Juxtamembrane tryptophans of synaptobrevin 2 control the process of membrane fusion.
Juxtamembrane tryptophans of synaptobrevin 2 control the process of membrane fusion.
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DOI:
10.1016/j.febslet.2012.11.002
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发表时间:
2013-01-04
期刊:
影响因子:
3.5
通讯作者:
Lindau M
中科院分区:
文献类型:
--
作者:
Fang Q;Zhao Y;Lindau M
Synaptobrevin 2 (Syb2), Syntaxin (Sx1A), and SNAP-25, generate a force to induce fusion pore formation. The v-SNARE, Syb2, is anchored to the vesicle membrane by a single transmembrane domain. Here we show that 2 tryptophans (W89/W90) located in the juxtamembrane domain of Syb2, which stabilize the transmembrane (TM) domain position, control the ratio of spontaneous vs. stimulated membrane fusion events in chromaffin cells. Changing the 2 hydrophobic tryptophans to neutral alanines promotes spontaneous membrane fusion, faster transmitter release kinetics and complete release from individual vesicles. The results indicate that the two tryptophans act as a fusion clamp making fusion stimulus-dependent.
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