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Related Concept Videos

Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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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Related Experiment Video

Updated: May 9, 2026

High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping
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Atomic force microscopy reveals two phases in single stranded DNA self-assembled monolayers.

Priscila M Kosaka1, Sheila González, Carmen M Domínguez

  • 1Bionanomechanics Lab, Institute of Microelectronics of Madrid, CSIC, Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.

Nanoscale
|July 9, 2013
PubMed
Summary

Researchers studied single-stranded DNA self-assembled monolayers on gold, revealing nanoscale and microscale structural heterogeneities. These findings on DNA film structure impact its properties and self-assembly mechanisms.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Self-assembled monolayers (SAMs) are crucial in nanotechnology.
  • Understanding DNA SAM structure is key for applications.

Purpose of the Study:

  • To investigate the structural heterogeneities of single-stranded DNA (ssDNA) SAMs on gold.
  • To elucidate the nanoscale and microscale features influencing DNA SAM properties.

Main Methods:

  • Atomic Force Microscopy (AFM) techniques including peak force tapping, Kelvin probe, and phase contrast.
  • Analysis of adhesion, surface potential, and phase shift signals.

Main Results:

  • Identified microscale multilayer aggregations (<5% surface coverage) with ordered phases, suggesting end-to-end DNA interactions.
  • Discovered two distinct phases within the ssDNA monolayer, differing in surface energy and potential.
  • Correlated these domains with variations in packing density and ssDNA conformation.

Conclusions:

  • ssDNA SAMs exhibit complex structural heterogeneities at multiple scales.
  • These heterogeneities significantly influence the film's properties and self-assembly.
  • New insights into DNA SAMs have implications for their biological, chemical, and physical applications.