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• W1991796180 abstract "Glucoamylase and α-amylase are present in callus and suspension cultures of sugar beets (Beta vulgaris L.) as well as in mature roots. The subcellular localization of glucoamylase differed in callus and suspension-cultured cells: in callus, glucoamylase was present together with α-amylase in the soluble fraction of cells, but in suspension cultures, it was present predominantly in the extracellular fraction while most of the α-amylase activity remained in cells. Glucoamylase activity was considerably lower in callus protoplasts relative to the activities of α-mannosidase and α-galactosidase and the suspension of callus in Murashige-Skoog liquid medium or in mannitol by brief agitation resulted in the release of glucoamylase to the medium. These findings suggest that glucoamylase in callus may be present in a soluble form in the free space in the cell wall. Both mature roots and callus contained α-amylase and glucoamylase in the soluble fraction. Glucoamylases in the soluble fraction of callus and in the medium of suspension cultures were purified separately to homogeneity by the same four-step purification procedure, which included fractionation with ammonium sulfate, column chromatography on carboxymethyl cellulose, gel filtration on Bio-Gel P-150, and preparative disc electrophoresis. The identity of the glucoamylases from the two sources was confirmed by a comparison of chromatographic behavior during purification, mobility during gel electrophoresis, M r (83,000 D by SDS PAGE), and enzymic and kinetic properties of the catalytic reaction, such as optimal pH and temperature, heat stability, and K m value for soluble starch. Glucoamylase from suspension cultures was one of the major proteins that were secreted into the medium. Dedifferentiation of leaves of young plants to callus was accompanied by induction of glucoamylase and repression of some α-amylases and the debranching enzyme." @default.
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• W1991796180 date "1988-09-01" @default.
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• W1991796180 title "Purification and Properties of Glucoamylase from Sugar Beet Cells in Suspension Culture" @default.
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• W1991796180 doi "https://doi.org/10.1104/pp.88.1.172" @default.
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