The high-affinity calcium sensor synaptotagmin-7 serves multiple roles in regulated exocytosis.
The high-affinity calcium sensor synaptotagmin-7 serves multiple roles in regulated exocytosis.
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DOI:
10.1085/jgp.201711944
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发表时间:
2018-06-04
期刊:
影响因子:
--
通讯作者:
Anantharam A
中科院分区:
文献类型:
--
作者:
MacDougall DD;Lin Z;Chon NL;Jackman SL;Lin H;Knight JD;Anantharam A
MacDougall et al. review the structure and function of the calcium sensor synaptotagmin-7 in exocytosis. Synaptotagmin (Syt) proteins comprise a 17-member family, many of which trigger exocytosis in response to calcium. Historically, most studies have focused on the isoform Syt-1, which serves as the primary calcium sensor in synchronous neurotransmitter release. Recently, Syt-7 has become a topic of broad interest because of its extreme calcium sensitivity and diversity of roles in a wide range of cell types. Here, we review the known and emerging roles of Syt-7 in various contexts and stress the importance of its actions. Unique functions of Syt-7 are discussed in light of recent imaging, electrophysiological, and computational studies. Particular emphasis is placed on Syt-7–dependent regulation of synaptic transmission and neuroendocrine cell secretion. Finally, based on biochemical and structural data, we propose a mechanism to link Syt-7’s role in membrane fusion with its role in subsequent fusion pore expansion via strong calcium-dependent phospholipid binding.
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