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- W2024892298 abstract "Studies were conducted to determine whether protein phosphorylation may be a mechanism for regulation of spinach (Spinacia oleracea L.) leaf sucrose-phosphate synthase (SPS), shown previously to be light-dark regulated by some type of covalent modification. Radioactive phosphate was incorporated into the 120-kDa subunit of SPS during labeling of excised leaves with [32P]Pi, as shown by immunoprecipitation and denaturing gel electrophoresis of the enzyme. Conditions which activated the enzyme (illumination of leaves or mannose treatment of leaf discs in darkness) reduced the incorporation of radiolabel into SPS in the in vivo system. The partially purified SPS protein could also be phosphorylated in vitro using [γ-32P]ATP. In the in vitro system, the incorporation of radiolabel into the 120-kDa subunit of SPS was dependent on time and magnesium concentration, and was closely paralleled by inactivation of the enzyme. These results provide the first evidence to establish protein phosphorylation as a mechanism for the covalent regulation of SPS activity." @default.
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- W2024892298 date "1989-05-01" @default.
- W2024892298 modified "2023-10-02" @default.
- W2024892298 title "Protein phosphorylation as a mechanism for regulation of spinach leaf sucrose-phosphate synthase activity" @default.
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- W2024892298 doi "https://doi.org/10.1016/0003-9861(89)90551-1" @default.
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