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Bacterial Chemoreceptor Imaging at High Spatiotemporal Resolution Using Photoconvertible Fluorescent Proteins
Jacopo Solari1, Francois Anquez2, Katharina M Scherer3
1AMOLF Institute, Amsterdam, The Netherlands.
Methods in Molecular Biology (Clifton, N.J.)
|February 12, 2018
Summary
We developed high-resolution imaging techniques to study E. coli chemoreceptor clusters. These methods reveal insights into cluster size and mobility, crucial for bacterial signaling.
Area of Science:
- Microbiology and Molecular Biology
- Biophysics and Imaging Techniques
Background:
- E. coli chemoreceptors (e.g., Tar, Tsr) are transmembrane proteins forming clusters on the plasma membrane.
- Chemoreceptor cluster size is theoretically important for signal transduction efficiency.
- Previous imaging revealed a wide distribution of cluster sizes, necessitating high-resolution methods.
Purpose of the Study:
- To describe two novel high-resolution fluorescence imaging methods for analyzing E. coli chemoreceptor positioning and mobility.
- To enable precise measurement of chemoreceptor cluster characteristics in both fixed and live bacterial cells.
Main Methods:
- Photoactivated Localization Microscopy (PALM) for fixed cells, achieving ~10 nm spatial precision.
- Localized Photoactivation Single-Particle Tracking (LPA-SPT) for live cells, achieving ~10 ms temporal resolution.
- Detailed experimental setups and protocols for both imaging techniques.
Main Results:
- PALM imaging allows for detailed analysis of chemoreceptor cluster-size distributions in fixed E. coli.
- LPA-SPT enables the study of chemoreceptor cluster dynamics and mobility in live E. coli.
- The described methods provide unprecedented resolution for studying these key bacterial signaling complexes.
Conclusions:
- The developed high-resolution imaging techniques are effective for characterizing E. coli chemoreceptor clusters.
- These methods offer crucial insights into the spatial organization and dynamic behavior of chemoreceptors.
- Understanding chemoreceptor cluster properties is vital for elucidating bacterial chemotaxis signaling pathways.
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