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Physical and technical parameters determining the functioning C kinesin-based cell- free motor

机译:物理和技术参数决定了基于C驱动蛋白的无细胞马达的功能

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摘要

Kinesin is a microtubule-associated protein,converting chemical into mechanical energy. Based on its abilityto also work outside cells, it has recently been shown that thisbiological machinery might be usable for nanotechnologicaldevelopments. Possible applications of the kinesin-based motorsystem require the solution of numerous methodological andtechnical problems, including the orientation of force generationinto a desired direction and the determination of the tolerableroughness of the surfaces used, the minimal free vertical spacestill enabling force-generating activity, and the temporalstability of the system. This paper reports on the example ofmicrotubules gliding across kinesin-coated surfaces and showsthat the force-generating system needs a minimal free workingspace of about 100 nm height and works up to 3 h with nearlyconstant velocity. Individual microtubules were observed tocover distances of at least 1 mm without being detached fromthe surface and to overcome steps of up to 286 nm height. Inaddition, mechanically induced flow fields were shown to forcegliding microtubules to move in one and the same direction.This result is regarded as being an essential step towards futuredevelopments of kinesin-based microdevices as this approachavoids neutralization of single forces acting in opposite directions.
机译:驱动蛋白是一种微管相关蛋白,可将化学物质转化为机械能。基于其还可以在细胞外工作的能力,最近表明这种生物机制可能对纳米技术的发展有用。基于驱动蛋白的电机系统的可能应用需要解决许多方法和技术问题,包括将力的产生方向对准所需的方向,并确定所用表面的可承受粗糙度,最小的自由垂直空间仍然能够产生力,以及系统的时间稳定性。本文报道了微管在驱动蛋白涂层表面上滑动的例子,并显示了力产生系统需要最小的自由工作空间(约100 nm高),并以恒定速度工作长达3 h。观察到单个微管覆盖至少1 mm的距离而不会从表面脱离,并克服了高达286 nm高度的台阶。此外,机械诱导的流场显示出迫使微管向同一方向滑动。该结果被认为是迈向基于驱动蛋白的微器件未来发展的必不可少的步骤,因为这种方法避免了作用在相反方向的单个力的中和。

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