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MinD proteins regulate CetZ1 localization in Haloferax volcanii.

Hannah J Brown1, Iain G Duggin1

  • 1Australian Institute for Microbiology and Infection, University of Technology Sydney, Ultimo, NSW, Australia.

Frontiers in Microbiology
|December 9, 2024
PubMed
Summary

MinD2 and MinD4 proteins in *Haloferax volcanii* control the positioning of CetZ1, an archaeal tubulin homolog. This positioning is crucial for cell shape, motility, and the localization of key motility proteins.

Keywords:
archaeacytoskeletonhalophilemotilityprotein localizationtubulin superfamily

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Area of Science:

  • Archaea biology
  • Cellular and Molecular Biology
  • Microbiology

Background:

  • CetZ proteins are archaea-specific homologs of bacterial FtsZ and eukaryotic tubulin, playing roles in cell shape and motility.
  • In *Haloferax volcanii*, CetZ1 localizes to the midcell, along the cell axis, and at cell poles, influencing archaellum and chemotaxis protein assembly.
  • MinD proteins, known for bacterial cell division, are involved in positioning motility proteins in archaea.

Purpose of the Study:

  • To investigate the role of the second archaeal MinD homolog, MinD2, in regulating CetZ1 localization and cell motility in *Haloferax volcanii*.
  • To understand the distinct and combined roles of MinD2 and MinD4 in positioning CetZ1 and its impact on archaeal motility.

Main Methods:

  • Utilized *minD* mutant strains (*minD2* knockout) in *Haloferax volcanii*.
  • Employed fluorescent CetZ1-mTq2 fusion protein for subcellular localization studies.
  • Compared localization patterns and motility in wild-type, *minD2*, *minD4*, and *minD2/4* mutant strains.

Main Results:

  • MinD2 knockout significantly altered CetZ1 distribution, affecting midcell and polar localization, and inhibiting polar targeting of CetZ1.
  • MinD4 showed a similar but less pronounced effect on motility and CetZ1 localization compared to MinD2.
  • MinD2 and MinD4 proteins collectively influence CetZ1 positioning, impacting cell motility and the localization of motility-related proteins at cell poles.

Conclusions:

  • MinD2 and MinD4 proteins play critical, distinct roles in positioning the archaeal tubulin homolog CetZ1.
  • The MinD-mediated positioning of CetZ1 is essential for cell shape maintenance and the development of swimming motility.
  • This study reveals the first instance of MinD proteins controlling the localization of tubulin superfamily proteins in archaea.