Triplet states in the reaction center of Photosystem II.

ABSTRACT: In oxygenic photosynthesis sunlight is harvested and funneled as excitation energy into the reaction center (RC) of Photosystem II (PSII), the site of primary charge separation that initiates the photosynthetic electron transfer chain. The chlorophyll Chl_D1 pigment of the RC is the primary electron donor, forming a charge-separated radical pair with the vicinal pheophytin Pheo_D1 (Chl_D1⁺Pheo_D1^-). To avert charge recombination, the electron is further transferred to plastoquinone Q_A, whereas the hole relaxes to a central pair of chlorophylls (P_D1P_D2), subsequently driving water oxidation. Spin-triplet states can form within the RC when forward electron transfer is inhibited or back reactions ar

SUBMITTER: Bhattacharjee S 

PROVIDER: S-EPMC10498673 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature