6533b873fe1ef96bd12d4ee0
RESEARCH PRODUCT
Cholesterol binds to synaptophysin and is required for biogenesis of synaptic vesicles.
Matthew J. HannahMatthew J. HannahMatthew J. HannahWieland B. HuttnerWieland B. HuttnerChristoph ThieleChristoph ThieleFalk Fahrenholzsubject
Endocytic cycleSynaptophysinKidneyTritiumSynaptic vesiclePC12 CellsExocytosisR-SNARE ProteinsAnimalsHumansNeuronsVAMP2biologyCell MembraneMembrane ProteinsCell BiologySecretory VesicleMicrovesiclesEndocytosisCell biologyRatsCholesterolMembrane proteinSynaptophysinbiology.proteinPhosphatidylcholinesSynaptic VesiclesBiogenesisSynaptosomesdescription
Here, to study lipid-protein interactions that contribute to the biogenesis of regulated secretory vesicles, we have developed new approaches by which to label proteins in vivo, using photoactivatable cholesterol and glycerophospholipids. We identify synaptophysin as a major specifically cholesterol-binding protein in PC12 cells and brain synaptic vesicles. Limited cholesterol depletion, which has little effect on total endocytic activity, blocks the biogenesis of synaptic-like microvesicles (SLMVs) from the plasma membrane. We propose that specific interactions between cholesterol and SLMV membrane proteins, such as synaptophysin, contribute to both the segregation of SLMV membrane constituents from plasma-membrane constituents, and the induction of synaptic-vesicle curvature.
year | journal | country | edition | language |
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1999-12-10 | Nature cell biology |