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Related Experiment Video

Updated: Apr 26, 2026

Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy
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Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy

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Using DNA as a fiducial marker to study SMC complex interactions with the atomic force microscope.

M E Fuentes-Perez1, E J Gwynn, M S Dillingham

  • 1Department of Macromolecular Structures, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Madrid, Spain.

Biophysical Journal
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces an atomic force microscopy method using DNA as a marker to accurately measure protein volumes. It reveals the oligomeric states and interactions of Bacillus subtilis SMC complexes, including SMC, ScpA, and ScpB subunits.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Microscopy

Background:

  • Atomic force microscopy (AFM) offers insights into protein characteristics but is prone to tip-induced artifacts.
  • Accurate measurement of protein volumes, shapes, and interactions is crucial for understanding protein function.

Purpose of the Study:

  • To develop a novel AFM approach for precise volume measurements of nonglobular proteins, specifically structural maintenance of chromosomes (SMC) proteins.
  • To investigate the interactions and oligomeric states within and between Bacillus subtilis SMC complexes.

Main Methods:

  • Co-adsorption of DNA molecules with target proteins on AFM substrates.
  • Utilizing DNA as a fiducial marker to normalize protein volumes and correct for tip-induced artifacts.
  • AFM imaging to determine oligomeric states and architecture of SMC complexes.

Main Results:

  • The developed AFM method significantly reduced volume analysis errors.
  • Determined the oligomeric states: SMC and ScpB are dimers, ScpA is a monomer.
  • Elucidated interaction pathways: ScpA binds directly to SMC; ScpB binds to SMC only when ScpA is present.

Conclusions:

  • The novel AFM approach enables accurate volume quantification of challenging protein samples.
  • The study reveals the subunit composition and architecture of the Bacillus subtilis SMC complex.
  • ScpA and ScpB play critical roles in organizing higher-order SMC complex structures.