Video Experimental Relacionado
Updated: Jul 5, 2026

09:52
Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
Published on: January 31, 2019
La organización de la cromatina bacteriana por la proteína H-NS desentrañada mediante la manipulación de doble ADN
Remus T Dame1, Maarten C Noom, Gijs J L Wuite
1Department of Physics and Astronomy and Laser Centre, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands. gwuite@nat.vu.nl
Nature
|November 17, 2006
Resumen
La proteína estructuradora nucleoide similar a la histona (H-NS) une dinámicamente las moléculas de ADN, organizando los nucleoides bacterianos. Este estudio revela el H-NS.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La biofísica es la biofísica.
- La genómica es la genómica.
Sus antecedentes:
- Los organismos procariotas y eucariotas utilizan proteínas puentes de ADN para la regulación genética y la organización estructural.
- El nucleoide bacteriano, una estructura compleja, está conformado por proteínas puentes de ADN no específicas como las proteínas H-NS, Lrp y SMC.
- Comprender los detalles mecánicos y moleculares de las interacciones no específicas ADN-proteína sigue siendo un desafío.
Objetivo del estudio:
- Investigar la organización dinámica y las propiedades de unión al ADN de la proteína asociada al nucleóide H-NS.
- Para aclarar el papel de H-NS en la compactación y accesibilidad del nucleoide bacteriano.
- Establecer un nuevo enfoque experimental para el estudio de las interacciones ADN-ADN mediadas por proteínas.
Principales métodos:
- Desarrollo de un instrumento óptico de doble doble para la manipulación independiente de dos moléculas de ADN.
- Aplicación de la espectroscopia de fuerza dinámica para analizar proteínas no específicas de unión al ADN.
- Investigación sistemática de las interacciones de la proteína estructurante nucleoide similar a la histona (H-NS) con el ADN.
Principales resultados:
- Se demostró que el H-NS se organiza dinámicamente entre dos moléculas de ADN, alineándose con el tono helicoidal del ADN.
- Determinó el panorama energético de la interacción H-NS-ADN utilizando espectroscopia de fuerza dinámica.
- Proporcionó información sobre la compactación dinámica y la accesibilidad del nucleoide bacteriano.
Conclusiones:
- H-NS juega un papel crucial en la organización dinámica y la compactación del nucleoide bacteriano.
- La técnica de pinzas ópticas desarrollada ofrece una plataforma versátil para estudiar las proteínas puentes del ADN y las interacciones complejas del ADN.
- Los hallazgos contribuyen a comprender la organización del genoma bacteriano y la accesibilidad para los procesos celulares.
Videos de Conceptos Relacionados
Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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.
Duplication of Chromatin Structure
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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...
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...
Nucleoid
The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...

