Formation of the poly(Lys-Ala-Ala) complex with pectin of various esterification degree
| Autor: | Slavomír Bystrický, Rudolf Kohn, Tibor Sticzay, Karel Bláha |
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| Rok vydání: | 1986 |
| Předmět: | |
| Zdroj: | Collection of Czechoslovak Chemical Communications. 51:1772-1780 |
| ISSN: | 1212-6950 0010-0765 |
| Popis: | The helix-forming interaction of poly(Lys-Ala-Ala) with potassium pectinates of various esterification degree (E 0-87%) was quantitatively investigated by circular dichroism spectra. The helix-forming effect of pectinates is significant even at a low density of carboxyl anions in the molecule at a high esterification degree. The mutual complementarity of linear charge density of both interacting polyions plays a decisive role. The charge densities of unesterified pectate and helical poly(Lys-Ala-Ala) are very close. Orientation of the potassium pectate macromolecule (E0%) in the proposed spatial model is parallel to the axis of poly(Lys-Ala-Ala) α-helix. Saturation of the polypeptide charge with pectinates of an esterification degree E > 0% is achieved through formation of a superhelical structure of the pectinate with a turn density corresponding to the equivalence of charge densities of both interacting components in the complex. |
| Databáze: | OpenAIRE |
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