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Biosynthesis and function of trehalose in Ectothiorhodospira halochloris
K Lippert1, E A Galinski, H G Trüper
1Institut für Mikrobiologie & Biotechnologie, Universität Bonn, Germany.
Antonie Van Leeuwenhoek
|January 1, 1993
Summary
Trehalose 6-phosphate synthase from Ectothiorhodospira halochloris was purified and characterized. This enzyme functions optimally in high salt conditions, with glycine betaine offering protection against salt inhibition.
Area of Science:
- Biochemistry
- Microbiology
- Enzymology
Background:
- Trehalose 6-phosphate synthase (TPS) is crucial for trehalose synthesis.
- Ectothiorhodospira halochloris is a halo-alkaliphilic bacterium with unique metabolic adaptations.
Purpose of the Study:
- To isolate and partially purify TPS from Ectothiorhodospira halochloris.
- To characterize the enzyme's biochemical properties and response to environmental factors.
Main Methods:
- Enzyme isolation and partial purification (30-fold).
- Determination of enzyme kinetics, optima (pH, temperature, MgCl2), and molecular weight.
- Assessment of salinity dependence and protective effects of glycine betaine.
Main Results:
- The molecular weight of TPS was determined to be 63,000.
- Optimal conditions included pH 7.5, 50°C, and 3-6 mM MgCl2.
- The enzyme exhibited salinity dependence, with optimal activity between 100-300 mM salt, and glycine betaine protected against high salt concentrations.
Conclusions:
- TPS from E. halochloris is adapted to high-salinity environments.
- Glycine betaine acts as a compatible solute, mitigating salt stress on TPS activity.
- Understanding these properties aids in comprehending microbial adaptation to extreme conditions.