title: Head group specificity of phospholipase D isoenzymes from poppy seedlings (Papaver somniferum L.).
abstract: The biocatalytical potential of two new phospholipase D (PLD) isoenzymes from poppy seedlings (Papaver somniferum L.), PLD-A and PLD-B, was examined by comparing their activities in phospholipid transformation. Both enzymes showed the same ratio in rates of hydrolysis [phosphatidylcholine (PC):phosphatidylglycerol (PG):phosphatidylserine:phosphatidylinositol = 1:0.5:0.3:0.1] and were inactive towards phosphatidylethanolamine (PE). PLD-A did not catalyze head group exchange whereas PLD-B showed a high transphosphatidylation potential in the conversion of PC into PG and PE. This enzyme also catalyzed the transesterification of octadecylphosphocholine into octadecylphosphoglycerol or octadecylphosphoethanolamine.
authors.affiliation: Department of Cell and Molecular Biology of Drugs, Faculty of Pharmacy, Comenius University, Kalinciakova 8, SK-83232 Bratislava, Slovakia.
authors.forename: M
authors.initials: M
authors.lastname: Oblozinsky
authors.forename: R
authors.initials: R
authors.lastname: Ulbrich-Hofmann
authors.forename: L
authors.initials: L
authors.lastname: Bezakova
mesh_terms: D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007527:Isoenzymes / Q000737:chemistry / Q000378:metabolism; D015394:Molecular Structure; D010207:Papaver / Q000201:enzymology*; D010713:Phosphatidylcholines / Q000378:metabolism; D010715:Phosphatidylglycerols / Q000378:metabolism; D010716:Phosphatidylinositols / Q000378:metabolism; D010718:Phosphatidylserines / Q000378:metabolism; D010739:Phospholipase D / Q000737:chemistry / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism; D036226:Seedlings / Q000201:enzymology; D013379:Substrate Specificity
chemical_list: D007527:Isoenzymes; D010713:Phosphatidylcholines; D010715:Phosphatidylglycerols; D010716:Phosphatidylinositols; D010718:Phosphatidylserines; D010743:Phospholipids; D010739:Phospholipase D