Title : Oxidative inactivation of brain ecto-5'-nucleotidase by thiols/Fe2+ system.

Pub. Date : 2000 Nov

PMID : 11071366






7 Functional Relationships(s)
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1 Oxidative inactivation of brain ecto-5"-nucleotidase by thiols/Fe2+ system. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
2 The 5"-nucleotidase activity decreased slightly after the exposure to either glutathione or Fe2+. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
3 The glutathione-mediated inactivation of 5"-nucleotidase was potentiated remarkably by Fe2+, but not Cu2+, in a concentration-dependent manner. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
4 Overall, thiols, expressing more inhibitory effect on the activity of 5"-nucleotidase, were found to be more effective in potentiating the Fe2+-mediated inactivation. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
5 Further, kinetic analyses indicate that Fe2+ and thiols inhibit the 5"-nucleotidase in a competitive or uncompetitive manner, respectively. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
6 These results suggest that ecto-5"-nucleotidase from brain membrane is one of proteins susceptible to thiols/Fe2+-catalyzed oxidation, and the oxidative inactivation may be related to the selective association of Fe2+ and thiols to the enzyme molecule. ammonium ferrous sulfate 5'-nucleotidase Bos taurus
7 These results suggest that ecto-5"-nucleotidase from brain membrane is one of proteins susceptible to thiols/Fe2+-catalyzed oxidation, and the oxidative inactivation may be related to the selective association of Fe2+ and thiols to the enzyme molecule. ammonium ferrous sulfate 5'-nucleotidase Bos taurus