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Specific adenosine binding proteins from rat liver.

H H Hsu, R M Archibald

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |July 1, 1975
    PubMed
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    Researchers identified specific adenosine-binding proteins in rat liver, fractionating them by their histone phosphokinase and cyclic adenosine monophosphate (cAMP) activities. Adenosine binding was primarily associated with Peak III, which also showed cAMP-stimulated enzyme activity.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Adenosine and its derivatives play crucial roles in cellular signaling and metabolism.
    • Understanding adenosine-binding proteins is key to elucidating cellular responses to adenosine.
    • Histone phosphokinases are enzymes involved in regulating gene expression through protein phosphorylation.

    Purpose of the Study:

    • To isolate and characterize specific adenosine-binding proteins from rat liver homogenates.
    • To investigate the relationship between adenosine-binding activity, histone phosphokinase activity, and cyclic adenosine monophosphate (cAMP) stimulation.
    • To determine the specificity of adenosine binding to these identified protein fractions.

    Main Methods:

    • Fractionation of rat liver homogenates using DEAE-cellulose chromatography.

    Related Experiment Videos

  • Assay of histone phosphokinase activity in eluted fractions.
  • Measurement of cyclic adenosine monophosphate (cAMP) binding and adenosine binding activities.

    • Main Results:

    • Three major protein peaks with distinct enzymatic and binding activities were identified.
    • Peak I exhibited histone phosphokinase activity independent of cAMP; Peak II showed slight cAMP stimulation.
    • Peak III contained the major adenosine-binding protein, with its associated histone phosphokinase activity stimulated by cAMP and inhibited by adenosine.

    Conclusions:

    • Rat liver contains distinct protein fractions with specific adenosine-binding and histone phosphokinase activities.
    • The major adenosine-binding protein fraction (Peak III) demonstrates cAMP-dependent modulation of histone phosphokinase activity.
    • Adenosine exhibits inhibitory effects across all identified enzyme peaks, suggesting a broader regulatory role.