In vivo copper- and cadmium-binding ability of mammalian metallothionein domain |
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Authors: | Cols Neus; Romero-Isart Nuria; Bofill Roger; Capdevila Merce; Gonzalez-Duarte Pilar; Gonzalez-Duarte Roser; Atrian Silvia |
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Affiliation: | Departament de Genètica, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 645, 08071-Barcelona, Spain and
1 Departament de Química, Universitat Autònoma de Barcelona, 08193-Bellaterra, Barcelona, Spain |
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Abstract: | The ß domain of mouse metallothionein 1 (ßMT) wassynthesized in Escherichia coli cells grown in the presenceof copper or cadmium. Homogenous preparations of CußMTand CdßMT were used to characterize the correspondingin vivo-conformed metal-clusters, and to compare them with thespecies obtained in vitro by metal replacement to a canonicalZn3ßMT structure. The copper-containing ßMTclusters formed inside the cells were very stable. In contrast,the nascent ß peptide, although it showed cadmium bindingability, produced a highly unstable species, whose stoichiometrydepended upon culture conditions. The absence of ßMT proteinin E.coli protease-proficient hosts grown in cadmium-supplementedmedium pointed to drastic proteolysis of a poorly folded ßpeptide, somehow enhanced by the presence of cadmium. Possiblefunctional and evolutionary implications of the bioactivityof mammalian ßMT in the presence of monovalent and divalentmetal ions are discussed. |
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Keywords: | ß domain/ in vivo copper binding/ in vivo cadmium binding/ metallothionein/ recombinant expression |
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