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Published on: November 30, 2018
κ-Casein inhibits amorphous aggregation of β-casein.
Jaspreet Kaur1, Mily Bhattacharya1
1Department of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147004, Punjab, India. mily.bhattacharya@thapar.edu.
Kappa-casein (κ-casein) acts as a molecular chaperone, preventing calcium-induced aggregation of beta-casein (β-casein). This discovery offers new strategies for controlling food protein assembly and disassembly during processing.
Area of Science:
- Food Science
- Biochemistry
- Protein Chemistry
Background:
- Caseins are vital milk proteins with nutritional and functional properties.
- Beta-casein (β-casein) functions as an emulsifier, foam stabilizer, and molecular chaperone.
- Protein aggregation during food processing alters functional properties, raising quality concerns.
Purpose of the Study:
- To investigate the chaperone-like activity of kappa-casein (κ-casein) in preventing beta-casein (β-casein) aggregation.
- To understand the mechanism by which κ-casein inhibits calcium ion-induced β-casein aggregation.
Main Methods:
- Turbidity assays
- Dynamic light scattering
- Electron microscopy
Main Results:
- κ-casein dose-dependently inhibited calcium ion-induced amorphous aggregation of β-casein.
- Formation of β- and κ-casein complexes prevented calcium ion binding to β-casein.
- κ-casein addition led to the disintegration of pre-formed β-casein aggregates.
Conclusions:
- κ-casein exhibits chaperone activity against β-casein aggregation.
- Complex formation between κ- and β-casein is key to inhibiting aggregation.
- Findings suggest potential strategies for regulating casein assembly and disassembly in food systems.
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