linoleic-acid and 1-palmitoyl-2-oleoylphosphatidylcholine

linoleic-acid has been researched along with 1-palmitoyl-2-oleoylphosphatidylcholine* in 2 studies

Other Studies

2 other study(ies) available for linoleic-acid and 1-palmitoyl-2-oleoylphosphatidylcholine

ArticleYear
Identification of a secretory phospholipase A2 from Papaver somniferum L. that transforms membrane phospholipids.
    Phytochemistry, 2016, Volume: 129

    The full-length sequence of a new secretory phospholipase A2 was identified in opium poppy seedlings (Papaver somniferum L.). The cDNA of poppy phospholipase A2, denoted as pspla2, encodes a protein of 159 amino acids with a 31 amino acid long signal peptide at the N-terminus. PsPLA2 contains a PLA2 signature domain (PA2c), including the Ca(2+)-binding loop (YGKYCGxxxxGC) and the catalytic site motif (DACCxxHDxC) with the conserved catalytic histidine and the calcium-coordinating aspartate residues. The aspartate of the His/Asp dyad playing an important role in animal sPLA2 catalysis is substituted by a serine residue. Furthermore, the PsPLA2 sequence contains 12 conserved cysteine residues to form 6 structural disulfide bonds. The calculated molecular weight of the mature PsPLA2 is 14.0 kDa. Based on the primary structure PsPLA2 belongs to the XIB group of PLA2s. Untagged recombinant PsPLA2 obtained by expression in Escherichia coli, renaturation from inclusion bodies and purification by cation-exchange chromatography was characterized in vitro. The pH optimum for activity of PsPLA2 was found to be pH 7, when using mixed micelles of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and Triton X-100. PsPLA2 specifically cleaves fatty acids from the sn-2 position of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine and shows a pronounced preference for PC over phosphatidyl ethanolamine, -glycerol and -inositol. The active recombinant enzyme was tested in vitro against natural phospholipids isolated from poppy plants and preferably released the unsaturated fatty acids, linoleic acid and linolenic acid, from the naturally occurring mixture of substrate lipids.

    Topics: alpha-Linolenic Acid; Amino Acid Sequence; Escherichia coli; Hydrogen-Ion Concentration; Linoleic Acid; Molecular Structure; Molecular Weight; Papaver; Phosphatidylcholines; Phospholipases A2, Secretory; Phospholipids; Sequence Analysis, Protein

2016
The action of hypochlorous acid on phosphatidylcholine liposomes in dependence on the content of double bonds. Stoichiometry and NMR analysis.
    Chemistry and physics of lipids, 1995, Oct-22, Volume: 78, Issue:1

    Kinetics of the consumption of hypochlorous acid in its reaction with double bonds of unsaturated phospholipids and fatty acids were measured using luminol chemiluminescence. Stoichiometry ratios between the consumption of HOCl/OCl- and the loss of double bonds vary from 2:1 to 1:1. Highest values were found in DMPC liposomes containing 5 mol% oleic acid or OPPC. With increasing content of double bonds or higher numbers of double bonds in a fatty acid acyl chain due to incorporated unsaturated fatty acids or phospholipids in DMPC liposomes the stoichiometry ratio falls continuously to 1:1. A ratio of about 1:1 was observed in multilamellar and unilamellar liposomes composed of egg yolk phosphatidylcholine. Products of the reaction of oleic acid with hypochlorous acid were analyses by 1H-NMR spectroscopy. Chlorohydrins were formed in both DMPC liposomes containing 5 or 40 mol% oleic acid.

    Topics: Chemical Phenomena; Chemistry, Physical; Dimyristoylphosphatidylcholine; Hypochlorous Acid; Linoleic Acid; Linoleic Acids; Liposomes; Luminescent Measurements; Magnetic Resonance Spectroscopy; Oleic Acid; Oleic Acids; Phosphatidylcholines

1995