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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.
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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.
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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.
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to 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.
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Related Experiment Video

Updated: Mar 21, 2026

Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging

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Elastic model for dinucleosome structure and energy.

Hashem Fatemi1, Fatemeh Khodabandeh1, Farshid Mohammad-Rafiee1

  • 1Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran.

Physical Review. E
|May 14, 2016
PubMed
Summary
This summary is machine-generated.

The equilibrium structure of dinucleosomes was modeled using elastic principles. DNA linker length does not affect conformational energy, with histone octamers nearly perpendicular and short linkers straight.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Chromatin, the complex of DNA and proteins that forms chromosomes, is crucial for genome organization.
  • Dinucleosomes, the basic repeating unit of chromatin, provide insights into higher-order chromatin structure.
  • Understanding the physical properties of DNA and histone interactions is key to elucidating chromatin folding.

Purpose of the Study:

  • To investigate the equilibrium structure of a dinucleosome using a biophysical model.
  • To determine the influence of linker DNA length on dinucleosome conformation.
  • To analyze the spatial arrangement of histone octamers and linker DNA within the dinucleosome.

Main Methods:

  • Development and application of an elastic model for dinucleosome structure.
  • Inclusion of force and torque balance conditions in the model.
  • Analysis of conformational energy under specific boundary conditions.

Main Results:

  • Dinucleosome conformational energy is independent of linker DNA length.
  • Histone octamers in the dinucleosome are oriented nearly perpendicular to each other.
  • Linker DNA adopts a nearly straight conformation when lengths are short.

Conclusions:

  • DNA elasticity plays a significant role in determining chromatin structure.
  • The geometric arrangement of histone octamers and linker DNA is constrained by physical principles.
  • This study provides a framework for understanding nucleosome interactions and chromatin fiber formation.