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We confirmed the raft association of synaptotagmin I (syt I) in synaptic vesicles by sucrose density gradient centrifugation, cholesterol depletion, and temperature dependence, and Ca2+ was found to positively regulate this association. Furthermore, using syt I mutants we found that the transmembrane domain (TMD) of syt I plays an important role in localizing syt I into the lipid rafts of synaptic vesicles, and the raft association of the TMD can be regulated by its phosphorylation status.
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Lv et al. (2008) studied this question.
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