Activities and some properties of 5′nucleotidase in isolated hamster fat cells

https://doi.org/10.1016/0305-0491(85)90021-5Get rights and content

Abstract

  • 1.

    1. Kinetic parameters and the possible cellular location of 5′nucleotidase were studied in isolated hamster fat cells.

  • 2.

    2. Measurements of the enzyme were performed using 5′IMP instead of 5′AMP as substrate.

  • 3.

    3. The apparent Vmax and Km values obtained support the view that two forms of 5′nucleotidase, having different affinities, are present in hamster fat cells. The major form was located in the outer surface of plasma membrane and the other one inside the cell.

  • 4.

    4. The effects of ADP, adenosine and inosine on the enzyme were studied. ADP and adenosine were competitive inhibitors. The enzyme was not modified by inosine.

References (34)

  • R. Itoh

    Regulation of cytosol 5′nucleotidase by adenylate energy charge

    Biochim. biophys. Acta

    (1981)
  • C. Rosak et al.

    Characterization of lipolytic responses of isolated white adipocytes from hamster

    Biochim. biophys. Acta

    (1977)
  • R. Rubio et al.

    Relationship between coronary flow and adenosine production and release

    J. Molec. Cell. Cardiol.

    (1974)
  • E.G. Trams et al.

    On the sidedness of plasma membrane enzymes

    Biochim. biophys. Acta

    (1974)
  • J.R.S. Arch et al.

    The control of the metabolism and the hormonal role of adenosine

    Essays in Biochemistry

    (1979)
  • K.E. Blass et al.

    The influence of adenosine and prostaglandins on regulating processes of cardiac flow: investigations in vitro and in vivo

    Acta biol. med. germ.

    (1976)
  • K. Burton

    A study of the conditions and mechanism of diphenylamine reaction for the colorimetric estimation of deoxyribonucleic acid

    Biochem. J.

    (1955)
  • Cited by (2)

    • Cyclic AMP metabolism by swine adipocyte microsomal and plasma membranes

      1999, Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
    View full text