Functional consequences of modification of the photosystem I/photosystem II ratio in the cyanobacterium sp. PCC 6803.

Unlabelled: The stoichiometry of photosystem II (PSII) and photosystem I (PSI) varies between photoautotrophic organisms. The cyanobacterium sp. PCC 6803 maintains two- to fivefold more PSI than PSII reaction center complexes, and we sought to modify this stoichiometry by changing the promoter region of the operon.