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Related Concept Videos

The Nucleosome Core Particle01:12

The Nucleosome Core Particle

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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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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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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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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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Interplay between histone H1 structure and function.

Alicia Roque1, Inma Ponte1, Pedro Suau1

  • 1Departamento de Bioquímica y Biología Molecular, Facultad de Biociencias, Universidad Autónoma de Barcelona, Spain.

Biochimica Et Biophysica Acta
|September 30, 2015
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Summary
This summary is machine-generated.

Histone H1 linker proteins maintain chromatin structure and regulate genes. Recent studies explore H1 domains, DNA interactions, and the carboxy-terminal domain

Keywords:
Charge neutralizationChromatin condensationFoldingH1 phosphorylationHydrophobic interactionsStructural domains of H1

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Area of Science:

  • Chromatin biology
  • Molecular genetics
  • Structural biology

Background:

  • Histone H1 linker proteins are crucial for higher-order chromatin structure and gene regulation.
  • Histone H1 exhibits multiple isoforms, evolutionary variability, and diverse post-translational modifications.

Purpose of the Study:

  • To review recent advancements in understanding histone H1 domain folding and structure.
  • To emphasize histone H1 interactions with DNA.
  • To discuss the role of intrinsic disorder and hydrophobic interactions in the carboxy-terminal domain (CTD) function.

Main Methods:

  • Review of recent literature on histone H1 structure and function.
  • Analysis of folding properties, including intrinsic disorder and hydrophobic interactions.
  • Consideration of macromolecular crowding effects and post-translational modifications like phosphorylation.

Main Results:

  • The carboxy-terminal domain (CTD) folding is influenced by intrinsic disorder and hydrophobic interactions.
  • Macromolecular crowding can induce a molten globule-state in the CTD.
  • Phosphorylation by cyclin-dependent kinases affects CTD structure, chromatin condensation, and oligomerization.

Conclusions:

  • Histone H1 structure, particularly the CTD, is dynamic and influenced by cellular conditions and modifications.
  • Understanding these structural aspects is key to elucidating H1's roles in gene regulation and chromatin organization.
  • Extranuclear functions, such as interaction with β-amyloid peptide, are also highlighted.