Structural evidence for intermediates during O₂ formation in photosystem II.

ABSTRACT: In natural photosynthesis, the light-driven splitting of water into electrons, protons and molecular oxygen forms the first step of the solar-to-chemical energy conversion process. The reaction takes place in photosystem II, where the Mn₄CaO₅ cluster first stores four oxidizing equivalents, the S₀ to S₄ intermediate states in the Kok cycle, sequentially generated by photochemical charge separations in the reaction center and then catalyzes the O-O bond formation chemistry^1-3. Here, we report room temperature snapshots by serial femtosecond X-ray crystallography to provide structural insights into the final reaction step of Kok's photosynthetic water oxidation cycle, the S₃→[S₄]→S₀ transition where O

SUBMITTER: Bhowmick A 

PROVIDER: S-EPMC10191843 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature