The docking stage of yeast vacuole fusion requires the transfer of proteins from a cis-SNARE complex to a Rab/Ypt protein.

The docking stage of yeast vacuole fusion requires the transfer of proteins from a cis-SNARE complex to a Rab/Ypt protein.
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DOI:
10.1083/jcb.148.6.1231
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发表时间:
2000-03-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ungermann C
Ungermann C
中科院分区:
其他
文献类型:
--
作者:
Price A;Seals D;Wickner W;Ungermann C

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酵母空泡的同型融合需要Sec 18 p(NSF)驱动的引发以允许空泡对接,但连接引发和对接的机制尚不清楚。我们发现,一个大的多亚基蛋白质称为Vam 2/6p复合物结合到孤立的液泡顺式配对SNAP受体(SNARE)。Vam 2/6 p复合物与顺式SNARE复合物的这种结合在引发过程中被破坏。然后Vam 2/6p复合物与Rab家族的三磷酸鸟苷结合蛋白Ypt 7 p结合,以启动液泡之间的生产性接触。因此,顺式SNARE复合物可以包含Rab/Ypt效应子,并且这些效应子可以通过NSF/Sec 18 p驱动的引发而被动员,允许它们与Rab/Ypt蛋白直接缔合以激活对接。
The homotypic fusion of yeast vacuoles requires Sec18p (NSF)-driven priming to allow vacuole docking, but the mechanism that links priming and docking is unknown. We find that a large multisubunit protein called the Vam2/6p complex is bound to cis-paired SNAP receptors (SNAREs) on isolated vacuoles. This association of the Vam2/6p complex with the cis-SNARE complex is disrupted during priming. The Vam2/6p complex then binds to Ypt7p, a guanosine triphosphate binding protein of the Rab family, to initiate productive contact between vacuoles. Thus, cis-SNARE complexes can contain Rab/Ypt effectors, and these effectors can be mobilized by NSF/Sec18p-driven priming, allowing their direct association with a Rab/Ypt protein to activate docking.
RBSEC1A和B与语法1和SNAP-25共同定位,但在整个轴突中都不是与语法素一起稳定的复合物。
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