Single reconstituted neuronal SNARE complexes zipper in three distinct stages.

Single reconstituted neuronal SNARE complexes zipper in three distinct stages.
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DOI:
10.1126/science.1224492
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发表时间:
2012-09-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Zhang Y
Zhang Y
中科院分区:
其他
文献类型:
--
作者:
Gao Y;Zorman S;Gundersen G;Xi Z;Ma L;Sirinakis G;Rothman JE;Zhang Y

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SNARE proteins drive membrane fusion by assembling into a four-helix bundle in a zippering process. Here we used optical tweezers to observe in real time a long-sought SNARE assembly intermediate in which only the membrane-distal N-terminal half of the bundle is assembled. Our finding supports the zippering hypothesis, but suggests that zippering proceeds through three sequential binary switches, not continuously, in the N- and C-terminal halves of the bundle and the linker domain. The half-zippered intermediate was stabilized by externally applied force which mimicked the repulsion between apposed membranes being forced to fuse. This intermediate then rapidly and forcefully zippered, delivering free energy of 36 kBT to mediate fusion.
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