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Related Experiment Videos

Interfacial interactions between poly[L-lysine]-based branched polypeptides and phospholipid model membranes.

R Szabó1, F Hudecz, F Reig

  • 1Research Group Peptide Chemistry at Eötvös L. University, Hungarian Academy of Sciences, P.O. Box 32, H-1518 Budapest 112, Hungary.

Journal of Colloid and Interface Science
|October 14, 2003
PubMed
Summary

Five poly[L-lysine]-derived polypeptides interact with lipid bilayers, with amphoteric E(i)K showing the highest interaction. Polycationic polypeptides H(i)K and P(i)K insert into the bilayer core, suggesting potential as safe carriers for bioactive molecules.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Biophysics

Background:

  • Poly[L-lysine]-derived polypeptides are investigated for their potential applications.
  • Understanding their interaction with lipid bilayers is crucial for drug delivery systems.

Purpose of the Study:

  • To investigate the interaction of five poly[L-lysine]-derived branched chain polypeptides with neutral (DPPC) and mixed (DPPC/PG) lipid bilayers.
  • To evaluate the influence of polypeptide side chain properties on bilayer interactions.
  • To assess the potential of these polypeptides as safe carriers for bioactive molecules.

Main Methods:

  • Fluorescence polarization techniques were employed using DPH and TMA-DPH probes.
  • The probes monitored motion in the internal and polar head regions of lipid bilayers.

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  • Lipid transition temperatures were measured to assess bilayer perturbation.

    • Main Results:

    • Interaction strength with neutral bilayers depends on side chain polarity and charge; amphoteric E(i)K showed the highest interaction.
    • Polycationic polypeptides (H(i)K, P(i)K) significantly altered transition temperatures, indicating insertion into the hydrophobic core.
    • Polyanionic Succ-EAK had no effect on the alkyl chain region, and most polypeptides showed minimal interaction with the liposome surface.

    Conclusions:

    • Polypeptide interaction with lipid bilayers is primarily governed by side chain characteristics.
    • Polycationic polypeptides H(i)K and P(i)K insert into the hydrophobic core without destabilizing the liposome.
    • These polypeptides, excluding E(i)K, exhibit properties suitable for use as safe carriers for bioactive molecules.