Microscopic basis of reaction center modulation in PsbA variants of photosystem II.

ABSTRACT: Photosystem II (PSII) is a protein-pigment complex that utilizes sunlight to catalyze water oxidation and plastoquinone reduction, initiating the electron transfer (ET) cascade in oxygenic photosynthesis. The D1 and D2 proteins are the most important transmembrane subunits of PSII that bind all redox-active components involved in primary charge separation (CS) and ET. D1 is susceptible to oxidative photodamage, particularly under high light, and protection partly involves genetic regulation. Cyanobacterial D1 is encoded by the psbA gene family that expresses distinct isoforms (PsbA1-3) depending on environmental conditions. Most differences in D1 isoforms are close to the active-branch reaction center (RC) pigments P_D1, P_D2, Chl_D1, and Pheo_D1

SUBMITTER: Bhattacharjee S 

PROVIDER: S-EPMC12107152 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature