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A Novel Labeling Strategy Reveals That Myosin Va and Myosin Vb Bind the Same Dendritically Polarized Vesicle Population.
Traffic ( IF 3.6 ) Pub Date : 2020-09-21 , DOI: 10.1111/tra.12764
Madeline Frank 1 , Clara G Citarella 1 , Geraldine B Quinones 1 , Marvin Bentley 1
Affiliation  

Neurons are specialized cells with a polarized geometry and several distinct subdomains that require specific complements of proteins. Delivery of transmembrane proteins requires vesicle transport, which is mediated by molecular motor proteins. The myosin V family of motor proteins mediates transport to the barbed end of actin filaments, and little is known about the vesicles bound by myosin V in neurons. We developed a novel strategy to visualize myosin V‐labeled vesicles in cultured hippocampal neurons and systematically characterized the vesicle populations labeled by myosin Va and Vb. We find that both myosins bind vesicles that are polarized to the somatodendritic domain where they undergo bidirectional long‐range transport. A series of two‐color imaging experiments showed that myosin V specifically colocalized with two different vesicle populations: vesicles labeled with the transferrin receptor and vesicles labeled by low‐density lipoprotein receptor. Finally, coexpression with Kinesin‐3 family members found that myosin V binds vesicles concurrently with KIF13A or KIF13B, supporting the hypothesis that coregulation of kinesins and myosin V on vesicles is likely to play an important role in neuronal vesicle transport. We anticipate that this new assay will be applicable in a broad range of cell types to determine the function of myosin V motor proteins.

中文翻译:

一种新的标记策略表明肌球蛋白 Va 和肌球蛋白 Vb 结合相同的树突极化囊泡群。

神经元是具有极化几何结构和几个不同的子域的特化细胞,这些子域需要特定的蛋白质补充。跨膜蛋白的传递需要囊泡转运,这是由分子马达蛋白介导的。运动蛋白的肌球蛋白 V 家族介导向肌动蛋白丝带刺末端的转运,并且对神经元中肌球蛋白 V 结合的囊泡知之甚少。我们开发了一种新策略来可视化培养的海马神经元中肌球蛋白 V 标记的囊泡,并系统地表征由肌球蛋白 Va 和 Vb 标记的囊泡群。我们发现两种肌球蛋白都结合极化到体细胞树突结构域的囊泡,在那里它们进行双向远程运输。一系列双色成像实验表明,肌球蛋白 V 与两种不同的囊泡群体特异性共定位:转铁蛋白受体标记的囊泡和低密度脂蛋白受体标记的囊泡。最后,与驱动蛋白 3 家族成员的共表达发现肌球蛋白 V 与 KIF13A 或 KIF13B 同时结合囊泡,支持了驱动蛋白和肌球蛋白 V 在囊泡上的协同调节可能在神经元囊泡转运中起重要作用的假设。我们预计这种新的检测方法将适用于广泛的细胞类型,以确定肌球蛋白 V 运动蛋白的功能。与驱动蛋白 3 家族成员的共表达发现肌球蛋白 V 与 KIF13A 或 KIF13B 同时结合囊泡,支持了驱动蛋白和肌球蛋白 V 在囊泡上的协同调节可能在神经元囊泡转运中起重要作用的假设。我们预计这种新的检测方法将适用于广泛的细胞类型,以确定肌球蛋白 V 运动蛋白的功能。与驱动蛋白 3 家族成员的共表达发现肌球蛋白 V 与 KIF13A 或 KIF13B 同时结合囊泡,支持了驱动蛋白和肌球蛋白 V 在囊泡上的协同调节可能在神经元囊泡转运中起重要作用的假设。我们预计这种新的检测方法将适用于广泛的细胞类型,以确定肌球蛋白 V 运动蛋白的功能。
更新日期:2020-11-09
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