Related Experiment Video
Updated: Jul 25, 2026
12:16
Robust 3D DNA FISH Using Directly Labeled Probes
Published on: August 15, 2013
Energy localization in the Peyrard-Bishop DNA model.
Jayme De Luca1, Elso Drigo Filho, Antonio Ponno
1Universidade Federal de São Carlos, Departamento de Física, Rodovia Washington Luis, km 235, São Carlos,13565-905-São Paulo, Brazil. deluca@df.ufscar.br
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2004
Summary
Localized DNA energy excitations were found to exist. These occur when nonlinear dynamics match the linear chain
Area of Science:
- * Biophysics
- * Nonlinear Dynamics
- * Computational Physics
Background:
- * The Peyrard-Bishop model simulates DNA dynamics using an oscillator chain.
- * Understanding energy localization is crucial for DNA's thermal and mechanical properties.
Purpose of the Study:
- * To investigate conditions for energy localization in a finite DNA oscillator chain.
- * To identify the relationship between nonlinear dynamics and energy localization.
- * To determine the minimum Morse parameter for localized excitations.
Main Methods:
- * Numerical simulations of the Peyrard-Bishop oscillator chain.
- * Application of an information entropy criterion for localization.
- * Canonical perturbation theory for supercritical masses.
Main Results:
- * Localized excitations exist when subgroup oscillation frequency is within the linear chain's reactive band.
- * A minimum Morse parameter (µ > 2.25) is predicted and numerically verified.
- * An energy threshold for localized excitations was calculated and agrees with numerical findings.
Conclusions:
- * Energy can be localized in DNA models under specific nonlinear conditions.
- * The Morse parameter and frequency matching are key factors for energy localization.
- * Findings provide insights into DNA's energy transport and stability mechanisms.
Related Concept Videos
01:16The DNA Helix
Overview
01:49Conserved Binding Sites
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
02:05DNA 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...
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
01:02Long-patch Base Excision Repair
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
01:07The 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...