cadDX Operon of Streptococcus salivarius 57.I
- 1 March 2008
- journal article
- research article
- Published by American Society for Microbiology in Applied and Environmental Microbiology
- Vol. 74 (5), 1642-1645
- https://doi.org/10.1128/aem.01878-07
Abstract
A CadDX system that confers resistance to Cd(2+) and Zn(2+) 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 Cd(2+) and Zn(2+), 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.Keywords
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