Frozen in time: analyzing molecular dynamics with time-resolved cryo-EM

Area of Science:

• Biophysics
• Structural Biology
• Biochemistry

Background:

• Molecular machines harness thermal energy for complex tasks, utilizing restricted motion and Brownian ratchets.
• Functional cycles involve initialization, processing, and termination, with major states often visualized by cryo-electron microscopy (cryo-EM).
• The precise timing and coordination of intermediate steps within these cycles remain challenging to study.

Purpose of the Study:

• To review the methodological advancements in time-resolved cryo-electron microscopy (trEM).
• To highlight the applications of trEM in addressing biological questions.
• To explain how trEM enables visualization of short-lived intermediate states.

Main Methods:

• Development of time-resolved cryo-electron microscopy (trEM) techniques.
• Shortening reaction times to enrich pre-equilibrium states for imaging.
• Application of trEM to study molecular machine dynamics.

Main Results:

• trEM methodology has been refined for capturing transient molecular states.
• The approach allows for the investigation of previously elusive intermediate steps.
• trEM has been successfully applied to diverse biological systems.

Conclusions:

• trEM is a powerful technique for visualizing dynamic molecular processes.
• Methodological developments have expanded the utility of trEM.
• This technique provides crucial insights into the temporal coordination of molecular machines.