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Related Concept Videos

DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
The DNA Helix01:07

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
The DNA Helix01:16

The DNA Helix

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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...
The Nucleosome01:19

The Nucleosome

Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
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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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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DNA as a molecular wire: distance and sequence dependence.

Chris H Wohlgamuth1, Marc A McWilliams, Jason D Slinker

  • 1Department of Physics, The University of Texas at Dallas , 800 W. Campbell Rd., EC 36, Richardson, Texas 75080, United States.

Analytical Chemistry
|August 23, 2013
PubMed
Summary

DNA molecular wires offer promise for nanoelectronics. This study reveals charge transport yield correlates with DNA duplex stability and transfer rate depends on temperature and distance, guiding future device applications.

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Area of Science:

  • Nanotechnology
  • Molecular Electronics
  • Biophysics

Background:

  • Nanowires and nanoelectronics are crucial for next-generation integrated circuits.
  • DNA's self-organization, high yield synthesis, and purification make it a promising material for molecular wires.
  • Understanding DNA charge transport (CT) in its double-helical structure under biological conditions is essential but lacking.

Purpose of the Study:

  • To investigate the fundamentals of charge transport through double-stranded DNA monolayers on gold.
  • To assess the factors influencing charge transfer rate and yield in DNA molecular wires.
  • To provide insights for designing DNA-based nanoscale electronic devices.

Main Methods:

  • Utilized 17 base pair DNA bridges on gold surfaces.
  • Employed a redox-active probe conjugated to a modified thymine for assessment.
  • Conducted experiments under temperature-controlled, biologically relevant conditions using cyclic and square wave voltammetry.

Main Results:

  • Demonstrated that charge transport yield is directly proportional to DNA duplex stability, correlating linearly with melting temperature.
  • Found that charge transfer rate is temperature-activated.
  • Observed an inverse distance dependence for transfer rate, consistent with a hopping transport mechanism.

Conclusions:

  • Established that DNA duplex stability is a key determinant of charge transport yield in molecular wires.
  • Identified temperature and distance as critical factors governing charge transfer rate.
  • Provided foundational understanding for optimizing DNA molecular wires in nanoscale electronic applications.