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Electronic structure study of the bases in DNA duplexes by in situ photon-in/photon-out soft X-ray spectroscopy

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Title: Electronic structure study of the bases in DNA duplexes by in situ photon-in/photon-out soft X-ray spectroscopy
Authors: Guo, J.-H.1 jguo@lbl.gov, Kastanov, S.1,2, Soderstrom, J.1,3, Glans, P.-A.1, West, M.1, Learmonth, T.4, Chiou, J.-W.5, Luo, Y.2, Nordgren, J.3, Smith, K.4, Pong, W.-F.5, Cheng, H.6, Griffiss, J.M.6
Source: Journal of Electron Spectroscopy & Related Phenomena. Aug2010, Vol. 181 Issue 2/3, p197-201. 5p.
Subjects: Electronic structure, Photons, Chemical bonds, Protein structure, Charge transfer, X-ray spectroscopy
Abstract: Abstract: 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 1s 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 π* states of DNA bases. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract: 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 1s 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 π* states of DNA bases. [ABSTRACT FROM AUTHOR]
ISSN:03682048
DOI:10.1016/j.elspec.2010.05.014