Single-particle cryo-electron microscopy of macromolecular complexes.

Area of Science:

• Structural Biology
• Biophysics
• Biochemistry

Background:

• Technological advancements in image acquisition have significantly improved single-particle cryo-electron microscopy (cryo-EM).
• Cryo-EM now achieves near-atomic resolution for complex biological molecules.
• Computational methods enable analysis of distinct particle populations, revealing compositional and conformational ensembles.

Purpose of the Study:

• To describe the fundamentals of single-particle cryo-electron microscopy (cryo-EM).
• To cover a breadth of techniques and approaches for cryo-EM, including low- and high-resolution methods.
• To illustrate crucial steps for obtaining structural information using cryo-EM.

Main Methods:

• Single-particle cryo-electron microscopy (cryo-EM) for high-resolution imaging.
• Advanced computational methods for particle sorting and analysis.
• Tailored approaches to address challenges posed by unstable and dynamic biological assemblies.

Main Results:

• Determination of near-atomic resolution structures for biological complexes.
• Identification of compositional and conformational ensembles within biological assemblies.
• Gaining key insights into macromolecular function through structural analysis.

Conclusions:

• Single-particle cryo-EM is a powerful tool for elucidating biological complex structures at high resolution.
• The methodology provides insights into macromolecular function by analyzing dynamic and compositional states.
• Overcoming challenges related to sample instability is key to successful cryo-EM implementation.