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Updated: Jul 20, 2026

08:48
Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
Published on: October 13, 2011
Summary
Double-wide pyrimidine bases can form specific DNA structures. These helical complexes offer new possibilities for DNA nanotechnology and molecular assembly.
Area of Science:
- Biochemistry
- Molecular Biology
- Supramolecular Chemistry
Background:
- Traditional DNA structures are formed by single-width bases.
- The assembly of larger molecular structures is crucial for nanotechnology.
Discussion:
- Double-wide pyrimidine bases demonstrate self-assembly into stable, helical DNA complexes.
- The sequence-specific nature of these complexes allows for precise structural control.
Key Insights:
- Novel DNA building blocks can create higher-order structures.
- This expands the toolkit for designing custom DNA architectures.
Outlook:
- Potential applications in DNA nanotechnology, molecular computing, and targeted drug delivery.
- Further research into the properties and applications of these novel DNA complexes is warranted.
Related Concept Videos
Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
DNA Packaging
Overview
DNA Packaging
Overview
Genomic DNA in Eukaryotes
Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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...
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...

