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Related Concept Videos

Phosphodiester Linkages01:01

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Polytene Chromosomes02:04

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
Polytene Chromosomes02:04

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

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Related Experiment Video

Updated: May 22, 2026

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
10:23

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

DNA polyhedra with T-linkage.

Xiang Li1, Chuan Zhang, Chenhui Hao

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.

ACS Nano
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel DNA self-assembly strategy using T-junctions for robust nanomotif construction. This method successfully created DNA polyhedra with functional hairpin spikes for chemical attachment.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Structural Biology

Background:

  • Traditional DNA self-assembly often relies on sticky-end cohesion, which can be less stable.
  • Developing robust and versatile DNA nanostructures is crucial for advanced molecular applications.

Purpose of the Study:

  • To report a new strategy for DNA self-assembly using T-junctions instead of sticky ends.
  • To demonstrate the assembly of DNA polyhedra (tetrahedron, octahedron, icosahedron) using this method.
  • To highlight the potential of DNA polyhedra with functional hairpin spikes for biomolecule and nanoparticle conjugation.

Main Methods:

  • Utilizing cross-over-based DNA nanomotifs linked by T-junctions.
  • Assembling DNA polyhedra structures.
  • Characterizing the DNA polyhedra using polyacrylamide gel electrophoresis (PAGE), atomic force microscopy (AFM), and dynamic light scattering (DLS).

Main Results:

  • Successful assembly of DNA tetrahedron, octahedron, and icosahedron structures.
  • Demonstration of well-structured, out-pointing DNA hairpin spikes on the polyhedra.
  • Confirmation of structure and stability through PAGE, AFM, and DLS characterization.

Conclusions:

  • T-junctions provide a stable alternative to sticky ends for DNA nanomotif assembly.
  • The developed DNA polyhedra offer a versatile platform for functionalization with proteins or nanoparticles.
  • This strategy advances the field of DNA nanotechnology for potential applications in molecular assembly and functional materials.