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• W176342255 abstract "A comprehensive study on circular dichroism of metallothioneins containing Zn, Cd and Cu was carried out. The contributions of the metals, the sulphur and the polypeptide chain to the observed Cotton effects was shown. From the pH dependency of the extrinsic Cotton effects which are due to the metal-thiolate chromophore the stability of the metal clusters was found to decrease in the order Cu >Cd >Zn. The pH values corresponding to the dissociation of half of the bound metal ions are 0.44 for Cu-thionein, 3.05 for Cd-thionein and 4.6 for Zn-thionein. The extrinsic Cotton effects of Cd, Zn-thioneins of varying Cd to Zn ratio could be simulated using the difference circular dichroic spectra of Cd-thionein (bands at 227, 242.5 and 262 nm), Zn-thionein (bands at 225 and 244 nm) and the circular dichroic spectrum of cysteine-thionein (band at 200 nm, shoulder at 225 nm). Since during the dissociation of the metals the circular dichroic spectra exhibited changes only in amplitude and not in shape we can conclude that the dissociation of the metal ions involves the complete sequential degradation of metal clusters. In the near-ultraviolet region the metal-free proteins show only Cotton effects attributable to a disulphide chromophore. Thus Cotton bands are observed for cystine-thionein at 282.5 and 260 nm. From the intrinsic circular dichroism of Cd- and Zn-thionein (negative Cotton effect at 200 nm, shoulder at 225 nm) it follows that the protein conformation consists of less than 5% helical or pleated sheet structure and therefore has to be classified as unordered structure of “fixed” random coil." @default.
• W176342255 created "2016-06-24" @default.
• W176342255 creator A5005618408 @default.
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• W176342255 date "1978-03-01" @default.
• W176342255 modified "2023-10-03" @default.
• W176342255 title "Circular dichroism of metallothioneins" @default.
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• W176342255 doi "https://doi.org/10.1016/0005-2795(78)90565-2" @default.
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