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Related Concept Videos

Histone Modification02:32

Histone Modification

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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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Histone Modification02:32

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The Nucleosome Core Particle01:12

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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.
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...
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The Nucleosome Core Particle02:10

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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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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.
Writers
The writer...
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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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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
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Histone sumoylation and chromatin dynamics.

Hong-Yeoul Ryu1, Mark Hochstrasser2

  • 1School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, College of National Sciences, Kyungpook National University, Daegu 41566, Republic of Korea.

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Histone sumoylation, a key post-translational modification (PTM), dynamically regulates gene expression and chromatin structure. Recent findings reveal its diverse roles beyond transcription suppression, impacting DNA repair and mitosis.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Gene expression and chromatin structure are regulated by histone post-translational modifications (PTMs).
  • Histone sumoylation was previously thought to solely repress transcription.
  • Emerging evidence highlights diverse roles for histone sumoylation in gene regulation and DNA repair.

Purpose of the Study:

  • To review recent findings on histone sumoylation.
  • To explore its coordination with other histone PTMs and RNA polymerase II modifications.
  • To elucidate its role in chromatin dynamics.

Main Methods:

  • Proteomics and genomics approaches were utilized.
  • Analysis of histone modifications and their functional consequences.
  • Integration of data on histone PTMs and RNA polymerase II carboxy-terminal domain (RNAPII-CTD) modifications.

Main Results:

  • Histone sumoylation participates in cotranscriptional processes like chromatin remodeling and transcript elongation.
  • It plays a role in blocking cryptic transcription initiation.
  • Sumoylation of histone variants is crucial for DNA double-strand break (DSB) repair and chromosome segregation.

Conclusions:

  • Histone sumoylation is a versatile regulator of chromatin dynamics.
  • It integrates with other PTMs to fine-tune gene expression and cellular processes.
  • Understanding histone sumoylation is key to comprehending complex epigenetic regulation.