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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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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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DNA Binding to the Silica Surface.

Bobo Shi1, Yun Kyung Shin1, Ali A Hassanali1

  • 1Department of Chemistry and Biochemistry and ‡Biophysics Program, The Ohio State University , Columbus, Ohio 43210, United States.

The Journal of Physical Chemistry. B
|May 13, 2015
PubMed
Summary
This summary is machine-generated.

We explored DNA-silica interactions using molecular dynamics simulations. Negatively charged DNA binds to silica via phosphate-silanol attraction and base-silica hydrophobic interactions, with single-stranded DNA showing stronger binding.

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Area of Science:

  • Biomaterials Science
  • Computational Chemistry
  • Surface Science

Background:

  • Understanding DNA-silica interactions is crucial for biotechnological applications.
  • Both DNA and silica surfaces carry negative charges at relevant pH levels, posing a challenge for binding.
  • Existing research indicates varying affinities between different DNA forms and silica surfaces.

Purpose of the Study:

  • To elucidate the fundamental mechanisms governing DNA binding to silica surfaces.
  • To investigate the factors contributing to the differential binding affinities of single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA).
  • To develop a computational approach for large-scale biomolecule-silica simulations.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model the DNA-silica system.
  • Umbrella sampling and the weighted histogram analysis method (WHAM) were utilized to compute free energy profiles.
  • A novel procedure was developed to approximate atomic forces for large-scale simulations.

Main Results:

  • Two primary binding mechanisms were identified: electrostatic attraction between DNA phosphates and surface silanols, and hydrophobic interactions between DNA bases and silica.
  • Single-stranded DNA (ssDNA) exhibits stronger binding than double-stranded DNA (dsDNA).
  • Factors contributing to ssDNA's higher affinity include increased flexibility, accessible unpaired bases for hydrophobic bonding, and lower linear charge density compared to dsDNA.

Conclusions:

  • The study reveals the dual nature of DNA-silica interactions, involving both electrostatic and hydrophobic forces.
  • The enhanced binding of ssDNA is attributed to its structural and charge characteristics, enabling more favorable interactions with silica.
  • The developed computational methods facilitate future large-scale simulations of biomolecule-amorphous silica systems.