Single-Molecule Turnarounds of Intraflagellar Transport at the C. elegans Ciliary Tip
| Autor: | Seyda Acar, Jaap van Krugten, Felix Oswald, Jona Mijalkovic, Erwin J.G. Peterman |
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| Přispěvatelé: | Physics of Living Systems, LaserLaB - Molecular Biophysics, Physics and Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
intracellular transport single-molecule biophysics Dynein IFT kinesin General Biochemistry Genetics and Molecular Biology Motor protein 03 medical and health sciences 0302 clinical medicine Microtubule Intraflagellar transport Animals Cilia Caenorhabditis elegans Caenorhabditis elegans Proteins Ciliary tip lcsh:QH301-705.5 dynein Chemistry Cilium Biological Transport Single Molecule Imaging 030104 developmental biology lcsh:Biology (General) Flagella Biophysics Kinesin sense organs Ciliary base ciliary tip turns 030217 neurology & neurosurgery |
| Zdroj: | Cell Reports, Vol 25, Iss 7, Pp 1701-1707.e2 (2018) Mijalkovic, J, van Krugten, J, Oswald, F, Acar, S & Peterman, E J G 2018, ' Single-Molecule Turnarounds of Intraflagellar Transport at the C. elegans Ciliary Tip ', Cell Reports, vol. 25, no. 7, pp. 1701-1707.e2 . https://doi.org/10.1016/j.celrep.2018.10.050 Cell Reports, 25(7), 1701-1707.e2. Cell Press |
| ISSN: | 2211-1247 |
| DOI: | 10.1016/j.celrep.2018.10.050 |
| Popis: | Summary: Cilia are microtubule-based sensing hubs that rely on intraflagellar transport (IFT) for their development, maintenance, and function. Kinesin-2 motors transport IFT trains, consisting of IFT proteins and cargo, from ciliary base to tip. There, trains turn around and are transported back by IFT dynein. The mechanism of tip turnaround has remained elusive. Here, we employ single-molecule fluorescence microscopy of IFT components in the tips of phasmid cilia of living C. elegans. Analysis of the trajectories reveals that while motor proteins and IFT-A particle component CHE-11 mostly turn around immediately, the IFT-B particle component OSM-6 pauses for several seconds. Our data indicate that IFT trains disassemble into at least IFT-A, IFT-B, IFT-dynein, and OSM-3 complexes at the tip, where OSM-6 is temporarily retained or undergoes modification, prior to train reassembly and retrograde transport. The single-molecule approach used here is a valuable tool to study how directional switches occur in microtubule-based transport processes. : Using single-molecule fluorescence microscopy, Mijalkovic et al. visualize the dynamics of IFT components at the tips of C. elegans chemosensory cilia. They find that the motors and the IFT-A particle component CHE-11 reverse almost immediately, while the IFT-B component OSM-6 is temporarily retained before reassembly and reversal. Keywords: intracellular transport, IFT, kinesin, dynein, single-molecule biophysics, ciliary tip turns |
| Databáze: | OpenAIRE |
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