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Related Concept Videos

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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Related Experiment Video

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Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
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Identifying Protein Interactions with Histone Peptides Using Bio-layer Interferometry.

Bingbing Ren1, Ahmed Mahmoud Mohammed Sayed2, Hwei Ling Tan1,3

  • 1Department of Biochemistry, National University of Singapore, Yong Loo Lin School of Medicine, Singapore.

Bio-Protocol
|August 16, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to measure how strongly and quickly proteins bind to histone modifications. This technique helps understand gene regulation and DNA repair mechanisms.

Keywords:
Bio-layer interferometryBiosensorHistone post-translational modificationLabel freePeptideProtein interactionRecombinant protein

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Biochemistry

Background:

  • Histone post-translational modifications (PTMs) are crucial regulators of gene transcription, cell division, and DNA repair.
  • These modifications primarily function by influencing the binding of specific reader proteins to chromatin.
  • Understanding these interactions is key to deciphering cellular regulatory networks.

Purpose of the Study:

  • To develop and present a reliable protocol for quantifying the affinity and interaction kinetics of histone peptides with recombinant proteins.
  • To provide a method for researchers to study the molecular basis of histone PTM recognition.

Main Methods:

  • Utilized Bio-layer interferometry (BLI) for real-time measurement of binding events.
  • Employed recombinant proteins and synthesized histone peptides as interaction partners.
  • Developed a standardized protocol for affinity and kinetic analysis.

Main Results:

  • Successfully measured the binding affinity (KD) and kinetic parameters (kon, koff) between various histone peptides and specific reader proteins.
  • Demonstrated the robustness and reproducibility of the BLI-based protocol.
  • Provided quantitative data on histone-protein interactions.

Conclusions:

  • The presented Bio-layer interferometry protocol offers a powerful and accessible tool for characterizing histone PTM interactions.
  • This method facilitates a deeper understanding of chromatin regulation and epigenetic mechanisms.
  • Enables high-throughput screening and detailed kinetic analysis of protein-chromatin interactions.