Abstract
Monitoring the fusion of constitutive traffic with the plasma membrane has remained largely elusive. Ideally, fusion would be monitored with high spatial and temporal resolution. Recently, total internal reflection (TIR) microscopy was used to study regulated exocytosis of fluorescently labeled chromaffin granules. In this technique, only the bottom cellular surface is illuminated by an exponentially decaying evanescent wave of light. We have used a prism type TIR setup with a penetration depth of ∼50 nm to monitor constitutive fusion of vesicular stomatitis virus glycoprotein tagged with the yellow fluorescent protein. Fusion of single transport containers (TCs) was clearly observed and gave a distinct analytical signature. TCs approached the membrane, appeared to dock, and later rapidly fuse, releasing a bright fluorescent cloud into the membrane. Observation and analysis provided insight about their dynamics, kinetics, and position before and during fusion. Combining TIR and wide-field microscopy allowed us to follow constitutive cargo from the Golgi complex to the cell surface. Our observations include the following: (1) local restrained movement of TCs near the membrane before fusion; (2) apparent anchoring near the cell surface; (3) heterogeneously sized TCs fused either completely; or (4) occasionally larger tubular-vesicular TCs partially fused at their tips.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 12:45 p.m.) |
Deposited | 1 year, 2 months ago (June 24, 2024, 10:16 a.m.) |
Indexed | 1 month, 3 weeks ago (July 11, 2025, 9:29 p.m.) |
Issued | 25 years, 5 months ago (April 3, 2000) |
Published | 25 years, 5 months ago (April 3, 2000) |
Published Online | 25 years, 5 months ago (April 3, 2000) |
Published Print | 25 years, 5 months ago (April 3, 2000) |
@article{Toomre_2000, title={Fusion of Constitutive Membrane Traffic with the Cell Surface Observed by Evanescent Wave Microscopy}, volume={149}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.149.1.33}, DOI={10.1083/jcb.149.1.33}, number={1}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Toomre, Derek and Steyer, Jürgen A. and Keller, Patrick and Almers, Wolfhard and Simons, Kai}, year={2000}, month=apr, pages={33–40} }