The Janus-faced nature of the C(2)B domain is fundamental for synaptotagmin-1 function.

The Janus-faced nature of the C(2)B domain is fundamental for synaptotagmin-1 function.
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C(2)B结构域的Janus面对面性质对于SynaptoTagmin-1函数是基础。

DOI:
10.1038/nsmb.1508
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发表时间:
2008-11
影响因子:
16.8
通讯作者:
Rizo, Josep
Rizo, Josep
中科院分区:
生物学1区
文献类型:
--
作者:
Xue, Mingshan;Ma, Cong;Craig, Timothy K.;Rosenmund, Christian;Rizo, Josep

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Synaptotagmin-1作为神经递质释放中的Ca 2+传感器发挥作用,并被提出通过涉及其C2结构域的Ca 2+结合顶环和C2B结构域的Ca 2+非依赖性底面的相互作用于突触囊泡和质膜。然而,C2B结构域底面的功能重要性尚不清楚。我们现在表明,在C2B结构域的底面突变两个保守的peptides几乎废除海马神经元的同步释放。重建实验表明,Ca 2 +/synaptotagmin-1可以显着刺激SNARE依赖的脂质混合/融合的速率,两个精氨酸突变强烈削弱这种活性。这些结果表明,synaptotagmin-1的功能严重依赖于底面的C2B结构域,并强烈支持的概念,synaptotagmin-1触发膜融合和神经递质释放,使囊泡和质膜在一起,很像SNARE做,但在一个Ca 2+依赖的方式。
Synaptotagmin-1 functions as a Ca2+ sensor in neurotransmitter release, and was proposed to act on both the synaptic vesicle and plasma membranes through interactions involving the Ca2+-binding top loops of its C2 domains and the Ca2+-independent bottom face of the C2B domain. However, the functional importance of the C2B domain bottom face is unclear. We now show that mutating two conserved arginines at the C2B domain bottom face practically abolishes synchronous release in hippocampal neurons. Reconstitution experiments reveal that Ca2+/synaptotagmin-1 can dramatically stimulate the rate of SNARE-dependent lipid mixing/fusion and that the two-arginine mutation strongly impairs this activity. These results demonstrate that synaptotagmin-1 function depends critically on the bottom face of the C2B domain and strongly support the notion that synaptotagmin-1 triggers membrane fusion and neurotransmitter release by bringing the vesicle and plasma membranes together, much like the SNAREs do but in a Ca2+-dependent manner.
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