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Histone Modification02:32

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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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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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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
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PCAF promotes R-loop resolution via histone acetylation.

Seo Yun Lee1, Soo Hyeon Lee1, Nak Hun Choi1

  • 1Department of Life Science and Multidisciplinary Genome Institute, Hallym University, Chuncheon 24252, Republic of Korea.

Nucleic Acids Research
|June 27, 2024
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Summary
This summary is machine-generated.

PCAF depletion increases R-loops and genome instability. PCAF recruits repair proteins to resolve R-loops, maintaining genome stability and preventing diseases like cancer.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • R-loops are nucleic acid structures that can cause genome instability.
  • Histone acetylation, regulated by PCAF, is crucial for genome stability.
  • Dysregulation of R-loops and genome stability is linked to diseases, including cancer.

Purpose of the Study:

  • To investigate the role of PCAF in R-loop resolution and genome stability.
  • To elucidate the molecular mechanisms by which PCAF maintains genome integrity.

Main Methods:

  • Depletion of PCAF in cellular models.
  • Analysis of R-loop formation during transcription.
  • Assessment of histone acetylation marks (H4K8ac).
  • Recruitment assays for DNA repair proteins (MRE11, EXO1, FANCM, BLM).

Main Results:

  • PCAF depletion significantly increased R-loop formation, particularly during transcription.
  • PCAF facilitates H4K8 acetylation, which is essential for recruiting DNA repair proteins.
  • PCAF-mediated recruitment of MRE11, EXO1, and Fanconi anemia proteins is critical for R-loop resolution.
  • Loss of PCAF compromises genome stability due to unresolved R-loops.

Conclusions:

  • PCAF plays a vital role in resolving R-loops and maintaining genome stability.
  • PCAF, histone acetylation, and DNA repair pathways (including FA proteins) form a collaborative network for R-loop resolution.
  • These findings offer insights into disease mechanisms and potential therapeutic targets for genome instability-related disorders.