Journal of Biomolecular NMR

, Volume 5, Issue 3, pp 315–320

Novel three-dimensional 1H−13C−31P triple resonance experiments for sequential backbone correlations in nucleic acids

  • Gabriele Varani
  • Fareed Aboul-ela
  • Frederic Allain
  • Charles C. Gubser
Short Communications


Backbone-driven assignment methods that utilize covalent connectivities have greatly facilitated spectral assignments of proteins. In nucleic acids, 1H−13C−31P correlations could play a similar role, and several related experiments (HCP) have recently been presented for backbone-driven sequential assignments in RNA. The three-dimensional extension of 1H−31P Het-Cor (P,H-COSY-H,C-HMQC) and Het-TOCSY (P,H-TOCSY-H,C-HMQC) experiments presented here complements HCP experiments as tools for spectral assignments and extraction of dihydral angle constraints. By relying on 1H−31P rather than 13C−31P couplings to generate cross peaks, the strongest connectivities are observed in different spectral regions, increasing the likelihood of resolving spectral overlap. In addition, semiquantitative estimates of 1H−31P and 13C−31P couplings provide dihedral angle constraints for RNA structure determination.


1H−13C−31P correlation RNA structure determination Dihedral angle constraints Spectral assignments 


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Copyright information

© ESCOM Science Publishers B.V. 1995

Authors and Affiliations

  • Gabriele Varani
    • 1
  • Fareed Aboul-ela
    • 1
  • Frederic Allain
    • 1
  • Charles C. Gubser
    • 1
  1. 1.MRC Laboratory of Molecular BiologyCambridgeU.K.

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