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Identification of mannitol as compatible solute in Gluconobacter oxydans
Nageena Zahid1, Paul Schweiger, Erwin Galinski
1Institute of Microbiology and Biotechnology, Meckenheimer Allee 168, 53115, Bonn, Germany.
Applied Microbiology and Biotechnology
|May 16, 2015
Summary
Gluconobacter oxydans accumulates mannitol to protect itself from osmotic stress in sugar-rich environments. This finding is crucial for optimizing industrial processes using this bacterium.
Area of Science:
- Microbiology
- Biochemistry
Background:
- Gluconobacter oxydans is industrially significant for its selective oxidation capabilities.
- Understanding its adaptation to high-osmolarity sugar environments is crucial but remains unclear.
Purpose of the Study:
- Investigate the mechanisms of osmoprotection in Gluconobacter oxydans.
- Identify potential osmoprotectants in response to osmotic stress.
Main Methods:
- Grew G. oxydans in media with varying sucrose concentrations.
- Analyzed intracellular metabolites using HPLC and (13)C NMR spectroscopy.
- Assessed growth and metabolic activity with and without exogenous mannitol.
Main Results:
- Mannitol accumulation was identified as a key osmoprotectant, correlating with increased external osmolarity.
- Exogenous mannitol significantly alleviated sucrose-induced osmotic stress, restoring growth rates.
- Mannitol enhanced glucose consumption and gluconate formation.
Conclusions:
- Mannitol plays a vital role in G. oxydans osmoprotection.
- The addition of mannitol can optimize industrial fermentation processes in concentrated sugar solutions.
