ftsZ mutations affecting cell division frequency, placement and morphology in Bacillus subtilis

Area of Science:

• Microbiology
• Molecular Biology
• Cell Biology

Background:

• Bacterial cytokinesis relies on the assembly of the FtsZ protein into ring-like structures.
• FtsZ, a homolog of tubulin, polymerizes with GTP and is crucial for cell division in most bacteria.
• The FtsZ protein has N-terminal GTP-binding and C-terminal domains, with the latter's function requiring further elucidation.

Purpose of the Study:

• To develop a straightforward method for creating mutations in the essential ftsZ gene.
• To characterize novel ftsZ mutants of Bacillus subtilis and analyze their impact on cell division and morphology.
• To investigate the role of the FtsZ C-terminus in bacterial cytokinesis.

Main Methods:

• Development of a simple strategy for generating mutations in the ftsZ gene.
• Creation and characterization of nine viable ftsZ mutants in Bacillus subtilis.
• Analysis of morphological phenotypes, including cell shape, minicell formation, and sporulation.

Main Results:

• Nine novel and viable ftsZ mutants were successfully generated in Bacillus subtilis.
• Eight mutations targeted the C-terminal domain of FtsZ, leading to diverse morphological phenotypes.
• Observed phenotypes ranged from normal to filamentous cells, including twisted division and impaired sporulation in one mutant.

Conclusions:

• The generated mutants provide valuable tools for studying FtsZ function and protein-protein interactions.
• Mutations affecting the FtsZ C-terminus significantly influence bacterial cell division and morphology.
• This study offers insights into the essential roles of FtsZ domains in bacterial cytokinesis and sporulation.