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Preincubation of Ehrlich ascites tumour cells with millimolar concentrations of pantothenic acid, pantothenol or pantethine, but not with homopantothenic acid, at 22°C or 32°C, but not at 0°C, makes the plasma membrane more resistant to the damaging effect of submillimoiar concentrations of digitonin. It is proposed that this increased resistance is due to the increased rate of cholesterol biosynthesis. In fact, incorporation of [14C]acetate into cholesterol is by 45% increased in the cells preincubated with pantothenic acid; this probably reflects elevation of the content of CoA in such cells [Slyshenkov, V.S., Rakowska, M., Moiseenok, A.G. & Wojtczak, L. (1995) Free Radical Biol. Med. 19,767-772].
Nitrate uptake in right-side out plasma membrane vesicles isolated from cucumber roots was characterized. Nitrate uptake into vesicles was driven by an artificially imposed pH gradient. The uptake was strongly inhibited by phenylglyoxal, an arginyl residue modificator. Only a slight repression of NO⁻₃ transport in vesicles was observed in the presence of NEM, a thiol group reagent. pCMBS, an other thiol reagent and DEPC, an effector of histidine residue, had no effect on the nitrate transport in plasma membranes. ATP-driven proton transport in vesicles was not significantly affected in the presence of both, phenylglyoxal and DEPC, whereas pCMBS and NEM abolished it almost completely. The possible role of the particular amino acids residues in the active nitrate transport is discussed. NO⁻₃ uptake into vesicles isolated from both, nitrate-induced and nitrate-depleted plant material was higher than that observed in the vesicles obtained from uninduced plants. Thus, isolated vesicles reflect the well-known in vivo response of intact plants on the exogenous nitrogen regime.
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