Imaging single endocytic events reveals diversity in clathrin, dynamin and vesicle dynamics.

Imaging single endocytic events reveals diversity in clathrin, dynamin and vesicle dynamics.
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成像单个内吞事件揭示了网格蛋白,动力蛋白和囊泡动力学的多样性。

DOI:
10.1111/j.1600-0854.2011.01235.x
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发表时间:
2011-10
期刊:
Traffic (Copenhagen, Denmark)
影响因子:
--
通讯作者:
Simon SM
Simon SM
中科院分区:
其他
文献类型:
--
作者:
Mattheyses AL;Atkinson CE;Simon SM

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利用荧光标记蛋白和全内反射(TIR)荧光显微镜可以检测到笼蛋白介导的内吞作用的动力学。其中许多蛋白质,包括网状蛋白和动力蛋白,都是可溶的,荧光强度的变化可以归因于膜/泡的运动或单个分子数量的变化。对于分析来说,区分物理膜事件和分子动力学是很重要的。研究了内吞作用中的两个物理事件:囊泡从质膜上断裂和囊泡内化。通过单小泡分析,可以表征与断裂和内化相关的动力素和网状蛋白动力学。我们发现,小泡在质膜附近停留的时间长短不一,并且可以在囊泡内化之前或之后发生去涂层。动力素的动力学也随裂解而变化。基于物理事件的检测结果表明,从消逝视野中消失的荧光应该重新评估为内吞作用的检测。这些结果说明了内吞囊泡行为的异质性,以及为生物物理过程建立合适的评估标准的重要性。
The dynamics of clathrin mediated endocytosis can be assayed using fluorescently tagged proteins and total internal reflection (TIR) fluorescence microscopy. Many of these proteins, including clathrin and dynamin, are soluble and changes in fluorescence intensity can be attributed either to membrane/vesicle movement or to changes in the numbers of individual molecules. It is important for assays to discriminate between physical membrane events and the dynamics of molecules. Two physical events in endocytosis were investigated: vesicle scission from the plasma membrane and vesicle internalization. Single vesicle analysis allowed the characterization of dynamin and clathrin dynamics relative to scission and internalization. We show that vesicles remain proximal to the plasma membrane for variable amounts of time following scission, and that uncoating of clathrin can happen before or after vesicle internalization. The dynamics of dynamin also vary with respect to scission. Results from assays based on physical events suggest that disappearance of fluorescence from the evanescent field should be re-evaluated as an assay for endocytosis. These results illustrate the heterogeneity of behaviors of endocytic vesicles and the importance establishing suitable evaluation criteria for biophysical processes.
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