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DNA Base Pairing02:27

DNA Base Pairing

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
DNA Base Pairing02:27

DNA Base Pairing

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
DNA Topoisomerases02:02

DNA Topoisomerases

Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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Topoisomerases are divided into two main types.  Type I...
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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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Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Related Experiment Video

Updated: Jul 10, 2026

Studying DNA Looping by Single-Molecule FRET
11:27

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

Hydration changes for DNA intercalation reactions.

X Qu1, J B Chaires

  • 1Department of Biochemistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, Mississippi 39216-4505, USA.

Journal of the American Chemical Society
|March 29, 2001
PubMed
Summary

Water molecules play a key role in DNA intercalation. Most intercalators bind to DNA by taking up water, with varying amounts depending on the specific compound, influencing binding affinity.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysical Chemistry

Background:

  • DNA intercalators are compounds that insert between DNA base pairs.
  • Understanding the thermodynamic properties of DNA-intercalator interactions is crucial for drug design and molecular biology.

Purpose of the Study:

  • To investigate the role of hydration changes during the DNA binding of five intercalators.
  • To correlate hydration changes with binding affinity in different solvent conditions.

Main Methods:

  • Osmotic stress method using betaine, sucrose, and triethylene glycol.
  • Measurement of intercalation association constants in both H2O and D2O.

Main Results:

  • Water uptake was observed for propidium, daunomycin, proflavine, and 7-aminoactinomycin D upon DNA binding.
  • Ethidium showed negligible hydration change upon DNA binding.
  • A positive correlation was found between hydration changes (Deltan(w)) and the ratio of binding constants in D2O versus H2O (K(D2O)/K(H2O)).

Conclusions:

  • Hydration is a significant thermodynamic factor in the formation of DNA intercalation complexes for most tested intercalators.
  • Ethidium's unique binding behavior may be related to its minimal interaction with water molecules.
  • These findings provide insights into the molecular mechanisms of DNA intercalation and potential for targeted drug development.