Trans-SNARE interactions elicit Ca2+ efflux from the yeast vacuole lumen.

Trans-SNARE interactions elicit Ca2+ efflux from the yeast vacuole lumen.
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跨节相互作用引起酵母液泡腔的Ca2+外排。

DOI:
10.1083/jcb.200310105
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发表时间:
2004-01-19
影响因子:
7.8
通讯作者:
Wickner, WT
Wickner, WT
中科院分区:
生物学1区
文献类型:
--
作者:
Merz, AJ;Wickner, WT

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Ca2+瞬态触发许多依赖于snare的膜融合事件。酵母液泡的同型融合发生在腔内Ca2+释放后。在这里,我们表明跨snare相互作用促进Ca2+从液泡腔释放。Ypt7p-GTP、Sec1p/ munc18蛋白Vps33p和Rho GTPases都在对接过程中起作用,是Ca2+释放所必需的。SNARE功能抑制剂阻止Ca2+释放。重组Vam7p,可溶性Q-SNARE,刺激Ca2+释放。液泡缺乏两个互补的SNAREs, Vam3p或Nyv1p中的任何一个,在系缚时不能释放Ca2+。将这两个液泡种群混合在一起,可以使Vam3p和Nyv1p在反式中相互作用,并挽救Ca2+的释放。Sec17/18p通过循环利用SNAREs(可能还有其他限制因素)促进持续的Ca2+释放,但在释放步骤本身并不需要。我们得出结论,对接过程中的跨snare组装事件促进了液泡腔内Ca2+的释放。
Ca2+ transients trigger many SNARE-dependent membrane fusion events. The homotypic fusion of yeast vacuoles occurs after a release of lumenal Ca2+. Here, we show that trans-SNARE interactions promote the release of Ca2+ from the vacuole lumen. Ypt7p–GTP, the Sec1p/Munc18-protein Vps33p, and Rho GTPases, all of which function during docking, are required for Ca2+ release. Inhibitors of SNARE function prevent Ca2+ release. Recombinant Vam7p, a soluble Q-SNARE, stimulates Ca2+ release. Vacuoles lacking either of two complementary SNAREs, Vam3p or Nyv1p, fail to release Ca2+ upon tethering. Mixing these two vacuole populations together allows Vam3p and Nyv1p to interact in trans and rescues Ca2+ release. Sec17/18p promote sustained Ca2+ release by recycling SNAREs (and perhaps other limiting factors), but are not required at the release step itself. We conclude that trans-SNARE assembly events during docking promote Ca2+ release from the vacuole lumen.
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