Calcium-independent stimulation of membrane fusion and SNAREpin formation by synaptotagmin I.

Calcium-independent stimulation of membrane fusion and SNAREpin formation by synaptotagmin I.
复制标题

DOI:
10.1083/jcb.200203135
复制
发表时间:
2002-07-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Söllner TH
Söllner TH
中科院分区:
其他
文献类型:
--
作者:
Mahal LK;Sequeira SM;Gureasko JM;Söllner TH

文献摘要

参考文献

被引文献

相似文献

神经递质的释放需要钙传感器与膜融合机制的直接耦合。SNARE蛋白包括最小的融合机制,突触结合蛋白I,一种突触囊泡蛋白,是主要神经元钙传感器的主要候选者。为了测试突触结合蛋白I对膜融合的影响,我们将其纳入SNARE介导的脂质体融合试验。Synaptotagmin I通过促进SNAREpin拉链显著刺激膜融合。这种刺激作用在拓扑学上局限于v-SNARE囊泡(含有VAMP 2),并且仅发生在反式t-SNARE囊泡(含有突触融合蛋白1A和SNAP-25)中。有趣的是,钙并不影响整体融合反应。这些结果表明,synaptotagmin I可以直接加速SNARE介导的膜融合,并提高了可能需要额外的组件来确保紧密的钙耦合的可能性。
Ñeurotransmitter release requires the direct coupling of the calcium sensor with the machinery for membrane fusion. SNARE proteins comprise the minimal fusion machinery, and synaptotagmin I, a synaptic vesicle protein, is the primary candidate for the main neuronal calcium sensor. To test the effect of synaptotagmin I on membrane fusion, we incorporated it into a SNARE-mediated liposome fusion assay. Synaptotagmin I dramatically stimulated membrane fusion by facilitating SNAREpin zippering. This stimulatory effect was topologically restricted to v-SNARE vesicles (containing VAMP 2) and only occurred in trans to t-SNARE vesicles (containing syntaxin 1A and SNAP-25). Interestingly, calcium did not affect the overall fusion reaction. These results indicate that synaptotagmin I can directly accelerate SNARE-mediated membrane fusion and raise the possibility that additional components might be required to ensure tight calcium coupling.
DOI: 10.1038/35025084
发表时间: 2000-09-14
期刊: NATURE
影响因子: 64.8
作者:
Fukuda, R;McNew, JA;Söllner, TH
通讯作者: Söllner, TH
DOI: 10.1038/nsb750
发表时间: 2002-02-01
期刊: NATURE STRUCTURAL BIOLOGY
影响因子: --
作者:
Fasshauer, D;Antonin, W;Jahn, R
通讯作者: Jahn, R
DOI: 10.1016/0092-8674(94)90556-8
发表时间: 1994-11-18
期刊: CELL
影响因子: 64.5
作者:
GEPPERT, M;GODA, Y;SUDHOF, TC
通讯作者: SUDHOF, TC
DOI: 10.1074/jbc.m906729199
发表时间: 2000-08-18
影响因子: 4.8
作者:
Bai, JH;Earles, CA;Chapman, ER
通讯作者: Chapman, ER
DOI: 10.1126/science.1589771
发表时间: 1992-05-15
期刊: SCIENCE
影响因子: 56.9
作者:
BROSE, N;PETRENKO, AG;JAHN, R
通讯作者: JAHN, R