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- W1993882178 abstract "Phosphorylation of polypeptides in membrane fractions from barley (Hordeum vulgare L. cv CM 72) roots was compared in in vitro and in vivo assays to assess the potential role of protein kinases in modification of membrane transport. Membrane fractions enriched in endoplasmic reticulum, tonoplast, and plasma membrane were isolated using sucrose gradients and the membrane polypeptides separated using sodium dodecyl sulfate polyacrylamide gel electrophoresis. When the membrane fractions were incubated with γ-[32P]ATP, phosphorylation occurred almost exclusively in the plasma membrane fraction. Phosphorylation of a band at 38 kilodaltons increased as the concentration of Mg2+ was decreased from millimolar to micromolar levels. Phosphorylation of bands at 125, 86, 58, 46, and 28 kilodaltons required millimolar Mg2+ concentrations and was greatly enhanced by Ca2+. When roots of intact plants were labeled with [32P]orthophosphate, polypeptides at approximately 135, 116, 90, 46 to 53, 32, 28, and 19 kilodaltons were labeled in the plasma membrane fraction and polypeptides at approximately 73, 66, and 48 kilodaltons were labeled in the tonoplast fraction. Treatment of the roots of intact plants with 150 millimolar NaCl resulted in increased phosphorylation of some polypeptides while treatment with 100 mm NaCl had no effect." @default.
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- W1993882178 date "1991-04-01" @default.
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- W1993882178 title "In Vitro and in Vivo Phosphorylation of Polypeptides in Plasma Membrane and Tonoplast-Enriched Fractions from Barley Roots" @default.
- W1993882178 doi "https://doi.org/10.1104/pp.95.4.1219" @default.
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