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Related Experiment Videos

Subunit architecture of multimeric complexes isolated directly from cells.

Helena Hernández1, Andrzej Dziembowski, Thomas Taverner

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.

EMBO Reports
|May 27, 2006
PubMed
Summary

This study combines tandem affinity purification and mass spectrometry to analyze complex protein assemblies. The new method reveals detailed stoichiometry and subunit interactions in large, heterogeneous cellular complexes.

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Area of Science:

  • Proteomics
  • Structural Biology
  • Biochemistry

Background:

  • Mass spectrometry (MS)-based proteomics has identified many in vivo protein complexes.
  • Standard proteomics methods struggle with stoichiometry, subunit interactions, and organization of heterogeneous or low-abundance complexes.

Purpose of the Study:

  • To develop a robust method for characterizing the structure and stoichiometry of native protein assemblies.
  • To overcome limitations of standard proteomics in analyzing complex, heterogeneous protein structures.

Main Methods:

  • Combined tandem affinity purification (TAP) for isolating native protein complexes with MS analysis of intact assemblies and subcomplexes.
  • Optimized protocol using Saccharomyces cerevisiae scavenger decapping and nuclear cap-binding complexes.

Related Experiment Videos

  • Applied method to the yeast exosome complex.

    • Main Results:

    • Determined subunit stoichiometry and identified substoichiometric binding in optimized complexes.
    • Generated a 3D interaction map of the ten-subunit yeast exosome by analyzing subcomplexes.
    • Demonstrated the method's utility for large, heterogeneous cellular complexes.

    Conclusions:

    • The combined TAP and MS approach provides detailed structural organization and stoichiometry of native protein complexes.
    • This methodology is effective for characterizing large, heterogeneous, and low-abundance protein assemblies.
    • Enables a deeper understanding of protein complex organization and function in vivo.