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:
影响因子:
--
通讯作者:
Jahn R
中科院分区:
文献类型:
--
作者:
Hernandez JM;Stein A;Behrmann E;Riedel D;Cypionka A;Farsi Z;Walla PJ;Raunser S;Jahn R
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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