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Related Experiment Videos

Orientation of DNA on a surface from simulation.

Ka-Yiu Wong1, B Montgomery Pettitt

  • 1Department of Chemistry and Institute for Molecular Design, University of Houston, 4800 Calhoun, Houston, TX 77204-5003, USA.

Biopolymers
|March 30, 2004
PubMed
Summary

DNA orientation near surfaces affects hybridization. Molecular dynamics simulations show a tethered DNA duplex tilting significantly, with its linker collapsing onto the surface, while maintaining a B-form structure.

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Area of Science:

  • Biophysics
  • Surface Science
  • Molecular Biology

Background:

  • DNA orientation and conformation near surfaces are critical for applications like biosensing and nanotechnology.
  • Understanding DNA-surface interactions requires detailed structural and dynamic information.

Purpose of the Study:

  • To investigate the structural dynamics and orientation of a DNA duplex tethered to an epoxide-coated silica surface.
  • To elucidate the conformational changes of DNA and its linker upon surface interaction.

Main Methods:

  • A 40-nanosecond molecular dynamics simulation was employed.
  • The study focused on a 12-base-pair DNA duplex attached to a neutral, epoxide-coated silica surface.

Main Results:

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  • The DNA duplex exhibited significant tilting, deviating over 55 degrees from the surface normal, with tilting events occurring on the nanosecond timescale.
  • The linker connecting DNA to the surface transitioned from an upright to a tilted position, eventually collapsing onto the surface.
  • Despite conformational fluctuations, the DNA maintained a B-form structure throughout the simulation.
  • Analysis of helical parameters revealed noticeable conformational changes at the DNA end tethered to the surface.

    • Conclusions:

    • Surface-induced forces cause substantial changes in DNA orientation and linker conformation.
    • The DNA duplex remains structurally stable in its B-form despite dynamic surface interactions.
    • These findings provide insights into DNA-surface interactions relevant for molecular electronics and biosensor design.