title: Synthesis and intermembrane transfer of pyrene-labelled liponucleotides: ceramide phosphothymidines.
abstract: Phospholipid conjugates of 3'-azido-3'-deoxythymidine (AZT) show activity against human immunodeficiency virus (HIV) in vitro. Here we report on the synthesis and characterization of two pyrene containing conjugates: 2-N-(4-(pyren-1-yl)butanoyl)ceramide 5'-phosphothymidine (Pbs-Cer-P-T) (XII) and 2-N-(10-(pyren-1-yl)decanoyl)ceramide 5'-phosphothymidine (Pds-Cer-P-T) (XIII). These fluorescent labelled conjugates served as model compounds to study incorporation of sphingoliponucleotides into membranes. The complex compounds were prepared by condensation of 3'-acetylthymidine and labelled ceramides using the phosphite triester coupling procedure. UV absorption, fluorimetry as well as 1H-, 31P-, 13C-NMR analyses were used for structure confirmation of the synthesized substances. When incorporated into small unilamellar 1-palmitoyl-2-oleoyl-glycerophosphatidyl-choline (POPC) vesicles and incubated with unlabelled acceptor POPC vesicles, the compounds (XII) and (XIII) exhibited spontaneous transfer. Kinetic data suggest that transfer from donor to acceptor vesicles occurred via the intervening aqueous phase. The non-specific lipid transfer protein from bovine liver stimulated the transfer of Pds-Cer-P-T between phospholipid vesicles in a concentration dependent manner.
authors.affiliation: Department of Biotechnology, Moscow Lomonosov State Academy of Fine Chemical Technology, Russia.
authors.forename: O V
authors.initials: OV
authors.lastname: Oskolkova
authors.forename: V I
authors.initials: VI
authors.lastname: Shvets
authors.forename: A
authors.initials: A
authors.lastname: Hermetter
authors.forename: F
authors.initials: F
authors.lastname: Paltauf
mesh_terms: D000818:Animals; D001693:Biological Transport, Active; D002352:Carrier Proteins / Q000378:metabolism; D002417:Cattle; D002518:Ceramides / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D007700:Kinetics; D008081:Liposomes; D009682:Magnetic Resonance Spectroscopy; D009711:Nucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism*; D010743:Phospholipids / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism; D011721:Pyrenes / Q000737:chemistry; D013053:Spectrophotometry; D015215:Zidovudine / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D002518:Ceramides; C511922:GLTP protein, human; D008081:Liposomes; D009711:Nucleotides; D010743:Phospholipids; D011721:Pyrenes; C030363:lipid transfer protein; D015215:Zidovudine; C030984:pyrene