NDLI: CcpC-Dependent Regulation of Citrate Synthase Gene Expression in Listeria monocytogenes ▿

Content Provider	PubMed Central
Author	Mittal, Meghna Silvia, Picossi Sonenshein, Abraham L.
Abstract	Citrate synthase, the first and rate-limiting enzyme of the tricarboxylic acid branch of the Krebs cycle, was shown to be required for de novo synthesis of glutamate and glutamine in Listeria monocytogenes. The citrate synthase (citZ) gene was found to be part of a complex operon with the upstream genes lmo1569 and lmo1568. The downstream isocitrate dehydrogenase (citC) gene appears to be part of the same operon as well. Two promoters were shown to drive citZ expression, a distal promoter located upstream of lmo1569 and a proximal promoter located upstream of the lmo1568 gene. Transcription of citZ from both promoters was regulated by CcpC by interaction with a single site; assays of transcription in vivo and assays of CcpC binding in vitro revealed that CcpC interacts with and represses the proximal promoter that drives expression of the lmo1568, citZ, and citC genes and, by binding to the same site, prevents read-through transcription from the distal, lmo1569 promoter. Expression of the lmo1568 operon was not affected by the carbon source but was repressed during growth in complex medium by addition of glutamine.
Related Links	http://dx.doi.org/10.1128/jb.01384-08
Ending Page	872
Page Count	11
Starting Page	862
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	3
Volume Number	191
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2009-02-01
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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