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Evidence for the presence of rat liver glucokinase in the nucleus as well in the cytoplasm


, : Evidence for the presence of rat liver glucokinase in the nucleus as well in the cytoplasm. Biochemistry International 22(4): 759-768

Subcellular distribution of glucokinase was studied in rat liver. With an immunohistochemical procedure, glucokinase immunoreactivity was clearly shown in the nucleus of parenchymal cells of rat liver, but faintly in the cytoplasm. Nuclei, cytosol (extranuclear fraction in the strict sense), and homogenate prepared in nonaqueous medium, i.e. glycerol, were analyzed for glucokinase by both immunoblotting and activity measurement. Such analyses demonstrated that glucokinase concentration was far higher in the nuclei than in the cytosol when compared on the basis of total protein content and that total glucokinase activity in the cytosolic fraction was about 1.8 times that in the nuclear fraction. These results indicate that hepatocyte glucokinase is present in the nucleus as well as in the cytoplasm in contradiction to the widespread brief of its exclusive localization in the cytoplasm.

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PMID: 2078199


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