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Casein interactions studied by the surface plasmon resonance technique.

S Marchesseau1, J C Mani, P Martineau

  • 1Laboratoire de Génie Biologique et Sciences des Aliments, Université Montpellier II, 34095 Montpellier Cedex 5, France.

Journal of Dairy Science
|December 19, 2002
PubMed
Summary

Surface plasmon resonance revealed casein association properties. Factors like pH, ionic strength, and calcium influence casein interactions, with calcium bridging phosphorylated caseins.

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Area of Science:

  • Biochemistry
  • Colloid Science
  • Protein Chemistry

Background:

  • Bovine caseins are crucial milk proteins involved in nutrient transport and micelle formation.
  • Understanding casein interactions is key to dairy product development and functionality.

Purpose of the Study:

  • To investigate the apparent hydrophobicity and association properties of major bovine caseins.
  • To quantify casein-casein interactions using surface plasmon resonance (SPR).

Main Methods:

  • Utilized SPR to measure casein binding to hydrophobic sensor chips for hydrophobicity assessment.
  • Employed SPR with covalently immobilized caseins to determine kinetic and equilibrium affinity constants for various casein pairs.
  • Investigated interactions under varying pH, ionic strength, calcium concentration, and chemical modification.

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Main Results:

  • Apparent hydrophobicities of alpha(s)-, beta-, and kappa-caseins were determined.
  • SPR quantified interactions including alpha(s)/alpha(s), alpha(s)/beta, alpha(s)/kappa, beta/beta, and beta/kappa.
  • Increased ionic strength enhanced casein interactions at neutral pH, suggesting electrostatic forces.
  • Reduced charge repulsions (acidification, dephosphorylation) strengthened interactions, indicating attractive forces.
  • Calcium addition significantly increased binding between phosphorylated caseins, participating in bridging.

Conclusions:

  • SPR is a valuable tool for studying casein hydrophobicity and association.
  • Electrostatic and attractive forces, modulated by pH and ionic strength, govern casein interactions.
  • Calcium ions play a direct role in mediating interactions between phosphorylated caseins, crucial for micelle formation.