High-performance solvent suppression for proton detected solid-state NMR.

Area of Science:

• Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
• Protein structural biology
• Biophysical chemistry

Background:

• High-sensitivity proton detection in solid-state NMR is crucial for studying protein dynamics and interactions.
• Effective solvent suppression is a key challenge for successful proton detection in hydrated protein samples.
• Existing methods often require specialized probes or struggle with simultaneous suppression of multiple solvent signals.

Purpose of the Study:

• To develop and present a high-performance solvent suppression technique for solid-state NMR.
• To enable sensitive detection of proton signals in hydrated protein samples.
• To facilitate advanced NMR investigations of protein-solvent interactions.

Main Methods:

• Development of an optimized combination of homospoil gradients and supercycled saturation pulses.
• Implementation of the Multiple Intense Solvent Suppression Intended for Sensitive Spectroscopic Investigation of Protonated Proteins, Instantly (MISSISSIPPI) method.
• Application of the method without the need for a pulsed field gradient (PFG) probe.

Main Results:

• Simultaneous attenuation of multiple solvent signals by over a factor of 10,000.
• Successful application in high-sensitivity proton detected solid-state NMR experiments.
• Demonstrated applicability to both proton-diluted and fully protonated protein samples.

Conclusions:

• The MISSISSIPPI method offers a robust and high-performance solution for solvent suppression in solid-state NMR.
• This technique significantly enhances opportunities for 2D heteronuclear correlation spectroscopy of hydrated proteins.
• It paves the way for high-sensitivity, multi-dimensional studies of protein-solvent interactions at natural abundance.