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Related Experiment Videos

MukE and MukF form two distinct high affinity complexes.

Melanie Gloyd1, Rodolfo Ghirlando, Lindsay A Matthews

  • 1Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.

The Journal of Biological Chemistry
|March 16, 2007
PubMed
Summary
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The MukBFE complex, crucial for bacterial chromosome segregation, involves MukE and MukF accessory proteins. This study reveals MukE forms dimers that bind MukF dimers, creating distinct 2:2 and 2:4 complexes essential for function.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • The MukBFE complex in Escherichia coli is vital for chromosome segregation and condensation.
  • MukB is a structural maintenance of chromosomes (SMC) protein, requiring accessory proteins MukE and MukF for function.
  • While SMCs are studied, accessory protein roles in complexes like MukBFE remain less understood.

Purpose of the Study:

  • To characterize the oligomeric states and interactions of MukE and MukF proteins.
  • To elucidate the stoichiometry and formation of the functional MukBFE complex.

Main Methods:

  • Size exclusion chromatography was employed to assess protein size and oligomeric states.
  • Analytical ultracentrifugation provided detailed information on complex formation and stoichiometry.

Related Experiment Videos

  • Binding affinities and dissociation constants (K(D)) were determined for MukE self-association.

    • Main Results:

    • MukE self-associates into dimers with a dissociation constant (K(D)) of 18 +/- 3 µM.
    • MukE dimers interact with MukF dimers to form two stable complexes with 2:2 and 2:4 (F:E) stoichiometries.
    • No intermediate complexes were detected, suggesting a direct equilibrium between the two observed states.

    Conclusions:

    • The formation of the functional MukBFE complex relies on the equilibrium between the 2:2 and 2:4 (F:E) complexes.
    • These findings provide insights into the molecular mechanisms of bacterial chromosome segregation mediated by SMC-like complexes.