1. Regulation of the Vibrio vulnificus vvpE expression by cyclic AMP-receptor protein and quorum-sensing regulator SmcR
- Author
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Kim, Choon-Mee and Shin, Sung-Heui
- Subjects
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VIBRIO vulnificus , *METALLOPROTEINASES , *GENE expression , *GENETIC mutation , *CYCLIC adenylic acid , *QUORUM sensing , *COMPLEMENTATION (Genetics) , *GENETIC regulation - Abstract
Abstract: In Vibrio vulnificus, cAMP-receptor protein (CRP) and the quorum-sensing regulator SmcR are simultaneously and cooperatively required for the metalloprotease vvpE gene expression, rather than sequentially in a regulatory cascade. However, this study shows a new temporal and functional sequence between the two factors in regulating vvpE expression. A crp mutation inhibited vvpE expression with growth impairment from early stage. In contrast, a smcR mutation inhibited vvpE expression only at the late stage with no effect on growth. A crp–smcR double mutation severely inhibited vvpE expression with growth impairment from early stage. The inhibited vvpE expression was restored only at the early stage by a crp single complementation, but not at all by a smcR complementation. These results indicate that CRP functions as an essential activator, whereas SmcR functions in the presence of CRP for full vvpE expression. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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