Delocalization-Assisted Transport through Nucleic Acids in Molecular Junctions.

Journal Article (Journal Article)

The flow of charge through molecules is central to the function of supramolecular machines, and charge transport in nucleic acids is implicated in molecular signaling and DNA repair. We examine the transport of electrons through nucleic acids to understand the interplay of resonant and nonresonant charge carrier transport mechanisms. This study reports STM break junction measurements of peptide nucleic acids (PNAs) with a G-block structure and contrasts the findings with previous results for DNA duplexes. The conductance of G-block PNA duplexes is much higher than that of the corresponding DNA duplexes of the same sequence; however, they do not display the strong even-odd dependence conductance oscillations found in G-block DNA. Theoretical analysis finds that the conductance oscillation magnitude in PNA is suppressed because of the increased level of electronic coupling interaction between G-blocks in PNA and the stronger PNA-electrode interaction compared to that in DNA duplexes. The strong interactions in the G-block PNA duplexes produce molecular conductances as high as 3% G 0 , where G 0 is the quantum of conductance, for 5 nm duplexes.

Full Text

Duke Authors

Cited Authors

  • Valdiviezo, J; Clever, C; Beall, E; Pearse, A; Bae, Y; Zhang, P; Achim, C; Beratan, DN; Waldeck, DH

Published Date

  • May 1, 2021

Published In

Volume / Issue

  • 60 / 17

Start / End Page

  • 1368 - 1378

PubMed ID

  • 33870693

Electronic International Standard Serial Number (EISSN)

  • 1520-4995

International Standard Serial Number (ISSN)

  • 0006-2960

Digital Object Identifier (DOI)

  • 10.1021/acs.biochem.1c00072


  • eng