SNARE proteins: one to fuse and three to keep the nascent fusion pore open.

SNARE proteins: one to fuse and three to keep the nascent fusion pore open.
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DOI:
10.1126/science.1214984
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发表时间:
2012-03-16
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Pincet F
Pincet F
中科院分区:
其他
文献类型:
--
作者:
Shi L;Shen QT;Kiel A;Wang J;Wang HW;Melia TJ;Rothman JE;Pincet F

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神经递质通过新生的融合孔释放,融合孔通常在双层融合后扩张,阻止了一致的生化研究。在这里,我们采用脂质双层纳米盘作为融合伴侣,其刚性蛋白质框架防止扩张,并揭示了SNARE诱导的融合孔的特性。虽然双层融合的最大速率仅需要每个纳米盘一个SNARE,但在突触传递的生理相关时间尺度上有效释放内容物需要~3个或更多个SNARE抑制剂和天然VAMP 2跨膜结构域。我们认为,几个SNAREpin同时拉链他们的SNARE跨膜螺旋内的新鲜融合的双层提供了一个径向力,防止新生孔重新密封在同步神经递质释放。
Neurotransmitters are released thru nascent fusion pores, which ordinarily dilate after bilayer fusion, preventing consistent biochemical studies. Here, we employ lipid bilayer nanodiscs as fusion partners, whose rigid protein framework prevents dilation and reveals properties of the SNARE-induced fusion pore. While only one SNARE per nanodisc is required for maximum rates of bilayer fusion, efficient release of content on the physiologically-relevant time scale of synaptic transmission requires ~3 or more SNAREpins and the native VAMP2 transmembrane domain. We suggest that several SNAREpins simultaneously zippering their SNARE transmembrane helices within the freshly fused bilayers provide a radial force that prevents the nascent pore from resealing during synchronous neurotransmitter release.
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