Effect of the reflectional symmetry on the coherent hole transport across DNA hairpins

Mehdi Zarea, Yuri Berlin, Mark A Ratner

Research output: Contribution to journalArticle

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Abstract

The coherent hole transfer in three types of DNA hairpins containing strands with adenine (A) and guanine (G) nucleobases has been studied. The investigated hairpins involve An+1GGAn, AnGAGAn, or (AG)2nA strands that connect the hole donor and hole acceptor located on opposite ends of hairpins. The positive charge transfer from the photo-excited donor to the acceptor is shown to be slower for An+1GGAn in comparison with AnGAGAn and (AG)2nA sequences. We have revealed that this is due to the reflectional symmetry of the last two sequences with respect to the axis passing through the middle base. As has been demonstrated, the symmetry of the sequence structure manifests itself in the reflectional symmetry of the energy eigenstates. In addition, it has been shown that (AG)2nA is the only symmetric sequence with a zero energy state in the middle of the LUMO tight-binding energy band. Based on our theoretical findings, we predict that the hairpin with this sequence should have the fastest coherent hole transfer rate among the class of base sequences studied.

Original languageEnglish
Article number114105
JournalJournal of Chemical Physics
Volume146
Issue number11
DOIs
Publication statusPublished - Mar 21 2017

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Guanine
Adenine
Binding energy
Band structure
Electron energy levels
Charge transfer
deoxyribonucleic acid
DNA
symmetry
strands
guanines
adenines
energy bands
eigenvectors
binding energy
charge transfer
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Effect of the reflectional symmetry on the coherent hole transport across DNA hairpins. / Zarea, Mehdi; Berlin, Yuri; Ratner, Mark A.

In: Journal of Chemical Physics, Vol. 146, No. 11, 114105, 21.03.2017.

Research output: Contribution to journalArticle

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