Journal
JOURNAL OF CELL BIOLOGY
Volume 217, Issue 8, Pages 2831-2849Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201711104
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Funding
- National Institutes of Health [R01EY018421]
- Fight for Sight
- Research to Prevent Blindness
- Lions Clubs of Central New York, District 20-Y1
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Physical properties of primary cilia membranes in living cells were examined using two independent, high-spatiotemporal-resolution approaches: fast tracking of single quantum dot-labeled G protein-coupled receptors and a novel two-photon super-resolution fluorescence recovery after photobleaching of protein ensemble. Both approaches demonstrated the cilium membrane to be partitioned into corralled domains spanning 274 +/- 20 nm, within which the receptors are transiently confined for 0.71 +/- 0.09 s. The mean membrane diffusion coefficient within the corrals, D-m1 = 2.9 +/- 0.41 mu m(2)/s, showed that the ciliary membranes were among the most fluid encountered. At longer times, the apparent membrane diffusion coefficient, D-m2 = 0.23 +/- 0.05 mu m(2)/s, showed that corral boundaries impeded receptor diffusion 13-fold. Mathematical simulations predict the probability of G protein-coupled receptors crossing corral boundaries to be 1 in 472. Remarkably, latrunculin A, cytochalasin D, and jasplakinolide treatments altered the corral permeability. Ciliary membranes are thus partitioned into highly fluid membrane nanodomains that are delimited by filamentous actin.
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