Two distinct photoprocesses in cyanobacterial bilin pigments: energy migration in light-harvesting phycobiliproteins versus photoisomerization in phytochromesстатья
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Дата последнего поиска статьи во внешних источниках: 10 февраля 2021 г.
Аннотация:Invited Review:
The evolution of oxygenic photosynthesis, respiration, and photoperception are connected with the appearance of cyanobacteria. The key compounds, which are involved in these processes, are tetrapyrroles – cyclic chlorophylls, heme and open‐chain bilins. The latter are characterized by their covalent bond with the apoprotein resulting in the formation of biliproteins. This type of photoreceptors is unique in that it can perform important and opposite functions – light harvesting in photosynthesis with the participation of phycobiliproteins and photoperception mediated by phycochromes and phytochromes. In this review, cyanobacterial phycobiliproteins and phytochrome Cph1 are considered from a comparative point of view. Structural features of these pigments, which provide their contrasting photophysical and photochemical characteristics, are analyzed. The determining factor in the case of energy migration with the participation of phycobiliproteins is blocking the torsional relaxations of the chromophore, its D‐ring, in the excited state and their freedom, in the case of phytochrome photoisomerization. From the energetics point of view, this distinction is preconditioned by the height of its activation barrier, which depends on the degree of the chromophore fixation by its protein surroundings.