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A large volume flat coil probe for oriented membrane proteins.

Peter L Gor'kov1, Eduard Y Chekmenev, Riqiang Fu

  • 1National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA. pgorkov@magnet.fsu.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 4, 2006
PubMed
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This study introduces a new 600 MHz solid-state Nuclear Magnetic Resonance (NMR) probe designed for enhanced 15N detection of membrane proteins. The probe overcomes RF field inhomogeneity issues, enabling high-power experiments like Polarization Inversion Spin Exchange at the Magic Angle (PISEMA).

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Membrane protein structural biology
  • Advanced NMR probe design

Background:

  • 15N detection in solid-state NMR is challenging due to low sensitivity and dilute samples.
  • Large sample volumes are needed but limited by RF field inhomogeneity in larger solenoids.
  • This inhomogeneity complicates cross-polarization and multi-pulse experiments.

Purpose of the Study:

  • To develop a 600 MHz solid-state NMR probe for improved 15N detection of membrane proteins.
  • To enable high-power, multi-pulse sequence experiments, including Polarization Inversion Spin Exchange at the Magic Angle (PISEMA).
  • To overcome limitations of RF field inhomogeneity in larger solenoids.

Main Methods:

  • Design and implementation of a 600 MHz 15N-1H solid-state NMR probe with a large (580 mm3) RF solenoid.

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  • Utilized a 4-turn solenoidal sample coil for efficient 15N detection.
  • Employed a balanced tuning-matching circuit and optimized coaxial trap for RF homogeneity and high B1 fields.

    • Main Results:

    • The probe achieves efficient 15N detection and preserves RF homogeneity across the sample.
    • Sufficiently strong RF fields (100 kHz for 1H, 51 kHz for 15N) are sustained simultaneously.
    • Demonstrated functionality via 2D 15N-1H PISEMA spectroscopy on membrane proteins at 600 MHz.

    Conclusions:

    • The developed NMR probe effectively addresses challenges in 15N detection of membrane proteins.
    • It enables high-power experiments with improved RF homogeneity and sensitivity.
    • The probe is suitable for advanced solid-state NMR studies of biological macromolecules.