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Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Protein Denaturation01:28

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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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Fixing Double-strand Breaks

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Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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How adsorption influences DNA denaturation.

A E Allahverdyan1, Zh S Gevorkian, Chin-Kun Hu

  • 1Yerevan Physics Institute, Alikhanian Brothers St. 2, Yerevan 375036, Armenia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 28, 2009
PubMed
Summary

DNA denaturation on surfaces was studied. Adsorption eliminates sharp transitions, causing a smooth crossover. Combined attractions can induce denaturation and adsorption even when individual forces are insufficient.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Materials Science

Background:

  • DNA denaturation, the separation of its two strands, is a fundamental process.
  • Understanding DNA behavior near surfaces is crucial for nanotechnology and molecular biology.
  • Thermal denaturation is influenced by molecular interactions and environmental conditions.

Purpose of the Study:

  • To investigate the impact of attractive solid surfaces on thermally induced DNA denaturation.
  • To model the behavior of DNA strands adsorbed onto a surface.
  • To explore the combined effects of interstrand and surface-strand attractions on DNA states.

Main Methods:

  • Modeling DNA as two coupled flexible chains.
  • Simulating denaturation in the presence of an attractive solid surface.
  • Analyzing phase transitions and crossovers in DNA states.

Main Results:

  • Surface adsorption eliminates the distinct denaturation phase transition.
  • A smooth crossover to a weakly denatured state is observed upon adsorption.
  • Combined interstrand and surface attractions can induce a denatured and adsorbed state, even if individually insufficient.

Conclusions:

  • Surface interactions significantly alter DNA denaturation dynamics.
  • The presence of an attractive surface can stabilize DNA in a partially denatured state.
  • Synergistic effects of multiple attractive forces are critical for achieving specific DNA configurations near surfaces.