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- W1981342661 abstract "UDP-glucose: flavonol 2′- and 5′-O-glucosyltransferases (E.C.2.4.1.-) from leaves of Chrysosplenium americanum were copurified to apparent homogeneity by successive chromatography on Sephacryl S-200, UDP-glucuronic acid-agarose, Mono P, Superose 12, and Mono Q columns. Both enzymes have similar properties except for their substrate specificity and stability (J. Chromatogr. 388, 235, 1987). The purified protein was used as the source of antigen to produce polyclonal antibodies in rabbits. In situ localization of the O-glucosyltransferases was studied by applying a postembedding immunogold labeling technique on ultrathin sections of Lowicryl K4M- and LR White-embedded tissues. Postfixation with osmium tetroxide followed by embedding in LR White resulted in good preservation of membrane ultrastructure, although protein antigenicity was greatly reduced. Leaf sections embedded in Lowicryl K4M had an extracted appearance; however, they retained a high degree of protein antigenicity revealing the deposition of gold particles in the periplasmic region of cells. Considering the compromise chosen in this study to retain antigenicity over preservation of membrane ultrastructure, the results suggest that the “easily solubilized” O-glucosyltransferases of C. americanum may actually be associated with vesicle-like structures and cytoplasmic membranes." @default.
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- W1981342661 date "1991-08-01" @default.
- W1981342661 modified "2023-10-16" @default.
- W1981342661 title "Flavonol ring B-specific O-glucosyltransferases: Purification, production of polyclonal antibodies, and immunolocalization" @default.
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- W1981342661 doi "https://doi.org/10.1016/0003-9861(91)90466-v" @default.
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