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Regulated pole-to-pole oscillations of a bacterial gliding motility protein

Tâm Mignot1, John P Merlie, David R Zusman

  • 1University of California, Department of Molecular and Cell Biology, Berkeley, CA 94720-3204, USA.

Science (New York, N.Y.)
|November 8, 2005
PubMed

Insights

Myxococcus xanthus bacteria reverse direction using type IV pili. A protein called FrzS oscillates between cell poles, regulated by the Frz system, controlling directed motility.

Area of Science:

  • Microbiology
  • Bacterial Motility
  • Cell Biology

Background:

  • Directed bacterial motility is crucial for survival and colonization.
  • Type IV pili mediate twitching motility, a key mechanism for bacterial movement.
  • The regulation of cell polarity during directed motility remains poorly understood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying directed motility in Myxococcus xanthus.
  • To elucidate the role of the Frz chemosensory system in regulating cell polarity.
  • To understand the dynamics of proteins involved in directed motility.

Main Methods:

  • Live-cell imaging of Myxococcus xanthus.
  • Tracking of type IV pili dynamics during cell reversals.
  • Monitoring the subcellular localization and movement of the FrzS protein.

Main Results:

  • Type IV pili disassemble at one pole and reassemble at the opposite pole during cell reversals.
  • The protein FrzS exhibits oscillatory pole-to-pole migration synchronized with cell reversals.
  • The Frz chemosensory system controls the frequency of FrzS oscillations and directed motility.

Conclusions:

  • FrzS dynamics and pole-to-pole migration are critical for regulating cell polarity in Myxococcus xanthus.
  • The Frz chemosensory system acts as a master regulator of directed motility by controlling FrzS oscillations.
  • This study provides novel insights into the coordinated regulation of pili dynamics and protein localization for bacterial directed movement.

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