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Updated: Jul 2, 2026

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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Forced extraction of targeted components from complex macromolecular assemblies.

Sean D Moore1, Tania A Baker, Robert T Sauer

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 13, 2008
PubMed
Summary
This summary is machine-generated.

Researchers used AAA+ enzymes to remove essential ribosomal protein L22 from E. coli ribosomes. This method preserves complex integrity, enabling functional studies of removed proteins.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Studying protein function within macromolecular complexes is challenging when proteins are essential for assembly.
  • Removing essential components after assembly is difficult without compromising complex integrity.

Purpose of the Study:

  • To develop a method for removing essential protein components from macromolecular complexes.
  • To investigate the role of ribosomal protein L22 by removing it from the E. coli ribosome.

Main Methods:

  • Utilized an AAA+ unfoldase/protease (ClpXP) for protein extraction.
  • Depleted Mg(2+) to facilitate ClpXP-mediated removal of an ssrA-tagged ribosomal protein L22.
  • Analyzed the structural integrity and hydrodynamic properties of the resulting 50S ribosomal subunit.

Main Results:

  • Successfully extracted ribosomal protein L22 from the E. coli 50S ribosomal subunit using ClpXP.
  • The extraction process did not disrupt the structural integrity or hydrodynamic properties of the ribosome.
  • Demonstrated the feasibility of using AAA+ enzymes for targeted component removal.

Conclusions:

  • AAA+ enzyme-mediated forced extraction is a viable strategy for studying essential assembly proteins.
  • This technique can be broadly applied to investigate the roles of individual components in various macromolecular complexes.
  • Enables functional and structural analysis of proteins removed from their native complexes.