Sensitivity boosts by the CPMAS CryoProbe for challenging biological assemblies.

Area of Science:

• Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
• Biophysics
• Structural Biology

Background:

• Sensitivity limitations in Magic Angle Spinning (MAS) NMR hinder the study of large, complex biological systems.
• Conventional MAS NMR requires significant time for data acquisition, especially for challenging samples.

Purpose of the Study:

• To introduce and evaluate a novel cryogenic probe (BioSolids CryoProbe™) for enhanced sensitivity in MAS NMR.
• To demonstrate the probe's capability for recording time-prohibitive experiments on complex biological systems.

Main Methods:

• Utilized a novel HCN Cryogenic probe with cryogenic sample coil and electronics at ambient sample temperatures.
• Performed heteronuclear-detected experiments, including 2D 15N-15N proton-driven spin diffusion and 15N-13C double cross polarization.
• Applied the probe to study kinesin Kif5b-microtubule assemblies, HIV-1 capsid protein, and amyloidogenic prion proteins (Y145Stop, HET-s).

Main Results:

• Achieved 3-4 fold higher sensitivity in heteronuclear-detected experiments compared to conventional methods.
• Enabled the acquisition of 2D and 3D NMR spectra with improved signal-to-noise ratios.
• Demonstrated excellent spectral quality for challenging biological systems, including protein-protein interactions and amyloid fibrils.

Conclusions:

• The novel cryogenic probe technology significantly overcomes sensitivity challenges in solid-state NMR.
• This advancement facilitates the study of large and complex biological systems at physiological temperatures.
• The probe is expected to benefit a wide range of applications, particularly in structural biology and biophysics.