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Histone Modification

Histone Modification

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 deacetylase,...

Histone Modification

Histone Modification

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 deacetylase,...

Spreading of Chromatin Modifications

Spreading of Chromatin Modifications

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 is an enzyme that can...

Heterochromatin

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

Heterochromatin

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

The Nucleosome Core Particle

The Nucleosome Core Particle

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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Related Experiment Video

Updated: Jun 16, 2026

An Acetyl-Click Chemistry Assay to Measure Histone Acetyltransferase 1 Acetylation

An Acetyl-Click Chemistry Assay to Measure Histone Acetyltransferase 1 Acetylation

Published on: January 26, 2024

Histone acetylation by HBO1 tightens replication licensing.

Gaganmeet Singh Chadha¹, J Julian Blow

¹Wellcome Trust Centre for Gene Regulation & Expression, University of Dundee, Dow Street, Dundee DD1 5EH, UK.

|February 5, 2010

Summary

Replication licensing, the process of loading Mcm2-7 proteins onto DNA, is promoted by HBO1 acetylating histone H4. This acetylation occurs at replication origins, influencing how DNA replication begins.

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Area of Science:

Molecular Biology
Epigenetics
DNA Replication

Background:

Replication licensing is a critical step in DNA replication, ensuring that the genome is duplicated only once per cell cycle.
The Mcm2-7 complex is essential for establishing the pre-replicative complex (pre-RC) at origins of replication.
Chromatin structure plays a significant role in regulating DNA replication initiation.

Discussion:

This study proposes a novel mechanism where HBO1-mediated acetylation of histone H4 at replication origins facilitates Mcm2-7 loading.
This finding provides a molecular link between histone modifications and the regulation of replication origin firing.
The research sheds light on how epigenetic marks can influence the accessibility and usage of replication origins.

Key Insights:

Histone acetyltransferase HBO1 acetylates histone H4 at replication origins.
HBO1 activity promotes the loading of the Mcm2-7 complex, a key event in replication licensing.
Chromatin acetylation status directly impacts the efficiency of origin usage during DNA replication.

Outlook:

Further investigation into the specific roles of HBO1 and histone H4 acetylation in different cellular contexts.
Exploring potential therapeutic targets related to HBO1 activity for controlling cell proliferation.
Understanding the interplay between replication licensing and other epigenetic regulatory mechanisms.