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Electronic structure study of the bases in DNA duplexes by in situ photon-in/photon-out soft X-ray spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Surface and Interface Science.
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2010 (English)In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, Vol. 181, no 2-3, 197-201 p.Article in journal (Refereed) Published
Abstract [en]

Understanding protein functionality is of fundamental importance in biochemistry. Soft X-ray transitions, where the core-level vacancies are filled by the valence-orbital electrons, give direct information about the chemical bonding. Soft X-ray absorption and emission study of poly(dG) -poly(dC) in aqueous solutions can elucidate the relation between the structure and functionality of proteins. We report the N K-edge soft X-ray absorption (XAS) and resonant soft X-ray emission spectroscopy (XES) to characterize the electronic structure near the Fermi level of DNA duplexes to specify the charge migration mechanism. Since N atoms are included in only bases in DNA duplexes, the XES spectra excited from N Is to unoccupied states purely extract the electronic orbital features of the bases in DNA. The fact that N atoms in different bonding environments form well-defined structure has been determined. The experimental findings provide the evidence for the charge-hopping and/or charge-transfer effects in understanding of electric conduction in DNA duplexes when electrons pass through the pi* states of DNA bases. (C) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 181, no 2-3, 197-201 p.
Keyword [en]
Soft X-ray absorption and emission spectroscopy, RIXS, Electronic structure, DNA, G-C pair, A-T pair
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-136495DOI: 10.1016/j.elspec.2010.05.014ISI: 000281932100022OAI: oai:DiVA.org:uu-136495DiVA: diva2:377319
Available from: 2010-12-14 Created: 2010-12-13 Last updated: 2012-04-02Bibliographically approved

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Surface and Interface ScienceSoft X-Ray Physics
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Journal of Electron Spectroscopy and Related Phenomena
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