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Phylloquinone is the principal Mehler reaction site within photosystem I in high lightстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kozuleva Marina, Petrova Anastasia, Milrad Yuval, Semenov Alexey, Ivanov Boris, Redding Kevin E., Yacoby Iftach
- Журнал: Plant Physiology
- Год издания: 2021
- Издательство: American Society of Plant Biologists
- Местоположение издательства: United States
- DOI: 10.1093/plphys/kiab221
- Аннотация: Photosynthesis is a vital process, responsible for fixing carbon dioxide, and producing most of the organic matter on the planet. However, photosynthesis has some inherent limitations in utilizing solar energy, and a part of the energy absorbed is lost in the reduction of O2 to produce the superoxide radical (O2-) reduction within PSI was assumed to take place solely in the distal iron-sulfur clusters rather than within the two asymmetrical cofactor branches. Here we demonstrate that under high irradiance, O2 photoreduction by PSI primarily takes place at the phylloquinone of one of the branches (the A-branch). This conclusion derives from the light dependency of the O2 photoreduction rate constant in fully mature wild type PSI from Chlamydomonas reinhardtii, complexes lacking iron-sulfur clusters, and a mutant PSI, in which phyllosemiquinone at the A-branch has a significantly longer lifetime. We suggest that the Mehler reaction at the phylloquinone site serves as a release valve under conditions where both the iron-sulfur clusters of PSI and the mobile ferredoxin pool are highly reduced.
- Добавил в систему: Петрова Анастасия Александровна