Immunoproximity biotinylation reveals the axon initial segment proteome.

Immunoproximity biotinylation reveals the axon initial segment proteome.
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DOI:
10.1038/s41467-023-44015-2
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发表时间:
2023-12-11
影响因子:
16.6
通讯作者:
Zou, Peng
Zou, Peng
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang, Wei;Fu, Yu;Peng, Luxin;Ogawa, Yuki;Ding, Xiaoyun;Rasband, Anne;Zhou, Xinyue;Shelly, Maya;Rasband, Matthew N.;Zou, Peng

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轴突起始段(AIS)是一个专门的神经元隔室所需的动作电位的产生和神经元极性。然而,了解调节AIS结构和功能的机制一直受到其分子组成不完整知识的阻碍。在这里,使用免疫邻近生物素化,我们进一步定义AIS蛋白质组及其在神经元成熟过程中的动态变化。在鉴定的许多AIS蛋白中,我们表明SCRIB在体外和体内都高度富集在AIS中,并且表现出像基于轴突血影蛋白的细胞骨架的周期性结构。我们发现,锚定G与SCRIB相互作用并将其招募到AIS。然而,SCRIB的丢失对anke-bag没有影响。这种强大而灵活的方法进一步定义了AIS蛋白质组,并为阐明调节AIS结构和功能的机制提供了丰富的资源。轴突起始段(AIS)的分子组成还不清楚。在这里,作者在固定的野生型大鼠神经元上使用比率免疫邻近标记策略来鉴定AIS蛋白质组,包括支架蛋白SCRIB。
The axon initial segment (AIS) is a specialized neuronal compartment required for action potential generation and neuronal polarity. However, understanding the mechanisms regulating AIS structure and function has been hindered by an incomplete knowledge of its molecular composition. Here, using immuno-proximity biotinylation we further define the AIS proteome and its dynamic changes during neuronal maturation. Among the many AIS proteins identified, we show that SCRIB is highly enriched in the AIS both in vitro and in vivo, and exhibits a periodic architecture like the axonal spectrin-based cytoskeleton. We find that ankyrinG interacts with and recruits SCRIB to the AIS. However, loss of SCRIB has no effect on ankyrinG. This powerful and flexible approach further defines the AIS proteome and provides a rich resource to elucidate the mechanisms regulating AIS structure and function. The molecular composition of the axon initial segment (AIS) is not well defined. Here, the authors used a ratiometric immunoproximity labeling strategy on fixed wild-type rat neurons to identify the AIS proteome, including the scaffolding protein SCRIB.
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