|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Electrogenic proton transport across lipid bilayer membranes mediated by cationic derivatives of rhodamine 19: comparison with anionic protonophoresстатья
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: 25 декабря 2013 г.
- Авторы: Rokitskaya Tatyana I., Ilyasova Tatyana M., Severina Inna I., Antonenko Yuri N., Skulachev Vladimir P.
- Журнал: European Biophysics Journal
- Том: 42
- Номер: 6
- Год издания: 2013
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 477
- Последняя страница: 485
- DOI: 10.1007/s00249-013-0898-9
- Аннотация: Protonophores can be considered as candidates for anti-obesity drugs and tools to prevent excessive reactive oxygen species production in mitochondria by means of a limited decrease in the mitochondrial potential. Experimentally used protonophores are weak acids that can carry protons across a membrane in a neutral (protonated) form, and they come back in an anionic (deprotonated) form. A cationic derivative of rhodamine 19 and plastoquinone (SkQR1) was recently shown to possess uncoupling activity in mitochondria and in intact cells. In this article, we studied the mechanism of action of SkQR1 and its plastoquinone-lacking analog (C(12)R1) on a planar bilayer lipid membrane by applying voltage jumps. The steady-state current was proportional to the C(12)R1 concentration in a manner as if the monomeric form of the carrier were operative. As predicted by the carrier model, at high pH, when rhodamines were mainly deprotonated, the current changed immediately following a jump in the applied potential and then remained constant. By contrast, at low pH, the current relaxed from an initially high value to a lower value since the protonated carrier cations were redistributed in the membrane. An inverse pH dependence was revealed with the anionic protonophore CCCP. The dependence of the SkQR1 protonophorous activity on voltage exhibited an increase at high voltages, an effect that might facilitate mild (self-limited) uncoupling of mitochondria.
- Добавил в систему: Рокицкая Татьяна Ивановна