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Cholesterol Depletion Suppresses the Translational Diffusion of Class II Major Histocompatibility Complex Proteins in the Plasma Membrane
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Biophysical Journal
- Article date:
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January 1, 2005
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Copyright informationCopyright Biophysical Society Jan 2005. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Glycosylphosphatidylinositol (GPI)-linked and native major histocompatibility complex class II I-E^sup k^ were used as probes to determine the effect of varying cholesterol concentration on the mobility of proteins in the plasma membrane. These proteins were imaged in Chinese hams
ter ovary cells using single-molecule fluorescence microscopy. Observed diffusion coefficients of both native and GPI-linked I-E^sup k^ proteins were found to depend on cholesterol concentration. As the cholesterol concentration decreases the diffusion coefficients decrease by up to a factor of 7 for native and 5 for GPI-linked I-E^sup k^. At low cholesterol concentrations, after sphingomyelinase ...
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