One SNARE complex is sufficient for membrane fusion.

One SNARE complex is sufficient for membrane fusion.
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DOI:
10.1038/nsmb.1748
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发表时间:
2010-03
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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在真核生物中,大多数细胞内膜融合反应由存在于两个融合膜中的SNARE蛋白的相互作用介导。然而,膜融合所需的SNARE复合物的最小数量是未知的。在这里,我们明确地表明,一个陷阱复合物是足够的膜融合。我们进行了受控的体外Förster共振能量转移(FRET)实验,发现仅携带单个SNARE分子的脂质体仍然能够与其他脂质体或纯化的突触囊泡融合。此外,我们证明,多个陷阱复合物不合作,显示几个陷阱复合物之间的协同作用是不需要膜融合。我们的研究结果揭示了SNARE介导的膜融合的机制,并要求修改目前的融合事件,如神经递质的快速释放的观点。
In eukaryotes, most intracellular membrane fusion reactions are mediated by the interaction of SNARE proteins that are present in both fusing membranes. However, the minimal number of SNARE complexes needed for membrane fusion is not known. Here, we show unambiguously that one SNARE complex is sufficient for membrane fusion. We performed controlled in vitro Förster resonance energy transfer (FRET) experiments and found that liposomes bearing only a single SNARE molecule are still capable of fusion with other liposomes, or with purified synaptic vesicles. Furthermore, we demonstrate that multiple SNARE complexes do not act cooperatively, showing that synergy between several SNARE complexes is not needed for membrane fusion. Our findings shed new light on the mechanism of SNARE-mediated membrane fusion and ask for a revision of current views of fusion events such as the fast release of neurotransmitters.
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发表时间: 2004-04-09
期刊: SCIENCE
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