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FtsI and FtsW are localized to the septum in Escherichia coli
L Wang1, M K Khattar, W D Donachie
1Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas 66216, USA.
Abstract:
The localization of FtsI (PBP3), a penicillin-binding protein specifically required for cell division in Escherichia coli, was investigated by immunofluorescence microscopy and found to localize to the septum. The localization of FtsI was not observed in ftsZ or ftsA mutants, indicating that it was dependent on the prior localization of these proteins. Addition of furazlocillin, a specific inhibitor of FtsI, prevented localization of FtsI even though FtsZ and FtsA localization occurred. Interestingly, the localization of FtsN was also prevented by furazlocillin. FtsZ displayed limited localization in furazlocillin-treated cells, whereas it was efficiently localized in FtsI-depleted cells. FtsW, another essential cell division protein, was also localized to the septum.
Insights
FtsI protein localization to the septum in Escherichia coli requires FtsZ and FtsA. Inhibiting FtsI with furazlocillin also blocked FtsN localization, revealing complex dependencies in bacterial cell division.
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Bacterial cell division is a complex process.
- FtsI (PBP3) is essential for Escherichia coli cell division and localizes to the septum.
Purpose of the Study:
- To investigate the localization of FtsI (PBP3) in Escherichia coli.
- To determine the dependencies of FtsI localization on other cell division proteins.
Main Methods:
- Immunofluorescence microscopy was used to visualize protein localization.
- Mutants in cell division genes (ftsZ, ftsA) were analyzed.
- The effect of the FtsI inhibitor furazlocillin was examined.
Main Results:
- FtsI localized to the septum, dependent on FtsZ and FtsA.
- Furazlocillin inhibited FtsI localization and also prevented FtsN localization.
- FtsZ localization was impaired by furazlocillin but not by FtsI depletion.
- FtsW also localized to the septum.
Conclusions:
- FtsI localization is dependent on FtsZ and FtsA.
- FtsI activity, not just its presence, is crucial for FtsN localization.
- The study elucidates intricate regulatory relationships among essential cell division proteins in E. coli.