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Mutant MotB proteins in Escherichia coli
1Department of Cellular and Developmental Biology, Harvard University, Cambridge, Massachusetts 02138.
Journal of Bacteriology
|July 1, 1991
Summary
Mutations in the MotB protein of Escherichia coli reveal its role as a linker in the flagellar motor. Characterizing motB mutants supports its function in connecting the motor to the cell wall.
Area of Science:
- Microbiology
- Molecular Biology
- Biophysics
Background:
- The MotB protein is crucial for torque generation in the bacterial flagellar motor of Escherichia coli.
- Its membrane topology suggests a role as a linker connecting the motor to the cell wall.
Purpose of the Study:
- To isolate and characterize motB mutants to elucidate the protein's function.
- To investigate the structural and functional consequences of mutations in motB.
Main Methods:
- Isolation and characterization of Escherichia coli motB mutants.
- Analysis of mutant phenotypes, including swimming behavior and torque generation in tethered cells.
Main Results:
- Many motB mutations were dominant, consistent with MotB being a motor component.
- Mutations primarily mapped to a hydrophilic, periplasmic domain.
- Some mutants showed partial function with reduced torque, indicating fewer functional torque generators.
Conclusions:
- The results support the hypothesis that MotB acts as a linker protein.
- MotB's role in anchoring the flagellar motor to the cell wall is reinforced.