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Related Concept Videos

Single-Strand DNA Binding Proteins01:03

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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DNA Y structure: a versatile, multidimensional single molecule assay.

James T Inman1, Benjamin Y Smith, Michael A Hall

  • 1Department of Physics, LASSP and ‡Howard Hughes Medical Institute, Cornell University , Ithaca, New York 14853, United States.

Nano Letters
|October 8, 2014
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Summary
This summary is machine-generated.

Researchers developed a novel multidimensional optical trapping assay using a "Y structure" DNA construct. This technique precisely tracks multiple DNA configurational changes simultaneously, advancing biomolecular studies.

Keywords:
DNA Y structureDNA torqueOptical tweezersforce spectroscopysingle moleculeunzipping DNA

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Optical trapping is a key single-molecule technique for studying DNA and DNA-binding proteins.
  • Existing methods typically manipulate DNA in only one dimension (stretching, unzipping, or twisting).
  • A multidimensional approach is needed to combine these manipulations for more complex biomolecular measurements.

Purpose of the Study:

  • To develop and utilize a novel multidimensional optical trapping assay.
  • To enable simultaneous manipulation and measurement of DNA in multiple dimensions.
  • To expand the capabilities of optical trapping for studying complex biomolecular interactions.

Main Methods:

  • Development of a novel optical trapping assay utilizing a three-branch DNA construct, termed a "Y structure".
  • Simultaneous application of force and torque to unzip the Y structure DNA.
  • Real-time tracking of configurational changes and measurement of force and extension in all three branches.

Main Results:

  • The multidimensional assay allows precise, real-time tracking of multiple configurational changes.
  • Simultaneous determination of force and extension for all three branches of the Y structure during unzipping.
  • Demonstrated compatibility with fluorescence detection, including unzipping through a paused transcription complex.

Conclusions:

  • The novel Y structure optical trapping assay enables multidimensional manipulation of DNA.
  • This technique allows for simultaneous tracking of multiple DNA configurational changes under force and torque.
  • The assay facilitates visualization and precision mapping of complex biomechanical interactions in biomolecular systems.