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Limitations of constant-force-feedback experiments.

Phillip J Elms1, John D Chodera, Carlos J Bustamante

  • 1Biophysics Graduate Group, University of California, Berkeley, CA, USA.

Biophysical Journal
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Constant force feedback in single-molecule experiments can inaccurately measure rapid macromolecular transitions. This technique

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Single-molecule force spectroscopy is crucial for understanding biological molecules.
  • Measuring force-dependent conformational changes at equilibrium is a common experimental approach.

Purpose of the Study:

  • To evaluate the limitations of constant-force-feedback techniques in studying rapid macromolecular conformational transitions.
  • To compare constant-force-feedback with constant-trap-position methods.

Main Methods:

  • Compared force-dependent dynamics of DNA, RNA, and proteins using constant-force-feedback and constant-trap-position techniques.
  • Analyzed the impact of instrument response time on molecular behavior.

Main Results:

  • Constant-force-feedback exhibits severe limitations for rapid macromolecular transitions.
  • Finite instrument response time can alter measured parameters like rate constants and transition state distances.
  • Identified the causes of errors in force-feedback experiments.

Conclusions:

  • Constant force feedback can lead to inaccurate characterization of rapid conformational changes.
  • A simple test is provided to identify and quantify these errors.
  • Avoid constant force feedback for studying rapid macromolecular conformational changes.