Conformational transitions and stop-and-go nanopore transport of single-stranded DNA on charged graphene.

Abstract:

:Control over interactions with biomolecules holds the key to applications of graphene in biotechnology. One such application is nanopore sequencing, where a DNA molecule is electrophoretically driven through a graphene nanopore. Here we investigate how interactions of single-stranded DNA and a graphene membrane can be controlled by electrically biasing the membrane. The results of our molecular dynamics simulations suggest that electric charge on graphene can force a DNA homopolymer to adopt a range of strikingly different conformations. The conformational response is sensitive to even very subtle nucleotide modifications, such as DNA methylation. The speed of DNA motion through a graphene nanopore is strongly affected by the graphene charge: a positive charge accelerates the motion, whereas a negative charge arrests it. As a possible application of the effect, we demonstrate stop-and-go transport of DNA controlled by the charge of graphene. Such on-demand transport of DNA is essential for realizing nanopore sequencing.

journal_name

Nat Commun

journal_title

Nature communications

authors

Shankla M,Aksimentiev A

doi

10.1038/ncomms6171

subject

Has Abstract

pub_date

2014-10-09 00:00:00

pages

5171

issn

2041-1723

pii

ncomms6171

journal_volume

5

pub_type

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