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Secondary metabolism in simulated microgravity.

A L Demain1, A Fang

  • 1Biology Department, Massachusetts Institute of Technology, Cambridge, USA. demain@mit.edu

Chemical Record (New York, N.Y.)
|March 15, 2002
PubMed
Summary
This summary is machine-generated.

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Microbial secondary metabolism was studied in simulated microgravity (SMG) using rotating-wall bioreactors (RWBs). While some product formations were inhibited by SMG, shear stress, not gravity, influenced carbon source repression and product localization.

Area of Science:

  • Microbiology and Biotechnology
  • Space Biology and Astrobiology
  • Biochemical Engineering

Background:

  • Microbial secondary metabolism is crucial for producing valuable compounds like antibiotics and immunosuppressants.
  • Simulated microgravity (SMG) environments, such as those provided by NASA's rotating-wall bioreactors (RWBs), offer unique conditions for studying cellular processes.
  • Understanding how microgravity affects microbial product formation is essential for potential space-based biomanufacturing and for fundamental biological insights.

Purpose of the Study:

  • To investigate the impact of simulated microgravity (SMG) on the secondary metabolism of various microorganisms.
  • To differentiate the effects of microgravity from other environmental factors like shear stress and vessel geometry.
  • To explore strategies for optimizing microbial product yields in microgravity conditions.
Keywords:
NASA Discipline Cell BiologyNon-NASA Center

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Main Methods:

  • Cultivation of Bacillus brevis, Streptomyces clavuligerus, Streptomyces hygroscopicus, and Escherichia coli in NASA RWBs under SMG and normal gravity (NG) conditions.
  • Comparison of product formation (gramicidin S, beta-lactam antibiotics, rapamycin, microcin B17) between SMG and NG.
  • Manipulation of environmental factors, including shear stress (via Teflon beads) and chemical stressors (ethanol), to assess their influence on growth and production.

Main Results:

  • SMG inhibited the production of beta-lactam antibiotics, rapamycin, and microcin B17, while gramicidin S production remained unaffected.
  • Carbon source repression effects (glycerol for GS, glucose for MccB17) were not observed in RWBs, suggesting gravity is not the primary factor.
  • Shear stress, not gravity, influenced product localization (e.g., microcin B17, rapamycin) and improved MccB17 production in SMG when enhanced by Teflon beads.

Conclusions:

  • Microbial secondary metabolism is differentially affected by simulated microgravity, with inhibition observed for several key products.
  • Shear stress and vessel geometry play a more significant role than gravity in modulating carbon source repression and product localization.
  • Optimizing shear stress in microgravity bioreactors presents a potential strategy to enhance the production of certain microbial metabolites.