Membrane fusion intermediates via directional and full assembly of the SNARE complex.

Membrane fusion intermediates via directional and full assembly of the SNARE complex.
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DOI:
10.1126/science.1221976
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发表时间:
2012-06-22
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Jahn R
Jahn R
中科院分区:
其他
文献类型:
--
作者:
Hernandez JM;Stein A;Behrmann E;Riedel D;Cypionka A;Farsi Z;Walla PJ;Raunser S;Jahn R

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细胞膜融合被认为是通过中间体进行的,包括并列脂质双层的对接,近端小叶合并形成半融合隔膜,以及融合孔开放。可溶性N-乙基马来酰亚胺敏感因子附着蛋白受体(SNARE)的膜桥接四螺旋复合物介导融合。然而,SNARE复合物的组装如何产生对接和其他融合中间体尚不清楚。使用无细胞反应,我们视觉上识别中间体,然后在融合即将开始时阻止SNARE融合机器。SNARE的部分和定向组装紧密对接双层,但有效的融合和延长形式的半融合需要组装超出核心复合物的膜连接接头。我们建议,应变的脂质在边缘的扩展对接区启动融合。
Cellular membrane fusion is thought to proceed through intermediates including docking of apposed lipid bilayers, merging of proximal leaflets to form a hemifusion diaphragm, and fusion pore opening. A membrane-bridging four-helix complex of soluble N-ethylmaleimide–sensitive factor attachment protein receptors (SNAREs) mediates fusion. However, how assembly of the SNARE complex generates docking and other fusion intermediates is unknown. Using a cell-free reaction we identified intermediates visually and then arrested the SNARE fusion machinery when fusion was about to begin. Partial and directional assembly of SNAREs tightly docked bilayers, but efficient fusion and an extended form of hemifusion required assembly beyond the core complex to the membrane-connecting linkers. We propose that straining of lipids at the edges of an extended docking zone initiates fusion.
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