Sizing DNA using a nanometer-diameter pore

被引：243

作者：

Heng, JB ^{[1
]}

Ho, C ^{[1
]}

Kim, T ^{[1
]}

Timp, R ^{[1
]}

Aksimentiev, A ^{[1
]}

Grinkova, YV ^{[1
]}

Sligar, S ^{[1
]}

Schulten, K ^{[1
]}

Timp, G ^{[1
]}

机构：

[1] Univ Illinois, Urbana, IL 61801 USA

来源：

BIOPHYSICAL JOURNAL | 2004年 / 87卷 / 04期

关键词：

D O I：

10.1529/biophysj.104.041814

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Each species from bacteria to human has a distinct genetic fingerprint. Therefore, a mechanism that detects a single molecule of DNA represents the ultimate analytical tool. As a first step in the development of such a tool, we have explored using a nanometer-diameter pore, sputtered in a nanometer-thick inorganic membrane with a tightly focused electron beam, as a transducer that detects single molecules of DNA and produces an electrical signature of the structure. When an electric field is applied across the membrane, a DNA molecule immersed in electrolyte is attracted to the pore, blocks the current through it, and eventually translocates across the membrane as verified unequivocally by gel electrophoresis. The relationship between DNA translocation and blocking current has been established through molecular dynamics simulations. By measuring the duration and magnitude of the blocking current transient, we can discriminate single-stranded from double-stranded DNA and resolve the length of the polymer.

引用

页码：2905 / 2911

页数：7

共 35 条

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