Regulation of Transplasmalemma Electron Transport in Oat Mesophyll Cells by Sphingoid Bases and Blue Light

Autor:	Bernard Rubinstein, Arthur I. Stern, Suranganee Dharmawardhane
Rok vydání:	1989
Předmět:	Physiology DCMU Plant Science Dimethylurea Biology Photosynthesis Electron transport chain Redox chemistry.chemical_compound Electron transfer chemistry Biochemistry Genetics Protein phosphorylation Ferricyanide Membranes and Bioenergetics
Zdroj:	Plant Physiology. 89:1345-1350
ISSN:	1532-2548 0032-0889
DOI:	10.1104/pp.89.4.1345
Popis:	Long-chain sphingoid bases inhibit transplasmalemma electron transport in certain animal cells in part by inhibiting protein phosphorylation. As a first step in determining whether similar regulatory processes exist for cell surface redox activity in plants, peeled leaf segments of Avena sativa L. cv Garry were exposed to sphingoid bases and other long chain lipids. Sphingoid bases which are the most active inhibitors of protein kinase C in animal cells inhibit transplasmalemma electron transport by mesophyll cells in the dark as measured by reduction of exogenous ferricyanide. In white light, however, the same compounds markedly stimulate redox activity. The stimulation by sphingoid bases in the light is not eliminated by the inhibitor of photosynthesis, 3-(3,4-dichlorophenyl)-1,1 dimethylurea (DCMU). Redox activity remaining in the presence of DCMU and sphingoid bases can be observed in blue but not red light. A tentative hypothesis considering the involvement of two separate redox systems is presented in an attempt of explain the disparate action of sphingoid bases on electron transport across the plasmalemma.
Databáze:	OpenAIRE
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