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• W2014696058 abstract "Plasma membranes can be isolated from a variety of plant tissues by first preparing a post-mitochondrial membrane fraction enriched in plasma membranes, by differential centrifugation, and partitioning this on a dextran-polyethylene glycol two-phase system. With wild oat aleurone, however, we observed that differential centrifugation could not be used to produce a microsomal fraction enriched in plasma membrane. Approximately 70% of the plasma membrane in aleurone homogenates was pelleted by sequential centrifugation at 100 g× 10 min and 1000 g× 10 min. The remainder sedimented at 112 000 g× 1 h. All the material that was pelletable by centrifugation was, therefore, subjected to dextran-polyethylene glycol two-phase partitioning. The plasma membrane marker enzymes glucan synthase II (GSII, EC 2. 4. 1. 34) and UDP-glucose:sterol glucosyltransferase (SGT, EC 2. 4. 1.) were enriched in the upper phase, whereas cytochrome c oxidase activity (EC 1. 9. 3. 1), a mitochondrial marker enzyme, was depleted. The presence of endoplasmic reticulum (ER) and protein body membranes in the phase system was assessed by probing western blots, of SDS-PAGE separated proteins, with polyclonal antiserum either to binding protein (BiP, an ER marker) or to tonoplast intrinsic protein (TIP, a protein body membrane marker). BiP and TIP were present in the lower phase, but were not detected in the upper phase. In addition, the polypeptide patterns of material in the upper and lower phases were very different. These observations suggested that high purity aleurone plasma membrane had been isolated. Although the procedure for isolating plasma membranes was applicable to both aleurone protoplasts and layers, the polypeptide patterns of plasma membranes prepared from these sources were very different. The major protein components of wild oat aleurone were 7 S and 12 S storage globulins. These proteins were present in the lower phase, but not in the plasma membrane enriched upper phase, after aqueous two-phase partitioning. Differential centrifugation studies showed that it was necessary to homogenise aleurone in a buffer of pH 6. 0 or less if a soluble protein fraction, essentially devoid of storage globulins, was to be obtained. The use of these fractionation techniques is discussed in relation to photoaffinity labelling of gibberellin (GA)-binding proteins in aleurone." @default.
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• W2014696058 date "1993-10-01" @default.
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• W2014696058 title "Preparation and polypeptide composition of plasma membrane and other subcellular fractions from wild oat (Avena fatua) aleurone" @default.
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• W2014696058 doi "https://doi.org/10.1111/j.1399-3054.1993.tb00171.x" @default.
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