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Related Concept Videos

Cryo-electron Microscopy01:28

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Enabling cryo-EM density interpretation from yeast native cell extracts by proteomics data and AlphaFold structures.

Christian Tüting1,2,3, Lisa Schmidt1,2, Ioannis Skalidis1,2

  • 1Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.

Proteomics
|April 4, 2023
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Summary

This study combines proteomics, cryo-electron microscopy (cryo-EM), and AI to identify protein complexes in yeast. The workflow successfully identified the fatty acid synthase complex in native cell extracts.

Keywords:
AI-guidedcomputational analysiscryo-EMhomogenatesprotein structure predictionstructural proteomics

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Proteins function in communities, and identifying these interactions is crucial.
  • Mass spectrometry (MS)-based proteomics and cryo-electron microscopy (cryo-EM) are key technologies for studying protein complexes.
  • Advances in data analysis, including machine learning, are needed for large biological datasets.

Purpose of the Study:

  • To develop and validate a workflow for identifying protein complexes in native cell extracts.
  • To combine proteomics, cryo-EM, and AI for structural and interaction analysis.
  • To identify specific protein communities and their interactions within Saccharomyces cerevisiae.

Main Methods:

  • Proteomics analysis of mass spectrometry (MS) data from yeast native cell extract.
  • Cryo-electron microscopy (cryo-EM) for structural visualization of biomolecules.
  • Integration of MS proteomics data with AlphaFold-predicted atomic models for density assignment.

Main Results:

  • Identification of protein communities and inter-protein interactions using proteomics.
  • Reconstruction of a biomolecular complex at medium resolution (∼8 Å) via cryo-EM.
  • Assignment of the cryo-EM density to the 2.6 MDa complex of yeast fatty acid synthase using integrated data.

Conclusions:

  • The combined approach of proteomics, cryo-EM, and AI-guided structure prediction is effective for identifying protein complexes in native cell extracts.
  • This workflow enables the characterization of protein communities and interactions in complex biological samples.
  • The study successfully identified the yeast fatty acid synthase complex, demonstrating the utility of the integrated methodology.