期刊
NANO LETTERS
卷 10, 期 4, 页码 1414-1420出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl100271c
关键词
Nanopores; translocation; single-stranded DNA; sequencing
类别
资金
- NanoSci-E+ programme
- NWO
Solid-state nanopores are an emerging class of single-molecule sensors. Whereas most studies so far focused on double-stranded DNA (dsDNA) molecules, exploration of single-stranded DNA (ssDNA) is of great interest as well, for example to employ such a nanopore device to read out the sequence. Here, we study the translocation of long random-sequence ssDNA through nanopores. Using atomic force microscopy, we observe the ssDNA to hybridize into a random coil, forming blobs of around 100 am in diameter For 7 kb ssDNA. These large entangled structures have to unravel, when they arrive at the pore entrance. Indeed, we observe strong blockade events with a translocation time that is exponentially dependent on voltage, tau similar to e-(VIV0). Interestingly, this is very different than for dsDNA, for which tau similar to 1/V. We report translocations of ssDNA but also of ssDNA dsDNA constructs where we compare the conductance-blockade levels for ssDNA versus dsDNA as a function of voltage.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据