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Related Concept Videos

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Related Experiment Video

Updated: Aug 30, 2025

Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Guide to studying intrinsically disordered proteins by high-speed atomic force microscopy.

Noriyuki Kodera1, Toshio Ando1

  • 1Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.

Methods (San Diego, Calif.)
|September 2, 2022
PubMed
Summary

High-speed atomic force microscopy (HS-AFM) visualizes the dynamic structures of intrinsically disordered proteins (IDPs). This technique overcomes limitations of traditional methods, offering new insights into IDP behavior and function.

Keywords:
BioimagingDynamic structureHigh-speed AFMIntrinsically disordered proteins

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Intrinsically disordered proteins (IDPs) lack stable 3D structures, unlike conventional proteins.
  • Their dynamic, flexible nature makes traditional structural analysis methods unsuitable.
  • Single-molecule visualization tools are crucial for studying IDP dynamics.

Purpose of the Study:

  • To review the principles and capabilities of High-speed Atomic Force Microscopy (HS-AFM).
  • To detail experimental considerations for HS-AFM imaging of IDPs.
  • To present methods for quantifying molecular features from HS-AFM data.

Main Methods:

  • High-speed Atomic Force Microscopy (HS-AFM) for direct visualization of single biomolecules.
  • Imaging performed under near physiological conditions without chemical labeling.
  • Quantitative analysis of molecular shape, motion, and function-related dynamics.

Main Results:

  • HS-AFM provides high spatial (2-3 nm lateral, ~0.1 nm vertical) and temporal (<100 ms) resolution.
  • Successfully visualized the shape, motion, and function-related dynamics of IDPs.
  • Demonstrated the utility of HS-AFM in characterizing dynamic protein structures.

Conclusions:

  • HS-AFM is a powerful tool for studying the unique structural properties of IDPs.
  • The technique enables direct observation of IDP dynamics, crucial for understanding their biological roles.
  • HS-AFM imaging opens new avenues for IDP research.