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Specificity in the interaction between poly(L-glutamate) and iron (III) complex ions in aqueous solution

✍ Scribed by M. Branca; M. E. Marini; B. Pispisa

Publisher
Wiley (John Wiley & Sons)
Year
1976
Tongue
English
Weight
421 KB
Volume
15
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The binding process between sodium poly(L‐glutamate) and trans‐2,2′,2″,2‴‐tetrapyridyl‐Fe(III) complex ions in aqueous solution at pH around 7 has been studied by means of equilibrium dialysis and optical measurements. The binding isotherm indicates the occurrence of a cooperative process, whereby bound molecules facilitate the association of additional molecules. According to circular dichroism (CD) data, this effect is coupled with that which sees a conformational change in the charged polypeptide upon progessive binding of complex counterions. All these features are discussed in the light of the structural characteristics of the interacting species. A stereochemical model of the association “complex” is proposed.

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