title: Effect of primycin on monovalent cation transport of erythrocyte membrane and lipid bilayer.
abstract: The effects of primycin were investigated on the alkali-cation transport of human erythrocytes and on the electric conduction of bimolecular lipid membranes. In the concentration range of 3.10(-6) approximately 10(-5) M primycin increased the permeability of erythrocytes to alkali-cations according to the sequences Cs+ greater than Rb+ approximately K+ greater than Na+, while the conductance of the negatively charged phosphatidylserine bimolecular lipid membrane increased by 2 approximately 3 orders of magnitude. The resistance-lowering effect of primycin strongly depended on the cationic species applied and a selectivity order Na+ greater than K+ greater than Rb+ greater than Cs+ was found. A possible mechanism of the primycin-membrane interaction is suggested on the basis of experimental data.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002412:Cations / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects; D004910:Erythrocyte Membrane / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D007783:Lactones / Q000494:pharmacology; D008055:Lipids; D008567:Membranes, Artificial; D013997:Time Factors
chemical_list: D000900:Anti-Bacterial Agents; D002412:Cations; D007783:Lactones; D008055:Lipids; D008567:Membranes, Artificial