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13C direct detected experiments: optimization for paramagnetic signals.

Ivano Bertini1, Beatriz Jiménez, Mario Piccioli

  • 1Magnetic Resonance Center, University of Florence, Via L. Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy. bertini@cerm.unifi.it

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 6, 2005
PubMed
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Optimizing 13C NMR experiments near paramagnetic centers requires careful selection of coherence transfer pathways. Detecting anti-phase signals enhances sensitivity, revealing previously unobserved signals in Calbindin D9k with Ce3+.

Area of Science:

  • Biophysical Chemistry
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology

Background:

  • Paramagnetic centers in proteins significantly influence Nuclear Magnetic Resonance (NMR) signal intensity through enhanced relaxation.
  • Optimizing NMR experiments for systems with paramagnetic probes is crucial for structural and dynamic studies.
  • Calbindin D9k serves as a model system for studying protein-ligand interactions and the effects of metal ions.

Purpose of the Study:

  • To optimize 13C direct detected NMR experiments for observing signals near a paramagnetic center.
  • To assess the sensitivity of different coherence transfer pathways in CACO experiments.
  • To investigate the influence of various experimental parameters on signal detection.

Main Methods:

Related Experiment Videos

  • Comparison of single vs. multiple quantum coherence transfer evolution.
  • Evaluation of in-phase vs. anti-phase detection of 13C signals.
  • Assessment of coherence transfer steps using different in-plane evolution strategies (CyO vs. Cy ali).
  • Application of optimized sequences to Calbindin D9k with a paramagnetic Cerium (Ce3+) ion substitution.

    • Main Results:

    • Acquisition of the anti-phase component of the signal, by removing final refocusing steps, enabled the observation of previously undetected signals.
    • The study identified specific coherence transfer pathways that are more sensitive to the paramagnetic effect.
    • The optimal pathway is dependent on the relative proximity of the Calbindin D9k (Cali) and Carbonyl (CO) groups to the paramagnetic center.

    Conclusions:

    • The choice of coherence transfer pathway is critical and not predictable a priori for NMR experiments involving paramagnetic centers.
    • Detecting the anti-phase signal component significantly improves the observation of signals affected by paramagnetism-induced relaxation.
    • This optimization strategy enhances the utility of NMR for studying the structure and dynamics of metalloproteins and other systems with paramagnetic probes.