High-speed AFM and applications to biomolecular systems

Area of Science:

• Biophysics
• Molecular Biology
• Microscopy

Background:

• Historically, protein function was inferred from static structures or indirectly observed dynamics.
• Limitations in spatiotemporal resolution hindered direct observation of molecular mechanisms.
• Advancements in microscopy were needed to visualize proteins in action.

Purpose of the Study:

• To review the capabilities of high-speed atomic force microscopy (HS-AFM) for observing protein dynamics.
• To discuss the theoretical limits and recent advancements in HS-AFM imaging rates.
• To highlight applications and future challenges in visualizing molecular processes.

Main Methods:

• High-speed atomic force microscopy (HS-AFM) for direct visualization.
• Imaging biological molecules in physiological solutions.
• Achieving subsecond to sub-100-ms temporal resolution.

Main Results:

• HS-AFM enables direct visualization of protein structure dynamics and function.
• Successful visualization of myosin V on actin filaments and bacteriorhodopsin.
• Demonstration of high spatiotemporal resolution imaging without functional interference.

Conclusions:

• HS-AFM represents a significant advancement in observing molecular machinery in action.
• The technology allows for unprecedented insights into protein dynamics in native environments.
• Future research directions include pushing imaging rates and exploring new biological systems.