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Lipid-vesicle-surface chromatography.

Q Yang1, M Wallstén, P Lundahl

  • 1Department of Biochemistry, University of Uppsala, Sweden.

Journal of Chromatography
|May 11, 1990
PubMed
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Lipid vesicles entrapped in agarose beads serve as a novel chromatography matrix for protein separation. This method effectively binds and separates proteins like ferritin and albumin, demonstrating potential for biomolecule purification.

Area of Science:

  • Biochemistry
  • Separation Science
  • Materials Science

Background:

  • Lipid vesicles (liposomes) offer unique surface properties for biomolecule interactions.
  • Entrapment in agarose gel beads provides a stable matrix for chromatographic applications.
  • Cationic and anionic vesicles can be formed for selective binding.

Purpose of the Study:

  • To develop and evaluate liposome-entrapped agarose beads as a stationary phase for protein chromatography.
  • To investigate the binding capacity and selectivity of ionic vesicles for various proteins.
  • To assess the stability and reusability of the liposome-agarose matrix.

Main Methods:

  • Formation of egg-yolk phospholipid vesicles with stearylamine (cationic) or phosphatidylserine (anionic).

Related Experiment Videos

  • Entrapment of vesicles within Sepharose 6B agarose beads via dialysis.
  • Chromatographic separation of proteins including ferritin, citraconylated myoglobin, bovine serum albumin (BSA), and ribonuclease A using the liposome-agarose column.

    • Main Results:

    • Cationic vesicle columns demonstrated significant binding of ferritin and BSA, with capacity dependent on protein size and vesicle surface charge.
    • Protein-vesicle interactions were modulated by ionic strength, allowing for elution and separation.
    • The liposome-agarose matrix showed good stability over multiple runs, though preferential loss of stearylamine was observed with BSA.
    • Separation of human plasma proteins and BSA monomers/dimers was achieved, outperforming DEAE-Sepharose for dimer separation.

    Conclusions:

    • Liposome-entrapped agarose beads represent a viable and stable stationary phase for ion-exchange chromatography.
    • The binding strength is influenced by the contact area between proteins and the vesicle surface.
    • This technique offers a promising approach for studying protein-vesicle interactions and for protein purification.