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Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
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Published on: August 27, 2014

Visualizing single DNA-bound proteins using DNA as a scanning probe.

Maarten C Noom1, Bram van den Broek, Joost van Mameren

  • 1Physics of Complex Systems, Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Nature Methods
|November 13, 2007
PubMed
Summary

Researchers developed a new method to measure forces on DNA-bound proteins. This technique precisely locates proteins and quantifies the forces needed to move them along DNA.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Enzymes and proteins move along DNA in crucial biological processes.
  • DNA-bound proteins and supercoils can impede this motion.
  • Existing methods cannot directly measure the forces exerted by these roadblocks.

Purpose of the Study:

  • To develop a novel technique for measuring forces on DNA-bound proteins.
  • To enable precise localization and force quantification of protein roadblocks on DNA.
  • To explore the mechanical interactions between proteins and DNA.

Main Methods:

  • Constructed a system with four optical traps to manipulate two DNA molecules.
  • Created a DNA probe by wrapping one DNA molecule tightly around another.
  • Scanned the DNA probe along the second DNA molecule to detect interactions.

Main Results:

  • Measured friction forces between DNA polymers to be below 1 pN.
  • Detected significant friction forces upon encountering DNA-bound proteins, enabling their localization.
  • Determined that proteins remain associated at low tensions but can be dislodged with forces >20 pN.
  • Demonstrated full control over the orientation of two DNA molecules for advanced studies.

Conclusions:

  • The developed optical trap system allows for direct measurement of forces on DNA-bound proteins.
  • This method provides accurate localization of proteins and quantifies the forces required to displace them.
  • The technique opens new avenues for studying protein-DNA interactions and multi-region protein binding.