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A plant protein kinase and plant microsomal H(+) transport are stimulated by the ether phospholipid platelet-activating factor



A plant protein kinase and plant microsomal H(+) transport are stimulated by the ether phospholipid platelet-activating factor



Plant Cell Reports 7(7): 579-582



ATP-dependent H(+) transport in microsomes from zucchini hypocotyls is stimulated by the ether lipid 1-0-alkyl-2-acetyl-sn-glycero-3-phosphocholine (platelet-activating factor = PAF) known as a hormone-like substance from mammals. The stimulation can only be observed when soluble cytosolic proteins are present. A soluble protein mediating the PAF-dependent H(+) transport and a PAF-stimulated protein kinase are coeluted by DEAE-Sephacel chromatography. Stimulation of phosphorylation by PAF of a 55 kDa polypeptide without Ca(2+) and, additionally, of a 35 kDa polypeptide in the presence of Ca(2+) is observed in zucchini microsomal membranes. This is evidence for a novel phospholipid-stimulated protein kinase in plants. Phosphorylation of regulatory proteins may be involved in the stimulation of in vitro H(+) transport by PAF.

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Accession: 001740658

Download citation: RISBibTeXText

PMID: 24240422

DOI: 10.1007/bf00272762


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