology, June 2000, p. 3289-3291, Vol. 182, No. 11
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Transformation of Rickettsia prowazekii to Erythromycin Resistance Encoded by the Escherichia coli ereB Gene

Lyudmila I. Rachek, Andria Hines, Aimee M. Tucker, Herbert H. Winkler, and David O. Wood*

Department of Microbiology and Immunology, Laboratory of Molecular Biology, University of South Alabama College of Medicine, Mobile, Alabama 36688

Received 12 January 2000/Accepted 10 March 2000

Rickettsia prowazekii, the etiologic agent of epidemic typhus, is an obligate, intracytoplasmic, parasitic bacterium. Recently, the transformation of this bacterium via electroporation has been reported. However, in these studies identification of transformants was dependent upon either selection of an R. prowazekii rpoB chromosomal mutation imparting rifampin resistance or expression of the green fluorescent protein and flow cytometric analysis. In this paper we describe the expression in R. prowazekii of the Escherichia coli ereB gene. This gene codes for an erythromycin esterase that cleaves erythromycin. To the best of our knowledge, this is the first report of the expression of a nonrickettsial, antibiotic-selectable gene in R. prowazekii. The availability of a positive selection for rickettsial transformants is an important step in the characterization of genetic analysis systems in the rickettsiae.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Laboratory of Molecular Biology, University of South Alabama College of Medicine, Mobile, AL 36688. Phone: (334) 460-6324. Fax: (334) 460-7269. E-mail: wood{at}sungcg.usouthal.edu.

Journal of Bacteriology, June 2000, p. 3289-3291, Vol. 182, No. 11
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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