Sorting of molecular shuttles by designing electrical and mechanical properties of microtubules

Sorting of molecular shuttles by designing electrical and mechanical properties of microtubules
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通过设计微管的电学和机械特性对分子梭进行分类

DOI:
10.1101/107458
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发表时间:
2017
期刊:
BioRxiv
影响因子:
--
通讯作者:
Ryuji Yokokawa
Ryuji Yokokawa
中科院分区:
--
文献类型:
--
作者:
Naoto Isozaki;Hirofumi Shintaku;Hidetoshi Kotera;Taviare L. Hawkins;Jennifer L. Ross;Ryuji Yokokawa

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驱动蛋白驱动的微管作为分子转运体,被称为“分子穿梭机”,以取代微/纳米级的分子操作,在微全分析系统中是必需的。尽管已经证明了靶分子的运输、浓缩和检测,但运输方向的可控性仍然是一个主要挑战。通过定义多个运动方向的选择性分子运输的分子穿梭机的广泛应用,我们集成了自下而上的微管分子设计和自上而下的微流体装置的设计。控制微管的表面电荷密度和刚度,使我们能够创建三种不同类型的微管,每种微管都具有与其电气和机械特性相对应的不同滑动方向。所测量的滑动微管的曲率使我们能够以自上而下的方法优化用于分子分选的装置的尺寸和设计。自下而上和自上而下的集成设计实现了在电场下将刚性微管与带负电荷的软微管分离。我们的方法通过整合分子控制和微流控器件设计来引导多个微管;它不仅限于分子分选器,而且还适用于各种分子梭,其运动方向具有高度可控性。
Kinesin-driven microtubules have been focused on to serve as molecular transporters, called “molecular shuttles,” to replace micro/nanoscale molecular manipulations necessitated in micro total analysis systems. Although transport, concentration, and detection of target molecules have been demonstrated, controllability of the transport directions is still a major challenge. Toward broad applications of molecular shuttles by defining multiple moving directions for selective molecular transport, we integrated a bottom-up molecular design of microtubules and a top-down design of a microfluidic device. The surface charge density and stiffness of microtubules were controlled, allowing us to create three different types of microtubules, each with different gliding directions corresponding to their electrical and mechanical properties. The measured curvature of the gliding microtubules enabled us to optimize the size and design of the device for molecular sorting in a top-down approach. The integrated bottom-up and top-down design achieved separation of stiff microtubules from negatively charged, soft microtubules under an electric field. Our method guides multiple microtubules by integrating molecular control and microfluidic device design; it is not only limited to molecular sorters but is also applicable to various molecular shuttles with the high controllability in their movement directions.
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