Journal
TRENDS IN CELL BIOLOGY
Volume 15, Issue 11, Pages 626-631Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tcb.2005.09.001
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Funding
- NIAID NIH HHS [R37-AI34867] Funding Source: Medline
- NIGMS NIH HHS [R01-GM064625, R01 GM064625] Funding Source: Medline
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Among the 16 known vertebrate synaptotagmins, only Syt I, IV and VII are also present in C. elegans and Drosophila, suggesting that these isoforms play especially important roles in vivo. Extensive evidence indicates that Syt I is a synaptic vesicle Ca2+ sensor essential for rapid neurotransmitter release. It has been suggested that the ubiquitously expressed Syt VII also regulates synaptic vesicle exocytosis, despite its presence in several tissues in addition to the brain. Here, we discuss recent genetic and biochemical evidence that does not support this view. Syt VIII null mutants do not have a neurological phenotype, and the protein is found on the membrane of lysosomes and some non-synaptic secretory granules, where it regulates Ca2+-triggered exocytosis and plasma membrane repair.
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