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Journal of Bacteriology, August 2002, p. 4296-4300, Vol. 184, No. 15
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.15.4296-4300.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The Chloramphenicol-Inducible catB Gene in Agrobacterium tumefaciens Is Regulated by Translation Attenuation{dagger}

Elizabeth J. Rogers,1 M. Sayeedur Rahman,1,{ddagger} Russell T. Hill,2 and Paul S. Lovett1*

Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, Maryland 21250,1 Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore, Maryland 212022

Received 4 February 2002/ Accepted 3 May 2002

Agrobacterium tumefaciens strains C58, A136, and BG53 are chloramphenicol resistant, and each contains the catB gene originally identified by Tennigkeit and Matzuran (Gene 99:113-116, 1991). The chloramphenicol acetyltransferase activity in all of the strains is chloramphenicol inducible. Examination of the catB gene in strain BG53 indicates that it is regulated by an attenuation mechanism similar to translation attenuation that regulates inducible catA genes resident in gram-positive bacteria and the inducible cmlA gene that confers chloramphenicol resistance in Pseudomonas spp.

* Corresponding author. Mailing address: Department of Biological Sciences, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250. Phone: (410) 455-2249. Fax: (410) 455-3574. E-mail: lovett{at}umbc.edu.

{dagger} Contribution no. 570 from the Center of Marine Biotechnology.

{ddagger} Present address: Department of Microbiology and Immunology, University of Maryland Medical Center, Baltimore, MD 21201.

Journal of Bacteriology, August 2002, p. 4296-4300, Vol. 184, No. 15
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.15.4296-4300.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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