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Complexes of cobalt (II) and manganese (II) with adenosine 5′-diphosphate and adenosine 5′-triphosphate. A circular dichroism study

✍ Scribed by Jacques Bolard; Genevieve Chottard

Publisher: Elsevier Science
Year: 1978
Weight: 664 KB
Volume: 8
Category: Article
ISSN: 0006-3061
DOI: 10.1016/s0006-3061(00)80195-7

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✦ Synopsis

The volume changes, AV. produced by the formation of two types of 1:l Cu(Ii)rdipeptide complexes were determined dilatometrically. A volume increase of about 11 ml/mole results from the formation of one category of complex in which the Cu(II) is chelated to the terminal amino and carbonyl oxygen of the peptide. A AV of about 20 ml/mole results when a tridentated chelate is formed by the coordination of Cu(II) to the terminal amine, the peptide nitrogen and the carboxylate oxygen of the dipeptide; during this process a proton is expelled from the peptide backbone. These volume parameters exhibit a small dependence on the type and location of nonpolar radicals incorporated in the dipeptide. The values for the protonation of the amine radical or of dipeptides exhibited a small dependence on structure, -3.2

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