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FtsZ Polymerization Assays: Simple Protocols and Considerations
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FtsK, a DNA Motor Protein, Coordinates the Genome Segregation and Early Cell Division Processes in Deinococcus
Shruti Mishra1,2, Hari S Misra1,2, Swathi Kota1,2
1Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India.
Mbio
|October 27, 2022
Summary
Filament temperature-sensitive mutant K (FtsK) protein in Deinococcus radiodurans is crucial for cell division and genome segregation. This study characterizes drFtsK, revealing its dynamic role in coordinating DNA movement with cell division machinery.
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Filament temperature-sensitive mutant K (FtsK)/SpoIIIE proteins are rapid ATP-dependent DNA translocases essential for chromosome segregation and cell division in bacteria.
- Most research on FtsK focuses on single-chromosome bacteria, with limited understanding of its role in multipartite genome-harboring (MGH) bacteria.
- Deinococcus radiodurans R1 is a radioresistant MGH bacterium with a complex genome, making its cell division and genome segregation mechanisms poorly understood.
Purpose of the Study:
- To characterize the FtsK protein from the radioresistant MGH bacterium Deinococcus radiodurans R1 (drFtsK) for the first time.
- To investigate the interdependent regulation of genome segregation and cell division in D. radiodurans.
- To elucidate the role of drFtsK in maintaining cellular morphology and coordinating DNA segregation with cell division.
Main Methods:
- Biochemical assays to characterize drFtsK activity, including stimulation of site-specific recombination.
- Analysis of drFtsK interactions with other cellular proteins involved in division and segregation.
- Microscopic examination of deletion mutants to assess effects on cellular and nucleoid morphology.
- In vivo localization studies using drFtsK-RFP fusion protein to track its dynamic behavior during cell division.
Main Results:
- drFtsK exhibits characteristics of the FtsK/SpoIIIE/Tra family, stimulating recombination and interacting with key cellular proteins.
- Deletion mutants of drFtsK show significant defects in cellular membrane architecture and nucleoid morphology.
- In vivo, drFtsK localizes dynamically to multiple foci on the nucleoid and membrane, concentrating at the septum and coordinating with FtsZ during cell division.
- drFtsK localization dynamics are maintained even in cells recovering from gamma radiation exposure.
Conclusions:
- drFtsK is an active and essential component of the chromosome segregation, cell envelope, and cell division machinery in Deinococcus radiodurans.
- The protein plays a critical role in maintaining normal genome phenotype and cell division, particularly in the context of the bacterium's compact genome and radiation resistance.
- drFtsK's dynamic localization highlights its coordination with FtsZ and the cell division process, suggesting a conserved yet specialized function in MGH bacteria.
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