Аннотация:The pigment-protein complex of photosystem II localized in the thylakoid membranes of higher plants, algae, and cyanobacteria is the main source of oxygen on Earth. The light-induced functioning of photosystem II is directly linked to electron and proton transfer across the membrane, which results in
the formation of transmembrane electric potential difference (ΔΨ). In this review, we describe the electrogenic reactions related to charge transfer on the donor side of photosystem II complexes which expand current understanding of the nature and mechanisms of vectorial processes and provide a necessary step in development of efficient systems of transformation of solar energy.