Dynamic binding mode of a Synaptotagmin-1-SNARE complex in solution.

Dynamic binding mode of a Synaptotagmin-1-SNARE complex in solution.
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DOI:
10.1038/nsmb.3035
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发表时间:
2015-07
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:
Brewer, Kyle D.;Bacaj, Taulant;Cavalli, Andrea;Camilloni, Carlo;Swarbrick, James D.;Liu, Jin;Zhou, Amy;Zhou, Peng;Barlow, Nicholas;Xu, Junjie;Seven, Alpay B.;Prinslow, Eric A.;Voleti, Rashmi;Haeussinger, Daniel;Bonvin, Alexandre M. J. J.;Tomchick, Diana R.;Vendruscolo, Michele;Graham, Bim;Suedhof, Thomas C.;Rizo, Josep

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神经递质的快速释放依赖于钙离子感受器突触素-1和由突触素、突触素-1和SNAP-25形成的SNARE复合体。突触素-1如何触发释放尚不清楚,部分原因是阐明突触素-1-SNARE复合体的高分辨率结构一直是具有挑战性的。基于稀土诱导的假接触位移的核磁共振方法现在揭示了一种动态结合模式,其中Synaptopagmin-1 C2B结构域β-夹心的凹面碱性残基与由Synaxin-1和SNAP-25形成的SNARE复合体的多酸区域相互作用。这一动态结构模型的生理学相关性得到了突触素-1基本残基突变的支持,该突变显著损害了体外SNARE-复合体结合和神经元中突触素-1的功能。对结合影响较小的突变对突触素-1功能的影响也相应较小。我们的结果支持一个模型,在这个模型中,它们的动态相互作用促进了synaptopagmin-1和SNARs之间的合作,从而诱导了膜融合。
Rapid neurotransmitter release depends on the Ca2+-sensor Synaptotagmin-1 and the SNARE complex formed by synaptobrevin, syntaxin-1 and SNAP-25. How Synaptotagmin-1 triggers release remains unclear, in part because elucidating high-resolution structures of Synaptotagmin-1-SNARE complexes has been challenging. An NMR approach based on lanthanide-induced pseudocontact shifts now reveals a dynamic binding mode where basic residues in the concave side of the Synaptotagmin-1 C2B domain β-sandwich interact with a polyacidic region of the SNARE complex formed by syntaxin-1 and SNAP-25. The physiological relevance of this dynamic structural model is supported by mutations in basic residues of Synaptotagmin-1 that markedly impair SNARE-complex binding in vitro and Synaptotagmin-1 function in neurons. Mutations with milder effects on binding have correspondingly milder effects on Synaptotagmin-1 function. Our results support a model whereby their dynamic interaction facilitates cooperation between synaptotagmin-1 and the SNAREs in inducing membrane fusion.
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