The blue oxidases, ascorbate oxidase, laccase and ceruloplasmin Modelling and structural relationships

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<jats:p>On the basis of the spatial structure of ascorbate oxidase [Messerschmidt, A., Rossi, A., Ladenstein, R., Huber, R., Bolognesi, M., Gatti, G., Marchesini, A., Petruzzelli, R. & Finazzi‐Agro, A. (1989) <jats:italic>J. Mol. Biol. 206</jats:italic>, 513–529], an alignment of the amino acid sequence of the related blue oxidases, laccase and ceruloplasmin is proposed. This strongly suggests a three‐domain structure for laccase closely related to ascorbate oxidase and a six‐domain structure of ceruloplasmin. These domains demonstrate homology with the small blue copper proteins. The relationships suggest that laccase, like ascorbate oxidase, has a mononuclear blue copper in domain 3 and a trinuclear copper between domain 1 and 3 and ceruloplasmin has mononuclear copper ions in domains 2, 4 and 6 and a trinuclear copper between domains 1 and 6.</jats:p>

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