Journal of Biomolecular NMR

, Volume 1, Issue 3, pp 299–304 | Cite as

Improved three-dimensional1H−13C−1H correlation spectroscopy of a13C-labeled protein using constant-time evolution

  • Mitsuhiko Ikura
  • Lewis E. Kay
  • Ad Bax
Short Communications


An improved version of the three-dimensional HCCH-COSY NMR experiment is described that correlates the resonances of geminal and vicinal proton pairs with the chemical shift of the13C nucleus attached to one of the protons. The experiment uses constant-time evolution of transverse13C magnetization which optimizes transfer of magnetization and thus improves the sensitivity of the experiment over the original scheme. The experiment is demonstrated for calmodulin complexed with a 26-residue peptide comprising the binding site of skeletal muscle myosin light chain kinase.


3D NMR J connectivity Resonance assignment Isotopic labeling Proteins Calmodulin 


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Copyright information

© ESCOM Science Publishers B.V 1991

Authors and Affiliations

  • Mitsuhiko Ikura
    • 1
  • Lewis E. Kay
    • 1
  • Ad Bax
    • 1
  1. 1.Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney DiseasesNational Institutes of HealthBethesdaUSA

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