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Identification of Rhodococcus erythropolis Promoters Controlled by Alternative Sigma Factors Using In Vivo and In
Jan Blumenstein1,2, Robert Rädisch1,2, Václav Štěpánek1
1Institute of Microbiology of the CAS, v.v.i., Prague, Czech Republic.
Current Microbiology
|January 4, 2022
Summary
Rhodococcus erythropolis CCM2595 stress response genes, like frmB1 and frmB2, are regulated by SigD, similar to related bacteria. This finding aids in understanding gene regulation under toxic conditions.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Stress Response
Background:
- Rhodococcus erythropolis CCM2595 degrades toxic aromatic compounds.
- Its cell wall features mycolic acids, common in Mycolata bacteria.
- Phenol stress likely upregulates genes controlled by alternative sigma factors.
Purpose of the Study:
- To investigate the link between stress sigma factors and genes activated by extreme conditions in R. erythropolis.
- To develop and apply in vitro and in vivo assays for this investigation.
- To classify R. erythropolis promoters and assign genes to sigma regulons.
Main Methods:
- Development of in vitro and in vivo assays adapted from Corynebacterium glutamicum.
- Analysis of gene regulation under heat, cell surface, and oxidative stress.
- Examination of the control of frmB1 and frmB2 genes by SigD.
Main Results:
- frmB1 and frmB2 genes in R. erythropolis are confirmed to be SigD-controlled.
- This regulation is homologous to cmt1 and cmt2 genes in Corynebacterium glutamicum.
- The developed assays enable promoter classification and gene assignment to sigma regulons.
Conclusions:
- The study establishes a novel protocol for analyzing gene regulation by sigma factors in R. erythropolis.
- This methodology facilitates the dissection of complex stress responses, such as phenol-induced stress.
- Understanding sigma factor regulons is crucial for deciphering bacterial adaptation mechanisms.
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