Solid-State NMR: Methods for Biological Solids

Area of Science:

• Biophysics
• Structural Biology
• Spectroscopy

Background:

• Solid-state nuclear magnetic resonance (ssNMR) has evolved from studying small molecules to analyzing complex biological systems.
• Key advancements include hardware, sample preparation, pulsed methods, isotope labeling, resolution, and sensitivity improvements.
• Unlike solution NMR, ssNMR accounts for the absence of molecular tumbling in solid samples.

Purpose of the Study:

• To review state-of-the-art ssNMR methods for biological samples.
• To discuss recent developments enhancing sensitivity and data acquisition speed.
• To highlight ssNMR applications in solving protein structures and characterizing biological assemblies.

Main Methods:

• Review of static and MAS (Magic Angle Spinning) pulsed NMR methods for biological samples.
• Discussion of advanced signal filtering, proton methodologies, and multiple acquisition techniques.
• Focus on methods applicable to biological systems with long rotational correlation times (>100 ns).

Main Results:

• ssNMR is now a potent tool for determining the structure and dynamics of complex biological systems.
• Examples of solved protein structures (globular, membrane, fibrils, assemblies) using ssNMR are presented.
• Integrated approaches for characterizing challenging biological systems are discussed.

Conclusions:

• ssNMR spectroscopy has been transformed into a powerful technique for structural biology.
• Recent methodological advancements continue to expand the scope and capabilities of ssNMR.
• Emerging subdisciplines within ssNMR spectroscopy are broadening its applications.