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Vitamin K1 binding protein in milk
B Fournier1, M Leclercq, C Audigier-Petit
1CERNIP, Institut Pasteur, Lyon, France.
Summary
Cow's milk contains a protein complex that reversibly binds vitamin K1. This specific binding interaction was confirmed using the celite method, indicating a significant molecular weight for the complex.
Area of Science:
- Biochemistry
- Food Science
Background:
- Cow's milk is a dietary source of vitamin K.
- The presence and properties of vitamin K-binding proteins in milk are not fully characterized.
Purpose of the Study:
- To investigate the binding characteristics of a protein complex in cow's milk with vitamin K1.
- To determine the specificity and molecular weight of this vitamin K1-binding protein complex.
Main Methods:
- Utilized the celite method to establish a dynamic equilibrium for binding studies.
- Employed competition experiments to assess binding specificity.
- Estimated the molecular weight of the protein complex.
Main Results:
- Identified a protein complex in cow's milk capable of reversible vitamin K1 binding.
- Demonstrated the specificity of this binding interaction.
- Determined the molecular weight of the complex to be ≥ 7.5 x 10^2 kD.
Conclusions:
- Cow's milk possesses a specific protein complex that binds vitamin K1.
- The celite method is effective for studying such ligand-protein interactions.
- The characterized complex has a substantial molecular weight, suggesting its potential role in vitamin K transport or stability in milk.