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In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
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Published on: July 28, 2018

Spatial regulators for bacterial cell division self-organize into surface waves in vitro.

Martin Loose1, Elisabeth Fischer-Friedrich, Jonas Ries

  • 1Biotechnologisches Zentrum der Technischen Universität Dresden, Tatzberg 47-51, 01307 Dresden, Germany.

Science (New York, N.Y.)
|May 10, 2008
PubMed
Summary

Min proteins in Escherichia coli self-organize into dynamic surface waves on membranes. This self-organization requires adenosine 5'-triphosphate (ATP) and explains bacterial cell division site selection.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Min proteins in Escherichia coli regulate cell division by oscillating between poles.
  • Self-organization and reaction-diffusion mechanisms are proposed for Min protein dynamics.
  • Understanding these patterns is crucial for bacterial morphogenesis.

Purpose of the Study:

  • To investigate the self-organization of Min proteins in vitro.
  • To develop a model explaining Min protein pattern formation and in vivo oscillations.
  • To elucidate the role of adenosine 5 '-triphosphate (ATP) in Min protein dynamics.

Main Methods:

  • In vitro reconstitution of Min protein system on a flat membrane.
  • Observation of spontaneous pattern formation using microscopy.
  • Development and simulation of a reaction-diffusion model for MinD and MinE dynamics.

Main Results:

  • Min proteins spontaneously formed stable, planar surface waves on a flat membrane in vitro.
  • These patterns extended for hundreds of micrometers and persisted for hours.
  • Adenosine 5 '-triphosphate (ATP) was essential for pattern formation and maintenance.

Conclusions:

  • The Min protein system exhibits self-organization capabilities in vitro, forming large-scale dynamic patterns.
  • A reaction-diffusion model successfully replicates experimental observations and in vivo oscillations.
  • ATP-dependent self-organization of Min proteins provides a mechanism for bacterial cell division site selection.