Abstract
1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine, an ether phospholipid from mammals known as platelet-activating factor (PAF), specifically stimulates proton transport in zucchini (Cucurbita pepo L.) microsomes (G.F.E. Scherer, 1985, Biochem. Biophys. Res. Commm. 133, 1160–1167). When plant lipids were analyzed by two-dimensional thin-layer chromatography a lipid was found with chromatographic properties very similar to the PAF (G.F.E. Scherer and B. Stoffel, 1987, Planta, 172, 127–130). This lipid was isolated from zucchini hypocotyls, red beet root, lupin root, maize seedlings and crude soybean phospholipids. It had biological activity similar to that of the PAF, based on phosphorus content, and stimulated the steady-state ΔpH in zucchini hypocotyl microsomes about twofold. Other phospholipids, monoglyceride, diglyceride, triglyceride, oleic acid, phorbol ester, and 1-O-alkylglycerol did not stimulate proton transport. When microsomes were washed the PAF was ineffective but when soluble protein was added the PAF stimulation of H+ transport was reconstituted. The soluble protein responsible for the PAF-dependent stimulation of transport activity could be partially purified by diethylaminoethyl Sephacel column chromatography. In the same fractions where the PAF-dependent transport-stimulatory protien was found, a protein kinase was active. This protein kinase was stimulated twofold either by the PAF or by Ca2+. When Ca2+ was present the PAF did not stimulate protein-kinase activity. When either the PAF, protein kinase, or both were added to membranes isolated on a linear sucrose gradient, ATPase activity was stimulated up to 30%. Comparison with marker enzymes indicated the possibility that tonoplast and plasma-membrane H+-ATPase might be stimulated by the PAF and protein kinase. We speculate that a PAF-dependent protein kinase is involved in the regulation of proton transport in plants in vitro and in vivo.
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Abbreviations
- BTP:
-
1,3-bis[tris(hydroxymethyl)-methylamino] propane
- DEAE:
-
diethylaminoethyl
- EGTA:
-
ethylene glycolbis(β-aminoethyl ether)-N,N,N′,N′,-tetraacetic acid
- Mes:
-
2-(N-morpholino)ethanesulfonic acid
- PAF:
-
platelet-activating
- factor:
-
1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine
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Scherer, G.F.E., Martiny-Baron, G. & Stoffel, B. A new set of regulatory molecules in plants: A plant phospholipid similar to platelet-activating factor stimulates protein kinase and proton-translocating ATPase in membrane vesicles. Planta 175, 241–253 (1988). https://doi.org/10.1007/BF00392434
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DOI: https://doi.org/10.1007/BF00392434