Alternative zippering as an on-off switch for SNARE-mediated fusion.

Alternative zippering as an on-off switch for SNARE-mediated fusion.
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DOI:
10.1126/science.1166500
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发表时间:
2009-01-23
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Rothman JE
Rothman JE
中科院分区:
其他
文献类型:
--
作者:
Giraudo CG;Garcia-Diaz A;Eng WS;Chen Y;Hendrickson WA;Melia TJ;Rothman JE

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囊泡和靶膜之间的膜融合包括由靶和囊泡膜上发现的t-和v-SNARs的组成螺旋产生的四螺旋束的拉链。在神经元中,蛋白复合体通过SNARE蛋白进行自发融合,使神经递质和其他介质在需要的时候和地方被释放。复合蛋白的膜-近端辅助螺旋是钳制所必需的,但其作用机制尚不清楚。在这里,我们介绍了使用重组融合系统的实验,该系统提出了一个简单的模型,在该模型中,复杂的辅助螺旋与靠近膜的t-SNARE形成一个替代的四螺旋束,从而阻止V-SNARE完成其拉链。
Membrane fusion between vesicles and target membranes involves the zippering of a four-helix bundle generated by constituent helices derived from t- and v-SNAREs found on the target and vesicular membranes. In neurons the protein complexin clamps otherwise spontaneous fusion by SNARE proteins, allowing neurotransmitters and other mediators to be secreted when and where they are needed as this clamp is released. The membrane-proximal accessory helix of complexin is necessary for clamping, but its mechanism of action is unknown. Here, we present experiments using a reconstituted fusion system that suggest a simple model in which the complexin accessory helix forms an alternative four-helix bundle with the t-SNARE near the membrane, preventing the v-SNARE from completing its zippering.
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