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Related Concept Videos

Protein Networks02:26

Protein Networks

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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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.
These groups modify specific amino acids in a protein....
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Related Experiment Video

Updated: Sep 27, 2025

Quantification of Site-specific Protein Lysine Acetylation and Succinylation Stoichiometry Using Data-independent Acquisition Mass Spectrometry
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A Nutrient-Based Cellular Model to Characterize Acetylation-Dependent Protein-Protein Interactions.

Jérémy Loehr1,2, Pata-Eting Kougnassoukou Tchara1,2,3, Kevin Gonthier1,2

  • 1Department of Molecular Medicine and Cancer Research Center, Université Laval, Quebec, QC, Canada.

Frontiers in Molecular Biosciences
|April 11, 2022
PubMed
Summary

Researchers created a new cell model to study how histone acetylation affects gene expression. This model allows for the characterization of bromodomain-dependent interactions on chromatin.

Keywords:
ATP citrate lyaseacetateacetyl-CoAbromodomainchromatinfunctional proteomicsinteractome mappinglysine acetylation

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Proteomics

Background:

  • Cellular homeostasis depends on precise gene expression, regulated by histone modifications like lysine acetylation (Kac).
  • Acetylated histones serve as binding sites for bromodomain (BRD)-containing proteins, crucial for organizing transcriptional regulatory networks.
  • Understanding BRD-dependent interactions is key to deciphering gene expression control.

Purpose of the Study:

  • To develop a novel cellular system for investigating bromodomain (BRD)-dependent chromatin interactions.
  • To enable functional proteomics studies focused on lysine acetylation (Kac) reader proteins.

Main Methods:

  • Genome editing was used to knock out ATP citrate lyase (ACLY), an enzyme essential for acetyl-CoA production.
  • A cell line was established where histone acetylation levels are controlled by acetate availability in the culture medium.
  • This model facilitates the study of histone acetylation dynamics and associated protein interactions.

Main Results:

  • The engineered cell line demonstrated rapid catabolism of acetylated histones upon acetate withdrawal, restoring acetyl-CoA levels.
  • This system enabled the characterization of bromodomain (BRD)-dependent interaction networks on chromatin through functional proteomics.
  • The study provides insights into the dynamic regulation of chromatin by histone acetylation.

Conclusions:

  • The developed cellular model offers a powerful tool for dissecting bromodomain (BRD)-mediated chromatin regulation.
  • This approach advances the study of epigenetics and gene expression by linking histone acetylation to protein interaction networks.
  • The findings contribute to a deeper understanding of the molecular mechanisms governing cellular homeostasis.