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The switch I and II regions of MinD are required for binding and activating MinC

Huaijin Zhou1, Joe Lutkenhaus

  • 1Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, Kansas 66160, USA.

Journal of Bacteriology
|February 20, 2004
PubMed

Insights

MinD and MinC inhibit bacterial cell division by targeting the Z-ring. Mutations in MinD

Area of Science:

  • Bacterial cell division
  • Protein-protein interactions
  • Molecular mechanisms of cell cycle regulation

Background:

  • MinD and MinC form a complex that inhibits Z-ring formation, a crucial step in bacterial cell division.
  • MinE spatially regulates this inhibition, ensuring division occurs at the cell poles.
  • Understanding the MinD-MinC interaction is key to elucidating the regulation of bacterial cytokinesis.

Purpose of the Study:

  • To investigate the molecular mechanisms by which MinD activates MinC.
  • To identify specific regions of MinD involved in MinC interaction and activation.
  • To characterize the role of MinD's switch I and switch II regions in protein complex formation and function.

Main Methods:

  • Isolation and characterization of loss-of-function mutations in the minD gene.
  • Site-directed mutagenesis to probe specific regions of MinD.
  • Assays to evaluate MinD self-interaction, membrane binding, MinE stimulation, and MinC interaction.
  • Assessment of the MinCD complex's ability to target the septum and inhibit division.

Main Results:

  • Mutations affecting nucleotide interaction or protein folding broadly disrupted MinD function.
  • Mutations in the switch I and switch II regions of MinD specifically impaired MinD-MinC interaction without affecting MinD self-interaction, membrane binding, or MinE stimulation.
  • One mutation in the switch II region allowed septum targeting but failed to inhibit division, indicating a role in MinC activation.

Conclusions:

  • The switch I and II regions of MinD are essential for interaction with MinC, but not MinE.
  • The switch II region of MinD plays a critical role in the activation of MinC.
  • These findings provide detailed insights into the regulation of bacterial cell division by the Min system.

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