title: Interaction of spermine with dimyristoyl-L-alpha-phosphatidyl-DL-glycerol multilamellar liposomes.
abstract: Polycationic spermine interacts with the negative phosphate group of dimyristoylphosphatidylglycerol multilamellar liposomes, forming a positively charged shell around the vesicle surface. An association constant of (2.15+/-0.45) x 10(3) M(-1) between spermine and the phospholipid groups in liposomes has been evaluated by a new and rapid enzymatic method. ESR spectra show that the effects of this polycation on liposomes are substantially different from those of cations like Ca2+ and Mg2+ and confirm the ability of spermine to induce liposome aggregation and not fusion.
authors.affiliation: INFM, Department of Physical Chemistry, University of Venice, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Stevanato
authors.forename: A
authors.initials: A
authors.lastname: Wisniewska
authors.forename: F
authors.initials: F
authors.lastname: Momo
mesh_terms: D002118:Calcium / Q000378:metabolism; D002412:Cations / Q000737:chemistry / Q000378:metabolism; D003497:Cyclic N-Oxides / Q000378:metabolism; D004578:Electron Spin Resonance Spectroscopy; D006863:Hydrogen-Ion Concentration; D008081:Liposomes / Q000737:chemistry / Q000378:metabolism*; D008274:Magnesium / Q000378:metabolism; D008968:Molecular Conformation; D010715:Phosphatidylglycerols / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism; D013096:Spermine / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D002412:Cations; D003497:Cyclic N-Oxides; D008081:Liposomes; D010715:Phosphatidylglycerols; D013096:Spermine; C032363:16-nitroxystearic acid; D012964:Sodium; C002773:dimyristoylphosphatidylglycerol; D008274:Magnesium; D002118:Calcium