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Identification of a putative Bacillus subtilis rho gene
P G Quirk1, E A Dunkley, P Lee
1Department of Biochemistry, Mount Sinai School of Medicine, City University of New York, New York 10029.
Journal of Bacteriology
|February 1, 1993
Summary
Bacillus subtilis rho gene disruption causes protonophore resistance and cold sensitivity. This study identifies a new role for the Rho transcription termination factor in bacterial growth and stress response.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Genetics
Background:
- The Rho transcription termination factor is crucial for regulating gene expression in bacteria.
- Understanding Rho's function in Bacillus subtilis is essential for comprehending bacterial physiology.
Purpose of the Study:
- To investigate the function of the Bacillus subtilis rho gene.
- To characterize the phenotype of a Bacillus subtilis rho mutant.
Main Methods:
- Transposon Tn917 mutagenesis was used to create a rho mutant in Bacillus subtilis.
- Phenotypic analysis included growth rate, protonophore resistance, and sporulation assays.
- Genetic complementation was performed by inserting a chloramphenicol resistance cassette into the rho gene.
Main Results:
- A single Tn917 insertion in the Bacillus subtilis rho gene resulted in protonophore resistance and sensitivity to low temperatures.
- The predicted Rho protein has 427 amino acids and a molecular weight of 48,628.
- The mutant exhibited slower growth at lower temperatures but normal growth and development at 30 degrees C.
- Complementation studies confirmed that rho gene disruption caused the observed phenotype.
Conclusions:
- The Bacillus subtilis rho gene plays a role in regulating bacterial growth, particularly at low temperatures.
- Rho function is linked to protonophore resistance, suggesting a connection to membrane integrity or function.
- This research provides new insights into the multifaceted roles of transcription termination factors in bacterial stress responses.