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Related Concept Videos

Proofreading01:43

Proofreading

Overview
Proofreading01:31

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Nucleic Acid Structure01:25

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.
DNA Structure
DNA has a double-helix structure. The...
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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,
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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,
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Stacking interactions between adenines in oxidized oligonucleotides.

Amedeo Capobianco1, Tonino Caruso, Maurizio Celentano

  • 1Dipartimento di Chimica e Biologia, Università di Salerno, I-84084 Fisciano, Salerno, Italy.

The Journal of Physical Chemistry. B
|July 11, 2013
PubMed
Summary

Stacking interactions influence DNA oxidation potentials in adenine-rich single strands. Structured conformations, confirmed by simulations, impact electron transfer, providing parameters for oxidized DNA studies.

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Area of Science:

  • * Molecular Biophysics
  • * Electrochemistry
  • * Computational Chemistry

Background:

  • * Understanding DNA's electrochemical properties is crucial for biosensor development and DNA damage studies.
  • * Nucleobase stacking significantly influences DNA's electronic structure and reactivity.
  • * Oxidation potentials of DNA are sensitive to sequence and conformation.

Purpose of the Study:

  • * To investigate the impact of stacking interactions on the oxidation potentials of single-stranded oligonucleotides.
  • * To correlate oligonucleotide conformation with electrochemical behavior.
  • * To develop a quantum mechanical model for predicting hole transfer in oxidized DNA.

Main Methods:

  • * Differential pulse voltammetry was employed to measure oxidation potentials.
  • * Molecular dynamics simulations were used to analyze oligonucleotide structures.
  • * A tight-binding quantum model was applied to analyze voltammetric signals.

Main Results:

  • * Voltammetric data indicate structured conformations with significant base stacking in solution.
  • * Molecular dynamics simulations confirm B-DNA-like geometries for the studied oligonucleotides.
  • * Oxidation potentials are modulated by adenine-thymine and adenine-cytosine stacking interactions.

Conclusions:

  • * Oligonucleotide stacking significantly affects electrochemical oxidation potentials.
  • * Structured single strands adopt B-DNA-like conformations, influencing electron transfer.
  • * The developed quantum model provides parameters for understanding hole transfer in oxidized DNA.