|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Hybrid coupling of R-phycoerythrin and the orange carotenoid protein supports the FRET-based mechanism of cyanobacterial photoprotectionстатья
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: 15 августа 2019 г.
- Авторы: Maksimov Eugene G., Wen-Jun Li, Protasova Elena A., Thomas Friedrich, Baosheng Ge, Song Qin, Sluchanko Nikolai N.
- Журнал: Biochemical and Biophysical Research Communications
- Номер: 516
- Год издания: 2019
- Издательство: Academic Press
- Местоположение издательства: United States
- Первая страница: 699
- Последняя страница: 704
- DOI: 10.1016/j.bbrc.2019.06.098
- Аннотация: To regulate the effectiveness of photosynthesis and photoprotection cyanobacteria utilize a system consisting of only few components. Photoactivation of the orange carotenoid protein (OCP) enables its interaction with a specific, yet controversial site in the core of the light-harvesting antenna, the phycobilisome (PBS). The resulting delivery of a quenching carotenoid molecule to the antenna pigments leads to thermal dissipation of the excitation energy absorbed by the latter, and, consequently, to depression of the photosynthetic activity. The nature of the OCP-induced PBS fluorescence quenching mechanism remains debatable, however, specific protein-protein interactions between PBS and photoactivated OCP should provide a unique environment for interactions between the excitation energy donor and acceptor. Here we questioned whether the F€orster theory of resonance energy transfer can explain PBS quenching by OCP even at their very small spectral overlap and whether in model systems, the absence of specific protein-protein interactions of OCP with a donor of energy can be compensated by a better spectral overlap. Hybridization of algal R-phycoerythrin with cyanobacterial OCP by chemical crosslinking results in a significant decrease of R-phycoerythrin fluorescence lifetime, irrespective of the OCP photoactivation status. Supported by structural considerations, this indicates that FRET may be the essence of cyanobacterial photoprotection mechanism.
- Добавил в систему: Максимов Евгений Георгиевич