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To point out the metalloprotein structure of bovine liver plasma membrane 5'-nucleotidase, we studied the inhibition mechanism of the purified enzyme by EDTA: this apparently non-competitive inhibition seems to be dependent on EDTA concentration, pH, temperature and incubation time. When the restoration of activity was assayed by addition of divalent cations or by gel filtration, the inhibition became progressively irreversible with time. Incubation of the enzyme with [14C]EDTA allowed us to observe, after gel filtration as well as after sucrose gradient ultracentrifugation, that the chelating agent is bound to 5'-nucleotidase.
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