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Structure and conformation of polypeptide-cationic surfactant complex in organic solventsстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Lezov A.V., Mel’nikov A.B., Polushina G.E., Ryumtsev E.I., Lysenko E.A., Zezin A.B., Kabanov V.A.
- Журнал: Vysokomolekularnye Soedineniya. Ser.A Ser.B Ser.C - Kratkie Soobshcheniya
- Том: 43
- Номер: 9
- Год издания: 2001
- Издательство: Russian Academy of Sciences
- Местоположение издательства: Russian Federation
- Первая страница: 1481
- Последняя страница: 1487
- Аннотация: Hydrodynamic, electrooptical, and conformational properties of stoichiometric polyelectrolyte complexes composed of poly(L-glutamic) acid and a cationic surfactant in chloroform and isopropyl and methyl alcohols were studied. In all these solvents, the molecules of the complex are individual compounds neither dissociating to separate components nor forming intermolecular associates. The optical rotation spectra of the solutions of the studied complex and its covalent analog, poly(γ-benzyl-α,L-glutamate), are characteristic of polypeptides occurring in the form of an α-helix. Comparison of the intrinsic viscosity η and the times of orientational relaxation τd of molecules shows that the hydrodynamic sizes of the complex molecules are markedly smaller than those of poly(γ-benzyl-α,L-glutamate) with the same degree of polymerization. A model is advanced according to which steric repulsion between bulky surfactant ions is responsible for the local disturbance of the secondary structure of the complex macromolecules; as a result, flexible fragments appear along with rigid helical regions. The presence of such fragments determines the compact convoluted conformation of the complex macromolecules in the examined solvents.
- Добавил в систему: Зезин Александр Борисович