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首页> 外文期刊>Neuron >Unitary assembly of presynaptic active zones from Piccolo-Bassoon transport vesicles.
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Unitary assembly of presynaptic active zones from Piccolo-Bassoon transport vesicles.

机译:Piccolo-Bassoon运输囊泡的突触前活动区的统一组装。

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摘要

Recent studies indicate that active zones (AZs)-sites of neurotransmitter release-may be assembled from preassembled AZ precursor vesicles inserted into the presynaptic plasma membrane. Here we report that one putative AZ precursor vesicle of CNS synapses-the Piccolo-Bassoon transport vesicle (PTV)-carries a comprehensive set of AZ proteins genetically and functionally coupled to synaptic vesicle exocytosis. Time-lapse imaging reveals that PTVs are highly mobile, consistent with a role in intracellular transport. Quantitative analysis reveals that the Bassoon, Piccolo, and RIM content of individual PTVs is, on average, half of that of individual presynaptic boutons and shows that the synaptic content of these molecules can be quantitatively accounted for by incorporation of integer numbers (typically two to three) of PTVs into presynaptic membranes. These findings suggest that AZs are assembled from unitary amounts of AZ material carried on PTVs.
机译:最近的研究表明,神经递质释放的活性区(AZ)部位可以由插入突触前质膜的预组装AZ前体囊泡组装而成。在这里,我们报告中枢神经系统突触的一个假定的AZ前体囊泡-Piccolo-巴松管转运囊泡(PTV)-携带了一套完整的AZ蛋白,在遗传和功能上与突触囊泡的胞吐作用有关。延时成像显示PTV具有高度的移动性,与细胞内运输中的作用一致。定量分析表明,单个PTV的Bassoon,Piccolo和RIM含量平均为单个突触前按钮的一半,并且表明这些分子的突触含量可以通过结合整数(通常为两个三)PTVs进入突触前膜。这些发现表明,AZ是由PTV上携带的全部数量的AZ材料组装而成的。

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