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Updated: Dec 11, 2025

Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution

Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution

Published on: July 8, 2019

Backbone charge transport in double-stranded DNA.

Roman Zhuravel¹, Haichao Huang¹, Georgia Polycarpou²

¹Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel.

Nature Nanotechnology

|August 19, 2020

Summary

This summary is machine-generated.

Charge transport in DNA is complex. New experiments show high currents through DNA molecules, suggesting backbones, not bases, are key for conduction, challenging prior beliefs in DNA electronics.

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Area of Science:

Molecular electronics
Biophysics
Materials science

Background:

Charge transport in DNA is crucial for fundamental science and technology.
Previous experiments show conflicting results due to challenges in stable DNA molecule contacts.
Understanding DNA charge transport is vital for DNA-based electronic devices.

Purpose of the Study:

To investigate charge transport mechanisms in single, long double-stranded DNA (dsDNA) molecules.
To establish reproducible experimental conditions for measuring DNA charge transport.
To clarify the role of DNA structure in charge conduction.

Main Methods:

Utilized a novel experimental setup for reproducible measurements on individual 30-nm-long dsDNA molecules.
Performed current-voltage characteristic measurements across a wide temperature range (5 K to room temperature).
Introduced single-strand discontinuities ('nicks') to assess their impact on charge transport.

Main Results:

Observed high currents (tens of nanoamperes) through both homogeneous and non-homogeneous dsDNA sequences.
Found temperature-independent current from 5-60 K, followed by a power-law decrease above 60 K, similar to organic crystals.
Demonstrated complete current suppression upon introducing a single nick in either DNA strand.

Conclusions:

DNA backbones, not base pairs, appear to mediate long-distance charge transport in dsDNA.
This finding challenges the prevailing understanding in DNA electronics.
The results provide new insights into DNA's conductive properties and potential applications.