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Related Experiment Videos

Redox-reactive membrane vesicles produced by Shewanella.

Y Gorby1, J McLean, A Korenevsky

  • 1J. Craig Venter Institute, La Jolla, CA 92037, USA. ygorby@jcvi.org

Geobiology
|May 24, 2008
PubMed
Summary
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Dissimilatory metal-reducing bacteria produce membrane vesicles that transform and precipitate heavy metals and radionuclides. These vesicles, potentially resembling nanofossils, may serve as biosignatures for extraterrestrial life.

Area of Science:

  • Microbiology
  • Biogeochemistry
  • Astrobiology

Background:

  • Dr. Terry Beveridge pioneered research in microbial ultrastructure, S-layers, and microbe-mineral interactions.
  • His work defined the structure and function of outer membrane vesicles in Gram-negative bacteria.
  • This study integrates research on microbial metal interactions and membrane vesicle functions.

Purpose of the Study:

  • To investigate the role of membrane vesicles from Shewanella in heavy metal and radionuclide transformation.
  • To explore the potential of mineralized vesicles as biosignatures for early life and extraterrestrial life.

Main Methods:

  • Utilized electron microscopy to study microbial ultrastructure and membrane vesicles.
  • Investigated the catalytic activity of membrane vesicles in metal precipitation.

Related Experiment Videos

  • Examined the association of membrane vesicles with bacterial nanowires under low-shear conditions.

    • Main Results:

    • Membrane vesicles from Shewanella catalyze the enzymatic transformation and precipitation of heavy metals and radionuclides.
    • Mineralized vesicles exhibit morphological similarities to nanofossils.
    • Membrane vesicles are tethered to cells by bacterial nanowires under low-shear conditions.

    Conclusions:

    • Microbial membrane vesicles play a significant role in biogeochemical cycling of metals.
    • Mineralized vesicles hold potential as indicators of past life on Earth and biosignatures for extraterrestrial life.
    • Further research is needed to elucidate the functional role of membrane vesicles and bacterial nanowires.