NDLI: ComCED signal loop precisely regulates nlmC expression in Streptococcus mutans

Content Provider	Springer Nature Link
Author	Liu, Tianlei Xue, Shoubin Cai, Wenbo Liu, Xiaojing Liu, Xiaojuan Zheng, Rongrong Luo, Hongyan Qi, Wenhui
Copyright Year	2013
Abstract	The ComED two-component signal transduction system (TCSTS) and the exogenous CSP can provoke the competence development and mutacin production of Streptococcus mutans. More binding fashions of ComE with DNA are the molecular basis for the ComED TCSTS to play pleiotropic roles. The interaction of nlmC and comC in regulation makes the expression of nlmC different from that of nlmAB and the ComE molecular feature is shown in the regulation pattern of nlmC. By electrophoretic mobility shift assay, ComE binding sites were discoveried in PnlmC314 and PnlmC419 for the first time. In the wild-type background, the promoter activity of nlmC is not only stronger than that of nlmAB but also rushes to a peak value of 3,116.0 MU at the point of 100 min in liquid culture with no supply of exogenous CSP; the data indicate that the regulation of nlmC expression is charged in an known coordination mechanism. In the mutant background, by monitoring the promoter activity of nlmC and nlmAB, it is proved that they are both controlled directly by the ComED TCSTS. But the surprising result is the deletion of comC to make nlmC promoter lose its activity completely. Based on those data, it is deduced that Pnlm419, PnlmC314 and PnlmC, which comprise the nlmC regulating region, coordinate to incite nlmC expression and to make nlmC expression different from that of nlmAB because of a synergistic effect, whereas they also could inhibit comC expression by blocking the RNA polymerase moving through the binding of ComE with the comC encoding region.
Starting Page	31
Ending Page	38
Page Count	8
File Format	PDF
ISSN	15904261
Journal	Annals of Microbiology
Volume Number	64
Issue Number	1
e-ISSN	18692044
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-03-22
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Streptococcus mutans Mutacins Electrophoretic mobility shift assay Beta-Galactosidase Microbiology Microbial Genetics and Genomics Microbial Ecology Fungus Genetics Medical Microbiology Applied Microbiology
Content Type	Text
Resource Type	Article
Subject	Applied Microbiology and Biotechnology

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