NDLI: The stringent response, σH-dependent gene expression and sporulation in Bacillus subtilis

Content Provider	Springer Nature Link
Author	Eymann, C. Mittenhuber, G. Hecker, M.
Copyright Year	2000
Abstract	Recently, we found that transcription of the yvyD gene of Bacillus subtilis from a σH-dependent promoter is induced in response to amino acid starvation. This induction occurred in the wild type, but not in the relA mutant, suggesting that ppGpp might be involved in the activation of σH. In order to substantiate this finding we looked for other σH-dependent genes which also required an active relA gene product for activation in amino acid-starved cells. Three additional transcription units, namely spo0A, spoVG and the ytxGHI operon (also known as the csb40 operon), were found to be under the dual control of RelA and σH in amino acid-starved cells, but many other σH-dependent genes were not activated under these conditions. Of particular interest is the observation that spo0A is one of the genes that need a functional relA gene product for σH-dependent gene activation. Furthermore, in sporulation medium, both Spo0A accumulation and phosphorylation are delayed in the relA deletion strain, leading to a delay in sporulation. A comparison between a relA point mutant and a relA deletion mutant revealed that the relA deletion mutant exhibits a more pronounced delay in the appearance of spores. These results suggest that the stringent response is not required for sporulation per se, but rather enhances the efficiency of sporulation.
Starting Page	913
Ending Page	923
Page Count	11
File Format	PDF
ISSN	00268925
Journal	Molecular and General Genetics MGG
Volume Number	264
Issue Number	6
e-ISSN	14321874
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-11-10
Publisher Place	Berlin/Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Genetics

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