Abstract
Langmuir monolayers of amphotericin B (AmB) were investigated by recording π–A isotherms under different pH conditions. To gain a better insight into antibiotic–membrane interactions they were monitored by use of the ATR-FTIR spectroscopy. It was observed for AmB monolayers that the limiting molecular area was larger at high than at neutral pH. Analysis of FTIR spectra at different pH revealed substantial differences, depending on ionic state, for different orientations of AmB molecules. These results enable better understanding of the participation of functional groups in the interactions between AmB and sterol-containing DPPC membranes. AmB molecules incorporated into two-component lipid monolayers bind strongly to the ergosterol-rich membrane (maximum penetration surface pressures ca 35 mN/m). The FTIR spectra revealed that the ionic state of AmB and the presence of sterols led to changes in membrane fluidity and molecular packing of the AmB molecules in the lipid membranes. These investigations should be further investigated to discover the molecular mechanism responsible for the mode of action AmB in biological systems.
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This research was financed by the Ministry of Education and Science of Poland from the budget funds for science in the years 2008–2011 within the research project N N401 015035.
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Gagoś, M., Arczewska, M. FTIR spectroscopic study of molecular organization of the antibiotic amphotericin B in aqueous solution and in DPPC lipid monolayers containing the sterols cholesterol and ergosterol. Eur Biophys J 41, 663–673 (2012). https://doi.org/10.1007/s00249-012-0842-4
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DOI: https://doi.org/10.1007/s00249-012-0842-4