CD studies were performed in (i) water, (ii) in dodecylophosphocholine (DPC) micelles (5mM, 25 mM, 50mM and 100 mM, POCH, Poland) in water (pH 7.0) and (iii) in 1-palmitoyl-2oleoyl-sn-glycero-3-phosphatidylcholine (POPC) liposomes. The peptide solutions in the DPC micelles were prepared according to standard procedures . To prepare the POPC liposomes POPC lipids (Avanti Polar Lipids Inc., Alabaster, AL, USA) were weighted in an eppendorf vial and dissolved in a chloroform/methanol mixture (2:1 v/v). Then the organic solvent was evaporated using dry nitrogen gas creating the thin film. Lipid film samples were freeze-dried, the lipids were hydrated with water, and a suspension of multilamellar vesicles was obtained by shaking on a vortex mixer The peptide was added to the liposomes prepared in this way and then incubated for one hour.