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Related Concept Videos

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...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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.
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DNA has a double-helix structure. The...
DNA Packaging00:58

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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

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Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
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Heterogeneous nanoclusters assembled by PNA-templated double-stranded DNA.

Dazhi Sun1, Andrea L Stadler, Mikhail Gurevich

  • 1Center for Functional Nanomaterials, Brookhaven National Laboratory Upton, NY 11973, USA.

Nanoscale
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

Researchers created unique nanoparticle clusters using a novel DNA-based method. This technique allows for precise control over nanoparticle arrangement and composition for advanced material design.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biotechnology

Background:

  • Nanoparticle clusters offer unique properties due to their controlled architecture.
  • DNA nanotechnology provides a versatile platform for self-assembly of nanoscale structures.
  • Integrating diverse nanoparticles into ordered assemblies remains a challenge.

Purpose of the Study:

  • To develop a novel method for fabricating heterogeneous nanoclusters with specific architectures.
  • To demonstrate the site-specific incorporation of nanoparticles into DNA structures.
  • To enable the design of complex nanoparticle assemblies with tailored properties.

Main Methods:

  • Utilizing peptide nucleic acid (PNA) to "invade" DNA double helices at specific sites.
  • Fabricating nanoclusters with trimeric and core-shell architectures.
  • Employing nanoparticles of varying size and composition within the DNA framework.

Main Results:

  • Successfully synthesized heterogeneous nanoclusters with defined trimeric and core-shell structures.
  • Demonstrated site-specific nanoparticle placement guided by PNA-DNA interactions.
  • Showcased the ability to incorporate diverse nanoparticles into a single assembly.

Conclusions:

  • Site-specific PNA-invasion of DNA is an effective strategy for fabricating complex nanoclusters.
  • This method facilitates the precise integration of double-stranded DNA into nanoparticle assembly design.
  • The developed technique opens new avenues for creating advanced functional nanomaterials.