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Trehalose influence on beta-lactoglobulin stability and hydration by time resolved fluorescence
Laura D'Alfonso1, Maddalena Collini, Giancarlo Baldini
1Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, and Istituto Nazionale per la Fisica della Materia, Milano, Italy.
European Journal of Biochemistry
|May 21, 2003
Summary
Trehalose stabilizes beta-lactoglobulin (BLG) against chemical denaturation by increasing its free energy. This disaccharide also affects protein dynamics and solution properties, enhancing BLG stability.
Area of Science:
- Biochemistry
- Protein Chemistry
- Biophysical Chemistry
Background:
- Beta-lactoglobulin (BLG) is a major whey protein.
- Protein stability is crucial for its function and application.
- Chemical denaturation is a common method to study protein stability.
Purpose of the Study:
- To investigate the stabilizing effect of trehalose on BLG.
- To understand how trehalose influences BLG denaturation at different pH.
- To explore the impact of trehalose on BLG's internal dynamics and hydrodynamic properties.
Main Methods:
- Time-resolved fluorescence spectroscopy using acrylodan probe.
- Guanidinium chloride-induced chemical denaturation.
- Fluorescence anisotropy measurements.
- Analysis using a two-state denaturation model.
Main Results:
- Trehalose significantly increases the denaturation free energy of BLG by approximately 60%.
- The stabilizing effect is independent of trehalose concentration and pH.
- Trehalose addition increases the rigidity of the acrylodan environment, while guanidinium chloride decreases it.
- Trehalose influences the hydrodynamic properties of BLG in solution.
Conclusions:
- Trehalose acts as an effective stabilizer for BLG against chemical denaturation.
- Trehalose modulates protein dynamics and solution properties, contributing to enhanced stability.
- Further investigation into the mechanisms of trehalose-protein interactions is warranted.