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Influence of Bacillus subtilis phoR on cell wall anionic polymers
Jörg P Müler1, Zhidong An1, Tarek Merad1
1School of Microbiological, Immunological and Virological Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE2 4HH, UK.
Microbiology (Reading, England)
|March 1, 1997
Summary
Researchers studied the Pho regulon in Bacillus subtilis, discovering a mutated PhoR protein (phoR12) that remains active in high phosphate conditions. This finding impacts understanding of bacterial cell wall synthesis regulation.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- The Pho regulon in Bacillus subtilis regulates responses to phosphate availability.
- PhoR and PhoP form a sensor/regulator pair controlling the Pho regulon.
- Understanding Pho regulon function is crucial for bacterial physiology.
Purpose of the Study:
- To investigate the Pho regulon by creating and studying a mutant with an altered PhoR protein.
- To characterize the functional consequences of a specific mutation in the PhoR sensor kinase.
- To explore the role of PhoR in regulating cell wall component synthesis.
Main Methods:
- In vitro mutagenesis was used to generate a mutant strain (phoR12).
- Biochemical analysis identified a single base change leading to an Arg to Ser substitution in PhoR.
- Comparative analysis of wild-type, phoR-negative, and phoR12 mutant strains regarding cell wall components.
Main Results:
- The phoR12 mutation results in a constitutively active PhoR sensor kinase.
- The phoR12 mutant exhibits altered cell wall teichoic and teichuronic acid synthesis, even in phosphate-replete conditions.
- A phoR-negative mutant fails to induce teichuronic acid synthesis under phosphate-limited conditions.
Conclusions:
- The Pho regulon, specifically PhoR, plays a significant role in regulating cell wall component synthesis in Bacillus subtilis.
- Genes involved in teichuronic acid synthesis are likely part of the Pho regulon.
- The phoR12 mutant provides a valuable tool for studying Pho regulon dynamics and phosphate-dependent pathways.