Chapter title |
Bacterial Chemoreceptor Imaging at High Spatiotemporal Resolution Using Photoconvertible Fluorescent Proteins
|
---|---|
Chapter number | 18 |
Book title |
Bacterial Chemosensing
|
Published in |
Methods in molecular biology, January 2018
|
DOI | 10.1007/978-1-4939-7577-8_18 |
Pubmed ID | |
Book ISBNs |
978-1-4939-7576-1, 978-1-4939-7577-8
|
Authors |
Jacopo Solari, Francois Anquez, Katharina M. Scherer, Thomas S. Shimizu, Solari, Jacopo, Anquez, Francois, Scherer, Katharina M., Shimizu, Thomas S. |
Abstract |
We describe two methods for high-resolution fluorescence imaging of the positioning and mobility of E. coli chemoreceptors fused to photoconvertible fluorescent proteins. Chemoreceptors such as Tar and Tsr are transmembrane proteins expressed at high levels (thousands of copies per cell). Together with their cognate cytosolic signaling proteins, they form clusters on the plasma membrane. Theoretical models imply that the size of these clusters is an important parameter for signaling, and recent PALM imaging has revealed a broad distribution of cluster sizes. We describe experimental setups and protocols for PALM imaging in fixed cells with ~10 nm spatial precision, which allows analysis of cluster-size distributions, and localized-photoactivation single-particle tracking (LPA-SPT) in live cells at ~10 ms temporal resolution, which allows for analysis of cluster mobility. |
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