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The redox state of plastoquinone pool regulates state transitions via cytochrome b 6 f complex in Synechocystis sp. PCC 6803
Author(s) -
Mao Hai-Bin,
Li Guo-Fu,
Ruan Xiang,
Wu Qing-Yu,
Gong Yan-Dao,
Zhang Xiu-Fang,
Zhao Nan-Ming
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)02715-1
Subject(s) - plastoquinone , chemistry , redox , photochemistry , cytochrome b6f complex , synechocystis , cytochrome , dcmu , benzoquinone , stereochemistry , photosynthesis , photosystem i , photosystem ii , biochemistry , chloroplast , inorganic chemistry , mutant , enzyme , thylakoid , gene
The effects of benzoquinone analogues, phenyl‐1,4‐benzoquinone (PBQ) and 2,5‐dibromo‐3‐methyl‐6‐isopropyl‐1,4‐benzoquinone (DBMIB), on state transitions in Synechocystis sp. PCC 6803 were investigated. PBQ induced a transition from state 2 to state 1 in the absence of actinic light whereas DBMIB caused a state 2 transition. 3‐(3,4‐Dichlorophenyl)‐1,1‐dimethyl urea could not eliminate the effects of PBQ and DBMIB. These results imply that the redox state of the plastoquinone pool controls the state transitions in vivo and cytochrome b 6 f complex is involved in this process. As a working hypothesis, we propose that the occupancy of the quinol oxidation site and the movement of the Rieske protein may be pivotal in this regulation.