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- W1514570914 abstract "The putative H+/Cl- symporter cycloprodigiosin-HCl (cPrG-HCl) was used to investigate the role of vacuole acidification in cereal aleurone cell function. The protein storage vacuole (PSV) becomes acidified rapidly when aleurone cells are treated with gibberellic acid (GA) but not abscisic acid (ABA). We show that cPrG prevents PSV acidification in aleurone layers and prevents synthesis of secretory proteins such as alpha-amylase. Our data support the hypothesis that decreased hydrolase synthesis is a consequence of decreased hydrolysis of storage proteins in PSV. Support for this hypothesis comes from experiments showing that breakdown of barley 7S globulins and phytate is inhibited by cPrG in GA-treated aleurone layers. Decreased mobilization of PSV reserves is accompanied by reductions in the free amino acid pool size and in the amount of ions released from the aleurone layer. Vacuolation of the aleurone cell is a diagnostic feature of the response to GA, and vacuolation is also inhibited by cPrG. Evidence that cPrG acts as a potential H+/Cl- symporter in aleurone is presented. We show that cPrG does not inhibit the synthesis and secretion of alpha-amylase when Cl- ions are omitted from the incubation medium. Although cPrG blocks many GA-induced responses of aleurone layers, it does not affect early steps in GA signaling. The SLN1 protein, a negative regulator of GA signaling, is turned over in GA-treated cells in the presence and absence of cPrG. Similarly, synthesis of the transcriptional activator GAMYB is unaffected by the presence of cPrG in GA-treated cells." @default.
- W1514570914 created "2016-06-24" @default.
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- W1514570914 date "2003-06-11" @default.
- W1514570914 modified "2023-10-15" @default.
- W1514570914 title "cPrG-HCl a potential H<sup>+</sup>/Cl<sup>−</sup>symporter prevents acidification of storage vacuoles in aleurone cells and inhibits GA-dependent hydrolysis of storage protein and phytate" @default.
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- W1514570914 doi "https://doi.org/10.1046/j.1365-313x.2003.01789.x" @default.
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