Translocation of Rigid Rod-Shaped Virus through Various Solid-State Nanopores

Analytical Chemistry
Hongwen WuQuanjun Liu

Abstract

Nanopores have been used as a high throughput tool for characterizing individual biomolecules and nanoparticles. Here, we present the translocation of rigid rod-shaped tobacco mosaic virus (TMV) through solid-state nanopores. Interestingly, due to the high rigidity of TMV, three types of events with distinctive characteristics at the capture process and a strong current fluctuation during the translocation of TMV are observed. A kinetic model is then proposed to address the dynamics of the translocation, followed by corresponding dynamics simulations. The results reveal that TMV has to rotate to fit and pass the pore when it is captured by a nanopore with an angle larger than the maximum angle that allows it to pass through. Then, we investigate the dependence of the rotation of TMV on the conductance fluctuations at the blockade stage. The results show that the rotation of TMV during the passage through the pore affects the current signal significantly. This study gives a fundamental understanding of the dynamics of rod-shaped particles translocating through the nanopore and how the current responds to it. It opens a new possible way to characterize the rigidity of analytes by nanopores.

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Oct 8, 2016·Frontiers in Microbiology·Lu Yang, Takatoki Yamamoto
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