title: Primary electron transfer processes in photosynthetic reaction centers from oxygenic organisms.
abstract: This minireview is written in honor of Vladimir A. Shuvalov, a pioneer in the area of primary photochemistry of both oxygenic and anoxygenic photosyntheses (See a News Report: Allakhverdiev et al. 2014). In the present paper, we describe the current state of the formation of the primary and secondary ion-radical pairs within photosystems (PS) II and I in oxygenic organisms. Spectral-kinetic studies of primary events in PS II and PS I, upon excitation by ~20 fs laser pulses, are now available and reviewed here; for PS II, excitation was centered at 710 nm, and for PS I, it was at 720 nm. In PS I, conditions were chosen to maximally increase the relative contribution of the direct excitation of the reaction center (RC) in order to separate the kinetics of the primary steps of charge separation in the RC from that of the excitation energy transfer in the antenna. Our results suggest that the sequence of the primary electron transfer reactions is P680 → ChlD1 → PheD1 → QA (PS II) and P700 → A 0A/A 0B → A 1A/A 1B (PS I). However, alternate routes of charge separation in PS II, under different excitation conditions, are not ruled out.
authors: A.N. Belozersky Institute of Physical-Chemical Biology, Moscow State University, 119991, Moscow, Russia, mahirmamedov@yandex.ru.
authors: Mahir
authors: M
authors: Mamedov
authors: Govindjee
authors: Victor
authors: V
authors: Nadtochenko
authors: Alexey
authors: A
authors: Semenov
mesh_terms: D004579:Electron Transport; D004735:Energy Transfer; D007700:Kinetics; D008961:Models, Structural; D010100:Oxygen / Q000378:metabolism; D010777:Photochemistry; D010788:Photosynthesis; D045331:Photosystem I Protein Complex / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000378:metabolism*
chemical_list: D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D010100:Oxygen
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