title: 1,2-dotriacontanedioyl-sn-glycero-3-phosphocholine: A cyclic lipid used for phospholipase A2-catalyzed modulation of the liposome surface charge.
abstract: An aqueous suspension of liposomes, which were made of cyclic 1, 2-dotriacontanedioyl-sn-glycero-3-phosphocholine (dTPC) and 1, 2-diphytanyl-sn-glycero-3-phosphocholine, was incubatedwith phospholipase A2 (Naja mossambica mossambica) in 0.05 M Tris-HCl, pH 7.7-7.8. At 25 degrees C, approximately 30% of the cyclic lipids was digested into 1-(omega-carboxyhentriacontanoyl)-sn-glycero-3-phosphocholine (lyso-dTPC), the original morphology being preserved but with a decrease in the zeta-potential of the membrane from ca. +2 to -1 mv. At 38 degrees C in 30 min, as much as 45% of the cyclic lipids was attacked by the lipase, which resulted in lowering of the potential to -2.5 to -3 mV. The enzymatic surface-charge modulation was discussed in conjunction with a side-selective attack of the phospholipase on the lipid bilayer.
authors.affiliation: Department of Bioapplied Chemistry, Faculty of Engineering, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamauchi
authors.forename: M
authors.initials: M
authors.lastname: Hayashi
authors.forename: I
authors.initials: I
authors.lastname: Yamamoto
mesh_terms: D002384:Catalysis; D008081:Liposomes / Q000737:chemistry*; D008854:Microscopy, Electron; D010316:Particle Size; D010713:Phosphatidylcholines / Q000378:metabolism*; D010741:Phospholipases A / Q000378:metabolism*; D054467:Phospholipases A2; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D008081:Liposomes; D010713:Phosphatidylcholines; C047037:1,2-ditetradecylphosphatidylcholine; D010741:Phospholipases A; D054467:Phospholipases A2