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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,...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

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...

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Related Experiment Video

Updated: Jun 26, 2026

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

Published on: January 26, 2018

Lysine methylation as a bidirectional switch.

Bao Quang Gia Le¹, Ana Villalobos Galindo¹, Monika Raj¹

¹Department of Chemistry, Emory University, Atlanta, GA 30322, USA.

Cell Chemical Biology

|June 24, 2026

Summary

This summary is machine-generated.

Lysine methylation on non-histone proteins can control protein stability via the Ub-proteasome system (UPS). This bidirectional switch determines protein degradation or stabilization based on cellular context and interpreter availability.

Keywords:

PTM crosstalk lysine methylation methyl-degrons protein stability ubiquitin-proteasome system

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Last Updated: Jun 26, 2026

Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

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Published on: January 26, 2018

Application of MassSQUIRM for Quantitative Measurements of Lysine Demethylase Activity

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Published on: March 11, 2012

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

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Published on: September 7, 2017

Area of Science:

Biochemistry
Molecular Biology
Proteomics

Background:

Lysine methylation is traditionally associated with chromatin regulation.
Emerging evidence reveals its role in non-histone protein regulation.
The Ub-proteasome system (UPS) is a key pathway for protein degradation.

Purpose of the Study:

To define the bidirectional nature of lysine methylation in programming protein lifetime.
To organize the mechanisms of methyl-degrons and methyl-stabilizers.
To identify features that dictate methyl-mark outcomes and explore chemical biology applications.

Main Methods:

Literature curation and analysis of lysine methylation.
Framework development for methyl-degron and methyl-stabilizer mechanisms.
Identification of recurring modular architectures and predictive features.

Main Results:

Lysine methylation acts as a bidirectional switch, directing protein degradation or stabilization.
Both Kme1 and Kme2 methylation exhibit bidirectional control, with Kme1 prevalent in degron pathways.
Kme3 methylation exclusively supports protein stabilization.
Recurring motifs and features influencing methyl-site fate were identified.

Conclusions:

Lysine methylation on non-histone proteins is a dynamic regulator of protein stability.
Understanding this bidirectional switch offers insights into protein homeostasis.
Chemical biology tools can be developed to manipulate this switch for therapeutic purposes.