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Absorption and circular dichroism spectra of CuCl2 complexed with poly(S-carboxymethyl-L-cysteine) and poly(S-carboxyethyl-L-cysteine)

✍ Scribed by Hiroshi Maeda; Kazuki Oka; Shoichi Ikeda

Publisher
Wiley (John Wiley & Sons)
Year
1985
Tongue
English
Weight
681 KB
Volume
24
Category
Article
ISSN
0006-3525

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✦ Synopsis

The interaction of CuC1, with poly(Scarboxymethy1-L-cysteine) (poly[Cys(CH,COOH)]) and poly(Scarboxyethy1-L-cysteine) (poly[Cys(CzH,COOH)]) were studied by absorption spectra and circular dichroism (CD). On mixing CuClz with polypeptide solutions, absorption bands appeared at 32C-325 nm in both polypeptides, and at 255-260 nm in the case of poly[Cys(CH,COOH)]. A stable bound species was formed in the case of poly[Cys(CH,COOH)], since the apparent molar absorption coefficient of the bound species did not depend on the mixing ratio. From the absorption data, it was inferred that Cu2+ ions were complexed with the side chains, most probably with sulfur atoms and carboxyl groups. Induced optical activities were observed for the two polypeptides. The CD spectra of poly[Cys(CH,COOH)] + CuCl, gave simpler aspects than those of poly[Cys(C,H,COOH)] + CuC1,.

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