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Related Experiment Video

Updated: Jul 28, 2025

Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope

Published on: February 28, 2019

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Viscoelasticity of single folded proteins using dynamic atomic force microscopy.

Surya Pratap S Deopa1, Shivprasad Patil1

  • 1Department of Physics, Indian Institute of Science Education and Research, Pune, India. s.patil@iiserpune.ac.in.

Soft Matter
|June 2, 2023
PubMed
Summary

Single molecule force spectroscopy uses atomic force microscopy to measure protein viscoelasticity. New methods offer promising insights into protein dynamics and structural flexibility, overcoming previous measurement challenges.

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Area of Science:

  • Biophysics
  • Materials Science
  • Biochemistry

Background:

  • Single molecule force spectroscopy enables measurement of protein responses to mechanical forces.
  • Techniques like atomic force microscopy (AFM) and optical tweezers are pivotal in this field.
  • Quantifying protein viscoelasticity is crucial for understanding protein dynamics.

Purpose of the Study:

  • To review efforts in measuring protein viscoelasticity using dynamic AFM.
  • To identify challenges and pitfalls in artifact-free viscoelasticity measurements.
  • To discuss novel methods for assessing protein viscoelasticity and their implications.

Main Methods:

  • Application of controlled forces (pN to nN) to single protein domains.
  • Clamp-type experiments measuring unfolding force and time distributions.
  • Sinusoidal force application to quantify elastic and viscous responses (viscoelasticity).

Main Results:

  • AFM has advanced the study of single protein mechanical responses.
  • Measuring protein viscoelasticity using dynamic AFM presents significant challenges.
  • A new promising method has been reported for measuring folded protein viscoelasticity.

Conclusions:

  • Despite technical advances, artifact-free measurement of protein viscoelasticity remains difficult.
  • Understanding protein viscoelasticity is key to comprehending protein dynamics and flexibility.
  • Emerging techniques promise more accurate assessments of protein mechanical properties.