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Updated: Jun 20, 2026
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Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
Published on: December 26, 2020
Genetically encoding N(epsilon)-methyl-L-lysine in recombinant histones
Duy P Nguyen1, Maria M Garcia Alai, Prashant B Kapadnis
1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.
Journal of the American Chemical Society
|September 24, 2009
Summary
Researchers developed a new method for precisely adding methyl groups to histone proteins. This technique enables the study of how specific histone methylation marks, like H3K9me1, influence biological processes such as gene regulation.
Area of Science:
- Biochemistry
- Epigenetics
- Molecular Biology
Background:
- Lysine methylation is a key post-translational modification of histones.
- It plays critical roles in epigenetic regulation, including heterochromatin formation and transcriptional control.
- Current methods lack the ability to synthesize proteins with quantitative, site-specific methylation.
Purpose of the Study:
- To develop a general method for the quantitative installation of N(epsilon)-methyl-L-lysine at defined positions in recombinant histones.
- To demonstrate the utility of this method for studying methylation-dependent protein interactions.
Main Methods:
- Developed a novel chemical synthesis strategy for site-specific histone methylation.
- Applied the method to create recombinant histone H3 monomethylated on K9 (H3K9me1).
- Utilized the modified histone to investigate HP1 binding.
Main Results:
- Successfully demonstrated a general method for quantitative, site-specific lysine methylation in recombinant histones.
- Showcased the application of this method by analyzing HP1 binding to H3K9me1.
- Established a tool for further research into methylation-dependent biological phenomena.
Conclusions:
- The developed method allows for precise control over histone methylation.
- This advancement facilitates the investigation of molecular mechanisms underlying histone methylation-mediated cellular processes.
- The strategy holds significant potential for broad applications in epigenetics research.
Related Concept Videos
02:32Histone 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,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:32Histone 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,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading 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
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
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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...
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...
02:10The 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.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...