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Journal of Biomolecular NMR

, Volume 25, Issue 2, pp 105–112 | Cite as

Deuterium isotope effects and fractionation factors of hydrogen-bonded A:T base pairs of DNA

  • Ioannis Vakonakis
  • Miguel Salazar
  • Mijeong Kang
  • Kim R. Dunbar
  • Andy C. LiWangEmail author
Article

Abstract

Deuterium isotope effects and fractionation factors of N1...H3–N3 hydrogen bonded Watson–Crick A:T base pairs of two DNA dodecamers are presented here. Specifically, two-bond deuterium isotope effects on the chemical shifts of 13C2 and 13C4, 2Δ13C2 and 2Δ13C4, and equilibrium deuterium/protium fractionation factors of H3, Φ, were measured and seen to correlate with the chemical shift of the corresponding imino proton, δH3. Downfield-shifted imino protons associated with larger values of 2Δ13C2 and 2Δ13C4 and smaller Φ values, which together suggested that the effective H3–N3 vibrational potentials were more anharmonic in the stronger hydrogen bonds of these DNA molecules. We anticipate that 2Δ13C2, 2Δ13C4 and Φ values can be useful gauges of hydrogen bond strength of A:T base pairs.

chemical shift DNA deuterium isotope effect fractionation factors hydrogen bond imino Watson–Crick 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Ioannis Vakonakis
    • 1
  • Miguel Salazar
    • 2
  • Mijeong Kang
    • 1
  • Kim R. Dunbar
    • 1
  • Andy C. LiWang
    • 1
    Email author
  1. 1.Departments of Biochemistry & BiophysicsTexas A&M UniversityCollege StationU.S.A
  2. 2.University of Texas, College of PharmacyAustinU.S.A

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