The Roles of Cytochrome b 559 in Assembly and Photoprotection of Photosystem II Revealed by Site-Directed Mutagenesis Studies

Frontiers in Plant Science
Hsiu-An Chu, Yi-Fang Chiu

Abstract

Cytochrome b 559 (Cyt b 559) is one of the essential components of the Photosystem II reaction center (PSII). Despite recent accomplishments in understanding the structure and function of PSII, the exact physiological function of Cyt b 559 remains unclear. Cyt b 559 is not involved in the primary electron transfer pathway in PSII but may participate in secondary electron transfer pathways that protect PSII against photoinhibition. Site-directed mutagenesis studies combined with spectroscopic and functional analysis have been used to characterize Cyt b 559 mutant strains and their mutant PSII complex in higher plants, green algae, and cyanobacteria. These integrated studies have provided important in vivo evidence for possible physiological roles of Cyt b 559 in the assembly and stability of PSII, protecting PSII against photoinhibition, and modulating photosynthetic light harvesting. This mini-review presents an overview of recent important progress in site-directed mutagenesis studies of Cyt b 559 and implications for revealing the physiological functions of Cyt b 559 in PSII.

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Feb 15, 2017·Proceedings of the National Academy of Sciences of the United States of America·Daniel A WeiszHimadri B Pakrasi
Aug 30, 2017·Journal of Computational Chemistry·Suliman AdamAna-Nicoleta Bondar
Jul 31, 2019·Proceedings of the National Academy of Sciences of the United States of America·José G García-CerdánKrishna K Niyogi
May 24, 2018·Photosynthesis Research·Daisuke TakagiChikahiro Miyake
Jan 19, 2019·Environmental Science & Technology·Lijuan ZhaoRong Ji

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