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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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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Related Experiment Video

Updated: Sep 27, 2025

Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
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Nucleosome destabilization by polyamines.

Laszlo Imre1, Erfaneh Firouzi Niaki1, Rosevalentine Bosire1

  • 1Department of Biophysics and Cell Biology, University of Debrecen, Faculty of Medicine Debrecen, H-4032, Hungary.

Archives of Biochemistry and Biophysics
|April 8, 2022
PubMed
Summary
This summary is machine-generated.

Polyamines (PAs) significantly destabilize nucleosomes, impacting gene control. This effect, observed in cell nuclei, is dependent on pH and salt concentration, highlighting PAs' role in chromatin regulation.

Keywords:
ChromatinHistoneNCI-60NucleosomePolyamineStability

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • The precise functions of nuclear polyamines (PAs) remain unclear.
  • Nucleosome stability is a critical determinant of eukaryotic gene expression regulation.

Purpose of the Study:

  • To investigate the impact of polyamines on nucleosome stability in situ.
  • To elucidate the molecular mechanisms underlying polyamine-chromatin interactions.

Main Methods:

  • Quantitative microscopy was employed to assess nucleosome stability in agarose-embedded nuclei of H2B-GFP HeLa cells.
  • Ethidium bromide displacement assays were used to demonstrate polyamine binding to DNA.

Main Results:

  • Polyamines (spermine, spermidine, putrescine) robustly destabilized nucleosomes at millimolar concentrations.
  • This destabilization was pH and salt concentration-dependent but significant at neutral pH.
  • Polyamines bind to DNA, evidenced by ethidium bromide displacement, without causing DNA breaks.

Conclusions:

  • Polyamines directly influence nucleosome stability, suggesting a role in epigenetic regulation.
  • PA-DNA interactions may affect DNA methylation patterns, potentially linking PA metabolism to gene expression.
  • Further research into PA-mediated epigenetic modifications is warranted.