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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.
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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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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
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Trimethyllysine: From Carnitine Biosynthesis to Epigenetics.

Marijn N Maas1, Jordi C J Hintzen1, Miriam R B Porzberg1

  • 1Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark.

International Journal of Molecular Sciences
|December 16, 2020
PubMed
Summary

Trimethyllysine is vital for carnitine biosynthesis and epigenetics, influencing protein function and cellular processes. Its methylation states are dynamically regulated and recognized by reader proteins, impacting health and disease.

Keywords:
carnitineepigeneticserasersmethylationpost-translational modificationsprotein lysine demethylasesprotein lysine methyltransferasesreaderstrimethyllysinewriters

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Area of Science:

  • Biochemistry
  • Epigenetics
  • Molecular Biology

Background:

  • Trimethyllysine is a post-translationally modified amino acid crucial for carnitine biosynthesis.
  • It plays a significant role in regulating epigenetic processes, particularly through histone modifications.
  • Aberrant protein methylation is implicated in diseases like cancer and inflammatory disorders.

Purpose of the Study:

  • To review biomolecular studies on trimethyllysine's functions.
  • To explore enzymatic pathways for trimethyllysine synthesis and removal.
  • To examine trimethyllysine recognition by reader proteins and its impact on nucleosome assembly.

Main Methods:

  • Review of existing biomolecular studies.
  • Analysis of enzymatic reactions controlling trimethyllysine.
  • Investigation of reader protein interactions and nucleosome assembly roles.

Main Results:

  • Trimethyllysine's dual role in carnitine synthesis and epigenetics is highlighted.
  • Dynamic control of protein lysine methylation by methyltransferases and demethylases affects protein function.
  • Reader proteins' ability to distinguish methylation states initiates downstream signaling.

Conclusions:

  • Trimethyllysine is a key regulator of fundamental biological processes.
  • Understanding trimethyllysine dynamics is crucial for deciphering epigenetic regulation.
  • Dysregulation of trimethyllysine pathways contributes to various pathologies.