Plant Physiol. Illumina
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Plant Physiology 70:206-210 (1982)
© 1982 American Society of Plant Biologists

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Articles

Regulation by Lipids of Plant Microsomal Enzymes

III. Phospholipid Dependence of the Cytidine-Diphospho-Choline Phosphotransferase of Potato Microsomes

Alain Jolliot, Anne-Marie Justin, Evelyne Bimont and Paul Mazliak

Laboratoire de Physiologie Cellulaire, ERA 323, Université Pierre et Marie Curie, 75230 Paris cédex 05, France

Cytidine-diphospho-choline diacyl-glycerol phosphorylcholine phosphotransferase activity was demonstrated in potato (Solanum tuberosum L.) microsomes and the incorporation of cytidine-diphospho[14C]choline into phosphatidylcholine was characterized by the time course of 14C incorporation and the effect of microsomal protein concentration on choline incorporation.

Potato microsomes were progressively delipidated by treatments (2 min at 0°C) with increasing amounts of phospholipase C from Bacillus cereus. A decrease in choline phosphotransferase activity was observed in parallel with the progressive hydrolysis of membrane phospholipids. A 70% (or more) phospholipid hydrolysis provoked the total inactivation of the enzyme.

Adding back exogenous phospholipids (in the form of liposomes) to phospholipase C-treated membranes restored the enzymic activity. Restoration could be obtained with egg yolk phospholipids as well as with potato phospholipids. Restoration was time dependent and completed after 10 minutes; restoration was also dependent on the quantity of liposomes added to lipid-depleted membranes: the best restorations were obtained with 1 to 2.5 milligrams of phospholipid per mg of microsomal protein; higher phospholipid to protein ratios were less efficient or inhibitory.

These results clearly demonstrate the phospholipid dependence of the cytidine-diphospho-choline phosphotransferase from potato microsomes.






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Copyright © 1982 by the American Society of Plant Biologists