Polar head charge of membrane modifiers and their biological activity: the Monte Carlo simulation studies

• Autorzy: Kubica K.
• Języki publikacji: EN

Abstrakty

EN

On the basis of the 10-state Pink model, the effect of the polar head charge of amphiphilic modifier molecules has been discussed. It was shown, that for small concentrations of anionic and cationic compounds inserted into a layer composed of electroneutral lipids the electrostatic interaction, in spite of the long-range character, can be limited to the nearest neighbour interaction. Computer simulation results suggest, that the gel-fluid transition temperature can be lowered or raised by a proper selection of anionic-cationic amphiphilic modifiers. Moreover, the effect of ionic strength of the membrane medium and dielectric permeability of the hydrophobic part of membrane, where a shift of the dielectric constant from 5 to 80 occurred, has been studied. It was also shown that addition of alkyl molecules to the membrane, which are the counterions of alkyl modifier molecules added earlier, almost doubles the number of incorporated membrane modifiers. Membrane permeability analysis shows that membrane permeability, at temperatures lower than the gel-fluid transition temperature, should be more related to the number of small domains (cluster area) and less to the interfacial area.

Słowa kluczowe

EN

Monte Carlo simulation; membrane modifiers; phospholipids; Pink model; membrane; membrane simulations; gel fluid transition; polar head charge; biological activity

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 1998
• Tom: Vol. 2, No 4
• Strony: 601--609
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Kubica K.

• Department of Physics and Biophysics, Agricultural University, Norwida 25, 50-375 Wroclaw, Poland

Bibliografia

• [1] Ipsen J. H., Mouritsen O. G., Bloom M., Relationships between lipid membrane area, hydrophobic thickness, and acyl-chain orientational order, The effects of cholesterol. Biophys. J. 57:405-412 (1990)
• [2] Mouritsen O. G., Boothroyd A., Harris R., Jan N., Lookman T., MacDonald L., Pink D. A., Zuckermann M. J., Computer simulation of the main gel-fluid phase transition of lipid bilayers, J. Chem. Phys.79: 2027-2041 (1983)
• [3] Pink D. A., Green T. J., Chapman D., Raman Scattering in Bilayers of Saturated Phosphatidylcholines, Experiment and Theory. Biochemistry 19: 349-356 (1980)
• [4] Stankowski S., Surface charging by large multivalent molecules. Extending the standard Gouy-Chapman treatment, Biophys. J.60: 341-351 (1991)
• [5] Kubica K., The effect of amphiphilic counterions on the gel-fluid phase transition of the lipid bilayer, Appl. Math. Comp.87: 261-270 (1997)
• [6] Ipsen J., H., Jorgensen K., Mouritsen O. G., Density fluctuations in saturated phospholipid bilayers increase as the acyl-chain length decreases, Biophys. J. 58: 1099-1107(1990)
• [7] Mouritsen O. G., Jorgensen K., Ipsen J. H., Zuckermann M. J., Cruzeiro-Hansson L., Computer Simulation of Interfacial Fluctuation Phenomena, Physica Scripta T33: 42-51 (1990)
• [8] Kuczera J., Fogt A., Kubica K., Przestalski S., Witek S., Plucinski J., Effect of a surface active anions on the activity of dedecyloxymethylene-methylmarpholinium chlorides as modifier of sulphate ion transport across lecithin liposome membrane, Studia Biophysica 133: 209-220 (1989)
• [9] Sarapuk J., Kleszczynska H., Przestalski S., Kilian M., Biological activity of N-dodecyloxymethylene-N-methylmorpholinium chloride enhanced by sodium sulphonates, Tenside, Surfactants, Detergents 29: 349-351 (1992)
• [10] Jorgensen K„ Ipsen J. H., Mouritsen O. G. Bennett D., Zuckerman M. J.,A general model for the interaction offoreign molecules with lipid membranes: drugs and anaesthetics, BBA1062:227-238 (1991)
• [11] Jorgensen K., Ipsen J. H., Mouritsen O. G., Bennett D. and Zuckerman M. J., The effects of density fluctuations on the partitioning of foreign molecules into lipid bilayers: Application to anaesthetics and insecticides, BBA 1067: 241-253 (1991)
• [12] Kubica K., Pink's model and lipid membranes, Cellular and Molecular Biology Letters 2:257-263(1997)