Dual inhibition of SNARE complex formation by tomosyn ensures controlled neurotransmitter release.

Dual inhibition of SNARE complex formation by tomosyn ensures controlled neurotransmitter release.
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DOI:
10.1083/jcb.200805150
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发表时间:
2008-10-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Takai Y
Takai Y
中科院分区:
其他
文献类型:
--
作者:
Sakisaka T;Yamamoto Y;Mochida S;Nakamura M;Nishikawa K;Ishizaki H;Okamoto-Tanaka M;Miyoshi J;Fujiyoshi Y;Manabe T;Takai Y

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突触前神经末梢的神经递质释放受可溶性NSF附着蛋白受体(SNARE)复合物介导的突触囊泡融合的调节。Tomosyn通过其C-末端囊泡相关膜蛋白(VAMP)样结构域(VLD)隔离syntaxin-1抑制SNARE复合物形成和神经递质释放。然而,在tomosyn缺陷小鼠中,SNARE复合物的形成出乎意料地减少。在这项研究中,我们证明,N-末端WD-40重复结构域的tomosyn催化寡聚化的陷阱复合物。将tomosyn N-末端WD-40重复结构域显微注射到神经元中防止刺激的乙酰胆碱释放。因此,除了C-末端VLD的抑制活性之外,tomosyn还通过N-末端WD-40重复结构域催化SNARE复合物的寡聚化来抑制神经递质释放。
Neurotransmitter release from presynaptic nerve terminals is regulated by soluble NSF attachment protein receptor (SNARE) complex–mediated synaptic vesicle fusion. Tomosyn inhibits SNARE complex formation and neurotransmitter release by sequestering syntaxin-1 through its C-terminal vesicle-associated membrane protein (VAMP)–like domain (VLD). However, in tomosyn-deficient mice, the SNARE complex formation is unexpectedly decreased. In this study, we demonstrate that the N-terminal WD-40 repeat domain of tomosyn catalyzes the oligomerization of the SNARE complex. Microinjection of the tomosyn N-terminal WD-40 repeat domain into neurons prevented stimulated acetylcholine release. Thus, tomosyn inhibits neurotransmitter release by catalyzing oligomerization of the SNARE complex through the N-terminal WD-40 repeat domain in addition to the inhibitory activity of the C-terminal VLD.
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影响因子: --
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