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Title: Properties of cobalt-substituted bovine serum amine oxidase. Author: Agostinelli E, Morpurgo L, Wang C, Giartosio A, Mondovì B. Journal: Eur J Biochem; 1994 Jun 15; 222(3):727-32. PubMed ID: 8026486. Abstract: Half-copper-depleted and fully copper-depleted amine oxidase from bovine serum were reconstituted with either copper or cobalt. All samples were studied by high-sensitivity scanning calorimetry, by enzyme activity analysis, and by reactivity with phenylhydrazine. The calorimetric profile of the protein was strongly modified by the removal of a single Cu ion approximately to the same extent as by complete copper removal, in agreement with the loss of over 80% enzymic activity. The thermograms of metal-reconstituted species showed a marked similarity with that of the native enzyme, irrespective of whether copper or cobalt was present. Reactivity with phenylhydrazine and enzymic activity measurements showed that in cobalt-substituted amine oxidase the organic cofactor was reactive and the enzyme was catalytically competent, although kinetically less efficient. These observations agree both with previous findings on the protein half-site reactivity and with previous suggestions for a copper conformational role in bovine serum amine oxidase, namely of maintaining a functional conformation at the active site.[Abstract] [Full Text] [Related] [New Search]