Unequal misses during the flash-induced advancement of photosystem II: effects of the S state and acceptor side cycles.

ABSTRACT: Photosynthetic water oxidation is catalyzed by the oxygen-evolving complex (OEC) in photosystem II (PSII). This process is energetically driven by light-induced charge separation in the reaction center of PSII, which leads to a stepwise accumulation of oxidizing equivalents in the OEC (S_i states, i = 0-4) resulting in O₂ evolution after each fourth flash, and to the reduction of plastoquinone to plastoquinol on the acceptor side of PSII. However, the S_i-state advancement is not perfect, which according to the Kok model is described by miss-hits (misses). These may be caused by redox equilibria or kinetic limitations on the donor (OEC) or the acceptor side. In this study, we investigate the effects of individual S state transitions and of the quinone accepto

SUBMITTER: Pham LV 

PROVIDER: S-EPMC6373315 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature