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:
影响因子:
--
通讯作者:
Rothman JE
中科院分区:
文献类型:
--
作者:
Giraudo CG;Garcia-Diaz A;Eng WS;Chen Y;Hendrickson WA;Melia TJ;Rothman JE
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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