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Protein Networks02:26

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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: Nov 26, 2025

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay PCA in Living Cells
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Genetic interaction mapping informs integrative structure determination of protein complexes.

Hannes Braberg1,2, Ignacia Echeverria1,2,3, Stefan Bohn1,2,4

  • 1Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA.

Science (New York, N.Y.)
|December 11, 2020
PubMed
Summary

This study introduces a novel method using genetic interactions to determine protein complex structures in vivo. This approach accurately models protein structures, complementing existing techniques for biological insights.

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Area of Science:

  • Structural Biology
  • Systems Biology
  • Genetics

Background:

  • Understanding protein complex structures is essential for elucidating cellular functions.
  • Current structure determination methods can be augmented with complementary data sources.

Purpose of the Study:

  • To develop and validate an integrative structure determination approach using in vivo genetic interaction measurements.
  • To determine the structures of key protein complexes, including the yeast histone H3-H4 complex and subunits of RNA polymerases.

Main Methods:

  • Constructing phenotypic profiles for point mutations and gene deletions under various conditions.
  • Converting profile similarities into distance restraints between mutated residues.
  • Applying the method to yeast histone H3-H4, yeast RNA polymerase II (Rpb1-Rpb2), and bacterial RNA polymerase (RpoB-RpoC).

Main Results:

  • Successfully determined the structure of the yeast histone H3-H4 complex using genetic interaction data.
  • Achieved structural accuracy comparable to methods using chemical cross-links.
  • Demonstrated improved model accuracy and precision when combining genetic interaction restraints with chemical cross-links.

Conclusions:

  • The described integrative approach efficiently determines protein complex structures using in vivo genetic observations.
  • This method provides a valuable tool to enhance existing structural biology techniques.
  • The findings offer new insights into the structures of essential cellular machinery.