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Area of Science:

  • Molecular Biology
  • Biophysics
  • Materials Science

Background:

  • DNA-based molecular electronics require efficient charge transport within complex architectures.
  • Charge transport has been demonstrated in linear DNA, but its behavior in branched structures like three-way junctions (3WJs) remains unclear.

Purpose of the Study:

  • To investigate the dynamics and efficiency of hole transport and trapping across DNA three-way junctions.
  • To elucidate the mechanisms governing charge transport in 3D DNA architectures.

Main Methods:

  • Femtosecond transient absorption spectroscopy to probe charge carrier dynamics.
  • Molecular dynamics simulations to model DNA conformational changes and electronic coupling.

Main Results:

  • Hole transport across the DNA 3WJ was observed and characterized.
  • Conformational fluctuations in the DNA ground state were identified as a key factor gating charge transport.

Conclusions:

  • Charge transport in DNA 3WJs is modulated by dynamic conformational changes.
  • These findings provide insights into the fundamental principles of charge transport in complex DNA structures for molecular electronics.