title: Effect of spermine on association of protein kinase C with phospholipid vesicles.
abstract: The in vitro mechanism by which polyamines affect protein kinase C (PK C) activation process was investigated in a reconstituted system consisting of purified enzyme and phospholipid vesicles of various phosphatidylserine content. It was found that the addition of spermine greatly interferes with the association of PK C to liposomes. This tetramine, at micromolar concentrations, was most potently effective while other polyamines such as spermidine and putrescine were almost ineffective; therefore the modulatory action appeared to be structure specific. The spermine effect is dramatically influenced by the density of the phosphatidylserine present on the liposome, suggesting the complex formation with the acidic component on phospholipid vesicles to be the mechanism by which this polyamine exerts its modulatory action.
authors: Istituto di Chimica Biologica, Università di Modena, Italy.
authors: M S
authors: MS
authors: Moruzzi
authors: M G
authors: MG
authors: Monti
authors: G
authors: G
authors: Piccinini
authors: G
authors: G
authors: Marverti
authors: B
authors: B
authors: Tadolini
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology; D007700:Kinetics; D008081:Liposomes / Q000378:metabolism*; D015240:Phorbol 12,13-Dibutyrate / Q000378:metabolism; D010713:Phosphatidylcholines / Q000378:metabolism; D010718:Phosphatidylserines / Q000378:metabolism; D011485:Protein Binding; D011493:Protein Kinase C / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013096:Spermine / Q000494:pharmacology*
chemical_list: D008081:Liposomes; D010713:Phosphatidylcholines; D010718:Phosphatidylserines; D013096:Spermine; D015240:Phorbol 12,13-Dibutyrate; D011493:Protein Kinase C