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Dennis A Bazylinski1, Christopher T Lefèvre2

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Magnetotactic bacteria (MTB) form magnetic crystals called magnetosomes to navigate Earth's geomagnetic field. Recent discoveries reveal thermophilic and alkaliphilic MTB thriving in extreme environments, expanding their known habitats.

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Area of Science:

  • Microbiology
  • Biomineralization
  • Geomagnetism

Background:

  • Magnetotactic bacteria (MTB) are motile prokaryotes that biomineralize magnetic crystals (magnetosomes).
  • Magnetosomes, composed of magnetite or greigite, enable cells to align with Earth's geomagnetic field (magnetotaxis).
  • MTB typically inhabit the oxic-anoxic interface (OAI) in aquatic environments, using magnetosomes for efficient chemotaxis.

Purpose of the Study:

  • To explore the phylogenetic diversity of magnetotactic bacteria.
  • To investigate the known environmental ranges and adaptations of MTB.
  • To document newly discovered thermophilic and alkaliphilic MTB strains and their habitats.

Main Methods:

  • Phylogenetic analysis of cultured and uncultured MTB.
  • Isolation and characterization of novel MTB strains.
  • Environmental sampling from diverse aquatic habitats, including hot springs and alkaline lakes.

Main Results:

  • MTB are phylogenetically diverse, associated with Proteobacteria, Nitrospirae, and PVC superphylum.
  • Previously, MTB were thought to be restricted to neutral pH and ambient temperatures.
  • Discovery of a moderately thermophilic MTB (up to 63°C) and obligately alkaliphilic MTB (pH >9.0) in Nevada and California.

Conclusions:

  • Magnetotactic bacteria inhabit a wider range of environmental conditions than previously known.
  • The discovery of thermophilic and alkaliphilic MTB expands our understanding of their ecological roles and adaptations.
  • MTB are more versatile and ubiquitous than previously assumed, found in extreme environments.