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DNA as a Genetic Template

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...

DNA as a Genetic Template

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 Helix

The DNA Helix

The DNA Helix

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 Nucleosome

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...

Chromatin Packaging

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...

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Related Experiment Video

Updated: May 14, 2026

Folding and Characterization of a Bio-responsive Robot from DNA Origami

Folding and Characterization of a Bio-responsive Robot from DNA Origami

Published on: December 3, 2015

Optimizing DNA nanotechnology through coarse-grained modeling: a two-footed DNA walker.

Thomas E Ouldridge¹, Rollo L Hoare, Ard A Louis

¹Department of Physics, Rudolph Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, United Kingdom. t.ouldridge1@physics.ox.ac.uk

|February 19, 2013

Summary

A new DNA model aids in designing complex nanoscale systems. Applying track tension and optimizing fuel detachment significantly improves DNA walker efficiency and operation.

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Last Updated: May 14, 2026

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Area of Science:

Nanotechnology
Biophysics
Computational Biology

Background:

DNA nanotechnology offers potential for nanoscale structures.
Designing complex DNA systems requires robust models.
Existing models may not fully capture DNA duplex formation dynamics.

Purpose of the Study:

To validate a coarse-grained DNA model for complex nanotechnological systems.
To investigate the operational mechanisms of a two-footed DNA walker.
To identify design strategies for optimizing DNA walker performance.

Main Methods:

Development and application of a coarse-grained DNA model.
Simulations of a two-footed DNA walker on a reusable track.
Analysis of DNA duplex formation, track tension, and fuel detachment effects.

Main Results:

Track tension influences walker stepping bias and recovery from overstepped states.
Spent fuel detachment dynamics significantly impact walker rebinding, efficiency, and speed.
The model provides insights into optimizing DNA walker design.

Conclusions:

The coarse-grained DNA model is effective for analyzing complex nanodevices.
Tension and fuel detachment are critical parameters for DNA walker control.
Proposed modifications can enhance DNA walker efficiency and operation.