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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.
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Protein-protein Interfaces02:04

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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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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Mapping Dysfunctional Protein-Protein Interactions in Disease
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Phospho-tyrosine dependent protein-protein interaction network.

Arndt Grossmann1, Nouhad Benlasfer1, Petra Birth1

  • 1Otto-Warburg Laboratory, Max-Planck Institute for Molecular Genetics (MPIMG), Berlin, Germany.

Molecular Systems Biology
|March 28, 2015
PubMed
Summary

This study identifies 292 novel phospho-tyrosine dependent protein-protein interactions (pY-PPIs) using a large-scale yeast two-hybrid system. These interactions are crucial for cancer-related signaling pathways and cellular phenotypes.

Keywords:
cancer signalingnetwork biologypost‐translational protein modificationyeast two‐hybrid

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Post-translational protein modifications, like tyrosine phosphorylation, are crucial for regulating protein-protein interactions (PPIs).
  • These PPIs are vital for signal transduction and determining cellular functions.
  • Understanding phospho-tyrosine (pY)-dependent PPIs is key to deciphering complex cellular processes.

Purpose of the Study:

  • To systematically identify and characterize phospho-tyrosine (pY)-dependent protein-protein interactions (PPIs) on a large scale.
  • To investigate the mechanisms and biological relevance of these pY-PPIs, particularly in cancer-related pathways.

Main Methods:

  • An adapted yeast two-hybrid system was employed using human protein kinases to analyze pY-dependent PPIs.
  • Co-immunoprecipitation experiments in mammalian cells were used for validation.
  • Network analysis and binding assays were performed to understand interaction mechanisms and functional impact.

Main Results:

  • Identified 292 novel pY-dependent PPIs with high specificity.
  • Validated a significant portion of these interactions experimentally.
  • Discovered that while some pY-PPIs involve known motifs, many utilize alternative recognition modes.
  • Network analysis linked pY-mediated events to cancer-related signaling and cell growth pathways.

Conclusions:

  • The study provides a comprehensive map of pY-dependent PPIs, revealing novel interactions and their regulatory mechanisms.
  • pY-PPIs are integral to cancer-associated signaling pathways.
  • Specific pY-dependent interactions, exemplified by TSPAN2 with GRB2 or PIK3R3, can directly influence cellular phenotypes relevant to cancer.