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Mapping DNA Conformations Using Single-Molecule Conductance Measurements.

Mashari Alangari1,2, Busra Demir3,4, Caglanaz Akin Gultakti3,4

  • 1Department of Electrical Engineering, Engineering College, University of Ha'il, Ha'il 55476, Saudi Arabia.

Biomolecules
|January 21, 2023
PubMed
Summary

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This summary is machine-generated.

Electronic DNA biosensors can identify different DNA structures, like double-stranded DNA (dsDNA) and G-quadruplexes, using single-molecule break-junction (SMBJ) measurements. These conductance peaks reveal specific DNA conformations in solution.

Area of Science:

  • Nanoscience and Nanotechnology
  • Molecular Biology
  • Biophysics

Background:

  • DNA's electronic properties are sensitive to sequence and structure, enabling electronic DNA biosensors.
  • Single-molecule break-junction (SMBJ) measurements reveal complex conductance behaviors in DNA.

Purpose of the Study:

  • Investigate the origin of multiple conductance peaks in SMBJ measurements of DNA.
  • Correlate specific conductance values with distinct DNA conformations.
  • Explore the potential of conductance measurements for detecting low-probability DNA structures.

Main Methods:

  • Single-molecule break-junction (SMBJ) conductance measurements.
  • Circular dichroism (CD) spectroscopy.
  • Computational modeling and sequence/environmental controls.
Keywords:
DNAG-quadruplexesmolecular electronicssingle-molecule break junctionsingle-molecule electronics

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Main Results:

  • Multiple conductance peaks in SMBJ arise from different DNA conformations, including double-stranded B-form DNA (dsDNA) and G-quadruplexes.
  • Specific conductance values are directly linked to specific DNA conformations.
  • The occurrence of these peaks is controllable by manipulating the local environment.

Conclusions:

  • Conductance measurements are highly sensitive for identifying DNA conformations in solution.
  • SMBJ can detect multiple DNA configurations across a wide concentration range.
  • This technique offers new avenues for studying rare DNA conformations.