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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...

Nucleosome Remodeling

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...

The Nucleosome Core Particle

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...

Genomic DNA in Eukaryotes

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.

DNA Packaging

DNA Packaging

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Related Experiment Video

Updated: May 30, 2025

Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques

Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques

Published on: September 6, 2024

Beyond the mono-nucleosome.

Juliana Kikumoto Dias¹, Sheena D'Arcy¹

¹Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas, 75080, USA.

Biochemical Society Transactions

|January 31, 2025

Summary

This summary is machine-generated.

The mono-nucleosome model offers limited insights into chromatin structure. Multi-nucleosome arrays provide a more accurate model for studying chromatin folding, function, and dynamics, revealing new regulatory mechanisms.

Keywords:

chromatin chromatin remodeler multi-nucleosome array nucleosome

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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques

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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

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Area of Science:

Molecular Biology
Epigenetics
Structural Biology

Background:

Nucleosomes are fundamental units of chromatin, regulating DNA accessibility for crucial cellular processes.
The mono-nucleosome system is widely used but lacks higher-order structural features.
Essential chromatin features like folding, nucleosome interactions, and linker DNA dynamics are not captured by mono-nucleosomes.

Purpose of the Study:

To review discoveries made using the mono-nucleosome model.
To highlight the limitations of the mono-nucleosome system in vitro.
To emphasize the need for and potential of multi-nucleosome array systems.

Main Methods:

Review of existing literature on mono-nucleosome studies.
Introduction of di-, tri-, and tetra-nucleosome arrays as advanced models.
Application of in-solution biophysical techniques to multi-nucleosome arrays.

Main Results:

Mono-nucleosome studies have yielded significant findings but are incomplete.
Multi-nucleosome arrays reveal effects of linker DNA length, binding partners, and histone modifications.
These arrays offer a more chromatin-like environment for studying complex interactions.

Conclusions:

The mono-nucleosome model is insufficient for fully understanding chromatin.
Multi-nucleosome arrays are essential for exploring higher-order chromatin structure and function.
Future research should leverage multi-nucleosome arrays and biophysical methods to uncover novel chromatin regulatory mechanisms.