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Related Concept Videos

Nucleosome Remodeling02:54

Nucleosome Remodeling

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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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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.
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Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
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Featuring the nucleosome surface as a therapeutic target.

Isabel Torres Gomes da Silva1, Paulo Sergio Lopes de Oliveira2, Guilherme Martins Santos1

  • 1Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, School of Health Sciences, University of Brasilia, Brasilia, 70919-970, Brazil.

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Summary

Nucleosome-binding proteins (NBPs) and the H4 tail compete for binding sites on chromatin. This competition highlights the nucleosome surface as a potential therapeutic target for developing new molecules.

Keywords:
acidic patchbinding proteinchromatinnucleosomestructuretherapeutic target

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Epigenetics

Background:

  • Chromatin, composed of nucleosomes, regulates gene expression and genome stability.
  • Nucleosome-binding proteins (NBPs) and the histone H4 tail are crucial for chromatin structure and function.
  • NBPs and the H4 tail peptide share a common binding site on the nucleosome's acidic region.

Purpose of the Study:

  • To review emerging insights into nucleosome structure and molecular mechanisms.
  • To discuss the nucleosome surface as a potential therapeutic target.
  • To explore the development and impact of exogenous nucleosome-binding molecules (eNBMs).

Main Methods:

  • Review of recently revealed complex nucleosome:NBP structures.
  • Analysis of NBP-binding sites on the nucleosome surface.
  • Discussion of therapeutic potential and molecular development strategies.

Main Results:

  • Characterization of specific NBP-binding sites on the nucleosome surface.
  • Identification of the competitive binding interaction between NBPs and the H4 tail.
  • Emerging structural data provides new molecular insights into nucleosome function.

Conclusions:

  • The nucleosome surface presents a promising target for therapeutic intervention.
  • Exogenous nucleosome-binding molecules (eNBMs) offer potential for modulating chromatin-related processes.
  • Continued structural and mechanistic studies are vital for advancing therapeutic development.