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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...

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Related Experiment Video

Updated: May 22, 2026

Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
06:45

Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope

Published on: February 28, 2019

Structural and functional analysis of proteins by high-speed atomic force microscopy.

Arivazhagan Rajendran1, Masayuki Endo, Hiroshi Sugiyama

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan.

Advances in Protein Chemistry and Structural Biology
|May 22, 2012
PubMed
Summary

High-speed atomic force microscopy (HS-AFM) allows real-time observation of protein structural dynamics. This technique overcomes limitations of traditional methods, enabling detailed studies of biomolecular processes.

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Last Updated: May 22, 2026

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Proteins are dynamic molecules crucial for biological functions, with structure dictating function.
  • Traditional methods like X-ray crystallography and NMR have limitations in studying complexed proteins and dynamic structural changes.
  • Single-molecule fluorescence offers insights but lacks comprehensive structural dynamics of the entire protein.

Purpose of the Study:

  • To describe the application of high-speed atomic force microscopy (HS-AFM) for observing real-time protein dynamics.
  • To showcase HS-AFM's capability in analyzing diverse biomolecular processes and interactions.
  • To highlight HS-AFM as a powerful tool for overcoming limitations in structural biology.

Main Methods:

  • High-speed atomic force microscopy (HS-AFM) for direct, real-time visualization of biomolecular structures.
  • Application of HS-AFM to study various dynamic molecular processes in proteins and other macromolecules.

Main Results:

  • HS-AFM enables direct observation of structural dynamics in proteins and biomacromolecules in real time.
  • The study details HS-AFM analyses of photoactivated bacteriorhodopsin, protein-protein interactions, receptor conformational changes, and enzyme/motor protein functions.
  • HS-AFM successfully visualized the movement of proteins on substrates and their interactions with other molecules.

Conclusions:

  • HS-AFM is a revolutionary technique for studying dynamic molecular processes in biological systems.
  • It provides unprecedented insights into protein structure-function relationships and molecular mechanisms.
  • HS-AFM significantly advances the field of structural biology by enabling real-time observation of molecular dynamics.