Structural insights into the action mechanisms of artificial electron acceptors in photosystem II.

ABSTRACT: Photosystem II (PSII) utilizes light energy to split water, and the electrons extracted from water are transferred to Q_B, a plastoquinone molecule bound to the D1 subunit of PSII. Many artificial electron acceptors (AEAs) with molecular structures similar to that of plastoquinone can accept electrons from PSII. However, the molecular mechanism by which AEAs act on PSII is unclear. Here, we solved the crystal structure of PSII treated with three different AEAs, 2,5-dibromo-1,4-benzoquinone, 2,6-dichloro-1,4-benzoquinone, and 2-phenyl-1,4-benzoquinone, at 1.95 to 2.10 Å resolution. Our results show that all AEAs substitute for Q_B and are bound to the Q_B-binding site (Q_B site) to receive electrons, but their binding strengths are different, resultin

SUBMITTER: Kamada S 

PROVIDER: S-EPMC10300377 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature