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Related Concept Videos

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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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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.
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Updated: Aug 27, 2025

Identifying Protein-protein Interaction Sites Using Peptide Arrays
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Peptide Microarray-Based Protein Interaction Studies Across Affinity Ranges: Enzyme Stalling, Cross-Linking,

Clemens Schulte1, Vladimir Khayenko1, Hans Michael Maric2

  • 1Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Wuerzburg, Wuerzburg, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|September 24, 2022
PubMed
Summary

This study presents an updated peptide microarray protocol for precise quantification of transient protein-protein interactions, including challenging targets like HDACs. The enhanced method improves sensitivity and robustness for reliable binding profiling.

Keywords:
Cross-linkingDepletionEnzyme stallingInteraction profilingNeutralizationPeptide microarrays

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Peptide microarrays are widely used for studying protein-protein interactions.
  • Investigating transiently binding proteins and precise quantification remain challenging with current array methods.

Purpose of the Study:

  • To present an updated protocol for peptide microarray preparation and use.
  • To enable simple semi-quantitative and precise measurements across a wide range of affinities.
  • To facilitate binding profiling of both recombinant and endogenous proteins.

Main Methods:

  • Mass spectrometric controlled preparation of peptide microarrays in μSPOT format.
  • Application of microarrays for binding profiling of various protein types.
  • Utilizing cross-linking, blocking, and enzyme stalling to enhance sensitivity.
  • Implementing in situ on-chip binding neutralization for improved robustness.

Main Results:

  • Demonstrated successful preparation and application of updated peptide microarrays.
  • Achieved enhanced sensitivity and robustness in binding readouts.
  • Integrated precise biophysical binding readouts alongside traditional assays.
  • Enabled reliable profiling of transient protein interactions, including HDACs.

Conclusions:

  • The updated peptide microarray protocol overcomes limitations in studying transient protein interactions.
  • The protocol allows for precise quantification and robust binding profiling.
  • This advancement provides a valuable tool for biochemical and proteomic research.