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Related Concept Videos

Protein Networks02:26

Protein Networks

3.7K
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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Protein-Drug Binding: Determination Methods01:22

Protein-Drug Binding: Determination Methods

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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
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Related Experiment Video

Updated: May 4, 2026

Identification of Protein Interaction Partners in Mammalian Cells Using SILAC-immunoprecipitation Quantitative Proteomics
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Identification of Protein Interaction Partners in Mammalian Cells Using SILAC-immunoprecipitation Quantitative Proteomics

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Methods for analyzing and quantifying protein-protein interaction.

Syafrizayanti1, Christian Betzen, Jörg D Hoheisel

  • 1Division of Functional Genome Analysis, Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 580, Heidelberg, Germany.

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Summary

Understanding protein-protein interactions is crucial for cellular functions. This review overviews methods for analyzing these complex interactions, highlighting the need for quantitative and high-throughput techniques.

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A Protocol for the Identification of Protein-protein Interactions Based on 15N Metabolic Labeling, Immunoprecipitation, Quantitative Mass Spectrometry and Affinity Modulation
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A Protocol for the Identification of Protein-protein Interactions Based on 15N Metabolic Labeling, Immunoprecipitation, Quantitative Mass Spectrometry and Affinity Modulation
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A Protocol for the Identification of Protein-protein Interactions Based on 15N Metabolic Labeling, Immunoprecipitation, Quantitative Mass Spectrometry and Affinity Modulation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Genome sequencing has identified most human proteins, but knowledge of their interactions remains limited.
  • Protein-protein interactions are essential for cellular activities and are influenced by various protein isoforms.
  • Analyzing complex interaction networks requires methods beyond those limited to few partners.

Purpose of the Study:

  • To provide an overview of available methodologies for analyzing protein-protein interactions.
  • To highlight the challenges in studying complex interaction patterns and quantitative affinities.
  • To discuss the varying accuracy, reliability, reproducibility, and throughput of current techniques.

Main Methods:

  • This article reviews existing techniques for protein-protein interaction analysis.
  • Methodologies range from qualitative binding demonstrations to quantitative affinity characterization.
  • The focus is on techniques suitable for complex cellular systems and high-throughput analysis.

Main Results:

  • Current techniques for protein-protein interaction analysis vary significantly in performance.
  • There is a need for methods that offer quantitative insights into interaction intensities.
  • High-throughput and reliable methods are essential for understanding cellular systems.

Conclusions:

  • Accurate and quantitative analysis of protein-protein interactions is critical for understanding cellular processes.
  • Further development of high-throughput methodologies is needed to meet the demands of complex biological systems.
  • The choice of method depends on the required accuracy, reliability, and throughput for interaction studies.