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Stretched double-stranded DNA can show multiple plateaus in force-extension curves, depending on segment properties. These distinct DNA states may influence cellular processing rates.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Biology

Background:

  • Double-stranded DNA (dsDNA) exhibits unique mechanical properties when stretched.
  • A plateau region in the force-extension curve indicates a specific mechanical state of dsDNA.

Purpose of the Study:

  • To predict the force-extension behavior of composite dsDNA fragments with varying segment properties.
  • To investigate the formation of distinct plateau regions and conformational states in stretched dsDNA.

Main Methods:

  • Utilized a bead-spring coarse-grained dynamic model.
  • Employed a nonconvex potential to simulate dsDNA stretching.
  • Modeled composite dsDNA fragments with segments of different plateau force values.

Main Results:

  • Predicted multiple distinct plateau regions in force-extension curves for composite dsDNA.
  • Demonstrated that segments with different plateau forces lead to multiple plateaus.
  • Observed drastic differences in segment extension, with one segment dominating the extension in mixed states.
  • Found that segment order minimally impacts the overall force-extension curve.

Conclusions:

  • Composite dsDNA fragments can exhibit multiple distinct mechanical states when stretched.
  • These sequence-dependent structural states may play a functional role in DNA processing by cellular machinery.