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Synaptotagmin I, the calcium sensor for neurotransmission, is palmitoylated. We have identified the palmitoylation sites as five cysteine residues located between the transmembrane and cytoplasmic regions. In contrast to wild-type synaptotagmin, the non-acylated mutant is not converted to the endoglycosidase-H-resistant form after expression in CV-1 cells. This indicates a block in transport through...
Synaptotagmin, a likely calcium sensor for synaptic transmission, and SNAP-25, a t-SNARE of the presynaptic plasma membrane, are key proteins for the docking and fusion of synaptic and other vesicles. We report that both synaptotagmin and SNAP-25 are palmitoylated with their fatty acids attached in a labile thioester-type bond. A SNAP-25 mutant with deleted palmitoylation sites is found exclusively...
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