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MinDE-dependent pole-to-pole oscillation of division inhibitor MinC in Escherichia coli

D M Raskin1, P A de Boer

  • 1Department of Molecular Biology, Case Western Reserve University, School of Medicine, Cleveland, Ohio 44106-4960, USA.

Journal of Bacteriology
|October 9, 1999
PubMed

Insights

The MinC protein, essential for bacterial cell division in Escherichia coli, oscillates dynamically. This oscillation, dependent on MinD and MinE proteins, ensures proper cell division by intermittently blocking FtsZ ring formation at cell ends.

Area of Science:

  • Cell biology
  • Microbiology
  • Molecular biology

Background:

  • The Min system regulates cell division placement in Escherichia coli.
  • MinC inhibits FtsZ ring formation, preventing division at cell poles.
  • MinD and MinE proteins modulate MinC activity and localization.

Purpose of the Study:

  • To investigate the dynamic localization of the MinC protein during cell division.
  • To elucidate the roles of MinD and MinE in MinC's dynamic behavior.
  • To test the dependence of MinC oscillation on FtsZ.

Main Methods:

  • Utilized functional green fluorescent protein-MinC (GFP-MinC) to visualize protein localization.
  • Observed MinC localization dynamics in live Escherichia coli cells.
  • Manipulated the expression or function of MinD and MinE proteins.

Main Results:

  • Functional GFP-MinC exhibited oscillatory localization patterns similar to MinD.
  • MinC's oscillatory behavior was dependent on the presence of both MinD and MinE proteins.
  • MinC oscillation was independent of FtsZ, the primary component of the division ring.

Conclusions:

  • MinD recruits MinC to its site of action, mediating its dynamic localization.
  • The oscillatory behavior of MinC, MinD, and MinE ensures intermittent inhibition of FtsZ ring assembly at cell poles.
  • This mechanism contributes to the precise positioning of the division septum during Escherichia coli cell division.

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