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Histidine 440 controls the opening of colicin E1 channels in a lipid-dependent mannerстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Sobko Alexander A., Rokitskaya Tatyana I., Kotova Elena A.
- Журнал: Biochimica et Biophysica Acta - Biomembranes
- Том: 1788
- Номер: 9
- Год издания: 2009
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 1962
- Последняя страница: 1966
- DOI: 10.1016/j.bbamem.2009.06.017
- Аннотация: The in vitro activity of many pore-forming toxins, in particular, the rate of increase in the membrane conductance induced by the channel-forming domain (P178) of colicin E1 is maximum at an acidic pH. However, after P178 binding at acidic conditions, a subsequent pH shift from 4 to 6 on both sides of the planar bilayer lipid membrane caused a large increase in the trans-membrane current which was solely due to an increase in the number of open channels. This effect required the presence of anionic lipid. Replacing the His440 residue of P178 by alanine eliminated the pH-shift effect thereby showing that it is associated with deprotonation of this histidine residue. It was concluded that alkalinization-induced weakening of the electrostatic interactions between colicin and the membrane surface facilitates conformational changes required for the transition of membrane-bound colicin molecules to an active channel state. (c) 2009 Elsevier B.V. All rights reserved.
- Добавил в систему: Рокицкая Татьяна Ивановна