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Applied and Environmental Microbiology, March 2008, p. 1642-1645, Vol. 74, No. 5
0099-2240/08/$08.00+0     doi:10.1128/AEM.01878-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

cadDX Operon of Streptococcus salivarius 57.I{triangledown}

Yi-Ywan M. Chen,1* C. W. Feng,1 C. F. Chiu,1 and Robert A. Burne2

Department of Microbiology and Immunology, Chang Gung University, Tao-Yuan, Taiwan, Republic of China,1 Department of Oral Biology, University of Florida, Gainesville, Florida2

Received 15 August 2007/ Accepted 19 December 2007

A CadDX system that confers resistance to Cd2+ and Zn2+ was identified in Streptococcus salivarius 57.I. Unlike with other CadDX systems, the expression of the cad promoter was negatively regulated by CadX, and the repression was inducible by Cd2+ and Zn2+, similar to what was found for CadCA systems. The lower G+C content of the S. salivarius cadDX genes suggests acquisition by horizontal gene transfer.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan. Phone: 886-3-2118800, ext. 3352. Fax: 886-3-2118700. E-mail: mchen{at}mail.cgu.edu.tw

{triangledown} Published ahead of print on 28 December 2007.

Applied and Environmental Microbiology, March 2008, p. 1642-1645, Vol. 74, No. 5
0099-2240/08/$08.00+0     doi:10.1128/AEM.01878-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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