NDLI: Target Genes, Consensus Binding Site, and Role of Phosphorylation for the Response Regulator MtrA of Corynebacterium glutamicum ▿ †

Content Provider	PubMed Central
Author	Brocker, Melanie Mack, Christina Bott, Michael
Copyright Year	2011
Abstract	The two-component signal transduction system consisting of the sensor kinase MtrB and the response regulator MtrA is highly conserved in corynebacteria and mycobacteria. Whereas mtrA of Mycobacterium tuberculosis was reported to be essential, we recently succeeded in creating ΔmtrAB and ΔmtrA deletion mutants of Corynebacterium glutamicum and provided evidence that mepA and nlpC, both encoding putative cell wall peptidases, are directly repressed by MtrA, whereas proP and betP, both encoding carriers for compatible solutes, are directly activated by MtrA. In the present study, novel MtrA target genes were identified, including mepB, encoding another putative cell wall peptidase. The repressor or activator functions of MtrA correlate with the distance between the MtrA binding site and the transcriptional start site. From the identified binding sites within 20 target promoters, a 19-bp MtrA consensus motif was derived which represents a direct repeat of 8 base pairs separated by 3 base pairs. Gene expression of a strain containing MtrA with a D53N mutation instead of wild-type MtrA resembled that of a ΔmtrA mutant, indicating that MtrA is active in its phosphorylated form. This result was confirmed by electrophoretic mobility shift assays with phosphorylated MtrA which showed an increased binding affinity.
Related Links	http://dx.doi.org/10.1128/jb.01032-10
Ending Page	1249
Page Count	13
Starting Page	1237
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	5
Volume Number	193
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2011-03-01
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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